/usr/lib/python2.7/dist-packages/sphinx/util/tags.py is in python-sphinx 1.2.2+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | # -*- coding: utf-8 -*-
"""
sphinx.util.tags
~~~~~~~~~~~~~~~~
:copyright: Copyright 2007-2014 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import warnings
# jinja2.sandbox imports the sets module on purpose
warnings.filterwarnings('ignore', 'the sets module', DeprecationWarning,
module='jinja2.sandbox')
# (ab)use the Jinja parser for parsing our boolean expressions
from jinja2 import nodes
from jinja2.parser import Parser
from jinja2.environment import Environment
env = Environment()
class BooleanParser(Parser):
"""
Only allow condition exprs and/or/not operations.
"""
def parse_compare(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)
self.stream.next()
elif token.type == 'lparen':
self.stream.next()
node = self.parse_expression()
self.stream.expect('rparen')
else:
self.fail("unexpected token '%s'" % (token,), token.lineno)
return node
class Tags(object):
def __init__(self, tags=None):
self.tags = dict.fromkeys(tags or [], True)
def has(self, tag):
return tag in self.tags
__contains__ = has
def __iter__(self):
return iter(self.tags)
def add(self, tag):
self.tags[tag] = True
def remove(self, tag):
self.tags.pop(tag, None)
def eval_condition(self, condition):
# exceptions are handled by the caller
parser = BooleanParser(env, condition, state='variable')
expr = parser.parse_expression()
if not parser.stream.eos:
raise ValueError('chunk after expression')
def eval_node(node):
if isinstance(node, nodes.CondExpr):
if eval_node(node.test):
return eval_node(node.expr1)
else:
return eval_node(node.expr2)
elif isinstance(node, nodes.And):
return eval_node(node.left) and eval_node(node.right)
elif isinstance(node, nodes.Or):
return eval_node(node.left) or eval_node(node.right)
elif isinstance(node, nodes.Not):
return not eval_node(node.node)
elif isinstance(node, nodes.Name):
return self.tags.get(node.name, False)
else:
raise ValueError('invalid node, check parsing')
return eval_node(expr)
|