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-rw-r--r--python/jinja2/compiler.py1721
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diff --git a/python/jinja2/compiler.py b/python/jinja2/compiler.py
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+# -*- 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)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 13:32:10 +0000