/usr/share/pyshared/babel/messages/jslexer.py is in python-babel 0.9.6-1build1.
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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 | # -*- coding: utf-8 -*-
#
# Copyright (C) 2008 Edgewall Software
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://babel.edgewall.org/wiki/License.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://babel.edgewall.org/log/.
"""A simple JavaScript 1.5 lexer which is used for the JavaScript
extractor.
"""
import re
from babel.util import itemgetter
operators = [
'+', '-', '*', '%', '!=', '==', '<', '>', '<=', '>=', '=',
'+=', '-=', '*=', '%=', '<<', '>>', '>>>', '<<=', '>>=',
'>>>=', '&', '&=', '|', '|=', '&&', '||', '^', '^=', '(', ')',
'[', ']', '{', '}', '!', '--', '++', '~', ',', ';', '.', ':'
]
operators.sort(lambda a, b: cmp(-len(a), -len(b)))
escapes = {'b': '\b', 'f': '\f', 'n': '\n', 'r': '\r', 't': '\t'}
rules = [
(None, re.compile(r'\s+(?u)')),
(None, re.compile(r'<!--.*')),
('linecomment', re.compile(r'//.*')),
('multilinecomment', re.compile(r'/\*.*?\*/(?us)')),
('name', re.compile(r'(\$+\w*|[^\W\d]\w*)(?u)')),
('number', re.compile(r'''(?x)(
(?:0|[1-9]\d*)
(\.\d+)?
([eE][-+]?\d+)? |
(0x[a-fA-F0-9]+)
)''')),
('operator', re.compile(r'(%s)' % '|'.join(map(re.escape, operators)))),
('string', re.compile(r'''(?xs)(
'(?:[^'\\]*(?:\\.[^'\\]*)*)' |
"(?:[^"\\]*(?:\\.[^"\\]*)*)"
)'''))
]
division_re = re.compile(r'/=?')
regex_re = re.compile(r'/(?:[^/\\]*(?:\\.[^/\\]*)*)/[a-zA-Z]*(?s)')
line_re = re.compile(r'(\r\n|\n|\r)')
line_join_re = re.compile(r'\\' + line_re.pattern)
uni_escape_re = re.compile(r'[a-fA-F0-9]{1,4}')
class Token(tuple):
"""Represents a token as returned by `tokenize`."""
__slots__ = ()
def __new__(cls, type, value, lineno):
return tuple.__new__(cls, (type, value, lineno))
type = property(itemgetter(0))
value = property(itemgetter(1))
lineno = property(itemgetter(2))
def indicates_division(token):
"""A helper function that helps the tokenizer to decide if the current
token may be followed by a division operator.
"""
if token.type == 'operator':
return token.value in (')', ']', '}', '++', '--')
return token.type in ('name', 'number', 'string', 'regexp')
def unquote_string(string):
"""Unquote a string with JavaScript rules. The string has to start with
string delimiters (``'`` or ``"``.)
:return: a string
"""
assert string and string[0] == string[-1] and string[0] in '"\'', \
'string provided is not properly delimited'
string = line_join_re.sub('\\1', string[1:-1])
result = []
add = result.append
pos = 0
while 1:
# scan for the next escape
escape_pos = string.find('\\', pos)
if escape_pos < 0:
break
add(string[pos:escape_pos])
# check which character is escaped
next_char = string[escape_pos + 1]
if next_char in escapes:
add(escapes[next_char])
# unicode escapes. trie to consume up to four characters of
# hexadecimal characters and try to interpret them as unicode
# character point. If there is no such character point, put
# all the consumed characters into the string.
elif next_char in 'uU':
escaped = uni_escape_re.match(string, escape_pos + 2)
if escaped is not None:
escaped_value = escaped.group()
if len(escaped_value) == 4:
try:
add(unichr(int(escaped_value, 16)))
except ValueError:
pass
else:
pos = escape_pos + 6
continue
add(next_char + escaped_value)
pos = escaped.end()
continue
else:
add(next_char)
# bogus escape. Just remove the backslash.
else:
add(next_char)
pos = escape_pos + 2
if pos < len(string):
add(string[pos:])
return u''.join(result)
def tokenize(source):
"""Tokenize a JavaScript source.
:return: generator of `Token`\s
"""
may_divide = False
pos = 0
lineno = 1
end = len(source)
while pos < end:
# handle regular rules first
for token_type, rule in rules:
match = rule.match(source, pos)
if match is not None:
break
# if we don't have a match we don't give up yet, but check for
# division operators or regular expression literals, based on
# the status of `may_divide` which is determined by the last
# processed non-whitespace token using `indicates_division`.
else:
if may_divide:
match = division_re.match(source, pos)
token_type = 'operator'
else:
match = regex_re.match(source, pos)
token_type = 'regexp'
if match is None:
# woops. invalid syntax. jump one char ahead and try again.
pos += 1
continue
token_value = match.group()
if token_type is not None:
token = Token(token_type, token_value, lineno)
may_divide = indicates_division(token)
yield token
lineno += len(line_re.findall(token_value))
pos = match.end()
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