1844 lines
65 KiB
Python
1844 lines
65 KiB
Python
# -*- coding: utf-8 -*-
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"""Compiles nodes from the parser into Python code."""
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from collections import namedtuple
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from functools import update_wrapper
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from itertools import chain
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from keyword import iskeyword as is_python_keyword
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from markupsafe import escape
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from markupsafe import Markup
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from . import nodes
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from ._compat import imap
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from ._compat import iteritems
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from ._compat import izip
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from ._compat import NativeStringIO
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from ._compat import range_type
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from ._compat import string_types
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from ._compat import text_type
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from .exceptions import TemplateAssertionError
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from .idtracking import Symbols
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from .idtracking import VAR_LOAD_ALIAS
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from .idtracking import VAR_LOAD_PARAMETER
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from .idtracking import VAR_LOAD_RESOLVE
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from .idtracking import VAR_LOAD_UNDEFINED
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from .nodes import EvalContext
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from .optimizer import Optimizer
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from .utils import concat
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from .visitor import NodeVisitor
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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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code_features = ["division"]
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# does this python version support generator stops? (PEP 0479)
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try:
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exec("from __future__ import generator_stop")
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code_features.append("generator_stop")
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except SyntaxError:
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pass
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# does this python version support yield from?
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try:
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exec("def f(): yield from x()")
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except SyntaxError:
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supports_yield_from = False
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else:
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supports_yield_from = True
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def optimizeconst(f):
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def new_func(self, node, frame, **kwargs):
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# Only optimize if the frame is not volatile
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if self.optimized and not frame.eval_ctx.volatile:
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new_node = self.optimizer.visit(node, frame.eval_ctx)
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if new_node != node:
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return self.visit(new_node, frame)
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return f(self, node, frame, **kwargs)
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return update_wrapper(new_func, f)
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def generate(
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node, environment, name, filename, stream=None, defer_init=False, optimized=True
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):
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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 = environment.code_generator_class(
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environment, name, filename, stream, defer_init, optimized
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)
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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 type(value) in (bool, int, float, complex, range_type, Markup) + string_types:
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return True
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if type(value) in (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 type(value) is 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 MacroRef(object):
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def __init__(self, node):
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self.node = node
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self.accesses_caller = False
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self.accesses_kwargs = False
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self.accesses_varargs = False
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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, level=None):
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self.eval_ctx = eval_ctx
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self.symbols = Symbols(parent and parent.symbols or None, level=level)
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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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# 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.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.symbols = self.symbols.copy()
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return rv
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def inner(self, isolated=False):
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"""Return an inner frame."""
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if isolated:
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return Frame(self.eval_ctx, level=self.symbols.level + 1)
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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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This is only used to implement if-statements.
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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 CompilerExit(Exception):
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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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class CodeGenerator(NodeVisitor):
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def __init__(
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self, environment, name, filename, stream=None, defer_init=False, optimized=True
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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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self.optimized = optimized
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if optimized:
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self.optimizer = Optimizer(environment)
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# aliases for imports
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self.import_aliases = {}
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# a registry for all blocks. Because blocks are moved out
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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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# 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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# the current line number
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self.code_lineno = 1
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# registry of all filters and tests (global, not block local)
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self.tests = {}
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self.filters = {}
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# the debug information
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self.debug_info = []
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self._write_debug_info = None
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# the number of new lines before the next write()
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self._new_lines = 0
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# the line number of the last written statement
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self._last_line = 0
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# true if nothing was written so far.
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self._first_write = True
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# used by the `temporary_identifier` method to get new
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# unique, temporary identifier
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self._last_identifier = 0
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# the current indentation
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self._indentation = 0
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# Tracks toplevel assignments
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self._assign_stack = []
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# Tracks parameter definition blocks
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self._param_def_block = []
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# Tracks the current context.
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self._context_reference_stack = ["context"]
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# -- Various compilation helpers
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def fail(self, msg, lineno):
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"""Fail with a :exc:`TemplateAssertionError`."""
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raise TemplateAssertionError(msg, lineno, self.name, self.filename)
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def temporary_identifier(self):
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"""Get a new unique identifier."""
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self._last_identifier += 1
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return "t_%d" % self._last_identifier
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def buffer(self, frame):
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"""Enable buffering for the frame from that point onwards."""
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frame.buffer = self.temporary_identifier()
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self.writeline("%s = []" % frame.buffer)
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def return_buffer_contents(self, frame, force_unescaped=False):
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"""Return the buffer contents of the frame."""
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if not force_unescaped:
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if frame.eval_ctx.volatile:
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self.writeline("if context.eval_ctx.autoescape:")
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self.indent()
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self.writeline("return Markup(concat(%s))" % frame.buffer)
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self.outdent()
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self.writeline("else:")
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self.indent()
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self.writeline("return concat(%s)" % frame.buffer)
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self.outdent()
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return
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elif frame.eval_ctx.autoescape:
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self.writeline("return Markup(concat(%s))" % frame.buffer)
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return
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self.writeline("return concat(%s)" % frame.buffer)
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def indent(self):
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"""Indent by one."""
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self._indentation += 1
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def outdent(self, step=1):
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"""Outdent by step."""
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self._indentation -= step
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def start_write(self, frame, node=None):
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"""Yield or write into the frame buffer."""
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if frame.buffer is None:
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self.writeline("yield ", node)
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else:
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self.writeline("%s.append(" % frame.buffer, node)
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def end_write(self, frame):
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"""End the writing process started by `start_write`."""
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if frame.buffer is not None:
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self.write(")")
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def simple_write(self, s, frame, node=None):
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"""Simple shortcut for start_write + write + end_write."""
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self.start_write(frame, node)
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self.write(s)
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self.end_write(frame)
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def blockvisit(self, nodes, frame):
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"""Visit a list of nodes as block in a frame. If the current frame
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is no buffer a dummy ``if 0: yield None`` is written automatically.
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"""
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try:
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self.writeline("pass")
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for node in nodes:
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self.visit(node, frame)
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except CompilerExit:
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pass
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def write(self, x):
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"""Write a string into the output stream."""
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if self._new_lines:
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if not self._first_write:
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self.stream.write("\n" * self._new_lines)
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self.code_lineno += self._new_lines
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if self._write_debug_info is not None:
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self.debug_info.append((self._write_debug_info, self.code_lineno))
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self._write_debug_info = None
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self._first_write = False
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self.stream.write(" " * self._indentation)
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self._new_lines = 0
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self.stream.write(x)
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def writeline(self, x, node=None, extra=0):
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"""Combination of newline and write."""
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self.newline(node, extra)
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self.write(x)
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def newline(self, node=None, extra=0):
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"""Add one or more newlines before the next write."""
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self._new_lines = max(self._new_lines, 1 + extra)
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if node is not None and node.lineno != self._last_line:
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self._write_debug_info = node.lineno
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self._last_line = node.lineno
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def signature(self, node, frame, extra_kwargs=None):
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"""Writes a function call to the stream for the current node.
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A leading comma is added automatically. The extra keyword
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arguments may not include python keywords otherwise a syntax
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error could occur. The extra keyword arguments should be given
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as python dict.
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"""
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# if any of the given keyword arguments is a python keyword
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# we have to make sure that no invalid call is created.
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kwarg_workaround = False
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for kwarg in chain((x.key for x in node.kwargs), extra_kwargs or ()):
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if is_python_keyword(kwarg):
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kwarg_workaround = True
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break
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for arg in node.args:
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self.write(", ")
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self.visit(arg, frame)
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if not kwarg_workaround:
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for kwarg in node.kwargs:
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self.write(", ")
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self.visit(kwarg, frame)
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if extra_kwargs is not None:
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for key, value in iteritems(extra_kwargs):
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self.write(", %s=%s" % (key, value))
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if node.dyn_args:
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self.write(", *")
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self.visit(node.dyn_args, frame)
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if kwarg_workaround:
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if node.dyn_kwargs is not None:
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self.write(", **dict({")
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else:
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self.write(", **{")
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for kwarg in node.kwargs:
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self.write("%r: " % kwarg.key)
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self.visit(kwarg.value, frame)
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self.write(", ")
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|
if extra_kwargs is not None:
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for key, value in iteritems(extra_kwargs):
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self.write("%r: %s, " % (key, value))
|
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if node.dyn_kwargs is not None:
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|
self.write("}, **")
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self.visit(node.dyn_kwargs, frame)
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self.write(")")
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|
else:
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|
self.write("}")
|
|
|
|
elif node.dyn_kwargs is not None:
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|
self.write(", **")
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self.visit(node.dyn_kwargs, frame)
|
|
|
|
def pull_dependencies(self, nodes):
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"""Pull all the dependencies."""
|
|
visitor = DependencyFinderVisitor()
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for node in nodes:
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visitor.visit(node)
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for dependency in "filters", "tests":
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|
mapping = getattr(self, dependency)
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|
for name in getattr(visitor, dependency):
|
|
if name not in mapping:
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|
mapping[name] = self.temporary_identifier()
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self.writeline(
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"%s = environment.%s[%r]" % (mapping[name], dependency, name)
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)
|
|
|
|
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:
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|
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 Jinja 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 "kwargs" not in skip_special_params:
|
|
args.append(frame.symbols.declare_parameter("kwargs"))
|
|
macro_ref.accesses_kwargs = True
|
|
if "varargs" in undeclared and "varargs" not 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")
|
|
# always use the standard Undefined class for the implicit else of
|
|
# conditional expressions
|
|
self.writeline("cond_expr_undefined = 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 .runtime import 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, AsyncLoopContext"
|
|
)
|
|
|
|
# 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 AsyncLoopContext(" % 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)
|
|
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 target, expr in 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)
|
|
|
|
_FinalizeInfo = namedtuple("_FinalizeInfo", ("const", "src"))
|
|
#: The default finalize function if the environment isn't configured
|
|
#: with one. Or if the environment has one, this is called on that
|
|
#: function's output for constants.
|
|
_default_finalize = text_type
|
|
_finalize = None
|
|
|
|
def _make_finalize(self):
|
|
"""Build the finalize function to be used on constants and at
|
|
runtime. Cached so it's only created once for all output nodes.
|
|
|
|
Returns a ``namedtuple`` with the following attributes:
|
|
|
|
``const``
|
|
A function to finalize constant data at compile time.
|
|
|
|
``src``
|
|
Source code to output around nodes to be evaluated at
|
|
runtime.
|
|
"""
|
|
if self._finalize is not None:
|
|
return self._finalize
|
|
|
|
finalize = default = self._default_finalize
|
|
src = None
|
|
|
|
if self.environment.finalize:
|
|
src = "environment.finalize("
|
|
env_finalize = self.environment.finalize
|
|
|
|
def finalize(value):
|
|
return default(env_finalize(value))
|
|
|
|
if getattr(env_finalize, "contextfunction", False) is True:
|
|
src += "context, "
|
|
finalize = None # noqa: F811
|
|
elif getattr(env_finalize, "evalcontextfunction", False) is True:
|
|
src += "context.eval_ctx, "
|
|
finalize = None
|
|
elif getattr(env_finalize, "environmentfunction", False) is True:
|
|
src += "environment, "
|
|
|
|
def finalize(value):
|
|
return default(env_finalize(self.environment, value))
|
|
|
|
self._finalize = self._FinalizeInfo(finalize, src)
|
|
return self._finalize
|
|
|
|
def _output_const_repr(self, group):
|
|
"""Given a group of constant values converted from ``Output``
|
|
child nodes, produce a string to write to the template module
|
|
source.
|
|
"""
|
|
return repr(concat(group))
|
|
|
|
def _output_child_to_const(self, node, frame, finalize):
|
|
"""Try to optimize a child of an ``Output`` node by trying to
|
|
convert it to constant, finalized data at compile time.
|
|
|
|
If :exc:`Impossible` is raised, the node is not constant and
|
|
will be evaluated at runtime. Any other exception will also be
|
|
evaluated at runtime for easier debugging.
|
|
"""
|
|
const = node.as_const(frame.eval_ctx)
|
|
|
|
if frame.eval_ctx.autoescape:
|
|
const = escape(const)
|
|
|
|
# Template data doesn't go through finalize.
|
|
if isinstance(node, nodes.TemplateData):
|
|
return text_type(const)
|
|
|
|
return finalize.const(const)
|
|
|
|
def _output_child_pre(self, node, frame, finalize):
|
|
"""Output extra source code before visiting a child of an
|
|
``Output`` node.
|
|
"""
|
|
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 finalize.src is not None:
|
|
self.write(finalize.src)
|
|
|
|
def _output_child_post(self, node, frame, finalize):
|
|
"""Output extra source code after visiting a child of an
|
|
``Output`` node.
|
|
"""
|
|
self.write(")")
|
|
|
|
if finalize.src is not None:
|
|
self.write(")")
|
|
|
|
def visit_Output(self, node, frame):
|
|
# If an extends is active, don't render outside a block.
|
|
if frame.require_output_check:
|
|
# A top-level extends is known to exist at compile time.
|
|
if self.has_known_extends:
|
|
return
|
|
|
|
self.writeline("if parent_template is None:")
|
|
self.indent()
|
|
|
|
finalize = self._make_finalize()
|
|
body = []
|
|
|
|
# Evaluate constants at compile time if possible. Each item in
|
|
# body will be either a list of static data or a node to be
|
|
# evaluated at runtime.
|
|
for child in node.nodes:
|
|
try:
|
|
if not (
|
|
# If the finalize function requires runtime context,
|
|
# constants can't be evaluated at compile time.
|
|
finalize.const
|
|
# Unless it's basic template data that won't be
|
|
# finalized anyway.
|
|
or isinstance(child, nodes.TemplateData)
|
|
):
|
|
raise nodes.Impossible()
|
|
|
|
const = self._output_child_to_const(child, frame, finalize)
|
|
except (nodes.Impossible, Exception):
|
|
# The node was not constant and needs to be evaluated at
|
|
# runtime. Or another error was raised, which is easier
|
|
# to debug at runtime.
|
|
body.append(child)
|
|
continue
|
|
|
|
if body and isinstance(body[-1], list):
|
|
body[-1].append(const)
|
|
else:
|
|
body.append([const])
|
|
|
|
if frame.buffer is not None:
|
|
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):
|
|
# A group of constant data to join and output.
|
|
val = self._output_const_repr(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)
|
|
|
|
# A node to be evaluated at runtime.
|
|
self._output_child_pre(item, frame, finalize)
|
|
self.visit(item, frame)
|
|
self._output_child_post(item, frame, finalize)
|
|
|
|
if frame.buffer is not None:
|
|
self.write(",")
|
|
|
|
if frame.buffer is not None:
|
|
self.outdent()
|
|
self.writeline(")" if len(body) == 1 else "))")
|
|
|
|
if frame.require_output_check:
|
|
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): # noqa: B902
|
|
@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): # noqa: B902
|
|
@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.write("(")
|
|
self.visit(node.expr, frame)
|
|
for op in node.ops:
|
|
self.visit(op, frame)
|
|
self.write(")")
|
|
|
|
def visit_Operand(self, node, frame):
|
|
self.write(" %s " % operators[node.op])
|
|
self.visit(node.expr, frame)
|
|
|
|
@optimizeconst
|
|
def visit_Getattr(self, node, frame):
|
|
if self.environment.is_async:
|
|
self.write("(await auto_await(")
|
|
|
|
self.write("environment.getattr(")
|
|
self.visit(node.node, frame)
|
|
self.write(", %r)" % node.attr)
|
|
|
|
if self.environment.is_async:
|
|
self.write("))")
|
|
|
|
@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:
|
|
if self.environment.is_async:
|
|
self.write("(await auto_await(")
|
|
|
|
self.write("environment.getitem(")
|
|
self.visit(node.node, frame)
|
|
self.write(", ")
|
|
self.visit(node.arg, frame)
|
|
self.write(")")
|
|
|
|
if self.environment.is_async:
|
|
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) is True:
|
|
self.write("context, ")
|
|
elif getattr(func, "evalcontextfilter", False) is True:
|
|
self.write("context.eval_ctx, ")
|
|
elif getattr(func, "environmentfilter", False) is True:
|
|
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(
|
|
"cond_expr_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_DerivedContextReference(self, node, frame):
|
|
self.write(self.derive_context(frame))
|
|
|
|
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)
|