/usr/lib/python3/dist-packages/tinycss/parsing.py is in python3-tinycss 0.4-1.
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 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 | # coding: utf-8
"""
tinycss.parsing
---------------
Utilities for parsing lists of tokens.
:copyright: (c) 2012 by Simon Sapin.
:license: BSD, see LICENSE for more details.
"""
from __future__ import unicode_literals
# TODO: unit tests
def split_on_comma(tokens):
"""Split a list of tokens on commas, ie ``,`` DELIM tokens.
Only "top-level" comma tokens are splitting points, not commas inside a
function or other :class:`ContainerToken`.
:param tokens:
An iterable of :class:`~.token_data.Token` or
:class:`~.token_data.ContainerToken`.
:returns:
A list of lists of tokens
"""
parts = []
this_part = []
for token in tokens:
if token.type == 'DELIM' and token.value == ',':
parts.append(this_part)
this_part = []
else:
this_part.append(token)
parts.append(this_part)
return parts
def strip_whitespace(tokens):
"""Remove whitespace at the beggining and end of a token list.
Whitespace tokens in-between other tokens in the list are preserved.
:param tokens:
A list of :class:`~.token_data.Token` or
:class:`~.token_data.ContainerToken`.
:return:
A new sub-sequence of the list.
"""
for i, token in enumerate(tokens):
if token.type != 'S':
break
else:
return [] # only whitespace
tokens = tokens[i:]
while tokens and tokens[-1].type == 'S':
tokens.pop()
return tokens
def remove_whitespace(tokens):
"""Remove any top-level whitespace in a token list.
Whitespace tokens inside recursive :class:`~.token_data.ContainerToken`
are preserved.
:param tokens:
A list of :class:`~.token_data.Token` or
:class:`~.token_data.ContainerToken`.
:return:
A new sub-sequence of the list.
"""
return [token for token in tokens if token.type != 'S']
def validate_value(tokens):
"""Validate a property value.
:param tokens:
an iterable of tokens
:raises:
:class:`ParseError` if there is any invalid token for the 'value'
production of the core grammar.
"""
for token in tokens:
type_ = token.type
if type_ == '{':
validate_block(token.content, 'property value')
else:
validate_any(token, 'property value')
def validate_block(tokens, context):
"""
:raises:
:class:`ParseError` if there is any invalid token for the 'block'
production of the core grammar.
:param tokens: an iterable of tokens
:param context: a string for the 'unexpected in ...' message
"""
for token in tokens:
type_ = token.type
if type_ == '{':
validate_block(token.content, context)
elif type_ not in (';', 'ATKEYWORD'):
validate_any(token, context)
def validate_any(token, context):
"""
:raises:
:class:`ParseError` if this is an invalid token for the
'any' production of the core grammar.
:param token: a single token
:param context: a string for the 'unexpected in ...' message
"""
type_ = token.type
if type_ in ('FUNCTION', '(', '['):
for token in token.content:
validate_any(token, type_)
elif type_ not in ('S', 'IDENT', 'DIMENSION', 'PERCENTAGE', 'NUMBER',
'INTEGER', 'URI', 'DELIM', 'STRING', 'HASH', ':',
'UNICODE-RANGE'):
if type_ in ('}', ')', ']'):
adjective = 'unmatched'
else:
adjective = 'unexpected'
raise ParseError(
token, '{0} {1} token in {2}'.format(adjective, type_, context))
class ParseError(ValueError):
"""Details about a CSS syntax error. Usually indicates that something
(a rule or a declaration) was ignored and will not appear as a parsed
object.
This exception is typically logged in a list rather than being propagated
to the user API.
.. attribute:: line
Source line where the error occured.
.. attribute:: column
Column in the source line where the error occured.
.. attribute:: reason
What happend (a string).
"""
def __init__(self, subject, reason):
self.line = subject.line
self.column = subject.column
self.reason = reason
super(ParseError, self).__init__(
'Parse error at {0.line}:{0.column}, {0.reason}'.format(self))
|