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diff --git a/maintenance/cssjanus/csslex.py b/maintenance/cssjanus/csslex.py
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-#!/usr/bin/python
-#
-# Copyright 2007 Google Inc. All Rights Reserved.
-
-"""CSS Lexical Grammar rules.
-
-CSS lexical grammar from http://www.w3.org/TR/CSS21/grammar.html
-"""
-
-__author__ = ['elsigh@google.com (Lindsey Simon)',
- 'msamuel@google.com (Mike Samuel)']
-
-# public symbols
-__all__ = [ "NEWLINE", "HEX", "NON_ASCII", "UNICODE", "ESCAPE", "NMSTART", "NMCHAR", "STRING1", "STRING2", "IDENT", "NAME", "HASH", "NUM", "STRING", "URL", "SPACE", "WHITESPACE", "COMMENT", "QUANTITY", "PUNC" ]
-
-# The comments below are mostly copied verbatim from the grammar.
-
-# "@import" {return IMPORT_SYM;}
-# "@page" {return PAGE_SYM;}
-# "@media" {return MEDIA_SYM;}
-# "@charset" {return CHARSET_SYM;}
-KEYWORD = r'(?:\@(?:import|page|media|charset))'
-
-# nl \n|\r\n|\r|\f ; a newline
-NEWLINE = r'\n|\r\n|\r|\f'
-
-# h [0-9a-f] ; a hexadecimal digit
-HEX = r'[0-9a-f]'
-
-# nonascii [\200-\377]
-NON_ASCII = r'[\200-\377]'
-
-# unicode \\{h}{1,6}(\r\n|[ \t\r\n\f])?
-UNICODE = r'(?:(?:\\' + HEX + r'{1,6})(?:\r\n|[ \t\r\n\f])?)'
-
-# escape {unicode}|\\[^\r\n\f0-9a-f]
-ESCAPE = r'(?:' + UNICODE + r'|\\[^\r\n\f0-9a-f])'
-
-# nmstart [_a-z]|{nonascii}|{escape}
-NMSTART = r'(?:[_a-z]|' + NON_ASCII + r'|' + ESCAPE + r')'
-
-# nmchar [_a-z0-9-]|{nonascii}|{escape}
-NMCHAR = r'(?:[_a-z0-9-]|' + NON_ASCII + r'|' + ESCAPE + r')'
-
-# ident -?{nmstart}{nmchar}*
-IDENT = r'-?' + NMSTART + NMCHAR + '*'
-
-# name {nmchar}+
-NAME = NMCHAR + r'+'
-
-# hash
-HASH = r'#' + NAME
-
-# string1 \"([^\n\r\f\\"]|\\{nl}|{escape})*\" ; "string"
-STRING1 = r'"(?:[^\"\\]|\\.)*"'
-
-# string2 \'([^\n\r\f\\']|\\{nl}|{escape})*\' ; 'string'
-STRING2 = r"'(?:[^\'\\]|\\.)*'"
-
-# string {string1}|{string2}
-STRING = '(?:' + STRING1 + r'|' + STRING2 + ')'
-
-# num [0-9]+|[0-9]*"."[0-9]+
-NUM = r'(?:[0-9]*\.[0-9]+|[0-9]+)'
-
-# s [ \t\r\n\f]
-SPACE = r'[ \t\r\n\f]'
-
-# w {s}*
-WHITESPACE = '(?:' + SPACE + r'*)'
-
-# url special chars
-URL_SPECIAL_CHARS = r'[!#$%&*-~]'
-
-# url chars ({url_special_chars}|{nonascii}|{escape})*
-URL_CHARS = r'(?:%s|%s|%s)*' % (URL_SPECIAL_CHARS, NON_ASCII, ESCAPE)
-
-# url
-URL = r'url\(%s(%s|%s)%s\)' % (WHITESPACE, STRING, URL_CHARS, WHITESPACE)
-
-# comments
-# see http://www.w3.org/TR/CSS21/grammar.html
-COMMENT = r'/\*[^*]*\*+([^/*][^*]*\*+)*/'
-
-# {E}{M} {return EMS;}
-# {E}{X} {return EXS;}
-# {P}{X} {return LENGTH;}
-# {C}{M} {return LENGTH;}
-# {M}{M} {return LENGTH;}
-# {I}{N} {return LENGTH;}
-# {P}{T} {return LENGTH;}
-# {P}{C} {return LENGTH;}
-# {D}{E}{G} {return ANGLE;}
-# {R}{A}{D} {return ANGLE;}
-# {G}{R}{A}{D} {return ANGLE;}
-# {M}{S} {return TIME;}
-# {S} {return TIME;}
-# {H}{Z} {return FREQ;}
-# {K}{H}{Z} {return FREQ;}
-# % {return PERCENTAGE;}
-UNIT = r'(?:em|ex|px|cm|mm|in|pt|pc|deg|rad|grad|ms|s|hz|khz|%)'
-
-# {num}{UNIT|IDENT} {return NUMBER;}
-QUANTITY = '%s(?:%s%s|%s)?' % (NUM, WHITESPACE, UNIT, IDENT)
-
-# "<!--" {return CDO;}
-# "-->" {return CDC;}
-# "~=" {return INCLUDES;}
-# "|=" {return DASHMATCH;}
-# {w}"{" {return LBRACE;}
-# {w}"+" {return PLUS;}
-# {w}">" {return GREATER;}
-# {w}"," {return COMMA;}
-PUNC = r'<!--|-->|~=|\|=|[\{\+>,:;]'