FeatureEnVi: Visual Analytics for Feature Engineering Using Stepwise Selection and Semi-Automatic Extraction Approaches
https://doi.org/10.1109/TVCG.2022.3141040
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903 lines
35 KiB
903 lines
35 KiB
# -*- coding: utf-8 -*-
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"""
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jinja2.parser
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~~~~~~~~~~~~~
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Implements the template parser.
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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 jinja2 import nodes
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from jinja2.exceptions import TemplateSyntaxError, TemplateAssertionError
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from jinja2.lexer import describe_token, describe_token_expr
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from jinja2._compat import imap
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_statement_keywords = frozenset(['for', 'if', 'block', 'extends', 'print',
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'macro', 'include', 'from', 'import',
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'set', 'with', 'autoescape'])
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_compare_operators = frozenset(['eq', 'ne', 'lt', 'lteq', 'gt', 'gteq'])
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_math_nodes = {
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'add': nodes.Add,
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'sub': nodes.Sub,
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'mul': nodes.Mul,
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'div': nodes.Div,
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'floordiv': nodes.FloorDiv,
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'mod': nodes.Mod,
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}
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class Parser(object):
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"""This is the central parsing class Jinja2 uses. It's passed to
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extensions and can be used to parse expressions or statements.
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"""
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def __init__(self, environment, source, name=None, filename=None,
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state=None):
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self.environment = environment
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self.stream = environment._tokenize(source, name, filename, state)
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self.name = name
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self.filename = filename
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self.closed = False
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self.extensions = {}
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for extension in environment.iter_extensions():
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for tag in extension.tags:
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self.extensions[tag] = extension.parse
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self._last_identifier = 0
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self._tag_stack = []
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self._end_token_stack = []
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def fail(self, msg, lineno=None, exc=TemplateSyntaxError):
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"""Convenience method that raises `exc` with the message, passed
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line number or last line number as well as the current name and
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filename.
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"""
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if lineno is None:
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lineno = self.stream.current.lineno
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raise exc(msg, lineno, self.name, self.filename)
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def _fail_ut_eof(self, name, end_token_stack, lineno):
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expected = []
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for exprs in end_token_stack:
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expected.extend(imap(describe_token_expr, exprs))
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if end_token_stack:
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currently_looking = ' or '.join(
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"'%s'" % describe_token_expr(expr)
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for expr in end_token_stack[-1])
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else:
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currently_looking = None
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if name is None:
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message = ['Unexpected end of template.']
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else:
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message = ['Encountered unknown tag \'%s\'.' % name]
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if currently_looking:
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if name is not None and name in expected:
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message.append('You probably made a nesting mistake. Jinja '
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'is expecting this tag, but currently looking '
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'for %s.' % currently_looking)
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else:
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message.append('Jinja was looking for the following tags: '
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'%s.' % currently_looking)
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if self._tag_stack:
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message.append('The innermost block that needs to be '
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'closed is \'%s\'.' % self._tag_stack[-1])
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self.fail(' '.join(message), lineno)
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def fail_unknown_tag(self, name, lineno=None):
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"""Called if the parser encounters an unknown tag. Tries to fail
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with a human readable error message that could help to identify
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the problem.
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"""
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return self._fail_ut_eof(name, self._end_token_stack, lineno)
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def fail_eof(self, end_tokens=None, lineno=None):
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"""Like fail_unknown_tag but for end of template situations."""
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stack = list(self._end_token_stack)
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if end_tokens is not None:
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stack.append(end_tokens)
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return self._fail_ut_eof(None, stack, lineno)
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def is_tuple_end(self, extra_end_rules=None):
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"""Are we at the end of a tuple?"""
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if self.stream.current.type in ('variable_end', 'block_end', 'rparen'):
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return True
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elif extra_end_rules is not None:
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return self.stream.current.test_any(extra_end_rules)
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return False
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def free_identifier(self, lineno=None):
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"""Return a new free identifier as :class:`~jinja2.nodes.InternalName`."""
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self._last_identifier += 1
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rv = object.__new__(nodes.InternalName)
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nodes.Node.__init__(rv, 'fi%d' % self._last_identifier, lineno=lineno)
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return rv
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def parse_statement(self):
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"""Parse a single statement."""
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token = self.stream.current
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if token.type != 'name':
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self.fail('tag name expected', token.lineno)
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self._tag_stack.append(token.value)
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pop_tag = True
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try:
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if token.value in _statement_keywords:
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return getattr(self, 'parse_' + self.stream.current.value)()
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if token.value == 'call':
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return self.parse_call_block()
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if token.value == 'filter':
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return self.parse_filter_block()
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ext = self.extensions.get(token.value)
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if ext is not None:
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return ext(self)
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# did not work out, remove the token we pushed by accident
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# from the stack so that the unknown tag fail function can
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# produce a proper error message.
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self._tag_stack.pop()
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pop_tag = False
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self.fail_unknown_tag(token.value, token.lineno)
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finally:
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if pop_tag:
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self._tag_stack.pop()
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def parse_statements(self, end_tokens, drop_needle=False):
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"""Parse multiple statements into a list until one of the end tokens
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is reached. This is used to parse the body of statements as it also
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parses template data if appropriate. The parser checks first if the
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current token is a colon and skips it if there is one. Then it checks
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for the block end and parses until if one of the `end_tokens` is
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reached. Per default the active token in the stream at the end of
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the call is the matched end token. If this is not wanted `drop_needle`
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can be set to `True` and the end token is removed.
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"""
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# the first token may be a colon for python compatibility
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self.stream.skip_if('colon')
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# in the future it would be possible to add whole code sections
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# by adding some sort of end of statement token and parsing those here.
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self.stream.expect('block_end')
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result = self.subparse(end_tokens)
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# we reached the end of the template too early, the subparser
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# does not check for this, so we do that now
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if self.stream.current.type == 'eof':
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self.fail_eof(end_tokens)
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if drop_needle:
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next(self.stream)
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return result
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def parse_set(self):
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"""Parse an assign statement."""
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lineno = next(self.stream).lineno
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target = self.parse_assign_target(with_namespace=True)
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if self.stream.skip_if('assign'):
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expr = self.parse_tuple()
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return nodes.Assign(target, expr, lineno=lineno)
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filter_node = self.parse_filter(None)
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body = self.parse_statements(('name:endset',),
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drop_needle=True)
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return nodes.AssignBlock(target, filter_node, body, lineno=lineno)
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def parse_for(self):
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"""Parse a for loop."""
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lineno = self.stream.expect('name:for').lineno
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target = self.parse_assign_target(extra_end_rules=('name:in',))
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self.stream.expect('name:in')
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iter = self.parse_tuple(with_condexpr=False,
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extra_end_rules=('name:recursive',))
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test = None
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if self.stream.skip_if('name:if'):
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test = self.parse_expression()
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recursive = self.stream.skip_if('name:recursive')
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body = self.parse_statements(('name:endfor', 'name:else'))
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if next(self.stream).value == 'endfor':
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else_ = []
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else:
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else_ = self.parse_statements(('name:endfor',), drop_needle=True)
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return nodes.For(target, iter, body, else_, test,
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recursive, lineno=lineno)
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def parse_if(self):
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"""Parse an if construct."""
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node = result = nodes.If(lineno=self.stream.expect('name:if').lineno)
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while 1:
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node.test = self.parse_tuple(with_condexpr=False)
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node.body = self.parse_statements(('name:elif', 'name:else',
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'name:endif'))
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node.elif_ = []
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node.else_ = []
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token = next(self.stream)
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if token.test('name:elif'):
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node = nodes.If(lineno=self.stream.current.lineno)
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result.elif_.append(node)
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continue
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elif token.test('name:else'):
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result.else_ = self.parse_statements(('name:endif',),
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drop_needle=True)
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break
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return result
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def parse_with(self):
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node = nodes.With(lineno=next(self.stream).lineno)
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targets = []
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values = []
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while self.stream.current.type != 'block_end':
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lineno = self.stream.current.lineno
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if targets:
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self.stream.expect('comma')
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target = self.parse_assign_target()
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target.set_ctx('param')
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targets.append(target)
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self.stream.expect('assign')
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values.append(self.parse_expression())
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node.targets = targets
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node.values = values
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node.body = self.parse_statements(('name:endwith',),
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drop_needle=True)
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return node
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def parse_autoescape(self):
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node = nodes.ScopedEvalContextModifier(lineno=next(self.stream).lineno)
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node.options = [
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nodes.Keyword('autoescape', self.parse_expression())
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]
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node.body = self.parse_statements(('name:endautoescape',),
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drop_needle=True)
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return nodes.Scope([node])
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def parse_block(self):
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node = nodes.Block(lineno=next(self.stream).lineno)
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node.name = self.stream.expect('name').value
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node.scoped = self.stream.skip_if('name:scoped')
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# common problem people encounter when switching from django
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# to jinja. we do not support hyphens in block names, so let's
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# raise a nicer error message in that case.
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if self.stream.current.type == 'sub':
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self.fail('Block names in Jinja have to be valid Python '
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'identifiers and may not contain hyphens, use an '
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'underscore instead.')
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node.body = self.parse_statements(('name:endblock',), drop_needle=True)
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self.stream.skip_if('name:' + node.name)
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return node
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def parse_extends(self):
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node = nodes.Extends(lineno=next(self.stream).lineno)
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node.template = self.parse_expression()
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return node
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def parse_import_context(self, node, default):
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if self.stream.current.test_any('name:with', 'name:without') and \
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self.stream.look().test('name:context'):
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node.with_context = next(self.stream).value == 'with'
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self.stream.skip()
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else:
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node.with_context = default
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return node
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def parse_include(self):
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node = nodes.Include(lineno=next(self.stream).lineno)
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node.template = self.parse_expression()
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if self.stream.current.test('name:ignore') and \
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self.stream.look().test('name:missing'):
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node.ignore_missing = True
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self.stream.skip(2)
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else:
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node.ignore_missing = False
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return self.parse_import_context(node, True)
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def parse_import(self):
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node = nodes.Import(lineno=next(self.stream).lineno)
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node.template = self.parse_expression()
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self.stream.expect('name:as')
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node.target = self.parse_assign_target(name_only=True).name
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return self.parse_import_context(node, False)
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def parse_from(self):
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node = nodes.FromImport(lineno=next(self.stream).lineno)
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node.template = self.parse_expression()
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self.stream.expect('name:import')
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node.names = []
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def parse_context():
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if self.stream.current.value in ('with', 'without') and \
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self.stream.look().test('name:context'):
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node.with_context = next(self.stream).value == 'with'
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self.stream.skip()
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return True
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return False
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while 1:
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if node.names:
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self.stream.expect('comma')
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if self.stream.current.type == 'name':
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if parse_context():
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break
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target = self.parse_assign_target(name_only=True)
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if target.name.startswith('_'):
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self.fail('names starting with an underline can not '
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'be imported', target.lineno,
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exc=TemplateAssertionError)
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if self.stream.skip_if('name:as'):
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alias = self.parse_assign_target(name_only=True)
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node.names.append((target.name, alias.name))
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else:
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node.names.append(target.name)
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if parse_context() or self.stream.current.type != 'comma':
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break
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else:
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self.stream.expect('name')
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if not hasattr(node, 'with_context'):
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node.with_context = False
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return node
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def parse_signature(self, node):
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node.args = args = []
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node.defaults = defaults = []
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self.stream.expect('lparen')
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while self.stream.current.type != 'rparen':
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if args:
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self.stream.expect('comma')
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arg = self.parse_assign_target(name_only=True)
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arg.set_ctx('param')
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if self.stream.skip_if('assign'):
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defaults.append(self.parse_expression())
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elif defaults:
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self.fail('non-default argument follows default argument')
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args.append(arg)
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self.stream.expect('rparen')
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def parse_call_block(self):
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node = nodes.CallBlock(lineno=next(self.stream).lineno)
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if self.stream.current.type == 'lparen':
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self.parse_signature(node)
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else:
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node.args = []
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node.defaults = []
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node.call = self.parse_expression()
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if not isinstance(node.call, nodes.Call):
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self.fail('expected call', node.lineno)
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node.body = self.parse_statements(('name:endcall',), drop_needle=True)
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return node
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def parse_filter_block(self):
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node = nodes.FilterBlock(lineno=next(self.stream).lineno)
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node.filter = self.parse_filter(None, start_inline=True)
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node.body = self.parse_statements(('name:endfilter',),
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drop_needle=True)
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return node
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def parse_macro(self):
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node = nodes.Macro(lineno=next(self.stream).lineno)
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node.name = self.parse_assign_target(name_only=True).name
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self.parse_signature(node)
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node.body = self.parse_statements(('name:endmacro',),
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drop_needle=True)
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return node
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def parse_print(self):
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node = nodes.Output(lineno=next(self.stream).lineno)
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node.nodes = []
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while self.stream.current.type != 'block_end':
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if node.nodes:
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self.stream.expect('comma')
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node.nodes.append(self.parse_expression())
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return node
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def parse_assign_target(self, with_tuple=True, name_only=False,
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extra_end_rules=None, with_namespace=False):
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"""Parse an assignment target. As Jinja2 allows assignments to
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tuples, this function can parse all allowed assignment targets. Per
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default assignments to tuples are parsed, that can be disable however
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by setting `with_tuple` to `False`. If only assignments to names are
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wanted `name_only` can be set to `True`. The `extra_end_rules`
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parameter is forwarded to the tuple parsing function. If
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`with_namespace` is enabled, a namespace assignment may be parsed.
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"""
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if with_namespace and self.stream.look().type == 'dot':
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token = self.stream.expect('name')
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next(self.stream) # dot
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attr = self.stream.expect('name')
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target = nodes.NSRef(token.value, attr.value, lineno=token.lineno)
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elif name_only:
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token = self.stream.expect('name')
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target = nodes.Name(token.value, 'store', lineno=token.lineno)
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else:
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if with_tuple:
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target = self.parse_tuple(simplified=True,
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extra_end_rules=extra_end_rules)
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else:
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target = self.parse_primary()
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target.set_ctx('store')
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if not target.can_assign():
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self.fail('can\'t assign to %r' % target.__class__.
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__name__.lower(), target.lineno)
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return target
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def parse_expression(self, with_condexpr=True):
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"""Parse an expression. Per default all expressions are parsed, if
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the optional `with_condexpr` parameter is set to `False` conditional
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expressions are not parsed.
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"""
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if with_condexpr:
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return self.parse_condexpr()
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return self.parse_or()
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def parse_condexpr(self):
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lineno = self.stream.current.lineno
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expr1 = self.parse_or()
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while self.stream.skip_if('name:if'):
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expr2 = self.parse_or()
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if self.stream.skip_if('name:else'):
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expr3 = self.parse_condexpr()
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else:
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expr3 = None
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expr1 = nodes.CondExpr(expr2, expr1, expr3, lineno=lineno)
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lineno = self.stream.current.lineno
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return expr1
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def parse_or(self):
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lineno = self.stream.current.lineno
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left = self.parse_and()
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while self.stream.skip_if('name:or'):
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right = self.parse_and()
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left = nodes.Or(left, right, lineno=lineno)
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lineno = self.stream.current.lineno
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return left
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def parse_and(self):
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lineno = self.stream.current.lineno
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left = self.parse_not()
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while self.stream.skip_if('name:and'):
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right = self.parse_not()
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left = nodes.And(left, right, lineno=lineno)
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lineno = self.stream.current.lineno
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return left
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def parse_not(self):
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if self.stream.current.test('name:not'):
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lineno = next(self.stream).lineno
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return nodes.Not(self.parse_not(), lineno=lineno)
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return self.parse_compare()
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def parse_compare(self):
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lineno = self.stream.current.lineno
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expr = self.parse_math1()
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ops = []
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while 1:
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token_type = self.stream.current.type
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if token_type in _compare_operators:
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next(self.stream)
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ops.append(nodes.Operand(token_type, self.parse_math1()))
|
|
elif self.stream.skip_if('name:in'):
|
|
ops.append(nodes.Operand('in', self.parse_math1()))
|
|
elif (self.stream.current.test('name:not') and
|
|
self.stream.look().test('name:in')):
|
|
self.stream.skip(2)
|
|
ops.append(nodes.Operand('notin', self.parse_math1()))
|
|
else:
|
|
break
|
|
lineno = self.stream.current.lineno
|
|
if not ops:
|
|
return expr
|
|
return nodes.Compare(expr, ops, lineno=lineno)
|
|
|
|
def parse_math1(self):
|
|
lineno = self.stream.current.lineno
|
|
left = self.parse_concat()
|
|
while self.stream.current.type in ('add', 'sub'):
|
|
cls = _math_nodes[self.stream.current.type]
|
|
next(self.stream)
|
|
right = self.parse_concat()
|
|
left = cls(left, right, lineno=lineno)
|
|
lineno = self.stream.current.lineno
|
|
return left
|
|
|
|
def parse_concat(self):
|
|
lineno = self.stream.current.lineno
|
|
args = [self.parse_math2()]
|
|
while self.stream.current.type == 'tilde':
|
|
next(self.stream)
|
|
args.append(self.parse_math2())
|
|
if len(args) == 1:
|
|
return args[0]
|
|
return nodes.Concat(args, lineno=lineno)
|
|
|
|
def parse_math2(self):
|
|
lineno = self.stream.current.lineno
|
|
left = self.parse_pow()
|
|
while self.stream.current.type in ('mul', 'div', 'floordiv', 'mod'):
|
|
cls = _math_nodes[self.stream.current.type]
|
|
next(self.stream)
|
|
right = self.parse_pow()
|
|
left = cls(left, right, lineno=lineno)
|
|
lineno = self.stream.current.lineno
|
|
return left
|
|
|
|
def parse_pow(self):
|
|
lineno = self.stream.current.lineno
|
|
left = self.parse_unary()
|
|
while self.stream.current.type == 'pow':
|
|
next(self.stream)
|
|
right = self.parse_unary()
|
|
left = nodes.Pow(left, right, lineno=lineno)
|
|
lineno = self.stream.current.lineno
|
|
return left
|
|
|
|
def parse_unary(self, with_filter=True):
|
|
token_type = self.stream.current.type
|
|
lineno = self.stream.current.lineno
|
|
if token_type == 'sub':
|
|
next(self.stream)
|
|
node = nodes.Neg(self.parse_unary(False), lineno=lineno)
|
|
elif token_type == 'add':
|
|
next(self.stream)
|
|
node = nodes.Pos(self.parse_unary(False), lineno=lineno)
|
|
else:
|
|
node = self.parse_primary()
|
|
node = self.parse_postfix(node)
|
|
if with_filter:
|
|
node = self.parse_filter_expr(node)
|
|
return node
|
|
|
|
def parse_primary(self):
|
|
token = self.stream.current
|
|
if token.type == 'name':
|
|
if token.value in ('true', 'false', 'True', 'False'):
|
|
node = nodes.Const(token.value in ('true', 'True'),
|
|
lineno=token.lineno)
|
|
elif token.value in ('none', 'None'):
|
|
node = nodes.Const(None, lineno=token.lineno)
|
|
else:
|
|
node = nodes.Name(token.value, 'load', lineno=token.lineno)
|
|
next(self.stream)
|
|
elif token.type == 'string':
|
|
next(self.stream)
|
|
buf = [token.value]
|
|
lineno = token.lineno
|
|
while self.stream.current.type == 'string':
|
|
buf.append(self.stream.current.value)
|
|
next(self.stream)
|
|
node = nodes.Const(''.join(buf), lineno=lineno)
|
|
elif token.type in ('integer', 'float'):
|
|
next(self.stream)
|
|
node = nodes.Const(token.value, lineno=token.lineno)
|
|
elif token.type == 'lparen':
|
|
next(self.stream)
|
|
node = self.parse_tuple(explicit_parentheses=True)
|
|
self.stream.expect('rparen')
|
|
elif token.type == 'lbracket':
|
|
node = self.parse_list()
|
|
elif token.type == 'lbrace':
|
|
node = self.parse_dict()
|
|
else:
|
|
self.fail("unexpected '%s'" % describe_token(token), token.lineno)
|
|
return node
|
|
|
|
def parse_tuple(self, simplified=False, with_condexpr=True,
|
|
extra_end_rules=None, explicit_parentheses=False):
|
|
"""Works like `parse_expression` but if multiple expressions are
|
|
delimited by a comma a :class:`~jinja2.nodes.Tuple` node is created.
|
|
This method could also return a regular expression instead of a tuple
|
|
if no commas where found.
|
|
|
|
The default parsing mode is a full tuple. If `simplified` is `True`
|
|
only names and literals are parsed. The `no_condexpr` parameter is
|
|
forwarded to :meth:`parse_expression`.
|
|
|
|
Because tuples do not require delimiters and may end in a bogus comma
|
|
an extra hint is needed that marks the end of a tuple. For example
|
|
for loops support tuples between `for` and `in`. In that case the
|
|
`extra_end_rules` is set to ``['name:in']``.
|
|
|
|
`explicit_parentheses` is true if the parsing was triggered by an
|
|
expression in parentheses. This is used to figure out if an empty
|
|
tuple is a valid expression or not.
|
|
"""
|
|
lineno = self.stream.current.lineno
|
|
if simplified:
|
|
parse = self.parse_primary
|
|
elif with_condexpr:
|
|
parse = self.parse_expression
|
|
else:
|
|
parse = lambda: self.parse_expression(with_condexpr=False)
|
|
args = []
|
|
is_tuple = False
|
|
while 1:
|
|
if args:
|
|
self.stream.expect('comma')
|
|
if self.is_tuple_end(extra_end_rules):
|
|
break
|
|
args.append(parse())
|
|
if self.stream.current.type == 'comma':
|
|
is_tuple = True
|
|
else:
|
|
break
|
|
lineno = self.stream.current.lineno
|
|
|
|
if not is_tuple:
|
|
if args:
|
|
return args[0]
|
|
|
|
# if we don't have explicit parentheses, an empty tuple is
|
|
# not a valid expression. This would mean nothing (literally
|
|
# nothing) in the spot of an expression would be an empty
|
|
# tuple.
|
|
if not explicit_parentheses:
|
|
self.fail('Expected an expression, got \'%s\'' %
|
|
describe_token(self.stream.current))
|
|
|
|
return nodes.Tuple(args, 'load', lineno=lineno)
|
|
|
|
def parse_list(self):
|
|
token = self.stream.expect('lbracket')
|
|
items = []
|
|
while self.stream.current.type != 'rbracket':
|
|
if items:
|
|
self.stream.expect('comma')
|
|
if self.stream.current.type == 'rbracket':
|
|
break
|
|
items.append(self.parse_expression())
|
|
self.stream.expect('rbracket')
|
|
return nodes.List(items, lineno=token.lineno)
|
|
|
|
def parse_dict(self):
|
|
token = self.stream.expect('lbrace')
|
|
items = []
|
|
while self.stream.current.type != 'rbrace':
|
|
if items:
|
|
self.stream.expect('comma')
|
|
if self.stream.current.type == 'rbrace':
|
|
break
|
|
key = self.parse_expression()
|
|
self.stream.expect('colon')
|
|
value = self.parse_expression()
|
|
items.append(nodes.Pair(key, value, lineno=key.lineno))
|
|
self.stream.expect('rbrace')
|
|
return nodes.Dict(items, lineno=token.lineno)
|
|
|
|
def parse_postfix(self, node):
|
|
while 1:
|
|
token_type = self.stream.current.type
|
|
if token_type == 'dot' or token_type == 'lbracket':
|
|
node = self.parse_subscript(node)
|
|
# calls are valid both after postfix expressions (getattr
|
|
# and getitem) as well as filters and tests
|
|
elif token_type == 'lparen':
|
|
node = self.parse_call(node)
|
|
else:
|
|
break
|
|
return node
|
|
|
|
def parse_filter_expr(self, node):
|
|
while 1:
|
|
token_type = self.stream.current.type
|
|
if token_type == 'pipe':
|
|
node = self.parse_filter(node)
|
|
elif token_type == 'name' and self.stream.current.value == 'is':
|
|
node = self.parse_test(node)
|
|
# calls are valid both after postfix expressions (getattr
|
|
# and getitem) as well as filters and tests
|
|
elif token_type == 'lparen':
|
|
node = self.parse_call(node)
|
|
else:
|
|
break
|
|
return node
|
|
|
|
def parse_subscript(self, node):
|
|
token = next(self.stream)
|
|
if token.type == 'dot':
|
|
attr_token = self.stream.current
|
|
next(self.stream)
|
|
if attr_token.type == 'name':
|
|
return nodes.Getattr(node, attr_token.value, 'load',
|
|
lineno=token.lineno)
|
|
elif attr_token.type != 'integer':
|
|
self.fail('expected name or number', attr_token.lineno)
|
|
arg = nodes.Const(attr_token.value, lineno=attr_token.lineno)
|
|
return nodes.Getitem(node, arg, 'load', lineno=token.lineno)
|
|
if token.type == 'lbracket':
|
|
args = []
|
|
while self.stream.current.type != 'rbracket':
|
|
if args:
|
|
self.stream.expect('comma')
|
|
args.append(self.parse_subscribed())
|
|
self.stream.expect('rbracket')
|
|
if len(args) == 1:
|
|
arg = args[0]
|
|
else:
|
|
arg = nodes.Tuple(args, 'load', lineno=token.lineno)
|
|
return nodes.Getitem(node, arg, 'load', lineno=token.lineno)
|
|
self.fail('expected subscript expression', self.lineno)
|
|
|
|
def parse_subscribed(self):
|
|
lineno = self.stream.current.lineno
|
|
|
|
if self.stream.current.type == 'colon':
|
|
next(self.stream)
|
|
args = [None]
|
|
else:
|
|
node = self.parse_expression()
|
|
if self.stream.current.type != 'colon':
|
|
return node
|
|
next(self.stream)
|
|
args = [node]
|
|
|
|
if self.stream.current.type == 'colon':
|
|
args.append(None)
|
|
elif self.stream.current.type not in ('rbracket', 'comma'):
|
|
args.append(self.parse_expression())
|
|
else:
|
|
args.append(None)
|
|
|
|
if self.stream.current.type == 'colon':
|
|
next(self.stream)
|
|
if self.stream.current.type not in ('rbracket', 'comma'):
|
|
args.append(self.parse_expression())
|
|
else:
|
|
args.append(None)
|
|
else:
|
|
args.append(None)
|
|
|
|
return nodes.Slice(lineno=lineno, *args)
|
|
|
|
def parse_call(self, node):
|
|
token = self.stream.expect('lparen')
|
|
args = []
|
|
kwargs = []
|
|
dyn_args = dyn_kwargs = None
|
|
require_comma = False
|
|
|
|
def ensure(expr):
|
|
if not expr:
|
|
self.fail('invalid syntax for function call expression',
|
|
token.lineno)
|
|
|
|
while self.stream.current.type != 'rparen':
|
|
if require_comma:
|
|
self.stream.expect('comma')
|
|
# support for trailing comma
|
|
if self.stream.current.type == 'rparen':
|
|
break
|
|
if self.stream.current.type == 'mul':
|
|
ensure(dyn_args is None and dyn_kwargs is None)
|
|
next(self.stream)
|
|
dyn_args = self.parse_expression()
|
|
elif self.stream.current.type == 'pow':
|
|
ensure(dyn_kwargs is None)
|
|
next(self.stream)
|
|
dyn_kwargs = self.parse_expression()
|
|
else:
|
|
ensure(dyn_args is None and dyn_kwargs is None)
|
|
if self.stream.current.type == 'name' and \
|
|
self.stream.look().type == 'assign':
|
|
key = self.stream.current.value
|
|
self.stream.skip(2)
|
|
value = self.parse_expression()
|
|
kwargs.append(nodes.Keyword(key, value,
|
|
lineno=value.lineno))
|
|
else:
|
|
ensure(not kwargs)
|
|
args.append(self.parse_expression())
|
|
|
|
require_comma = True
|
|
self.stream.expect('rparen')
|
|
|
|
if node is None:
|
|
return args, kwargs, dyn_args, dyn_kwargs
|
|
return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs,
|
|
lineno=token.lineno)
|
|
|
|
def parse_filter(self, node, start_inline=False):
|
|
while self.stream.current.type == 'pipe' or start_inline:
|
|
if not start_inline:
|
|
next(self.stream)
|
|
token = self.stream.expect('name')
|
|
name = token.value
|
|
while self.stream.current.type == 'dot':
|
|
next(self.stream)
|
|
name += '.' + self.stream.expect('name').value
|
|
if self.stream.current.type == 'lparen':
|
|
args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
|
|
else:
|
|
args = []
|
|
kwargs = []
|
|
dyn_args = dyn_kwargs = None
|
|
node = nodes.Filter(node, name, args, kwargs, dyn_args,
|
|
dyn_kwargs, lineno=token.lineno)
|
|
start_inline = False
|
|
return node
|
|
|
|
def parse_test(self, node):
|
|
token = next(self.stream)
|
|
if self.stream.current.test('name:not'):
|
|
next(self.stream)
|
|
negated = True
|
|
else:
|
|
negated = False
|
|
name = self.stream.expect('name').value
|
|
while self.stream.current.type == 'dot':
|
|
next(self.stream)
|
|
name += '.' + self.stream.expect('name').value
|
|
dyn_args = dyn_kwargs = None
|
|
kwargs = []
|
|
if self.stream.current.type == 'lparen':
|
|
args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
|
|
elif (self.stream.current.type in ('name', 'string', 'integer',
|
|
'float', 'lparen', 'lbracket',
|
|
'lbrace') and not
|
|
self.stream.current.test_any('name:else', 'name:or',
|
|
'name:and')):
|
|
if self.stream.current.test('name:is'):
|
|
self.fail('You cannot chain multiple tests with is')
|
|
args = [self.parse_primary()]
|
|
else:
|
|
args = []
|
|
node = nodes.Test(node, name, args, kwargs, dyn_args,
|
|
dyn_kwargs, lineno=token.lineno)
|
|
if negated:
|
|
node = nodes.Not(node, lineno=token.lineno)
|
|
return node
|
|
|
|
def subparse(self, end_tokens=None):
|
|
body = []
|
|
data_buffer = []
|
|
add_data = data_buffer.append
|
|
|
|
if end_tokens is not None:
|
|
self._end_token_stack.append(end_tokens)
|
|
|
|
def flush_data():
|
|
if data_buffer:
|
|
lineno = data_buffer[0].lineno
|
|
body.append(nodes.Output(data_buffer[:], lineno=lineno))
|
|
del data_buffer[:]
|
|
|
|
try:
|
|
while self.stream:
|
|
token = self.stream.current
|
|
if token.type == 'data':
|
|
if token.value:
|
|
add_data(nodes.TemplateData(token.value,
|
|
lineno=token.lineno))
|
|
next(self.stream)
|
|
elif token.type == 'variable_begin':
|
|
next(self.stream)
|
|
add_data(self.parse_tuple(with_condexpr=True))
|
|
self.stream.expect('variable_end')
|
|
elif token.type == 'block_begin':
|
|
flush_data()
|
|
next(self.stream)
|
|
if end_tokens is not None and \
|
|
self.stream.current.test_any(*end_tokens):
|
|
return body
|
|
rv = self.parse_statement()
|
|
if isinstance(rv, list):
|
|
body.extend(rv)
|
|
else:
|
|
body.append(rv)
|
|
self.stream.expect('block_end')
|
|
else:
|
|
raise AssertionError('internal parsing error')
|
|
|
|
flush_data()
|
|
finally:
|
|
if end_tokens is not None:
|
|
self._end_token_stack.pop()
|
|
|
|
return body
|
|
|
|
def parse(self):
|
|
"""Parse the whole template into a `Template` node."""
|
|
result = nodes.Template(self.subparse(), lineno=1)
|
|
result.set_environment(self.environment)
|
|
return result
|
|
|