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1654 lines
62 KiB
Python
1654 lines
62 KiB
Python
8 years ago
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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) 2017 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 functools import update_wrapper
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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.optimizer import Optimizer
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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, text_type, string_types, \
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iteritems, NativeStringIO, imap, izip
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from jinja2.idtracking import Symbols, VAR_LOAD_PARAMETER, \
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VAR_LOAD_RESOLVE, VAR_LOAD_ALIAS, VAR_LOAD_UNDEFINED
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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(node, environment, name, filename, stream=None,
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defer_init=False, optimized=True):
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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(environment, name, filename,
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stream, defer_init,
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optimized)
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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):
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self.eval_ctx = eval_ctx
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self.symbols = Symbols(parent and parent.symbols or None)
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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):
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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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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__(self, environment, name, filename, stream=None,
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defer_init=False, optimized=True):
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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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# -- 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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||
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elif frame.eval_ctx.autoescape:
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||
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self.writeline('return Markup(concat(%s))' % frame.buffer)
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||
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return
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self.writeline('return concat(%s)' % frame.buffer)
|
||
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||
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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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|
||
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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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|
|
||
|
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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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|
||
|
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def blockvisit(self, nodes, frame):
|
||
|
|
"""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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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:
|
||
|
|
if not self._first_write:
|
||
|
|
self.stream.write('\n' * self._new_lines)
|
||
|
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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
|
||
|
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self.stream.write(' ' * self._indentation)
|
||
|
|
self._new_lines = 0
|
||
|
|
self.stream.write(x)
|
||
|
|
|
||
|
|
def writeline(self, x, node=None, extra=0):
|
||
|
|
"""Combination of newline and write."""
|
||
|
|
self.newline(node, extra)
|
||
|
|
self.write(x)
|
||
|
|
|
||
|
|
def newline(self, node=None, extra=0):
|
||
|
|
"""Add one or more newlines before the next write."""
|
||
|
|
self._new_lines = max(self._new_lines, 1 + extra)
|
||
|
|
if node is not None and node.lineno != self._last_line:
|
||
|
|
self._write_debug_info = node.lineno
|
||
|
|
self._last_line = node.lineno
|
||
|
|
|
||
|
|
def signature(self, node, frame, extra_kwargs=None):
|
||
|
|
"""Writes a function call to the stream for the current node.
|
||
|
|
A leading comma is added automatically. The extra keyword
|
||
|
|
arguments may not include python keywords otherwise a syntax
|
||
|
|
error could occour. The extra keyword arguments should be given
|
||
|
|
as python dict.
|
||
|
|
"""
|
||
|
|
# if any of the given keyword arguments is a python keyword
|
||
|
|
# we have to make sure that no invalid call is created.
|
||
|
|
kwarg_workaround = False
|
||
|
|
for kwarg in chain((x.key for x in node.kwargs), extra_kwargs or ()):
|
||
|
|
if is_python_keyword(kwarg):
|
||
|
|
kwarg_workaround = True
|
||
|
|
break
|
||
|
|
|
||
|
|
for arg in node.args:
|
||
|
|
self.write(', ')
|
||
|
|
self.visit(arg, frame)
|
||
|
|
|
||
|
|
if not kwarg_workaround:
|
||
|
|
for kwarg in node.kwargs:
|
||
|
|
self.write(', ')
|
||
|
|
self.visit(kwarg, frame)
|
||
|
|
if extra_kwargs is not None:
|
||
|
|
for key, value in iteritems(extra_kwargs):
|
||
|
|
self.write(', %s=%s' % (key, value))
|
||
|
|
if node.dyn_args:
|
||
|
|
self.write(', *')
|
||
|
|
self.visit(node.dyn_args, frame)
|
||
|
|
|
||
|
|
if kwarg_workaround:
|
||
|
|
if node.dyn_kwargs is not None:
|
||
|
|
self.write(', **dict({')
|
||
|
|
else:
|
||
|
|
self.write(', **{')
|
||
|
|
for kwarg in node.kwargs:
|
||
|
|
self.write('%r: ' % kwarg.key)
|
||
|
|
self.visit(kwarg.value, frame)
|
||
|
|
self.write(', ')
|
||
|
|
if extra_kwargs is not None:
|
||
|
|
for key, value in iteritems(extra_kwargs):
|
||
|
|
self.write('%r: %s, ' % (key, value))
|
||
|
|
if node.dyn_kwargs is not None:
|
||
|
|
self.write('}, **')
|
||
|
|
self.visit(node.dyn_kwargs, frame)
|
||
|
|
self.write(')')
|
||
|
|
else:
|
||
|
|
self.write('}')
|
||
|
|
|
||
|
|
elif node.dyn_kwargs is not None:
|
||
|
|
self.write(', **')
|
||
|
|
self.visit(node.dyn_kwargs, frame)
|
||
|
|
|
||
|
|
def pull_dependencies(self, nodes):
|
||
|
|
"""Pull all the dependencies."""
|
||
|
|
visitor = DependencyFinderVisitor()
|
||
|
|
for node in nodes:
|
||
|
|
visitor.visit(node)
|
||
|
|
for dependency in 'filters', 'tests':
|
||
|
|
mapping = getattr(self, dependency)
|
||
|
|
for name in getattr(visitor, dependency):
|
||
|
|
if name not in mapping:
|
||
|
|
mapping[name] = self.temporary_identifier()
|
||
|
|
self.writeline('%s = environment.%s[%r]' %
|
||
|
|
(mapping[name], dependency, name))
|
||
|
|
|
||
|
|
def enter_frame(self, frame):
|
||
|
|
undefs = []
|
||
|
|
for target, (action, param) in iteritems(frame.symbols.loads):
|
||
|
|
if action == VAR_LOAD_PARAMETER:
|
||
|
|
pass
|
||
|
|
elif action == VAR_LOAD_RESOLVE:
|
||
|
|
self.writeline('%s = resolve(%r)' %
|
||
|
|
(target, param))
|
||
|
|
elif action == VAR_LOAD_ALIAS:
|
||
|
|
self.writeline('%s = %s' % (target, param))
|
||
|
|
elif action == VAR_LOAD_UNDEFINED:
|
||
|
|
undefs.append(target)
|
||
|
|
else:
|
||
|
|
raise NotImplementedError('unknown load instruction')
|
||
|
|
if undefs:
|
||
|
|
self.writeline('%s = missing' % ' = '.join(undefs))
|
||
|
|
|
||
|
|
def leave_frame(self, frame, with_python_scope=False):
|
||
|
|
if not with_python_scope:
|
||
|
|
undefs = []
|
||
|
|
for target, _ in iteritems(frame.symbols.loads):
|
||
|
|
undefs.append(target)
|
||
|
|
if undefs:
|
||
|
|
self.writeline('%s = missing' % ' = '.join(undefs))
|
||
|
|
|
||
|
|
def func(self, name):
|
||
|
|
if self.environment.is_async:
|
||
|
|
return 'async def %s' % name
|
||
|
|
return 'def %s' % name
|
||
|
|
|
||
|
|
def macro_body(self, node, frame):
|
||
|
|
"""Dump the function def of a macro or call block."""
|
||
|
|
frame = frame.inner()
|
||
|
|
frame.symbols.analyze_node(node)
|
||
|
|
macro_ref = MacroRef(node)
|
||
|
|
|
||
|
|
explicit_caller = None
|
||
|
|
skip_special_params = set()
|
||
|
|
args = []
|
||
|
|
for idx, arg in enumerate(node.args):
|
||
|
|
if arg.name == 'caller':
|
||
|
|
explicit_caller = idx
|
||
|
|
if arg.name in ('kwargs', 'varargs'):
|
||
|
|
skip_special_params.add(arg.name)
|
||
|
|
args.append(frame.symbols.ref(arg.name))
|
||
|
|
|
||
|
|
undeclared = find_undeclared(node.body, ('caller', 'kwargs', 'varargs'))
|
||
|
|
|
||
|
|
if 'caller' in undeclared:
|
||
|
|
# In older Jinja2 versions there was a bug that allowed caller
|
||
|
|
# to retain the special behavior even if it was mentioned in
|
||
|
|
# the argument list. However thankfully this was only really
|
||
|
|
# working if it was the last argument. So we are explicitly
|
||
|
|
# checking this now and error out if it is anywhere else in
|
||
|
|
# the argument list.
|
||
|
|
if explicit_caller is not None:
|
||
|
|
try:
|
||
|
|
node.defaults[explicit_caller - len(node.args)]
|
||
|
|
except IndexError:
|
||
|
|
self.fail('When defining macros or call blocks the '
|
||
|
|
'special "caller" argument must be omitted '
|
||
|
|
'or be given a default.', node.lineno)
|
||
|
|
else:
|
||
|
|
args.append(frame.symbols.declare_parameter('caller'))
|
||
|
|
macro_ref.accesses_caller = True
|
||
|
|
if 'kwargs' in undeclared and not 'kwargs' in skip_special_params:
|
||
|
|
args.append(frame.symbols.declare_parameter('kwargs'))
|
||
|
|
macro_ref.accesses_kwargs = True
|
||
|
|
if 'varargs' in undeclared and not 'varargs' in skip_special_params:
|
||
|
|
args.append(frame.symbols.declare_parameter('varargs'))
|
||
|
|
macro_ref.accesses_varargs = True
|
||
|
|
|
||
|
|
# macros are delayed, they never require output checks
|
||
|
|
frame.require_output_check = False
|
||
|
|
frame.symbols.analyze_node(node)
|
||
|
|
self.writeline('%s(%s):' % (self.func('macro'), ', '.join(args)), node)
|
||
|
|
self.indent()
|
||
|
|
|
||
|
|
self.buffer(frame)
|
||
|
|
self.enter_frame(frame)
|
||
|
|
|
||
|
|
self.push_parameter_definitions(frame)
|
||
|
|
for idx, arg in enumerate(node.args):
|
||
|
|
ref = frame.symbols.ref(arg.name)
|
||
|
|
self.writeline('if %s is missing:' % ref)
|
||
|
|
self.indent()
|
||
|
|
try:
|
||
|
|
default = node.defaults[idx - len(node.args)]
|
||
|
|
except IndexError:
|
||
|
|
self.writeline('%s = undefined(%r, name=%r)' % (
|
||
|
|
ref,
|
||
|
|
'parameter %r was not provided' % arg.name,
|
||
|
|
arg.name))
|
||
|
|
else:
|
||
|
|
self.writeline('%s = ' % ref)
|
||
|
|
self.visit(default, frame)
|
||
|
|
self.mark_parameter_stored(ref)
|
||
|
|
self.outdent()
|
||
|
|
self.pop_parameter_definitions()
|
||
|
|
|
||
|
|
self.blockvisit(node.body, frame)
|
||
|
|
self.return_buffer_contents(frame, force_unescaped=True)
|
||
|
|
self.leave_frame(frame, with_python_scope=True)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
return frame, macro_ref
|
||
|
|
|
||
|
|
def macro_def(self, macro_ref, frame):
|
||
|
|
"""Dump the macro definition for the def created by macro_body."""
|
||
|
|
arg_tuple = ', '.join(repr(x.name) for x in macro_ref.node.args)
|
||
|
|
name = getattr(macro_ref.node, 'name', None)
|
||
|
|
if len(macro_ref.node.args) == 1:
|
||
|
|
arg_tuple += ','
|
||
|
|
self.write('Macro(environment, macro, %r, (%s), %r, %r, %r, '
|
||
|
|
'context.eval_ctx.autoescape)' %
|
||
|
|
(name, arg_tuple, macro_ref.accesses_kwargs,
|
||
|
|
macro_ref.accesses_varargs, macro_ref.accesses_caller))
|
||
|
|
|
||
|
|
def position(self, node):
|
||
|
|
"""Return a human readable position for the node."""
|
||
|
|
rv = 'line %d' % node.lineno
|
||
|
|
if self.name is not None:
|
||
|
|
rv += ' in ' + repr(self.name)
|
||
|
|
return rv
|
||
|
|
|
||
|
|
def dump_local_context(self, frame):
|
||
|
|
return '{%s}' % ', '.join(
|
||
|
|
'%r: %s' % (name, target) for name, target
|
||
|
|
in iteritems(frame.symbols.dump_stores()))
|
||
|
|
|
||
|
|
def write_commons(self):
|
||
|
|
"""Writes a common preamble that is used by root and block functions.
|
||
|
|
Primarily this sets up common local helpers and enforces a generator
|
||
|
|
through a dead branch.
|
||
|
|
"""
|
||
|
|
self.writeline('resolve = context.resolve_or_missing')
|
||
|
|
self.writeline('undefined = environment.undefined')
|
||
|
|
self.writeline('if 0: yield None')
|
||
|
|
|
||
|
|
def push_parameter_definitions(self, frame):
|
||
|
|
"""Pushes all parameter targets from the given frame into a local
|
||
|
|
stack that permits tracking of yet to be assigned parameters. In
|
||
|
|
particular this enables the optimization from `visit_Name` to skip
|
||
|
|
undefined expressions for parameters in macros as macros can reference
|
||
|
|
otherwise unbound parameters.
|
||
|
|
"""
|
||
|
|
self._param_def_block.append(frame.symbols.dump_param_targets())
|
||
|
|
|
||
|
|
def pop_parameter_definitions(self):
|
||
|
|
"""Pops the current parameter definitions set."""
|
||
|
|
self._param_def_block.pop()
|
||
|
|
|
||
|
|
def mark_parameter_stored(self, target):
|
||
|
|
"""Marks a parameter in the current parameter definitions as stored.
|
||
|
|
This will skip the enforced undefined checks.
|
||
|
|
"""
|
||
|
|
if self._param_def_block:
|
||
|
|
self._param_def_block[-1].discard(target)
|
||
|
|
|
||
|
|
def parameter_is_undeclared(self, target):
|
||
|
|
"""Checks if a given target is an undeclared parameter."""
|
||
|
|
if not self._param_def_block:
|
||
|
|
return False
|
||
|
|
return target in self._param_def_block[-1]
|
||
|
|
|
||
|
|
def push_assign_tracking(self):
|
||
|
|
"""Pushes a new layer for assignment tracking."""
|
||
|
|
self._assign_stack.append(set())
|
||
|
|
|
||
|
|
def pop_assign_tracking(self, frame):
|
||
|
|
"""Pops the topmost level for assignment tracking and updates the
|
||
|
|
context variables if necessary.
|
||
|
|
"""
|
||
|
|
vars = self._assign_stack.pop()
|
||
|
|
if not frame.toplevel or not vars:
|
||
|
|
return
|
||
|
|
public_names = [x for x in vars if x[:1] != '_']
|
||
|
|
if len(vars) == 1:
|
||
|
|
name = next(iter(vars))
|
||
|
|
ref = frame.symbols.ref(name)
|
||
|
|
self.writeline('context.vars[%r] = %s' % (name, ref))
|
||
|
|
else:
|
||
|
|
self.writeline('context.vars.update({')
|
||
|
|
for idx, name in enumerate(vars):
|
||
|
|
if idx:
|
||
|
|
self.write(', ')
|
||
|
|
ref = frame.symbols.ref(name)
|
||
|
|
self.write('%r: %s' % (name, ref))
|
||
|
|
self.write('})')
|
||
|
|
if public_names:
|
||
|
|
if len(public_names) == 1:
|
||
|
|
self.writeline('context.exported_vars.add(%r)' %
|
||
|
|
public_names[0])
|
||
|
|
else:
|
||
|
|
self.writeline('context.exported_vars.update((%s))' %
|
||
|
|
', '.join(imap(repr, public_names)))
|
||
|
|
|
||
|
|
# -- Statement Visitors
|
||
|
|
|
||
|
|
def visit_Template(self, node, frame=None):
|
||
|
|
assert frame is None, 'no root frame allowed'
|
||
|
|
eval_ctx = EvalContext(self.environment, self.name)
|
||
|
|
|
||
|
|
from jinja2.runtime import __all__ as exported
|
||
|
|
self.writeline('from __future__ import %s' % ', '.join(code_features))
|
||
|
|
self.writeline('from jinja2.runtime import ' + ', '.join(exported))
|
||
|
|
|
||
|
|
if self.environment.is_async:
|
||
|
|
self.writeline('from jinja2.asyncsupport import auto_await, '
|
||
|
|
'auto_aiter, make_async_loop_context')
|
||
|
|
|
||
|
|
# if we want a deferred initialization we cannot move the
|
||
|
|
# environment into a local name
|
||
|
|
envenv = not self.defer_init and ', environment=environment' or ''
|
||
|
|
|
||
|
|
# do we have an extends tag at all? If not, we can save some
|
||
|
|
# overhead by just not processing any inheritance code.
|
||
|
|
have_extends = node.find(nodes.Extends) is not None
|
||
|
|
|
||
|
|
# find all blocks
|
||
|
|
for block in node.find_all(nodes.Block):
|
||
|
|
if block.name in self.blocks:
|
||
|
|
self.fail('block %r defined twice' % block.name, block.lineno)
|
||
|
|
self.blocks[block.name] = block
|
||
|
|
|
||
|
|
# find all imports and import them
|
||
|
|
for import_ in node.find_all(nodes.ImportedName):
|
||
|
|
if import_.importname not in self.import_aliases:
|
||
|
|
imp = import_.importname
|
||
|
|
self.import_aliases[imp] = alias = self.temporary_identifier()
|
||
|
|
if '.' in imp:
|
||
|
|
module, obj = imp.rsplit('.', 1)
|
||
|
|
self.writeline('from %s import %s as %s' %
|
||
|
|
(module, obj, alias))
|
||
|
|
else:
|
||
|
|
self.writeline('import %s as %s' % (imp, alias))
|
||
|
|
|
||
|
|
# add the load name
|
||
|
|
self.writeline('name = %r' % self.name)
|
||
|
|
|
||
|
|
# generate the root render function.
|
||
|
|
self.writeline('%s(context, missing=missing%s):' %
|
||
|
|
(self.func('root'), envenv), extra=1)
|
||
|
|
self.indent()
|
||
|
|
self.write_commons()
|
||
|
|
|
||
|
|
# process the root
|
||
|
|
frame = Frame(eval_ctx)
|
||
|
|
if 'self' in find_undeclared(node.body, ('self',)):
|
||
|
|
ref = frame.symbols.declare_parameter('self')
|
||
|
|
self.writeline('%s = TemplateReference(context)' % ref)
|
||
|
|
frame.symbols.analyze_node(node)
|
||
|
|
frame.toplevel = frame.rootlevel = True
|
||
|
|
frame.require_output_check = have_extends and not self.has_known_extends
|
||
|
|
if have_extends:
|
||
|
|
self.writeline('parent_template = None')
|
||
|
|
self.enter_frame(frame)
|
||
|
|
self.pull_dependencies(node.body)
|
||
|
|
self.blockvisit(node.body, frame)
|
||
|
|
self.leave_frame(frame, with_python_scope=True)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
# make sure that the parent root is called.
|
||
|
|
if have_extends:
|
||
|
|
if not self.has_known_extends:
|
||
|
|
self.indent()
|
||
|
|
self.writeline('if parent_template is not None:')
|
||
|
|
self.indent()
|
||
|
|
if supports_yield_from and not self.environment.is_async:
|
||
|
|
self.writeline('yield from parent_template.'
|
||
|
|
'root_render_func(context)')
|
||
|
|
else:
|
||
|
|
self.writeline('%sfor event in parent_template.'
|
||
|
|
'root_render_func(context):' %
|
||
|
|
(self.environment.is_async and 'async ' or ''))
|
||
|
|
self.indent()
|
||
|
|
self.writeline('yield event')
|
||
|
|
self.outdent()
|
||
|
|
self.outdent(1 + (not self.has_known_extends))
|
||
|
|
|
||
|
|
# at this point we now have the blocks collected and can visit them too.
|
||
|
|
for name, block in iteritems(self.blocks):
|
||
|
|
self.writeline('%s(context, missing=missing%s):' %
|
||
|
|
(self.func('block_' + name), envenv),
|
||
|
|
block, 1)
|
||
|
|
self.indent()
|
||
|
|
self.write_commons()
|
||
|
|
# It's important that we do not make this frame a child of the
|
||
|
|
# toplevel template. This would cause a variety of
|
||
|
|
# interesting issues with identifier tracking.
|
||
|
|
block_frame = Frame(eval_ctx)
|
||
|
|
undeclared = find_undeclared(block.body, ('self', 'super'))
|
||
|
|
if 'self' in undeclared:
|
||
|
|
ref = block_frame.symbols.declare_parameter('self')
|
||
|
|
self.writeline('%s = TemplateReference(context)' % ref)
|
||
|
|
if 'super' in undeclared:
|
||
|
|
ref = block_frame.symbols.declare_parameter('super')
|
||
|
|
self.writeline('%s = context.super(%r, '
|
||
|
|
'block_%s)' % (ref, name, name))
|
||
|
|
block_frame.symbols.analyze_node(block)
|
||
|
|
block_frame.block = name
|
||
|
|
self.enter_frame(block_frame)
|
||
|
|
self.pull_dependencies(block.body)
|
||
|
|
self.blockvisit(block.body, block_frame)
|
||
|
|
self.leave_frame(block_frame, with_python_scope=True)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
self.writeline('blocks = {%s}' % ', '.join('%r: block_%s' % (x, x)
|
||
|
|
for x in self.blocks),
|
||
|
|
extra=1)
|
||
|
|
|
||
|
|
# add a function that returns the debug info
|
||
|
|
self.writeline('debug_info = %r' % '&'.join('%s=%s' % x for x
|
||
|
|
in self.debug_info))
|
||
|
|
|
||
|
|
def visit_Block(self, node, frame):
|
||
|
|
"""Call a block and register it for the template."""
|
||
|
|
level = 0
|
||
|
|
if frame.toplevel:
|
||
|
|
# if we know that we are a child template, there is no need to
|
||
|
|
# check if we are one
|
||
|
|
if self.has_known_extends:
|
||
|
|
return
|
||
|
|
if self.extends_so_far > 0:
|
||
|
|
self.writeline('if parent_template is None:')
|
||
|
|
self.indent()
|
||
|
|
level += 1
|
||
|
|
context = node.scoped and (
|
||
|
|
'context.derived(%s)' % self.dump_local_context(frame)) or 'context'
|
||
|
|
|
||
|
|
if supports_yield_from and not self.environment.is_async and \
|
||
|
|
frame.buffer is None:
|
||
|
|
self.writeline('yield from context.blocks[%r][0](%s)' % (
|
||
|
|
node.name, context), node)
|
||
|
|
else:
|
||
|
|
loop = self.environment.is_async and 'async for' or 'for'
|
||
|
|
self.writeline('%s event in context.blocks[%r][0](%s):' % (
|
||
|
|
loop, node.name, context), node)
|
||
|
|
self.indent()
|
||
|
|
self.simple_write('event', frame)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
self.outdent(level)
|
||
|
|
|
||
|
|
def visit_Extends(self, node, frame):
|
||
|
|
"""Calls the extender."""
|
||
|
|
if not frame.toplevel:
|
||
|
|
self.fail('cannot use extend from a non top-level scope',
|
||
|
|
node.lineno)
|
||
|
|
|
||
|
|
# if the number of extends statements in general is zero so
|
||
|
|
# far, we don't have to add a check if something extended
|
||
|
|
# the template before this one.
|
||
|
|
if self.extends_so_far > 0:
|
||
|
|
|
||
|
|
# if we have a known extends we just add a template runtime
|
||
|
|
# error into the generated code. We could catch that at compile
|
||
|
|
# time too, but i welcome it not to confuse users by throwing the
|
||
|
|
# same error at different times just "because we can".
|
||
|
|
if not self.has_known_extends:
|
||
|
|
self.writeline('if parent_template is not None:')
|
||
|
|
self.indent()
|
||
|
|
self.writeline('raise TemplateRuntimeError(%r)' %
|
||
|
|
'extended multiple times')
|
||
|
|
|
||
|
|
# if we have a known extends already we don't need that code here
|
||
|
|
# as we know that the template execution will end here.
|
||
|
|
if self.has_known_extends:
|
||
|
|
raise CompilerExit()
|
||
|
|
else:
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
self.writeline('parent_template = environment.get_template(', node)
|
||
|
|
self.visit(node.template, frame)
|
||
|
|
self.write(', %r)' % self.name)
|
||
|
|
self.writeline('for name, parent_block in parent_template.'
|
||
|
|
'blocks.%s():' % dict_item_iter)
|
||
|
|
self.indent()
|
||
|
|
self.writeline('context.blocks.setdefault(name, []).'
|
||
|
|
'append(parent_block)')
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
# if this extends statement was in the root level we can take
|
||
|
|
# advantage of that information and simplify the generated code
|
||
|
|
# in the top level from this point onwards
|
||
|
|
if frame.rootlevel:
|
||
|
|
self.has_known_extends = True
|
||
|
|
|
||
|
|
# and now we have one more
|
||
|
|
self.extends_so_far += 1
|
||
|
|
|
||
|
|
def visit_Include(self, node, frame):
|
||
|
|
"""Handles includes."""
|
||
|
|
if node.ignore_missing:
|
||
|
|
self.writeline('try:')
|
||
|
|
self.indent()
|
||
|
|
|
||
|
|
func_name = 'get_or_select_template'
|
||
|
|
if isinstance(node.template, nodes.Const):
|
||
|
|
if isinstance(node.template.value, string_types):
|
||
|
|
func_name = 'get_template'
|
||
|
|
elif isinstance(node.template.value, (tuple, list)):
|
||
|
|
func_name = 'select_template'
|
||
|
|
elif isinstance(node.template, (nodes.Tuple, nodes.List)):
|
||
|
|
func_name = 'select_template'
|
||
|
|
|
||
|
|
self.writeline('template = environment.%s(' % func_name, node)
|
||
|
|
self.visit(node.template, frame)
|
||
|
|
self.write(', %r)' % self.name)
|
||
|
|
if node.ignore_missing:
|
||
|
|
self.outdent()
|
||
|
|
self.writeline('except TemplateNotFound:')
|
||
|
|
self.indent()
|
||
|
|
self.writeline('pass')
|
||
|
|
self.outdent()
|
||
|
|
self.writeline('else:')
|
||
|
|
self.indent()
|
||
|
|
|
||
|
|
skip_event_yield = False
|
||
|
|
if node.with_context:
|
||
|
|
loop = self.environment.is_async and 'async for' or 'for'
|
||
|
|
self.writeline('%s event in template.root_render_func('
|
||
|
|
'template.new_context(context.get_all(), True, '
|
||
|
|
'%s)):' % (loop, self.dump_local_context(frame)))
|
||
|
|
elif self.environment.is_async:
|
||
|
|
self.writeline('for event in (await '
|
||
|
|
'template._get_default_module_async())'
|
||
|
|
'._body_stream:')
|
||
|
|
else:
|
||
|
|
if supports_yield_from:
|
||
|
|
self.writeline('yield from template._get_default_module()'
|
||
|
|
'._body_stream')
|
||
|
|
skip_event_yield = True
|
||
|
|
else:
|
||
|
|
self.writeline('for event in template._get_default_module()'
|
||
|
|
'._body_stream:')
|
||
|
|
|
||
|
|
if not skip_event_yield:
|
||
|
|
self.indent()
|
||
|
|
self.simple_write('event', frame)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
if node.ignore_missing:
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
def visit_Import(self, node, frame):
|
||
|
|
"""Visit regular imports."""
|
||
|
|
self.writeline('%s = ' % frame.symbols.ref(node.target), node)
|
||
|
|
if frame.toplevel:
|
||
|
|
self.write('context.vars[%r] = ' % node.target)
|
||
|
|
if self.environment.is_async:
|
||
|
|
self.write('await ')
|
||
|
|
self.write('environment.get_template(')
|
||
|
|
self.visit(node.template, frame)
|
||
|
|
self.write(', %r).' % self.name)
|
||
|
|
if node.with_context:
|
||
|
|
self.write('make_module%s(context.get_all(), True, %s)'
|
||
|
|
% (self.environment.is_async and '_async' or '',
|
||
|
|
self.dump_local_context(frame)))
|
||
|
|
elif self.environment.is_async:
|
||
|
|
self.write('_get_default_module_async()')
|
||
|
|
else:
|
||
|
|
self.write('_get_default_module()')
|
||
|
|
if frame.toplevel and not node.target.startswith('_'):
|
||
|
|
self.writeline('context.exported_vars.discard(%r)' % node.target)
|
||
|
|
|
||
|
|
def visit_FromImport(self, node, frame):
|
||
|
|
"""Visit named imports."""
|
||
|
|
self.newline(node)
|
||
|
|
self.write('included_template = %senvironment.get_template('
|
||
|
|
% (self.environment.is_async and 'await ' or ''))
|
||
|
|
self.visit(node.template, frame)
|
||
|
|
self.write(', %r).' % self.name)
|
||
|
|
if node.with_context:
|
||
|
|
self.write('make_module%s(context.get_all(), True, %s)'
|
||
|
|
% (self.environment.is_async and '_async' or '',
|
||
|
|
self.dump_local_context(frame)))
|
||
|
|
elif self.environment.is_async:
|
||
|
|
self.write('_get_default_module_async()')
|
||
|
|
else:
|
||
|
|
self.write('_get_default_module()')
|
||
|
|
|
||
|
|
var_names = []
|
||
|
|
discarded_names = []
|
||
|
|
for name in node.names:
|
||
|
|
if isinstance(name, tuple):
|
||
|
|
name, alias = name
|
||
|
|
else:
|
||
|
|
alias = name
|
||
|
|
self.writeline('%s = getattr(included_template, '
|
||
|
|
'%r, missing)' % (frame.symbols.ref(alias), name))
|
||
|
|
self.writeline('if %s is missing:' % frame.symbols.ref(alias))
|
||
|
|
self.indent()
|
||
|
|
self.writeline('%s = undefined(%r %% '
|
||
|
|
'included_template.__name__, '
|
||
|
|
'name=%r)' %
|
||
|
|
(frame.symbols.ref(alias),
|
||
|
|
'the template %%r (imported on %s) does '
|
||
|
|
'not export the requested name %s' % (
|
||
|
|
self.position(node),
|
||
|
|
repr(name)
|
||
|
|
), name))
|
||
|
|
self.outdent()
|
||
|
|
if frame.toplevel:
|
||
|
|
var_names.append(alias)
|
||
|
|
if not alias.startswith('_'):
|
||
|
|
discarded_names.append(alias)
|
||
|
|
|
||
|
|
if var_names:
|
||
|
|
if len(var_names) == 1:
|
||
|
|
name = var_names[0]
|
||
|
|
self.writeline('context.vars[%r] = %s' %
|
||
|
|
(name, frame.symbols.ref(name)))
|
||
|
|
else:
|
||
|
|
self.writeline('context.vars.update({%s})' % ', '.join(
|
||
|
|
'%r: %s' % (name, frame.symbols.ref(name)) for name in var_names
|
||
|
|
))
|
||
|
|
if discarded_names:
|
||
|
|
if len(discarded_names) == 1:
|
||
|
|
self.writeline('context.exported_vars.discard(%r)' %
|
||
|
|
discarded_names[0])
|
||
|
|
else:
|
||
|
|
self.writeline('context.exported_vars.difference_'
|
||
|
|
'update((%s))' % ', '.join(imap(repr, discarded_names)))
|
||
|
|
|
||
|
|
def visit_For(self, node, frame):
|
||
|
|
loop_frame = frame.inner()
|
||
|
|
test_frame = frame.inner()
|
||
|
|
else_frame = frame.inner()
|
||
|
|
|
||
|
|
# try to figure out if we have an extended loop. An extended loop
|
||
|
|
# is necessary if the loop is in recursive mode if the special loop
|
||
|
|
# variable is accessed in the body.
|
||
|
|
extended_loop = node.recursive or 'loop' in \
|
||
|
|
find_undeclared(node.iter_child_nodes(
|
||
|
|
only=('body',)), ('loop',))
|
||
|
|
|
||
|
|
loop_ref = None
|
||
|
|
if extended_loop:
|
||
|
|
loop_ref = loop_frame.symbols.declare_parameter('loop')
|
||
|
|
|
||
|
|
loop_frame.symbols.analyze_node(node, for_branch='body')
|
||
|
|
if node.else_:
|
||
|
|
else_frame.symbols.analyze_node(node, for_branch='else')
|
||
|
|
|
||
|
|
if node.test:
|
||
|
|
loop_filter_func = self.temporary_identifier()
|
||
|
|
test_frame.symbols.analyze_node(node, for_branch='test')
|
||
|
|
self.writeline('%s(fiter):' % self.func(loop_filter_func), node.test)
|
||
|
|
self.indent()
|
||
|
|
self.enter_frame(test_frame)
|
||
|
|
self.writeline(self.environment.is_async and 'async for ' or 'for ')
|
||
|
|
self.visit(node.target, loop_frame)
|
||
|
|
self.write(' in ')
|
||
|
|
self.write(self.environment.is_async and 'auto_aiter(fiter)' or 'fiter')
|
||
|
|
self.write(':')
|
||
|
|
self.indent()
|
||
|
|
self.writeline('if ', node.test)
|
||
|
|
self.visit(node.test, test_frame)
|
||
|
|
self.write(':')
|
||
|
|
self.indent()
|
||
|
|
self.writeline('yield ')
|
||
|
|
self.visit(node.target, loop_frame)
|
||
|
|
self.outdent(3)
|
||
|
|
self.leave_frame(test_frame, with_python_scope=True)
|
||
|
|
|
||
|
|
# if we don't have an recursive loop we have to find the shadowed
|
||
|
|
# variables at that point. Because loops can be nested but the loop
|
||
|
|
# variable is a special one we have to enforce aliasing for it.
|
||
|
|
if node.recursive:
|
||
|
|
self.writeline('%s(reciter, loop_render_func, depth=0):' %
|
||
|
|
self.func('loop'), node)
|
||
|
|
self.indent()
|
||
|
|
self.buffer(loop_frame)
|
||
|
|
|
||
|
|
# Use the same buffer for the else frame
|
||
|
|
else_frame.buffer = loop_frame.buffer
|
||
|
|
|
||
|
|
# make sure the loop variable is a special one and raise a template
|
||
|
|
# assertion error if a loop tries to write to loop
|
||
|
|
if extended_loop:
|
||
|
|
self.writeline('%s = missing' % loop_ref)
|
||
|
|
|
||
|
|
for name in node.find_all(nodes.Name):
|
||
|
|
if name.ctx == 'store' and name.name == 'loop':
|
||
|
|
self.fail('Can\'t assign to special loop variable '
|
||
|
|
'in for-loop target', name.lineno)
|
||
|
|
|
||
|
|
if node.else_:
|
||
|
|
iteration_indicator = self.temporary_identifier()
|
||
|
|
self.writeline('%s = 1' % iteration_indicator)
|
||
|
|
|
||
|
|
self.writeline(self.environment.is_async and 'async for ' or 'for ', node)
|
||
|
|
self.visit(node.target, loop_frame)
|
||
|
|
if extended_loop:
|
||
|
|
if self.environment.is_async:
|
||
|
|
self.write(', %s in await make_async_loop_context(' % loop_ref)
|
||
|
|
else:
|
||
|
|
self.write(', %s in LoopContext(' % loop_ref)
|
||
|
|
else:
|
||
|
|
self.write(' in ')
|
||
|
|
|
||
|
|
if node.test:
|
||
|
|
self.write('%s(' % loop_filter_func)
|
||
|
|
if node.recursive:
|
||
|
|
self.write('reciter')
|
||
|
|
else:
|
||
|
|
if self.environment.is_async and not extended_loop:
|
||
|
|
self.write('auto_aiter(')
|
||
|
|
self.visit(node.iter, frame)
|
||
|
|
if self.environment.is_async and not extended_loop:
|
||
|
|
self.write(')')
|
||
|
|
if node.test:
|
||
|
|
self.write(')')
|
||
|
|
|
||
|
|
if node.recursive:
|
||
|
|
self.write(', loop_render_func, depth):')
|
||
|
|
else:
|
||
|
|
self.write(extended_loop and '):' 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()
|
||
|
|
if node.else_:
|
||
|
|
self.writeline('else:')
|
||
|
|
self.indent()
|
||
|
|
self.blockvisit(node.else_, if_frame)
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
def visit_Macro(self, node, frame):
|
||
|
|
macro_frame, macro_ref = self.macro_body(node, frame)
|
||
|
|
self.newline()
|
||
|
|
if frame.toplevel:
|
||
|
|
if not node.name.startswith('_'):
|
||
|
|
self.write('context.exported_vars.add(%r)' % node.name)
|
||
|
|
ref = frame.symbols.ref(node.name)
|
||
|
|
self.writeline('context.vars[%r] = ' % node.name)
|
||
|
|
self.write('%s = ' % frame.symbols.ref(node.name))
|
||
|
|
self.macro_def(macro_ref, macro_frame)
|
||
|
|
|
||
|
|
def visit_CallBlock(self, node, frame):
|
||
|
|
call_frame, macro_ref = self.macro_body(node, frame)
|
||
|
|
self.writeline('caller = ')
|
||
|
|
self.macro_def(macro_ref, call_frame)
|
||
|
|
self.start_write(frame, node)
|
||
|
|
self.visit_Call(node.call, frame, forward_caller=True)
|
||
|
|
self.end_write(frame)
|
||
|
|
|
||
|
|
def visit_FilterBlock(self, node, frame):
|
||
|
|
filter_frame = frame.inner()
|
||
|
|
filter_frame.symbols.analyze_node(node)
|
||
|
|
self.enter_frame(filter_frame)
|
||
|
|
self.buffer(filter_frame)
|
||
|
|
self.blockvisit(node.body, filter_frame)
|
||
|
|
self.start_write(frame, node)
|
||
|
|
self.visit_Filter(node.filter, filter_frame)
|
||
|
|
self.end_write(frame)
|
||
|
|
self.leave_frame(filter_frame)
|
||
|
|
|
||
|
|
def visit_With(self, node, frame):
|
||
|
|
with_frame = frame.inner()
|
||
|
|
with_frame.symbols.analyze_node(node)
|
||
|
|
self.enter_frame(with_frame)
|
||
|
|
for idx, (target, expr) in enumerate(izip(node.targets, node.values)):
|
||
|
|
self.newline()
|
||
|
|
self.visit(target, with_frame)
|
||
|
|
self.write(' = ')
|
||
|
|
self.visit(expr, frame)
|
||
|
|
self.blockvisit(node.body, with_frame)
|
||
|
|
self.leave_frame(with_frame)
|
||
|
|
|
||
|
|
def visit_ExprStmt(self, node, frame):
|
||
|
|
self.newline(node)
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
|
||
|
|
def visit_Output(self, node, frame):
|
||
|
|
# if we have a known extends statement, we don't output anything
|
||
|
|
# if we are in a require_output_check section
|
||
|
|
if self.has_known_extends and frame.require_output_check:
|
||
|
|
return
|
||
|
|
|
||
|
|
allow_constant_finalize = True
|
||
|
|
if self.environment.finalize:
|
||
|
|
func = self.environment.finalize
|
||
|
|
if getattr(func, 'contextfunction', False) or \
|
||
|
|
getattr(func, 'evalcontextfunction', False):
|
||
|
|
allow_constant_finalize = False
|
||
|
|
elif getattr(func, 'environmentfunction', False):
|
||
|
|
finalize = lambda x: text_type(
|
||
|
|
self.environment.finalize(self.environment, x))
|
||
|
|
else:
|
||
|
|
finalize = lambda x: text_type(self.environment.finalize(x))
|
||
|
|
else:
|
||
|
|
finalize = text_type
|
||
|
|
|
||
|
|
# if we are inside a frame that requires output checking, we do so
|
||
|
|
outdent_later = False
|
||
|
|
if frame.require_output_check:
|
||
|
|
self.writeline('if parent_template is None:')
|
||
|
|
self.indent()
|
||
|
|
outdent_later = True
|
||
|
|
|
||
|
|
# try to evaluate as many chunks as possible into a static
|
||
|
|
# string at compile time.
|
||
|
|
body = []
|
||
|
|
for child in node.nodes:
|
||
|
|
try:
|
||
|
|
if not allow_constant_finalize:
|
||
|
|
raise nodes.Impossible()
|
||
|
|
const = child.as_const(frame.eval_ctx)
|
||
|
|
except nodes.Impossible:
|
||
|
|
body.append(child)
|
||
|
|
continue
|
||
|
|
# the frame can't be volatile here, becaus otherwise the
|
||
|
|
# as_const() function would raise an Impossible exception
|
||
|
|
# at that point.
|
||
|
|
try:
|
||
|
|
if frame.eval_ctx.autoescape:
|
||
|
|
if hasattr(const, '__html__'):
|
||
|
|
const = const.__html__()
|
||
|
|
else:
|
||
|
|
const = escape(const)
|
||
|
|
const = finalize(const)
|
||
|
|
except Exception:
|
||
|
|
# if something goes wrong here we evaluate the node
|
||
|
|
# at runtime for easier debugging
|
||
|
|
body.append(child)
|
||
|
|
continue
|
||
|
|
if body and isinstance(body[-1], list):
|
||
|
|
body[-1].append(const)
|
||
|
|
else:
|
||
|
|
body.append([const])
|
||
|
|
|
||
|
|
# if we have less than 3 nodes or a buffer we yield or extend/append
|
||
|
|
if len(body) < 3 or frame.buffer is not None:
|
||
|
|
if frame.buffer is not None:
|
||
|
|
# for one item we append, for more we extend
|
||
|
|
if len(body) == 1:
|
||
|
|
self.writeline('%s.append(' % frame.buffer)
|
||
|
|
else:
|
||
|
|
self.writeline('%s.extend((' % frame.buffer)
|
||
|
|
self.indent()
|
||
|
|
for item in body:
|
||
|
|
if isinstance(item, list):
|
||
|
|
val = repr(concat(item))
|
||
|
|
if frame.buffer is None:
|
||
|
|
self.writeline('yield ' + val)
|
||
|
|
else:
|
||
|
|
self.writeline(val + ',')
|
||
|
|
else:
|
||
|
|
if frame.buffer is None:
|
||
|
|
self.writeline('yield ', item)
|
||
|
|
else:
|
||
|
|
self.newline(item)
|
||
|
|
close = 1
|
||
|
|
if frame.eval_ctx.volatile:
|
||
|
|
self.write('(escape if context.eval_ctx.autoescape'
|
||
|
|
' else to_string)(')
|
||
|
|
elif frame.eval_ctx.autoescape:
|
||
|
|
self.write('escape(')
|
||
|
|
else:
|
||
|
|
self.write('to_string(')
|
||
|
|
if self.environment.finalize is not None:
|
||
|
|
self.write('environment.finalize(')
|
||
|
|
if getattr(self.environment.finalize,
|
||
|
|
"contextfunction", False):
|
||
|
|
self.write('context, ')
|
||
|
|
close += 1
|
||
|
|
self.visit(item, frame)
|
||
|
|
self.write(')' * close)
|
||
|
|
if frame.buffer is not None:
|
||
|
|
self.write(',')
|
||
|
|
if frame.buffer is not None:
|
||
|
|
# close the open parentheses
|
||
|
|
self.outdent()
|
||
|
|
self.writeline(len(body) == 1 and ')' or '))')
|
||
|
|
|
||
|
|
# otherwise we create a format string as this is faster in that case
|
||
|
|
else:
|
||
|
|
format = []
|
||
|
|
arguments = []
|
||
|
|
for item in body:
|
||
|
|
if isinstance(item, list):
|
||
|
|
format.append(concat(item).replace('%', '%%'))
|
||
|
|
else:
|
||
|
|
format.append('%s')
|
||
|
|
arguments.append(item)
|
||
|
|
self.writeline('yield ')
|
||
|
|
self.write(repr(concat(format)) + ' % (')
|
||
|
|
self.indent()
|
||
|
|
for argument in arguments:
|
||
|
|
self.newline(argument)
|
||
|
|
close = 0
|
||
|
|
if frame.eval_ctx.volatile:
|
||
|
|
self.write('(escape if context.eval_ctx.autoescape else'
|
||
|
|
' to_string)(')
|
||
|
|
close += 1
|
||
|
|
elif frame.eval_ctx.autoescape:
|
||
|
|
self.write('escape(')
|
||
|
|
close += 1
|
||
|
|
if self.environment.finalize is not None:
|
||
|
|
self.write('environment.finalize(')
|
||
|
|
if getattr(self.environment.finalize,
|
||
|
|
'contextfunction', False):
|
||
|
|
self.write('context, ')
|
||
|
|
elif getattr(self.environment.finalize,
|
||
|
|
'evalcontextfunction', False):
|
||
|
|
self.write('context.eval_ctx, ')
|
||
|
|
elif getattr(self.environment.finalize,
|
||
|
|
'environmentfunction', False):
|
||
|
|
self.write('environment, ')
|
||
|
|
close += 1
|
||
|
|
self.visit(argument, frame)
|
||
|
|
self.write(')' * close + ', ')
|
||
|
|
self.outdent()
|
||
|
|
self.writeline(')')
|
||
|
|
|
||
|
|
if outdent_later:
|
||
|
|
self.outdent()
|
||
|
|
|
||
|
|
def visit_Assign(self, node, frame):
|
||
|
|
self.push_assign_tracking()
|
||
|
|
self.newline(node)
|
||
|
|
self.visit(node.target, frame)
|
||
|
|
self.write(' = ')
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
self.pop_assign_tracking(frame)
|
||
|
|
|
||
|
|
def visit_AssignBlock(self, node, frame):
|
||
|
|
self.push_assign_tracking()
|
||
|
|
block_frame = frame.inner()
|
||
|
|
# This is a special case. Since a set block always captures we
|
||
|
|
# will disable output checks. This way one can use set blocks
|
||
|
|
# toplevel even in extended templates.
|
||
|
|
block_frame.require_output_check = False
|
||
|
|
block_frame.symbols.analyze_node(node)
|
||
|
|
self.enter_frame(block_frame)
|
||
|
|
self.buffer(block_frame)
|
||
|
|
self.blockvisit(node.body, block_frame)
|
||
|
|
self.newline(node)
|
||
|
|
self.visit(node.target, frame)
|
||
|
|
self.write(' = (Markup if context.eval_ctx.autoescape '
|
||
|
|
'else identity)(concat(%s))' % block_frame.buffer)
|
||
|
|
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_Const(self, node, frame):
|
||
|
|
val = node.as_const(frame.eval_ctx)
|
||
|
|
if isinstance(val, float):
|
||
|
|
self.write(str(val))
|
||
|
|
else:
|
||
|
|
self.write(repr(val))
|
||
|
|
|
||
|
|
def visit_TemplateData(self, node, frame):
|
||
|
|
try:
|
||
|
|
self.write(repr(node.as_const(frame.eval_ctx)))
|
||
|
|
except nodes.Impossible:
|
||
|
|
self.write('(Markup if context.eval_ctx.autoescape else identity)(%r)'
|
||
|
|
% node.data)
|
||
|
|
|
||
|
|
def visit_Tuple(self, node, frame):
|
||
|
|
self.write('(')
|
||
|
|
idx = -1
|
||
|
|
for idx, item in enumerate(node.items):
|
||
|
|
if idx:
|
||
|
|
self.write(', ')
|
||
|
|
self.visit(item, frame)
|
||
|
|
self.write(idx == 0 and ',)' or ')')
|
||
|
|
|
||
|
|
def visit_List(self, node, frame):
|
||
|
|
self.write('[')
|
||
|
|
for idx, item in enumerate(node.items):
|
||
|
|
if idx:
|
||
|
|
self.write(', ')
|
||
|
|
self.visit(item, frame)
|
||
|
|
self.write(']')
|
||
|
|
|
||
|
|
def visit_Dict(self, node, frame):
|
||
|
|
self.write('{')
|
||
|
|
for idx, item in enumerate(node.items):
|
||
|
|
if idx:
|
||
|
|
self.write(', ')
|
||
|
|
self.visit(item.key, frame)
|
||
|
|
self.write(': ')
|
||
|
|
self.visit(item.value, frame)
|
||
|
|
self.write('}')
|
||
|
|
|
||
|
|
def binop(operator, interceptable=True):
|
||
|
|
@optimizeconst
|
||
|
|
def visitor(self, node, frame):
|
||
|
|
if self.environment.sandboxed and \
|
||
|
|
operator in self.environment.intercepted_binops:
|
||
|
|
self.write('environment.call_binop(context, %r, ' % operator)
|
||
|
|
self.visit(node.left, frame)
|
||
|
|
self.write(', ')
|
||
|
|
self.visit(node.right, frame)
|
||
|
|
else:
|
||
|
|
self.write('(')
|
||
|
|
self.visit(node.left, frame)
|
||
|
|
self.write(' %s ' % operator)
|
||
|
|
self.visit(node.right, frame)
|
||
|
|
self.write(')')
|
||
|
|
return visitor
|
||
|
|
|
||
|
|
def uaop(operator, interceptable=True):
|
||
|
|
@optimizeconst
|
||
|
|
def visitor(self, node, frame):
|
||
|
|
if self.environment.sandboxed and \
|
||
|
|
operator in self.environment.intercepted_unops:
|
||
|
|
self.write('environment.call_unop(context, %r, ' % operator)
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
else:
|
||
|
|
self.write('(' + operator)
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
self.write(')')
|
||
|
|
return visitor
|
||
|
|
|
||
|
|
visit_Add = binop('+')
|
||
|
|
visit_Sub = binop('-')
|
||
|
|
visit_Mul = binop('*')
|
||
|
|
visit_Div = binop('/')
|
||
|
|
visit_FloorDiv = binop('//')
|
||
|
|
visit_Pow = binop('**')
|
||
|
|
visit_Mod = binop('%')
|
||
|
|
visit_And = binop('and', interceptable=False)
|
||
|
|
visit_Or = binop('or', interceptable=False)
|
||
|
|
visit_Pos = uaop('+')
|
||
|
|
visit_Neg = uaop('-')
|
||
|
|
visit_Not = uaop('not ', interceptable=False)
|
||
|
|
del binop, uaop
|
||
|
|
|
||
|
|
@optimizeconst
|
||
|
|
def visit_Concat(self, node, frame):
|
||
|
|
if frame.eval_ctx.volatile:
|
||
|
|
func_name = '(context.eval_ctx.volatile and' \
|
||
|
|
' markup_join or unicode_join)'
|
||
|
|
elif frame.eval_ctx.autoescape:
|
||
|
|
func_name = 'markup_join'
|
||
|
|
else:
|
||
|
|
func_name = 'unicode_join'
|
||
|
|
self.write('%s((' % func_name)
|
||
|
|
for arg in node.nodes:
|
||
|
|
self.visit(arg, frame)
|
||
|
|
self.write(', ')
|
||
|
|
self.write('))')
|
||
|
|
|
||
|
|
@optimizeconst
|
||
|
|
def visit_Compare(self, node, frame):
|
||
|
|
self.visit(node.expr, frame)
|
||
|
|
for op in node.ops:
|
||
|
|
self.visit(op, frame)
|
||
|
|
|
||
|
|
def visit_Operand(self, node, frame):
|
||
|
|
self.write(' %s ' % operators[node.op])
|
||
|
|
self.visit(node.expr, frame)
|
||
|
|
|
||
|
|
@optimizeconst
|
||
|
|
def visit_Getattr(self, node, frame):
|
||
|
|
self.write('environment.getattr(')
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
self.write(', %r)' % node.attr)
|
||
|
|
|
||
|
|
@optimizeconst
|
||
|
|
def visit_Getitem(self, node, frame):
|
||
|
|
# slices bypass the environment getitem method.
|
||
|
|
if isinstance(node.arg, nodes.Slice):
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
self.write('[')
|
||
|
|
self.visit(node.arg, frame)
|
||
|
|
self.write(']')
|
||
|
|
else:
|
||
|
|
self.write('environment.getitem(')
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
self.write(', ')
|
||
|
|
self.visit(node.arg, frame)
|
||
|
|
self.write(')')
|
||
|
|
|
||
|
|
def visit_Slice(self, node, frame):
|
||
|
|
if node.start is not None:
|
||
|
|
self.visit(node.start, frame)
|
||
|
|
self.write(':')
|
||
|
|
if node.stop is not None:
|
||
|
|
self.visit(node.stop, frame)
|
||
|
|
if node.step is not None:
|
||
|
|
self.write(':')
|
||
|
|
self.visit(node.step, frame)
|
||
|
|
|
||
|
|
@optimizeconst
|
||
|
|
def visit_Filter(self, node, frame):
|
||
|
|
if self.environment.is_async:
|
||
|
|
self.write('await auto_await(')
|
||
|
|
self.write(self.filters[node.name] + '(')
|
||
|
|
func = self.environment.filters.get(node.name)
|
||
|
|
if func is None:
|
||
|
|
self.fail('no filter named %r' % node.name, node.lineno)
|
||
|
|
if getattr(func, 'contextfilter', False):
|
||
|
|
self.write('context, ')
|
||
|
|
elif getattr(func, 'evalcontextfilter', False):
|
||
|
|
self.write('context.eval_ctx, ')
|
||
|
|
elif getattr(func, 'environmentfilter', False):
|
||
|
|
self.write('environment, ')
|
||
|
|
|
||
|
|
# if the filter node is None we are inside a filter block
|
||
|
|
# and want to write to the current buffer
|
||
|
|
if node.node is not None:
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
elif frame.eval_ctx.volatile:
|
||
|
|
self.write('(context.eval_ctx.autoescape and'
|
||
|
|
' Markup(concat(%s)) or concat(%s))' %
|
||
|
|
(frame.buffer, frame.buffer))
|
||
|
|
elif frame.eval_ctx.autoescape:
|
||
|
|
self.write('Markup(concat(%s))' % frame.buffer)
|
||
|
|
else:
|
||
|
|
self.write('concat(%s)' % frame.buffer)
|
||
|
|
self.signature(node, frame)
|
||
|
|
self.write(')')
|
||
|
|
if self.environment.is_async:
|
||
|
|
self.write(')')
|
||
|
|
|
||
|
|
@optimizeconst
|
||
|
|
def visit_Test(self, node, frame):
|
||
|
|
self.write(self.tests[node.name] + '(')
|
||
|
|
if node.name not in self.environment.tests:
|
||
|
|
self.fail('no test named %r' % node.name, node.lineno)
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
self.signature(node, frame)
|
||
|
|
self.write(')')
|
||
|
|
|
||
|
|
@optimizeconst
|
||
|
|
def visit_CondExpr(self, node, frame):
|
||
|
|
def write_expr2():
|
||
|
|
if node.expr2 is not None:
|
||
|
|
return self.visit(node.expr2, frame)
|
||
|
|
self.write('undefined(%r)' % ('the inline if-'
|
||
|
|
'expression on %s evaluated to false and '
|
||
|
|
'no else section was defined.' % self.position(node)))
|
||
|
|
|
||
|
|
self.write('(')
|
||
|
|
self.visit(node.expr1, frame)
|
||
|
|
self.write(' if ')
|
||
|
|
self.visit(node.test, frame)
|
||
|
|
self.write(' else ')
|
||
|
|
write_expr2()
|
||
|
|
self.write(')')
|
||
|
|
|
||
|
|
@optimizeconst
|
||
|
|
def visit_Call(self, node, frame, forward_caller=False):
|
||
|
|
if self.environment.is_async:
|
||
|
|
self.write('await auto_await(')
|
||
|
|
if self.environment.sandboxed:
|
||
|
|
self.write('environment.call(context, ')
|
||
|
|
else:
|
||
|
|
self.write('context.call(')
|
||
|
|
self.visit(node.node, frame)
|
||
|
|
extra_kwargs = forward_caller and {'caller': 'caller'} or None
|
||
|
|
self.signature(node, frame, extra_kwargs)
|
||
|
|
self.write(')')
|
||
|
|
if self.environment.is_async:
|
||
|
|
self.write(')')
|
||
|
|
|
||
|
|
def visit_Keyword(self, node, frame):
|
||
|
|
self.write(node.key + '=')
|
||
|
|
self.visit(node.value, frame)
|
||
|
|
|
||
|
|
# -- Unused nodes for extensions
|
||
|
|
|
||
|
|
def visit_MarkSafe(self, node, frame):
|
||
|
|
self.write('Markup(')
|
||
|
|
self.visit(node.expr, frame)
|
||
|
|
self.write(')')
|
||
|
|
|
||
|
|
def visit_MarkSafeIfAutoescape(self, node, frame):
|
||
|
|
self.write('(context.eval_ctx.autoescape and Markup or identity)(')
|
||
|
|
self.visit(node.expr, frame)
|
||
|
|
self.write(')')
|
||
|
|
|
||
|
|
def visit_EnvironmentAttribute(self, node, frame):
|
||
|
|
self.write('environment.' + node.name)
|
||
|
|
|
||
|
|
def visit_ExtensionAttribute(self, node, frame):
|
||
|
|
self.write('environment.extensions[%r].%s' % (node.identifier, node.name))
|
||
|
|
|
||
|
|
def visit_ImportedName(self, node, frame):
|
||
|
|
self.write(self.import_aliases[node.importname])
|
||
|
|
|
||
|
|
def visit_InternalName(self, node, frame):
|
||
|
|
self.write(node.name)
|
||
|
|
|
||
|
|
def visit_ContextReference(self, node, frame):
|
||
|
|
self.write('context')
|
||
|
|
|
||
|
|
def visit_Continue(self, node, frame):
|
||
|
|
self.writeline('continue', node)
|
||
|
|
|
||
|
|
def visit_Break(self, node, frame):
|
||
|
|
self.writeline('break', node)
|
||
|
|
|
||
|
|
def visit_Scope(self, node, frame):
|
||
|
|
scope_frame = frame.inner()
|
||
|
|
scope_frame.symbols.analyze_node(node)
|
||
|
|
self.enter_frame(scope_frame)
|
||
|
|
self.blockvisit(node.body, scope_frame)
|
||
|
|
self.leave_frame(scope_frame)
|
||
|
|
|
||
|
|
def visit_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)
|