diff options
Diffstat (limited to 'python/jinja2')
27 files changed, 12359 insertions, 0 deletions
diff --git a/python/jinja2/__init__.py b/python/jinja2/__init__.py new file mode 100644 index 0000000..15e13b6 --- /dev/null +++ b/python/jinja2/__init__.py @@ -0,0 +1,83 @@ +# -*- coding: utf-8 -*- +""" + jinja2 + ~~~~~~ + + Jinja2 is a template engine written in pure Python. It provides a + Django inspired non-XML syntax but supports inline expressions and + an optional sandboxed environment. + + Nutshell + -------- + + Here a small example of a Jinja2 template:: + + {% extends 'base.html' %} + {% block title %}Memberlist{% endblock %} + {% block content %} + <ul> + {% for user in users %} + <li><a href="{{ user.url }}">{{ user.username }}</a></li> + {% endfor %} + </ul> + {% endblock %} + + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +__docformat__ = 'restructuredtext en' +__version__ = '2.10.1' + +# high level interface +from jinja2.environment import Environment, Template + +# loaders +from jinja2.loaders import BaseLoader, FileSystemLoader, PackageLoader, \ + DictLoader, FunctionLoader, PrefixLoader, ChoiceLoader, \ + ModuleLoader + +# bytecode caches +from jinja2.bccache import BytecodeCache, FileSystemBytecodeCache, \ + MemcachedBytecodeCache + +# undefined types +from jinja2.runtime import Undefined, DebugUndefined, StrictUndefined, \ + make_logging_undefined + +# exceptions +from jinja2.exceptions import TemplateError, UndefinedError, \ + TemplateNotFound, TemplatesNotFound, TemplateSyntaxError, \ + TemplateAssertionError, TemplateRuntimeError + +# decorators and public utilities +from jinja2.filters import environmentfilter, contextfilter, \ + evalcontextfilter +from jinja2.utils import Markup, escape, clear_caches, \ + environmentfunction, evalcontextfunction, contextfunction, \ + is_undefined, select_autoescape + +__all__ = [ + 'Environment', 'Template', 'BaseLoader', 'FileSystemLoader', + 'PackageLoader', 'DictLoader', 'FunctionLoader', 'PrefixLoader', + 'ChoiceLoader', 'BytecodeCache', 'FileSystemBytecodeCache', + 'MemcachedBytecodeCache', 'Undefined', 'DebugUndefined', + 'StrictUndefined', 'TemplateError', 'UndefinedError', 'TemplateNotFound', + 'TemplatesNotFound', 'TemplateSyntaxError', 'TemplateAssertionError', + 'TemplateRuntimeError', + 'ModuleLoader', 'environmentfilter', 'contextfilter', 'Markup', 'escape', + 'environmentfunction', 'contextfunction', 'clear_caches', 'is_undefined', + 'evalcontextfilter', 'evalcontextfunction', 'make_logging_undefined', + 'select_autoescape', +] + + +def _patch_async(): + from jinja2.utils import have_async_gen + if have_async_gen: + from jinja2.asyncsupport import patch_all + patch_all() + + +_patch_async() +del _patch_async diff --git a/python/jinja2/_compat.py b/python/jinja2/_compat.py new file mode 100644 index 0000000..61d8530 --- /dev/null +++ b/python/jinja2/_compat.py @@ -0,0 +1,99 @@ +# -*- coding: utf-8 -*- +""" + jinja2._compat + ~~~~~~~~~~~~~~ + + Some py2/py3 compatibility support based on a stripped down + version of six so we don't have to depend on a specific version + of it. + + :copyright: Copyright 2013 by the Jinja team, see AUTHORS. + :license: BSD, see LICENSE for details. +""" +import sys + +PY2 = sys.version_info[0] == 2 +PYPY = hasattr(sys, 'pypy_translation_info') +_identity = lambda x: x + + +if not PY2: + unichr = chr + range_type = range + text_type = str + string_types = (str,) + integer_types = (int,) + + iterkeys = lambda d: iter(d.keys()) + itervalues = lambda d: iter(d.values()) + iteritems = lambda d: iter(d.items()) + + import pickle + from io import BytesIO, StringIO + NativeStringIO = StringIO + + def reraise(tp, value, tb=None): + if value.__traceback__ is not tb: + raise value.with_traceback(tb) + raise value + + ifilter = filter + imap = map + izip = zip + intern = sys.intern + + implements_iterator = _identity + implements_to_string = _identity + encode_filename = _identity + +else: + unichr = unichr + text_type = unicode + range_type = xrange + string_types = (str, unicode) + integer_types = (int, long) + + iterkeys = lambda d: d.iterkeys() + itervalues = lambda d: d.itervalues() + iteritems = lambda d: d.iteritems() + + import cPickle as pickle + from cStringIO import StringIO as BytesIO, StringIO + NativeStringIO = BytesIO + + exec('def reraise(tp, value, tb=None):\n raise tp, value, tb') + + from itertools import imap, izip, ifilter + intern = intern + + def implements_iterator(cls): + cls.next = cls.__next__ + del cls.__next__ + return cls + + def implements_to_string(cls): + cls.__unicode__ = cls.__str__ + cls.__str__ = lambda x: x.__unicode__().encode('utf-8') + return cls + + def encode_filename(filename): + if isinstance(filename, unicode): + return filename.encode('utf-8') + return filename + + +def with_metaclass(meta, *bases): + """Create a base class with a metaclass.""" + # This requires a bit of explanation: the basic idea is to make a + # dummy metaclass for one level of class instantiation that replaces + # itself with the actual metaclass. + class metaclass(type): + def __new__(cls, name, this_bases, d): + return meta(name, bases, d) + return type.__new__(metaclass, 'temporary_class', (), {}) + + +try: + from urllib.parse import quote_from_bytes as url_quote +except ImportError: + from urllib import quote as url_quote diff --git a/python/jinja2/_identifier.py b/python/jinja2/_identifier.py new file mode 100644 index 0000000..2eac35d --- /dev/null +++ b/python/jinja2/_identifier.py @@ -0,0 +1,2 @@ +# generated by scripts/generate_identifier_pattern.py +pattern = '·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-ٰٟۖ-ۜ۟-۪ۤۧۨ-ܑۭܰ-݊ަ-ް߫-߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛ࣔ-ࣣ࣡-ःऺ-़ा-ॏ॑-ॗॢॣঁ-ঃ়া-ৄেৈো-্ৗৢৣਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑੰੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣஂா-ூெ-ைொ-்ௗఀ-ఃా-ౄె-ైొ-్ౕౖౢౣಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣഁ-ഃാ-ൄെ-ൈൊ-്ൗൢൣංඃ්ා-ුූෘ-ෟෲෳัิ-ฺ็-๎ັິ-ູົຼ່-ໍ༹༘༙༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏႚ-ႝ፝-፟ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝᠋-᠍ᢅᢆᢩᤠ-ᤫᤰ-᤻ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼᪰-᪽ᬀ-ᬄ᬴-᭄᭫-᭳ᮀ-ᮂᮡ-ᮭ᯦-᯳ᰤ-᰷᳐-᳔᳒-᳨᳭ᳲ-᳴᳸᳹᷀-᷵᷻-᷿‿⁀⁔⃐-⃥⃜⃡-⃰℘℮⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꙯ꙴ-꙽ꚞꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-ꣅ꣠-꣱ꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀ꧥꨩ-ꨶꩃꩌꩍꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭ﬞ︀-️︠-︯︳︴﹍-﹏＿𐇽𐋠𐍶-𐍺𐨁-𐨃𐨅𐨆𐨌-𐨏𐨸-𐨿𐨺𐫦𐫥𑀀-𑀂𑀸-𑁆𑁿-𑂂𑂰-𑂺𑄀-𑄂𑄧-𑅳𑄴𑆀-𑆂𑆳-𑇊𑇀-𑇌𑈬-𑈷𑈾𑋟-𑋪𑌀-𑌃𑌼𑌾-𑍄𑍇𑍈𑍋-𑍍𑍗𑍢𑍣𑍦-𑍬𑍰-𑍴𑐵-𑑆𑒰-𑓃𑖯-𑖵𑖸-𑗀𑗜𑗝𑘰-𑙀𑚫-𑚷𑜝-𑜫𑰯-𑰶𑰸-𑰿𑲒-𑲧𑲩-𑲶𖫰-𖫴𖬰-𖬶𖽑-𖽾𖾏-𖾒𛲝𛲞𝅥-𝅩𝅭-𝅲𝅻-𝆂𝆅-𝆋𝆪-𝆭𝉂-𝉄𝨀-𝨶𝨻-𝩬𝩵𝪄𝪛-𝪟𝪡-𝪯𞀀-𞀆𞀈-𞀘𞀛-𞀡𞀣𞀤𞀦-𞣐𞀪-𞣖𞥄-𞥊󠄀-󠇯' diff --git a/python/jinja2/asyncfilters.py b/python/jinja2/asyncfilters.py new file mode 100644 index 0000000..5c1f46d --- /dev/null +++ b/python/jinja2/asyncfilters.py @@ -0,0 +1,146 @@ +from functools import wraps + +from jinja2.asyncsupport import auto_aiter +from jinja2 import filters + + +async def auto_to_seq(value): + seq = [] + if hasattr(value, '__aiter__'): + async for item in value: + seq.append(item) + else: + for item in value: + seq.append(item) + return seq + + +async def async_select_or_reject(args, kwargs, modfunc, lookup_attr): + seq, func = filters.prepare_select_or_reject( + args, kwargs, modfunc, lookup_attr) + if seq: + async for item in auto_aiter(seq): + if func(item): + yield item + + +def dualfilter(normal_filter, async_filter): + wrap_evalctx = False + if getattr(normal_filter, 'environmentfilter', False): + is_async = lambda args: args[0].is_async + wrap_evalctx = False + else: + if not getattr(normal_filter, 'evalcontextfilter', False) and \ + not getattr(normal_filter, 'contextfilter', False): + wrap_evalctx = True + is_async = lambda args: args[0].environment.is_async + + @wraps(normal_filter) + def wrapper(*args, **kwargs): + b = is_async(args) + if wrap_evalctx: + args = args[1:] + if b: + return async_filter(*args, **kwargs) + return normal_filter(*args, **kwargs) + + if wrap_evalctx: + wrapper.evalcontextfilter = True + + wrapper.asyncfiltervariant = True + + return wrapper + + +def asyncfiltervariant(original): + def decorator(f): + return dualfilter(original, f) + return decorator + + +@asyncfiltervariant(filters.do_first) +async def do_first(environment, seq): + try: + return await auto_aiter(seq).__anext__() + except StopAsyncIteration: + return environment.undefined('No first item, sequence was empty.') + + +@asyncfiltervariant(filters.do_groupby) +async def do_groupby(environment, value, attribute): + expr = filters.make_attrgetter(environment, attribute) + return [filters._GroupTuple(key, await auto_to_seq(values)) + for key, values in filters.groupby(sorted( + await auto_to_seq(value), key=expr), expr)] + + +@asyncfiltervariant(filters.do_join) +async def do_join(eval_ctx, value, d=u'', attribute=None): + return filters.do_join(eval_ctx, await auto_to_seq(value), d, attribute) + + +@asyncfiltervariant(filters.do_list) +async def do_list(value): + return await auto_to_seq(value) + + +@asyncfiltervariant(filters.do_reject) +async def do_reject(*args, **kwargs): + return async_select_or_reject(args, kwargs, lambda x: not x, False) + + +@asyncfiltervariant(filters.do_rejectattr) +async def do_rejectattr(*args, **kwargs): + return async_select_or_reject(args, kwargs, lambda x: not x, True) + + +@asyncfiltervariant(filters.do_select) +async def do_select(*args, **kwargs): + return async_select_or_reject(args, kwargs, lambda x: x, False) + + +@asyncfiltervariant(filters.do_selectattr) +async def do_selectattr(*args, **kwargs): + return async_select_or_reject(args, kwargs, lambda x: x, True) + + +@asyncfiltervariant(filters.do_map) +async def do_map(*args, **kwargs): + seq, func = filters.prepare_map(args, kwargs) + if seq: + async for item in auto_aiter(seq): + yield func(item) + + +@asyncfiltervariant(filters.do_sum) +async def do_sum(environment, iterable, attribute=None, start=0): + rv = start + if attribute is not None: + func = filters.make_attrgetter(environment, attribute) + else: + func = lambda x: x + async for item in auto_aiter(iterable): + rv += func(item) + return rv + + +@asyncfiltervariant(filters.do_slice) +async def do_slice(value, slices, fill_with=None): + return filters.do_slice(await auto_to_seq(value), slices, fill_with) + + +ASYNC_FILTERS = { + 'first': do_first, + 'groupby': do_groupby, + 'join': do_join, + 'list': do_list, + # we intentionally do not support do_last because that would be + # ridiculous + 'reject': do_reject, + 'rejectattr': do_rejectattr, + 'map': do_map, + 'select': do_select, + 'selectattr': do_selectattr, + 'sum': do_sum, + 'slice': do_slice, +} diff --git a/python/jinja2/asyncsupport.py b/python/jinja2/asyncsupport.py new file mode 100644 index 0000000..b1e7b5c --- /dev/null +++ b/python/jinja2/asyncsupport.py @@ -0,0 +1,256 @@ +# -*- coding: utf-8 -*- +""" + jinja2.asyncsupport + ~~~~~~~~~~~~~~~~~~~ + + Has all the code for async support which is implemented as a patch + for supported Python versions. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import sys +import asyncio +import inspect +from functools import update_wrapper + +from jinja2.utils import concat, internalcode, Markup +from jinja2.environment import TemplateModule +from jinja2.runtime import LoopContextBase, _last_iteration + + +async def concat_async(async_gen): + rv = [] + async def collect(): + async for event in async_gen: + rv.append(event) + await collect() + return concat(rv) + + +async def generate_async(self, *args, **kwargs): + vars = dict(*args, **kwargs) + try: + async for event in self.root_render_func(self.new_context(vars)): + yield event + except Exception: + exc_info = sys.exc_info() + else: + return + yield self.environment.handle_exception(exc_info, True) + + +def wrap_generate_func(original_generate): + def _convert_generator(self, loop, args, kwargs): + async_gen = self.generate_async(*args, **kwargs) + try: + while 1: + yield loop.run_until_complete(async_gen.__anext__()) + except StopAsyncIteration: + pass + def generate(self, *args, **kwargs): + if not self.environment.is_async: + return original_generate(self, *args, **kwargs) + return _convert_generator(self, asyncio.get_event_loop(), args, kwargs) + return update_wrapper(generate, original_generate) + + +async def render_async(self, *args, **kwargs): + if not self.environment.is_async: + raise RuntimeError('The environment was not created with async mode ' + 'enabled.') + + vars = dict(*args, **kwargs) + ctx = self.new_context(vars) + + try: + return await concat_async(self.root_render_func(ctx)) + except Exception: + exc_info = sys.exc_info() + return self.environment.handle_exception(exc_info, True) + + +def wrap_render_func(original_render): + def render(self, *args, **kwargs): + if not self.environment.is_async: + return original_render(self, *args, **kwargs) + loop = asyncio.get_event_loop() + return loop.run_until_complete(self.render_async(*args, **kwargs)) + return update_wrapper(render, original_render) + + +def wrap_block_reference_call(original_call): + @internalcode + async def async_call(self): + rv = await concat_async(self._stack[self._depth](self._context)) + if self._context.eval_ctx.autoescape: + rv = Markup(rv) + return rv + + @internalcode + def __call__(self): + if not self._context.environment.is_async: + return original_call(self) + return async_call(self) + + return update_wrapper(__call__, original_call) + + +def wrap_macro_invoke(original_invoke): + @internalcode + async def async_invoke(self, arguments, autoescape): + rv = await self._func(*arguments) + if autoescape: + rv = Markup(rv) + return rv + + @internalcode + def _invoke(self, arguments, autoescape): + if not self._environment.is_async: + return original_invoke(self, arguments, autoescape) + return async_invoke(self, arguments, autoescape) + return update_wrapper(_invoke, original_invoke) + + +@internalcode +async def get_default_module_async(self): + if self._module is not None: + return self._module + self._module = rv = await self.make_module_async() + return rv + + +def wrap_default_module(original_default_module): + @internalcode + def _get_default_module(self): + if self.environment.is_async: + raise RuntimeError('Template module attribute is unavailable ' + 'in async mode') + return original_default_module(self) + return _get_default_module + + +async def make_module_async(self, vars=None, shared=False, locals=None): + context = self.new_context(vars, shared, locals) + body_stream = [] + async for item in self.root_render_func(context): + body_stream.append(item) + return TemplateModule(self, context, body_stream) + + +def patch_template(): + from jinja2 import Template + Template.generate = wrap_generate_func(Template.generate) + Template.generate_async = update_wrapper( + generate_async, Template.generate_async) + Template.render_async = update_wrapper( + render_async, Template.render_async) + Template.render = wrap_render_func(Template.render) + Template._get_default_module = wrap_default_module( + Template._get_default_module) + Template._get_default_module_async = get_default_module_async + Template.make_module_async = update_wrapper( + make_module_async, Template.make_module_async) + + +def patch_runtime(): + from jinja2.runtime import BlockReference, Macro + BlockReference.__call__ = wrap_block_reference_call( + BlockReference.__call__) + Macro._invoke = wrap_macro_invoke(Macro._invoke) + + +def patch_filters(): + from jinja2.filters import FILTERS + from jinja2.asyncfilters import ASYNC_FILTERS + FILTERS.update(ASYNC_FILTERS) + + +def patch_all(): + patch_template() + patch_runtime() + patch_filters() + + +async def auto_await(value): + if inspect.isawaitable(value): + return await value + return value + + +async def auto_aiter(iterable): + if hasattr(iterable, '__aiter__'): + async for item in iterable: + yield item + return + for item in iterable: + yield item + + +class AsyncLoopContext(LoopContextBase): + + def __init__(self, async_iterator, undefined, after, length, recurse=None, + depth0=0): + LoopContextBase.__init__(self, undefined, recurse, depth0) + self._async_iterator = async_iterator + self._after = after + self._length = length + + @property + def length(self): + if self._length is None: + raise TypeError('Loop length for some iterators cannot be ' + 'lazily calculated in async mode') + return self._length + + def __aiter__(self): + return AsyncLoopContextIterator(self) + + +class AsyncLoopContextIterator(object): + __slots__ = ('context',) + + def __init__(self, context): + self.context = context + + def __aiter__(self): + return self + + async def __anext__(self): + ctx = self.context + ctx.index0 += 1 + if ctx._after is _last_iteration: + raise StopAsyncIteration() + ctx._before = ctx._current + ctx._current = ctx._after + try: + ctx._after = await ctx._async_iterator.__anext__() + except StopAsyncIteration: + ctx._after = _last_iteration + return ctx._current, ctx + + +async def make_async_loop_context(iterable, undefined, recurse=None, depth0=0): + # Length is more complicated and less efficient in async mode. The + # reason for this is that we cannot know if length will be used + # upfront but because length is a property we cannot lazily execute it + # later. This means that we need to buffer it up and measure :( + # + # We however only do this for actual iterators, not for async + # iterators as blocking here does not seem like the best idea in the + # world. + try: + length = len(iterable) + except (TypeError, AttributeError): + if not hasattr(iterable, '__aiter__'): + iterable = tuple(iterable) + length = len(iterable) + else: + length = None + async_iterator = auto_aiter(iterable) + try: + after = await async_iterator.__anext__() + except StopAsyncIteration: + after = _last_iteration + return AsyncLoopContext(async_iterator, undefined, after, length, recurse, + depth0) diff --git a/python/jinja2/bccache.py b/python/jinja2/bccache.py new file mode 100644 index 0000000..080e527 --- /dev/null +++ b/python/jinja2/bccache.py @@ -0,0 +1,362 @@ +# -*- coding: utf-8 -*- +""" + jinja2.bccache + ~~~~~~~~~~~~~~ + + This module implements the bytecode cache system Jinja is optionally + using. This is useful if you have very complex template situations and + the compiliation of all those templates slow down your application too + much. + + Situations where this is useful are often forking web applications that + are initialized on the first request. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD. +""" +from os import path, listdir +import os +import sys +import stat +import errno +import marshal +import tempfile +import fnmatch +from hashlib import sha1 +from jinja2.utils import open_if_exists +from jinja2._compat import BytesIO, pickle, PY2, text_type + + +# marshal works better on 3.x, one hack less required +if not PY2: + marshal_dump = marshal.dump + marshal_load = marshal.load +else: + + def marshal_dump(code, f): + if isinstance(f, file): + marshal.dump(code, f) + else: + f.write(marshal.dumps(code)) + + def marshal_load(f): + if isinstance(f, file): + return marshal.load(f) + return marshal.loads(f.read()) + + +bc_version = 3 + +# magic version used to only change with new jinja versions. With 2.6 +# we change this to also take Python version changes into account. The +# reason for this is that Python tends to segfault if fed earlier bytecode +# versions because someone thought it would be a good idea to reuse opcodes +# or make Python incompatible with earlier versions. +bc_magic = 'j2'.encode('ascii') + \ + pickle.dumps(bc_version, 2) + \ + pickle.dumps((sys.version_info[0] << 24) | sys.version_info[1]) + + +class Bucket(object): + """Buckets are used to store the bytecode for one template. It's created + and initialized by the bytecode cache and passed to the loading functions. + + The buckets get an internal checksum from the cache assigned and use this + to automatically reject outdated cache material. Individual bytecode + cache subclasses don't have to care about cache invalidation. + """ + + def __init__(self, environment, key, checksum): + self.environment = environment + self.key = key + self.checksum = checksum + self.reset() + + def reset(self): + """Resets the bucket (unloads the bytecode).""" + self.code = None + + def load_bytecode(self, f): + """Loads bytecode from a file or file like object.""" + # make sure the magic header is correct + magic = f.read(len(bc_magic)) + if magic != bc_magic: + self.reset() + return + # the source code of the file changed, we need to reload + checksum = pickle.load(f) + if self.checksum != checksum: + self.reset() + return + # if marshal_load fails then we need to reload + try: + self.code = marshal_load(f) + except (EOFError, ValueError, TypeError): + self.reset() + return + + def write_bytecode(self, f): + """Dump the bytecode into the file or file like object passed.""" + if self.code is None: + raise TypeError('can\'t write empty bucket') + f.write(bc_magic) + pickle.dump(self.checksum, f, 2) + marshal_dump(self.code, f) + + def bytecode_from_string(self, string): + """Load bytecode from a string.""" + self.load_bytecode(BytesIO(string)) + + def bytecode_to_string(self): + """Return the bytecode as string.""" + out = BytesIO() + self.write_bytecode(out) + return out.getvalue() + + +class BytecodeCache(object): + """To implement your own bytecode cache you have to subclass this class + and override :meth:`load_bytecode` and :meth:`dump_bytecode`. Both of + these methods are passed a :class:`~jinja2.bccache.Bucket`. + + A very basic bytecode cache that saves the bytecode on the file system:: + + from os import path + + class MyCache(BytecodeCache): + + def __init__(self, directory): + self.directory = directory + + def load_bytecode(self, bucket): + filename = path.join(self.directory, bucket.key) + if path.exists(filename): + with open(filename, 'rb') as f: + bucket.load_bytecode(f) + + def dump_bytecode(self, bucket): + filename = path.join(self.directory, bucket.key) + with open(filename, 'wb') as f: + bucket.write_bytecode(f) + + A more advanced version of a filesystem based bytecode cache is part of + Jinja2. + """ + + def load_bytecode(self, bucket): + """Subclasses have to override this method to load bytecode into a + bucket. If they are not able to find code in the cache for the + bucket, it must not do anything. + """ + raise NotImplementedError() + + def dump_bytecode(self, bucket): + """Subclasses have to override this method to write the bytecode + from a bucket back to the cache. If it unable to do so it must not + fail silently but raise an exception. + """ + raise NotImplementedError() + + def clear(self): + """Clears the cache. This method is not used by Jinja2 but should be + implemented to allow applications to clear the bytecode cache used + by a particular environment. + """ + + def get_cache_key(self, name, filename=None): + """Returns the unique hash key for this template name.""" + hash = sha1(name.encode('utf-8')) + if filename is not None: + filename = '|' + filename + if isinstance(filename, text_type): + filename = filename.encode('utf-8') + hash.update(filename) + return hash.hexdigest() + + def get_source_checksum(self, source): + """Returns a checksum for the source.""" + return sha1(source.encode('utf-8')).hexdigest() + + def get_bucket(self, environment, name, filename, source): + """Return a cache bucket for the given template. All arguments are + mandatory but filename may be `None`. + """ + key = self.get_cache_key(name, filename) + checksum = self.get_source_checksum(source) + bucket = Bucket(environment, key, checksum) + self.load_bytecode(bucket) + return bucket + + def set_bucket(self, bucket): + """Put the bucket into the cache.""" + self.dump_bytecode(bucket) + + +class FileSystemBytecodeCache(BytecodeCache): + """A bytecode cache that stores bytecode on the filesystem. It accepts + two arguments: The directory where the cache items are stored and a + pattern string that is used to build the filename. + + If no directory is specified a default cache directory is selected. On + Windows the user's temp directory is used, on UNIX systems a directory + is created for the user in the system temp directory. + + The pattern can be used to have multiple separate caches operate on the + same directory. The default pattern is ``'__jinja2_%s.cache'``. ``%s`` + is replaced with the cache key. + + >>> bcc = FileSystemBytecodeCache('/tmp/jinja_cache', '%s.cache') + + This bytecode cache supports clearing of the cache using the clear method. + """ + + def __init__(self, directory=None, pattern='__jinja2_%s.cache'): + if directory is None: + directory = self._get_default_cache_dir() + self.directory = directory + self.pattern = pattern + + def _get_default_cache_dir(self): + def _unsafe_dir(): + raise RuntimeError('Cannot determine safe temp directory. You ' + 'need to explicitly provide one.') + + tmpdir = tempfile.gettempdir() + + # On windows the temporary directory is used specific unless + # explicitly forced otherwise. We can just use that. + if os.name == 'nt': + return tmpdir + if not hasattr(os, 'getuid'): + _unsafe_dir() + + dirname = '_jinja2-cache-%d' % os.getuid() + actual_dir = os.path.join(tmpdir, dirname) + + try: + os.mkdir(actual_dir, stat.S_IRWXU) + except OSError as e: + if e.errno != errno.EEXIST: + raise + try: + os.chmod(actual_dir, stat.S_IRWXU) + actual_dir_stat = os.lstat(actual_dir) + if actual_dir_stat.st_uid != os.getuid() \ + or not stat.S_ISDIR(actual_dir_stat.st_mode) \ + or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU: + _unsafe_dir() + except OSError as e: + if e.errno != errno.EEXIST: + raise + + actual_dir_stat = os.lstat(actual_dir) + if actual_dir_stat.st_uid != os.getuid() \ + or not stat.S_ISDIR(actual_dir_stat.st_mode) \ + or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU: + _unsafe_dir() + + return actual_dir + + def _get_cache_filename(self, bucket): + return path.join(self.directory, self.pattern % bucket.key) + + def load_bytecode(self, bucket): + f = open_if_exists(self._get_cache_filename(bucket), 'rb') + if f is not None: + try: + bucket.load_bytecode(f) + finally: + f.close() + + def dump_bytecode(self, bucket): + f = open(self._get_cache_filename(bucket), 'wb') + try: + bucket.write_bytecode(f) + finally: + f.close() + + def clear(self): + # imported lazily here because google app-engine doesn't support + # write access on the file system and the function does not exist + # normally. + from os import remove + files = fnmatch.filter(listdir(self.directory), self.pattern % '*') + for filename in files: + try: + remove(path.join(self.directory, filename)) + except OSError: + pass + + +class MemcachedBytecodeCache(BytecodeCache): + """This class implements a bytecode cache that uses a memcache cache for + storing the information. It does not enforce a specific memcache library + (tummy's memcache or cmemcache) but will accept any class that provides + the minimal interface required. + + Libraries compatible with this class: + + - `werkzeug <http://werkzeug.pocoo.org/>`_.contrib.cache + - `python-memcached <https://www.tummy.com/Community/software/python-memcached/>`_ + - `cmemcache <http://gijsbert.org/cmemcache/>`_ + + (Unfortunately the django cache interface is not compatible because it + does not support storing binary data, only unicode. You can however pass + the underlying cache client to the bytecode cache which is available + as `django.core.cache.cache._client`.) + + The minimal interface for the client passed to the constructor is this: + + .. class:: MinimalClientInterface + + .. method:: set(key, value[, timeout]) + + Stores the bytecode in the cache. `value` is a string and + `timeout` the timeout of the key. If timeout is not provided + a default timeout or no timeout should be assumed, if it's + provided it's an integer with the number of seconds the cache + item should exist. + + .. method:: get(key) + + Returns the value for the cache key. If the item does not + exist in the cache the return value must be `None`. + + The other arguments to the constructor are the prefix for all keys that + is added before the actual cache key and the timeout for the bytecode in + the cache system. We recommend a high (or no) timeout. + + This bytecode cache does not support clearing of used items in the cache. + The clear method is a no-operation function. + + .. versionadded:: 2.7 + Added support for ignoring memcache errors through the + `ignore_memcache_errors` parameter. + """ + + def __init__(self, client, prefix='jinja2/bytecode/', timeout=None, + ignore_memcache_errors=True): + self.client = client + self.prefix = prefix + self.timeout = timeout + self.ignore_memcache_errors = ignore_memcache_errors + + def load_bytecode(self, bucket): + try: + code = self.client.get(self.prefix + bucket.key) + except Exception: + if not self.ignore_memcache_errors: + raise + code = None + if code is not None: + bucket.bytecode_from_string(code) + + def dump_bytecode(self, bucket): + args = (self.prefix + bucket.key, bucket.bytecode_to_string()) + if self.timeout is not None: + args += (self.timeout,) + try: + self.client.set(*args) + except Exception: + if not self.ignore_memcache_errors: + raise diff --git a/python/jinja2/compiler.py b/python/jinja2/compiler.py new file mode 100644 index 0000000..d534a82 --- /dev/null +++ b/python/jinja2/compiler.py @@ -0,0 +1,1721 @@ +# -*- coding: utf-8 -*- +""" + jinja2.compiler + ~~~~~~~~~~~~~~~ + + Compiles nodes into python code. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +from itertools import chain +from copy import deepcopy +from keyword import iskeyword as is_python_keyword +from functools import update_wrapper +from jinja2 import nodes +from jinja2.nodes import EvalContext +from jinja2.visitor import NodeVisitor +from jinja2.optimizer import Optimizer +from jinja2.exceptions import TemplateAssertionError +from jinja2.utils import Markup, concat, escape +from jinja2._compat import range_type, text_type, string_types, \ + iteritems, NativeStringIO, imap, izip +from jinja2.idtracking import Symbols, VAR_LOAD_PARAMETER, \ + VAR_LOAD_RESOLVE, VAR_LOAD_ALIAS, VAR_LOAD_UNDEFINED + + +operators = { + 'eq': '==', + 'ne': '!=', + 'gt': '>', + 'gteq': '>=', + 'lt': '<', + 'lteq': '<=', + 'in': 'in', + 'notin': 'not in' +} + +# what method to iterate over items do we want to use for dict iteration +# in generated code? on 2.x let's go with iteritems, on 3.x with items +if hasattr(dict, 'iteritems'): + dict_item_iter = 'iteritems' +else: + dict_item_iter = 'items' + +code_features = ['division'] + +# does this python version support generator stops? (PEP 0479) +try: + exec('from __future__ import generator_stop') + code_features.append('generator_stop') +except SyntaxError: + pass + +# does this python version support yield from? +try: + exec('def f(): yield from x()') +except SyntaxError: + supports_yield_from = False +else: + supports_yield_from = True + + +def optimizeconst(f): + def new_func(self, node, frame, **kwargs): + # Only optimize if the frame is not volatile + if self.optimized and not frame.eval_ctx.volatile: + new_node = self.optimizer.visit(node, frame.eval_ctx) + if new_node != node: + return self.visit(new_node, frame) + return f(self, node, frame, **kwargs) + return update_wrapper(new_func, f) + + +def generate(node, environment, name, filename, stream=None, + defer_init=False, optimized=True): + """Generate the python source for a node tree.""" + if not isinstance(node, nodes.Template): + raise TypeError('Can\'t compile non template nodes') + generator = environment.code_generator_class(environment, name, filename, + stream, defer_init, + optimized) + generator.visit(node) + if stream is None: + return generator.stream.getvalue() + + +def has_safe_repr(value): + """Does the node have a safe representation?""" + if value is None or value is NotImplemented or value is Ellipsis: + return True + if type(value) in (bool, int, float, complex, range_type, Markup) + string_types: + return True + if type(value) in (tuple, list, set, frozenset): + for item in value: + if not has_safe_repr(item): + return False + return True + elif type(value) is dict: + for key, value in iteritems(value): + if not has_safe_repr(key): + return False + if not has_safe_repr(value): + return False + return True + return False + + +def find_undeclared(nodes, names): + """Check if the names passed are accessed undeclared. The return value + is a set of all the undeclared names from the sequence of names found. + """ + visitor = UndeclaredNameVisitor(names) + try: + for node in nodes: + visitor.visit(node) + except VisitorExit: + pass + return visitor.undeclared + + +class MacroRef(object): + + def __init__(self, node): + self.node = node + self.accesses_caller = False + self.accesses_kwargs = False + self.accesses_varargs = False + + +class Frame(object): + """Holds compile time information for us.""" + + def __init__(self, eval_ctx, parent=None, level=None): + self.eval_ctx = eval_ctx + self.symbols = Symbols(parent and parent.symbols or None, + level=level) + + # a toplevel frame is the root + soft frames such as if conditions. + self.toplevel = False + + # the root frame is basically just the outermost frame, so no if + # conditions. This information is used to optimize inheritance + # situations. + self.rootlevel = False + + # in some dynamic inheritance situations the compiler needs to add + # write tests around output statements. + self.require_output_check = parent and parent.require_output_check + + # inside some tags we are using a buffer rather than yield statements. + # this for example affects {% filter %} or {% macro %}. If a frame + # is buffered this variable points to the name of the list used as + # buffer. + self.buffer = None + + # the name of the block we're in, otherwise None. + self.block = parent and parent.block or None + + # the parent of this frame + self.parent = parent + + if parent is not None: + self.buffer = parent.buffer + + def copy(self): + """Create a copy of the current one.""" + rv = object.__new__(self.__class__) + rv.__dict__.update(self.__dict__) + rv.symbols = self.symbols.copy() + return rv + + def inner(self, isolated=False): + """Return an inner frame.""" + if isolated: + return Frame(self.eval_ctx, level=self.symbols.level + 1) + return Frame(self.eval_ctx, self) + + def soft(self): + """Return a soft frame. A soft frame may not be modified as + standalone thing as it shares the resources with the frame it + was created of, but it's not a rootlevel frame any longer. + + This is only used to implement if-statements. + """ + rv = self.copy() + rv.rootlevel = False + return rv + + __copy__ = copy + + +class VisitorExit(RuntimeError): + """Exception used by the `UndeclaredNameVisitor` to signal a stop.""" + + +class DependencyFinderVisitor(NodeVisitor): + """A visitor that collects filter and test calls.""" + + def __init__(self): + self.filters = set() + self.tests = set() + + def visit_Filter(self, node): + self.generic_visit(node) + self.filters.add(node.name) + + def visit_Test(self, node): + self.generic_visit(node) + self.tests.add(node.name) + + def visit_Block(self, node): + """Stop visiting at blocks.""" + + +class UndeclaredNameVisitor(NodeVisitor): + """A visitor that checks if a name is accessed without being + declared. This is different from the frame visitor as it will + not stop at closure frames. + """ + + def __init__(self, names): + self.names = set(names) + self.undeclared = set() + + def visit_Name(self, node): + if node.ctx == 'load' and node.name in self.names: + self.undeclared.add(node.name) + if self.undeclared == self.names: + raise VisitorExit() + else: + self.names.discard(node.name) + + def visit_Block(self, node): + """Stop visiting a blocks.""" + + +class CompilerExit(Exception): + """Raised if the compiler encountered a situation where it just + doesn't make sense to further process the code. Any block that + raises such an exception is not further processed. + """ + + +class CodeGenerator(NodeVisitor): + + def __init__(self, environment, name, filename, stream=None, + defer_init=False, optimized=True): + if stream is None: + stream = NativeStringIO() + self.environment = environment + self.name = name + self.filename = filename + self.stream = stream + self.created_block_context = False + self.defer_init = defer_init + self.optimized = optimized + if optimized: + self.optimizer = Optimizer(environment) + + # aliases for imports + self.import_aliases = {} + + # a registry for all blocks. Because blocks are moved out + # into the global python scope they are registered here + self.blocks = {} + + # the number of extends statements so far + self.extends_so_far = 0 + + # some templates have a rootlevel extends. In this case we + # can safely assume that we're a child template and do some + # more optimizations. + self.has_known_extends = False + + # the current line number + self.code_lineno = 1 + + # registry of all filters and tests (global, not block local) + self.tests = {} + self.filters = {} + + # the debug information + self.debug_info = [] + self._write_debug_info = None + + # the number of new lines before the next write() + self._new_lines = 0 + + # the line number of the last written statement + self._last_line = 0 + + # true if nothing was written so far. + self._first_write = True + + # used by the `temporary_identifier` method to get new + # unique, temporary identifier + self._last_identifier = 0 + + # the current indentation + self._indentation = 0 + + # Tracks toplevel assignments + self._assign_stack = [] + + # Tracks parameter definition blocks + self._param_def_block = [] + + # Tracks the current context. + self._context_reference_stack = ['context'] + + # -- Various compilation helpers + + def fail(self, msg, lineno): + """Fail with a :exc:`TemplateAssertionError`.""" + raise TemplateAssertionError(msg, lineno, self.name, self.filename) + + def temporary_identifier(self): + """Get a new unique identifier.""" + self._last_identifier += 1 + return 't_%d' % self._last_identifier + + def buffer(self, frame): + """Enable buffering for the frame from that point onwards.""" + frame.buffer = self.temporary_identifier() + self.writeline('%s = []' % frame.buffer) + + def return_buffer_contents(self, frame, force_unescaped=False): + """Return the buffer contents of the frame.""" + if not force_unescaped: + if frame.eval_ctx.volatile: + self.writeline('if context.eval_ctx.autoescape:') + self.indent() + self.writeline('return Markup(concat(%s))' % frame.buffer) + self.outdent() + self.writeline('else:') + self.indent() + self.writeline('return concat(%s)' % frame.buffer) + self.outdent() + return + elif frame.eval_ctx.autoescape: + self.writeline('return Markup(concat(%s))' % frame.buffer) + return + self.writeline('return concat(%s)' % frame.buffer) + + def indent(self): + """Indent by one.""" + self._indentation += 1 + + def outdent(self, step=1): + """Outdent by step.""" + self._indentation -= step + + def start_write(self, frame, node=None): + """Yield or write into the frame buffer.""" + if frame.buffer is None: + self.writeline('yield ', node) + else: + self.writeline('%s.append(' % frame.buffer, node) + + def end_write(self, frame): + """End the writing process started by `start_write`.""" + if frame.buffer is not None: + self.write(')') + + def simple_write(self, s, frame, node=None): + """Simple shortcut for start_write + write + end_write.""" + self.start_write(frame, node) + self.write(s) + self.end_write(frame) + + def blockvisit(self, nodes, frame): + """Visit a list of nodes as block in a frame. If the current frame + is no buffer a dummy ``if 0: yield None`` is written automatically. + """ + try: + self.writeline('pass') + for node in nodes: + self.visit(node, frame) + except CompilerExit: + pass + + def write(self, x): + """Write a string into the output stream.""" + if self._new_lines: + if not self._first_write: + self.stream.write('\n' * self._new_lines) + self.code_lineno += self._new_lines + if self._write_debug_info is not None: + self.debug_info.append((self._write_debug_info, + self.code_lineno)) + self._write_debug_info = None + self._first_write = False + self.stream.write(' ' * self._indentation) + self._new_lines = 0 + self.stream.write(x) + + def writeline(self, x, node=None, extra=0): + """Combination of newline and write.""" + self.newline(node, extra) + self.write(x) + + def newline(self, node=None, extra=0): + """Add one or more newlines before the next write.""" + self._new_lines = max(self._new_lines, 1 + extra) + if node is not None and node.lineno != self._last_line: + self._write_debug_info = node.lineno + self._last_line = node.lineno + + def signature(self, node, frame, extra_kwargs=None): + """Writes a function call to the stream for the current node. + A leading comma is added automatically. The extra keyword + arguments may not include python keywords otherwise a syntax + error could occour. The extra keyword arguments should be given + as python dict. + """ + # if any of the given keyword arguments is a python keyword + # we have to make sure that no invalid call is created. + kwarg_workaround = False + for kwarg in chain((x.key for x in node.kwargs), extra_kwargs or ()): + if is_python_keyword(kwarg): + kwarg_workaround = True + break + + for arg in node.args: + self.write(', ') + self.visit(arg, frame) + + if not kwarg_workaround: + for kwarg in node.kwargs: + self.write(', ') + self.visit(kwarg, frame) + if extra_kwargs is not None: + for key, value in iteritems(extra_kwargs): + self.write(', %s=%s' % (key, value)) + if node.dyn_args: + self.write(', *') + self.visit(node.dyn_args, frame) + + if kwarg_workaround: + if node.dyn_kwargs is not None: + self.write(', **dict({') + else: + self.write(', **{') + for kwarg in node.kwargs: + self.write('%r: ' % kwarg.key) + self.visit(kwarg.value, frame) + self.write(', ') + if extra_kwargs is not None: + for key, value in iteritems(extra_kwargs): + self.write('%r: %s, ' % (key, value)) + if node.dyn_kwargs is not None: + self.write('}, **') + self.visit(node.dyn_kwargs, frame) + self.write(')') + else: + self.write('}') + + elif node.dyn_kwargs is not None: + self.write(', **') + self.visit(node.dyn_kwargs, frame) + + def pull_dependencies(self, nodes): + """Pull all the dependencies.""" + visitor = DependencyFinderVisitor() + for node in nodes: + visitor.visit(node) + for dependency in 'filters', 'tests': + mapping = getattr(self, dependency) + for name in getattr(visitor, dependency): + if name not in mapping: + mapping[name] = self.temporary_identifier() + self.writeline('%s = environment.%s[%r]' % + (mapping[name], dependency, name)) + + def enter_frame(self, frame): + undefs = [] + for target, (action, param) in iteritems(frame.symbols.loads): + if action == VAR_LOAD_PARAMETER: + pass + elif action == VAR_LOAD_RESOLVE: + self.writeline('%s = %s(%r)' % + (target, self.get_resolve_func(), param)) + elif action == VAR_LOAD_ALIAS: + self.writeline('%s = %s' % (target, param)) + elif action == VAR_LOAD_UNDEFINED: + undefs.append(target) + else: + raise NotImplementedError('unknown load instruction') + if undefs: + self.writeline('%s = missing' % ' = '.join(undefs)) + + def leave_frame(self, frame, with_python_scope=False): + if not with_python_scope: + undefs = [] + for target, _ in iteritems(frame.symbols.loads): + undefs.append(target) + if undefs: + self.writeline('%s = missing' % ' = '.join(undefs)) + + def func(self, name): + if self.environment.is_async: + return 'async def %s' % name + return 'def %s' % name + + def macro_body(self, node, frame): + """Dump the function def of a macro or call block.""" + frame = frame.inner() + frame.symbols.analyze_node(node) + macro_ref = MacroRef(node) + + explicit_caller = None + skip_special_params = set() + args = [] + for idx, arg in enumerate(node.args): + if arg.name == 'caller': + explicit_caller = idx + if arg.name in ('kwargs', 'varargs'): + skip_special_params.add(arg.name) + args.append(frame.symbols.ref(arg.name)) + + undeclared = find_undeclared(node.body, ('caller', 'kwargs', 'varargs')) + + if 'caller' in undeclared: + # In older Jinja2 versions there was a bug that allowed caller + # to retain the special behavior even if it was mentioned in + # the argument list. However thankfully this was only really + # working if it was the last argument. So we are explicitly + # checking this now and error out if it is anywhere else in + # the argument list. + if explicit_caller is not None: + try: + node.defaults[explicit_caller - len(node.args)] + except IndexError: + self.fail('When defining macros or call blocks the ' + 'special "caller" argument must be omitted ' + 'or be given a default.', node.lineno) + else: + args.append(frame.symbols.declare_parameter('caller')) + macro_ref.accesses_caller = True + if 'kwargs' in undeclared and not 'kwargs' in skip_special_params: + args.append(frame.symbols.declare_parameter('kwargs')) + macro_ref.accesses_kwargs = True + if 'varargs' in undeclared and not 'varargs' in skip_special_params: + args.append(frame.symbols.declare_parameter('varargs')) + macro_ref.accesses_varargs = True + + # macros are delayed, they never require output checks + frame.require_output_check = False + frame.symbols.analyze_node(node) + self.writeline('%s(%s):' % (self.func('macro'), ', '.join(args)), node) + self.indent() + + self.buffer(frame) + self.enter_frame(frame) + + self.push_parameter_definitions(frame) + for idx, arg in enumerate(node.args): + ref = frame.symbols.ref(arg.name) + self.writeline('if %s is missing:' % ref) + self.indent() + try: + default = node.defaults[idx - len(node.args)] + except IndexError: + self.writeline('%s = undefined(%r, name=%r)' % ( + ref, + 'parameter %r was not provided' % arg.name, + arg.name)) + else: + self.writeline('%s = ' % ref) + self.visit(default, frame) + self.mark_parameter_stored(ref) + self.outdent() + self.pop_parameter_definitions() + + self.blockvisit(node.body, frame) + self.return_buffer_contents(frame, force_unescaped=True) + self.leave_frame(frame, with_python_scope=True) + self.outdent() + + return frame, macro_ref + + def macro_def(self, macro_ref, frame): + """Dump the macro definition for the def created by macro_body.""" + arg_tuple = ', '.join(repr(x.name) for x in macro_ref.node.args) + name = getattr(macro_ref.node, 'name', None) + if len(macro_ref.node.args) == 1: + arg_tuple += ',' + self.write('Macro(environment, macro, %r, (%s), %r, %r, %r, ' + 'context.eval_ctx.autoescape)' % + (name, arg_tuple, macro_ref.accesses_kwargs, + macro_ref.accesses_varargs, macro_ref.accesses_caller)) + + def position(self, node): + """Return a human readable position for the node.""" + rv = 'line %d' % node.lineno + if self.name is not None: + rv += ' in ' + repr(self.name) + return rv + + def dump_local_context(self, frame): + return '{%s}' % ', '.join( + '%r: %s' % (name, target) for name, target + in iteritems(frame.symbols.dump_stores())) + + def write_commons(self): + """Writes a common preamble that is used by root and block functions. + Primarily this sets up common local helpers and enforces a generator + through a dead branch. + """ + self.writeline('resolve = context.resolve_or_missing') + self.writeline('undefined = environment.undefined') + self.writeline('if 0: yield None') + + def push_parameter_definitions(self, frame): + """Pushes all parameter targets from the given frame into a local + stack that permits tracking of yet to be assigned parameters. In + particular this enables the optimization from `visit_Name` to skip + undefined expressions for parameters in macros as macros can reference + otherwise unbound parameters. + """ + self._param_def_block.append(frame.symbols.dump_param_targets()) + + def pop_parameter_definitions(self): + """Pops the current parameter definitions set.""" + self._param_def_block.pop() + + def mark_parameter_stored(self, target): + """Marks a parameter in the current parameter definitions as stored. + This will skip the enforced undefined checks. + """ + if self._param_def_block: + self._param_def_block[-1].discard(target) + + def push_context_reference(self, target): + self._context_reference_stack.append(target) + + def pop_context_reference(self): + self._context_reference_stack.pop() + + def get_context_ref(self): + return self._context_reference_stack[-1] + + def get_resolve_func(self): + target = self._context_reference_stack[-1] + if target == 'context': + return 'resolve' + return '%s.resolve' % target + + def derive_context(self, frame): + return '%s.derived(%s)' % ( + self.get_context_ref(), + self.dump_local_context(frame), + ) + + def parameter_is_undeclared(self, target): + """Checks if a given target is an undeclared parameter.""" + if not self._param_def_block: + return False + return target in self._param_def_block[-1] + + def push_assign_tracking(self): + """Pushes a new layer for assignment tracking.""" + self._assign_stack.append(set()) + + def pop_assign_tracking(self, frame): + """Pops the topmost level for assignment tracking and updates the + context variables if necessary. + """ + vars = self._assign_stack.pop() + if not frame.toplevel or not vars: + return + public_names = [x for x in vars if x[:1] != '_'] + if len(vars) == 1: + name = next(iter(vars)) + ref = frame.symbols.ref(name) + self.writeline('context.vars[%r] = %s' % (name, ref)) + else: + self.writeline('context.vars.update({') + for idx, name in enumerate(vars): + if idx: + self.write(', ') + ref = frame.symbols.ref(name) + self.write('%r: %s' % (name, ref)) + self.write('})') + if public_names: + if len(public_names) == 1: + self.writeline('context.exported_vars.add(%r)' % + public_names[0]) + else: + self.writeline('context.exported_vars.update((%s))' % + ', '.join(imap(repr, public_names))) + + # -- Statement Visitors + + def visit_Template(self, node, frame=None): + assert frame is None, 'no root frame allowed' + eval_ctx = EvalContext(self.environment, self.name) + + from jinja2.runtime import __all__ as exported + self.writeline('from __future__ import %s' % ', '.join(code_features)) + self.writeline('from jinja2.runtime import ' + ', '.join(exported)) + + if self.environment.is_async: + self.writeline('from jinja2.asyncsupport import auto_await, ' + 'auto_aiter, make_async_loop_context') + + # if we want a deferred initialization we cannot move the + # environment into a local name + envenv = not self.defer_init and ', environment=environment' or '' + + # do we have an extends tag at all? If not, we can save some + # overhead by just not processing any inheritance code. + have_extends = node.find(nodes.Extends) is not None + + # find all blocks + for block in node.find_all(nodes.Block): + if block.name in self.blocks: + self.fail('block %r defined twice' % block.name, block.lineno) + self.blocks[block.name] = block + + # find all imports and import them + for import_ in node.find_all(nodes.ImportedName): + if import_.importname not in self.import_aliases: + imp = import_.importname + self.import_aliases[imp] = alias = self.temporary_identifier() + if '.' in imp: + module, obj = imp.rsplit('.', 1) + self.writeline('from %s import %s as %s' % + (module, obj, alias)) + else: + self.writeline('import %s as %s' % (imp, alias)) + + # add the load name + self.writeline('name = %r' % self.name) + + # generate the root render function. + self.writeline('%s(context, missing=missing%s):' % + (self.func('root'), envenv), extra=1) + self.indent() + self.write_commons() + + # process the root + frame = Frame(eval_ctx) + if 'self' in find_undeclared(node.body, ('self',)): + ref = frame.symbols.declare_parameter('self') + self.writeline('%s = TemplateReference(context)' % ref) + frame.symbols.analyze_node(node) + frame.toplevel = frame.rootlevel = True + frame.require_output_check = have_extends and not self.has_known_extends + if have_extends: + self.writeline('parent_template = None') + self.enter_frame(frame) + self.pull_dependencies(node.body) + self.blockvisit(node.body, frame) + self.leave_frame(frame, with_python_scope=True) + self.outdent() + + # make sure that the parent root is called. + if have_extends: + if not self.has_known_extends: + self.indent() + self.writeline('if parent_template is not None:') + self.indent() + if supports_yield_from and not self.environment.is_async: + self.writeline('yield from parent_template.' + 'root_render_func(context)') + else: + self.writeline('%sfor event in parent_template.' + 'root_render_func(context):' % + (self.environment.is_async and 'async ' or '')) + self.indent() + self.writeline('yield event') + self.outdent() + self.outdent(1 + (not self.has_known_extends)) + + # at this point we now have the blocks collected and can visit them too. + for name, block in iteritems(self.blocks): + self.writeline('%s(context, missing=missing%s):' % + (self.func('block_' + name), envenv), + block, 1) + self.indent() + self.write_commons() + # It's important that we do not make this frame a child of the + # toplevel template. This would cause a variety of + # interesting issues with identifier tracking. + block_frame = Frame(eval_ctx) + undeclared = find_undeclared(block.body, ('self', 'super')) + if 'self' in undeclared: + ref = block_frame.symbols.declare_parameter('self') + self.writeline('%s = TemplateReference(context)' % ref) + if 'super' in undeclared: + ref = block_frame.symbols.declare_parameter('super') + self.writeline('%s = context.super(%r, ' + 'block_%s)' % (ref, name, name)) + block_frame.symbols.analyze_node(block) + block_frame.block = name + self.enter_frame(block_frame) + self.pull_dependencies(block.body) + self.blockvisit(block.body, block_frame) + self.leave_frame(block_frame, with_python_scope=True) + self.outdent() + + self.writeline('blocks = {%s}' % ', '.join('%r: block_%s' % (x, x) + for x in self.blocks), + extra=1) + + # add a function that returns the debug info + self.writeline('debug_info = %r' % '&'.join('%s=%s' % x for x + in self.debug_info)) + + def visit_Block(self, node, frame): + """Call a block and register it for the template.""" + level = 0 + if frame.toplevel: + # if we know that we are a child template, there is no need to + # check if we are one + if self.has_known_extends: + return + if self.extends_so_far > 0: + self.writeline('if parent_template is None:') + self.indent() + level += 1 + + if node.scoped: + context = self.derive_context(frame) + else: + context = self.get_context_ref() + + if supports_yield_from and not self.environment.is_async and \ + frame.buffer is None: + self.writeline('yield from context.blocks[%r][0](%s)' % ( + node.name, context), node) + else: + loop = self.environment.is_async and 'async for' or 'for' + self.writeline('%s event in context.blocks[%r][0](%s):' % ( + loop, node.name, context), node) + self.indent() + self.simple_write('event', frame) + self.outdent() + + self.outdent(level) + + def visit_Extends(self, node, frame): + """Calls the extender.""" + if not frame.toplevel: + self.fail('cannot use extend from a non top-level scope', + node.lineno) + + # if the number of extends statements in general is zero so + # far, we don't have to add a check if something extended + # the template before this one. + if self.extends_so_far > 0: + + # if we have a known extends we just add a template runtime + # error into the generated code. We could catch that at compile + # time too, but i welcome it not to confuse users by throwing the + # same error at different times just "because we can". + if not self.has_known_extends: + self.writeline('if parent_template is not None:') + self.indent() + self.writeline('raise TemplateRuntimeError(%r)' % + 'extended multiple times') + + # if we have a known extends already we don't need that code here + # as we know that the template execution will end here. + if self.has_known_extends: + raise CompilerExit() + else: + self.outdent() + + self.writeline('parent_template = environment.get_template(', node) + self.visit(node.template, frame) + self.write(', %r)' % self.name) + self.writeline('for name, parent_block in parent_template.' + 'blocks.%s():' % dict_item_iter) + self.indent() + self.writeline('context.blocks.setdefault(name, []).' + 'append(parent_block)') + self.outdent() + + # if this extends statement was in the root level we can take + # advantage of that information and simplify the generated code + # in the top level from this point onwards + if frame.rootlevel: + self.has_known_extends = True + + # and now we have one more + self.extends_so_far += 1 + + def visit_Include(self, node, frame): + """Handles includes.""" + if node.ignore_missing: + self.writeline('try:') + self.indent() + + func_name = 'get_or_select_template' + if isinstance(node.template, nodes.Const): + if isinstance(node.template.value, string_types): + func_name = 'get_template' + elif isinstance(node.template.value, (tuple, list)): + func_name = 'select_template' + elif isinstance(node.template, (nodes.Tuple, nodes.List)): + func_name = 'select_template' + + self.writeline('template = environment.%s(' % func_name, node) + self.visit(node.template, frame) + self.write(', %r)' % self.name) + if node.ignore_missing: + self.outdent() + self.writeline('except TemplateNotFound:') + self.indent() + self.writeline('pass') + self.outdent() + self.writeline('else:') + self.indent() + + skip_event_yield = False + if node.with_context: + loop = self.environment.is_async and 'async for' or 'for' + self.writeline('%s event in template.root_render_func(' + 'template.new_context(context.get_all(), True, ' + '%s)):' % (loop, self.dump_local_context(frame))) + elif self.environment.is_async: + self.writeline('for event in (await ' + 'template._get_default_module_async())' + '._body_stream:') + else: + if supports_yield_from: + self.writeline('yield from template._get_default_module()' + '._body_stream') + skip_event_yield = True + else: + self.writeline('for event in template._get_default_module()' + '._body_stream:') + + if not skip_event_yield: + self.indent() + self.simple_write('event', frame) + self.outdent() + + if node.ignore_missing: + self.outdent() + + def visit_Import(self, node, frame): + """Visit regular imports.""" + self.writeline('%s = ' % frame.symbols.ref(node.target), node) + if frame.toplevel: + self.write('context.vars[%r] = ' % node.target) + if self.environment.is_async: + self.write('await ') + self.write('environment.get_template(') + self.visit(node.template, frame) + self.write(', %r).' % self.name) + if node.with_context: + self.write('make_module%s(context.get_all(), True, %s)' + % (self.environment.is_async and '_async' or '', + self.dump_local_context(frame))) + elif self.environment.is_async: + self.write('_get_default_module_async()') + else: + self.write('_get_default_module()') + if frame.toplevel and not node.target.startswith('_'): + self.writeline('context.exported_vars.discard(%r)' % node.target) + + def visit_FromImport(self, node, frame): + """Visit named imports.""" + self.newline(node) + self.write('included_template = %senvironment.get_template(' + % (self.environment.is_async and 'await ' or '')) + self.visit(node.template, frame) + self.write(', %r).' % self.name) + if node.with_context: + self.write('make_module%s(context.get_all(), True, %s)' + % (self.environment.is_async and '_async' or '', + self.dump_local_context(frame))) + elif self.environment.is_async: + self.write('_get_default_module_async()') + else: + self.write('_get_default_module()') + + var_names = [] + discarded_names = [] + for name in node.names: + if isinstance(name, tuple): + name, alias = name + else: + alias = name + self.writeline('%s = getattr(included_template, ' + '%r, missing)' % (frame.symbols.ref(alias), name)) + self.writeline('if %s is missing:' % frame.symbols.ref(alias)) + self.indent() + self.writeline('%s = undefined(%r %% ' + 'included_template.__name__, ' + 'name=%r)' % + (frame.symbols.ref(alias), + 'the template %%r (imported on %s) does ' + 'not export the requested name %s' % ( + self.position(node), + repr(name) + ), name)) + self.outdent() + if frame.toplevel: + var_names.append(alias) + if not alias.startswith('_'): + discarded_names.append(alias) + + if var_names: + if len(var_names) == 1: + name = var_names[0] + self.writeline('context.vars[%r] = %s' % + (name, frame.symbols.ref(name))) + else: + self.writeline('context.vars.update({%s})' % ', '.join( + '%r: %s' % (name, frame.symbols.ref(name)) for name in var_names + )) + if discarded_names: + if len(discarded_names) == 1: + self.writeline('context.exported_vars.discard(%r)' % + discarded_names[0]) + else: + self.writeline('context.exported_vars.difference_' + 'update((%s))' % ', '.join(imap(repr, discarded_names))) + + def visit_For(self, node, frame): + loop_frame = frame.inner() + test_frame = frame.inner() + else_frame = frame.inner() + + # try to figure out if we have an extended loop. An extended loop + # is necessary if the loop is in recursive mode if the special loop + # variable is accessed in the body. + extended_loop = node.recursive or 'loop' in \ + find_undeclared(node.iter_child_nodes( + only=('body',)), ('loop',)) + + loop_ref = None + if extended_loop: + loop_ref = loop_frame.symbols.declare_parameter('loop') + + loop_frame.symbols.analyze_node(node, for_branch='body') + if node.else_: + else_frame.symbols.analyze_node(node, for_branch='else') + + if node.test: + loop_filter_func = self.temporary_identifier() + test_frame.symbols.analyze_node(node, for_branch='test') + self.writeline('%s(fiter):' % self.func(loop_filter_func), node.test) + self.indent() + self.enter_frame(test_frame) + self.writeline(self.environment.is_async and 'async for ' or 'for ') + self.visit(node.target, loop_frame) + self.write(' in ') + self.write(self.environment.is_async and 'auto_aiter(fiter)' or 'fiter') + self.write(':') + self.indent() + self.writeline('if ', node.test) + self.visit(node.test, test_frame) + self.write(':') + self.indent() + self.writeline('yield ') + self.visit(node.target, loop_frame) + self.outdent(3) + self.leave_frame(test_frame, with_python_scope=True) + + # if we don't have an recursive loop we have to find the shadowed + # variables at that point. Because loops can be nested but the loop + # variable is a special one we have to enforce aliasing for it. + if node.recursive: + self.writeline('%s(reciter, loop_render_func, depth=0):' % + self.func('loop'), node) + self.indent() + self.buffer(loop_frame) + + # Use the same buffer for the else frame + else_frame.buffer = loop_frame.buffer + + # make sure the loop variable is a special one and raise a template + # assertion error if a loop tries to write to loop + if extended_loop: + self.writeline('%s = missing' % loop_ref) + + for name in node.find_all(nodes.Name): + if name.ctx == 'store' and name.name == 'loop': + self.fail('Can\'t assign to special loop variable ' + 'in for-loop target', name.lineno) + + if node.else_: + iteration_indicator = self.temporary_identifier() + self.writeline('%s = 1' % iteration_indicator) + + self.writeline(self.environment.is_async and 'async for ' or 'for ', node) + self.visit(node.target, loop_frame) + if extended_loop: + if self.environment.is_async: + self.write(', %s in await make_async_loop_context(' % loop_ref) + else: + self.write(', %s in LoopContext(' % loop_ref) + else: + self.write(' in ') + + if node.test: + self.write('%s(' % loop_filter_func) + if node.recursive: + self.write('reciter') + else: + if self.environment.is_async and not extended_loop: + self.write('auto_aiter(') + self.visit(node.iter, frame) + if self.environment.is_async and not extended_loop: + self.write(')') + if node.test: + self.write(')') + + if node.recursive: + self.write(', undefined, loop_render_func, depth):') + else: + self.write(extended_loop and ', undefined):' or ':') + + self.indent() + self.enter_frame(loop_frame) + + self.blockvisit(node.body, loop_frame) + if node.else_: + self.writeline('%s = 0' % iteration_indicator) + self.outdent() + self.leave_frame(loop_frame, with_python_scope=node.recursive + and not node.else_) + + if node.else_: + self.writeline('if %s:' % iteration_indicator) + self.indent() + self.enter_frame(else_frame) + self.blockvisit(node.else_, else_frame) + self.leave_frame(else_frame) + self.outdent() + + # if the node was recursive we have to return the buffer contents + # and start the iteration code + if node.recursive: + self.return_buffer_contents(loop_frame) + self.outdent() + self.start_write(frame, node) + if self.environment.is_async: + self.write('await ') + self.write('loop(') + if self.environment.is_async: + self.write('auto_aiter(') + self.visit(node.iter, frame) + if self.environment.is_async: + self.write(')') + self.write(', loop)') + self.end_write(frame) + + def visit_If(self, node, frame): + if_frame = frame.soft() + self.writeline('if ', node) + self.visit(node.test, if_frame) + self.write(':') + self.indent() + self.blockvisit(node.body, if_frame) + self.outdent() + for elif_ in node.elif_: + self.writeline('elif ', elif_) + self.visit(elif_.test, if_frame) + self.write(':') + self.indent() + self.blockvisit(elif_.body, if_frame) + self.outdent() + if node.else_: + self.writeline('else:') + self.indent() + self.blockvisit(node.else_, if_frame) + self.outdent() + + def visit_Macro(self, node, frame): + macro_frame, macro_ref = self.macro_body(node, frame) + self.newline() + if frame.toplevel: + if not node.name.startswith('_'): + self.write('context.exported_vars.add(%r)' % node.name) + ref = frame.symbols.ref(node.name) + self.writeline('context.vars[%r] = ' % node.name) + self.write('%s = ' % frame.symbols.ref(node.name)) + self.macro_def(macro_ref, macro_frame) + + def visit_CallBlock(self, node, frame): + call_frame, macro_ref = self.macro_body(node, frame) + self.writeline('caller = ') + self.macro_def(macro_ref, call_frame) + self.start_write(frame, node) + self.visit_Call(node.call, frame, forward_caller=True) + self.end_write(frame) + + def visit_FilterBlock(self, node, frame): + filter_frame = frame.inner() + filter_frame.symbols.analyze_node(node) + self.enter_frame(filter_frame) + self.buffer(filter_frame) + self.blockvisit(node.body, filter_frame) + self.start_write(frame, node) + self.visit_Filter(node.filter, filter_frame) + self.end_write(frame) + self.leave_frame(filter_frame) + + def visit_With(self, node, frame): + with_frame = frame.inner() + with_frame.symbols.analyze_node(node) + self.enter_frame(with_frame) + for idx, (target, expr) in enumerate(izip(node.targets, node.values)): + self.newline() + self.visit(target, with_frame) + self.write(' = ') + self.visit(expr, frame) + self.blockvisit(node.body, with_frame) + self.leave_frame(with_frame) + + def visit_ExprStmt(self, node, frame): + self.newline(node) + self.visit(node.node, frame) + + def visit_Output(self, node, frame): + # if we have a known extends statement, we don't output anything + # if we are in a require_output_check section + if self.has_known_extends and frame.require_output_check: + return + + allow_constant_finalize = True + if self.environment.finalize: + func = self.environment.finalize + if getattr(func, 'contextfunction', False) or \ + getattr(func, 'evalcontextfunction', False): + allow_constant_finalize = False + elif getattr(func, 'environmentfunction', False): + finalize = lambda x: text_type( + self.environment.finalize(self.environment, x)) + else: + finalize = lambda x: text_type(self.environment.finalize(x)) + else: + finalize = text_type + + # if we are inside a frame that requires output checking, we do so + outdent_later = False + if frame.require_output_check: + self.writeline('if parent_template is None:') + self.indent() + outdent_later = True + + # try to evaluate as many chunks as possible into a static + # string at compile time. + body = [] + for child in node.nodes: + try: + if not allow_constant_finalize: + raise nodes.Impossible() + const = child.as_const(frame.eval_ctx) + except nodes.Impossible: + body.append(child) + continue + # the frame can't be volatile here, becaus otherwise the + # as_const() function would raise an Impossible exception + # at that point. + try: + if frame.eval_ctx.autoescape: + if hasattr(const, '__html__'): + const = const.__html__() + else: + const = escape(const) + const = finalize(const) + except Exception: + # if something goes wrong here we evaluate the node + # at runtime for easier debugging + body.append(child) + continue + if body and isinstance(body[-1], list): + body[-1].append(const) + else: + body.append([const]) + + # if we have less than 3 nodes or a buffer we yield or extend/append + if len(body) < 3 or frame.buffer is not None: + if frame.buffer is not None: + # for one item we append, for more we extend + if len(body) == 1: + self.writeline('%s.append(' % frame.buffer) + else: + self.writeline('%s.extend((' % frame.buffer) + self.indent() + for item in body: + if isinstance(item, list): + val = repr(concat(item)) + if frame.buffer is None: + self.writeline('yield ' + val) + else: + self.writeline(val + ',') + else: + if frame.buffer is None: + self.writeline('yield ', item) + else: + self.newline(item) + close = 1 + if frame.eval_ctx.volatile: + self.write('(escape if context.eval_ctx.autoescape' + ' else to_string)(') + elif frame.eval_ctx.autoescape: + self.write('escape(') + else: + self.write('to_string(') + if self.environment.finalize is not None: + self.write('environment.finalize(') + if getattr(self.environment.finalize, + "contextfunction", False): + self.write('context, ') + close += 1 + self.visit(item, frame) + self.write(')' * close) + if frame.buffer is not None: + self.write(',') + if frame.buffer is not None: + # close the open parentheses + self.outdent() + self.writeline(len(body) == 1 and ')' or '))') + + # otherwise we create a format string as this is faster in that case + else: + format = [] + arguments = [] + for item in body: + if isinstance(item, list): + format.append(concat(item).replace('%', '%%')) + else: + format.append('%s') + arguments.append(item) + self.writeline('yield ') + self.write(repr(concat(format)) + ' % (') + self.indent() + for argument in arguments: + self.newline(argument) + close = 0 + if frame.eval_ctx.volatile: + self.write('(escape if context.eval_ctx.autoescape else' + ' to_string)(') + close += 1 + elif frame.eval_ctx.autoescape: + self.write('escape(') + close += 1 + if self.environment.finalize is not None: + self.write('environment.finalize(') + if getattr(self.environment.finalize, + 'contextfunction', False): + self.write('context, ') + elif getattr(self.environment.finalize, + 'evalcontextfunction', False): + self.write('context.eval_ctx, ') + elif getattr(self.environment.finalize, + 'environmentfunction', False): + self.write('environment, ') + close += 1 + self.visit(argument, frame) + self.write(')' * close + ', ') + self.outdent() + self.writeline(')') + + if outdent_later: + self.outdent() + + def visit_Assign(self, node, frame): + self.push_assign_tracking() + self.newline(node) + self.visit(node.target, frame) + self.write(' = ') + self.visit(node.node, frame) + self.pop_assign_tracking(frame) + + def visit_AssignBlock(self, node, frame): + self.push_assign_tracking() + block_frame = frame.inner() + # This is a special case. Since a set block always captures we + # will disable output checks. This way one can use set blocks + # toplevel even in extended templates. + block_frame.require_output_check = False + block_frame.symbols.analyze_node(node) + self.enter_frame(block_frame) + self.buffer(block_frame) + self.blockvisit(node.body, block_frame) + self.newline(node) + self.visit(node.target, frame) + self.write(' = (Markup if context.eval_ctx.autoescape ' + 'else identity)(') + if node.filter is not None: + self.visit_Filter(node.filter, block_frame) + else: + self.write('concat(%s)' % block_frame.buffer) + self.write(')') + self.pop_assign_tracking(frame) + self.leave_frame(block_frame) + + # -- Expression Visitors + + def visit_Name(self, node, frame): + if node.ctx == 'store' and frame.toplevel: + if self._assign_stack: + self._assign_stack[-1].add(node.name) + ref = frame.symbols.ref(node.name) + + # If we are looking up a variable we might have to deal with the + # case where it's undefined. We can skip that case if the load + # instruction indicates a parameter which are always defined. + if node.ctx == 'load': + load = frame.symbols.find_load(ref) + if not (load is not None and load[0] == VAR_LOAD_PARAMETER and \ + not self.parameter_is_undeclared(ref)): + self.write('(undefined(name=%r) if %s is missing else %s)' % + (node.name, ref, ref)) + return + + self.write(ref) + + def visit_NSRef(self, node, frame): + # NSRefs can only be used to store values; since they use the normal + # `foo.bar` notation they will be parsed as a normal attribute access + # when used anywhere but in a `set` context + ref = frame.symbols.ref(node.name) + self.writeline('if not isinstance(%s, Namespace):' % ref) + self.indent() + self.writeline('raise TemplateRuntimeError(%r)' % + 'cannot assign attribute on non-namespace object') + self.outdent() + self.writeline('%s[%r]' % (ref, node.attr)) + + def visit_Const(self, node, frame): + val = node.as_const(frame.eval_ctx) + if isinstance(val, float): + self.write(str(val)) + else: + self.write(repr(val)) + + def visit_TemplateData(self, node, frame): + try: + self.write(repr(node.as_const(frame.eval_ctx))) + except nodes.Impossible: + self.write('(Markup if context.eval_ctx.autoescape else identity)(%r)' + % node.data) + + def visit_Tuple(self, node, frame): + self.write('(') + idx = -1 + for idx, item in enumerate(node.items): + if idx: + self.write(', ') + self.visit(item, frame) + self.write(idx == 0 and ',)' or ')') + + def visit_List(self, node, frame): + self.write('[') + for idx, item in enumerate(node.items): + if idx: + self.write(', ') + self.visit(item, frame) + self.write(']') + + def visit_Dict(self, node, frame): + self.write('{') + for idx, item in enumerate(node.items): + if idx: + self.write(', ') + self.visit(item.key, frame) + self.write(': ') + self.visit(item.value, frame) + self.write('}') + + def binop(operator, interceptable=True): + @optimizeconst + def visitor(self, node, frame): + if self.environment.sandboxed and \ + operator in self.environment.intercepted_binops: + self.write('environment.call_binop(context, %r, ' % operator) + self.visit(node.left, frame) + self.write(', ') + self.visit(node.right, frame) + else: + self.write('(') + self.visit(node.left, frame) + self.write(' %s ' % operator) + self.visit(node.right, frame) + self.write(')') + return visitor + + def uaop(operator, interceptable=True): + @optimizeconst + def visitor(self, node, frame): + if self.environment.sandboxed and \ + operator in self.environment.intercepted_unops: + self.write('environment.call_unop(context, %r, ' % operator) + self.visit(node.node, frame) + else: + self.write('(' + operator) + self.visit(node.node, frame) + self.write(')') + return visitor + + visit_Add = binop('+') + visit_Sub = binop('-') + visit_Mul = binop('*') + visit_Div = binop('/') + visit_FloorDiv = binop('//') + visit_Pow = binop('**') + visit_Mod = binop('%') + visit_And = binop('and', interceptable=False) + visit_Or = binop('or', interceptable=False) + visit_Pos = uaop('+') + visit_Neg = uaop('-') + visit_Not = uaop('not ', interceptable=False) + del binop, uaop + + @optimizeconst + def visit_Concat(self, node, frame): + if frame.eval_ctx.volatile: + func_name = '(context.eval_ctx.volatile and' \ + ' markup_join or unicode_join)' + elif frame.eval_ctx.autoescape: + func_name = 'markup_join' + else: + func_name = 'unicode_join' + self.write('%s((' % func_name) + for arg in node.nodes: + self.visit(arg, frame) + self.write(', ') + self.write('))') + + @optimizeconst + def visit_Compare(self, node, frame): + self.visit(node.expr, frame) + for op in node.ops: + self.visit(op, frame) + + def visit_Operand(self, node, frame): + self.write(' %s ' % operators[node.op]) + self.visit(node.expr, frame) + + @optimizeconst + def visit_Getattr(self, node, frame): + self.write('environment.getattr(') + self.visit(node.node, frame) + self.write(', %r)' % node.attr) + + @optimizeconst + def visit_Getitem(self, node, frame): + # slices bypass the environment getitem method. + if isinstance(node.arg, nodes.Slice): + self.visit(node.node, frame) + self.write('[') + self.visit(node.arg, frame) + self.write(']') + else: + self.write('environment.getitem(') + self.visit(node.node, frame) + self.write(', ') + self.visit(node.arg, frame) + self.write(')') + + def visit_Slice(self, node, frame): + if node.start is not None: + self.visit(node.start, frame) + self.write(':') + if node.stop is not None: + self.visit(node.stop, frame) + if node.step is not None: + self.write(':') + self.visit(node.step, frame) + + @optimizeconst + def visit_Filter(self, node, frame): + if self.environment.is_async: + self.write('await auto_await(') + self.write(self.filters[node.name] + '(') + func = self.environment.filters.get(node.name) + if func is None: + self.fail('no filter named %r' % node.name, node.lineno) + if getattr(func, 'contextfilter', False): + self.write('context, ') + elif getattr(func, 'evalcontextfilter', False): + self.write('context.eval_ctx, ') + elif getattr(func, 'environmentfilter', False): + self.write('environment, ') + + # if the filter node is None we are inside a filter block + # and want to write to the current buffer + if node.node is not None: + self.visit(node.node, frame) + elif frame.eval_ctx.volatile: + self.write('(context.eval_ctx.autoescape and' + ' Markup(concat(%s)) or concat(%s))' % + (frame.buffer, frame.buffer)) + elif frame.eval_ctx.autoescape: + self.write('Markup(concat(%s))' % frame.buffer) + else: + self.write('concat(%s)' % frame.buffer) + self.signature(node, frame) + self.write(')') + if self.environment.is_async: + self.write(')') + + @optimizeconst + def visit_Test(self, node, frame): + self.write(self.tests[node.name] + '(') + if node.name not in self.environment.tests: + self.fail('no test named %r' % node.name, node.lineno) + self.visit(node.node, frame) + self.signature(node, frame) + self.write(')') + + @optimizeconst + def visit_CondExpr(self, node, frame): + def write_expr2(): + if node.expr2 is not None: + return self.visit(node.expr2, frame) + self.write('undefined(%r)' % ('the inline if-' + 'expression on %s evaluated to false and ' + 'no else section was defined.' % self.position(node))) + + self.write('(') + self.visit(node.expr1, frame) + self.write(' if ') + self.visit(node.test, frame) + self.write(' else ') + write_expr2() + self.write(')') + + @optimizeconst + def visit_Call(self, node, frame, forward_caller=False): + if self.environment.is_async: + self.write('await auto_await(') + if self.environment.sandboxed: + self.write('environment.call(context, ') + else: + self.write('context.call(') + self.visit(node.node, frame) + extra_kwargs = forward_caller and {'caller': 'caller'} or None + self.signature(node, frame, extra_kwargs) + self.write(')') + if self.environment.is_async: + self.write(')') + + def visit_Keyword(self, node, frame): + self.write(node.key + '=') + self.visit(node.value, frame) + + # -- Unused nodes for extensions + + def visit_MarkSafe(self, node, frame): + self.write('Markup(') + self.visit(node.expr, frame) + self.write(')') + + def visit_MarkSafeIfAutoescape(self, node, frame): + self.write('(context.eval_ctx.autoescape and Markup or identity)(') + self.visit(node.expr, frame) + self.write(')') + + def visit_EnvironmentAttribute(self, node, frame): + self.write('environment.' + node.name) + + def visit_ExtensionAttribute(self, node, frame): + self.write('environment.extensions[%r].%s' % (node.identifier, node.name)) + + def visit_ImportedName(self, node, frame): + self.write(self.import_aliases[node.importname]) + + def visit_InternalName(self, node, frame): + self.write(node.name) + + def visit_ContextReference(self, node, frame): + self.write('context') + + def visit_Continue(self, node, frame): + self.writeline('continue', node) + + def visit_Break(self, node, frame): + self.writeline('break', node) + + def visit_Scope(self, node, frame): + scope_frame = frame.inner() + scope_frame.symbols.analyze_node(node) + self.enter_frame(scope_frame) + self.blockvisit(node.body, scope_frame) + self.leave_frame(scope_frame) + + def visit_OverlayScope(self, node, frame): + ctx = self.temporary_identifier() + self.writeline('%s = %s' % (ctx, self.derive_context(frame))) + self.writeline('%s.vars = ' % ctx) + self.visit(node.context, frame) + self.push_context_reference(ctx) + + scope_frame = frame.inner(isolated=True) + scope_frame.symbols.analyze_node(node) + self.enter_frame(scope_frame) + self.blockvisit(node.body, scope_frame) + self.leave_frame(scope_frame) + self.pop_context_reference() + + def visit_EvalContextModifier(self, node, frame): + for keyword in node.options: + self.writeline('context.eval_ctx.%s = ' % keyword.key) + self.visit(keyword.value, frame) + try: + val = keyword.value.as_const(frame.eval_ctx) + except nodes.Impossible: + frame.eval_ctx.volatile = True + else: + setattr(frame.eval_ctx, keyword.key, val) + + def visit_ScopedEvalContextModifier(self, node, frame): + old_ctx_name = self.temporary_identifier() + saved_ctx = frame.eval_ctx.save() + self.writeline('%s = context.eval_ctx.save()' % old_ctx_name) + self.visit_EvalContextModifier(node, frame) + for child in node.body: + self.visit(child, frame) + frame.eval_ctx.revert(saved_ctx) + self.writeline('context.eval_ctx.revert(%s)' % old_ctx_name) diff --git a/python/jinja2/constants.py b/python/jinja2/constants.py new file mode 100644 index 0000000..11efd1e --- /dev/null +++ b/python/jinja2/constants.py @@ -0,0 +1,32 @@ +# -*- coding: utf-8 -*- +""" + jinja.constants + ~~~~~~~~~~~~~~~ + + Various constants. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" + + +#: list of lorem ipsum words used by the lipsum() helper function +LOREM_IPSUM_WORDS = u'''\ +a ac accumsan ad adipiscing aenean aliquam aliquet amet ante aptent arcu at +auctor augue bibendum blandit class commodo condimentum congue consectetuer +consequat conubia convallis cras cubilia cum curabitur curae cursus dapibus +diam dictum dictumst dignissim dis dolor donec dui duis egestas eget eleifend +elementum elit enim erat eros est et etiam eu euismod facilisi facilisis fames +faucibus felis fermentum feugiat fringilla fusce gravida habitant habitasse hac +hendrerit hymenaeos iaculis id imperdiet in inceptos integer interdum ipsum +justo lacinia lacus laoreet lectus leo libero ligula litora lobortis lorem +luctus maecenas magna magnis malesuada massa mattis mauris metus mi molestie +mollis montes morbi mus nam nascetur natoque nec neque netus nibh nisi nisl non +nonummy nostra nulla nullam nunc odio orci ornare parturient pede pellentesque +penatibus per pharetra phasellus placerat platea porta porttitor posuere +potenti praesent pretium primis proin pulvinar purus quam quis quisque rhoncus +ridiculus risus rutrum sagittis sapien scelerisque sed sem semper senectus sit +sociis sociosqu sodales sollicitudin suscipit suspendisse taciti tellus tempor +tempus tincidunt torquent tortor tristique turpis ullamcorper ultrices +ultricies urna ut varius vehicula vel velit venenatis vestibulum vitae vivamus +viverra volutpat vulputate''' diff --git a/python/jinja2/debug.py b/python/jinja2/debug.py new file mode 100644 index 0000000..b61139f --- /dev/null +++ b/python/jinja2/debug.py @@ -0,0 +1,372 @@ +# -*- coding: utf-8 -*- +""" + jinja2.debug + ~~~~~~~~~~~~ + + Implements the debug interface for Jinja. This module does some pretty + ugly stuff with the Python traceback system in order to achieve tracebacks + with correct line numbers, locals and contents. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import sys +import traceback +from types import TracebackType, CodeType +from jinja2.utils import missing, internal_code +from jinja2.exceptions import TemplateSyntaxError +from jinja2._compat import iteritems, reraise, PY2 + +# on pypy we can take advantage of transparent proxies +try: + from __pypy__ import tproxy +except ImportError: + tproxy = None + + +# how does the raise helper look like? +try: + exec("raise TypeError, 'foo'") +except SyntaxError: + raise_helper = 'raise __jinja_exception__[1]' +except TypeError: + raise_helper = 'raise __jinja_exception__[0], __jinja_exception__[1]' + + +class TracebackFrameProxy(object): + """Proxies a traceback frame.""" + + def __init__(self, tb): + self.tb = tb + self._tb_next = None + + @property + def tb_next(self): + return self._tb_next + + def set_next(self, next): + if tb_set_next is not None: + try: + tb_set_next(self.tb, next and next.tb or None) + except Exception: + # this function can fail due to all the hackery it does + # on various python implementations. We just catch errors + # down and ignore them if necessary. + pass + self._tb_next = next + + @property + def is_jinja_frame(self): + return '__jinja_template__' in self.tb.tb_frame.f_globals + + def __getattr__(self, name): + return getattr(self.tb, name) + + +def make_frame_proxy(frame): + proxy = TracebackFrameProxy(frame) + if tproxy is None: + return proxy + def operation_handler(operation, *args, **kwargs): + if operation in ('__getattribute__', '__getattr__'): + return getattr(proxy, args[0]) + elif operation == '__setattr__': + proxy.__setattr__(*args, **kwargs) + else: + return getattr(proxy, operation)(*args, **kwargs) + return tproxy(TracebackType, operation_handler) + + +class ProcessedTraceback(object): + """Holds a Jinja preprocessed traceback for printing or reraising.""" + + def __init__(self, exc_type, exc_value, frames): + assert frames, 'no frames for this traceback?' + self.exc_type = exc_type + self.exc_value = exc_value + self.frames = frames + + # newly concatenate the frames (which are proxies) + prev_tb = None + for tb in self.frames: + if prev_tb is not None: + prev_tb.set_next(tb) + prev_tb = tb + prev_tb.set_next(None) + + def render_as_text(self, limit=None): + """Return a string with the traceback.""" + lines = traceback.format_exception(self.exc_type, self.exc_value, + self.frames[0], limit=limit) + return ''.join(lines).rstrip() + + def render_as_html(self, full=False): + """Return a unicode string with the traceback as rendered HTML.""" + from jinja2.debugrenderer import render_traceback + return u'%s\n\n<!--\n%s\n-->' % ( + render_traceback(self, full=full), + self.render_as_text().decode('utf-8', 'replace') + ) + + @property + def is_template_syntax_error(self): + """`True` if this is a template syntax error.""" + return isinstance(self.exc_value, TemplateSyntaxError) + + @property + def exc_info(self): + """Exception info tuple with a proxy around the frame objects.""" + return self.exc_type, self.exc_value, self.frames[0] + + @property + def standard_exc_info(self): + """Standard python exc_info for re-raising""" + tb = self.frames[0] + # the frame will be an actual traceback (or transparent proxy) if + # we are on pypy or a python implementation with support for tproxy + if type(tb) is not TracebackType: + tb = tb.tb + return self.exc_type, self.exc_value, tb + + +def make_traceback(exc_info, source_hint=None): + """Creates a processed traceback object from the exc_info.""" + exc_type, exc_value, tb = exc_info + if isinstance(exc_value, TemplateSyntaxError): + exc_info = translate_syntax_error(exc_value, source_hint) + initial_skip = 0 + else: + initial_skip = 1 + return translate_exception(exc_info, initial_skip) + + +def translate_syntax_error(error, source=None): + """Rewrites a syntax error to please traceback systems.""" + error.source = source + error.translated = True + exc_info = (error.__class__, error, None) + filename = error.filename + if filename is None: + filename = '<unknown>' + return fake_exc_info(exc_info, filename, error.lineno) + + +def translate_exception(exc_info, initial_skip=0): + """If passed an exc_info it will automatically rewrite the exceptions + all the way down to the correct line numbers and frames. + """ + tb = exc_info[2] + frames = [] + + # skip some internal frames if wanted + for x in range(initial_skip): + if tb is not None: + tb = tb.tb_next + initial_tb = tb + + while tb is not None: + # skip frames decorated with @internalcode. These are internal + # calls we can't avoid and that are useless in template debugging + # output. + if tb.tb_frame.f_code in internal_code: + tb = tb.tb_next + continue + + # save a reference to the next frame if we override the current + # one with a faked one. + next = tb.tb_next + + # fake template exceptions + template = tb.tb_frame.f_globals.get('__jinja_template__') + if template is not None: + lineno = template.get_corresponding_lineno(tb.tb_lineno) + tb = fake_exc_info(exc_info[:2] + (tb,), template.filename, + lineno)[2] + + frames.append(make_frame_proxy(tb)) + tb = next + + # if we don't have any exceptions in the frames left, we have to + # reraise it unchanged. + # XXX: can we backup here? when could this happen? + if not frames: + reraise(exc_info[0], exc_info[1], exc_info[2]) + + return ProcessedTraceback(exc_info[0], exc_info[1], frames) + + +def get_jinja_locals(real_locals): + ctx = real_locals.get('context') + if ctx: + locals = ctx.get_all().copy() + else: + locals = {} + + local_overrides = {} + + for name, value in iteritems(real_locals): + if not name.startswith('l_') or value is missing: + continue + try: + _, depth, name = name.split('_', 2) + depth = int(depth) + except ValueError: + continue + cur_depth = local_overrides.get(name, (-1,))[0] + if cur_depth < depth: + local_overrides[name] = (depth, value) + + for name, (_, value) in iteritems(local_overrides): + if value is missing: + locals.pop(name, None) + else: + locals[name] = value + + return locals + + +def fake_exc_info(exc_info, filename, lineno): + """Helper for `translate_exception`.""" + exc_type, exc_value, tb = exc_info + + # figure the real context out + if tb is not None: + locals = get_jinja_locals(tb.tb_frame.f_locals) + + # if there is a local called __jinja_exception__, we get + # rid of it to not break the debug functionality. + locals.pop('__jinja_exception__', None) + else: + locals = {} + + # assamble fake globals we need + globals = { + '__name__': filename, + '__file__': filename, + '__jinja_exception__': exc_info[:2], + + # we don't want to keep the reference to the template around + # to not cause circular dependencies, but we mark it as Jinja + # frame for the ProcessedTraceback + '__jinja_template__': None + } + + # and fake the exception + code = compile('\n' * (lineno - 1) + raise_helper, filename, 'exec') + + # if it's possible, change the name of the code. This won't work + # on some python environments such as google appengine + try: + if tb is None: + location = 'template' + else: + function = tb.tb_frame.f_code.co_name + if function == 'root': + location = 'top-level template code' + elif function.startswith('block_'): + location = 'block "%s"' % function[6:] + else: + location = 'template' + + if PY2: + code = CodeType(0, code.co_nlocals, code.co_stacksize, + code.co_flags, code.co_code, code.co_consts, + code.co_names, code.co_varnames, filename, + location, code.co_firstlineno, + code.co_lnotab, (), ()) + else: + code = CodeType(0, code.co_kwonlyargcount, + code.co_nlocals, code.co_stacksize, + code.co_flags, code.co_code, code.co_consts, + code.co_names, code.co_varnames, filename, + location, code.co_firstlineno, + code.co_lnotab, (), ()) + except Exception as e: + pass + + # execute the code and catch the new traceback + try: + exec(code, globals, locals) + except: + exc_info = sys.exc_info() + new_tb = exc_info[2].tb_next + + # return without this frame + return exc_info[:2] + (new_tb,) + + +def _init_ugly_crap(): + """This function implements a few ugly things so that we can patch the + traceback objects. The function returned allows resetting `tb_next` on + any python traceback object. Do not attempt to use this on non cpython + interpreters + """ + import ctypes + from types import TracebackType + + if PY2: + # figure out size of _Py_ssize_t for Python 2: + if hasattr(ctypes.pythonapi, 'Py_InitModule4_64'): + _Py_ssize_t = ctypes.c_int64 + else: + _Py_ssize_t = ctypes.c_int + else: + # platform ssize_t on Python 3 + _Py_ssize_t = ctypes.c_ssize_t + + # regular python + class _PyObject(ctypes.Structure): + pass + _PyObject._fields_ = [ + ('ob_refcnt', _Py_ssize_t), + ('ob_type', ctypes.POINTER(_PyObject)) + ] + + # python with trace + if hasattr(sys, 'getobjects'): + class _PyObject(ctypes.Structure): + pass + _PyObject._fields_ = [ + ('_ob_next', ctypes.POINTER(_PyObject)), + ('_ob_prev', ctypes.POINTER(_PyObject)), + ('ob_refcnt', _Py_ssize_t), + ('ob_type', ctypes.POINTER(_PyObject)) + ] + + class _Traceback(_PyObject): + pass + _Traceback._fields_ = [ + ('tb_next', ctypes.POINTER(_Traceback)), + ('tb_frame', ctypes.POINTER(_PyObject)), + ('tb_lasti', ctypes.c_int), + ('tb_lineno', ctypes.c_int) + ] + + def tb_set_next(tb, next): + """Set the tb_next attribute of a traceback object.""" + if not (isinstance(tb, TracebackType) and + (next is None or isinstance(next, TracebackType))): + raise TypeError('tb_set_next arguments must be traceback objects') + obj = _Traceback.from_address(id(tb)) + if tb.tb_next is not None: + old = _Traceback.from_address(id(tb.tb_next)) + old.ob_refcnt -= 1 + if next is None: + obj.tb_next = ctypes.POINTER(_Traceback)() + else: + next = _Traceback.from_address(id(next)) + next.ob_refcnt += 1 + obj.tb_next = ctypes.pointer(next) + + return tb_set_next + + +# try to get a tb_set_next implementation if we don't have transparent +# proxies. +tb_set_next = None +if tproxy is None: + try: + tb_set_next = _init_ugly_crap() + except: + pass + del _init_ugly_crap diff --git a/python/jinja2/defaults.py b/python/jinja2/defaults.py new file mode 100644 index 0000000..7c93dec --- /dev/null +++ b/python/jinja2/defaults.py @@ -0,0 +1,56 @@ +# -*- coding: utf-8 -*- +""" + jinja2.defaults + ~~~~~~~~~~~~~~~ + + Jinja default filters and tags. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +from jinja2._compat import range_type +from jinja2.utils import generate_lorem_ipsum, Cycler, Joiner, Namespace + + +# defaults for the parser / lexer +BLOCK_START_STRING = '{%' +BLOCK_END_STRING = '%}' +VARIABLE_START_STRING = '{{' +VARIABLE_END_STRING = '}}' +COMMENT_START_STRING = '{#' +COMMENT_END_STRING = '#}' +LINE_STATEMENT_PREFIX = None +LINE_COMMENT_PREFIX = None +TRIM_BLOCKS = False +LSTRIP_BLOCKS = False +NEWLINE_SEQUENCE = '\n' +KEEP_TRAILING_NEWLINE = False + + +# default filters, tests and namespace +from jinja2.filters import FILTERS as DEFAULT_FILTERS +from jinja2.tests import TESTS as DEFAULT_TESTS +DEFAULT_NAMESPACE = { + 'range': range_type, + 'dict': dict, + 'lipsum': generate_lorem_ipsum, + 'cycler': Cycler, + 'joiner': Joiner, + 'namespace': Namespace +} + + +# default policies +DEFAULT_POLICIES = { + 'compiler.ascii_str': True, + 'urlize.rel': 'noopener', + 'urlize.target': None, + 'truncate.leeway': 5, + 'json.dumps_function': None, + 'json.dumps_kwargs': {'sort_keys': True}, + 'ext.i18n.trimmed': False, +} + + +# export all constants +__all__ = tuple(x for x in locals().keys() if x.isupper()) diff --git a/python/jinja2/environment.py b/python/jinja2/environment.py new file mode 100644 index 0000000..549d9af --- /dev/null +++ b/python/jinja2/environment.py @@ -0,0 +1,1276 @@ +# -*- coding: utf-8 -*- +""" + jinja2.environment + ~~~~~~~~~~~~~~~~~~ + + Provides a class that holds runtime and parsing time options. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import os +import sys +import weakref +from functools import reduce, partial +from jinja2 import nodes +from jinja2.defaults import BLOCK_START_STRING, \ + BLOCK_END_STRING, VARIABLE_START_STRING, VARIABLE_END_STRING, \ + COMMENT_START_STRING, COMMENT_END_STRING, LINE_STATEMENT_PREFIX, \ + LINE_COMMENT_PREFIX, TRIM_BLOCKS, NEWLINE_SEQUENCE, \ + DEFAULT_FILTERS, DEFAULT_TESTS, DEFAULT_NAMESPACE, \ + DEFAULT_POLICIES, KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS +from jinja2.lexer import get_lexer, TokenStream +from jinja2.parser import Parser +from jinja2.nodes import EvalContext +from jinja2.compiler import generate, CodeGenerator +from jinja2.runtime import Undefined, new_context, Context +from jinja2.exceptions import TemplateSyntaxError, TemplateNotFound, \ + TemplatesNotFound, TemplateRuntimeError +from jinja2.utils import import_string, LRUCache, Markup, missing, \ + concat, consume, internalcode, have_async_gen +from jinja2._compat import imap, ifilter, string_types, iteritems, \ + text_type, reraise, implements_iterator, implements_to_string, \ + encode_filename, PY2, PYPY + + +# for direct template usage we have up to ten living environments +_spontaneous_environments = LRUCache(10) + +# the function to create jinja traceback objects. This is dynamically +# imported on the first exception in the exception handler. +_make_traceback = None + + +def get_spontaneous_environment(*args): + """Return a new spontaneous environment. A spontaneous environment is an + unnamed and unaccessible (in theory) environment that is used for + templates generated from a string and not from the file system. + """ + try: + env = _spontaneous_environments.get(args) + except TypeError: + return Environment(*args) + if env is not None: + return env + _spontaneous_environments[args] = env = Environment(*args) + env.shared = True + return env + + +def create_cache(size): + """Return the cache class for the given size.""" + if size == 0: + return None + if size < 0: + return {} + return LRUCache(size) + + +def copy_cache(cache): + """Create an empty copy of the given cache.""" + if cache is None: + return None + elif type(cache) is dict: + return {} + return LRUCache(cache.capacity) + + +def load_extensions(environment, extensions): + """Load the extensions from the list and bind it to the environment. + Returns a dict of instantiated environments. + """ + result = {} + for extension in extensions: + if isinstance(extension, string_types): + extension = import_string(extension) + result[extension.identifier] = extension(environment) + return result + + +def fail_for_missing_callable(string, name): + msg = string % name + if isinstance(name, Undefined): + try: + name._fail_with_undefined_error() + except Exception as e: + msg = '%s (%s; did you forget to quote the callable name?)' % (msg, e) + raise TemplateRuntimeError(msg) + + +def _environment_sanity_check(environment): + """Perform a sanity check on the environment.""" + assert issubclass(environment.undefined, Undefined), 'undefined must ' \ + 'be a subclass of undefined because filters depend on it.' + assert environment.block_start_string != \ + environment.variable_start_string != \ + environment.comment_start_string, 'block, variable and comment ' \ + 'start strings must be different' + assert environment.newline_sequence in ('\r', '\r\n', '\n'), \ + 'newline_sequence set to unknown line ending string.' + return environment + + +class Environment(object): + r"""The core component of Jinja is the `Environment`. It contains + important shared variables like configuration, filters, tests, + globals and others. Instances of this class may be modified if + they are not shared and if no template was loaded so far. + Modifications on environments after the first template was loaded + will lead to surprising effects and undefined behavior. + + Here are the possible initialization parameters: + + `block_start_string` + The string marking the beginning of a block. Defaults to ``'{%'``. + + `block_end_string` + The string marking the end of a block. Defaults to ``'%}'``. + + `variable_start_string` + The string marking the beginning of a print statement. + Defaults to ``'{{'``. + + `variable_end_string` + The string marking the end of a print statement. Defaults to + ``'}}'``. + + `comment_start_string` + The string marking the beginning of a comment. Defaults to ``'{#'``. + + `comment_end_string` + The string marking the end of a comment. Defaults to ``'#}'``. + + `line_statement_prefix` + If given and a string, this will be used as prefix for line based + statements. See also :ref:`line-statements`. + + `line_comment_prefix` + If given and a string, this will be used as prefix for line based + comments. See also :ref:`line-statements`. + + .. versionadded:: 2.2 + + `trim_blocks` + If this is set to ``True`` the first newline after a block is + removed (block, not variable tag!). Defaults to `False`. + + `lstrip_blocks` + If this is set to ``True`` leading spaces and tabs are stripped + from the start of a line to a block. Defaults to `False`. + + `newline_sequence` + The sequence that starts a newline. Must be one of ``'\r'``, + ``'\n'`` or ``'\r\n'``. The default is ``'\n'`` which is a + useful default for Linux and OS X systems as well as web + applications. + + `keep_trailing_newline` + Preserve the trailing newline when rendering templates. + The default is ``False``, which causes a single newline, + if present, to be stripped from the end of the template. + + .. versionadded:: 2.7 + + `extensions` + List of Jinja extensions to use. This can either be import paths + as strings or extension classes. For more information have a + look at :ref:`the extensions documentation <jinja-extensions>`. + + `optimized` + should the optimizer be enabled? Default is ``True``. + + `undefined` + :class:`Undefined` or a subclass of it that is used to represent + undefined values in the template. + + `finalize` + A callable that can be used to process the result of a variable + expression before it is output. For example one can convert + ``None`` implicitly into an empty string here. + + `autoescape` + If set to ``True`` the XML/HTML autoescaping feature is enabled by + default. For more details about autoescaping see + :class:`~jinja2.utils.Markup`. As of Jinja 2.4 this can also + be a callable that is passed the template name and has to + return ``True`` or ``False`` depending on autoescape should be + enabled by default. + + .. versionchanged:: 2.4 + `autoescape` can now be a function + + `loader` + The template loader for this environment. + + `cache_size` + The size of the cache. Per default this is ``400`` which means + that if more than 400 templates are loaded the loader will clean + out the least recently used template. If the cache size is set to + ``0`` templates are recompiled all the time, if the cache size is + ``-1`` the cache will not be cleaned. + + .. versionchanged:: 2.8 + The cache size was increased to 400 from a low 50. + + `auto_reload` + Some loaders load templates from locations where the template + sources may change (ie: file system or database). If + ``auto_reload`` is set to ``True`` (default) every time a template is + requested the loader checks if the source changed and if yes, it + will reload the template. For higher performance it's possible to + disable that. + + `bytecode_cache` + If set to a bytecode cache object, this object will provide a + cache for the internal Jinja bytecode so that templates don't + have to be parsed if they were not changed. + + See :ref:`bytecode-cache` for more information. + + `enable_async` + If set to true this enables async template execution which allows + you to take advantage of newer Python features. This requires + Python 3.6 or later. + """ + + #: if this environment is sandboxed. Modifying this variable won't make + #: the environment sandboxed though. For a real sandboxed environment + #: have a look at jinja2.sandbox. This flag alone controls the code + #: generation by the compiler. + sandboxed = False + + #: True if the environment is just an overlay + overlayed = False + + #: the environment this environment is linked to if it is an overlay + linked_to = None + + #: shared environments have this set to `True`. A shared environment + #: must not be modified + shared = False + + #: these are currently EXPERIMENTAL undocumented features. + exception_handler = None + exception_formatter = None + + #: the class that is used for code generation. See + #: :class:`~jinja2.compiler.CodeGenerator` for more information. + code_generator_class = CodeGenerator + + #: the context class thatis used for templates. See + #: :class:`~jinja2.runtime.Context` for more information. + context_class = Context + + def __init__(self, + block_start_string=BLOCK_START_STRING, + block_end_string=BLOCK_END_STRING, + variable_start_string=VARIABLE_START_STRING, + variable_end_string=VARIABLE_END_STRING, + comment_start_string=COMMENT_START_STRING, + comment_end_string=COMMENT_END_STRING, + line_statement_prefix=LINE_STATEMENT_PREFIX, + line_comment_prefix=LINE_COMMENT_PREFIX, + trim_blocks=TRIM_BLOCKS, + lstrip_blocks=LSTRIP_BLOCKS, + newline_sequence=NEWLINE_SEQUENCE, + keep_trailing_newline=KEEP_TRAILING_NEWLINE, + extensions=(), + optimized=True, + undefined=Undefined, + finalize=None, + autoescape=False, + loader=None, + cache_size=400, + auto_reload=True, + bytecode_cache=None, + enable_async=False): + # !!Important notice!! + # The constructor accepts quite a few arguments that should be + # passed by keyword rather than position. However it's important to + # not change the order of arguments because it's used at least + # internally in those cases: + # - spontaneous environments (i18n extension and Template) + # - unittests + # If parameter changes are required only add parameters at the end + # and don't change the arguments (or the defaults!) of the arguments + # existing already. + + # lexer / parser information + self.block_start_string = block_start_string + self.block_end_string = block_end_string + self.variable_start_string = variable_start_string + self.variable_end_string = variable_end_string + self.comment_start_string = comment_start_string + self.comment_end_string = comment_end_string + self.line_statement_prefix = line_statement_prefix + self.line_comment_prefix = line_comment_prefix + self.trim_blocks = trim_blocks + self.lstrip_blocks = lstrip_blocks + self.newline_sequence = newline_sequence + self.keep_trailing_newline = keep_trailing_newline + + # runtime information + self.undefined = undefined + self.optimized = optimized + self.finalize = finalize + self.autoescape = autoescape + + # defaults + self.filters = DEFAULT_FILTERS.copy() + self.tests = DEFAULT_TESTS.copy() + self.globals = DEFAULT_NAMESPACE.copy() + + # set the loader provided + self.loader = loader + self.cache = create_cache(cache_size) + self.bytecode_cache = bytecode_cache + self.auto_reload = auto_reload + + # configurable policies + self.policies = DEFAULT_POLICIES.copy() + + # load extensions + self.extensions = load_extensions(self, extensions) + + self.enable_async = enable_async + self.is_async = self.enable_async and have_async_gen + + _environment_sanity_check(self) + + def add_extension(self, extension): + """Adds an extension after the environment was created. + + .. versionadded:: 2.5 + """ + self.extensions.update(load_extensions(self, [extension])) + + def extend(self, **attributes): + """Add the items to the instance of the environment if they do not exist + yet. This is used by :ref:`extensions <writing-extensions>` to register + callbacks and configuration values without breaking inheritance. + """ + for key, value in iteritems(attributes): + if not hasattr(self, key): + setattr(self, key, value) + + def overlay(self, block_start_string=missing, block_end_string=missing, + variable_start_string=missing, variable_end_string=missing, + comment_start_string=missing, comment_end_string=missing, + line_statement_prefix=missing, line_comment_prefix=missing, + trim_blocks=missing, lstrip_blocks=missing, + extensions=missing, optimized=missing, + undefined=missing, finalize=missing, autoescape=missing, + loader=missing, cache_size=missing, auto_reload=missing, + bytecode_cache=missing): + """Create a new overlay environment that shares all the data with the + current environment except for cache and the overridden attributes. + Extensions cannot be removed for an overlayed environment. An overlayed + environment automatically gets all the extensions of the environment it + is linked to plus optional extra extensions. + + Creating overlays should happen after the initial environment was set + up completely. Not all attributes are truly linked, some are just + copied over so modifications on the original environment may not shine + through. + """ + args = dict(locals()) + del args['self'], args['cache_size'], args['extensions'] + + rv = object.__new__(self.__class__) + rv.__dict__.update(self.__dict__) + rv.overlayed = True + rv.linked_to = self + + for key, value in iteritems(args): + if value is not missing: + setattr(rv, key, value) + + if cache_size is not missing: + rv.cache = create_cache(cache_size) + else: + rv.cache = copy_cache(self.cache) + + rv.extensions = {} + for key, value in iteritems(self.extensions): + rv.extensions[key] = value.bind(rv) + if extensions is not missing: + rv.extensions.update(load_extensions(rv, extensions)) + + return _environment_sanity_check(rv) + + lexer = property(get_lexer, doc="The lexer for this environment.") + + def iter_extensions(self): + """Iterates over the extensions by priority.""" + return iter(sorted(self.extensions.values(), + key=lambda x: x.priority)) + + def getitem(self, obj, argument): + """Get an item or attribute of an object but prefer the item.""" + try: + return obj[argument] + except (AttributeError, TypeError, LookupError): + if isinstance(argument, string_types): + try: + attr = str(argument) + except Exception: + pass + else: + try: + return getattr(obj, attr) + except AttributeError: + pass + return self.undefined(obj=obj, name=argument) + + def getattr(self, obj, attribute): + """Get an item or attribute of an object but prefer the attribute. + Unlike :meth:`getitem` the attribute *must* be a bytestring. + """ + try: + return getattr(obj, attribute) + except AttributeError: + pass + try: + return obj[attribute] + except (TypeError, LookupError, AttributeError): + return self.undefined(obj=obj, name=attribute) + + def call_filter(self, name, value, args=None, kwargs=None, + context=None, eval_ctx=None): + """Invokes a filter on a value the same way the compiler does it. + + Note that on Python 3 this might return a coroutine in case the + filter is running from an environment in async mode and the filter + supports async execution. It's your responsibility to await this + if needed. + + .. versionadded:: 2.7 + """ + func = self.filters.get(name) + if func is None: + fail_for_missing_callable('no filter named %r', name) + args = [value] + list(args or ()) + if getattr(func, 'contextfilter', False): + if context is None: + raise TemplateRuntimeError('Attempted to invoke context ' + 'filter without context') + args.insert(0, context) + elif getattr(func, 'evalcontextfilter', False): + if eval_ctx is None: + if context is not None: + eval_ctx = context.eval_ctx + else: + eval_ctx = EvalContext(self) + args.insert(0, eval_ctx) + elif getattr(func, 'environmentfilter', False): + args.insert(0, self) + return func(*args, **(kwargs or {})) + + def call_test(self, name, value, args=None, kwargs=None): + """Invokes a test on a value the same way the compiler does it. + + .. versionadded:: 2.7 + """ + func = self.tests.get(name) + if func is None: + fail_for_missing_callable('no test named %r', name) + return func(value, *(args or ()), **(kwargs or {})) + + @internalcode + def parse(self, source, name=None, filename=None): + """Parse the sourcecode and return the abstract syntax tree. This + tree of nodes is used by the compiler to convert the template into + executable source- or bytecode. This is useful for debugging or to + extract information from templates. + + If you are :ref:`developing Jinja2 extensions <writing-extensions>` + this gives you a good overview of the node tree generated. + """ + try: + return self._parse(source, name, filename) + except TemplateSyntaxError: + exc_info = sys.exc_info() + self.handle_exception(exc_info, source_hint=source) + + def _parse(self, source, name, filename): + """Internal parsing function used by `parse` and `compile`.""" + return Parser(self, source, name, encode_filename(filename)).parse() + + def lex(self, source, name=None, filename=None): + """Lex the given sourcecode and return a generator that yields + tokens as tuples in the form ``(lineno, token_type, value)``. + This can be useful for :ref:`extension development <writing-extensions>` + and debugging templates. + + This does not perform preprocessing. If you want the preprocessing + of the extensions to be applied you have to filter source through + the :meth:`preprocess` method. + """ + source = text_type(source) + try: + return self.lexer.tokeniter(source, name, filename) + except TemplateSyntaxError: + exc_info = sys.exc_info() + self.handle_exception(exc_info, source_hint=source) + + def preprocess(self, source, name=None, filename=None): + """Preprocesses the source with all extensions. This is automatically + called for all parsing and compiling methods but *not* for :meth:`lex` + because there you usually only want the actual source tokenized. + """ + return reduce(lambda s, e: e.preprocess(s, name, filename), + self.iter_extensions(), text_type(source)) + + def _tokenize(self, source, name, filename=None, state=None): + """Called by the parser to do the preprocessing and filtering + for all the extensions. Returns a :class:`~jinja2.lexer.TokenStream`. + """ + source = self.preprocess(source, name, filename) + stream = self.lexer.tokenize(source, name, filename, state) + for ext in self.iter_extensions(): + stream = ext.filter_stream(stream) + if not isinstance(stream, TokenStream): + stream = TokenStream(stream, name, filename) + return stream + + def _generate(self, source, name, filename, defer_init=False): + """Internal hook that can be overridden to hook a different generate + method in. + + .. versionadded:: 2.5 + """ + return generate(source, self, name, filename, defer_init=defer_init, + optimized=self.optimized) + + def _compile(self, source, filename): + """Internal hook that can be overridden to hook a different compile + method in. + + .. versionadded:: 2.5 + """ + return compile(source, filename, 'exec') + + @internalcode + def compile(self, source, name=None, filename=None, raw=False, + defer_init=False): + """Compile a node or template source code. The `name` parameter is + the load name of the template after it was joined using + :meth:`join_path` if necessary, not the filename on the file system. + the `filename` parameter is the estimated filename of the template on + the file system. If the template came from a database or memory this + can be omitted. + + The return value of this method is a python code object. If the `raw` + parameter is `True` the return value will be a string with python + code equivalent to the bytecode returned otherwise. This method is + mainly used internally. + + `defer_init` is use internally to aid the module code generator. This + causes the generated code to be able to import without the global + environment variable to be set. + + .. versionadded:: 2.4 + `defer_init` parameter added. + """ + source_hint = None + try: + if isinstance(source, string_types): + source_hint = source + source = self._parse(source, name, filename) + source = self._generate(source, name, filename, + defer_init=defer_init) + if raw: + return source + if filename is None: + filename = '<template>' + else: + filename = encode_filename(filename) + return self._compile(source, filename) + except TemplateSyntaxError: + exc_info = sys.exc_info() + self.handle_exception(exc_info, source_hint=source_hint) + + def compile_expression(self, source, undefined_to_none=True): + """A handy helper method that returns a callable that accepts keyword + arguments that appear as variables in the expression. If called it + returns the result of the expression. + + This is useful if applications want to use the same rules as Jinja + in template "configuration files" or similar situations. + + Example usage: + + >>> env = Environment() + >>> expr = env.compile_expression('foo == 42') + >>> expr(foo=23) + False + >>> expr(foo=42) + True + + Per default the return value is converted to `None` if the + expression returns an undefined value. This can be changed + by setting `undefined_to_none` to `False`. + + >>> env.compile_expression('var')() is None + True + >>> env.compile_expression('var', undefined_to_none=False)() + Undefined + + .. versionadded:: 2.1 + """ + parser = Parser(self, source, state='variable') + exc_info = None + try: + expr = parser.parse_expression() + if not parser.stream.eos: + raise TemplateSyntaxError('chunk after expression', + parser.stream.current.lineno, + None, None) + expr.set_environment(self) + except TemplateSyntaxError: + exc_info = sys.exc_info() + if exc_info is not None: + self.handle_exception(exc_info, source_hint=source) + body = [nodes.Assign(nodes.Name('result', 'store'), expr, lineno=1)] + template = self.from_string(nodes.Template(body, lineno=1)) + return TemplateExpression(template, undefined_to_none) + + def compile_templates(self, target, extensions=None, filter_func=None, + zip='deflated', log_function=None, + ignore_errors=True, py_compile=False): + """Finds all the templates the loader can find, compiles them + and stores them in `target`. If `zip` is `None`, instead of in a + zipfile, the templates will be stored in a directory. + By default a deflate zip algorithm is used. To switch to + the stored algorithm, `zip` can be set to ``'stored'``. + + `extensions` and `filter_func` are passed to :meth:`list_templates`. + Each template returned will be compiled to the target folder or + zipfile. + + By default template compilation errors are ignored. In case a + log function is provided, errors are logged. If you want template + syntax errors to abort the compilation you can set `ignore_errors` + to `False` and you will get an exception on syntax errors. + + If `py_compile` is set to `True` .pyc files will be written to the + target instead of standard .py files. This flag does not do anything + on pypy and Python 3 where pyc files are not picked up by itself and + don't give much benefit. + + .. versionadded:: 2.4 + """ + from jinja2.loaders import ModuleLoader + + if log_function is None: + log_function = lambda x: None + + if py_compile: + if not PY2 or PYPY: + from warnings import warn + warn(Warning('py_compile has no effect on pypy or Python 3')) + py_compile = False + else: + import imp + import marshal + py_header = imp.get_magic() + \ + u'\xff\xff\xff\xff'.encode('iso-8859-15') + + # Python 3.3 added a source filesize to the header + if sys.version_info >= (3, 3): + py_header += u'\x00\x00\x00\x00'.encode('iso-8859-15') + + def write_file(filename, data, mode): + if zip: + info = ZipInfo(filename) + info.external_attr = 0o755 << 16 + zip_file.writestr(info, data) + else: + f = open(os.path.join(target, filename), mode) + try: + f.write(data) + finally: + f.close() + + if zip is not None: + from zipfile import ZipFile, ZipInfo, ZIP_DEFLATED, ZIP_STORED + zip_file = ZipFile(target, 'w', dict(deflated=ZIP_DEFLATED, + stored=ZIP_STORED)[zip]) + log_function('Compiling into Zip archive "%s"' % target) + else: + if not os.path.isdir(target): + os.makedirs(target) + log_function('Compiling into folder "%s"' % target) + + try: + for name in self.list_templates(extensions, filter_func): + source, filename, _ = self.loader.get_source(self, name) + try: + code = self.compile(source, name, filename, True, True) + except TemplateSyntaxError as e: + if not ignore_errors: + raise + log_function('Could not compile "%s": %s' % (name, e)) + continue + + filename = ModuleLoader.get_module_filename(name) + + if py_compile: + c = self._compile(code, encode_filename(filename)) + write_file(filename + 'c', py_header + + marshal.dumps(c), 'wb') + log_function('Byte-compiled "%s" as %s' % + (name, filename + 'c')) + else: + write_file(filename, code, 'w') + log_function('Compiled "%s" as %s' % (name, filename)) + finally: + if zip: + zip_file.close() + + log_function('Finished compiling templates') + + def list_templates(self, extensions=None, filter_func=None): + """Returns a list of templates for this environment. This requires + that the loader supports the loader's + :meth:`~BaseLoader.list_templates` method. + + If there are other files in the template folder besides the + actual templates, the returned list can be filtered. There are two + ways: either `extensions` is set to a list of file extensions for + templates, or a `filter_func` can be provided which is a callable that + is passed a template name and should return `True` if it should end up + in the result list. + + If the loader does not support that, a :exc:`TypeError` is raised. + + .. versionadded:: 2.4 + """ + x = self.loader.list_templates() + if extensions is not None: + if filter_func is not None: + raise TypeError('either extensions or filter_func ' + 'can be passed, but not both') + filter_func = lambda x: '.' in x and \ + x.rsplit('.', 1)[1] in extensions + if filter_func is not None: + x = list(ifilter(filter_func, x)) + return x + + def handle_exception(self, exc_info=None, rendered=False, source_hint=None): + """Exception handling helper. This is used internally to either raise + rewritten exceptions or return a rendered traceback for the template. + """ + global _make_traceback + if exc_info is None: + exc_info = sys.exc_info() + + # the debugging module is imported when it's used for the first time. + # we're doing a lot of stuff there and for applications that do not + # get any exceptions in template rendering there is no need to load + # all of that. + if _make_traceback is None: + from jinja2.debug import make_traceback as _make_traceback + traceback = _make_traceback(exc_info, source_hint) + if rendered and self.exception_formatter is not None: + return self.exception_formatter(traceback) + if self.exception_handler is not None: + self.exception_handler(traceback) + exc_type, exc_value, tb = traceback.standard_exc_info + reraise(exc_type, exc_value, tb) + + def join_path(self, template, parent): + """Join a template with the parent. By default all the lookups are + relative to the loader root so this method returns the `template` + parameter unchanged, but if the paths should be relative to the + parent template, this function can be used to calculate the real + template name. + + Subclasses may override this method and implement template path + joining here. + """ + return template + + @internalcode + def _load_template(self, name, globals): + if self.loader is None: + raise TypeError('no loader for this environment specified') + cache_key = (weakref.ref(self.loader), name) + if self.cache is not None: + template = self.cache.get(cache_key) + if template is not None and (not self.auto_reload or + template.is_up_to_date): + return template + template = self.loader.load(self, name, globals) + if self.cache is not None: + self.cache[cache_key] = template + return template + + @internalcode + def get_template(self, name, parent=None, globals=None): + """Load a template from the loader. If a loader is configured this + method asks the loader for the template and returns a :class:`Template`. + If the `parent` parameter is not `None`, :meth:`join_path` is called + to get the real template name before loading. + + The `globals` parameter can be used to provide template wide globals. + These variables are available in the context at render time. + + If the template does not exist a :exc:`TemplateNotFound` exception is + raised. + + .. versionchanged:: 2.4 + If `name` is a :class:`Template` object it is returned from the + function unchanged. + """ + if isinstance(name, Template): + return name + if parent is not None: + name = self.join_path(name, parent) + return self._load_template(name, self.make_globals(globals)) + + @internalcode + def select_template(self, names, parent=None, globals=None): + """Works like :meth:`get_template` but tries a number of templates + before it fails. If it cannot find any of the templates, it will + raise a :exc:`TemplatesNotFound` exception. + + .. versionadded:: 2.3 + + .. versionchanged:: 2.4 + If `names` contains a :class:`Template` object it is returned + from the function unchanged. + """ + if not names: + raise TemplatesNotFound(message=u'Tried to select from an empty list ' + u'of templates.') + globals = self.make_globals(globals) + for name in names: + if isinstance(name, Template): + return name + if parent is not None: + name = self.join_path(name, parent) + try: + return self._load_template(name, globals) + except TemplateNotFound: + pass + raise TemplatesNotFound(names) + + @internalcode + def get_or_select_template(self, template_name_or_list, + parent=None, globals=None): + """Does a typecheck and dispatches to :meth:`select_template` + if an iterable of template names is given, otherwise to + :meth:`get_template`. + + .. versionadded:: 2.3 + """ + if isinstance(template_name_or_list, string_types): + return self.get_template(template_name_or_list, parent, globals) + elif isinstance(template_name_or_list, Template): + return template_name_or_list + return self.select_template(template_name_or_list, parent, globals) + + def from_string(self, source, globals=None, template_class=None): + """Load a template from a string. This parses the source given and + returns a :class:`Template` object. + """ + globals = self.make_globals(globals) + cls = template_class or self.template_class + return cls.from_code(self, self.compile(source), globals, None) + + def make_globals(self, d): + """Return a dict for the globals.""" + if not d: + return self.globals + return dict(self.globals, **d) + + +class Template(object): + """The central template object. This class represents a compiled template + and is used to evaluate it. + + Normally the template object is generated from an :class:`Environment` but + it also has a constructor that makes it possible to create a template + instance directly using the constructor. It takes the same arguments as + the environment constructor but it's not possible to specify a loader. + + Every template object has a few methods and members that are guaranteed + to exist. However it's important that a template object should be + considered immutable. Modifications on the object are not supported. + + Template objects created from the constructor rather than an environment + do have an `environment` attribute that points to a temporary environment + that is probably shared with other templates created with the constructor + and compatible settings. + + >>> template = Template('Hello {{ name }}!') + >>> template.render(name='John Doe') == u'Hello John Doe!' + True + >>> stream = template.stream(name='John Doe') + >>> next(stream) == u'Hello John Doe!' + True + >>> next(stream) + Traceback (most recent call last): + ... + StopIteration + """ + + def __new__(cls, source, + block_start_string=BLOCK_START_STRING, + block_end_string=BLOCK_END_STRING, + variable_start_string=VARIABLE_START_STRING, + variable_end_string=VARIABLE_END_STRING, + comment_start_string=COMMENT_START_STRING, + comment_end_string=COMMENT_END_STRING, + line_statement_prefix=LINE_STATEMENT_PREFIX, + line_comment_prefix=LINE_COMMENT_PREFIX, + trim_blocks=TRIM_BLOCKS, + lstrip_blocks=LSTRIP_BLOCKS, + newline_sequence=NEWLINE_SEQUENCE, + keep_trailing_newline=KEEP_TRAILING_NEWLINE, + extensions=(), + optimized=True, + undefined=Undefined, + finalize=None, + autoescape=False, + enable_async=False): + env = get_spontaneous_environment( + block_start_string, block_end_string, variable_start_string, + variable_end_string, comment_start_string, comment_end_string, + line_statement_prefix, line_comment_prefix, trim_blocks, + lstrip_blocks, newline_sequence, keep_trailing_newline, + frozenset(extensions), optimized, undefined, finalize, autoescape, + None, 0, False, None, enable_async) + return env.from_string(source, template_class=cls) + + @classmethod + def from_code(cls, environment, code, globals, uptodate=None): + """Creates a template object from compiled code and the globals. This + is used by the loaders and environment to create a template object. + """ + namespace = { + 'environment': environment, + '__file__': code.co_filename + } + exec(code, namespace) + rv = cls._from_namespace(environment, namespace, globals) + rv._uptodate = uptodate + return rv + + @classmethod + def from_module_dict(cls, environment, module_dict, globals): + """Creates a template object from a module. This is used by the + module loader to create a template object. + + .. versionadded:: 2.4 + """ + return cls._from_namespace(environment, module_dict, globals) + + @classmethod + def _from_namespace(cls, environment, namespace, globals): + t = object.__new__(cls) + t.environment = environment + t.globals = globals + t.name = namespace['name'] + t.filename = namespace['__file__'] + t.blocks = namespace['blocks'] + + # render function and module + t.root_render_func = namespace['root'] + t._module = None + + # debug and loader helpers + t._debug_info = namespace['debug_info'] + t._uptodate = None + + # store the reference + namespace['environment'] = environment + namespace['__jinja_template__'] = t + + return t + + def render(self, *args, **kwargs): + """This method accepts the same arguments as the `dict` constructor: + A dict, a dict subclass or some keyword arguments. If no arguments + are given the context will be empty. These two calls do the same:: + + template.render(knights='that say nih') + template.render({'knights': 'that say nih'}) + + This will return the rendered template as unicode string. + """ + vars = dict(*args, **kwargs) + try: + return concat(self.root_render_func(self.new_context(vars))) + except Exception: + exc_info = sys.exc_info() + return self.environment.handle_exception(exc_info, True) + + def render_async(self, *args, **kwargs): + """This works similar to :meth:`render` but returns a coroutine + that when awaited returns the entire rendered template string. This + requires the async feature to be enabled. + + Example usage:: + + await template.render_async(knights='that say nih; asynchronously') + """ + # see asyncsupport for the actual implementation + raise NotImplementedError('This feature is not available for this ' + 'version of Python') + + def stream(self, *args, **kwargs): + """Works exactly like :meth:`generate` but returns a + :class:`TemplateStream`. + """ + return TemplateStream(self.generate(*args, **kwargs)) + + def generate(self, *args, **kwargs): + """For very large templates it can be useful to not render the whole + template at once but evaluate each statement after another and yield + piece for piece. This method basically does exactly that and returns + a generator that yields one item after another as unicode strings. + + It accepts the same arguments as :meth:`render`. + """ + vars = dict(*args, **kwargs) + try: + for event in self.root_render_func(self.new_context(vars)): + yield event + except Exception: + exc_info = sys.exc_info() + else: + return + yield self.environment.handle_exception(exc_info, True) + + def generate_async(self, *args, **kwargs): + """An async version of :meth:`generate`. Works very similarly but + returns an async iterator instead. + """ + # see asyncsupport for the actual implementation + raise NotImplementedError('This feature is not available for this ' + 'version of Python') + + def new_context(self, vars=None, shared=False, locals=None): + """Create a new :class:`Context` for this template. The vars + provided will be passed to the template. Per default the globals + are added to the context. If shared is set to `True` the data + is passed as it to the context without adding the globals. + + `locals` can be a dict of local variables for internal usage. + """ + return new_context(self.environment, self.name, self.blocks, + vars, shared, self.globals, locals) + + def make_module(self, vars=None, shared=False, locals=None): + """This method works like the :attr:`module` attribute when called + without arguments but it will evaluate the template on every call + rather than caching it. It's also possible to provide + a dict which is then used as context. The arguments are the same + as for the :meth:`new_context` method. + """ + return TemplateModule(self, self.new_context(vars, shared, locals)) + + def make_module_async(self, vars=None, shared=False, locals=None): + """As template module creation can invoke template code for + asynchronous exections this method must be used instead of the + normal :meth:`make_module` one. Likewise the module attribute + becomes unavailable in async mode. + """ + # see asyncsupport for the actual implementation + raise NotImplementedError('This feature is not available for this ' + 'version of Python') + + @internalcode + def _get_default_module(self): + if self._module is not None: + return self._module + self._module = rv = self.make_module() + return rv + + @property + def module(self): + """The template as module. This is used for imports in the + template runtime but is also useful if one wants to access + exported template variables from the Python layer: + + >>> t = Template('{% macro foo() %}42{% endmacro %}23') + >>> str(t.module) + '23' + >>> t.module.foo() == u'42' + True + + This attribute is not available if async mode is enabled. + """ + return self._get_default_module() + + def get_corresponding_lineno(self, lineno): + """Return the source line number of a line number in the + generated bytecode as they are not in sync. + """ + for template_line, code_line in reversed(self.debug_info): + if code_line <= lineno: + return template_line + return 1 + + @property + def is_up_to_date(self): + """If this variable is `False` there is a newer version available.""" + if self._uptodate is None: + return True + return self._uptodate() + + @property + def debug_info(self): + """The debug info mapping.""" + return [tuple(imap(int, x.split('='))) for x in + self._debug_info.split('&')] + + def __repr__(self): + if self.name is None: + name = 'memory:%x' % id(self) + else: + name = repr(self.name) + return '<%s %s>' % (self.__class__.__name__, name) + + +@implements_to_string +class TemplateModule(object): + """Represents an imported template. All the exported names of the + template are available as attributes on this object. Additionally + converting it into an unicode- or bytestrings renders the contents. + """ + + def __init__(self, template, context, body_stream=None): + if body_stream is None: + if context.environment.is_async: + raise RuntimeError('Async mode requires a body stream ' + 'to be passed to a template module. Use ' + 'the async methods of the API you are ' + 'using.') + body_stream = list(template.root_render_func(context)) + self._body_stream = body_stream + self.__dict__.update(context.get_exported()) + self.__name__ = template.name + + def __html__(self): + return Markup(concat(self._body_stream)) + + def __str__(self): + return concat(self._body_stream) + + def __repr__(self): + if self.__name__ is None: + name = 'memory:%x' % id(self) + else: + name = repr(self.__name__) + return '<%s %s>' % (self.__class__.__name__, name) + + +class TemplateExpression(object): + """The :meth:`jinja2.Environment.compile_expression` method returns an + instance of this object. It encapsulates the expression-like access + to the template with an expression it wraps. + """ + + def __init__(self, template, undefined_to_none): + self._template = template + self._undefined_to_none = undefined_to_none + + def __call__(self, *args, **kwargs): + context = self._template.new_context(dict(*args, **kwargs)) + consume(self._template.root_render_func(context)) + rv = context.vars['result'] + if self._undefined_to_none and isinstance(rv, Undefined): + rv = None + return rv + + +@implements_iterator +class TemplateStream(object): + """A template stream works pretty much like an ordinary python generator + but it can buffer multiple items to reduce the number of total iterations. + Per default the output is unbuffered which means that for every unbuffered + instruction in the template one unicode string is yielded. + + If buffering is enabled with a buffer size of 5, five items are combined + into a new unicode string. This is mainly useful if you are streaming + big templates to a client via WSGI which flushes after each iteration. + """ + + def __init__(self, gen): + self._gen = gen + self.disable_buffering() + + def dump(self, fp, encoding=None, errors='strict'): + """Dump the complete stream into a file or file-like object. + Per default unicode strings are written, if you want to encode + before writing specify an `encoding`. + + Example usage:: + + Template('Hello {{ name }}!').stream(name='foo').dump('hello.html') + """ + close = False + if isinstance(fp, string_types): + if encoding is None: + encoding = 'utf-8' + fp = open(fp, 'wb') + close = True + try: + if encoding is not None: + iterable = (x.encode(encoding, errors) for x in self) + else: + iterable = self + if hasattr(fp, 'writelines'): + fp.writelines(iterable) + else: + for item in iterable: + fp.write(item) + finally: + if close: + fp.close() + + def disable_buffering(self): + """Disable the output buffering.""" + self._next = partial(next, self._gen) + self.buffered = False + + def _buffered_generator(self, size): + buf = [] + c_size = 0 + push = buf.append + + while 1: + try: + while c_size < size: + c = next(self._gen) + push(c) + if c: + c_size += 1 + except StopIteration: + if not c_size: + return + yield concat(buf) + del buf[:] + c_size = 0 + + def enable_buffering(self, size=5): + """Enable buffering. Buffer `size` items before yielding them.""" + if size <= 1: + raise ValueError('buffer size too small') + + self.buffered = True + self._next = partial(next, self._buffered_generator(size)) + + def __iter__(self): + return self + + def __next__(self): + return self._next() + + +# hook in default template class. if anyone reads this comment: ignore that +# it's possible to use custom templates ;-) +Environment.template_class = Template diff --git a/python/jinja2/exceptions.py b/python/jinja2/exceptions.py new file mode 100644 index 0000000..c018a33 --- /dev/null +++ b/python/jinja2/exceptions.py @@ -0,0 +1,146 @@ +# -*- coding: utf-8 -*- +""" + jinja2.exceptions + ~~~~~~~~~~~~~~~~~ + + Jinja exceptions. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +from jinja2._compat import imap, text_type, PY2, implements_to_string + + +class TemplateError(Exception): + """Baseclass for all template errors.""" + + if PY2: + def __init__(self, message=None): + if message is not None: + message = text_type(message).encode('utf-8') + Exception.__init__(self, message) + + @property + def message(self): + if self.args: + message = self.args[0] + if message is not None: + return message.decode('utf-8', 'replace') + + def __unicode__(self): + return self.message or u'' + else: + def __init__(self, message=None): + Exception.__init__(self, message) + + @property + def message(self): + if self.args: + message = self.args[0] + if message is not None: + return message + + +@implements_to_string +class TemplateNotFound(IOError, LookupError, TemplateError): + """Raised if a template does not exist.""" + + # looks weird, but removes the warning descriptor that just + # bogusly warns us about message being deprecated + message = None + + def __init__(self, name, message=None): + IOError.__init__(self) + if message is None: + message = name + self.message = message + self.name = name + self.templates = [name] + + def __str__(self): + return self.message + + +class TemplatesNotFound(TemplateNotFound): + """Like :class:`TemplateNotFound` but raised if multiple templates + are selected. This is a subclass of :class:`TemplateNotFound` + exception, so just catching the base exception will catch both. + + .. versionadded:: 2.2 + """ + + def __init__(self, names=(), message=None): + if message is None: + message = u'none of the templates given were found: ' + \ + u', '.join(imap(text_type, names)) + TemplateNotFound.__init__(self, names and names[-1] or None, message) + self.templates = list(names) + + +@implements_to_string +class TemplateSyntaxError(TemplateError): + """Raised to tell the user that there is a problem with the template.""" + + def __init__(self, message, lineno, name=None, filename=None): + TemplateError.__init__(self, message) + self.lineno = lineno + self.name = name + self.filename = filename + self.source = None + + # this is set to True if the debug.translate_syntax_error + # function translated the syntax error into a new traceback + self.translated = False + + def __str__(self): + # for translated errors we only return the message + if self.translated: + return self.message + + # otherwise attach some stuff + location = 'line %d' % self.lineno + name = self.filename or self.name + if name: + location = 'File "%s", %s' % (name, location) + lines = [self.message, ' ' + location] + + # if the source is set, add the line to the output + if self.source is not None: + try: + line = self.source.splitlines()[self.lineno - 1] + except IndexError: + line = None + if line: + lines.append(' ' + line.strip()) + + return u'\n'.join(lines) + + +class TemplateAssertionError(TemplateSyntaxError): + """Like a template syntax error, but covers cases where something in the + template caused an error at compile time that wasn't necessarily caused + by a syntax error. However it's a direct subclass of + :exc:`TemplateSyntaxError` and has the same attributes. + """ + + +class TemplateRuntimeError(TemplateError): + """A generic runtime error in the template engine. Under some situations + Jinja may raise this exception. + """ + + +class UndefinedError(TemplateRuntimeError): + """Raised if a template tries to operate on :class:`Undefined`.""" + + +class SecurityError(TemplateRuntimeError): + """Raised if a template tries to do something insecure if the + sandbox is enabled. + """ + + +class FilterArgumentError(TemplateRuntimeError): + """This error is raised if a filter was called with inappropriate + arguments + """ diff --git a/python/jinja2/ext.py b/python/jinja2/ext.py new file mode 100644 index 0000000..0734a84 --- /dev/null +++ b/python/jinja2/ext.py @@ -0,0 +1,627 @@ +# -*- coding: utf-8 -*- +""" + jinja2.ext + ~~~~~~~~~~ + + Jinja extensions allow to add custom tags similar to the way django custom + tags work. By default two example extensions exist: an i18n and a cache + extension. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD. +""" +import re + +from jinja2 import nodes +from jinja2.defaults import BLOCK_START_STRING, \ + BLOCK_END_STRING, VARIABLE_START_STRING, VARIABLE_END_STRING, \ + COMMENT_START_STRING, COMMENT_END_STRING, LINE_STATEMENT_PREFIX, \ + LINE_COMMENT_PREFIX, TRIM_BLOCKS, NEWLINE_SEQUENCE, \ + KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS +from jinja2.environment import Environment +from jinja2.runtime import concat +from jinja2.exceptions import TemplateAssertionError, TemplateSyntaxError +from jinja2.utils import contextfunction, import_string, Markup +from jinja2._compat import with_metaclass, string_types, iteritems + + +# the only real useful gettext functions for a Jinja template. Note +# that ugettext must be assigned to gettext as Jinja doesn't support +# non unicode strings. +GETTEXT_FUNCTIONS = ('_', 'gettext', 'ngettext') + + +class ExtensionRegistry(type): + """Gives the extension an unique identifier.""" + + def __new__(cls, name, bases, d): + rv = type.__new__(cls, name, bases, d) + rv.identifier = rv.__module__ + '.' + rv.__name__ + return rv + + +class Extension(with_metaclass(ExtensionRegistry, object)): + """Extensions can be used to add extra functionality to the Jinja template + system at the parser level. Custom extensions are bound to an environment + but may not store environment specific data on `self`. The reason for + this is that an extension can be bound to another environment (for + overlays) by creating a copy and reassigning the `environment` attribute. + + As extensions are created by the environment they cannot accept any + arguments for configuration. One may want to work around that by using + a factory function, but that is not possible as extensions are identified + by their import name. The correct way to configure the extension is + storing the configuration values on the environment. Because this way the + environment ends up acting as central configuration storage the + attributes may clash which is why extensions have to ensure that the names + they choose for configuration are not too generic. ``prefix`` for example + is a terrible name, ``fragment_cache_prefix`` on the other hand is a good + name as includes the name of the extension (fragment cache). + """ + + #: if this extension parses this is the list of tags it's listening to. + tags = set() + + #: the priority of that extension. This is especially useful for + #: extensions that preprocess values. A lower value means higher + #: priority. + #: + #: .. versionadded:: 2.4 + priority = 100 + + def __init__(self, environment): + self.environment = environment + + def bind(self, environment): + """Create a copy of this extension bound to another environment.""" + rv = object.__new__(self.__class__) + rv.__dict__.update(self.__dict__) + rv.environment = environment + return rv + + def preprocess(self, source, name, filename=None): + """This method is called before the actual lexing and can be used to + preprocess the source. The `filename` is optional. The return value + must be the preprocessed source. + """ + return source + + def filter_stream(self, stream): + """It's passed a :class:`~jinja2.lexer.TokenStream` that can be used + to filter tokens returned. This method has to return an iterable of + :class:`~jinja2.lexer.Token`\\s, but it doesn't have to return a + :class:`~jinja2.lexer.TokenStream`. + + In the `ext` folder of the Jinja2 source distribution there is a file + called `inlinegettext.py` which implements a filter that utilizes this + method. + """ + return stream + + def parse(self, parser): + """If any of the :attr:`tags` matched this method is called with the + parser as first argument. The token the parser stream is pointing at + is the name token that matched. This method has to return one or a + list of multiple nodes. + """ + raise NotImplementedError() + + def attr(self, name, lineno=None): + """Return an attribute node for the current extension. This is useful + to pass constants on extensions to generated template code. + + :: + + self.attr('_my_attribute', lineno=lineno) + """ + return nodes.ExtensionAttribute(self.identifier, name, lineno=lineno) + + def call_method(self, name, args=None, kwargs=None, dyn_args=None, + dyn_kwargs=None, lineno=None): + """Call a method of the extension. This is a shortcut for + :meth:`attr` + :class:`jinja2.nodes.Call`. + """ + if args is None: + args = [] + if kwargs is None: + kwargs = [] + return nodes.Call(self.attr(name, lineno=lineno), args, kwargs, + dyn_args, dyn_kwargs, lineno=lineno) + + +@contextfunction +def _gettext_alias(__context, *args, **kwargs): + return __context.call(__context.resolve('gettext'), *args, **kwargs) + + +def _make_new_gettext(func): + @contextfunction + def gettext(__context, __string, **variables): + rv = __context.call(func, __string) + if __context.eval_ctx.autoescape: + rv = Markup(rv) + return rv % variables + return gettext + + +def _make_new_ngettext(func): + @contextfunction + def ngettext(__context, __singular, __plural, __num, **variables): + variables.setdefault('num', __num) + rv = __context.call(func, __singular, __plural, __num) + if __context.eval_ctx.autoescape: + rv = Markup(rv) + return rv % variables + return ngettext + + +class InternationalizationExtension(Extension): + """This extension adds gettext support to Jinja2.""" + tags = set(['trans']) + + # TODO: the i18n extension is currently reevaluating values in a few + # situations. Take this example: + # {% trans count=something() %}{{ count }} foo{% pluralize + # %}{{ count }} fooss{% endtrans %} + # something is called twice here. One time for the gettext value and + # the other time for the n-parameter of the ngettext function. + + def __init__(self, environment): + Extension.__init__(self, environment) + environment.globals['_'] = _gettext_alias + environment.extend( + install_gettext_translations=self._install, + install_null_translations=self._install_null, + install_gettext_callables=self._install_callables, + uninstall_gettext_translations=self._uninstall, + extract_translations=self._extract, + newstyle_gettext=False + ) + + def _install(self, translations, newstyle=None): + gettext = getattr(translations, 'ugettext', None) + if gettext is None: + gettext = translations.gettext + ngettext = getattr(translations, 'ungettext', None) + if ngettext is None: + ngettext = translations.ngettext + self._install_callables(gettext, ngettext, newstyle) + + def _install_null(self, newstyle=None): + self._install_callables( + lambda x: x, + lambda s, p, n: (n != 1 and (p,) or (s,))[0], + newstyle + ) + + def _install_callables(self, gettext, ngettext, newstyle=None): + if newstyle is not None: + self.environment.newstyle_gettext = newstyle + if self.environment.newstyle_gettext: + gettext = _make_new_gettext(gettext) + ngettext = _make_new_ngettext(ngettext) + self.environment.globals.update( + gettext=gettext, + ngettext=ngettext + ) + + def _uninstall(self, translations): + for key in 'gettext', 'ngettext': + self.environment.globals.pop(key, None) + + def _extract(self, source, gettext_functions=GETTEXT_FUNCTIONS): + if isinstance(source, string_types): + source = self.environment.parse(source) + return extract_from_ast(source, gettext_functions) + + def parse(self, parser): + """Parse a translatable tag.""" + lineno = next(parser.stream).lineno + num_called_num = False + + # find all the variables referenced. Additionally a variable can be + # defined in the body of the trans block too, but this is checked at + # a later state. + plural_expr = None + plural_expr_assignment = None + variables = {} + trimmed = None + while parser.stream.current.type != 'block_end': + if variables: + parser.stream.expect('comma') + + # skip colon for python compatibility + if parser.stream.skip_if('colon'): + break + + name = parser.stream.expect('name') + if name.value in variables: + parser.fail('translatable variable %r defined twice.' % + name.value, name.lineno, + exc=TemplateAssertionError) + + # expressions + if parser.stream.current.type == 'assign': + next(parser.stream) + variables[name.value] = var = parser.parse_expression() + elif trimmed is None and name.value in ('trimmed', 'notrimmed'): + trimmed = name.value == 'trimmed' + continue + else: + variables[name.value] = var = nodes.Name(name.value, 'load') + + if plural_expr is None: + if isinstance(var, nodes.Call): + plural_expr = nodes.Name('_trans', 'load') + variables[name.value] = plural_expr + plural_expr_assignment = nodes.Assign( + nodes.Name('_trans', 'store'), var) + else: + plural_expr = var + num_called_num = name.value == 'num' + + parser.stream.expect('block_end') + + plural = None + have_plural = False + referenced = set() + + # now parse until endtrans or pluralize + singular_names, singular = self._parse_block(parser, True) + if singular_names: + referenced.update(singular_names) + if plural_expr is None: + plural_expr = nodes.Name(singular_names[0], 'load') + num_called_num = singular_names[0] == 'num' + + # if we have a pluralize block, we parse that too + if parser.stream.current.test('name:pluralize'): + have_plural = True + next(parser.stream) + if parser.stream.current.type != 'block_end': + name = parser.stream.expect('name') + if name.value not in variables: + parser.fail('unknown variable %r for pluralization' % + name.value, name.lineno, + exc=TemplateAssertionError) + plural_expr = variables[name.value] + num_called_num = name.value == 'num' + parser.stream.expect('block_end') + plural_names, plural = self._parse_block(parser, False) + next(parser.stream) + referenced.update(plural_names) + else: + next(parser.stream) + + # register free names as simple name expressions + for var in referenced: + if var not in variables: + variables[var] = nodes.Name(var, 'load') + + if not have_plural: + plural_expr = None + elif plural_expr is None: + parser.fail('pluralize without variables', lineno) + + if trimmed is None: + trimmed = self.environment.policies['ext.i18n.trimmed'] + if trimmed: + singular = self._trim_whitespace(singular) + if plural: + plural = self._trim_whitespace(plural) + + node = self._make_node(singular, plural, variables, plural_expr, + bool(referenced), + num_called_num and have_plural) + node.set_lineno(lineno) + if plural_expr_assignment is not None: + return [plural_expr_assignment, node] + else: + return node + + def _trim_whitespace(self, string, _ws_re=re.compile(r'\s*\n\s*')): + return _ws_re.sub(' ', string.strip()) + + def _parse_block(self, parser, allow_pluralize): + """Parse until the next block tag with a given name.""" + referenced = [] + buf = [] + while 1: + if parser.stream.current.type == 'data': + buf.append(parser.stream.current.value.replace('%', '%%')) + next(parser.stream) + elif parser.stream.current.type == 'variable_begin': + next(parser.stream) + name = parser.stream.expect('name').value + referenced.append(name) + buf.append('%%(%s)s' % name) + parser.stream.expect('variable_end') + elif parser.stream.current.type == 'block_begin': + next(parser.stream) + if parser.stream.current.test('name:endtrans'): + break + elif parser.stream.current.test('name:pluralize'): + if allow_pluralize: + break + parser.fail('a translatable section can have only one ' + 'pluralize section') + parser.fail('control structures in translatable sections are ' + 'not allowed') + elif parser.stream.eos: + parser.fail('unclosed translation block') + else: + assert False, 'internal parser error' + + return referenced, concat(buf) + + def _make_node(self, singular, plural, variables, plural_expr, + vars_referenced, num_called_num): + """Generates a useful node from the data provided.""" + # no variables referenced? no need to escape for old style + # gettext invocations only if there are vars. + if not vars_referenced and not self.environment.newstyle_gettext: + singular = singular.replace('%%', '%') + if plural: + plural = plural.replace('%%', '%') + + # singular only: + if plural_expr is None: + gettext = nodes.Name('gettext', 'load') + node = nodes.Call(gettext, [nodes.Const(singular)], + [], None, None) + + # singular and plural + else: + ngettext = nodes.Name('ngettext', 'load') + node = nodes.Call(ngettext, [ + nodes.Const(singular), + nodes.Const(plural), + plural_expr + ], [], None, None) + + # in case newstyle gettext is used, the method is powerful + # enough to handle the variable expansion and autoescape + # handling itself + if self.environment.newstyle_gettext: + for key, value in iteritems(variables): + # the function adds that later anyways in case num was + # called num, so just skip it. + if num_called_num and key == 'num': + continue + node.kwargs.append(nodes.Keyword(key, value)) + + # otherwise do that here + else: + # mark the return value as safe if we are in an + # environment with autoescaping turned on + node = nodes.MarkSafeIfAutoescape(node) + if variables: + node = nodes.Mod(node, nodes.Dict([ + nodes.Pair(nodes.Const(key), value) + for key, value in variables.items() + ])) + return nodes.Output([node]) + + +class ExprStmtExtension(Extension): + """Adds a `do` tag to Jinja2 that works like the print statement just + that it doesn't print the return value. + """ + tags = set(['do']) + + def parse(self, parser): + node = nodes.ExprStmt(lineno=next(parser.stream).lineno) + node.node = parser.parse_tuple() + return node + + +class LoopControlExtension(Extension): + """Adds break and continue to the template engine.""" + tags = set(['break', 'continue']) + + def parse(self, parser): + token = next(parser.stream) + if token.value == 'break': + return nodes.Break(lineno=token.lineno) + return nodes.Continue(lineno=token.lineno) + + +class WithExtension(Extension): + pass + + +class AutoEscapeExtension(Extension): + pass + + +def extract_from_ast(node, gettext_functions=GETTEXT_FUNCTIONS, + babel_style=True): + """Extract localizable strings from the given template node. Per + default this function returns matches in babel style that means non string + parameters as well as keyword arguments are returned as `None`. This + allows Babel to figure out what you really meant if you are using + gettext functions that allow keyword arguments for placeholder expansion. + If you don't want that behavior set the `babel_style` parameter to `False` + which causes only strings to be returned and parameters are always stored + in tuples. As a consequence invalid gettext calls (calls without a single + string parameter or string parameters after non-string parameters) are + skipped. + + This example explains the behavior: + + >>> from jinja2 import Environment + >>> env = Environment() + >>> node = env.parse('{{ (_("foo"), _(), ngettext("foo", "bar", 42)) }}') + >>> list(extract_from_ast(node)) + [(1, '_', 'foo'), (1, '_', ()), (1, 'ngettext', ('foo', 'bar', None))] + >>> list(extract_from_ast(node, babel_style=False)) + [(1, '_', ('foo',)), (1, 'ngettext', ('foo', 'bar'))] + + For every string found this function yields a ``(lineno, function, + message)`` tuple, where: + + * ``lineno`` is the number of the line on which the string was found, + * ``function`` is the name of the ``gettext`` function used (if the + string was extracted from embedded Python code), and + * ``message`` is the string itself (a ``unicode`` object, or a tuple + of ``unicode`` objects for functions with multiple string arguments). + + This extraction function operates on the AST and is because of that unable + to extract any comments. For comment support you have to use the babel + extraction interface or extract comments yourself. + """ + for node in node.find_all(nodes.Call): + if not isinstance(node.node, nodes.Name) or \ + node.node.name not in gettext_functions: + continue + + strings = [] + for arg in node.args: + if isinstance(arg, nodes.Const) and \ + isinstance(arg.value, string_types): + strings.append(arg.value) + else: + strings.append(None) + + for arg in node.kwargs: + strings.append(None) + if node.dyn_args is not None: + strings.append(None) + if node.dyn_kwargs is not None: + strings.append(None) + + if not babel_style: + strings = tuple(x for x in strings if x is not None) + if not strings: + continue + else: + if len(strings) == 1: + strings = strings[0] + else: + strings = tuple(strings) + yield node.lineno, node.node.name, strings + + +class _CommentFinder(object): + """Helper class to find comments in a token stream. Can only + find comments for gettext calls forwards. Once the comment + from line 4 is found, a comment for line 1 will not return a + usable value. + """ + + def __init__(self, tokens, comment_tags): + self.tokens = tokens + self.comment_tags = comment_tags + self.offset = 0 + self.last_lineno = 0 + + def find_backwards(self, offset): + try: + for _, token_type, token_value in \ + reversed(self.tokens[self.offset:offset]): + if token_type in ('comment', 'linecomment'): + try: + prefix, comment = token_value.split(None, 1) + except ValueError: + continue + if prefix in self.comment_tags: + return [comment.rstrip()] + return [] + finally: + self.offset = offset + + def find_comments(self, lineno): + if not self.comment_tags or self.last_lineno > lineno: + return [] + for idx, (token_lineno, _, _) in enumerate(self.tokens[self.offset:]): + if token_lineno > lineno: + return self.find_backwards(self.offset + idx) + return self.find_backwards(len(self.tokens)) + + +def babel_extract(fileobj, keywords, comment_tags, options): + """Babel extraction method for Jinja templates. + + .. versionchanged:: 2.3 + Basic support for translation comments was added. If `comment_tags` + is now set to a list of keywords for extraction, the extractor will + try to find the best preceeding comment that begins with one of the + keywords. For best results, make sure to not have more than one + gettext call in one line of code and the matching comment in the + same line or the line before. + + .. versionchanged:: 2.5.1 + The `newstyle_gettext` flag can be set to `True` to enable newstyle + gettext calls. + + .. versionchanged:: 2.7 + A `silent` option can now be provided. If set to `False` template + syntax errors are propagated instead of being ignored. + + :param fileobj: the file-like object the messages should be extracted from + :param keywords: a list of keywords (i.e. function names) that should be + recognized as translation functions + :param comment_tags: a list of translator tags to search for and include + in the results. + :param options: a dictionary of additional options (optional) + :return: an iterator over ``(lineno, funcname, message, comments)`` tuples. + (comments will be empty currently) + """ + extensions = set() + for extension in options.get('extensions', '').split(','): + extension = extension.strip() + if not extension: + continue + extensions.add(import_string(extension)) + if InternationalizationExtension not in extensions: + extensions.add(InternationalizationExtension) + + def getbool(options, key, default=False): + return options.get(key, str(default)).lower() in \ + ('1', 'on', 'yes', 'true') + + silent = getbool(options, 'silent', True) + environment = Environment( + options.get('block_start_string', BLOCK_START_STRING), + options.get('block_end_string', BLOCK_END_STRING), + options.get('variable_start_string', VARIABLE_START_STRING), + options.get('variable_end_string', VARIABLE_END_STRING), + options.get('comment_start_string', COMMENT_START_STRING), + options.get('comment_end_string', COMMENT_END_STRING), + options.get('line_statement_prefix') or LINE_STATEMENT_PREFIX, + options.get('line_comment_prefix') or LINE_COMMENT_PREFIX, + getbool(options, 'trim_blocks', TRIM_BLOCKS), + getbool(options, 'lstrip_blocks', LSTRIP_BLOCKS), + NEWLINE_SEQUENCE, + getbool(options, 'keep_trailing_newline', KEEP_TRAILING_NEWLINE), + frozenset(extensions), + cache_size=0, + auto_reload=False + ) + + if getbool(options, 'trimmed'): + environment.policies['ext.i18n.trimmed'] = True + if getbool(options, 'newstyle_gettext'): + environment.newstyle_gettext = True + + source = fileobj.read().decode(options.get('encoding', 'utf-8')) + try: + node = environment.parse(source) + tokens = list(environment.lex(environment.preprocess(source))) + except TemplateSyntaxError as e: + if not silent: + raise + # skip templates with syntax errors + return + + finder = _CommentFinder(tokens, comment_tags) + for lineno, func, message in extract_from_ast(node, keywords): + yield lineno, func, message, finder.find_comments(lineno) + + +#: nicer import names +i18n = InternationalizationExtension +do = ExprStmtExtension +loopcontrols = LoopControlExtension +with_ = WithExtension +autoescape = AutoEscapeExtension diff --git a/python/jinja2/filters.py b/python/jinja2/filters.py new file mode 100644 index 0000000..267dddd --- /dev/null +++ b/python/jinja2/filters.py @@ -0,0 +1,1190 @@ +# -*- coding: utf-8 -*- +""" + jinja2.filters + ~~~~~~~~~~~~~~ + + Bundled jinja filters. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import re +import math +import random +import warnings + +from itertools import groupby, chain +from collections import namedtuple +from jinja2.utils import Markup, escape, pformat, urlize, soft_unicode, \ + unicode_urlencode, htmlsafe_json_dumps +from jinja2.runtime import Undefined +from jinja2.exceptions import FilterArgumentError +from jinja2._compat import imap, string_types, text_type, iteritems, PY2 + + +_word_re = re.compile(r'\w+', re.UNICODE) +_word_beginning_split_re = re.compile(r'([-\s\(\{\[\<]+)', re.UNICODE) + + +def contextfilter(f): + """Decorator for marking context dependent filters. The current + :class:`Context` will be passed as first argument. + """ + f.contextfilter = True + return f + + +def evalcontextfilter(f): + """Decorator for marking eval-context dependent filters. An eval + context object is passed as first argument. For more information + about the eval context, see :ref:`eval-context`. + + .. versionadded:: 2.4 + """ + f.evalcontextfilter = True + return f + + +def environmentfilter(f): + """Decorator for marking environment dependent filters. The current + :class:`Environment` is passed to the filter as first argument. + """ + f.environmentfilter = True + return f + + +def ignore_case(value): + """For use as a postprocessor for :func:`make_attrgetter`. Converts strings + to lowercase and returns other types as-is.""" + return value.lower() if isinstance(value, string_types) else value + + +def make_attrgetter(environment, attribute, postprocess=None): + """Returns a callable that looks up the given attribute from a + passed object with the rules of the environment. Dots are allowed + to access attributes of attributes. Integer parts in paths are + looked up as integers. + """ + if attribute is None: + attribute = [] + elif isinstance(attribute, string_types): + attribute = [int(x) if x.isdigit() else x for x in attribute.split('.')] + else: + attribute = [attribute] + + def attrgetter(item): + for part in attribute: + item = environment.getitem(item, part) + + if postprocess is not None: + item = postprocess(item) + + return item + + return attrgetter + + +def do_forceescape(value): + """Enforce HTML escaping. This will probably double escape variables.""" + if hasattr(value, '__html__'): + value = value.__html__() + return escape(text_type(value)) + + +def do_urlencode(value): + """Escape strings for use in URLs (uses UTF-8 encoding). It accepts both + dictionaries and regular strings as well as pairwise iterables. + + .. versionadded:: 2.7 + """ + itemiter = None + if isinstance(value, dict): + itemiter = iteritems(value) + elif not isinstance(value, string_types): + try: + itemiter = iter(value) + except TypeError: + pass + if itemiter is None: + return unicode_urlencode(value) + return u'&'.join(unicode_urlencode(k) + '=' + + unicode_urlencode(v, for_qs=True) + for k, v in itemiter) + + +@evalcontextfilter +def do_replace(eval_ctx, s, old, new, count=None): + """Return a copy of the value with all occurrences of a substring + replaced with a new one. The first argument is the substring + that should be replaced, the second is the replacement string. + If the optional third argument ``count`` is given, only the first + ``count`` occurrences are replaced: + + .. sourcecode:: jinja + + {{ "Hello World"|replace("Hello", "Goodbye") }} + -> Goodbye World + + {{ "aaaaargh"|replace("a", "d'oh, ", 2) }} + -> d'oh, d'oh, aaargh + """ + if count is None: + count = -1 + if not eval_ctx.autoescape: + return text_type(s).replace(text_type(old), text_type(new), count) + if hasattr(old, '__html__') or hasattr(new, '__html__') and \ + not hasattr(s, '__html__'): + s = escape(s) + else: + s = soft_unicode(s) + return s.replace(soft_unicode(old), soft_unicode(new), count) + + +def do_upper(s): + """Convert a value to uppercase.""" + return soft_unicode(s).upper() + + +def do_lower(s): + """Convert a value to lowercase.""" + return soft_unicode(s).lower() + + +@evalcontextfilter +def do_xmlattr(_eval_ctx, d, autospace=True): + """Create an SGML/XML attribute string based on the items in a dict. + All values that are neither `none` nor `undefined` are automatically + escaped: + + .. sourcecode:: html+jinja + + <ul{{ {'class': 'my_list', 'missing': none, + 'id': 'list-%d'|format(variable)}|xmlattr }}> + ... + </ul> + + Results in something like this: + + .. sourcecode:: html + + <ul class="my_list" id="list-42"> + ... + </ul> + + As you can see it automatically prepends a space in front of the item + if the filter returned something unless the second parameter is false. + """ + rv = u' '.join( + u'%s="%s"' % (escape(key), escape(value)) + for key, value in iteritems(d) + if value is not None and not isinstance(value, Undefined) + ) + if autospace and rv: + rv = u' ' + rv + if _eval_ctx.autoescape: + rv = Markup(rv) + return rv + + +def do_capitalize(s): + """Capitalize a value. The first character will be uppercase, all others + lowercase. + """ + return soft_unicode(s).capitalize() + + +def do_title(s): + """Return a titlecased version of the value. I.e. words will start with + uppercase letters, all remaining characters are lowercase. + """ + return ''.join( + [item[0].upper() + item[1:].lower() + for item in _word_beginning_split_re.split(soft_unicode(s)) + if item]) + + +def do_dictsort(value, case_sensitive=False, by='key', reverse=False): + """Sort a dict and yield (key, value) pairs. Because python dicts are + unsorted you may want to use this function to order them by either + key or value: + + .. sourcecode:: jinja + + {% for item in mydict|dictsort %} + sort the dict by key, case insensitive + + {% for item in mydict|dictsort(reverse=true) %} + sort the dict by key, case insensitive, reverse order + + {% for item in mydict|dictsort(true) %} + sort the dict by key, case sensitive + + {% for item in mydict|dictsort(false, 'value') %} + sort the dict by value, case insensitive + """ + if by == 'key': + pos = 0 + elif by == 'value': + pos = 1 + else: + raise FilterArgumentError( + 'You can only sort by either "key" or "value"' + ) + + def sort_func(item): + value = item[pos] + + if not case_sensitive: + value = ignore_case(value) + + return value + + return sorted(value.items(), key=sort_func, reverse=reverse) + + +@environmentfilter +def do_sort( + environment, value, reverse=False, case_sensitive=False, attribute=None +): + """Sort an iterable. Per default it sorts ascending, if you pass it + true as first argument it will reverse the sorting. + + If the iterable is made of strings the third parameter can be used to + control the case sensitiveness of the comparison which is disabled by + default. + + .. sourcecode:: jinja + + {% for item in iterable|sort %} + ... + {% endfor %} + + It is also possible to sort by an attribute (for example to sort + by the date of an object) by specifying the `attribute` parameter: + + .. sourcecode:: jinja + + {% for item in iterable|sort(attribute='date') %} + ... + {% endfor %} + + .. versionchanged:: 2.6 + The `attribute` parameter was added. + """ + key_func = make_attrgetter( + environment, attribute, + postprocess=ignore_case if not case_sensitive else None + ) + return sorted(value, key=key_func, reverse=reverse) + + +@environmentfilter +def do_unique(environment, value, case_sensitive=False, attribute=None): + """Returns a list of unique items from the the given iterable. + + .. sourcecode:: jinja + + {{ ['foo', 'bar', 'foobar', 'FooBar']|unique }} + -> ['foo', 'bar', 'foobar'] + + The unique items are yielded in the same order as their first occurrence in + the iterable passed to the filter. + + :param case_sensitive: Treat upper and lower case strings as distinct. + :param attribute: Filter objects with unique values for this attribute. + """ + getter = make_attrgetter( + environment, attribute, + postprocess=ignore_case if not case_sensitive else None + ) + seen = set() + + for item in value: + key = getter(item) + + if key not in seen: + seen.add(key) + yield item + + +def _min_or_max(environment, value, func, case_sensitive, attribute): + it = iter(value) + + try: + first = next(it) + except StopIteration: + return environment.undefined('No aggregated item, sequence was empty.') + + key_func = make_attrgetter( + environment, attribute, + ignore_case if not case_sensitive else None + ) + return func(chain([first], it), key=key_func) + + +@environmentfilter +def do_min(environment, value, case_sensitive=False, attribute=None): + """Return the smallest item from the sequence. + + .. sourcecode:: jinja + + {{ [1, 2, 3]|min }} + -> 1 + + :param case_sensitive: Treat upper and lower case strings as distinct. + :param attribute: Get the object with the max value of this attribute. + """ + return _min_or_max(environment, value, min, case_sensitive, attribute) + + +@environmentfilter +def do_max(environment, value, case_sensitive=False, attribute=None): + """Return the largest item from the sequence. + + .. sourcecode:: jinja + + {{ [1, 2, 3]|max }} + -> 3 + + :param case_sensitive: Treat upper and lower case strings as distinct. + :param attribute: Get the object with the max value of this attribute. + """ + return _min_or_max(environment, value, max, case_sensitive, attribute) + + +def do_default(value, default_value=u'', boolean=False): + """If the value is undefined it will return the passed default value, + otherwise the value of the variable: + + .. sourcecode:: jinja + + {{ my_variable|default('my_variable is not defined') }} + + This will output the value of ``my_variable`` if the variable was + defined, otherwise ``'my_variable is not defined'``. If you want + to use default with variables that evaluate to false you have to + set the second parameter to `true`: + + .. sourcecode:: jinja + + {{ ''|default('the string was empty', true) }} + """ + if isinstance(value, Undefined) or (boolean and not value): + return default_value + return value + + +@evalcontextfilter +def do_join(eval_ctx, value, d=u'', attribute=None): + """Return a string which is the concatenation of the strings in the + sequence. The separator between elements is an empty string per + default, you can define it with the optional parameter: + + .. sourcecode:: jinja + + {{ [1, 2, 3]|join('|') }} + -> 1|2|3 + + {{ [1, 2, 3]|join }} + -> 123 + + It is also possible to join certain attributes of an object: + + .. sourcecode:: jinja + + {{ users|join(', ', attribute='username') }} + + .. versionadded:: 2.6 + The `attribute` parameter was added. + """ + if attribute is not None: + value = imap(make_attrgetter(eval_ctx.environment, attribute), value) + + # no automatic escaping? joining is a lot eaiser then + if not eval_ctx.autoescape: + return text_type(d).join(imap(text_type, value)) + + # if the delimiter doesn't have an html representation we check + # if any of the items has. If yes we do a coercion to Markup + if not hasattr(d, '__html__'): + value = list(value) + do_escape = False + for idx, item in enumerate(value): + if hasattr(item, '__html__'): + do_escape = True + else: + value[idx] = text_type(item) + if do_escape: + d = escape(d) + else: + d = text_type(d) + return d.join(value) + + # no html involved, to normal joining + return soft_unicode(d).join(imap(soft_unicode, value)) + + +def do_center(value, width=80): + """Centers the value in a field of a given width.""" + return text_type(value).center(width) + + +@environmentfilter +def do_first(environment, seq): + """Return the first item of a sequence.""" + try: + return next(iter(seq)) + except StopIteration: + return environment.undefined('No first item, sequence was empty.') + + +@environmentfilter +def do_last(environment, seq): + """Return the last item of a sequence.""" + try: + return next(iter(reversed(seq))) + except StopIteration: + return environment.undefined('No last item, sequence was empty.') + + +@contextfilter +def do_random(context, seq): + """Return a random item from the sequence.""" + try: + return random.choice(seq) + except IndexError: + return context.environment.undefined('No random item, sequence was empty.') + + +def do_filesizeformat(value, binary=False): + """Format the value like a 'human-readable' file size (i.e. 13 kB, + 4.1 MB, 102 Bytes, etc). Per default decimal prefixes are used (Mega, + Giga, etc.), if the second parameter is set to `True` the binary + prefixes are used (Mebi, Gibi). + """ + bytes = float(value) + base = binary and 1024 or 1000 + prefixes = [ + (binary and 'KiB' or 'kB'), + (binary and 'MiB' or 'MB'), + (binary and 'GiB' or 'GB'), + (binary and 'TiB' or 'TB'), + (binary and 'PiB' or 'PB'), + (binary and 'EiB' or 'EB'), + (binary and 'ZiB' or 'ZB'), + (binary and 'YiB' or 'YB') + ] + if bytes == 1: + return '1 Byte' + elif bytes < base: + return '%d Bytes' % bytes + else: + for i, prefix in enumerate(prefixes): + unit = base ** (i + 2) + if bytes < unit: + return '%.1f %s' % ((base * bytes / unit), prefix) + return '%.1f %s' % ((base * bytes / unit), prefix) + + +def do_pprint(value, verbose=False): + """Pretty print a variable. Useful for debugging. + + With Jinja 1.2 onwards you can pass it a parameter. If this parameter + is truthy the output will be more verbose (this requires `pretty`) + """ + return pformat(value, verbose=verbose) + + +@evalcontextfilter +def do_urlize(eval_ctx, value, trim_url_limit=None, nofollow=False, + target=None, rel=None): + """Converts URLs in plain text into clickable links. + + If you pass the filter an additional integer it will shorten the urls + to that number. Also a third argument exists that makes the urls + "nofollow": + + .. sourcecode:: jinja + + {{ mytext|urlize(40, true) }} + links are shortened to 40 chars and defined with rel="nofollow" + + If *target* is specified, the ``target`` attribute will be added to the + ``<a>`` tag: + + .. sourcecode:: jinja + + {{ mytext|urlize(40, target='_blank') }} + + .. versionchanged:: 2.8+ + The *target* parameter was added. + """ + policies = eval_ctx.environment.policies + rel = set((rel or '').split() or []) + if nofollow: + rel.add('nofollow') + rel.update((policies['urlize.rel'] or '').split()) + if target is None: + target = policies['urlize.target'] + rel = ' '.join(sorted(rel)) or None + rv = urlize(value, trim_url_limit, rel=rel, target=target) + if eval_ctx.autoescape: + rv = Markup(rv) + return rv + + +def do_indent( + s, width=4, first=False, blank=False, indentfirst=None +): + """Return a copy of the string with each line indented by 4 spaces. The + first line and blank lines are not indented by default. + + :param width: Number of spaces to indent by. + :param first: Don't skip indenting the first line. + :param blank: Don't skip indenting empty lines. + + .. versionchanged:: 2.10 + Blank lines are not indented by default. + + Rename the ``indentfirst`` argument to ``first``. + """ + if indentfirst is not None: + warnings.warn(DeprecationWarning( + 'The "indentfirst" argument is renamed to "first".' + ), stacklevel=2) + first = indentfirst + + s += u'\n' # this quirk is necessary for splitlines method + indention = u' ' * width + + if blank: + rv = (u'\n' + indention).join(s.splitlines()) + else: + lines = s.splitlines() + rv = lines.pop(0) + + if lines: + rv += u'\n' + u'\n'.join( + indention + line if line else line for line in lines + ) + + if first: + rv = indention + rv + + return rv + + +@environmentfilter +def do_truncate(env, s, length=255, killwords=False, end='...', leeway=None): + """Return a truncated copy of the string. The length is specified + with the first parameter which defaults to ``255``. If the second + parameter is ``true`` the filter will cut the text at length. Otherwise + it will discard the last word. If the text was in fact + truncated it will append an ellipsis sign (``"..."``). If you want a + different ellipsis sign than ``"..."`` you can specify it using the + third parameter. Strings that only exceed the length by the tolerance + margin given in the fourth parameter will not be truncated. + + .. sourcecode:: jinja + + {{ "foo bar baz qux"|truncate(9) }} + -> "foo..." + {{ "foo bar baz qux"|truncate(9, True) }} + -> "foo ba..." + {{ "foo bar baz qux"|truncate(11) }} + -> "foo bar baz qux" + {{ "foo bar baz qux"|truncate(11, False, '...', 0) }} + -> "foo bar..." + + The default leeway on newer Jinja2 versions is 5 and was 0 before but + can be reconfigured globally. + """ + if leeway is None: + leeway = env.policies['truncate.leeway'] + assert length >= len(end), 'expected length >= %s, got %s' % (len(end), length) + assert leeway >= 0, 'expected leeway >= 0, got %s' % leeway + if len(s) <= length + leeway: + return s + if killwords: + return s[:length - len(end)] + end + result = s[:length - len(end)].rsplit(' ', 1)[0] + return result + end + + +@environmentfilter +def do_wordwrap(environment, s, width=79, break_long_words=True, + wrapstring=None): + """ + Return a copy of the string passed to the filter wrapped after + ``79`` characters. You can override this default using the first + parameter. If you set the second parameter to `false` Jinja will not + split words apart if they are longer than `width`. By default, the newlines + will be the default newlines for the environment, but this can be changed + using the wrapstring keyword argument. + + .. versionadded:: 2.7 + Added support for the `wrapstring` parameter. + """ + if not wrapstring: + wrapstring = environment.newline_sequence + import textwrap + return wrapstring.join(textwrap.wrap(s, width=width, expand_tabs=False, + replace_whitespace=False, + break_long_words=break_long_words)) + + +def do_wordcount(s): + """Count the words in that string.""" + return len(_word_re.findall(s)) + + +def do_int(value, default=0, base=10): + """Convert the value into an integer. If the + conversion doesn't work it will return ``0``. You can + override this default using the first parameter. You + can also override the default base (10) in the second + parameter, which handles input with prefixes such as + 0b, 0o and 0x for bases 2, 8 and 16 respectively. + The base is ignored for decimal numbers and non-string values. + """ + try: + if isinstance(value, string_types): + return int(value, base) + return int(value) + except (TypeError, ValueError): + # this quirk is necessary so that "42.23"|int gives 42. + try: + return int(float(value)) + except (TypeError, ValueError): + return default + + +def do_float(value, default=0.0): + """Convert the value into a floating point number. If the + conversion doesn't work it will return ``0.0``. You can + override this default using the first parameter. + """ + try: + return float(value) + except (TypeError, ValueError): + return default + + +def do_format(value, *args, **kwargs): + """ + Apply python string formatting on an object: + + .. sourcecode:: jinja + + {{ "%s - %s"|format("Hello?", "Foo!") }} + -> Hello? - Foo! + """ + if args and kwargs: + raise FilterArgumentError('can\'t handle positional and keyword ' + 'arguments at the same time') + return soft_unicode(value) % (kwargs or args) + + +def do_trim(value): + """Strip leading and trailing whitespace.""" + return soft_unicode(value).strip() + + +def do_striptags(value): + """Strip SGML/XML tags and replace adjacent whitespace by one space. + """ + if hasattr(value, '__html__'): + value = value.__html__() + return Markup(text_type(value)).striptags() + + +def do_slice(value, slices, fill_with=None): + """Slice an iterator and return a list of lists containing + those items. Useful if you want to create a div containing + three ul tags that represent columns: + + .. sourcecode:: html+jinja + + <div class="columwrapper"> + {%- for column in items|slice(3) %} + <ul class="column-{{ loop.index }}"> + {%- for item in column %} + <li>{{ item }}</li> + {%- endfor %} + </ul> + {%- endfor %} + </div> + + If you pass it a second argument it's used to fill missing + values on the last iteration. + """ + seq = list(value) + length = len(seq) + items_per_slice = length // slices + slices_with_extra = length % slices + offset = 0 + for slice_number in range(slices): + start = offset + slice_number * items_per_slice + if slice_number < slices_with_extra: + offset += 1 + end = offset + (slice_number + 1) * items_per_slice + tmp = seq[start:end] + if fill_with is not None and slice_number >= slices_with_extra: + tmp.append(fill_with) + yield tmp + + +def do_batch(value, linecount, fill_with=None): + """ + A filter that batches items. It works pretty much like `slice` + just the other way round. It returns a list of lists with the + given number of items. If you provide a second parameter this + is used to fill up missing items. See this example: + + .. sourcecode:: html+jinja + + <table> + {%- for row in items|batch(3, ' ') %} + <tr> + {%- for column in row %} + <td>{{ column }}</td> + {%- endfor %} + </tr> + {%- endfor %} + </table> + """ + tmp = [] + for item in value: + if len(tmp) == linecount: + yield tmp + tmp = [] + tmp.append(item) + if tmp: + if fill_with is not None and len(tmp) < linecount: + tmp += [fill_with] * (linecount - len(tmp)) + yield tmp + + +def do_round(value, precision=0, method='common'): + """Round the number to a given precision. The first + parameter specifies the precision (default is ``0``), the + second the rounding method: + + - ``'common'`` rounds either up or down + - ``'ceil'`` always rounds up + - ``'floor'`` always rounds down + + If you don't specify a method ``'common'`` is used. + + .. sourcecode:: jinja + + {{ 42.55|round }} + -> 43.0 + {{ 42.55|round(1, 'floor') }} + -> 42.5 + + Note that even if rounded to 0 precision, a float is returned. If + you need a real integer, pipe it through `int`: + + .. sourcecode:: jinja + + {{ 42.55|round|int }} + -> 43 + """ + if not method in ('common', 'ceil', 'floor'): + raise FilterArgumentError('method must be common, ceil or floor') + if method == 'common': + return round(value, precision) + func = getattr(math, method) + return func(value * (10 ** precision)) / (10 ** precision) + + +# Use a regular tuple repr here. This is what we did in the past and we +# really want to hide this custom type as much as possible. In particular +# we do not want to accidentally expose an auto generated repr in case +# people start to print this out in comments or something similar for +# debugging. +_GroupTuple = namedtuple('_GroupTuple', ['grouper', 'list']) +_GroupTuple.__repr__ = tuple.__repr__ +_GroupTuple.__str__ = tuple.__str__ + +@environmentfilter +def do_groupby(environment, value, attribute): + """Group a sequence of objects by a common attribute. + + If you for example have a list of dicts or objects that represent persons + with `gender`, `first_name` and `last_name` attributes and you want to + group all users by genders you can do something like the following + snippet: + + .. sourcecode:: html+jinja + + <ul> + {% for group in persons|groupby('gender') %} + <li>{{ group.grouper }}<ul> + {% for person in group.list %} + <li>{{ person.first_name }} {{ person.last_name }}</li> + {% endfor %}</ul></li> + {% endfor %} + </ul> + + Additionally it's possible to use tuple unpacking for the grouper and + list: + + .. sourcecode:: html+jinja + + <ul> + {% for grouper, list in persons|groupby('gender') %} + ... + {% endfor %} + </ul> + + As you can see the item we're grouping by is stored in the `grouper` + attribute and the `list` contains all the objects that have this grouper + in common. + + .. versionchanged:: 2.6 + It's now possible to use dotted notation to group by the child + attribute of another attribute. + """ + expr = make_attrgetter(environment, attribute) + return [_GroupTuple(key, list(values)) for key, values + in groupby(sorted(value, key=expr), expr)] + + +@environmentfilter +def do_sum(environment, iterable, attribute=None, start=0): + """Returns the sum of a sequence of numbers plus the value of parameter + 'start' (which defaults to 0). When the sequence is empty it returns + start. + + It is also possible to sum up only certain attributes: + + .. sourcecode:: jinja + + Total: {{ items|sum(attribute='price') }} + + .. versionchanged:: 2.6 + The `attribute` parameter was added to allow suming up over + attributes. Also the `start` parameter was moved on to the right. + """ + if attribute is not None: + iterable = imap(make_attrgetter(environment, attribute), iterable) + return sum(iterable, start) + + +def do_list(value): + """Convert the value into a list. If it was a string the returned list + will be a list of characters. + """ + return list(value) + + +def do_mark_safe(value): + """Mark the value as safe which means that in an environment with automatic + escaping enabled this variable will not be escaped. + """ + return Markup(value) + + +def do_mark_unsafe(value): + """Mark a value as unsafe. This is the reverse operation for :func:`safe`.""" + return text_type(value) + + +def do_reverse(value): + """Reverse the object or return an iterator that iterates over it the other + way round. + """ + if isinstance(value, string_types): + return value[::-1] + try: + return reversed(value) + except TypeError: + try: + rv = list(value) + rv.reverse() + return rv + except TypeError: + raise FilterArgumentError('argument must be iterable') + + +@environmentfilter +def do_attr(environment, obj, name): + """Get an attribute of an object. ``foo|attr("bar")`` works like + ``foo.bar`` just that always an attribute is returned and items are not + looked up. + + See :ref:`Notes on subscriptions <notes-on-subscriptions>` for more details. + """ + try: + name = str(name) + except UnicodeError: + pass + else: + try: + value = getattr(obj, name) + except AttributeError: + pass + else: + if environment.sandboxed and not \ + environment.is_safe_attribute(obj, name, value): + return environment.unsafe_undefined(obj, name) + return value + return environment.undefined(obj=obj, name=name) + + +@contextfilter +def do_map(*args, **kwargs): + """Applies a filter on a sequence of objects or looks up an attribute. + This is useful when dealing with lists of objects but you are really + only interested in a certain value of it. + + The basic usage is mapping on an attribute. Imagine you have a list + of users but you are only interested in a list of usernames: + + .. sourcecode:: jinja + + Users on this page: {{ users|map(attribute='username')|join(', ') }} + + Alternatively you can let it invoke a filter by passing the name of the + filter and the arguments afterwards. A good example would be applying a + text conversion filter on a sequence: + + .. sourcecode:: jinja + + Users on this page: {{ titles|map('lower')|join(', ') }} + + .. versionadded:: 2.7 + """ + seq, func = prepare_map(args, kwargs) + if seq: + for item in seq: + yield func(item) + + +@contextfilter +def do_select(*args, **kwargs): + """Filters a sequence of objects by applying a test to each object, + and only selecting the objects with the test succeeding. + + If no test is specified, each object will be evaluated as a boolean. + + Example usage: + + .. sourcecode:: jinja + + {{ numbers|select("odd") }} + {{ numbers|select("odd") }} + {{ numbers|select("divisibleby", 3) }} + {{ numbers|select("lessthan", 42) }} + {{ strings|select("equalto", "mystring") }} + + .. versionadded:: 2.7 + """ + return select_or_reject(args, kwargs, lambda x: x, False) + + +@contextfilter +def do_reject(*args, **kwargs): + """Filters a sequence of objects by applying a test to each object, + and rejecting the objects with the test succeeding. + + If no test is specified, each object will be evaluated as a boolean. + + Example usage: + + .. sourcecode:: jinja + + {{ numbers|reject("odd") }} + + .. versionadded:: 2.7 + """ + return select_or_reject(args, kwargs, lambda x: not x, False) + + +@contextfilter +def do_selectattr(*args, **kwargs): + """Filters a sequence of objects by applying a test to the specified + attribute of each object, and only selecting the objects with the + test succeeding. + + If no test is specified, the attribute's value will be evaluated as + a boolean. + + Example usage: + + .. sourcecode:: jinja + + {{ users|selectattr("is_active") }} + {{ users|selectattr("email", "none") }} + + .. versionadded:: 2.7 + """ + return select_or_reject(args, kwargs, lambda x: x, True) + + +@contextfilter +def do_rejectattr(*args, **kwargs): + """Filters a sequence of objects by applying a test to the specified + attribute of each object, and rejecting the objects with the test + succeeding. + + If no test is specified, the attribute's value will be evaluated as + a boolean. + + .. sourcecode:: jinja + + {{ users|rejectattr("is_active") }} + {{ users|rejectattr("email", "none") }} + + .. versionadded:: 2.7 + """ + return select_or_reject(args, kwargs, lambda x: not x, True) + + +@evalcontextfilter +def do_tojson(eval_ctx, value, indent=None): + """Dumps a structure to JSON so that it's safe to use in ``<script>`` + tags. It accepts the same arguments and returns a JSON string. Note that + this is available in templates through the ``|tojson`` filter which will + also mark the result as safe. Due to how this function escapes certain + characters this is safe even if used outside of ``<script>`` tags. + + The following characters are escaped in strings: + + - ``<`` + - ``>`` + - ``&`` + - ``'`` + + This makes it safe to embed such strings in any place in HTML with the + notable exception of double quoted attributes. In that case single + quote your attributes or HTML escape it in addition. + + The indent parameter can be used to enable pretty printing. Set it to + the number of spaces that the structures should be indented with. + + Note that this filter is for use in HTML contexts only. + + .. versionadded:: 2.9 + """ + policies = eval_ctx.environment.policies + dumper = policies['json.dumps_function'] + options = policies['json.dumps_kwargs'] + if indent is not None: + options = dict(options) + options['indent'] = indent + return htmlsafe_json_dumps(value, dumper=dumper, **options) + + +def prepare_map(args, kwargs): + context = args[0] + seq = args[1] + + if len(args) == 2 and 'attribute' in kwargs: + attribute = kwargs.pop('attribute') + if kwargs: + raise FilterArgumentError('Unexpected keyword argument %r' % + next(iter(kwargs))) + func = make_attrgetter(context.environment, attribute) + else: + try: + name = args[2] + args = args[3:] + except LookupError: + raise FilterArgumentError('map requires a filter argument') + func = lambda item: context.environment.call_filter( + name, item, args, kwargs, context=context) + + return seq, func + + +def prepare_select_or_reject(args, kwargs, modfunc, lookup_attr): + context = args[0] + seq = args[1] + if lookup_attr: + try: + attr = args[2] + except LookupError: + raise FilterArgumentError('Missing parameter for attribute name') + transfunc = make_attrgetter(context.environment, attr) + off = 1 + else: + off = 0 + transfunc = lambda x: x + + try: + name = args[2 + off] + args = args[3 + off:] + func = lambda item: context.environment.call_test( + name, item, args, kwargs) + except LookupError: + func = bool + + return seq, lambda item: modfunc(func(transfunc(item))) + + +def select_or_reject(args, kwargs, modfunc, lookup_attr): + seq, func = prepare_select_or_reject(args, kwargs, modfunc, lookup_attr) + if seq: + for item in seq: + if func(item): + yield item + + +FILTERS = { + 'abs': abs, + 'attr': do_attr, + 'batch': do_batch, + 'capitalize': do_capitalize, + 'center': do_center, + 'count': len, + 'd': do_default, + 'default': do_default, + 'dictsort': do_dictsort, + 'e': escape, + 'escape': escape, + 'filesizeformat': do_filesizeformat, + 'first': do_first, + 'float': do_float, + 'forceescape': do_forceescape, + 'format': do_format, + 'groupby': do_groupby, + 'indent': do_indent, + 'int': do_int, + 'join': do_join, + 'last': do_last, + 'length': len, + 'list': do_list, + 'lower': do_lower, + 'map': do_map, + 'min': do_min, + 'max': do_max, + 'pprint': do_pprint, + 'random': do_random, + 'reject': do_reject, + 'rejectattr': do_rejectattr, + 'replace': do_replace, + 'reverse': do_reverse, + 'round': do_round, + 'safe': do_mark_safe, + 'select': do_select, + 'selectattr': do_selectattr, + 'slice': do_slice, + 'sort': do_sort, + 'string': soft_unicode, + 'striptags': do_striptags, + 'sum': do_sum, + 'title': do_title, + 'trim': do_trim, + 'truncate': do_truncate, + 'unique': do_unique, + 'upper': do_upper, + 'urlencode': do_urlencode, + 'urlize': do_urlize, + 'wordcount': do_wordcount, + 'wordwrap': do_wordwrap, + 'xmlattr': do_xmlattr, + 'tojson': do_tojson, +} diff --git a/python/jinja2/idtracking.py b/python/jinja2/idtracking.py new file mode 100644 index 0000000..491bfe0 --- /dev/null +++ b/python/jinja2/idtracking.py @@ -0,0 +1,286 @@ +from jinja2.visitor import NodeVisitor +from jinja2._compat import iteritems + + +VAR_LOAD_PARAMETER = 'param' +VAR_LOAD_RESOLVE = 'resolve' +VAR_LOAD_ALIAS = 'alias' +VAR_LOAD_UNDEFINED = 'undefined' + + +def find_symbols(nodes, parent_symbols=None): + sym = Symbols(parent=parent_symbols) + visitor = FrameSymbolVisitor(sym) + for node in nodes: + visitor.visit(node) + return sym + + +def symbols_for_node(node, parent_symbols=None): + sym = Symbols(parent=parent_symbols) + sym.analyze_node(node) + return sym + + +class Symbols(object): + + def __init__(self, parent=None, level=None): + if level is None: + if parent is None: + level = 0 + else: + level = parent.level + 1 + self.level = level + self.parent = parent + self.refs = {} + self.loads = {} + self.stores = set() + + def analyze_node(self, node, **kwargs): + visitor = RootVisitor(self) + visitor.visit(node, **kwargs) + + def _define_ref(self, name, load=None): + ident = 'l_%d_%s' % (self.level, name) + self.refs[name] = ident + if load is not None: + self.loads[ident] = load + return ident + + def find_load(self, target): + if target in self.loads: + return self.loads[target] + if self.parent is not None: + return self.parent.find_load(target) + + def find_ref(self, name): + if name in self.refs: + return self.refs[name] + if self.parent is not None: + return self.parent.find_ref(name) + + def ref(self, name): + rv = self.find_ref(name) + if rv is None: + raise AssertionError('Tried to resolve a name to a reference that ' + 'was unknown to the frame (%r)' % name) + return rv + + def copy(self): + rv = object.__new__(self.__class__) + rv.__dict__.update(self.__dict__) + rv.refs = self.refs.copy() + rv.loads = self.loads.copy() + rv.stores = self.stores.copy() + return rv + + def store(self, name): + self.stores.add(name) + + # If we have not see the name referenced yet, we need to figure + # out what to set it to. + if name not in self.refs: + # If there is a parent scope we check if the name has a + # reference there. If it does it means we might have to alias + # to a variable there. + if self.parent is not None: + outer_ref = self.parent.find_ref(name) + if outer_ref is not None: + self._define_ref(name, load=(VAR_LOAD_ALIAS, outer_ref)) + return + + # Otherwise we can just set it to undefined. + self._define_ref(name, load=(VAR_LOAD_UNDEFINED, None)) + + def declare_parameter(self, name): + self.stores.add(name) + return self._define_ref(name, load=(VAR_LOAD_PARAMETER, None)) + + def load(self, name): + target = self.find_ref(name) + if target is None: + self._define_ref(name, load=(VAR_LOAD_RESOLVE, name)) + + def branch_update(self, branch_symbols): + stores = {} + for branch in branch_symbols: + for target in branch.stores: + if target in self.stores: + continue + stores[target] = stores.get(target, 0) + 1 + + for sym in branch_symbols: + self.refs.update(sym.refs) + self.loads.update(sym.loads) + self.stores.update(sym.stores) + + for name, branch_count in iteritems(stores): + if branch_count == len(branch_symbols): + continue + target = self.find_ref(name) + assert target is not None, 'should not happen' + + if self.parent is not None: + outer_target = self.parent.find_ref(name) + if outer_target is not None: + self.loads[target] = (VAR_LOAD_ALIAS, outer_target) + continue + self.loads[target] = (VAR_LOAD_RESOLVE, name) + + def dump_stores(self): + rv = {} + node = self + while node is not None: + for name in node.stores: + if name not in rv: + rv[name] = self.find_ref(name) + node = node.parent + return rv + + def dump_param_targets(self): + rv = set() + node = self + while node is not None: + for target, (instr, _) in iteritems(self.loads): + if instr == VAR_LOAD_PARAMETER: + rv.add(target) + node = node.parent + return rv + + +class RootVisitor(NodeVisitor): + + def __init__(self, symbols): + self.sym_visitor = FrameSymbolVisitor(symbols) + + def _simple_visit(self, node, **kwargs): + for child in node.iter_child_nodes(): + self.sym_visitor.visit(child) + + visit_Template = visit_Block = visit_Macro = visit_FilterBlock = \ + visit_Scope = visit_If = visit_ScopedEvalContextModifier = \ + _simple_visit + + def visit_AssignBlock(self, node, **kwargs): + for child in node.body: + self.sym_visitor.visit(child) + + def visit_CallBlock(self, node, **kwargs): + for child in node.iter_child_nodes(exclude=('call',)): + self.sym_visitor.visit(child) + + def visit_OverlayScope(self, node, **kwargs): + for child in node.body: + self.sym_visitor.visit(child) + + def visit_For(self, node, for_branch='body', **kwargs): + if for_branch == 'body': + self.sym_visitor.visit(node.target, store_as_param=True) + branch = node.body + elif for_branch == 'else': + branch = node.else_ + elif for_branch == 'test': + self.sym_visitor.visit(node.target, store_as_param=True) + if node.test is not None: + self.sym_visitor.visit(node.test) + return + else: + raise RuntimeError('Unknown for branch') + for item in branch or (): + self.sym_visitor.visit(item) + + def visit_With(self, node, **kwargs): + for target in node.targets: + self.sym_visitor.visit(target) + for child in node.body: + self.sym_visitor.visit(child) + + def generic_visit(self, node, *args, **kwargs): + raise NotImplementedError('Cannot find symbols for %r' % + node.__class__.__name__) + + +class FrameSymbolVisitor(NodeVisitor): + """A visitor for `Frame.inspect`.""" + + def __init__(self, symbols): + self.symbols = symbols + + def visit_Name(self, node, store_as_param=False, **kwargs): + """All assignments to names go through this function.""" + if store_as_param or node.ctx == 'param': + self.symbols.declare_parameter(node.name) + elif node.ctx == 'store': + self.symbols.store(node.name) + elif node.ctx == 'load': + self.symbols.load(node.name) + + def visit_NSRef(self, node, **kwargs): + self.symbols.load(node.name) + + def visit_If(self, node, **kwargs): + self.visit(node.test, **kwargs) + + original_symbols = self.symbols + + def inner_visit(nodes): + self.symbols = rv = original_symbols.copy() + for subnode in nodes: + self.visit(subnode, **kwargs) + self.symbols = original_symbols + return rv + + body_symbols = inner_visit(node.body) + elif_symbols = inner_visit(node.elif_) + else_symbols = inner_visit(node.else_ or ()) + + self.symbols.branch_update([body_symbols, elif_symbols, else_symbols]) + + def visit_Macro(self, node, **kwargs): + self.symbols.store(node.name) + + def visit_Import(self, node, **kwargs): + self.generic_visit(node, **kwargs) + self.symbols.store(node.target) + + def visit_FromImport(self, node, **kwargs): + self.generic_visit(node, **kwargs) + for name in node.names: + if isinstance(name, tuple): + self.symbols.store(name[1]) + else: + self.symbols.store(name) + + def visit_Assign(self, node, **kwargs): + """Visit assignments in the correct order.""" + self.visit(node.node, **kwargs) + self.visit(node.target, **kwargs) + + def visit_For(self, node, **kwargs): + """Visiting stops at for blocks. However the block sequence + is visited as part of the outer scope. + """ + self.visit(node.iter, **kwargs) + + def visit_CallBlock(self, node, **kwargs): + self.visit(node.call, **kwargs) + + def visit_FilterBlock(self, node, **kwargs): + self.visit(node.filter, **kwargs) + + def visit_With(self, node, **kwargs): + for target in node.values: + self.visit(target) + + def visit_AssignBlock(self, node, **kwargs): + """Stop visiting at block assigns.""" + self.visit(node.target, **kwargs) + + def visit_Scope(self, node, **kwargs): + """Stop visiting at scopes.""" + + def visit_Block(self, node, **kwargs): + """Stop visiting at blocks.""" + + def visit_OverlayScope(self, node, **kwargs): + """Do not visit into overlay scopes.""" diff --git a/python/jinja2/lexer.py b/python/jinja2/lexer.py new file mode 100644 index 0000000..6fd135d --- /dev/null +++ b/python/jinja2/lexer.py @@ -0,0 +1,739 @@ +# -*- coding: utf-8 -*- +""" + jinja2.lexer + ~~~~~~~~~~~~ + + This module implements a Jinja / Python combination lexer. The + `Lexer` class provided by this module is used to do some preprocessing + for Jinja. + + On the one hand it filters out invalid operators like the bitshift + operators we don't allow in templates. On the other hand it separates + template code and python code in expressions. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import re +from collections import deque +from operator import itemgetter + +from jinja2._compat import implements_iterator, intern, iteritems, text_type +from jinja2.exceptions import TemplateSyntaxError +from jinja2.utils import LRUCache + +# cache for the lexers. Exists in order to be able to have multiple +# environments with the same lexer +_lexer_cache = LRUCache(50) + +# static regular expressions +whitespace_re = re.compile(r'\s+', re.U) +string_re = re.compile(r"('([^'\\]*(?:\\.[^'\\]*)*)'" + r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S) +integer_re = re.compile(r'\d+') + +try: + # check if this Python supports Unicode identifiers + compile('föö', '<unknown>', 'eval') +except SyntaxError: + # no Unicode support, use ASCII identifiers + name_re = re.compile(r'[a-zA-Z_][a-zA-Z0-9_]*') + check_ident = False +else: + # Unicode support, build a pattern to match valid characters, and set flag + # to use str.isidentifier to validate during lexing + from jinja2 import _identifier + name_re = re.compile(r'[\w{0}]+'.format(_identifier.pattern)) + check_ident = True + # remove the pattern from memory after building the regex + import sys + del sys.modules['jinja2._identifier'] + import jinja2 + del jinja2._identifier + del _identifier + +float_re = re.compile(r'(?<!\.)\d+\.\d+') +newline_re = re.compile(r'(\r\n|\r|\n)') + +# internal the tokens and keep references to them +TOKEN_ADD = intern('add') +TOKEN_ASSIGN = intern('assign') +TOKEN_COLON = intern('colon') +TOKEN_COMMA = intern('comma') +TOKEN_DIV = intern('div') +TOKEN_DOT = intern('dot') +TOKEN_EQ = intern('eq') +TOKEN_FLOORDIV = intern('floordiv') +TOKEN_GT = intern('gt') +TOKEN_GTEQ = intern('gteq') +TOKEN_LBRACE = intern('lbrace') +TOKEN_LBRACKET = intern('lbracket') +TOKEN_LPAREN = intern('lparen') +TOKEN_LT = intern('lt') +TOKEN_LTEQ = intern('lteq') +TOKEN_MOD = intern('mod') +TOKEN_MUL = intern('mul') +TOKEN_NE = intern('ne') +TOKEN_PIPE = intern('pipe') +TOKEN_POW = intern('pow') +TOKEN_RBRACE = intern('rbrace') +TOKEN_RBRACKET = intern('rbracket') +TOKEN_RPAREN = intern('rparen') +TOKEN_SEMICOLON = intern('semicolon') +TOKEN_SUB = intern('sub') +TOKEN_TILDE = intern('tilde') +TOKEN_WHITESPACE = intern('whitespace') +TOKEN_FLOAT = intern('float') +TOKEN_INTEGER = intern('integer') +TOKEN_NAME = intern('name') +TOKEN_STRING = intern('string') +TOKEN_OPERATOR = intern('operator') +TOKEN_BLOCK_BEGIN = intern('block_begin') +TOKEN_BLOCK_END = intern('block_end') +TOKEN_VARIABLE_BEGIN = intern('variable_begin') +TOKEN_VARIABLE_END = intern('variable_end') +TOKEN_RAW_BEGIN = intern('raw_begin') +TOKEN_RAW_END = intern('raw_end') +TOKEN_COMMENT_BEGIN = intern('comment_begin') +TOKEN_COMMENT_END = intern('comment_end') +TOKEN_COMMENT = intern('comment') +TOKEN_LINESTATEMENT_BEGIN = intern('linestatement_begin') +TOKEN_LINESTATEMENT_END = intern('linestatement_end') +TOKEN_LINECOMMENT_BEGIN = intern('linecomment_begin') +TOKEN_LINECOMMENT_END = intern('linecomment_end') +TOKEN_LINECOMMENT = intern('linecomment') +TOKEN_DATA = intern('data') +TOKEN_INITIAL = intern('initial') +TOKEN_EOF = intern('eof') + +# bind operators to token types +operators = { + '+': TOKEN_ADD, + '-': TOKEN_SUB, + '/': TOKEN_DIV, + '//': TOKEN_FLOORDIV, + '*': TOKEN_MUL, + '%': TOKEN_MOD, + '**': TOKEN_POW, + '~': TOKEN_TILDE, + '[': TOKEN_LBRACKET, + ']': TOKEN_RBRACKET, + '(': TOKEN_LPAREN, + ')': TOKEN_RPAREN, + '{': TOKEN_LBRACE, + '}': TOKEN_RBRACE, + '==': TOKEN_EQ, + '!=': TOKEN_NE, + '>': TOKEN_GT, + '>=': TOKEN_GTEQ, + '<': TOKEN_LT, + '<=': TOKEN_LTEQ, + '=': TOKEN_ASSIGN, + '.': TOKEN_DOT, + ':': TOKEN_COLON, + '|': TOKEN_PIPE, + ',': TOKEN_COMMA, + ';': TOKEN_SEMICOLON +} + +reverse_operators = dict([(v, k) for k, v in iteritems(operators)]) +assert len(operators) == len(reverse_operators), 'operators dropped' +operator_re = re.compile('(%s)' % '|'.join(re.escape(x) for x in + sorted(operators, key=lambda x: -len(x)))) + +ignored_tokens = frozenset([TOKEN_COMMENT_BEGIN, TOKEN_COMMENT, + TOKEN_COMMENT_END, TOKEN_WHITESPACE, + TOKEN_LINECOMMENT_BEGIN, TOKEN_LINECOMMENT_END, + TOKEN_LINECOMMENT]) +ignore_if_empty = frozenset([TOKEN_WHITESPACE, TOKEN_DATA, + TOKEN_COMMENT, TOKEN_LINECOMMENT]) + + +def _describe_token_type(token_type): + if token_type in reverse_operators: + return reverse_operators[token_type] + return { + TOKEN_COMMENT_BEGIN: 'begin of comment', + TOKEN_COMMENT_END: 'end of comment', + TOKEN_COMMENT: 'comment', + TOKEN_LINECOMMENT: 'comment', + TOKEN_BLOCK_BEGIN: 'begin of statement block', + TOKEN_BLOCK_END: 'end of statement block', + TOKEN_VARIABLE_BEGIN: 'begin of print statement', + TOKEN_VARIABLE_END: 'end of print statement', + TOKEN_LINESTATEMENT_BEGIN: 'begin of line statement', + TOKEN_LINESTATEMENT_END: 'end of line statement', + TOKEN_DATA: 'template data / text', + TOKEN_EOF: 'end of template' + }.get(token_type, token_type) + + +def describe_token(token): + """Returns a description of the token.""" + if token.type == 'name': + return token.value + return _describe_token_type(token.type) + + +def describe_token_expr(expr): + """Like `describe_token` but for token expressions.""" + if ':' in expr: + type, value = expr.split(':', 1) + if type == 'name': + return value + else: + type = expr + return _describe_token_type(type) + + +def count_newlines(value): + """Count the number of newline characters in the string. This is + useful for extensions that filter a stream. + """ + return len(newline_re.findall(value)) + + +def compile_rules(environment): + """Compiles all the rules from the environment into a list of rules.""" + e = re.escape + rules = [ + (len(environment.comment_start_string), 'comment', + e(environment.comment_start_string)), + (len(environment.block_start_string), 'block', + e(environment.block_start_string)), + (len(environment.variable_start_string), 'variable', + e(environment.variable_start_string)) + ] + + if environment.line_statement_prefix is not None: + rules.append((len(environment.line_statement_prefix), 'linestatement', + r'^[ \t\v]*' + e(environment.line_statement_prefix))) + if environment.line_comment_prefix is not None: + rules.append((len(environment.line_comment_prefix), 'linecomment', + r'(?:^|(?<=\S))[^\S\r\n]*' + + e(environment.line_comment_prefix))) + + return [x[1:] for x in sorted(rules, reverse=True)] + + +class Failure(object): + """Class that raises a `TemplateSyntaxError` if called. + Used by the `Lexer` to specify known errors. + """ + + def __init__(self, message, cls=TemplateSyntaxError): + self.message = message + self.error_class = cls + + def __call__(self, lineno, filename): + raise self.error_class(self.message, lineno, filename) + + +class Token(tuple): + """Token class.""" + __slots__ = () + lineno, type, value = (property(itemgetter(x)) for x in range(3)) + + def __new__(cls, lineno, type, value): + return tuple.__new__(cls, (lineno, intern(str(type)), value)) + + def __str__(self): + if self.type in reverse_operators: + return reverse_operators[self.type] + elif self.type == 'name': + return self.value + return self.type + + def test(self, expr): + """Test a token against a token expression. This can either be a + token type or ``'token_type:token_value'``. This can only test + against string values and types. + """ + # here we do a regular string equality check as test_any is usually + # passed an iterable of not interned strings. + if self.type == expr: + return True + elif ':' in expr: + return expr.split(':', 1) == [self.type, self.value] + return False + + def test_any(self, *iterable): + """Test against multiple token expressions.""" + for expr in iterable: + if self.test(expr): + return True + return False + + def __repr__(self): + return 'Token(%r, %r, %r)' % ( + self.lineno, + self.type, + self.value + ) + + +@implements_iterator +class TokenStreamIterator(object): + """The iterator for tokenstreams. Iterate over the stream + until the eof token is reached. + """ + + def __init__(self, stream): + self.stream = stream + + def __iter__(self): + return self + + def __next__(self): + token = self.stream.current + if token.type is TOKEN_EOF: + self.stream.close() + raise StopIteration() + next(self.stream) + return token + + +@implements_iterator +class TokenStream(object): + """A token stream is an iterable that yields :class:`Token`\\s. The + parser however does not iterate over it but calls :meth:`next` to go + one token ahead. The current active token is stored as :attr:`current`. + """ + + def __init__(self, generator, name, filename): + self._iter = iter(generator) + self._pushed = deque() + self.name = name + self.filename = filename + self.closed = False + self.current = Token(1, TOKEN_INITIAL, '') + next(self) + + def __iter__(self): + return TokenStreamIterator(self) + + def __bool__(self): + return bool(self._pushed) or self.current.type is not TOKEN_EOF + __nonzero__ = __bool__ # py2 + + eos = property(lambda x: not x, doc="Are we at the end of the stream?") + + def push(self, token): + """Push a token back to the stream.""" + self._pushed.append(token) + + def look(self): + """Look at the next token.""" + old_token = next(self) + result = self.current + self.push(result) + self.current = old_token + return result + + def skip(self, n=1): + """Got n tokens ahead.""" + for x in range(n): + next(self) + + def next_if(self, expr): + """Perform the token test and return the token if it matched. + Otherwise the return value is `None`. + """ + if self.current.test(expr): + return next(self) + + def skip_if(self, expr): + """Like :meth:`next_if` but only returns `True` or `False`.""" + return self.next_if(expr) is not None + + def __next__(self): + """Go one token ahead and return the old one. + + Use the built-in :func:`next` instead of calling this directly. + """ + rv = self.current + if self._pushed: + self.current = self._pushed.popleft() + elif self.current.type is not TOKEN_EOF: + try: + self.current = next(self._iter) + except StopIteration: + self.close() + return rv + + def close(self): + """Close the stream.""" + self.current = Token(self.current.lineno, TOKEN_EOF, '') + self._iter = None + self.closed = True + + def expect(self, expr): + """Expect a given token type and return it. This accepts the same + argument as :meth:`jinja2.lexer.Token.test`. + """ + if not self.current.test(expr): + expr = describe_token_expr(expr) + if self.current.type is TOKEN_EOF: + raise TemplateSyntaxError('unexpected end of template, ' + 'expected %r.' % expr, + self.current.lineno, + self.name, self.filename) + raise TemplateSyntaxError("expected token %r, got %r" % + (expr, describe_token(self.current)), + self.current.lineno, + self.name, self.filename) + try: + return self.current + finally: + next(self) + + +def get_lexer(environment): + """Return a lexer which is probably cached.""" + key = (environment.block_start_string, + environment.block_end_string, + environment.variable_start_string, + environment.variable_end_string, + environment.comment_start_string, + environment.comment_end_string, + environment.line_statement_prefix, + environment.line_comment_prefix, + environment.trim_blocks, + environment.lstrip_blocks, + environment.newline_sequence, + environment.keep_trailing_newline) + lexer = _lexer_cache.get(key) + if lexer is None: + lexer = Lexer(environment) + _lexer_cache[key] = lexer + return lexer + + +class Lexer(object): + """Class that implements a lexer for a given environment. Automatically + created by the environment class, usually you don't have to do that. + + Note that the lexer is not automatically bound to an environment. + Multiple environments can share the same lexer. + """ + + def __init__(self, environment): + # shortcuts + c = lambda x: re.compile(x, re.M | re.S) + e = re.escape + + # lexing rules for tags + tag_rules = [ + (whitespace_re, TOKEN_WHITESPACE, None), + (float_re, TOKEN_FLOAT, None), + (integer_re, TOKEN_INTEGER, None), + (name_re, TOKEN_NAME, None), + (string_re, TOKEN_STRING, None), + (operator_re, TOKEN_OPERATOR, None) + ] + + # assemble the root lexing rule. because "|" is ungreedy + # we have to sort by length so that the lexer continues working + # as expected when we have parsing rules like <% for block and + # <%= for variables. (if someone wants asp like syntax) + # variables are just part of the rules if variable processing + # is required. + root_tag_rules = compile_rules(environment) + + # block suffix if trimming is enabled + block_suffix_re = environment.trim_blocks and '\\n?' or '' + + # strip leading spaces if lstrip_blocks is enabled + prefix_re = {} + if environment.lstrip_blocks: + # use '{%+' to manually disable lstrip_blocks behavior + no_lstrip_re = e('+') + # detect overlap between block and variable or comment strings + block_diff = c(r'^%s(.*)' % e(environment.block_start_string)) + # make sure we don't mistake a block for a variable or a comment + m = block_diff.match(environment.comment_start_string) + no_lstrip_re += m and r'|%s' % e(m.group(1)) or '' + m = block_diff.match(environment.variable_start_string) + no_lstrip_re += m and r'|%s' % e(m.group(1)) or '' + + # detect overlap between comment and variable strings + comment_diff = c(r'^%s(.*)' % e(environment.comment_start_string)) + m = comment_diff.match(environment.variable_start_string) + no_variable_re = m and r'(?!%s)' % e(m.group(1)) or '' + + lstrip_re = r'^[ \t]*' + block_prefix_re = r'%s%s(?!%s)|%s\+?' % ( + lstrip_re, + e(environment.block_start_string), + no_lstrip_re, + e(environment.block_start_string), + ) + comment_prefix_re = r'%s%s%s|%s\+?' % ( + lstrip_re, + e(environment.comment_start_string), + no_variable_re, + e(environment.comment_start_string), + ) + prefix_re['block'] = block_prefix_re + prefix_re['comment'] = comment_prefix_re + else: + block_prefix_re = '%s' % e(environment.block_start_string) + + self.newline_sequence = environment.newline_sequence + self.keep_trailing_newline = environment.keep_trailing_newline + + # global lexing rules + self.rules = { + 'root': [ + # directives + (c('(.*?)(?:%s)' % '|'.join( + [r'(?P<raw_begin>(?:\s*%s\-|%s)\s*raw\s*(?:\-%s\s*|%s))' % ( + e(environment.block_start_string), + block_prefix_re, + e(environment.block_end_string), + e(environment.block_end_string) + )] + [ + r'(?P<%s_begin>\s*%s\-|%s)' % (n, r, prefix_re.get(n,r)) + for n, r in root_tag_rules + ])), (TOKEN_DATA, '#bygroup'), '#bygroup'), + # data + (c('.+'), TOKEN_DATA, None) + ], + # comments + TOKEN_COMMENT_BEGIN: [ + (c(r'(.*?)((?:\-%s\s*|%s)%s)' % ( + e(environment.comment_end_string), + e(environment.comment_end_string), + block_suffix_re + )), (TOKEN_COMMENT, TOKEN_COMMENT_END), '#pop'), + (c('(.)'), (Failure('Missing end of comment tag'),), None) + ], + # blocks + TOKEN_BLOCK_BEGIN: [ + (c(r'(?:\-%s\s*|%s)%s' % ( + e(environment.block_end_string), + e(environment.block_end_string), + block_suffix_re + )), TOKEN_BLOCK_END, '#pop'), + ] + tag_rules, + # variables + TOKEN_VARIABLE_BEGIN: [ + (c(r'\-%s\s*|%s' % ( + e(environment.variable_end_string), + e(environment.variable_end_string) + )), TOKEN_VARIABLE_END, '#pop') + ] + tag_rules, + # raw block + TOKEN_RAW_BEGIN: [ + (c(r'(.*?)((?:\s*%s\-|%s)\s*endraw\s*(?:\-%s\s*|%s%s))' % ( + e(environment.block_start_string), + block_prefix_re, + e(environment.block_end_string), + e(environment.block_end_string), + block_suffix_re + )), (TOKEN_DATA, TOKEN_RAW_END), '#pop'), + (c('(.)'), (Failure('Missing end of raw directive'),), None) + ], + # line statements + TOKEN_LINESTATEMENT_BEGIN: [ + (c(r'\s*(\n|$)'), TOKEN_LINESTATEMENT_END, '#pop') + ] + tag_rules, + # line comments + TOKEN_LINECOMMENT_BEGIN: [ + (c(r'(.*?)()(?=\n|$)'), (TOKEN_LINECOMMENT, + TOKEN_LINECOMMENT_END), '#pop') + ] + } + + def _normalize_newlines(self, value): + """Called for strings and template data to normalize it to unicode.""" + return newline_re.sub(self.newline_sequence, value) + + def tokenize(self, source, name=None, filename=None, state=None): + """Calls tokeniter + tokenize and wraps it in a token stream. + """ + stream = self.tokeniter(source, name, filename, state) + return TokenStream(self.wrap(stream, name, filename), name, filename) + + def wrap(self, stream, name=None, filename=None): + """This is called with the stream as returned by `tokenize` and wraps + every token in a :class:`Token` and converts the value. + """ + for lineno, token, value in stream: + if token in ignored_tokens: + continue + elif token == 'linestatement_begin': + token = 'block_begin' + elif token == 'linestatement_end': + token = 'block_end' + # we are not interested in those tokens in the parser + elif token in ('raw_begin', 'raw_end'): + continue + elif token == 'data': + value = self._normalize_newlines(value) + elif token == 'keyword': + token = value + elif token == 'name': + value = str(value) + if check_ident and not value.isidentifier(): + raise TemplateSyntaxError( + 'Invalid character in identifier', + lineno, name, filename) + elif token == 'string': + # try to unescape string + try: + value = self._normalize_newlines(value[1:-1]) \ + .encode('ascii', 'backslashreplace') \ + .decode('unicode-escape') + except Exception as e: + msg = str(e).split(':')[-1].strip() + raise TemplateSyntaxError(msg, lineno, name, filename) + elif token == 'integer': + value = int(value) + elif token == 'float': + value = float(value) + elif token == 'operator': + token = operators[value] + yield Token(lineno, token, value) + + def tokeniter(self, source, name, filename=None, state=None): + """This method tokenizes the text and returns the tokens in a + generator. Use this method if you just want to tokenize a template. + """ + source = text_type(source) + lines = source.splitlines() + if self.keep_trailing_newline and source: + for newline in ('\r\n', '\r', '\n'): + if source.endswith(newline): + lines.append('') + break + source = '\n'.join(lines) + pos = 0 + lineno = 1 + stack = ['root'] + if state is not None and state != 'root': + assert state in ('variable', 'block'), 'invalid state' + stack.append(state + '_begin') + else: + state = 'root' + statetokens = self.rules[stack[-1]] + source_length = len(source) + + balancing_stack = [] + + while 1: + # tokenizer loop + for regex, tokens, new_state in statetokens: + m = regex.match(source, pos) + # if no match we try again with the next rule + if m is None: + continue + + # we only match blocks and variables if braces / parentheses + # are balanced. continue parsing with the lower rule which + # is the operator rule. do this only if the end tags look + # like operators + if balancing_stack and \ + tokens in ('variable_end', 'block_end', + 'linestatement_end'): + continue + + # tuples support more options + if isinstance(tokens, tuple): + for idx, token in enumerate(tokens): + # failure group + if token.__class__ is Failure: + raise token(lineno, filename) + # bygroup is a bit more complex, in that case we + # yield for the current token the first named + # group that matched + elif token == '#bygroup': + for key, value in iteritems(m.groupdict()): + if value is not None: + yield lineno, key, value + lineno += value.count('\n') + break + else: + raise RuntimeError('%r wanted to resolve ' + 'the token dynamically' + ' but no group matched' + % regex) + # normal group + else: + data = m.group(idx + 1) + if data or token not in ignore_if_empty: + yield lineno, token, data + lineno += data.count('\n') + + # strings as token just are yielded as it. + else: + data = m.group() + # update brace/parentheses balance + if tokens == 'operator': + if data == '{': + balancing_stack.append('}') + elif data == '(': + balancing_stack.append(')') + elif data == '[': + balancing_stack.append(']') + elif data in ('}', ')', ']'): + if not balancing_stack: + raise TemplateSyntaxError('unexpected \'%s\'' % + data, lineno, name, + filename) + expected_op = balancing_stack.pop() + if expected_op != data: + raise TemplateSyntaxError('unexpected \'%s\', ' + 'expected \'%s\'' % + (data, expected_op), + lineno, name, + filename) + # yield items + if data or tokens not in ignore_if_empty: + yield lineno, tokens, data + lineno += data.count('\n') + + # fetch new position into new variable so that we can check + # if there is a internal parsing error which would result + # in an infinite loop + pos2 = m.end() + + # handle state changes + if new_state is not None: + # remove the uppermost state + if new_state == '#pop': + stack.pop() + # resolve the new state by group checking + elif new_state == '#bygroup': + for key, value in iteritems(m.groupdict()): + if value is not None: + stack.append(key) + break + else: + raise RuntimeError('%r wanted to resolve the ' + 'new state dynamically but' + ' no group matched' % + regex) + # direct state name given + else: + stack.append(new_state) + statetokens = self.rules[stack[-1]] + # we are still at the same position and no stack change. + # this means a loop without break condition, avoid that and + # raise error + elif pos2 == pos: + raise RuntimeError('%r yielded empty string without ' + 'stack change' % regex) + # publish new function and start again + pos = pos2 + break + # if loop terminated without break we haven't found a single match + # either we are at the end of the file or we have a problem + else: + # end of text + if pos >= source_length: + return + # something went wrong + raise TemplateSyntaxError('unexpected char %r at %d' % + (source[pos], pos), lineno, + name, filename) diff --git a/python/jinja2/loaders.py b/python/jinja2/loaders.py new file mode 100644 index 0000000..4c79793 --- /dev/null +++ b/python/jinja2/loaders.py @@ -0,0 +1,481 @@ +# -*- coding: utf-8 -*- +""" + jinja2.loaders + ~~~~~~~~~~~~~~ + + Jinja loader classes. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import os +import sys +import weakref +from types import ModuleType +from os import path +from hashlib import sha1 +from jinja2.exceptions import TemplateNotFound +from jinja2.utils import open_if_exists, internalcode +from jinja2._compat import string_types, iteritems + + +def split_template_path(template): + """Split a path into segments and perform a sanity check. If it detects + '..' in the path it will raise a `TemplateNotFound` error. + """ + pieces = [] + for piece in template.split('/'): + if path.sep in piece \ + or (path.altsep and path.altsep in piece) or \ + piece == path.pardir: + raise TemplateNotFound(template) + elif piece and piece != '.': + pieces.append(piece) + return pieces + + +class BaseLoader(object): + """Baseclass for all loaders. Subclass this and override `get_source` to + implement a custom loading mechanism. The environment provides a + `get_template` method that calls the loader's `load` method to get the + :class:`Template` object. + + A very basic example for a loader that looks up templates on the file + system could look like this:: + + from jinja2 import BaseLoader, TemplateNotFound + from os.path import join, exists, getmtime + + class MyLoader(BaseLoader): + + def __init__(self, path): + self.path = path + + def get_source(self, environment, template): + path = join(self.path, template) + if not exists(path): + raise TemplateNotFound(template) + mtime = getmtime(path) + with file(path) as f: + source = f.read().decode('utf-8') + return source, path, lambda: mtime == getmtime(path) + """ + + #: if set to `False` it indicates that the loader cannot provide access + #: to the source of templates. + #: + #: .. versionadded:: 2.4 + has_source_access = True + + def get_source(self, environment, template): + """Get the template source, filename and reload helper for a template. + It's passed the environment and template name and has to return a + tuple in the form ``(source, filename, uptodate)`` or raise a + `TemplateNotFound` error if it can't locate the template. + + The source part of the returned tuple must be the source of the + template as unicode string or a ASCII bytestring. The filename should + be the name of the file on the filesystem if it was loaded from there, + otherwise `None`. The filename is used by python for the tracebacks + if no loader extension is used. + + The last item in the tuple is the `uptodate` function. If auto + reloading is enabled it's always called to check if the template + changed. No arguments are passed so the function must store the + old state somewhere (for example in a closure). If it returns `False` + the template will be reloaded. + """ + if not self.has_source_access: + raise RuntimeError('%s cannot provide access to the source' % + self.__class__.__name__) + raise TemplateNotFound(template) + + def list_templates(self): + """Iterates over all templates. If the loader does not support that + it should raise a :exc:`TypeError` which is the default behavior. + """ + raise TypeError('this loader cannot iterate over all templates') + + @internalcode + def load(self, environment, name, globals=None): + """Loads a template. This method looks up the template in the cache + or loads one by calling :meth:`get_source`. Subclasses should not + override this method as loaders working on collections of other + loaders (such as :class:`PrefixLoader` or :class:`ChoiceLoader`) + will not call this method but `get_source` directly. + """ + code = None + if globals is None: + globals = {} + + # first we try to get the source for this template together + # with the filename and the uptodate function. + source, filename, uptodate = self.get_source(environment, name) + + # try to load the code from the bytecode cache if there is a + # bytecode cache configured. + bcc = environment.bytecode_cache + if bcc is not None: + bucket = bcc.get_bucket(environment, name, filename, source) + code = bucket.code + + # if we don't have code so far (not cached, no longer up to + # date) etc. we compile the template + if code is None: + code = environment.compile(source, name, filename) + + # if the bytecode cache is available and the bucket doesn't + # have a code so far, we give the bucket the new code and put + # it back to the bytecode cache. + if bcc is not None and bucket.code is None: + bucket.code = code + bcc.set_bucket(bucket) + + return environment.template_class.from_code(environment, code, + globals, uptodate) + + +class FileSystemLoader(BaseLoader): + """Loads templates from the file system. This loader can find templates + in folders on the file system and is the preferred way to load them. + + The loader takes the path to the templates as string, or if multiple + locations are wanted a list of them which is then looked up in the + given order:: + + >>> loader = FileSystemLoader('/path/to/templates') + >>> loader = FileSystemLoader(['/path/to/templates', '/other/path']) + + Per default the template encoding is ``'utf-8'`` which can be changed + by setting the `encoding` parameter to something else. + + To follow symbolic links, set the *followlinks* parameter to ``True``:: + + >>> loader = FileSystemLoader('/path/to/templates', followlinks=True) + + .. versionchanged:: 2.8+ + The *followlinks* parameter was added. + """ + + def __init__(self, searchpath, encoding='utf-8', followlinks=False): + if isinstance(searchpath, string_types): + searchpath = [searchpath] + self.searchpath = list(searchpath) + self.encoding = encoding + self.followlinks = followlinks + + def get_source(self, environment, template): + pieces = split_template_path(template) + for searchpath in self.searchpath: + filename = path.join(searchpath, *pieces) + f = open_if_exists(filename) + if f is None: + continue + try: + contents = f.read().decode(self.encoding) + finally: + f.close() + + mtime = path.getmtime(filename) + + def uptodate(): + try: + return path.getmtime(filename) == mtime + except OSError: + return False + return contents, filename, uptodate + raise TemplateNotFound(template) + + def list_templates(self): + found = set() + for searchpath in self.searchpath: + walk_dir = os.walk(searchpath, followlinks=self.followlinks) + for dirpath, dirnames, filenames in walk_dir: + for filename in filenames: + template = os.path.join(dirpath, filename) \ + [len(searchpath):].strip(os.path.sep) \ + .replace(os.path.sep, '/') + if template[:2] == './': + template = template[2:] + if template not in found: + found.add(template) + return sorted(found) + + +class PackageLoader(BaseLoader): + """Load templates from python eggs or packages. It is constructed with + the name of the python package and the path to the templates in that + package:: + + loader = PackageLoader('mypackage', 'views') + + If the package path is not given, ``'templates'`` is assumed. + + Per default the template encoding is ``'utf-8'`` which can be changed + by setting the `encoding` parameter to something else. Due to the nature + of eggs it's only possible to reload templates if the package was loaded + from the file system and not a zip file. + """ + + def __init__(self, package_name, package_path='templates', + encoding='utf-8'): + from pkg_resources import DefaultProvider, ResourceManager, \ + get_provider + provider = get_provider(package_name) + self.encoding = encoding + self.manager = ResourceManager() + self.filesystem_bound = isinstance(provider, DefaultProvider) + self.provider = provider + self.package_path = package_path + + def get_source(self, environment, template): + pieces = split_template_path(template) + p = '/'.join((self.package_path,) + tuple(pieces)) + if not self.provider.has_resource(p): + raise TemplateNotFound(template) + + filename = uptodate = None + if self.filesystem_bound: + filename = self.provider.get_resource_filename(self.manager, p) + mtime = path.getmtime(filename) + def uptodate(): + try: + return path.getmtime(filename) == mtime + except OSError: + return False + + source = self.provider.get_resource_string(self.manager, p) + return source.decode(self.encoding), filename, uptodate + + def list_templates(self): + path = self.package_path + if path[:2] == './': + path = path[2:] + elif path == '.': + path = '' + offset = len(path) + results = [] + def _walk(path): + for filename in self.provider.resource_listdir(path): + fullname = path + '/' + filename + if self.provider.resource_isdir(fullname): + _walk(fullname) + else: + results.append(fullname[offset:].lstrip('/')) + _walk(path) + results.sort() + return results + + +class DictLoader(BaseLoader): + """Loads a template from a python dict. It's passed a dict of unicode + strings bound to template names. This loader is useful for unittesting: + + >>> loader = DictLoader({'index.html': 'source here'}) + + Because auto reloading is rarely useful this is disabled per default. + """ + + def __init__(self, mapping): + self.mapping = mapping + + def get_source(self, environment, template): + if template in self.mapping: + source = self.mapping[template] + return source, None, lambda: source == self.mapping.get(template) + raise TemplateNotFound(template) + + def list_templates(self): + return sorted(self.mapping) + + +class FunctionLoader(BaseLoader): + """A loader that is passed a function which does the loading. The + function receives the name of the template and has to return either + an unicode string with the template source, a tuple in the form ``(source, + filename, uptodatefunc)`` or `None` if the template does not exist. + + >>> def load_template(name): + ... if name == 'index.html': + ... return '...' + ... + >>> loader = FunctionLoader(load_template) + + The `uptodatefunc` is a function that is called if autoreload is enabled + and has to return `True` if the template is still up to date. For more + details have a look at :meth:`BaseLoader.get_source` which has the same + return value. + """ + + def __init__(self, load_func): + self.load_func = load_func + + def get_source(self, environment, template): + rv = self.load_func(template) + if rv is None: + raise TemplateNotFound(template) + elif isinstance(rv, string_types): + return rv, None, None + return rv + + +class PrefixLoader(BaseLoader): + """A loader that is passed a dict of loaders where each loader is bound + to a prefix. The prefix is delimited from the template by a slash per + default, which can be changed by setting the `delimiter` argument to + something else:: + + loader = PrefixLoader({ + 'app1': PackageLoader('mypackage.app1'), + 'app2': PackageLoader('mypackage.app2') + }) + + By loading ``'app1/index.html'`` the file from the app1 package is loaded, + by loading ``'app2/index.html'`` the file from the second. + """ + + def __init__(self, mapping, delimiter='/'): + self.mapping = mapping + self.delimiter = delimiter + + def get_loader(self, template): + try: + prefix, name = template.split(self.delimiter, 1) + loader = self.mapping[prefix] + except (ValueError, KeyError): + raise TemplateNotFound(template) + return loader, name + + def get_source(self, environment, template): + loader, name = self.get_loader(template) + try: + return loader.get_source(environment, name) + except TemplateNotFound: + # re-raise the exception with the correct filename here. + # (the one that includes the prefix) + raise TemplateNotFound(template) + + @internalcode + def load(self, environment, name, globals=None): + loader, local_name = self.get_loader(name) + try: + return loader.load(environment, local_name, globals) + except TemplateNotFound: + # re-raise the exception with the correct filename here. + # (the one that includes the prefix) + raise TemplateNotFound(name) + + def list_templates(self): + result = [] + for prefix, loader in iteritems(self.mapping): + for template in loader.list_templates(): + result.append(prefix + self.delimiter + template) + return result + + +class ChoiceLoader(BaseLoader): + """This loader works like the `PrefixLoader` just that no prefix is + specified. If a template could not be found by one loader the next one + is tried. + + >>> loader = ChoiceLoader([ + ... FileSystemLoader('/path/to/user/templates'), + ... FileSystemLoader('/path/to/system/templates') + ... ]) + + This is useful if you want to allow users to override builtin templates + from a different location. + """ + + def __init__(self, loaders): + self.loaders = loaders + + def get_source(self, environment, template): + for loader in self.loaders: + try: + return loader.get_source(environment, template) + except TemplateNotFound: + pass + raise TemplateNotFound(template) + + @internalcode + def load(self, environment, name, globals=None): + for loader in self.loaders: + try: + return loader.load(environment, name, globals) + except TemplateNotFound: + pass + raise TemplateNotFound(name) + + def list_templates(self): + found = set() + for loader in self.loaders: + found.update(loader.list_templates()) + return sorted(found) + + +class _TemplateModule(ModuleType): + """Like a normal module but with support for weak references""" + + +class ModuleLoader(BaseLoader): + """This loader loads templates from precompiled templates. + + Example usage: + + >>> loader = ChoiceLoader([ + ... ModuleLoader('/path/to/compiled/templates'), + ... FileSystemLoader('/path/to/templates') + ... ]) + + Templates can be precompiled with :meth:`Environment.compile_templates`. + """ + + has_source_access = False + + def __init__(self, path): + package_name = '_jinja2_module_templates_%x' % id(self) + + # create a fake module that looks for the templates in the + # path given. + mod = _TemplateModule(package_name) + if isinstance(path, string_types): + path = [path] + else: + path = list(path) + mod.__path__ = path + + sys.modules[package_name] = weakref.proxy(mod, + lambda x: sys.modules.pop(package_name, None)) + + # the only strong reference, the sys.modules entry is weak + # so that the garbage collector can remove it once the + # loader that created it goes out of business. + self.module = mod + self.package_name = package_name + + @staticmethod + def get_template_key(name): + return 'tmpl_' + sha1(name.encode('utf-8')).hexdigest() + + @staticmethod + def get_module_filename(name): + return ModuleLoader.get_template_key(name) + '.py' + + @internalcode + def load(self, environment, name, globals=None): + key = self.get_template_key(name) + module = '%s.%s' % (self.package_name, key) + mod = getattr(self.module, module, None) + if mod is None: + try: + mod = __import__(module, None, None, ['root']) + except ImportError: + raise TemplateNotFound(name) + + # remove the entry from sys.modules, we only want the attribute + # on the module object we have stored on the loader. + sys.modules.pop(module, None) + + return environment.template_class.from_module_dict( + environment, mod.__dict__, globals) diff --git a/python/jinja2/meta.py b/python/jinja2/meta.py new file mode 100644 index 0000000..7421914 --- /dev/null +++ b/python/jinja2/meta.py @@ -0,0 +1,106 @@ +# -*- coding: utf-8 -*- +""" + jinja2.meta + ~~~~~~~~~~~ + + This module implements various functions that exposes information about + templates that might be interesting for various kinds of applications. + + :copyright: (c) 2017 by the Jinja Team, see AUTHORS for more details. + :license: BSD, see LICENSE for more details. +""" +from jinja2 import nodes +from jinja2.compiler import CodeGenerator +from jinja2._compat import string_types, iteritems + + +class TrackingCodeGenerator(CodeGenerator): + """We abuse the code generator for introspection.""" + + def __init__(self, environment): + CodeGenerator.__init__(self, environment, '<introspection>', + '<introspection>') + self.undeclared_identifiers = set() + + def write(self, x): + """Don't write.""" + + def enter_frame(self, frame): + """Remember all undeclared identifiers.""" + CodeGenerator.enter_frame(self, frame) + for _, (action, param) in iteritems(frame.symbols.loads): + if action == 'resolve': + self.undeclared_identifiers.add(param) + + +def find_undeclared_variables(ast): + """Returns a set of all variables in the AST that will be looked up from + the context at runtime. Because at compile time it's not known which + variables will be used depending on the path the execution takes at + runtime, all variables are returned. + + >>> from jinja2 import Environment, meta + >>> env = Environment() + >>> ast = env.parse('{% set foo = 42 %}{{ bar + foo }}') + >>> meta.find_undeclared_variables(ast) == set(['bar']) + True + + .. admonition:: Implementation + + Internally the code generator is used for finding undeclared variables. + This is good to know because the code generator might raise a + :exc:`TemplateAssertionError` during compilation and as a matter of + fact this function can currently raise that exception as well. + """ + codegen = TrackingCodeGenerator(ast.environment) + codegen.visit(ast) + return codegen.undeclared_identifiers + + +def find_referenced_templates(ast): + """Finds all the referenced templates from the AST. This will return an + iterator over all the hardcoded template extensions, inclusions and + imports. If dynamic inheritance or inclusion is used, `None` will be + yielded. + + >>> from jinja2 import Environment, meta + >>> env = Environment() + >>> ast = env.parse('{% extends "layout.html" %}{% include helper %}') + >>> list(meta.find_referenced_templates(ast)) + ['layout.html', None] + + This function is useful for dependency tracking. For example if you want + to rebuild parts of the website after a layout template has changed. + """ + for node in ast.find_all((nodes.Extends, nodes.FromImport, nodes.Import, + nodes.Include)): + if not isinstance(node.template, nodes.Const): + # a tuple with some non consts in there + if isinstance(node.template, (nodes.Tuple, nodes.List)): + for template_name in node.template.items: + # something const, only yield the strings and ignore + # non-string consts that really just make no sense + if isinstance(template_name, nodes.Const): + if isinstance(template_name.value, string_types): + yield template_name.value + # something dynamic in there + else: + yield None + # something dynamic we don't know about here + else: + yield None + continue + # constant is a basestring, direct template name + if isinstance(node.template.value, string_types): + yield node.template.value + # a tuple or list (latter *should* not happen) made of consts, + # yield the consts that are strings. We could warn here for + # non string values + elif isinstance(node, nodes.Include) and \ + isinstance(node.template.value, (tuple, list)): + for template_name in node.template.value: + if isinstance(template_name, string_types): + yield template_name + # something else we don't care about, we could warn here + else: + yield None diff --git a/python/jinja2/nativetypes.py b/python/jinja2/nativetypes.py new file mode 100644 index 0000000..fe17e41 --- /dev/null +++ b/python/jinja2/nativetypes.py @@ -0,0 +1,220 @@ +import sys +from ast import literal_eval +from itertools import islice, chain +from jinja2 import nodes +from jinja2._compat import text_type +from jinja2.compiler import CodeGenerator, has_safe_repr +from jinja2.environment import Environment, Template +from jinja2.utils import concat, escape + + +def native_concat(nodes): + """Return a native Python type from the list of compiled nodes. If the + result is a single node, its value is returned. Otherwise, the nodes are + concatenated as strings. If the result can be parsed with + :func:`ast.literal_eval`, the parsed value is returned. Otherwise, the + string is returned. + """ + head = list(islice(nodes, 2)) + + if not head: + return None + + if len(head) == 1: + out = head[0] + else: + out = u''.join([text_type(v) for v in chain(head, nodes)]) + + try: + return literal_eval(out) + except (ValueError, SyntaxError, MemoryError): + return out + + +class NativeCodeGenerator(CodeGenerator): + """A code generator which avoids injecting ``to_string()`` calls around the + internal code Jinja uses to render templates. + """ + + def visit_Output(self, node, frame): + """Same as :meth:`CodeGenerator.visit_Output`, but do not call + ``to_string`` on output nodes in generated code. + """ + if self.has_known_extends and frame.require_output_check: + return + + finalize = self.environment.finalize + finalize_context = getattr(finalize, 'contextfunction', False) + finalize_eval = getattr(finalize, 'evalcontextfunction', False) + finalize_env = getattr(finalize, 'environmentfunction', False) + + if finalize is not None: + if finalize_context or finalize_eval: + const_finalize = None + elif finalize_env: + def const_finalize(x): + return finalize(self.environment, x) + else: + const_finalize = finalize + else: + def const_finalize(x): + return x + + # If we are inside a frame that requires output checking, we do so. + outdent_later = False + + if frame.require_output_check: + self.writeline('if parent_template is None:') + self.indent() + outdent_later = True + + # Try to evaluate as many chunks as possible into a static string at + # compile time. + body = [] + + for child in node.nodes: + try: + if const_finalize is None: + raise nodes.Impossible() + + const = child.as_const(frame.eval_ctx) + if not has_safe_repr(const): + raise nodes.Impossible() + except nodes.Impossible: + body.append(child) + continue + + # the frame can't be volatile here, because otherwise the as_const + # function would raise an Impossible exception at that point + try: + if frame.eval_ctx.autoescape: + if hasattr(const, '__html__'): + const = const.__html__() + else: + const = escape(const) + + const = const_finalize(const) + except Exception: + # if something goes wrong here we evaluate the node at runtime + # for easier debugging + body.append(child) + continue + + if body and isinstance(body[-1], list): + body[-1].append(const) + else: + body.append([const]) + + # if we have less than 3 nodes or a buffer we yield or extend/append + if len(body) < 3 or frame.buffer is not None: + if frame.buffer is not None: + # for one item we append, for more we extend + if len(body) == 1: + self.writeline('%s.append(' % frame.buffer) + else: + self.writeline('%s.extend((' % frame.buffer) + + self.indent() + + for item in body: + if isinstance(item, list): + val = repr(native_concat(item)) + + if frame.buffer is None: + self.writeline('yield ' + val) + else: + self.writeline(val + ',') + else: + if frame.buffer is None: + self.writeline('yield ', item) + else: + self.newline(item) + + close = 0 + + if finalize is not None: + self.write('environment.finalize(') + + if finalize_context: + self.write('context, ') + + close += 1 + + self.visit(item, frame) + + if close > 0: + self.write(')' * close) + + if frame.buffer is not None: + self.write(',') + + if frame.buffer is not None: + # close the open parentheses + self.outdent() + self.writeline(len(body) == 1 and ')' or '))') + + # otherwise we create a format string as this is faster in that case + else: + format = [] + arguments = [] + + for item in body: + if isinstance(item, list): + format.append(native_concat(item).replace('%', '%%')) + else: + format.append('%s') + arguments.append(item) + + self.writeline('yield ') + self.write(repr(concat(format)) + ' % (') + self.indent() + + for argument in arguments: + self.newline(argument) + close = 0 + + if finalize is not None: + self.write('environment.finalize(') + + if finalize_context: + self.write('context, ') + elif finalize_eval: + self.write('context.eval_ctx, ') + elif finalize_env: + self.write('environment, ') + + close += 1 + + self.visit(argument, frame) + self.write(')' * close + ', ') + + self.outdent() + self.writeline(')') + + if outdent_later: + self.outdent() + + +class NativeTemplate(Template): + def render(self, *args, **kwargs): + """Render the template to produce a native Python type. If the result + is a single node, its value is returned. Otherwise, the nodes are + concatenated as strings. If the result can be parsed with + :func:`ast.literal_eval`, the parsed value is returned. Otherwise, the + string is returned. + """ + vars = dict(*args, **kwargs) + + try: + return native_concat(self.root_render_func(self.new_context(vars))) + except Exception: + exc_info = sys.exc_info() + + return self.environment.handle_exception(exc_info, True) + + +class NativeEnvironment(Environment): + """An environment that renders templates to native Python types.""" + + code_generator_class = NativeCodeGenerator + template_class = NativeTemplate diff --git a/python/jinja2/nodes.py b/python/jinja2/nodes.py new file mode 100644 index 0000000..4d9a01a --- /dev/null +++ b/python/jinja2/nodes.py @@ -0,0 +1,999 @@ +# -*- coding: utf-8 -*- +""" + jinja2.nodes + ~~~~~~~~~~~~ + + This module implements additional nodes derived from the ast base node. + + It also provides some node tree helper functions like `in_lineno` and + `get_nodes` used by the parser and translator in order to normalize + python and jinja nodes. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import types +import operator + +from collections import deque +from jinja2.utils import Markup +from jinja2._compat import izip, with_metaclass, text_type, PY2 + + +#: the types we support for context functions +_context_function_types = (types.FunctionType, types.MethodType) + + +_binop_to_func = { + '*': operator.mul, + '/': operator.truediv, + '//': operator.floordiv, + '**': operator.pow, + '%': operator.mod, + '+': operator.add, + '-': operator.sub +} + +_uaop_to_func = { + 'not': operator.not_, + '+': operator.pos, + '-': operator.neg +} + +_cmpop_to_func = { + 'eq': operator.eq, + 'ne': operator.ne, + 'gt': operator.gt, + 'gteq': operator.ge, + 'lt': operator.lt, + 'lteq': operator.le, + 'in': lambda a, b: a in b, + 'notin': lambda a, b: a not in b +} + + +class Impossible(Exception): + """Raised if the node could not perform a requested action.""" + + +class NodeType(type): + """A metaclass for nodes that handles the field and attribute + inheritance. fields and attributes from the parent class are + automatically forwarded to the child.""" + + def __new__(cls, name, bases, d): + for attr in 'fields', 'attributes': + storage = [] + storage.extend(getattr(bases[0], attr, ())) + storage.extend(d.get(attr, ())) + assert len(bases) == 1, 'multiple inheritance not allowed' + assert len(storage) == len(set(storage)), 'layout conflict' + d[attr] = tuple(storage) + d.setdefault('abstract', False) + return type.__new__(cls, name, bases, d) + + +class EvalContext(object): + """Holds evaluation time information. Custom attributes can be attached + to it in extensions. + """ + + def __init__(self, environment, template_name=None): + self.environment = environment + if callable(environment.autoescape): + self.autoescape = environment.autoescape(template_name) + else: + self.autoescape = environment.autoescape + self.volatile = False + + def save(self): + return self.__dict__.copy() + + def revert(self, old): + self.__dict__.clear() + self.__dict__.update(old) + + +def get_eval_context(node, ctx): + if ctx is None: + if node.environment is None: + raise RuntimeError('if no eval context is passed, the ' + 'node must have an attached ' + 'environment.') + return EvalContext(node.environment) + return ctx + + +class Node(with_metaclass(NodeType, object)): + """Baseclass for all Jinja2 nodes. There are a number of nodes available + of different types. There are four major types: + + - :class:`Stmt`: statements + - :class:`Expr`: expressions + - :class:`Helper`: helper nodes + - :class:`Template`: the outermost wrapper node + + All nodes have fields and attributes. Fields may be other nodes, lists, + or arbitrary values. Fields are passed to the constructor as regular + positional arguments, attributes as keyword arguments. Each node has + two attributes: `lineno` (the line number of the node) and `environment`. + The `environment` attribute is set at the end of the parsing process for + all nodes automatically. + """ + fields = () + attributes = ('lineno', 'environment') + abstract = True + + def __init__(self, *fields, **attributes): + if self.abstract: + raise TypeError('abstract nodes are not instanciable') + if fields: + if len(fields) != len(self.fields): + if not self.fields: + raise TypeError('%r takes 0 arguments' % + self.__class__.__name__) + raise TypeError('%r takes 0 or %d argument%s' % ( + self.__class__.__name__, + len(self.fields), + len(self.fields) != 1 and 's' or '' + )) + for name, arg in izip(self.fields, fields): + setattr(self, name, arg) + for attr in self.attributes: + setattr(self, attr, attributes.pop(attr, None)) + if attributes: + raise TypeError('unknown attribute %r' % + next(iter(attributes))) + + def iter_fields(self, exclude=None, only=None): + """This method iterates over all fields that are defined and yields + ``(key, value)`` tuples. Per default all fields are returned, but + it's possible to limit that to some fields by providing the `only` + parameter or to exclude some using the `exclude` parameter. Both + should be sets or tuples of field names. + """ + for name in self.fields: + if (exclude is only is None) or \ + (exclude is not None and name not in exclude) or \ + (only is not None and name in only): + try: + yield name, getattr(self, name) + except AttributeError: + pass + + def iter_child_nodes(self, exclude=None, only=None): + """Iterates over all direct child nodes of the node. This iterates + over all fields and yields the values of they are nodes. If the value + of a field is a list all the nodes in that list are returned. + """ + for field, item in self.iter_fields(exclude, only): + if isinstance(item, list): + for n in item: + if isinstance(n, Node): + yield n + elif isinstance(item, Node): + yield item + + def find(self, node_type): + """Find the first node of a given type. If no such node exists the + return value is `None`. + """ + for result in self.find_all(node_type): + return result + + def find_all(self, node_type): + """Find all the nodes of a given type. If the type is a tuple, + the check is performed for any of the tuple items. + """ + for child in self.iter_child_nodes(): + if isinstance(child, node_type): + yield child + for result in child.find_all(node_type): + yield result + + def set_ctx(self, ctx): + """Reset the context of a node and all child nodes. Per default the + parser will all generate nodes that have a 'load' context as it's the + most common one. This method is used in the parser to set assignment + targets and other nodes to a store context. + """ + todo = deque([self]) + while todo: + node = todo.popleft() + if 'ctx' in node.fields: + node.ctx = ctx + todo.extend(node.iter_child_nodes()) + return self + + def set_lineno(self, lineno, override=False): + """Set the line numbers of the node and children.""" + todo = deque([self]) + while todo: + node = todo.popleft() + if 'lineno' in node.attributes: + if node.lineno is None or override: + node.lineno = lineno + todo.extend(node.iter_child_nodes()) + return self + + def set_environment(self, environment): + """Set the environment for all nodes.""" + todo = deque([self]) + while todo: + node = todo.popleft() + node.environment = environment + todo.extend(node.iter_child_nodes()) + return self + + def __eq__(self, other): + return type(self) is type(other) and \ + tuple(self.iter_fields()) == tuple(other.iter_fields()) + + def __ne__(self, other): + return not self.__eq__(other) + + # Restore Python 2 hashing behavior on Python 3 + __hash__ = object.__hash__ + + def __repr__(self): + return '%s(%s)' % ( + self.__class__.__name__, + ', '.join('%s=%r' % (arg, getattr(self, arg, None)) for + arg in self.fields) + ) + + def dump(self): + def _dump(node): + if not isinstance(node, Node): + buf.append(repr(node)) + return + + buf.append('nodes.%s(' % node.__class__.__name__) + if not node.fields: + buf.append(')') + return + for idx, field in enumerate(node.fields): + if idx: + buf.append(', ') + value = getattr(node, field) + if isinstance(value, list): + buf.append('[') + for idx, item in enumerate(value): + if idx: + buf.append(', ') + _dump(item) + buf.append(']') + else: + _dump(value) + buf.append(')') + buf = [] + _dump(self) + return ''.join(buf) + + + +class Stmt(Node): + """Base node for all statements.""" + abstract = True + + +class Helper(Node): + """Nodes that exist in a specific context only.""" + abstract = True + + +class Template(Node): + """Node that represents a template. This must be the outermost node that + is passed to the compiler. + """ + fields = ('body',) + + +class Output(Stmt): + """A node that holds multiple expressions which are then printed out. + This is used both for the `print` statement and the regular template data. + """ + fields = ('nodes',) + + +class Extends(Stmt): + """Represents an extends statement.""" + fields = ('template',) + + +class For(Stmt): + """The for loop. `target` is the target for the iteration (usually a + :class:`Name` or :class:`Tuple`), `iter` the iterable. `body` is a list + of nodes that are used as loop-body, and `else_` a list of nodes for the + `else` block. If no else node exists it has to be an empty list. + + For filtered nodes an expression can be stored as `test`, otherwise `None`. + """ + fields = ('target', 'iter', 'body', 'else_', 'test', 'recursive') + + +class If(Stmt): + """If `test` is true, `body` is rendered, else `else_`.""" + fields = ('test', 'body', 'elif_', 'else_') + + +class Macro(Stmt): + """A macro definition. `name` is the name of the macro, `args` a list of + arguments and `defaults` a list of defaults if there are any. `body` is + a list of nodes for the macro body. + """ + fields = ('name', 'args', 'defaults', 'body') + + +class CallBlock(Stmt): + """Like a macro without a name but a call instead. `call` is called with + the unnamed macro as `caller` argument this node holds. + """ + fields = ('call', 'args', 'defaults', 'body') + + +class FilterBlock(Stmt): + """Node for filter sections.""" + fields = ('body', 'filter') + + +class With(Stmt): + """Specific node for with statements. In older versions of Jinja the + with statement was implemented on the base of the `Scope` node instead. + + .. versionadded:: 2.9.3 + """ + fields = ('targets', 'values', 'body') + + +class Block(Stmt): + """A node that represents a block.""" + fields = ('name', 'body', 'scoped') + + +class Include(Stmt): + """A node that represents the include tag.""" + fields = ('template', 'with_context', 'ignore_missing') + + +class Import(Stmt): + """A node that represents the import tag.""" + fields = ('template', 'target', 'with_context') + + +class FromImport(Stmt): + """A node that represents the from import tag. It's important to not + pass unsafe names to the name attribute. The compiler translates the + attribute lookups directly into getattr calls and does *not* use the + subscript callback of the interface. As exported variables may not + start with double underscores (which the parser asserts) this is not a + problem for regular Jinja code, but if this node is used in an extension + extra care must be taken. + + The list of names may contain tuples if aliases are wanted. + """ + fields = ('template', 'names', 'with_context') + + +class ExprStmt(Stmt): + """A statement that evaluates an expression and discards the result.""" + fields = ('node',) + + +class Assign(Stmt): + """Assigns an expression to a target.""" + fields = ('target', 'node') + + +class AssignBlock(Stmt): + """Assigns a block to a target.""" + fields = ('target', 'filter', 'body') + + +class Expr(Node): + """Baseclass for all expressions.""" + abstract = True + + def as_const(self, eval_ctx=None): + """Return the value of the expression as constant or raise + :exc:`Impossible` if this was not possible. + + An :class:`EvalContext` can be provided, if none is given + a default context is created which requires the nodes to have + an attached environment. + + .. versionchanged:: 2.4 + the `eval_ctx` parameter was added. + """ + raise Impossible() + + def can_assign(self): + """Check if it's possible to assign something to this node.""" + return False + + +class BinExpr(Expr): + """Baseclass for all binary expressions.""" + fields = ('left', 'right') + operator = None + abstract = True + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + # intercepted operators cannot be folded at compile time + if self.environment.sandboxed and \ + self.operator in self.environment.intercepted_binops: + raise Impossible() + f = _binop_to_func[self.operator] + try: + return f(self.left.as_const(eval_ctx), self.right.as_const(eval_ctx)) + except Exception: + raise Impossible() + + +class UnaryExpr(Expr): + """Baseclass for all unary expressions.""" + fields = ('node',) + operator = None + abstract = True + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + # intercepted operators cannot be folded at compile time + if self.environment.sandboxed and \ + self.operator in self.environment.intercepted_unops: + raise Impossible() + f = _uaop_to_func[self.operator] + try: + return f(self.node.as_const(eval_ctx)) + except Exception: + raise Impossible() + + +class Name(Expr): + """Looks up a name or stores a value in a name. + The `ctx` of the node can be one of the following values: + + - `store`: store a value in the name + - `load`: load that name + - `param`: like `store` but if the name was defined as function parameter. + """ + fields = ('name', 'ctx') + + def can_assign(self): + return self.name not in ('true', 'false', 'none', + 'True', 'False', 'None') + + +class NSRef(Expr): + """Reference to a namespace value assignment""" + fields = ('name', 'attr') + + def can_assign(self): + # We don't need any special checks here; NSRef assignments have a + # runtime check to ensure the target is a namespace object which will + # have been checked already as it is created using a normal assignment + # which goes through a `Name` node. + return True + + +class Literal(Expr): + """Baseclass for literals.""" + abstract = True + + +class Const(Literal): + """All constant values. The parser will return this node for simple + constants such as ``42`` or ``"foo"`` but it can be used to store more + complex values such as lists too. Only constants with a safe + representation (objects where ``eval(repr(x)) == x`` is true). + """ + fields = ('value',) + + def as_const(self, eval_ctx=None): + rv = self.value + if PY2 and type(rv) is text_type and \ + self.environment.policies['compiler.ascii_str']: + try: + rv = rv.encode('ascii') + except UnicodeError: + pass + return rv + + @classmethod + def from_untrusted(cls, value, lineno=None, environment=None): + """Return a const object if the value is representable as + constant value in the generated code, otherwise it will raise + an `Impossible` exception. + """ + from .compiler import has_safe_repr + if not has_safe_repr(value): + raise Impossible() + return cls(value, lineno=lineno, environment=environment) + + +class TemplateData(Literal): + """A constant template string.""" + fields = ('data',) + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + if eval_ctx.volatile: + raise Impossible() + if eval_ctx.autoescape: + return Markup(self.data) + return self.data + + +class Tuple(Literal): + """For loop unpacking and some other things like multiple arguments + for subscripts. Like for :class:`Name` `ctx` specifies if the tuple + is used for loading the names or storing. + """ + fields = ('items', 'ctx') + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return tuple(x.as_const(eval_ctx) for x in self.items) + + def can_assign(self): + for item in self.items: + if not item.can_assign(): + return False + return True + + +class List(Literal): + """Any list literal such as ``[1, 2, 3]``""" + fields = ('items',) + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return [x.as_const(eval_ctx) for x in self.items] + + +class Dict(Literal): + """Any dict literal such as ``{1: 2, 3: 4}``. The items must be a list of + :class:`Pair` nodes. + """ + fields = ('items',) + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return dict(x.as_const(eval_ctx) for x in self.items) + + +class Pair(Helper): + """A key, value pair for dicts.""" + fields = ('key', 'value') + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return self.key.as_const(eval_ctx), self.value.as_const(eval_ctx) + + +class Keyword(Helper): + """A key, value pair for keyword arguments where key is a string.""" + fields = ('key', 'value') + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return self.key, self.value.as_const(eval_ctx) + + +class CondExpr(Expr): + """A conditional expression (inline if expression). (``{{ + foo if bar else baz }}``) + """ + fields = ('test', 'expr1', 'expr2') + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + if self.test.as_const(eval_ctx): + return self.expr1.as_const(eval_ctx) + + # if we evaluate to an undefined object, we better do that at runtime + if self.expr2 is None: + raise Impossible() + + return self.expr2.as_const(eval_ctx) + + +def args_as_const(node, eval_ctx): + args = [x.as_const(eval_ctx) for x in node.args] + kwargs = dict(x.as_const(eval_ctx) for x in node.kwargs) + + if node.dyn_args is not None: + try: + args.extend(node.dyn_args.as_const(eval_ctx)) + except Exception: + raise Impossible() + + if node.dyn_kwargs is not None: + try: + kwargs.update(node.dyn_kwargs.as_const(eval_ctx)) + except Exception: + raise Impossible() + + return args, kwargs + + +class Filter(Expr): + """This node applies a filter on an expression. `name` is the name of + the filter, the rest of the fields are the same as for :class:`Call`. + + If the `node` of a filter is `None` the contents of the last buffer are + filtered. Buffers are created by macros and filter blocks. + """ + + fields = ('node', 'name', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs') + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + + if eval_ctx.volatile or self.node is None: + raise Impossible() + + # we have to be careful here because we call filter_ below. + # if this variable would be called filter, 2to3 would wrap the + # call in a list beause it is assuming we are talking about the + # builtin filter function here which no longer returns a list in + # python 3. because of that, do not rename filter_ to filter! + filter_ = self.environment.filters.get(self.name) + + if filter_ is None or getattr(filter_, 'contextfilter', False): + raise Impossible() + + # We cannot constant handle async filters, so we need to make sure + # to not go down this path. + if ( + eval_ctx.environment.is_async + and getattr(filter_, 'asyncfiltervariant', False) + ): + raise Impossible() + + args, kwargs = args_as_const(self, eval_ctx) + args.insert(0, self.node.as_const(eval_ctx)) + + if getattr(filter_, 'evalcontextfilter', False): + args.insert(0, eval_ctx) + elif getattr(filter_, 'environmentfilter', False): + args.insert(0, self.environment) + + try: + return filter_(*args, **kwargs) + except Exception: + raise Impossible() + + +class Test(Expr): + """Applies a test on an expression. `name` is the name of the test, the + rest of the fields are the same as for :class:`Call`. + """ + + fields = ('node', 'name', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs') + + def as_const(self, eval_ctx=None): + test = self.environment.tests.get(self.name) + + if test is None: + raise Impossible() + + eval_ctx = get_eval_context(self, eval_ctx) + args, kwargs = args_as_const(self, eval_ctx) + args.insert(0, self.node.as_const(eval_ctx)) + + try: + return test(*args, **kwargs) + except Exception: + raise Impossible() + + +class Call(Expr): + """Calls an expression. `args` is a list of arguments, `kwargs` a list + of keyword arguments (list of :class:`Keyword` nodes), and `dyn_args` + and `dyn_kwargs` has to be either `None` or a node that is used as + node for dynamic positional (``*args``) or keyword (``**kwargs``) + arguments. + """ + fields = ('node', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs') + + +class Getitem(Expr): + """Get an attribute or item from an expression and prefer the item.""" + fields = ('node', 'arg', 'ctx') + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + if self.ctx != 'load': + raise Impossible() + try: + return self.environment.getitem(self.node.as_const(eval_ctx), + self.arg.as_const(eval_ctx)) + except Exception: + raise Impossible() + + def can_assign(self): + return False + + +class Getattr(Expr): + """Get an attribute or item from an expression that is a ascii-only + bytestring and prefer the attribute. + """ + fields = ('node', 'attr', 'ctx') + + def as_const(self, eval_ctx=None): + if self.ctx != 'load': + raise Impossible() + try: + eval_ctx = get_eval_context(self, eval_ctx) + return self.environment.getattr(self.node.as_const(eval_ctx), + self.attr) + except Exception: + raise Impossible() + + def can_assign(self): + return False + + +class Slice(Expr): + """Represents a slice object. This must only be used as argument for + :class:`Subscript`. + """ + fields = ('start', 'stop', 'step') + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + def const(obj): + if obj is None: + return None + return obj.as_const(eval_ctx) + return slice(const(self.start), const(self.stop), const(self.step)) + + +class Concat(Expr): + """Concatenates the list of expressions provided after converting them to + unicode. + """ + fields = ('nodes',) + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return ''.join(text_type(x.as_const(eval_ctx)) for x in self.nodes) + + +class Compare(Expr): + """Compares an expression with some other expressions. `ops` must be a + list of :class:`Operand`\\s. + """ + fields = ('expr', 'ops') + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + result = value = self.expr.as_const(eval_ctx) + try: + for op in self.ops: + new_value = op.expr.as_const(eval_ctx) + result = _cmpop_to_func[op.op](value, new_value) + value = new_value + except Exception: + raise Impossible() + return result + + +class Operand(Helper): + """Holds an operator and an expression.""" + fields = ('op', 'expr') + +if __debug__: + Operand.__doc__ += '\nThe following operators are available: ' + \ + ', '.join(sorted('``%s``' % x for x in set(_binop_to_func) | + set(_uaop_to_func) | set(_cmpop_to_func))) + + +class Mul(BinExpr): + """Multiplies the left with the right node.""" + operator = '*' + + +class Div(BinExpr): + """Divides the left by the right node.""" + operator = '/' + + +class FloorDiv(BinExpr): + """Divides the left by the right node and truncates conver the + result into an integer by truncating. + """ + operator = '//' + + +class Add(BinExpr): + """Add the left to the right node.""" + operator = '+' + + +class Sub(BinExpr): + """Subtract the right from the left node.""" + operator = '-' + + +class Mod(BinExpr): + """Left modulo right.""" + operator = '%' + + +class Pow(BinExpr): + """Left to the power of right.""" + operator = '**' + + +class And(BinExpr): + """Short circuited AND.""" + operator = 'and' + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return self.left.as_const(eval_ctx) and self.right.as_const(eval_ctx) + + +class Or(BinExpr): + """Short circuited OR.""" + operator = 'or' + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return self.left.as_const(eval_ctx) or self.right.as_const(eval_ctx) + + +class Not(UnaryExpr): + """Negate the expression.""" + operator = 'not' + + +class Neg(UnaryExpr): + """Make the expression negative.""" + operator = '-' + + +class Pos(UnaryExpr): + """Make the expression positive (noop for most expressions)""" + operator = '+' + + +# Helpers for extensions + + +class EnvironmentAttribute(Expr): + """Loads an attribute from the environment object. This is useful for + extensions that want to call a callback stored on the environment. + """ + fields = ('name',) + + +class ExtensionAttribute(Expr): + """Returns the attribute of an extension bound to the environment. + The identifier is the identifier of the :class:`Extension`. + + This node is usually constructed by calling the + :meth:`~jinja2.ext.Extension.attr` method on an extension. + """ + fields = ('identifier', 'name') + + +class ImportedName(Expr): + """If created with an import name the import name is returned on node + access. For example ``ImportedName('cgi.escape')`` returns the `escape` + function from the cgi module on evaluation. Imports are optimized by the + compiler so there is no need to assign them to local variables. + """ + fields = ('importname',) + + +class InternalName(Expr): + """An internal name in the compiler. You cannot create these nodes + yourself but the parser provides a + :meth:`~jinja2.parser.Parser.free_identifier` method that creates + a new identifier for you. This identifier is not available from the + template and is not threated specially by the compiler. + """ + fields = ('name',) + + def __init__(self): + raise TypeError('Can\'t create internal names. Use the ' + '`free_identifier` method on a parser.') + + +class MarkSafe(Expr): + """Mark the wrapped expression as safe (wrap it as `Markup`).""" + fields = ('expr',) + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + return Markup(self.expr.as_const(eval_ctx)) + + +class MarkSafeIfAutoescape(Expr): + """Mark the wrapped expression as safe (wrap it as `Markup`) but + only if autoescaping is active. + + .. versionadded:: 2.5 + """ + fields = ('expr',) + + def as_const(self, eval_ctx=None): + eval_ctx = get_eval_context(self, eval_ctx) + if eval_ctx.volatile: + raise Impossible() + expr = self.expr.as_const(eval_ctx) + if eval_ctx.autoescape: + return Markup(expr) + return expr + + +class ContextReference(Expr): + """Returns the current template context. It can be used like a + :class:`Name` node, with a ``'load'`` ctx and will return the + current :class:`~jinja2.runtime.Context` object. + + Here an example that assigns the current template name to a + variable named `foo`:: + + Assign(Name('foo', ctx='store'), + Getattr(ContextReference(), 'name')) + """ + + +class Continue(Stmt): + """Continue a loop.""" + + +class Break(Stmt): + """Break a loop.""" + + +class Scope(Stmt): + """An artificial scope.""" + fields = ('body',) + + +class OverlayScope(Stmt): + """An overlay scope for extensions. This is a largely unoptimized scope + that however can be used to introduce completely arbitrary variables into + a sub scope from a dictionary or dictionary like object. The `context` + field has to evaluate to a dictionary object. + + Example usage:: + + OverlayScope(context=self.call_method('get_context'), + body=[...]) + + .. versionadded:: 2.10 + """ + fields = ('context', 'body') + + +class EvalContextModifier(Stmt): + """Modifies the eval context. For each option that should be modified, + a :class:`Keyword` has to be added to the :attr:`options` list. + + Example to change the `autoescape` setting:: + + EvalContextModifier(options=[Keyword('autoescape', Const(True))]) + """ + fields = ('options',) + + +class ScopedEvalContextModifier(EvalContextModifier): + """Modifies the eval context and reverts it later. Works exactly like + :class:`EvalContextModifier` but will only modify the + :class:`~jinja2.nodes.EvalContext` for nodes in the :attr:`body`. + """ + fields = ('body',) + + +# make sure nobody creates custom nodes +def _failing_new(*args, **kwargs): + raise TypeError('can\'t create custom node types') +NodeType.__new__ = staticmethod(_failing_new); del _failing_new diff --git a/python/jinja2/optimizer.py b/python/jinja2/optimizer.py new file mode 100644 index 0000000..65ab3ce --- /dev/null +++ b/python/jinja2/optimizer.py @@ -0,0 +1,49 @@ +# -*- coding: utf-8 -*- +""" + jinja2.optimizer + ~~~~~~~~~~~~~~~~ + + The jinja optimizer is currently trying to constant fold a few expressions + and modify the AST in place so that it should be easier to evaluate it. + + Because the AST does not contain all the scoping information and the + compiler has to find that out, we cannot do all the optimizations we + want. For example loop unrolling doesn't work because unrolled loops would + have a different scoping. + + The solution would be a second syntax tree that has the scoping rules stored. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD. +""" +from jinja2 import nodes +from jinja2.visitor import NodeTransformer + + +def optimize(node, environment): + """The context hint can be used to perform an static optimization + based on the context given.""" + optimizer = Optimizer(environment) + return optimizer.visit(node) + + +class Optimizer(NodeTransformer): + + def __init__(self, environment): + self.environment = environment + + def fold(self, node, eval_ctx=None): + """Do constant folding.""" + node = self.generic_visit(node) + try: + return nodes.Const.from_untrusted(node.as_const(eval_ctx), + lineno=node.lineno, + environment=self.environment) + except nodes.Impossible: + return node + + visit_Add = visit_Sub = visit_Mul = visit_Div = visit_FloorDiv = \ + visit_Pow = visit_Mod = visit_And = visit_Or = visit_Pos = visit_Neg = \ + visit_Not = visit_Compare = visit_Getitem = visit_Getattr = visit_Call = \ + visit_Filter = visit_Test = visit_CondExpr = fold + del fold diff --git a/python/jinja2/parser.py b/python/jinja2/parser.py new file mode 100644 index 0000000..ed00d97 --- /dev/null +++ b/python/jinja2/parser.py @@ -0,0 +1,903 @@ +# -*- coding: utf-8 -*- +""" + jinja2.parser + ~~~~~~~~~~~~~ + + Implements the template parser. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +from jinja2 import nodes +from jinja2.exceptions import TemplateSyntaxError, TemplateAssertionError +from jinja2.lexer import describe_token, describe_token_expr +from jinja2._compat import imap + + +_statement_keywords = frozenset(['for', 'if', 'block', 'extends', 'print', + 'macro', 'include', 'from', 'import', + 'set', 'with', 'autoescape']) +_compare_operators = frozenset(['eq', 'ne', 'lt', 'lteq', 'gt', 'gteq']) + +_math_nodes = { + 'add': nodes.Add, + 'sub': nodes.Sub, + 'mul': nodes.Mul, + 'div': nodes.Div, + 'floordiv': nodes.FloorDiv, + 'mod': nodes.Mod, +} + + +class Parser(object): + """This is the central parsing class Jinja2 uses. It's passed to + extensions and can be used to parse expressions or statements. + """ + + def __init__(self, environment, source, name=None, filename=None, + state=None): + self.environment = environment + self.stream = environment._tokenize(source, name, filename, state) + self.name = name + self.filename = filename + self.closed = False + self.extensions = {} + for extension in environment.iter_extensions(): + for tag in extension.tags: + self.extensions[tag] = extension.parse + self._last_identifier = 0 + self._tag_stack = [] + self._end_token_stack = [] + + def fail(self, msg, lineno=None, exc=TemplateSyntaxError): + """Convenience method that raises `exc` with the message, passed + line number or last line number as well as the current name and + filename. + """ + if lineno is None: + lineno = self.stream.current.lineno + raise exc(msg, lineno, self.name, self.filename) + + def _fail_ut_eof(self, name, end_token_stack, lineno): + expected = [] + for exprs in end_token_stack: + expected.extend(imap(describe_token_expr, exprs)) + if end_token_stack: + currently_looking = ' or '.join( + "'%s'" % describe_token_expr(expr) + for expr in end_token_stack[-1]) + else: + currently_looking = None + + if name is None: + message = ['Unexpected end of template.'] + else: + message = ['Encountered unknown tag \'%s\'.' % name] + + if currently_looking: + if name is not None and name in expected: + message.append('You probably made a nesting mistake. Jinja ' + 'is expecting this tag, but currently looking ' + 'for %s.' % currently_looking) + else: + message.append('Jinja was looking for the following tags: ' + '%s.' % currently_looking) + + if self._tag_stack: + message.append('The innermost block that needs to be ' + 'closed is \'%s\'.' % self._tag_stack[-1]) + + self.fail(' '.join(message), lineno) + + def fail_unknown_tag(self, name, lineno=None): + """Called if the parser encounters an unknown tag. Tries to fail + with a human readable error message that could help to identify + the problem. + """ + return self._fail_ut_eof(name, self._end_token_stack, lineno) + + def fail_eof(self, end_tokens=None, lineno=None): + """Like fail_unknown_tag but for end of template situations.""" + stack = list(self._end_token_stack) + if end_tokens is not None: + stack.append(end_tokens) + return self._fail_ut_eof(None, stack, lineno) + + def is_tuple_end(self, extra_end_rules=None): + """Are we at the end of a tuple?""" + if self.stream.current.type in ('variable_end', 'block_end', 'rparen'): + return True + elif extra_end_rules is not None: + return self.stream.current.test_any(extra_end_rules) + return False + + def free_identifier(self, lineno=None): + """Return a new free identifier as :class:`~jinja2.nodes.InternalName`.""" + self._last_identifier += 1 + rv = object.__new__(nodes.InternalName) + nodes.Node.__init__(rv, 'fi%d' % self._last_identifier, lineno=lineno) + return rv + + def parse_statement(self): + """Parse a single statement.""" + token = self.stream.current + if token.type != 'name': + self.fail('tag name expected', token.lineno) + self._tag_stack.append(token.value) + pop_tag = True + try: + if token.value in _statement_keywords: + return getattr(self, 'parse_' + self.stream.current.value)() + if token.value == 'call': + return self.parse_call_block() + if token.value == 'filter': + return self.parse_filter_block() + ext = self.extensions.get(token.value) + if ext is not None: + return ext(self) + + # did not work out, remove the token we pushed by accident + # from the stack so that the unknown tag fail function can + # produce a proper error message. + self._tag_stack.pop() + pop_tag = False + self.fail_unknown_tag(token.value, token.lineno) + finally: + if pop_tag: + self._tag_stack.pop() + + def parse_statements(self, end_tokens, drop_needle=False): + """Parse multiple statements into a list until one of the end tokens + is reached. This is used to parse the body of statements as it also + parses template data if appropriate. The parser checks first if the + current token is a colon and skips it if there is one. Then it checks + for the block end and parses until if one of the `end_tokens` is + reached. Per default the active token in the stream at the end of + the call is the matched end token. If this is not wanted `drop_needle` + can be set to `True` and the end token is removed. + """ + # the first token may be a colon for python compatibility + self.stream.skip_if('colon') + + # in the future it would be possible to add whole code sections + # by adding some sort of end of statement token and parsing those here. + self.stream.expect('block_end') + result = self.subparse(end_tokens) + + # we reached the end of the template too early, the subparser + # does not check for this, so we do that now + if self.stream.current.type == 'eof': + self.fail_eof(end_tokens) + + if drop_needle: + next(self.stream) + return result + + def parse_set(self): + """Parse an assign statement.""" + lineno = next(self.stream).lineno + target = self.parse_assign_target(with_namespace=True) + if self.stream.skip_if('assign'): + expr = self.parse_tuple() + return nodes.Assign(target, expr, lineno=lineno) + filter_node = self.parse_filter(None) + body = self.parse_statements(('name:endset',), + drop_needle=True) + return nodes.AssignBlock(target, filter_node, body, lineno=lineno) + + def parse_for(self): + """Parse a for loop.""" + lineno = self.stream.expect('name:for').lineno + target = self.parse_assign_target(extra_end_rules=('name:in',)) + self.stream.expect('name:in') + iter = self.parse_tuple(with_condexpr=False, + extra_end_rules=('name:recursive',)) + test = None + if self.stream.skip_if('name:if'): + test = self.parse_expression() + recursive = self.stream.skip_if('name:recursive') + body = self.parse_statements(('name:endfor', 'name:else')) + if next(self.stream).value == 'endfor': + else_ = [] + else: + else_ = self.parse_statements(('name:endfor',), drop_needle=True) + return nodes.For(target, iter, body, else_, test, + recursive, lineno=lineno) + + def parse_if(self): + """Parse an if construct.""" + node = result = nodes.If(lineno=self.stream.expect('name:if').lineno) + while 1: + node.test = self.parse_tuple(with_condexpr=False) + node.body = self.parse_statements(('name:elif', 'name:else', + 'name:endif')) + node.elif_ = [] + node.else_ = [] + token = next(self.stream) + if token.test('name:elif'): + node = nodes.If(lineno=self.stream.current.lineno) + result.elif_.append(node) + continue + elif token.test('name:else'): + result.else_ = self.parse_statements(('name:endif',), + drop_needle=True) + break + return result + + def parse_with(self): + node = nodes.With(lineno=next(self.stream).lineno) + targets = [] + values = [] + while self.stream.current.type != 'block_end': + lineno = self.stream.current.lineno + if targets: + self.stream.expect('comma') + target = self.parse_assign_target() + target.set_ctx('param') + targets.append(target) + self.stream.expect('assign') + values.append(self.parse_expression()) + node.targets = targets + node.values = values + node.body = self.parse_statements(('name:endwith',), + drop_needle=True) + return node + + def parse_autoescape(self): + node = nodes.ScopedEvalContextModifier(lineno=next(self.stream).lineno) + node.options = [ + nodes.Keyword('autoescape', self.parse_expression()) + ] + node.body = self.parse_statements(('name:endautoescape',), + drop_needle=True) + return nodes.Scope([node]) + + def parse_block(self): + node = nodes.Block(lineno=next(self.stream).lineno) + node.name = self.stream.expect('name').value + node.scoped = self.stream.skip_if('name:scoped') + + # common problem people encounter when switching from django + # to jinja. we do not support hyphens in block names, so let's + # raise a nicer error message in that case. + if self.stream.current.type == 'sub': + self.fail('Block names in Jinja have to be valid Python ' + 'identifiers and may not contain hyphens, use an ' + 'underscore instead.') + + node.body = self.parse_statements(('name:endblock',), drop_needle=True) + self.stream.skip_if('name:' + node.name) + return node + + def parse_extends(self): + node = nodes.Extends(lineno=next(self.stream).lineno) + node.template = self.parse_expression() + return node + + def parse_import_context(self, node, default): + if self.stream.current.test_any('name:with', 'name:without') and \ + self.stream.look().test('name:context'): + node.with_context = next(self.stream).value == 'with' + self.stream.skip() + else: + node.with_context = default + return node + + def parse_include(self): + node = nodes.Include(lineno=next(self.stream).lineno) + node.template = self.parse_expression() + if self.stream.current.test('name:ignore') and \ + self.stream.look().test('name:missing'): + node.ignore_missing = True + self.stream.skip(2) + else: + node.ignore_missing = False + return self.parse_import_context(node, True) + + def parse_import(self): + node = nodes.Import(lineno=next(self.stream).lineno) + node.template = self.parse_expression() + self.stream.expect('name:as') + node.target = self.parse_assign_target(name_only=True).name + return self.parse_import_context(node, False) + + def parse_from(self): + node = nodes.FromImport(lineno=next(self.stream).lineno) + node.template = self.parse_expression() + self.stream.expect('name:import') + node.names = [] + + def parse_context(): + if self.stream.current.value in ('with', 'without') and \ + self.stream.look().test('name:context'): + node.with_context = next(self.stream).value == 'with' + self.stream.skip() + return True + return False + + while 1: + if node.names: + self.stream.expect('comma') + if self.stream.current.type == 'name': + if parse_context(): + break + target = self.parse_assign_target(name_only=True) + if target.name.startswith('_'): + self.fail('names starting with an underline can not ' + 'be imported', target.lineno, + exc=TemplateAssertionError) + if self.stream.skip_if('name:as'): + alias = self.parse_assign_target(name_only=True) + node.names.append((target.name, alias.name)) + else: + node.names.append(target.name) + if parse_context() or self.stream.current.type != 'comma': + break + else: + self.stream.expect('name') + if not hasattr(node, 'with_context'): + node.with_context = False + return node + + def parse_signature(self, node): + node.args = args = [] + node.defaults = defaults = [] + self.stream.expect('lparen') + while self.stream.current.type != 'rparen': + if args: + self.stream.expect('comma') + arg = self.parse_assign_target(name_only=True) + arg.set_ctx('param') + if self.stream.skip_if('assign'): + defaults.append(self.parse_expression()) + elif defaults: + self.fail('non-default argument follows default argument') + args.append(arg) + self.stream.expect('rparen') + + def parse_call_block(self): + node = nodes.CallBlock(lineno=next(self.stream).lineno) + if self.stream.current.type == 'lparen': + self.parse_signature(node) + else: + node.args = [] + node.defaults = [] + + node.call = self.parse_expression() + if not isinstance(node.call, nodes.Call): + self.fail('expected call', node.lineno) + node.body = self.parse_statements(('name:endcall',), drop_needle=True) + return node + + def parse_filter_block(self): + node = nodes.FilterBlock(lineno=next(self.stream).lineno) + node.filter = self.parse_filter(None, start_inline=True) + node.body = self.parse_statements(('name:endfilter',), + drop_needle=True) + return node + + def parse_macro(self): + node = nodes.Macro(lineno=next(self.stream).lineno) + node.name = self.parse_assign_target(name_only=True).name + self.parse_signature(node) + node.body = self.parse_statements(('name:endmacro',), + drop_needle=True) + return node + + def parse_print(self): + node = nodes.Output(lineno=next(self.stream).lineno) + node.nodes = [] + while self.stream.current.type != 'block_end': + if node.nodes: + self.stream.expect('comma') + node.nodes.append(self.parse_expression()) + return node + + def parse_assign_target(self, with_tuple=True, name_only=False, + extra_end_rules=None, with_namespace=False): + """Parse an assignment target. As Jinja2 allows assignments to + tuples, this function can parse all allowed assignment targets. Per + default assignments to tuples are parsed, that can be disable however + by setting `with_tuple` to `False`. If only assignments to names are + wanted `name_only` can be set to `True`. The `extra_end_rules` + parameter is forwarded to the tuple parsing function. If + `with_namespace` is enabled, a namespace assignment may be parsed. + """ + if with_namespace and self.stream.look().type == 'dot': + token = self.stream.expect('name') + next(self.stream) # dot + attr = self.stream.expect('name') + target = nodes.NSRef(token.value, attr.value, lineno=token.lineno) + elif name_only: + token = self.stream.expect('name') + target = nodes.Name(token.value, 'store', lineno=token.lineno) + else: + if with_tuple: + target = self.parse_tuple(simplified=True, + extra_end_rules=extra_end_rules) + else: + target = self.parse_primary() + target.set_ctx('store') + if not target.can_assign(): + self.fail('can\'t assign to %r' % target.__class__. + __name__.lower(), target.lineno) + return target + + def parse_expression(self, with_condexpr=True): + """Parse an expression. Per default all expressions are parsed, if + the optional `with_condexpr` parameter is set to `False` conditional + expressions are not parsed. + """ + if with_condexpr: + return self.parse_condexpr() + return self.parse_or() + + def parse_condexpr(self): + lineno = self.stream.current.lineno + expr1 = self.parse_or() + while self.stream.skip_if('name:if'): + expr2 = self.parse_or() + if self.stream.skip_if('name:else'): + expr3 = self.parse_condexpr() + else: + expr3 = None + expr1 = nodes.CondExpr(expr2, expr1, expr3, lineno=lineno) + lineno = self.stream.current.lineno + return expr1 + + def parse_or(self): + lineno = self.stream.current.lineno + left = self.parse_and() + while self.stream.skip_if('name:or'): + right = self.parse_and() + left = nodes.Or(left, right, lineno=lineno) + lineno = self.stream.current.lineno + return left + + def parse_and(self): + lineno = self.stream.current.lineno + left = self.parse_not() + while self.stream.skip_if('name:and'): + right = self.parse_not() + left = nodes.And(left, right, lineno=lineno) + lineno = self.stream.current.lineno + return left + + def parse_not(self): + if self.stream.current.test('name:not'): + lineno = next(self.stream).lineno + return nodes.Not(self.parse_not(), lineno=lineno) + return self.parse_compare() + + def parse_compare(self): + lineno = self.stream.current.lineno + expr = self.parse_math1() + ops = [] + while 1: + token_type = self.stream.current.type + if token_type in _compare_operators: + next(self.stream) + ops.append(nodes.Operand(token_type, self.parse_math1())) + elif self.stream.skip_if('name:in'): + ops.append(nodes.Operand('in', self.parse_math1())) + elif (self.stream.current.test('name:not') and + self.stream.look().test('name:in')): + self.stream.skip(2) + ops.append(nodes.Operand('notin', self.parse_math1())) + else: + break + lineno = self.stream.current.lineno + if not ops: + return expr + return nodes.Compare(expr, ops, lineno=lineno) + + def parse_math1(self): + lineno = self.stream.current.lineno + left = self.parse_concat() + while self.stream.current.type in ('add', 'sub'): + cls = _math_nodes[self.stream.current.type] + next(self.stream) + right = self.parse_concat() + left = cls(left, right, lineno=lineno) + lineno = self.stream.current.lineno + return left + + def parse_concat(self): + lineno = self.stream.current.lineno + args = [self.parse_math2()] + while self.stream.current.type == 'tilde': + next(self.stream) + args.append(self.parse_math2()) + if len(args) == 1: + return args[0] + return nodes.Concat(args, lineno=lineno) + + def parse_math2(self): + lineno = self.stream.current.lineno + left = self.parse_pow() + while self.stream.current.type in ('mul', 'div', 'floordiv', 'mod'): + cls = _math_nodes[self.stream.current.type] + next(self.stream) + right = self.parse_pow() + left = cls(left, right, lineno=lineno) + lineno = self.stream.current.lineno + return left + + def parse_pow(self): + lineno = self.stream.current.lineno + left = self.parse_unary() + while self.stream.current.type == 'pow': + next(self.stream) + right = self.parse_unary() + left = nodes.Pow(left, right, lineno=lineno) + lineno = self.stream.current.lineno + return left + + def parse_unary(self, with_filter=True): + token_type = self.stream.current.type + lineno = self.stream.current.lineno + if token_type == 'sub': + next(self.stream) + node = nodes.Neg(self.parse_unary(False), lineno=lineno) + elif token_type == 'add': + next(self.stream) + node = nodes.Pos(self.parse_unary(False), lineno=lineno) + else: + node = self.parse_primary() + node = self.parse_postfix(node) + if with_filter: + node = self.parse_filter_expr(node) + return node + + def parse_primary(self): + token = self.stream.current + if token.type == 'name': + if token.value in ('true', 'false', 'True', 'False'): + node = nodes.Const(token.value in ('true', 'True'), + lineno=token.lineno) + elif token.value in ('none', 'None'): + node = nodes.Const(None, lineno=token.lineno) + else: + node = nodes.Name(token.value, 'load', lineno=token.lineno) + next(self.stream) + elif token.type == 'string': + next(self.stream) + buf = [token.value] + lineno = token.lineno + while self.stream.current.type == 'string': + buf.append(self.stream.current.value) + next(self.stream) + node = nodes.Const(''.join(buf), lineno=lineno) + elif token.type in ('integer', 'float'): + next(self.stream) + node = nodes.Const(token.value, lineno=token.lineno) + elif token.type == 'lparen': + next(self.stream) + node = self.parse_tuple(explicit_parentheses=True) + self.stream.expect('rparen') + elif token.type == 'lbracket': + node = self.parse_list() + elif token.type == 'lbrace': + node = self.parse_dict() + else: + self.fail("unexpected '%s'" % describe_token(token), token.lineno) + return node + + def parse_tuple(self, simplified=False, with_condexpr=True, + extra_end_rules=None, explicit_parentheses=False): + """Works like `parse_expression` but if multiple expressions are + delimited by a comma a :class:`~jinja2.nodes.Tuple` node is created. + This method could also return a regular expression instead of a tuple + if no commas where found. + + The default parsing mode is a full tuple. If `simplified` is `True` + only names and literals are parsed. The `no_condexpr` parameter is + forwarded to :meth:`parse_expression`. + + Because tuples do not require delimiters and may end in a bogus comma + an extra hint is needed that marks the end of a tuple. For example + for loops support tuples between `for` and `in`. In that case the + `extra_end_rules` is set to ``['name:in']``. + + `explicit_parentheses` is true if the parsing was triggered by an + expression in parentheses. This is used to figure out if an empty + tuple is a valid expression or not. + """ + lineno = self.stream.current.lineno + if simplified: + parse = self.parse_primary + elif with_condexpr: + parse = self.parse_expression + else: + parse = lambda: self.parse_expression(with_condexpr=False) + args = [] + is_tuple = False + while 1: + if args: + self.stream.expect('comma') + if self.is_tuple_end(extra_end_rules): + break + args.append(parse()) + if self.stream.current.type == 'comma': + is_tuple = True + else: + break + lineno = self.stream.current.lineno + + if not is_tuple: + if args: + return args[0] + + # if we don't have explicit parentheses, an empty tuple is + # not a valid expression. This would mean nothing (literally + # nothing) in the spot of an expression would be an empty + # tuple. + if not explicit_parentheses: + self.fail('Expected an expression, got \'%s\'' % + describe_token(self.stream.current)) + + return nodes.Tuple(args, 'load', lineno=lineno) + + def parse_list(self): + token = self.stream.expect('lbracket') + items = [] + while self.stream.current.type != 'rbracket': + if items: + self.stream.expect('comma') + if self.stream.current.type == 'rbracket': + break + items.append(self.parse_expression()) + self.stream.expect('rbracket') + return nodes.List(items, lineno=token.lineno) + + def parse_dict(self): + token = self.stream.expect('lbrace') + items = [] + while self.stream.current.type != 'rbrace': + if items: + self.stream.expect('comma') + if self.stream.current.type == 'rbrace': + break + key = self.parse_expression() + self.stream.expect('colon') + value = self.parse_expression() + items.append(nodes.Pair(key, value, lineno=key.lineno)) + self.stream.expect('rbrace') + return nodes.Dict(items, lineno=token.lineno) + + def parse_postfix(self, node): + while 1: + token_type = self.stream.current.type + if token_type == 'dot' or token_type == 'lbracket': + node = self.parse_subscript(node) + # calls are valid both after postfix expressions (getattr + # and getitem) as well as filters and tests + elif token_type == 'lparen': + node = self.parse_call(node) + else: + break + return node + + def parse_filter_expr(self, node): + while 1: + token_type = self.stream.current.type + if token_type == 'pipe': + node = self.parse_filter(node) + elif token_type == 'name' and self.stream.current.value == 'is': + node = self.parse_test(node) + # calls are valid both after postfix expressions (getattr + # and getitem) as well as filters and tests + elif token_type == 'lparen': + node = self.parse_call(node) + else: + break + return node + + def parse_subscript(self, node): + token = next(self.stream) + if token.type == 'dot': + attr_token = self.stream.current + next(self.stream) + if attr_token.type == 'name': + return nodes.Getattr(node, attr_token.value, 'load', + lineno=token.lineno) + elif attr_token.type != 'integer': + self.fail('expected name or number', attr_token.lineno) + arg = nodes.Const(attr_token.value, lineno=attr_token.lineno) + return nodes.Getitem(node, arg, 'load', lineno=token.lineno) + if token.type == 'lbracket': + args = [] + while self.stream.current.type != 'rbracket': + if args: + self.stream.expect('comma') + args.append(self.parse_subscribed()) + self.stream.expect('rbracket') + if len(args) == 1: + arg = args[0] + else: + arg = nodes.Tuple(args, 'load', lineno=token.lineno) + return nodes.Getitem(node, arg, 'load', lineno=token.lineno) + self.fail('expected subscript expression', self.lineno) + + def parse_subscribed(self): + lineno = self.stream.current.lineno + + if self.stream.current.type == 'colon': + next(self.stream) + args = [None] + else: + node = self.parse_expression() + if self.stream.current.type != 'colon': + return node + next(self.stream) + args = [node] + + if self.stream.current.type == 'colon': + args.append(None) + elif self.stream.current.type not in ('rbracket', 'comma'): + args.append(self.parse_expression()) + else: + args.append(None) + + if self.stream.current.type == 'colon': + next(self.stream) + if self.stream.current.type not in ('rbracket', 'comma'): + args.append(self.parse_expression()) + else: + args.append(None) + else: + args.append(None) + + return nodes.Slice(lineno=lineno, *args) + + def parse_call(self, node): + token = self.stream.expect('lparen') + args = [] + kwargs = [] + dyn_args = dyn_kwargs = None + require_comma = False + + def ensure(expr): + if not expr: + self.fail('invalid syntax for function call expression', + token.lineno) + + while self.stream.current.type != 'rparen': + if require_comma: + self.stream.expect('comma') + # support for trailing comma + if self.stream.current.type == 'rparen': + break + if self.stream.current.type == 'mul': + ensure(dyn_args is None and dyn_kwargs is None) + next(self.stream) + dyn_args = self.parse_expression() + elif self.stream.current.type == 'pow': + ensure(dyn_kwargs is None) + next(self.stream) + dyn_kwargs = self.parse_expression() + else: + ensure(dyn_args is None and dyn_kwargs is None) + if self.stream.current.type == 'name' and \ + self.stream.look().type == 'assign': + key = self.stream.current.value + self.stream.skip(2) + value = self.parse_expression() + kwargs.append(nodes.Keyword(key, value, + lineno=value.lineno)) + else: + ensure(not kwargs) + args.append(self.parse_expression()) + + require_comma = True + self.stream.expect('rparen') + + if node is None: + return args, kwargs, dyn_args, dyn_kwargs + return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs, + lineno=token.lineno) + + def parse_filter(self, node, start_inline=False): + while self.stream.current.type == 'pipe' or start_inline: + if not start_inline: + next(self.stream) + token = self.stream.expect('name') + name = token.value + while self.stream.current.type == 'dot': + next(self.stream) + name += '.' + self.stream.expect('name').value + if self.stream.current.type == 'lparen': + args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None) + else: + args = [] + kwargs = [] + dyn_args = dyn_kwargs = None + node = nodes.Filter(node, name, args, kwargs, dyn_args, + dyn_kwargs, lineno=token.lineno) + start_inline = False + return node + + def parse_test(self, node): + token = next(self.stream) + if self.stream.current.test('name:not'): + next(self.stream) + negated = True + else: + negated = False + name = self.stream.expect('name').value + while self.stream.current.type == 'dot': + next(self.stream) + name += '.' + self.stream.expect('name').value + dyn_args = dyn_kwargs = None + kwargs = [] + if self.stream.current.type == 'lparen': + args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None) + elif (self.stream.current.type in ('name', 'string', 'integer', + 'float', 'lparen', 'lbracket', + 'lbrace') and not + self.stream.current.test_any('name:else', 'name:or', + 'name:and')): + if self.stream.current.test('name:is'): + self.fail('You cannot chain multiple tests with is') + args = [self.parse_primary()] + else: + args = [] + node = nodes.Test(node, name, args, kwargs, dyn_args, + dyn_kwargs, lineno=token.lineno) + if negated: + node = nodes.Not(node, lineno=token.lineno) + return node + + def subparse(self, end_tokens=None): + body = [] + data_buffer = [] + add_data = data_buffer.append + + if end_tokens is not None: + self._end_token_stack.append(end_tokens) + + def flush_data(): + if data_buffer: + lineno = data_buffer[0].lineno + body.append(nodes.Output(data_buffer[:], lineno=lineno)) + del data_buffer[:] + + try: + while self.stream: + token = self.stream.current + if token.type == 'data': + if token.value: + add_data(nodes.TemplateData(token.value, + lineno=token.lineno)) + next(self.stream) + elif token.type == 'variable_begin': + next(self.stream) + add_data(self.parse_tuple(with_condexpr=True)) + self.stream.expect('variable_end') + elif token.type == 'block_begin': + flush_data() + next(self.stream) + if end_tokens is not None and \ + self.stream.current.test_any(*end_tokens): + return body + rv = self.parse_statement() + if isinstance(rv, list): + body.extend(rv) + else: + body.append(rv) + self.stream.expect('block_end') + else: + raise AssertionError('internal parsing error') + + flush_data() + finally: + if end_tokens is not None: + self._end_token_stack.pop() + + return body + + def parse(self): + """Parse the whole template into a `Template` node.""" + result = nodes.Template(self.subparse(), lineno=1) + result.set_environment(self.environment) + return result diff --git a/python/jinja2/runtime.py b/python/jinja2/runtime.py new file mode 100644 index 0000000..f9d7a68 --- /dev/null +++ b/python/jinja2/runtime.py @@ -0,0 +1,813 @@ +# -*- coding: utf-8 -*- +""" + jinja2.runtime + ~~~~~~~~~~~~~~ + + Runtime helpers. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD. +""" +import sys + +from itertools import chain +from types import MethodType + +from jinja2.nodes import EvalContext, _context_function_types +from jinja2.utils import Markup, soft_unicode, escape, missing, concat, \ + internalcode, object_type_repr, evalcontextfunction, Namespace +from jinja2.exceptions import UndefinedError, TemplateRuntimeError, \ + TemplateNotFound +from jinja2._compat import imap, text_type, iteritems, \ + implements_iterator, implements_to_string, string_types, PY2, \ + with_metaclass + + +# these variables are exported to the template runtime +__all__ = ['LoopContext', 'TemplateReference', 'Macro', 'Markup', + 'TemplateRuntimeError', 'missing', 'concat', 'escape', + 'markup_join', 'unicode_join', 'to_string', 'identity', + 'TemplateNotFound', 'Namespace'] + +#: the name of the function that is used to convert something into +#: a string. We can just use the text type here. +to_string = text_type + +#: the identity function. Useful for certain things in the environment +identity = lambda x: x + +_first_iteration = object() +_last_iteration = object() + + +def markup_join(seq): + """Concatenation that escapes if necessary and converts to unicode.""" + buf = [] + iterator = imap(soft_unicode, seq) + for arg in iterator: + buf.append(arg) + if hasattr(arg, '__html__'): + return Markup(u'').join(chain(buf, iterator)) + return concat(buf) + + +def unicode_join(seq): + """Simple args to unicode conversion and concatenation.""" + return concat(imap(text_type, seq)) + + +def new_context(environment, template_name, blocks, vars=None, + shared=None, globals=None, locals=None): + """Internal helper to for context creation.""" + if vars is None: + vars = {} + if shared: + parent = vars + else: + parent = dict(globals or (), **vars) + if locals: + # if the parent is shared a copy should be created because + # we don't want to modify the dict passed + if shared: + parent = dict(parent) + for key, value in iteritems(locals): + if value is not missing: + parent[key] = value + return environment.context_class(environment, parent, template_name, + blocks) + + +class TemplateReference(object): + """The `self` in templates.""" + + def __init__(self, context): + self.__context = context + + def __getitem__(self, name): + blocks = self.__context.blocks[name] + return BlockReference(name, self.__context, blocks, 0) + + def __repr__(self): + return '<%s %r>' % ( + self.__class__.__name__, + self.__context.name + ) + + +def _get_func(x): + return getattr(x, '__func__', x) + + +class ContextMeta(type): + + def __new__(cls, name, bases, d): + rv = type.__new__(cls, name, bases, d) + if bases == (): + return rv + + resolve = _get_func(rv.resolve) + default_resolve = _get_func(Context.resolve) + resolve_or_missing = _get_func(rv.resolve_or_missing) + default_resolve_or_missing = _get_func(Context.resolve_or_missing) + + # If we have a changed resolve but no changed default or missing + # resolve we invert the call logic. + if resolve is not default_resolve and \ + resolve_or_missing is default_resolve_or_missing: + rv._legacy_resolve_mode = True + elif resolve is default_resolve and \ + resolve_or_missing is default_resolve_or_missing: + rv._fast_resolve_mode = True + + return rv + + +def resolve_or_missing(context, key, missing=missing): + if key in context.vars: + return context.vars[key] + if key in context.parent: + return context.parent[key] + return missing + + +class Context(with_metaclass(ContextMeta)): + """The template context holds the variables of a template. It stores the + values passed to the template and also the names the template exports. + Creating instances is neither supported nor useful as it's created + automatically at various stages of the template evaluation and should not + be created by hand. + + The context is immutable. Modifications on :attr:`parent` **must not** + happen and modifications on :attr:`vars` are allowed from generated + template code only. Template filters and global functions marked as + :func:`contextfunction`\\s get the active context passed as first argument + and are allowed to access the context read-only. + + The template context supports read only dict operations (`get`, + `keys`, `values`, `items`, `iterkeys`, `itervalues`, `iteritems`, + `__getitem__`, `__contains__`). Additionally there is a :meth:`resolve` + method that doesn't fail with a `KeyError` but returns an + :class:`Undefined` object for missing variables. + """ + # XXX: we want to eventually make this be a deprecation warning and + # remove it. + _legacy_resolve_mode = False + _fast_resolve_mode = False + + def __init__(self, environment, parent, name, blocks): + self.parent = parent + self.vars = {} + self.environment = environment + self.eval_ctx = EvalContext(self.environment, name) + self.exported_vars = set() + self.name = name + + # create the initial mapping of blocks. Whenever template inheritance + # takes place the runtime will update this mapping with the new blocks + # from the template. + self.blocks = dict((k, [v]) for k, v in iteritems(blocks)) + + # In case we detect the fast resolve mode we can set up an alias + # here that bypasses the legacy code logic. + if self._fast_resolve_mode: + self.resolve_or_missing = MethodType(resolve_or_missing, self) + + def super(self, name, current): + """Render a parent block.""" + try: + blocks = self.blocks[name] + index = blocks.index(current) + 1 + blocks[index] + except LookupError: + return self.environment.undefined('there is no parent block ' + 'called %r.' % name, + name='super') + return BlockReference(name, self, blocks, index) + + def get(self, key, default=None): + """Returns an item from the template context, if it doesn't exist + `default` is returned. + """ + try: + return self[key] + except KeyError: + return default + + def resolve(self, key): + """Looks up a variable like `__getitem__` or `get` but returns an + :class:`Undefined` object with the name of the name looked up. + """ + if self._legacy_resolve_mode: + rv = resolve_or_missing(self, key) + else: + rv = self.resolve_or_missing(key) + if rv is missing: + return self.environment.undefined(name=key) + return rv + + def resolve_or_missing(self, key): + """Resolves a variable like :meth:`resolve` but returns the + special `missing` value if it cannot be found. + """ + if self._legacy_resolve_mode: + rv = self.resolve(key) + if isinstance(rv, Undefined): + rv = missing + return rv + return resolve_or_missing(self, key) + + def get_exported(self): + """Get a new dict with the exported variables.""" + return dict((k, self.vars[k]) for k in self.exported_vars) + + def get_all(self): + """Return the complete context as dict including the exported + variables. For optimizations reasons this might not return an + actual copy so be careful with using it. + """ + if not self.vars: + return self.parent + if not self.parent: + return self.vars + return dict(self.parent, **self.vars) + + @internalcode + def call(__self, __obj, *args, **kwargs): + """Call the callable with the arguments and keyword arguments + provided but inject the active context or environment as first + argument if the callable is a :func:`contextfunction` or + :func:`environmentfunction`. + """ + if __debug__: + __traceback_hide__ = True # noqa + + # Allow callable classes to take a context + if hasattr(__obj, '__call__'): + fn = __obj.__call__ + for fn_type in ('contextfunction', + 'evalcontextfunction', + 'environmentfunction'): + if hasattr(fn, fn_type): + __obj = fn + break + + if isinstance(__obj, _context_function_types): + if getattr(__obj, 'contextfunction', 0): + args = (__self,) + args + elif getattr(__obj, 'evalcontextfunction', 0): + args = (__self.eval_ctx,) + args + elif getattr(__obj, 'environmentfunction', 0): + args = (__self.environment,) + args + try: + return __obj(*args, **kwargs) + except StopIteration: + return __self.environment.undefined('value was undefined because ' + 'a callable raised a ' + 'StopIteration exception') + + def derived(self, locals=None): + """Internal helper function to create a derived context. This is + used in situations where the system needs a new context in the same + template that is independent. + """ + context = new_context(self.environment, self.name, {}, + self.get_all(), True, None, locals) + context.eval_ctx = self.eval_ctx + context.blocks.update((k, list(v)) for k, v in iteritems(self.blocks)) + return context + + def _all(meth): + proxy = lambda self: getattr(self.get_all(), meth)() + proxy.__doc__ = getattr(dict, meth).__doc__ + proxy.__name__ = meth + return proxy + + keys = _all('keys') + values = _all('values') + items = _all('items') + + # not available on python 3 + if PY2: + iterkeys = _all('iterkeys') + itervalues = _all('itervalues') + iteritems = _all('iteritems') + del _all + + def __contains__(self, name): + return name in self.vars or name in self.parent + + def __getitem__(self, key): + """Lookup a variable or raise `KeyError` if the variable is + undefined. + """ + item = self.resolve_or_missing(key) + if item is missing: + raise KeyError(key) + return item + + def __repr__(self): + return '<%s %s of %r>' % ( + self.__class__.__name__, + repr(self.get_all()), + self.name + ) + + +# register the context as mapping if possible +try: + from collections import Mapping + Mapping.register(Context) +except ImportError: + pass + + +class BlockReference(object): + """One block on a template reference.""" + + def __init__(self, name, context, stack, depth): + self.name = name + self._context = context + self._stack = stack + self._depth = depth + + @property + def super(self): + """Super the block.""" + if self._depth + 1 >= len(self._stack): + return self._context.environment. \ + undefined('there is no parent block called %r.' % + self.name, name='super') + return BlockReference(self.name, self._context, self._stack, + self._depth + 1) + + @internalcode + def __call__(self): + rv = concat(self._stack[self._depth](self._context)) + if self._context.eval_ctx.autoescape: + rv = Markup(rv) + return rv + + +class LoopContextBase(object): + """A loop context for dynamic iteration.""" + + _before = _first_iteration + _current = _first_iteration + _after = _last_iteration + _length = None + + def __init__(self, undefined, recurse=None, depth0=0): + self._undefined = undefined + self._recurse = recurse + self.index0 = -1 + self.depth0 = depth0 + self._last_checked_value = missing + + def cycle(self, *args): + """Cycles among the arguments with the current loop index.""" + if not args: + raise TypeError('no items for cycling given') + return args[self.index0 % len(args)] + + def changed(self, *value): + """Checks whether the value has changed since the last call.""" + if self._last_checked_value != value: + self._last_checked_value = value + return True + return False + + first = property(lambda x: x.index0 == 0) + last = property(lambda x: x._after is _last_iteration) + index = property(lambda x: x.index0 + 1) + revindex = property(lambda x: x.length - x.index0) + revindex0 = property(lambda x: x.length - x.index) + depth = property(lambda x: x.depth0 + 1) + + @property + def previtem(self): + if self._before is _first_iteration: + return self._undefined('there is no previous item') + return self._before + + @property + def nextitem(self): + if self._after is _last_iteration: + return self._undefined('there is no next item') + return self._after + + def __len__(self): + return self.length + + @internalcode + def loop(self, iterable): + if self._recurse is None: + raise TypeError('Tried to call non recursive loop. Maybe you ' + "forgot the 'recursive' modifier.") + return self._recurse(iterable, self._recurse, self.depth0 + 1) + + # a nifty trick to enhance the error message if someone tried to call + # the the loop without or with too many arguments. + __call__ = loop + del loop + + def __repr__(self): + return '<%s %r/%r>' % ( + self.__class__.__name__, + self.index, + self.length + ) + + +class LoopContext(LoopContextBase): + + def __init__(self, iterable, undefined, recurse=None, depth0=0): + LoopContextBase.__init__(self, undefined, recurse, depth0) + self._iterator = iter(iterable) + + # try to get the length of the iterable early. This must be done + # here because there are some broken iterators around where there + # __len__ is the number of iterations left (i'm looking at your + # listreverseiterator!). + try: + self._length = len(iterable) + except (TypeError, AttributeError): + self._length = None + self._after = self._safe_next() + + @property + def length(self): + if self._length is None: + # if was not possible to get the length of the iterator when + # the loop context was created (ie: iterating over a generator) + # we have to convert the iterable into a sequence and use the + # length of that + the number of iterations so far. + iterable = tuple(self._iterator) + self._iterator = iter(iterable) + iterations_done = self.index0 + 2 + self._length = len(iterable) + iterations_done + return self._length + + def __iter__(self): + return LoopContextIterator(self) + + def _safe_next(self): + try: + return next(self._iterator) + except StopIteration: + return _last_iteration + + +@implements_iterator +class LoopContextIterator(object): + """The iterator for a loop context.""" + __slots__ = ('context',) + + def __init__(self, context): + self.context = context + + def __iter__(self): + return self + + def __next__(self): + ctx = self.context + ctx.index0 += 1 + if ctx._after is _last_iteration: + raise StopIteration() + ctx._before = ctx._current + ctx._current = ctx._after + ctx._after = ctx._safe_next() + return ctx._current, ctx + + +class Macro(object): + """Wraps a macro function.""" + + def __init__(self, environment, func, name, arguments, + catch_kwargs, catch_varargs, caller, + default_autoescape=None): + self._environment = environment + self._func = func + self._argument_count = len(arguments) + self.name = name + self.arguments = arguments + self.catch_kwargs = catch_kwargs + self.catch_varargs = catch_varargs + self.caller = caller + self.explicit_caller = 'caller' in arguments + if default_autoescape is None: + default_autoescape = environment.autoescape + self._default_autoescape = default_autoescape + + @internalcode + @evalcontextfunction + def __call__(self, *args, **kwargs): + # This requires a bit of explanation, In the past we used to + # decide largely based on compile-time information if a macro is + # safe or unsafe. While there was a volatile mode it was largely + # unused for deciding on escaping. This turns out to be + # problemtic for macros because if a macro is safe or not not so + # much depends on the escape mode when it was defined but when it + # was used. + # + # Because however we export macros from the module system and + # there are historic callers that do not pass an eval context (and + # will continue to not pass one), we need to perform an instance + # check here. + # + # This is considered safe because an eval context is not a valid + # argument to callables otherwise anwyays. Worst case here is + # that if no eval context is passed we fall back to the compile + # time autoescape flag. + if args and isinstance(args[0], EvalContext): + autoescape = args[0].autoescape + args = args[1:] + else: + autoescape = self._default_autoescape + + # try to consume the positional arguments + arguments = list(args[:self._argument_count]) + off = len(arguments) + + # For information why this is necessary refer to the handling + # of caller in the `macro_body` handler in the compiler. + found_caller = False + + # if the number of arguments consumed is not the number of + # arguments expected we start filling in keyword arguments + # and defaults. + if off != self._argument_count: + for idx, name in enumerate(self.arguments[len(arguments):]): + try: + value = kwargs.pop(name) + except KeyError: + value = missing + if name == 'caller': + found_caller = True + arguments.append(value) + else: + found_caller = self.explicit_caller + + # it's important that the order of these arguments does not change + # if not also changed in the compiler's `function_scoping` method. + # the order is caller, keyword arguments, positional arguments! + if self.caller and not found_caller: + caller = kwargs.pop('caller', None) + if caller is None: + caller = self._environment.undefined('No caller defined', + name='caller') + arguments.append(caller) + + if self.catch_kwargs: + arguments.append(kwargs) + elif kwargs: + if 'caller' in kwargs: + raise TypeError('macro %r was invoked with two values for ' + 'the special caller argument. This is ' + 'most likely a bug.' % self.name) + raise TypeError('macro %r takes no keyword argument %r' % + (self.name, next(iter(kwargs)))) + if self.catch_varargs: + arguments.append(args[self._argument_count:]) + elif len(args) > self._argument_count: + raise TypeError('macro %r takes not more than %d argument(s)' % + (self.name, len(self.arguments))) + + return self._invoke(arguments, autoescape) + + def _invoke(self, arguments, autoescape): + """This method is being swapped out by the async implementation.""" + rv = self._func(*arguments) + if autoescape: + rv = Markup(rv) + return rv + + def __repr__(self): + return '<%s %s>' % ( + self.__class__.__name__, + self.name is None and 'anonymous' or repr(self.name) + ) + + +@implements_to_string +class Undefined(object): + """The default undefined type. This undefined type can be printed and + iterated over, but every other access will raise an :exc:`jinja2.exceptions.UndefinedError`: + + >>> foo = Undefined(name='foo') + >>> str(foo) + '' + >>> not foo + True + >>> foo + 42 + Traceback (most recent call last): + ... + jinja2.exceptions.UndefinedError: 'foo' is undefined + """ + __slots__ = ('_undefined_hint', '_undefined_obj', '_undefined_name', + '_undefined_exception') + + def __init__(self, hint=None, obj=missing, name=None, exc=UndefinedError): + self._undefined_hint = hint + self._undefined_obj = obj + self._undefined_name = name + self._undefined_exception = exc + + @internalcode + def _fail_with_undefined_error(self, *args, **kwargs): + """Regular callback function for undefined objects that raises an + `jinja2.exceptions.UndefinedError` on call. + """ + if self._undefined_hint is None: + if self._undefined_obj is missing: + hint = '%r is undefined' % self._undefined_name + elif not isinstance(self._undefined_name, string_types): + hint = '%s has no element %r' % ( + object_type_repr(self._undefined_obj), + self._undefined_name + ) + else: + hint = '%r has no attribute %r' % ( + object_type_repr(self._undefined_obj), + self._undefined_name + ) + else: + hint = self._undefined_hint + raise self._undefined_exception(hint) + + @internalcode + def __getattr__(self, name): + if name[:2] == '__': + raise AttributeError(name) + return self._fail_with_undefined_error() + + __add__ = __radd__ = __mul__ = __rmul__ = __div__ = __rdiv__ = \ + __truediv__ = __rtruediv__ = __floordiv__ = __rfloordiv__ = \ + __mod__ = __rmod__ = __pos__ = __neg__ = __call__ = \ + __getitem__ = __lt__ = __le__ = __gt__ = __ge__ = __int__ = \ + __float__ = __complex__ = __pow__ = __rpow__ = __sub__ = \ + __rsub__ = _fail_with_undefined_error + + def __eq__(self, other): + return type(self) is type(other) + + def __ne__(self, other): + return not self.__eq__(other) + + def __hash__(self): + return id(type(self)) + + def __str__(self): + return u'' + + def __len__(self): + return 0 + + def __iter__(self): + if 0: + yield None + + def __nonzero__(self): + return False + __bool__ = __nonzero__ + + def __repr__(self): + return 'Undefined' + + +def make_logging_undefined(logger=None, base=None): + """Given a logger object this returns a new undefined class that will + log certain failures. It will log iterations and printing. If no + logger is given a default logger is created. + + Example:: + + logger = logging.getLogger(__name__) + LoggingUndefined = make_logging_undefined( + logger=logger, + base=Undefined + ) + + .. versionadded:: 2.8 + + :param logger: the logger to use. If not provided, a default logger + is created. + :param base: the base class to add logging functionality to. This + defaults to :class:`Undefined`. + """ + if logger is None: + import logging + logger = logging.getLogger(__name__) + logger.addHandler(logging.StreamHandler(sys.stderr)) + if base is None: + base = Undefined + + def _log_message(undef): + if undef._undefined_hint is None: + if undef._undefined_obj is missing: + hint = '%s is undefined' % undef._undefined_name + elif not isinstance(undef._undefined_name, string_types): + hint = '%s has no element %s' % ( + object_type_repr(undef._undefined_obj), + undef._undefined_name) + else: + hint = '%s has no attribute %s' % ( + object_type_repr(undef._undefined_obj), + undef._undefined_name) + else: + hint = undef._undefined_hint + logger.warning('Template variable warning: %s', hint) + + class LoggingUndefined(base): + + def _fail_with_undefined_error(self, *args, **kwargs): + try: + return base._fail_with_undefined_error(self, *args, **kwargs) + except self._undefined_exception as e: + logger.error('Template variable error: %s', str(e)) + raise e + + def __str__(self): + rv = base.__str__(self) + _log_message(self) + return rv + + def __iter__(self): + rv = base.__iter__(self) + _log_message(self) + return rv + + if PY2: + def __nonzero__(self): + rv = base.__nonzero__(self) + _log_message(self) + return rv + + def __unicode__(self): + rv = base.__unicode__(self) + _log_message(self) + return rv + else: + def __bool__(self): + rv = base.__bool__(self) + _log_message(self) + return rv + + return LoggingUndefined + + +@implements_to_string +class DebugUndefined(Undefined): + """An undefined that returns the debug info when printed. + + >>> foo = DebugUndefined(name='foo') + >>> str(foo) + '{{ foo }}' + >>> not foo + True + >>> foo + 42 + Traceback (most recent call last): + ... + jinja2.exceptions.UndefinedError: 'foo' is undefined + """ + __slots__ = () + + def __str__(self): + if self._undefined_hint is None: + if self._undefined_obj is missing: + return u'{{ %s }}' % self._undefined_name + return '{{ no such element: %s[%r] }}' % ( + object_type_repr(self._undefined_obj), + self._undefined_name + ) + return u'{{ undefined value printed: %s }}' % self._undefined_hint + + +@implements_to_string +class StrictUndefined(Undefined): + """An undefined that barks on print and iteration as well as boolean + tests and all kinds of comparisons. In other words: you can do nothing + with it except checking if it's defined using the `defined` test. + + >>> foo = StrictUndefined(name='foo') + >>> str(foo) + Traceback (most recent call last): + ... + jinja2.exceptions.UndefinedError: 'foo' is undefined + >>> not foo + Traceback (most recent call last): + ... + jinja2.exceptions.UndefinedError: 'foo' is undefined + >>> foo + 42 + Traceback (most recent call last): + ... + jinja2.exceptions.UndefinedError: 'foo' is undefined + """ + __slots__ = () + __iter__ = __str__ = __len__ = __nonzero__ = __eq__ = \ + __ne__ = __bool__ = __hash__ = \ + Undefined._fail_with_undefined_error + + +# remove remaining slots attributes, after the metaclass did the magic they +# are unneeded and irritating as they contain wrong data for the subclasses. +del Undefined.__slots__, DebugUndefined.__slots__, StrictUndefined.__slots__ diff --git a/python/jinja2/sandbox.py b/python/jinja2/sandbox.py new file mode 100644 index 0000000..752e812 --- /dev/null +++ b/python/jinja2/sandbox.py @@ -0,0 +1,486 @@ +# -*- coding: utf-8 -*- +""" + jinja2.sandbox + ~~~~~~~~~~~~~~ + + Adds a sandbox layer to Jinja as it was the default behavior in the old + Jinja 1 releases. This sandbox is slightly different from Jinja 1 as the + default behavior is easier to use. + + The behavior can be changed by subclassing the environment. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD. +""" +import types +import operator +from collections import Mapping +from jinja2.environment import Environment +from jinja2.exceptions import SecurityError +from jinja2._compat import string_types, PY2 +from jinja2.utils import Markup + +from markupsafe import EscapeFormatter +from string import Formatter + + +#: maximum number of items a range may produce +MAX_RANGE = 100000 + +#: attributes of function objects that are considered unsafe. +if PY2: + UNSAFE_FUNCTION_ATTRIBUTES = set(['func_closure', 'func_code', 'func_dict', + 'func_defaults', 'func_globals']) +else: + # On versions > python 2 the special attributes on functions are gone, + # but they remain on methods and generators for whatever reason. + UNSAFE_FUNCTION_ATTRIBUTES = set() + + +#: unsafe method attributes. function attributes are unsafe for methods too +UNSAFE_METHOD_ATTRIBUTES = set(['im_class', 'im_func', 'im_self']) + +#: unsafe generator attirbutes. +UNSAFE_GENERATOR_ATTRIBUTES = set(['gi_frame', 'gi_code']) + +#: unsafe attributes on coroutines +UNSAFE_COROUTINE_ATTRIBUTES = set(['cr_frame', 'cr_code']) + +#: unsafe attributes on async generators +UNSAFE_ASYNC_GENERATOR_ATTRIBUTES = set(['ag_code', 'ag_frame']) + +import warnings + +# make sure we don't warn in python 2.6 about stuff we don't care about +warnings.filterwarnings('ignore', 'the sets module', DeprecationWarning, + module='jinja2.sandbox') + +from collections import deque + +_mutable_set_types = (set,) +_mutable_mapping_types = (dict,) +_mutable_sequence_types = (list,) + + +# on python 2.x we can register the user collection types +try: + from UserDict import UserDict, DictMixin + from UserList import UserList + _mutable_mapping_types += (UserDict, DictMixin) + _mutable_set_types += (UserList,) +except ImportError: + pass + +# if sets is still available, register the mutable set from there as well +try: + from sets import Set + _mutable_set_types += (Set,) +except ImportError: + pass + +#: register Python 2.6 abstract base classes +from collections import MutableSet, MutableMapping, MutableSequence +_mutable_set_types += (MutableSet,) +_mutable_mapping_types += (MutableMapping,) +_mutable_sequence_types += (MutableSequence,) + + +_mutable_spec = ( + (_mutable_set_types, frozenset([ + 'add', 'clear', 'difference_update', 'discard', 'pop', 'remove', + 'symmetric_difference_update', 'update' + ])), + (_mutable_mapping_types, frozenset([ + 'clear', 'pop', 'popitem', 'setdefault', 'update' + ])), + (_mutable_sequence_types, frozenset([ + 'append', 'reverse', 'insert', 'sort', 'extend', 'remove' + ])), + (deque, frozenset([ + 'append', 'appendleft', 'clear', 'extend', 'extendleft', 'pop', + 'popleft', 'remove', 'rotate' + ])) +) + + +class _MagicFormatMapping(Mapping): + """This class implements a dummy wrapper to fix a bug in the Python + standard library for string formatting. + + See https://bugs.python.org/issue13598 for information about why + this is necessary. + """ + + def __init__(self, args, kwargs): + self._args = args + self._kwargs = kwargs + self._last_index = 0 + + def __getitem__(self, key): + if key == '': + idx = self._last_index + self._last_index += 1 + try: + return self._args[idx] + except LookupError: + pass + key = str(idx) + return self._kwargs[key] + + def __iter__(self): + return iter(self._kwargs) + + def __len__(self): + return len(self._kwargs) + + +def inspect_format_method(callable): + if not isinstance(callable, (types.MethodType, + types.BuiltinMethodType)) or \ + callable.__name__ not in ('format', 'format_map'): + return None + obj = callable.__self__ + if isinstance(obj, string_types): + return obj + + +def safe_range(*args): + """A range that can't generate ranges with a length of more than + MAX_RANGE items. + """ + rng = range(*args) + if len(rng) > MAX_RANGE: + raise OverflowError('range too big, maximum size for range is %d' % + MAX_RANGE) + return rng + + +def unsafe(f): + """Marks a function or method as unsafe. + + :: + + @unsafe + def delete(self): + pass + """ + f.unsafe_callable = True + return f + + +def is_internal_attribute(obj, attr): + """Test if the attribute given is an internal python attribute. For + example this function returns `True` for the `func_code` attribute of + python objects. This is useful if the environment method + :meth:`~SandboxedEnvironment.is_safe_attribute` is overridden. + + >>> from jinja2.sandbox import is_internal_attribute + >>> is_internal_attribute(str, "mro") + True + >>> is_internal_attribute(str, "upper") + False + """ + if isinstance(obj, types.FunctionType): + if attr in UNSAFE_FUNCTION_ATTRIBUTES: + return True + elif isinstance(obj, types.MethodType): + if attr in UNSAFE_FUNCTION_ATTRIBUTES or \ + attr in UNSAFE_METHOD_ATTRIBUTES: + return True + elif isinstance(obj, type): + if attr == 'mro': + return True + elif isinstance(obj, (types.CodeType, types.TracebackType, types.FrameType)): + return True + elif isinstance(obj, types.GeneratorType): + if attr in UNSAFE_GENERATOR_ATTRIBUTES: + return True + elif hasattr(types, 'CoroutineType') and isinstance(obj, types.CoroutineType): + if attr in UNSAFE_COROUTINE_ATTRIBUTES: + return True + elif hasattr(types, 'AsyncGeneratorType') and isinstance(obj, types.AsyncGeneratorType): + if attr in UNSAFE_ASYNC_GENERATOR_ATTRIBUTES: + return True + return attr.startswith('__') + + +def modifies_known_mutable(obj, attr): + """This function checks if an attribute on a builtin mutable object + (list, dict, set or deque) would modify it if called. It also supports + the "user"-versions of the objects (`sets.Set`, `UserDict.*` etc.) and + with Python 2.6 onwards the abstract base classes `MutableSet`, + `MutableMapping`, and `MutableSequence`. + + >>> modifies_known_mutable({}, "clear") + True + >>> modifies_known_mutable({}, "keys") + False + >>> modifies_known_mutable([], "append") + True + >>> modifies_known_mutable([], "index") + False + + If called with an unsupported object (such as unicode) `False` is + returned. + + >>> modifies_known_mutable("foo", "upper") + False + """ + for typespec, unsafe in _mutable_spec: + if isinstance(obj, typespec): + return attr in unsafe + return False + + +class SandboxedEnvironment(Environment): + """The sandboxed environment. It works like the regular environment but + tells the compiler to generate sandboxed code. Additionally subclasses of + this environment may override the methods that tell the runtime what + attributes or functions are safe to access. + + If the template tries to access insecure code a :exc:`SecurityError` is + raised. However also other exceptions may occur during the rendering so + the caller has to ensure that all exceptions are caught. + """ + sandboxed = True + + #: default callback table for the binary operators. A copy of this is + #: available on each instance of a sandboxed environment as + #: :attr:`binop_table` + default_binop_table = { + '+': operator.add, + '-': operator.sub, + '*': operator.mul, + '/': operator.truediv, + '//': operator.floordiv, + '**': operator.pow, + '%': operator.mod + } + + #: default callback table for the unary operators. A copy of this is + #: available on each instance of a sandboxed environment as + #: :attr:`unop_table` + default_unop_table = { + '+': operator.pos, + '-': operator.neg + } + + #: a set of binary operators that should be intercepted. Each operator + #: that is added to this set (empty by default) is delegated to the + #: :meth:`call_binop` method that will perform the operator. The default + #: operator callback is specified by :attr:`binop_table`. + #: + #: The following binary operators are interceptable: + #: ``//``, ``%``, ``+``, ``*``, ``-``, ``/``, and ``**`` + #: + #: The default operation form the operator table corresponds to the + #: builtin function. Intercepted calls are always slower than the native + #: operator call, so make sure only to intercept the ones you are + #: interested in. + #: + #: .. versionadded:: 2.6 + intercepted_binops = frozenset() + + #: a set of unary operators that should be intercepted. Each operator + #: that is added to this set (empty by default) is delegated to the + #: :meth:`call_unop` method that will perform the operator. The default + #: operator callback is specified by :attr:`unop_table`. + #: + #: The following unary operators are interceptable: ``+``, ``-`` + #: + #: The default operation form the operator table corresponds to the + #: builtin function. Intercepted calls are always slower than the native + #: operator call, so make sure only to intercept the ones you are + #: interested in. + #: + #: .. versionadded:: 2.6 + intercepted_unops = frozenset() + + def intercept_unop(self, operator): + """Called during template compilation with the name of a unary + operator to check if it should be intercepted at runtime. If this + method returns `True`, :meth:`call_unop` is excuted for this unary + operator. The default implementation of :meth:`call_unop` will use + the :attr:`unop_table` dictionary to perform the operator with the + same logic as the builtin one. + + The following unary operators are interceptable: ``+`` and ``-`` + + Intercepted calls are always slower than the native operator call, + so make sure only to intercept the ones you are interested in. + + .. versionadded:: 2.6 + """ + return False + + + def __init__(self, *args, **kwargs): + Environment.__init__(self, *args, **kwargs) + self.globals['range'] = safe_range + self.binop_table = self.default_binop_table.copy() + self.unop_table = self.default_unop_table.copy() + + def is_safe_attribute(self, obj, attr, value): + """The sandboxed environment will call this method to check if the + attribute of an object is safe to access. Per default all attributes + starting with an underscore are considered private as well as the + special attributes of internal python objects as returned by the + :func:`is_internal_attribute` function. + """ + return not (attr.startswith('_') or is_internal_attribute(obj, attr)) + + def is_safe_callable(self, obj): + """Check if an object is safely callable. Per default a function is + considered safe unless the `unsafe_callable` attribute exists and is + True. Override this method to alter the behavior, but this won't + affect the `unsafe` decorator from this module. + """ + return not (getattr(obj, 'unsafe_callable', False) or + getattr(obj, 'alters_data', False)) + + def call_binop(self, context, operator, left, right): + """For intercepted binary operator calls (:meth:`intercepted_binops`) + this function is executed instead of the builtin operator. This can + be used to fine tune the behavior of certain operators. + + .. versionadded:: 2.6 + """ + return self.binop_table[operator](left, right) + + def call_unop(self, context, operator, arg): + """For intercepted unary operator calls (:meth:`intercepted_unops`) + this function is executed instead of the builtin operator. This can + be used to fine tune the behavior of certain operators. + + .. versionadded:: 2.6 + """ + return self.unop_table[operator](arg) + + def getitem(self, obj, argument): + """Subscribe an object from sandboxed code.""" + try: + return obj[argument] + except (TypeError, LookupError): + if isinstance(argument, string_types): + try: + attr = str(argument) + except Exception: + pass + else: + try: + value = getattr(obj, attr) + except AttributeError: + pass + else: + if self.is_safe_attribute(obj, argument, value): + return value + return self.unsafe_undefined(obj, argument) + return self.undefined(obj=obj, name=argument) + + def getattr(self, obj, attribute): + """Subscribe an object from sandboxed code and prefer the + attribute. The attribute passed *must* be a bytestring. + """ + try: + value = getattr(obj, attribute) + except AttributeError: + try: + return obj[attribute] + except (TypeError, LookupError): + pass + else: + if self.is_safe_attribute(obj, attribute, value): + return value + return self.unsafe_undefined(obj, attribute) + return self.undefined(obj=obj, name=attribute) + + def unsafe_undefined(self, obj, attribute): + """Return an undefined object for unsafe attributes.""" + return self.undefined('access to attribute %r of %r ' + 'object is unsafe.' % ( + attribute, + obj.__class__.__name__ + ), name=attribute, obj=obj, exc=SecurityError) + + def format_string(self, s, args, kwargs, format_func=None): + """If a format call is detected, then this is routed through this + method so that our safety sandbox can be used for it. + """ + if isinstance(s, Markup): + formatter = SandboxedEscapeFormatter(self, s.escape) + else: + formatter = SandboxedFormatter(self) + + if format_func is not None and format_func.__name__ == 'format_map': + if len(args) != 1 or kwargs: + raise TypeError( + 'format_map() takes exactly one argument %d given' + % (len(args) + (kwargs is not None)) + ) + + kwargs = args[0] + args = None + + kwargs = _MagicFormatMapping(args, kwargs) + rv = formatter.vformat(s, args, kwargs) + return type(s)(rv) + + def call(__self, __context, __obj, *args, **kwargs): + """Call an object from sandboxed code.""" + fmt = inspect_format_method(__obj) + if fmt is not None: + return __self.format_string(fmt, args, kwargs, __obj) + + # the double prefixes are to avoid double keyword argument + # errors when proxying the call. + if not __self.is_safe_callable(__obj): + raise SecurityError('%r is not safely callable' % (__obj,)) + return __context.call(__obj, *args, **kwargs) + + +class ImmutableSandboxedEnvironment(SandboxedEnvironment): + """Works exactly like the regular `SandboxedEnvironment` but does not + permit modifications on the builtin mutable objects `list`, `set`, and + `dict` by using the :func:`modifies_known_mutable` function. + """ + + def is_safe_attribute(self, obj, attr, value): + if not SandboxedEnvironment.is_safe_attribute(self, obj, attr, value): + return False + return not modifies_known_mutable(obj, attr) + + +# This really is not a public API apparenlty. +try: + from _string import formatter_field_name_split +except ImportError: + def formatter_field_name_split(field_name): + return field_name._formatter_field_name_split() + + +class SandboxedFormatterMixin(object): + + def __init__(self, env): + self._env = env + + def get_field(self, field_name, args, kwargs): + first, rest = formatter_field_name_split(field_name) + obj = self.get_value(first, args, kwargs) + for is_attr, i in rest: + if is_attr: + obj = self._env.getattr(obj, i) + else: + obj = self._env.getitem(obj, i) + return obj, first + +class SandboxedFormatter(SandboxedFormatterMixin, Formatter): + + def __init__(self, env): + SandboxedFormatterMixin.__init__(self, env) + Formatter.__init__(self) + +class SandboxedEscapeFormatter(SandboxedFormatterMixin, EscapeFormatter): + + def __init__(self, env, escape): + SandboxedFormatterMixin.__init__(self, env) + EscapeFormatter.__init__(self, escape) diff --git a/python/jinja2/tests.py b/python/jinja2/tests.py new file mode 100644 index 0000000..0adc3d4 --- /dev/null +++ b/python/jinja2/tests.py @@ -0,0 +1,175 @@ +# -*- coding: utf-8 -*- +""" + jinja2.tests + ~~~~~~~~~~~~ + + Jinja test functions. Used with the "is" operator. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import operator +import re +from collections import Mapping +from jinja2.runtime import Undefined +from jinja2._compat import text_type, string_types, integer_types +import decimal + +number_re = re.compile(r'^-?\d+(\.\d+)?$') +regex_type = type(number_re) + + +test_callable = callable + + +def test_odd(value): + """Return true if the variable is odd.""" + return value % 2 == 1 + + +def test_even(value): + """Return true if the variable is even.""" + return value % 2 == 0 + + +def test_divisibleby(value, num): + """Check if a variable is divisible by a number.""" + return value % num == 0 + + +def test_defined(value): + """Return true if the variable is defined: + + .. sourcecode:: jinja + + {% if variable is defined %} + value of variable: {{ variable }} + {% else %} + variable is not defined + {% endif %} + + See the :func:`default` filter for a simple way to set undefined + variables. + """ + return not isinstance(value, Undefined) + + +def test_undefined(value): + """Like :func:`defined` but the other way round.""" + return isinstance(value, Undefined) + + +def test_none(value): + """Return true if the variable is none.""" + return value is None + + +def test_lower(value): + """Return true if the variable is lowercased.""" + return text_type(value).islower() + + +def test_upper(value): + """Return true if the variable is uppercased.""" + return text_type(value).isupper() + + +def test_string(value): + """Return true if the object is a string.""" + return isinstance(value, string_types) + + +def test_mapping(value): + """Return true if the object is a mapping (dict etc.). + + .. versionadded:: 2.6 + """ + return isinstance(value, Mapping) + + +def test_number(value): + """Return true if the variable is a number.""" + return isinstance(value, integer_types + (float, complex, decimal.Decimal)) + + +def test_sequence(value): + """Return true if the variable is a sequence. Sequences are variables + that are iterable. + """ + try: + len(value) + value.__getitem__ + except: + return False + return True + + +def test_sameas(value, other): + """Check if an object points to the same memory address than another + object: + + .. sourcecode:: jinja + + {% if foo.attribute is sameas false %} + the foo attribute really is the `False` singleton + {% endif %} + """ + return value is other + + +def test_iterable(value): + """Check if it's possible to iterate over an object.""" + try: + iter(value) + except TypeError: + return False + return True + + +def test_escaped(value): + """Check if the value is escaped.""" + return hasattr(value, '__html__') + + +def test_in(value, seq): + """Check if value is in seq. + + .. versionadded:: 2.10 + """ + return value in seq + + +TESTS = { + 'odd': test_odd, + 'even': test_even, + 'divisibleby': test_divisibleby, + 'defined': test_defined, + 'undefined': test_undefined, + 'none': test_none, + 'lower': test_lower, + 'upper': test_upper, + 'string': test_string, + 'mapping': test_mapping, + 'number': test_number, + 'sequence': test_sequence, + 'iterable': test_iterable, + 'callable': test_callable, + 'sameas': test_sameas, + 'escaped': test_escaped, + 'in': test_in, + '==': operator.eq, + 'eq': operator.eq, + 'equalto': operator.eq, + '!=': operator.ne, + 'ne': operator.ne, + '>': operator.gt, + 'gt': operator.gt, + 'greaterthan': operator.gt, + 'ge': operator.ge, + '>=': operator.ge, + '<': operator.lt, + 'lt': operator.lt, + 'lessthan': operator.lt, + '<=': operator.le, + 'le': operator.le, +} diff --git a/python/jinja2/utils.py b/python/jinja2/utils.py new file mode 100644 index 0000000..502a311 --- /dev/null +++ b/python/jinja2/utils.py @@ -0,0 +1,647 @@ +# -*- coding: utf-8 -*- +""" + jinja2.utils + ~~~~~~~~~~~~ + + Utility functions. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD, see LICENSE for more details. +""" +import re +import json +import errno +from collections import deque +from threading import Lock +from jinja2._compat import text_type, string_types, implements_iterator, \ + url_quote + + +_word_split_re = re.compile(r'(\s+)') +_punctuation_re = re.compile( + '^(?P<lead>(?:%s)*)(?P<middle>.*?)(?P<trail>(?:%s)*)$' % ( + '|'.join(map(re.escape, ('(', '<', '<'))), + '|'.join(map(re.escape, ('.', ',', ')', '>', '\n', '>'))) + ) +) +_simple_email_re = re.compile(r'^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$') +_striptags_re = re.compile(r'(<!--.*?-->|<[^>]*>)') +_entity_re = re.compile(r'&([^;]+);') +_letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' +_digits = '0123456789' + +# special singleton representing missing values for the runtime +missing = type('MissingType', (), {'__repr__': lambda x: 'missing'})() + +# internal code +internal_code = set() + +concat = u''.join + +_slash_escape = '\\/' not in json.dumps('/') + + +def contextfunction(f): + """This decorator can be used to mark a function or method context callable. + A context callable is passed the active :class:`Context` as first argument when + called from the template. This is useful if a function wants to get access + to the context or functions provided on the context object. For example + a function that returns a sorted list of template variables the current + template exports could look like this:: + + @contextfunction + def get_exported_names(context): + return sorted(context.exported_vars) + """ + f.contextfunction = True + return f + + +def evalcontextfunction(f): + """This decorator can be used to mark a function or method as an eval + context callable. This is similar to the :func:`contextfunction` + but instead of passing the context, an evaluation context object is + passed. For more information about the eval context, see + :ref:`eval-context`. + + .. versionadded:: 2.4 + """ + f.evalcontextfunction = True + return f + + +def environmentfunction(f): + """This decorator can be used to mark a function or method as environment + callable. This decorator works exactly like the :func:`contextfunction` + decorator just that the first argument is the active :class:`Environment` + and not context. + """ + f.environmentfunction = True + return f + + +def internalcode(f): + """Marks the function as internally used""" + internal_code.add(f.__code__) + return f + + +def is_undefined(obj): + """Check if the object passed is undefined. This does nothing more than + performing an instance check against :class:`Undefined` but looks nicer. + This can be used for custom filters or tests that want to react to + undefined variables. For example a custom default filter can look like + this:: + + def default(var, default=''): + if is_undefined(var): + return default + return var + """ + from jinja2.runtime import Undefined + return isinstance(obj, Undefined) + + +def consume(iterable): + """Consumes an iterable without doing anything with it.""" + for event in iterable: + pass + + +def clear_caches(): + """Jinja2 keeps internal caches for environments and lexers. These are + used so that Jinja2 doesn't have to recreate environments and lexers all + the time. Normally you don't have to care about that but if you are + measuring memory consumption you may want to clean the caches. + """ + from jinja2.environment import _spontaneous_environments + from jinja2.lexer import _lexer_cache + _spontaneous_environments.clear() + _lexer_cache.clear() + + +def import_string(import_name, silent=False): + """Imports an object based on a string. This is useful if you want to + use import paths as endpoints or something similar. An import path can + be specified either in dotted notation (``xml.sax.saxutils.escape``) + or with a colon as object delimiter (``xml.sax.saxutils:escape``). + + If the `silent` is True the return value will be `None` if the import + fails. + + :return: imported object + """ + try: + if ':' in import_name: + module, obj = import_name.split(':', 1) + elif '.' in import_name: + items = import_name.split('.') + module = '.'.join(items[:-1]) + obj = items[-1] + else: + return __import__(import_name) + return getattr(__import__(module, None, None, [obj]), obj) + except (ImportError, AttributeError): + if not silent: + raise + + +def open_if_exists(filename, mode='rb'): + """Returns a file descriptor for the filename if that file exists, + otherwise `None`. + """ + try: + return open(filename, mode) + except IOError as e: + if e.errno not in (errno.ENOENT, errno.EISDIR, errno.EINVAL): + raise + + +def object_type_repr(obj): + """Returns the name of the object's type. For some recognized + singletons the name of the object is returned instead. (For + example for `None` and `Ellipsis`). + """ + if obj is None: + return 'None' + elif obj is Ellipsis: + return 'Ellipsis' + # __builtin__ in 2.x, builtins in 3.x + if obj.__class__.__module__ in ('__builtin__', 'builtins'): + name = obj.__class__.__name__ + else: + name = obj.__class__.__module__ + '.' + obj.__class__.__name__ + return '%s object' % name + + +def pformat(obj, verbose=False): + """Prettyprint an object. Either use the `pretty` library or the + builtin `pprint`. + """ + try: + from pretty import pretty + return pretty(obj, verbose=verbose) + except ImportError: + from pprint import pformat + return pformat(obj) + + +def urlize(text, trim_url_limit=None, rel=None, target=None): + """Converts any URLs in text into clickable links. Works on http://, + https:// and www. links. Links can have trailing punctuation (periods, + commas, close-parens) and leading punctuation (opening parens) and + it'll still do the right thing. + + If trim_url_limit is not None, the URLs in link text will be limited + to trim_url_limit characters. + + If nofollow is True, the URLs in link text will get a rel="nofollow" + attribute. + + If target is not None, a target attribute will be added to the link. + """ + trim_url = lambda x, limit=trim_url_limit: limit is not None \ + and (x[:limit] + (len(x) >=limit and '...' + or '')) or x + words = _word_split_re.split(text_type(escape(text))) + rel_attr = rel and ' rel="%s"' % text_type(escape(rel)) or '' + target_attr = target and ' target="%s"' % escape(target) or '' + + for i, word in enumerate(words): + match = _punctuation_re.match(word) + if match: + lead, middle, trail = match.groups() + if middle.startswith('www.') or ( + '@' not in middle and + not middle.startswith('http://') and + not middle.startswith('https://') and + len(middle) > 0 and + middle[0] in _letters + _digits and ( + middle.endswith('.org') or + middle.endswith('.net') or + middle.endswith('.com') + )): + middle = '<a href="http://%s"%s%s>%s</a>' % (middle, + rel_attr, target_attr, trim_url(middle)) + if middle.startswith('http://') or \ + middle.startswith('https://'): + middle = '<a href="%s"%s%s>%s</a>' % (middle, + rel_attr, target_attr, trim_url(middle)) + if '@' in middle and not middle.startswith('www.') and \ + not ':' in middle and _simple_email_re.match(middle): + middle = '<a href="mailto:%s">%s</a>' % (middle, middle) + if lead + middle + trail != word: + words[i] = lead + middle + trail + return u''.join(words) + + +def generate_lorem_ipsum(n=5, html=True, min=20, max=100): + """Generate some lorem ipsum for the template.""" + from jinja2.constants import LOREM_IPSUM_WORDS + from random import choice, randrange + words = LOREM_IPSUM_WORDS.split() + result = [] + + for _ in range(n): + next_capitalized = True + last_comma = last_fullstop = 0 + word = None + last = None + p = [] + + # each paragraph contains out of 20 to 100 words. + for idx, _ in enumerate(range(randrange(min, max))): + while True: + word = choice(words) + if word != last: + last = word + break + if next_capitalized: + word = word.capitalize() + next_capitalized = False + # add commas + if idx - randrange(3, 8) > last_comma: + last_comma = idx + last_fullstop += 2 + word += ',' + # add end of sentences + if idx - randrange(10, 20) > last_fullstop: + last_comma = last_fullstop = idx + word += '.' + next_capitalized = True + p.append(word) + + # ensure that the paragraph ends with a dot. + p = u' '.join(p) + if p.endswith(','): + p = p[:-1] + '.' + elif not p.endswith('.'): + p += '.' + result.append(p) + + if not html: + return u'\n\n'.join(result) + return Markup(u'\n'.join(u'<p>%s</p>' % escape(x) for x in result)) + + +def unicode_urlencode(obj, charset='utf-8', for_qs=False): + """URL escapes a single bytestring or unicode string with the + given charset if applicable to URL safe quoting under all rules + that need to be considered under all supported Python versions. + + If non strings are provided they are converted to their unicode + representation first. + """ + if not isinstance(obj, string_types): + obj = text_type(obj) + if isinstance(obj, text_type): + obj = obj.encode(charset) + safe = not for_qs and b'/' or b'' + rv = text_type(url_quote(obj, safe)) + if for_qs: + rv = rv.replace('%20', '+') + return rv + + +class LRUCache(object): + """A simple LRU Cache implementation.""" + + # this is fast for small capacities (something below 1000) but doesn't + # scale. But as long as it's only used as storage for templates this + # won't do any harm. + + def __init__(self, capacity): + self.capacity = capacity + self._mapping = {} + self._queue = deque() + self._postinit() + + def _postinit(self): + # alias all queue methods for faster lookup + self._popleft = self._queue.popleft + self._pop = self._queue.pop + self._remove = self._queue.remove + self._wlock = Lock() + self._append = self._queue.append + + def __getstate__(self): + return { + 'capacity': self.capacity, + '_mapping': self._mapping, + '_queue': self._queue + } + + def __setstate__(self, d): + self.__dict__.update(d) + self._postinit() + + def __getnewargs__(self): + return (self.capacity,) + + def copy(self): + """Return a shallow copy of the instance.""" + rv = self.__class__(self.capacity) + rv._mapping.update(self._mapping) + rv._queue = deque(self._queue) + return rv + + def get(self, key, default=None): + """Return an item from the cache dict or `default`""" + try: + return self[key] + except KeyError: + return default + + def setdefault(self, key, default=None): + """Set `default` if the key is not in the cache otherwise + leave unchanged. Return the value of this key. + """ + self._wlock.acquire() + try: + try: + return self[key] + except KeyError: + self[key] = default + return default + finally: + self._wlock.release() + + def clear(self): + """Clear the cache.""" + self._wlock.acquire() + try: + self._mapping.clear() + self._queue.clear() + finally: + self._wlock.release() + + def __contains__(self, key): + """Check if a key exists in this cache.""" + return key in self._mapping + + def __len__(self): + """Return the current size of the cache.""" + return len(self._mapping) + + def __repr__(self): + return '<%s %r>' % ( + self.__class__.__name__, + self._mapping + ) + + def __getitem__(self, key): + """Get an item from the cache. Moves the item up so that it has the + highest priority then. + + Raise a `KeyError` if it does not exist. + """ + self._wlock.acquire() + try: + rv = self._mapping[key] + if self._queue[-1] != key: + try: + self._remove(key) + except ValueError: + # if something removed the key from the container + # when we read, ignore the ValueError that we would + # get otherwise. + pass + self._append(key) + return rv + finally: + self._wlock.release() + + def __setitem__(self, key, value): + """Sets the value for an item. Moves the item up so that it + has the highest priority then. + """ + self._wlock.acquire() + try: + if key in self._mapping: + self._remove(key) + elif len(self._mapping) == self.capacity: + del self._mapping[self._popleft()] + self._append(key) + self._mapping[key] = value + finally: + self._wlock.release() + + def __delitem__(self, key): + """Remove an item from the cache dict. + Raise a `KeyError` if it does not exist. + """ + self._wlock.acquire() + try: + del self._mapping[key] + try: + self._remove(key) + except ValueError: + # __getitem__ is not locked, it might happen + pass + finally: + self._wlock.release() + + def items(self): + """Return a list of items.""" + result = [(key, self._mapping[key]) for key in list(self._queue)] + result.reverse() + return result + + def iteritems(self): + """Iterate over all items.""" + return iter(self.items()) + + def values(self): + """Return a list of all values.""" + return [x[1] for x in self.items()] + + def itervalue(self): + """Iterate over all values.""" + return iter(self.values()) + + def keys(self): + """Return a list of all keys ordered by most recent usage.""" + return list(self) + + def iterkeys(self): + """Iterate over all keys in the cache dict, ordered by + the most recent usage. + """ + return reversed(tuple(self._queue)) + + __iter__ = iterkeys + + def __reversed__(self): + """Iterate over the values in the cache dict, oldest items + coming first. + """ + return iter(tuple(self._queue)) + + __copy__ = copy + + +# register the LRU cache as mutable mapping if possible +try: + from collections import MutableMapping + MutableMapping.register(LRUCache) +except ImportError: + pass + + +def select_autoescape(enabled_extensions=('html', 'htm', 'xml'), + disabled_extensions=(), + default_for_string=True, + default=False): + """Intelligently sets the initial value of autoescaping based on the + filename of the template. This is the recommended way to configure + autoescaping if you do not want to write a custom function yourself. + + If you want to enable it for all templates created from strings or + for all templates with `.html` and `.xml` extensions:: + + from jinja2 import Environment, select_autoescape + env = Environment(autoescape=select_autoescape( + enabled_extensions=('html', 'xml'), + default_for_string=True, + )) + + Example configuration to turn it on at all times except if the template + ends with `.txt`:: + + from jinja2 import Environment, select_autoescape + env = Environment(autoescape=select_autoescape( + disabled_extensions=('txt',), + default_for_string=True, + default=True, + )) + + The `enabled_extensions` is an iterable of all the extensions that + autoescaping should be enabled for. Likewise `disabled_extensions` is + a list of all templates it should be disabled for. If a template is + loaded from a string then the default from `default_for_string` is used. + If nothing matches then the initial value of autoescaping is set to the + value of `default`. + + For security reasons this function operates case insensitive. + + .. versionadded:: 2.9 + """ + enabled_patterns = tuple('.' + x.lstrip('.').lower() + for x in enabled_extensions) + disabled_patterns = tuple('.' + x.lstrip('.').lower() + for x in disabled_extensions) + def autoescape(template_name): + if template_name is None: + return default_for_string + template_name = template_name.lower() + if template_name.endswith(enabled_patterns): + return True + if template_name.endswith(disabled_patterns): + return False + return default + return autoescape + + +def htmlsafe_json_dumps(obj, dumper=None, **kwargs): + """Works exactly like :func:`dumps` but is safe for use in ``<script>`` + tags. It accepts the same arguments and returns a JSON string. Note that + this is available in templates through the ``|tojson`` filter which will + also mark the result as safe. Due to how this function escapes certain + characters this is safe even if used outside of ``<script>`` tags. + + The following characters are escaped in strings: + + - ``<`` + - ``>`` + - ``&`` + - ``'`` + + This makes it safe to embed such strings in any place in HTML with the + notable exception of double quoted attributes. In that case single + quote your attributes or HTML escape it in addition. + """ + if dumper is None: + dumper = json.dumps + rv = dumper(obj, **kwargs) \ + .replace(u'<', u'\\u003c') \ + .replace(u'>', u'\\u003e') \ + .replace(u'&', u'\\u0026') \ + .replace(u"'", u'\\u0027') + return Markup(rv) + + +@implements_iterator +class Cycler(object): + """A cycle helper for templates.""" + + def __init__(self, *items): + if not items: + raise RuntimeError('at least one item has to be provided') + self.items = items + self.reset() + + def reset(self): + """Resets the cycle.""" + self.pos = 0 + + @property + def current(self): + """Returns the current item.""" + return self.items[self.pos] + + def next(self): + """Goes one item ahead and returns it.""" + rv = self.current + self.pos = (self.pos + 1) % len(self.items) + return rv + + __next__ = next + + +class Joiner(object): + """A joining helper for templates.""" + + def __init__(self, sep=u', '): + self.sep = sep + self.used = False + + def __call__(self): + if not self.used: + self.used = True + return u'' + return self.sep + + +class Namespace(object): + """A namespace object that can hold arbitrary attributes. It may be + initialized from a dictionary or with keyword argments.""" + + def __init__(*args, **kwargs): + self, args = args[0], args[1:] + self.__attrs = dict(*args, **kwargs) + + def __getattribute__(self, name): + if name == '_Namespace__attrs': + return object.__getattribute__(self, name) + try: + return self.__attrs[name] + except KeyError: + raise AttributeError(name) + + def __setitem__(self, name, value): + self.__attrs[name] = value + + def __repr__(self): + return '<Namespace %r>' % self.__attrs + + +# does this python version support async for in and async generators? +try: + exec('async def _():\n async for _ in ():\n yield _') + have_async_gen = True +except SyntaxError: + have_async_gen = False + + +# Imported here because that's where it was in the past +from markupsafe import Markup, escape, soft_unicode diff --git a/python/jinja2/visitor.py b/python/jinja2/visitor.py new file mode 100644 index 0000000..ba526df --- /dev/null +++ b/python/jinja2/visitor.py @@ -0,0 +1,87 @@ +# -*- coding: utf-8 -*- +""" + jinja2.visitor + ~~~~~~~~~~~~~~ + + This module implements a visitor for the nodes. + + :copyright: (c) 2017 by the Jinja Team. + :license: BSD. +""" +from jinja2.nodes import Node + + +class NodeVisitor(object): + """Walks the abstract syntax tree and call visitor functions for every + node found. The visitor functions may return values which will be + forwarded by the `visit` method. + + Per default the visitor functions for the nodes are ``'visit_'`` + + class name of the node. So a `TryFinally` node visit function would + be `visit_TryFinally`. This behavior can be changed by overriding + the `get_visitor` function. If no visitor function exists for a node + (return value `None`) the `generic_visit` visitor is used instead. + """ + + def get_visitor(self, node): + """Return the visitor function for this node or `None` if no visitor + exists for this node. In that case the generic visit function is + used instead. + """ + method = 'visit_' + node.__class__.__name__ + return getattr(self, method, None) + + def visit(self, node, *args, **kwargs): + """Visit a node.""" + f = self.get_visitor(node) + if f is not None: + return f(node, *args, **kwargs) + return self.generic_visit(node, *args, **kwargs) + + def generic_visit(self, node, *args, **kwargs): + """Called if no explicit visitor function exists for a node.""" + for node in node.iter_child_nodes(): + self.visit(node, *args, **kwargs) + + +class NodeTransformer(NodeVisitor): + """Walks the abstract syntax tree and allows modifications of nodes. + + The `NodeTransformer` will walk the AST and use the return value of the + visitor functions to replace or remove the old node. If the return + value of the visitor function is `None` the node will be removed + from the previous location otherwise it's replaced with the return + value. The return value may be the original node in which case no + replacement takes place. + """ + + def generic_visit(self, node, *args, **kwargs): + for field, old_value in node.iter_fields(): + if isinstance(old_value, list): + new_values = [] + for value in old_value: + if isinstance(value, Node): + value = self.visit(value, *args, **kwargs) + if value is None: + continue + elif not isinstance(value, Node): + new_values.extend(value) + continue + new_values.append(value) + old_value[:] = new_values + elif isinstance(old_value, Node): + new_node = self.visit(old_value, *args, **kwargs) + if new_node is None: + delattr(node, field) + else: + setattr(node, field, new_node) + return node + + def visit_list(self, node, *args, **kwargs): + """As transformers may return lists in some places this method + can be used to enforce a list as return value. + """ + rv = self.visit(node, *args, **kwargs) + if not isinstance(rv, list): + rv = [rv] + return rv |