1641 lines
60 KiB
Python
1641 lines
60 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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jinja2.compiler
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~~~~~~~~~~~~~~~
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Compiles nodes into python code.
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:copyright: (c) 2010 by the Jinja Team.
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:license: BSD, see LICENSE for more details.
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"""
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from itertools import chain
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from copy import deepcopy
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from keyword import iskeyword as is_python_keyword
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from jinja2 import nodes
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from jinja2.nodes import EvalContext
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from jinja2.visitor import NodeVisitor
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from jinja2.exceptions import TemplateAssertionError
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from jinja2.utils import Markup, concat, escape
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from jinja2._compat import range_type, next, text_type, string_types, \
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iteritems, NativeStringIO, imap
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operators = {
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'eq': '==',
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'ne': '!=',
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'gt': '>',
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'gteq': '>=',
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'lt': '<',
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'lteq': '<=',
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'in': 'in',
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'notin': 'not in'
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}
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# what method to iterate over items do we want to use for dict iteration
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# in generated code? on 2.x let's go with iteritems, on 3.x with items
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if hasattr(dict, 'iteritems'):
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dict_item_iter = 'iteritems'
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else:
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dict_item_iter = 'items'
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# does if 0: dummy(x) get us x into the scope?
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def unoptimize_before_dead_code():
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x = 42
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def f():
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if 0: dummy(x)
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return f
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# The getattr is necessary for pypy which does not set this attribute if
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# no closure is on the function
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unoptimize_before_dead_code = bool(
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getattr(unoptimize_before_dead_code(), '__closure__', None))
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def generate(node, environment, name, filename, stream=None,
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defer_init=False):
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"""Generate the python source for a node tree."""
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if not isinstance(node, nodes.Template):
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raise TypeError('Can\'t compile non template nodes')
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generator = CodeGenerator(environment, name, filename, stream, defer_init)
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generator.visit(node)
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if stream is None:
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return generator.stream.getvalue()
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def has_safe_repr(value):
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"""Does the node have a safe representation?"""
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if value is None or value is NotImplemented or value is Ellipsis:
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return True
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if isinstance(value, (bool, int, float, complex, range_type,
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Markup) + string_types):
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return True
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if isinstance(value, (tuple, list, set, frozenset)):
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for item in value:
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if not has_safe_repr(item):
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return False
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return True
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elif isinstance(value, dict):
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for key, value in iteritems(value):
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if not has_safe_repr(key):
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return False
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if not has_safe_repr(value):
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return False
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return True
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return False
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def find_undeclared(nodes, names):
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"""Check if the names passed are accessed undeclared. The return value
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is a set of all the undeclared names from the sequence of names found.
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"""
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visitor = UndeclaredNameVisitor(names)
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try:
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for node in nodes:
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visitor.visit(node)
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except VisitorExit:
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pass
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return visitor.undeclared
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class Identifiers(object):
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"""Tracks the status of identifiers in frames."""
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def __init__(self):
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# variables that are known to be declared (probably from outer
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# frames or because they are special for the frame)
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self.declared = set()
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# undeclared variables from outer scopes
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self.outer_undeclared = set()
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# names that are accessed without being explicitly declared by
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# this one or any of the outer scopes. Names can appear both in
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# declared and undeclared.
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self.undeclared = set()
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# names that are declared locally
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self.declared_locally = set()
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# names that are declared by parameters
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self.declared_parameter = set()
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def add_special(self, name):
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"""Register a special name like `loop`."""
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self.undeclared.discard(name)
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self.declared.add(name)
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def is_declared(self, name):
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"""Check if a name is declared in this or an outer scope."""
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if name in self.declared_locally or name in self.declared_parameter:
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return True
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return name in self.declared
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def copy(self):
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return deepcopy(self)
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class Frame(object):
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"""Holds compile time information for us."""
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def __init__(self, eval_ctx, parent=None):
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self.eval_ctx = eval_ctx
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self.identifiers = Identifiers()
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# a toplevel frame is the root + soft frames such as if conditions.
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self.toplevel = False
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# the root frame is basically just the outermost frame, so no if
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# conditions. This information is used to optimize inheritance
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# situations.
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self.rootlevel = False
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# in some dynamic inheritance situations the compiler needs to add
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# write tests around output statements.
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self.require_output_check = parent and parent.require_output_check
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# inside some tags we are using a buffer rather than yield statements.
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# this for example affects {% filter %} or {% macro %}. If a frame
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# is buffered this variable points to the name of the list used as
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# buffer.
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self.buffer = None
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# the name of the block we're in, otherwise None.
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self.block = parent and parent.block or None
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# a set of actually assigned names
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self.assigned_names = set()
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# the parent of this frame
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self.parent = parent
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if parent is not None:
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self.identifiers.declared.update(
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parent.identifiers.declared |
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parent.identifiers.declared_parameter |
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parent.assigned_names
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)
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self.identifiers.outer_undeclared.update(
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parent.identifiers.undeclared -
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self.identifiers.declared
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)
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self.buffer = parent.buffer
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def copy(self):
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"""Create a copy of the current one."""
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rv = object.__new__(self.__class__)
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rv.__dict__.update(self.__dict__)
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rv.identifiers = object.__new__(self.identifiers.__class__)
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rv.identifiers.__dict__.update(self.identifiers.__dict__)
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return rv
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def inspect(self, nodes):
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"""Walk the node and check for identifiers. If the scope is hard (eg:
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enforce on a python level) overrides from outer scopes are tracked
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differently.
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"""
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visitor = FrameIdentifierVisitor(self.identifiers)
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for node in nodes:
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visitor.visit(node)
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def find_shadowed(self, extra=()):
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"""Find all the shadowed names. extra is an iterable of variables
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that may be defined with `add_special` which may occour scoped.
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"""
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i = self.identifiers
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return (i.declared | i.outer_undeclared) & \
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(i.declared_locally | i.declared_parameter) | \
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set(x for x in extra if i.is_declared(x))
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def inner(self):
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"""Return an inner frame."""
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return Frame(self.eval_ctx, self)
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def soft(self):
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"""Return a soft frame. A soft frame may not be modified as
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standalone thing as it shares the resources with the frame it
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was created of, but it's not a rootlevel frame any longer.
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"""
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rv = self.copy()
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rv.rootlevel = False
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return rv
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__copy__ = copy
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class VisitorExit(RuntimeError):
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"""Exception used by the `UndeclaredNameVisitor` to signal a stop."""
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class DependencyFinderVisitor(NodeVisitor):
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"""A visitor that collects filter and test calls."""
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def __init__(self):
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self.filters = set()
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self.tests = set()
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def visit_Filter(self, node):
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self.generic_visit(node)
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self.filters.add(node.name)
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def visit_Test(self, node):
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self.generic_visit(node)
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self.tests.add(node.name)
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def visit_Block(self, node):
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"""Stop visiting at blocks."""
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class UndeclaredNameVisitor(NodeVisitor):
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"""A visitor that checks if a name is accessed without being
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declared. This is different from the frame visitor as it will
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not stop at closure frames.
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"""
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def __init__(self, names):
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self.names = set(names)
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self.undeclared = set()
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def visit_Name(self, node):
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if node.ctx == 'load' and node.name in self.names:
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self.undeclared.add(node.name)
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if self.undeclared == self.names:
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raise VisitorExit()
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else:
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self.names.discard(node.name)
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def visit_Block(self, node):
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"""Stop visiting a blocks."""
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class FrameIdentifierVisitor(NodeVisitor):
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"""A visitor for `Frame.inspect`."""
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def __init__(self, identifiers):
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self.identifiers = identifiers
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def visit_Name(self, node):
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"""All assignments to names go through this function."""
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if node.ctx == 'store':
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self.identifiers.declared_locally.add(node.name)
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elif node.ctx == 'param':
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self.identifiers.declared_parameter.add(node.name)
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elif node.ctx == 'load' and not \
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self.identifiers.is_declared(node.name):
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self.identifiers.undeclared.add(node.name)
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def visit_If(self, node):
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self.visit(node.test)
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real_identifiers = self.identifiers
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old_names = real_identifiers.declared_locally | \
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real_identifiers.declared_parameter
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def inner_visit(nodes):
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if not nodes:
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return set()
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self.identifiers = real_identifiers.copy()
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for subnode in nodes:
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self.visit(subnode)
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rv = self.identifiers.declared_locally - old_names
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# we have to remember the undeclared variables of this branch
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# because we will have to pull them.
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real_identifiers.undeclared.update(self.identifiers.undeclared)
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self.identifiers = real_identifiers
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return rv
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body = inner_visit(node.body)
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else_ = inner_visit(node.else_ or ())
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# the differences between the two branches are also pulled as
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# undeclared variables
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real_identifiers.undeclared.update(body.symmetric_difference(else_) -
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real_identifiers.declared)
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# remember those that are declared.
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real_identifiers.declared_locally.update(body | else_)
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def visit_Macro(self, node):
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self.identifiers.declared_locally.add(node.name)
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def visit_Import(self, node):
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self.generic_visit(node)
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self.identifiers.declared_locally.add(node.target)
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def visit_FromImport(self, node):
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self.generic_visit(node)
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for name in node.names:
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if isinstance(name, tuple):
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self.identifiers.declared_locally.add(name[1])
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else:
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self.identifiers.declared_locally.add(name)
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def visit_Assign(self, node):
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"""Visit assignments in the correct order."""
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self.visit(node.node)
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self.visit(node.target)
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def visit_For(self, node):
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"""Visiting stops at for blocks. However the block sequence
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is visited as part of the outer scope.
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"""
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self.visit(node.iter)
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def visit_CallBlock(self, node):
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self.visit(node.call)
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def visit_FilterBlock(self, node):
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self.visit(node.filter)
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def visit_Scope(self, node):
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"""Stop visiting at scopes."""
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def visit_Block(self, node):
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"""Stop visiting at blocks."""
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||
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class CompilerExit(Exception):
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||
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"""Raised if the compiler encountered a situation where it just
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doesn't make sense to further process the code. Any block that
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raises such an exception is not further processed.
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"""
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||
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class CodeGenerator(NodeVisitor):
|
||
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||
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def __init__(self, environment, name, filename, stream=None,
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defer_init=False):
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||
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if stream is None:
|
||
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stream = NativeStringIO()
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self.environment = environment
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self.name = name
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self.filename = filename
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self.stream = stream
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self.created_block_context = False
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self.defer_init = defer_init
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||
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# aliases for imports
|
||
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self.import_aliases = {}
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||
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# a registry for all blocks. Because blocks are moved out
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||
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# into the global python scope they are registered here
|
||
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self.blocks = {}
|
||
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# the number of extends statements so far
|
||
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self.extends_so_far = 0
|
||
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|
||
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# some templates have a rootlevel extends. In this case we
|
||
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# can safely assume that we're a child template and do some
|
||
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# more optimizations.
|
||
|
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self.has_known_extends = False
|
||
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|
||
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# the current line number
|
||
|
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self.code_lineno = 1
|
||
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|
||
|
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# registry of all filters and tests (global, not block local)
|
||
|
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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
|
||
|
|
|
||
|
|
# -- 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):
|
||
|
|
"""Return the buffer contents of the frame."""
|
||
|
|
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()
|
||
|
|
elif frame.eval_ctx.autoescape:
|
||
|
|
self.writeline('return Markup(concat(%s))' % frame.buffer)
|
||
|
|
else:
|
||
|
|
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
|
||
|
|
unless the force_generator parameter is set to False.
|
||
|
|
"""
|
||
|
|
if frame.buffer is None:
|
||
|
|
self.writeline('if 0: yield None')
|
||
|
|
else:
|
||
|
|
self.writeline('pass')
|
||
|
|
try:
|
||
|
|
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_locals(self, frame):
|
||
|
|
"""Pull all the references identifiers into the local scope."""
|
||
|
|
for name in frame.identifiers.undeclared:
|
||
|
|
self.writeline('l_%s = context.resolve(%r)' % (name, name))
|
||
|
|
|
||
|
|
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 unoptimize_scope(self, frame):
|
||
|
|
"""Disable Python optimizations for the frame."""
|
||
|
|
# XXX: this is not that nice but it has no real overhead. It
|
||
|
|
# mainly works because python finds the locals before dead code
|
||
|
|
# is removed. If that breaks we have to add a dummy function
|
||
|
|
# that just accepts the arguments and does nothing.
|
||
|
|
if frame.identifiers.declared:
|
||
|
|
self.writeline('%sdummy(%s)' % (
|
||
|
|
unoptimize_before_dead_code and 'if 0: ' or '',
|
||
|
|
', '.join('l_' + name for name in frame.identifiers.declared)
|
||
|
|
))
|
||
|
|
|
||
|
|
def push_scope(self, frame, extra_vars=()):
|
||
|
|
"""This function returns all the shadowed variables in a dict
|
||
|
|
in the form name: alias and will write the required assignments
|
||
|
|
into the current scope. No indentation takes place.
|
||
|
|
|
||
|
|
This also predefines locally declared variables from the loop
|
||
|
|
body because under some circumstances it may be the case that
|
||
|
|
|
||
|
|
`extra_vars` is passed to `Frame.find_shadowed`.
|
||
|
|
"""
|
||
|
|
aliases = {}
|
||
|
|
for name in frame.find_shadowed(extra_vars):
|
||
|
|
aliases[name] = ident = self.temporary_identifier()
|
||
|
|
self.writeline('%s = l_%s' % (ident, name))
|
||
|
|
to_declare = set()
|
||
|
|
for name in frame.identifiers.declared_locally:
|
||
|
|
if name not in aliases:
|
||
|
|
to_declare.add('l_' + name)
|
||
|
|
if to_declare:
|
||
|
|
self.writeline(' = '.join(to_declare) + ' = missing')
|
||
|
|
return aliases
|
||
|
|
|
||
|
|
def pop_scope(self, aliases, frame):
|
||
|
|
"""Restore all aliases and delete unused variables."""
|
||
|
|
for name, alias in iteritems(aliases):
|
||
|
|
self.writeline('l_%s = %s' % (name, alias))
|
||
|
|
to_delete = set()
|
||
|
|
for name in frame.identifiers.declared_locally:
|
||
|
|
if name not in aliases:
|
||
|
|
to_delete.add('l_' + name)
|
||
|
|
if to_delete:
|
||
|
|
# we cannot use the del statement here because enclosed
|
||
|
|
# scopes can trigger a SyntaxError:
|
||
|
|
# a = 42; b = lambda: a; del a
|
||
|
|
self.writeline(' = '.join(to_delete) + ' = missing')
|
||
|
|
|
||
|
|
def function_scoping(self, node, frame, children=None,
|
||
|
|
find_special=True):
|
||
|
|
"""In Jinja a few statements require the help of anonymous
|
||
|
|
functions. Those are currently macros and call blocks and in
|
||
|
|
the future also recursive loops. As there is currently
|
||
|
|
technical limitation that doesn't allow reading and writing a
|
||
|
|
variable in a scope where the initial value is coming from an
|
||
|
|
outer scope, this function tries to fall back with a common
|
||
|
|
error message. Additionally the frame passed is modified so
|
||
|
|
that the argumetns are collected and callers are looked up.
|
||
|
|
|
||
|
|
This will return the modified frame.
|
||
|
|
"""
|
||
|
|
# we have to iterate twice over it, make sure that works
|
||
|
|
if children is None:
|
||
|
|
children = node.iter_child_nodes()
|
||
|
|
children = list(children)
|
||
|
|
func_frame = frame.inner()
|
||
|
|
func_frame.inspect(children)
|
||
|
|
|
||
|
|
# variables that are undeclared (accessed before declaration) and
|
||
|
|
# declared locally *and* part of an outside scope raise a template
|
||
|
|
# assertion error. Reason: we can't generate reasonable code from
|
||
|
|
# it without aliasing all the variables.
|
||
|
|
# this could be fixed in Python 3 where we have the nonlocal
|
||
|
|
# keyword or if we switch to bytecode generation
|
||
|
|
overridden_closure_vars = (
|
||
|
|
func_frame.identifiers.undeclared &
|
||
|
|
func_frame.identifiers.declared &
|
||
|
|
(func_frame.identifiers.declared_locally |
|
||
|
|
func_frame.identifiers.declared_parameter)
|
||
|
|
)
|
||
|
|
if overridden_closure_vars:
|
||
|
|
self.fail('It\'s not possible to set and access variables '
|
||
|
|
'derived from an outer scope! (affects: %s)' %
|
||
|
|
', '.join(sorted(overridden_closure_vars)), node.lineno)
|
||
|
|
|
||
|
|
# remove variables from a closure from the frame's undeclared
|
||
|
|
# identifiers.
|
||
|
|
func_frame.identifiers.undeclared -= (
|
||
|
|
func_frame.identifiers.undeclared &
|
||
|
|
func_frame.identifiers.declared
|
||
|
|
)
|
||
|
|
|
||
|
|
# no special variables for this scope, abort early
|
||
|
|
if not find_special:
|
||
|
|
return func_frame
|
||
|
|
|
||
|
|
func_frame.accesses_kwargs = False
|
||
|
|
func_frame.accesses_varargs = False
|
||
|
|
func_frame.accesses_caller = False
|
||
|
|
func_frame.arguments = args = ['l_' + x.name for x in node.args]
|
||
|
|
|
||
|
|
undeclared = find_undeclared(children, ('caller', 'kwargs', 'varargs'))
|
||
|
|
|
||
|
|
if 'caller' in undeclared:
|
||
|
|
func_frame.accesses_caller = True
|
||
|
|
func_frame.identifiers.add_special('caller')
|
||
|
|
args.append('l_caller')
|
||
|
|
if 'kwargs' in undeclared:
|
||
|
|
func_frame.accesses_kwargs = True
|
||
|
|
func_frame.identifiers.add_special('kwargs')
|
||
|
|
args.append('l_kwargs')
|
||
|
|
if 'varargs' in undeclared:
|
||
|
|
func_frame.accesses_varargs = True
|
||
|
|
func_frame.identifiers.add_special('varargs')
|
||
|
|
args.append('l_varargs')
|
||
|
|
return func_frame
|
||
|
|
|
||
|
|
def macro_body(self, node, frame, children=None):
|
||
|
|
"""Dump the function def of a macro or call block."""
|
||
|
|
frame = self.function_scoping(node, frame, children)
|
||
|
|
# macros are delayed, they never require output checks
|
||
|
|
frame.require_output_check = False
|
||
|
|
args = frame.arguments
|
||
|
|
# XXX: this is an ugly fix for the loop nesting bug
|
||
|
|
# (tests.test_old_bugs.test_loop_call_bug). This works around
|
||
|
|
# a identifier nesting problem we have in general. It's just more
|
||
|
|
# likely to happen in loops which is why we work around it. The
|
||
|
|
# real solution would be "nonlocal" all the identifiers that are
|
||
|
|
# leaking into a new python frame and might be used both unassigned
|
||
|
|
# and assigned.
|
||
|
|
if 'loop' in frame.identifiers.declared:
|
||
|
|
args = args + ['l_loop=l_loop']
|
||
|
|
self.writeline('def macro(%s):' % ', '.join(args), node)
|
||
|
|
self.indent()
|
||
|
|
self.buffer(frame)
|
||
|
|
self.pull_locals(frame)
|
||
|
|
self.blockvisit(node.body, frame)
|
||
|
|
self.return_buffer_contents(frame)
|
||
|
|
self.outdent()
|
||
|
|
return frame
|
||
|
|
|
||
|
|
def macro_def(self, node, frame):
|
||
|
|
"""Dump the macro definition for the def created by macro_body."""
|
||
|
|
arg_tuple = ', '.join(repr(x.name) for x in node.args)
|
||
|
|
name = getattr(node, 'name', None)
|
||
|
|
if len(node.args) == 1:
|
||
|
|
arg_tuple += ','
|
||
|
|
self.write('Macro(environment, macro, %r, (%s), (' %
|
||
|
|
(name, arg_tuple))
|
||
|
|
for arg in node.defaults:
|
||
|
|
self.visit(arg, frame)
|
||
|
|
self.write(', ')
|
||
|
|
self.write('), %r, %r, %r)' % (
|
||
|
|
bool(frame.accesses_kwargs),
|
||
|
|
bool(frame.accesses_varargs),
|
||
|
|
bool(frame.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
|
||
|
|
|
||
|
|
# -- 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 division')
|
||
|
|
self.writeline('from jinja2.runtime import ' + ', '.join(exported))
|
||
|
|
if not unoptimize_before_dead_code:
|
||
|
|
self.writeline('dummy = lambda *x: None')
|
||
|
|
|
||
|
|
# 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('def root(context%s):' % envenv, extra=1)
|
||
|
|
|
||
|
|
# process the root
|
||
|
|
frame = Frame(eval_ctx)
|
||
|
|
frame.inspect(node.body)
|
||
|
|
frame.toplevel = frame.rootlevel = True
|
||
|
|
frame.require_output_check = have_extends and not self.has_known_extends
|
||
|
|
self.indent()
|
||
|
|
if have_extends:
|
||
|
|
self.writeline('parent_template = None')
|
||
|
|
if 'self' in find_undeclared(node.body, ('self',)):
|
||
|
|
frame.identifiers.add_special('self')
|
||
|
|
self.writeline('l_self = TemplateReference(context)')
|
||
|
|
self.pull_locals(frame)
|
||
|
|
self.pull_dependencies(node.body)
|
||
|
|
self.blockvisit(node.body, frame)
|
||
|
|
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()
|
||
|
|
self.writeline('for event in parent_template.'
|
||
|
|
'root_render_func(context):')
|
||
|
|
self.indent()
|
||
|
|
self.writeline('yield event')
|
||
|
|
self.outdent(2 + (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):
|
||
|
|
block_frame = Frame(eval_ctx)
|
||
|
|
block_frame.inspect(block.body)
|
||
|
|
block_frame.block = name
|
||
|
|
self.writeline('def block_%s(context%s):' % (name, envenv),
|
||
|
|
block, 1)
|
||
|
|
self.indent()
|
||
|
|
undeclared = find_undeclared(block.body, ('self', 'super'))
|
||
|
|
if 'self' in undeclared:
|
||
|
|
block_frame.identifiers.add_special('self')
|
||
|
|
self.writeline('l_self = TemplateReference(context)')
|
||
|
|
if 'super' in undeclared:
|
||
|
|
block_frame.identifiers.add_special('super')
|
||
|
|
self.writeline('l_super = context.super(%r, '
|
||
|
|
'block_%s)' % (name, name))
|
||
|
|
self.pull_locals(block_frame)
|
||
|
|
self.pull_dependencies(block.body)
|
||
|
|
self.blockvisit(block.body, block_frame)
|
||
|
|
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 = 1
|
||
|
|
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
|
||
|
|
context = node.scoped and 'context.derived(locals())' or 'context'
|
||
|
|
self.writeline('for event in context.blocks[%r][0](%s):' % (
|
||
|
|
node.name, context), node)
|
||
|
|
self.indent()
|
||
|
|
self.simple_write('event', frame)
|
||
|
|
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.with_context:
|
||
|
|
self.unoptimize_scope(frame)
|
||
|
|
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()
|
||
|
|
|
||
|
|
if node.with_context:
|
||
|
|
self.writeline('for event in template.root_render_func('
|
||
|
|
'template.new_context(context.parent, True, '
|
||
|
|
'locals())):')
|
||
|
|
else:
|
||
|
|
self.writeline('for event in template.module._body_stream:')
|
||
|
|
|
||
|
|
self.indent()
|
||
|
|
self.simple_write('event', frame)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
if node.ignore_missing:
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
def visit_Import(self, node, frame):
|
||
|
|
"""Visit regular imports."""
|
||
|
|
if node.with_context:
|
||
|
|
self.unoptimize_scope(frame)
|
||
|
|
self.writeline('l_%s = ' % node.target, node)
|
||
|
|
if frame.toplevel:
|
||
|
|
self.write('context.vars[%r] = ' % node.target)
|
||
|
|
self.write('environment.get_template(')
|
||
|
|
self.visit(node.template, frame)
|
||
|
|
self.write(', %r).' % self.name)
|
||
|
|
if node.with_context:
|
||
|
|
self.write('make_module(context.parent, True, locals())')
|
||
|
|
else:
|
||
|
|
self.write('module')
|
||
|
|
if frame.toplevel and not node.target.startswith('_'):
|
||
|
|
self.writeline('context.exported_vars.discard(%r)' % node.target)
|
||
|
|
frame.assigned_names.add(node.target)
|
||
|
|
|
||
|
|
def visit_FromImport(self, node, frame):
|
||
|
|
"""Visit named imports."""
|
||
|
|
self.newline(node)
|
||
|
|
self.write('included_template = environment.get_template(')
|
||
|
|
self.visit(node.template, frame)
|
||
|
|
self.write(', %r).' % self.name)
|
||
|
|
if node.with_context:
|
||
|
|
self.write('make_module(context.parent, True)')
|
||
|
|
else:
|
||
|
|
self.write('module')
|
||
|
|
|
||
|
|
var_names = []
|
||
|
|
discarded_names = []
|
||
|
|
for name in node.names:
|
||
|
|
if isinstance(name, tuple):
|
||
|
|
name, alias = name
|
||
|
|
else:
|
||
|
|
alias = name
|
||
|
|
self.writeline('l_%s = getattr(included_template, '
|
||
|
|
'%r, missing)' % (alias, name))
|
||
|
|
self.writeline('if l_%s is missing:' % alias)
|
||
|
|
self.indent()
|
||
|
|
self.writeline('l_%s = environment.undefined(%r %% '
|
||
|
|
'included_template.__name__, '
|
||
|
|
'name=%r)' %
|
||
|
|
(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)
|
||
|
|
frame.assigned_names.add(alias)
|
||
|
|
|
||
|
|
if var_names:
|
||
|
|
if len(var_names) == 1:
|
||
|
|
name = var_names[0]
|
||
|
|
self.writeline('context.vars[%r] = l_%s' % (name, name))
|
||
|
|
else:
|
||
|
|
self.writeline('context.vars.update({%s})' % ', '.join(
|
||
|
|
'%r: l_%s' % (name, 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):
|
||
|
|
# when calculating the nodes for the inner frame we have to exclude
|
||
|
|
# the iterator contents from it
|
||
|
|
children = node.iter_child_nodes(exclude=('iter',))
|
||
|
|
if node.recursive:
|
||
|
|
loop_frame = self.function_scoping(node, frame, children,
|
||
|
|
find_special=False)
|
||
|
|
else:
|
||
|
|
loop_frame = frame.inner()
|
||
|
|
loop_frame.inspect(children)
|
||
|
|
|
||
|
|
# 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',))
|
||
|
|
|
||
|
|
# 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 not node.recursive:
|
||
|
|
aliases = self.push_scope(loop_frame, ('loop',))
|
||
|
|
|
||
|
|
# otherwise we set up a buffer and add a function def
|
||
|
|
else:
|
||
|
|
self.writeline('def loop(reciter, loop_render_func, depth=0):', node)
|
||
|
|
self.indent()
|
||
|
|
self.buffer(loop_frame)
|
||
|
|
aliases = {}
|
||
|
|
|
||
|
|
# 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('l_loop = missing')
|
||
|
|
loop_frame.identifiers.add_special('loop')
|
||
|
|
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)
|
||
|
|
|
||
|
|
self.pull_locals(loop_frame)
|
||
|
|
if node.else_:
|
||
|
|
iteration_indicator = self.temporary_identifier()
|
||
|
|
self.writeline('%s = 1' % iteration_indicator)
|
||
|
|
|
||
|
|
# Create a fake parent loop if the else or test section of a
|
||
|
|
# loop is accessing the special loop variable and no parent loop
|
||
|
|
# exists.
|
||
|
|
if 'loop' not in aliases and 'loop' in find_undeclared(
|
||
|
|
node.iter_child_nodes(only=('else_', 'test')), ('loop',)):
|
||
|
|
self.writeline("l_loop = environment.undefined(%r, name='loop')" %
|
||
|
|
("'loop' is undefined. the filter section of a loop as well "
|
||
|
|
"as the else block don't have access to the special 'loop'"
|
||
|
|
" variable of the current loop. Because there is no parent "
|
||
|
|
"loop it's undefined. Happened in loop on %s" %
|
||
|
|
self.position(node)))
|
||
|
|
|
||
|
|
self.writeline('for ', node)
|
||
|
|
self.visit(node.target, loop_frame)
|
||
|
|
self.write(extended_loop and ', l_loop in LoopContext(' or ' in ')
|
||
|
|
|
||
|
|
# if we have an extened loop and a node test, we filter in the
|
||
|
|
# "outer frame".
|
||
|
|
if extended_loop and node.test is not None:
|
||
|
|
self.write('(')
|
||
|
|
self.visit(node.target, loop_frame)
|
||
|
|
self.write(' for ')
|
||
|
|
self.visit(node.target, loop_frame)
|
||
|
|
self.write(' in ')
|
||
|
|
if node.recursive:
|
||
|
|
self.write('reciter')
|
||
|
|
else:
|
||
|
|
self.visit(node.iter, loop_frame)
|
||
|
|
self.write(' if (')
|
||
|
|
test_frame = loop_frame.copy()
|
||
|
|
self.visit(node.test, test_frame)
|
||
|
|
self.write('))')
|
||
|
|
|
||
|
|
elif node.recursive:
|
||
|
|
self.write('reciter')
|
||
|
|
else:
|
||
|
|
self.visit(node.iter, loop_frame)
|
||
|
|
|
||
|
|
if node.recursive:
|
||
|
|
self.write(', loop_render_func, depth):')
|
||
|
|
else:
|
||
|
|
self.write(extended_loop and '):' or ':')
|
||
|
|
|
||
|
|
# tests in not extended loops become a continue
|
||
|
|
if not extended_loop and node.test is not None:
|
||
|
|
self.indent()
|
||
|
|
self.writeline('if not ')
|
||
|
|
self.visit(node.test, loop_frame)
|
||
|
|
self.write(':')
|
||
|
|
self.indent()
|
||
|
|
self.writeline('continue')
|
||
|
|
self.outdent(2)
|
||
|
|
|
||
|
|
self.indent()
|
||
|
|
self.blockvisit(node.body, loop_frame)
|
||
|
|
if node.else_:
|
||
|
|
self.writeline('%s = 0' % iteration_indicator)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
if node.else_:
|
||
|
|
self.writeline('if %s:' % iteration_indicator)
|
||
|
|
self.indent()
|
||
|
|
self.blockvisit(node.else_, loop_frame)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
# reset the aliases if there are any.
|
||
|
|
if not node.recursive:
|
||
|
|
self.pop_scope(aliases, loop_frame)
|
||
|
|
|
||
|
|
# 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)
|
||
|
|
self.write('loop(')
|
||
|
|
self.visit(node.iter, frame)
|
||
|
|
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()
|
||
|
|
if node.else_:
|
||
|
|
self.writeline('else:')
|
||
|
|
self.indent()
|
||
|
|
self.blockvisit(node.else_, if_frame)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
def visit_Macro(self, node, frame):
|
||
|
|
macro_frame = self.macro_body(node, frame)
|
||
|
|
self.newline()
|
||
|
|
if frame.toplevel:
|
||
|
|
if not node.name.startswith('_'):
|
||
|
|
self.write('context.exported_vars.add(%r)' % node.name)
|
||
|
|
self.writeline('context.vars[%r] = ' % node.name)
|
||
|
|
self.write('l_%s = ' % node.name)
|
||
|
|
self.macro_def(node, macro_frame)
|
||
|
|
frame.assigned_names.add(node.name)
|
||
|
|
|
||
|
|
def visit_CallBlock(self, node, frame):
|
||
|
|
children = node.iter_child_nodes(exclude=('call',))
|
||
|
|
call_frame = self.macro_body(node, frame, children)
|
||
|
|
self.writeline('caller = ')
|
||
|
|
self.macro_def(node, call_frame)
|
||
|
|
self.start_write(frame, node)
|
||
|
|
self.visit_Call(node.call, call_frame, forward_caller=True)
|
||
|
|
self.end_write(frame)
|
||
|
|
|
||
|
|
def visit_FilterBlock(self, node, frame):
|
||
|
|
filter_frame = frame.inner()
|
||
|
|
filter_frame.inspect(node.iter_child_nodes())
|
||
|
|
aliases = self.push_scope(filter_frame)
|
||
|
|
self.pull_locals(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.pop_scope(aliases, filter_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
|
||
|
|
|
||
|
|
if self.environment.finalize:
|
||
|
|
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:
|
||
|
|
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('(context.eval_ctx.autoescape and'
|
||
|
|
' escape or 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(')
|
||
|
|
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)) + ' % (')
|
||
|
|
idx = -1
|
||
|
|
self.indent()
|
||
|
|
for argument in arguments:
|
||
|
|
self.newline(argument)
|
||
|
|
close = 0
|
||
|
|
if frame.eval_ctx.volatile:
|
||
|
|
self.write('(context.eval_ctx.autoescape and'
|
||
|
|
' escape or 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(')
|
||
|
|
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.newline(node)
|
||
|
|
# toplevel assignments however go into the local namespace and
|
||
|
|
# the current template's context. We create a copy of the frame
|
||
|
|
# here and add a set so that the Name visitor can add the assigned
|
||
|
|
# names here.
|
||
|
|
if frame.toplevel:
|
||
|
|
assignment_frame = frame.copy()
|
||
|
|
assignment_frame.toplevel_assignments = set()
|
||
|
|
else:
|
||
|
|
assignment_frame = frame
|
||
|
|
self.visit(node.target, assignment_frame)
|
||
|
|
self.write(' = ')
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
|
||
|
|
# make sure toplevel assignments are added to the context.
|
||
|
|
if frame.toplevel:
|
||
|
|
public_names = [x for x in assignment_frame.toplevel_assignments
|
||
|
|
if not x.startswith('_')]
|
||
|
|
if len(assignment_frame.toplevel_assignments) == 1:
|
||
|
|
name = next(iter(assignment_frame.toplevel_assignments))
|
||
|
|
self.writeline('context.vars[%r] = l_%s' % (name, name))
|
||
|
|
else:
|
||
|
|
self.writeline('context.vars.update({')
|
||
|
|
for idx, name in enumerate(assignment_frame.toplevel_assignments):
|
||
|
|
if idx:
|
||
|
|
self.write(', ')
|
||
|
|
self.write('%r: l_%s' % (name, name))
|
||
|
|
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)))
|
||
|
|
|
||
|
|
# -- Expression Visitors
|
||
|
|
|
||
|
|
def visit_Name(self, node, frame):
|
||
|
|
if node.ctx == 'store' and frame.toplevel:
|
||
|
|
frame.toplevel_assignments.add(node.name)
|
||
|
|
self.write('l_' + node.name)
|
||
|
|
frame.assigned_names.add(node.name)
|
||
|
|
|
||
|
|
def visit_Const(self, node, frame):
|
||
|
|
val = node.value
|
||
|
|
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('(context.eval_ctx.autoescape and Markup or 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):
|
||
|
|
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):
|
||
|
|
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
|
||
|
|
|
||
|
|
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('))')
|
||
|
|
|
||
|
|
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)
|
||
|
|
|
||
|
|
def visit_Getattr(self, node, frame):
|
||
|
|
self.write('environment.getattr(')
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
self.write(', %r)' % node.attr)
|
||
|
|
|
||
|
|
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)
|
||
|
|
|
||
|
|
def visit_Filter(self, node, frame):
|
||
|
|
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(')')
|
||
|
|
|
||
|
|
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(')')
|
||
|
|
|
||
|
|
def visit_CondExpr(self, node, frame):
|
||
|
|
def write_expr2():
|
||
|
|
if node.expr2 is not None:
|
||
|
|
return self.visit(node.expr2, frame)
|
||
|
|
self.write('environment.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(')')
|
||
|
|
|
||
|
|
def visit_Call(self, node, frame, forward_caller=False):
|
||
|
|
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(')')
|
||
|
|
|
||
|
|
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.inspect(node.iter_child_nodes())
|
||
|
|
aliases = self.push_scope(scope_frame)
|
||
|
|
self.pull_locals(scope_frame)
|
||
|
|
self.blockvisit(node.body, scope_frame)
|
||
|
|
self.pop_scope(aliases, scope_frame)
|
||
|
|
|
||
|
|
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()
|
||
|
|
safed_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(safed_ctx)
|
||
|
|
self.writeline('context.eval_ctx.revert(%s)' % old_ctx_name)
|