/usr/lib/python2.7/dist-packages/pybtex/scanner.py is in pybtex 0.20.1-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 | # Copyright (c) 2006-2016 Andrey Golovizin
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""Base parser class
"""
import re
from pybtex.exceptions import PybtexError
class Token(object):
def __init__(self, value, pattern):
self.value = value
self.pattern = pattern
def __repr__(self):
return repr(self.value)
class Pattern(object):
def __init__(self, regexp, description, flags=0):
self.description = description
compiled_regexp = re.compile(regexp, flags=flags)
self.search = compiled_regexp.search
self.match = compiled_regexp.match
self.findall = compiled_regexp.findall
class Literal(Pattern):
def __init__(self, literal):
pattern = re.compile(re.escape(literal))
description = u"'{0}'".format(literal)
super(Literal, self).__init__(pattern, description)
class Scanner(object):
text = None
lineno = 1
pos = 0
WHITESPACE = Pattern(ur'\s+', 'whitespace')
NEWLINE = Pattern(ur'\n|(\r\n)|\r', 'newline')
def __init__(self, text, filename=None):
self.text = text
self.end_pos = len(text)
self.filename = filename
def skip_to(self, patterns):
end = None
winning_pattern = None
for pattern in patterns:
match = pattern.search(self.text, self.pos)
if match and (not end or match.end() < end):
end = match.end()
winning_pattern = pattern
if winning_pattern:
value = self.text[self.pos: end]
self.pos = end
# print '>>', value
self.update_lineno(value)
return Token(value, winning_pattern)
def update_lineno(self, value):
num_newlines = len(self.NEWLINE.findall(value))
self.lineno += num_newlines
def eat_whitespace(self):
whitespace = self.WHITESPACE.match(self.text, self.pos)
if whitespace:
self.pos = whitespace.end()
self.update_lineno(whitespace.group())
def eof(self):
return self.pos == self.end_pos
def get_token(self, patterns, allow_eof=False):
self.eat_whitespace()
if self.eof():
if allow_eof:
raise EOFError
else:
raise PrematureEOF(self)
for pattern in patterns:
match = pattern.match(self.text, self.pos)
if match:
value = match.group()
self.pos = match.end()
# print '->', value
return Token(value, pattern)
def optional(self, patterns, allow_eof=False):
return self.get_token(patterns, allow_eof=allow_eof)
def required(self, patterns, description=None, allow_eof=False):
token = self.get_token(patterns, allow_eof=allow_eof)
if token is None:
if not description:
description = ' or '.join(pattern.description for pattern in patterns)
raise TokenRequired(description, self)
else:
return token
def get_error_context_info(self):
return self.lineno, self.pos
def get_error_context(self, context_info):
error_lineno, error_pos = context_info
if error_lineno is not None:
error_lineno0 = error_lineno - 1
lines = self.text.splitlines(True)
before_error = ''.join(lines[:error_lineno0])
colno = error_pos - len(before_error)
context = lines[error_lineno0].rstrip('\r\n')
else:
colno = None
context = None
return context, error_lineno, colno
def get_remainder(self):
return self.text[self.pos:]
class PybtexSyntaxError(PybtexError):
error_type = 'syntax error'
def __init__(self, message, parser):
super(PybtexSyntaxError, self).__init__(message, filename=parser.filename)
self.lineno = parser.lineno
self.parser = parser
self.error_context_info = parser.get_error_context_info()
def __unicode__(self):
base_message = super(PybtexSyntaxError, self).__unicode__()
pos = u' in line {0}'.format(self.lineno) if self.lineno is not None else ''
return u'{error_type}{pos}: {message}'.format(
error_type=self.error_type,
pos=pos,
message=base_message,
)
class PrematureEOF(PybtexSyntaxError):
def __init__(self, parser):
message = 'premature end of file'
super(PrematureEOF, self).__init__(message, parser)
class TokenRequired(PybtexSyntaxError):
def __init__(self, description, parser):
message = u'{0} expected'.format(description)
super(TokenRequired, self).__init__(message, parser)
def get_context(self):
context, lineno, colno = self.parser.get_error_context(self.error_context_info)
if context is None:
return ''
if colno == 0:
marker = '^^'
else:
marker = ' ' * (colno - 1) + '^^^'
return '\n'.join((context, marker))
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