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Diffstat (limited to 'python/jinja2/compiler.py')
| -rw-r--r-- | python/jinja2/compiler.py | 1721 |
1 files changed, 0 insertions, 1721 deletions
diff --git a/python/jinja2/compiler.py b/python/jinja2/compiler.py deleted file mode 100644 index d534a82..0000000 --- a/python/jinja2/compiler.py +++ /dev/null @@ -1,1721 +0,0 @@ -# -*- 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) |