Experimental parser: better escaping

tools/lexer_generator/rule_parser.py

 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 132 matching lines @@
                   | regex_alias modifier'''
     modifier = p[len(p)-1]
     graph = p[2] if len(p) == 5 else p[1]
     if modifier:
       p[0] = NfaBuilder.apply_modifier(modifier, graph)
     else:
       p[0] = graph
 
   def p_regex_string_literal(self, p):
     'regex_string_literal : STRING'
+    string = p[1][1:-1]
     escape_char = lambda string, char: string.replace(char, "\\" + char)
-    string = reduce(escape_char, "\+?*|.[](){}", p[1][1:-1])
+    string = reduce(escape_char, "+?*|.[](){}", string).replace("\\\"", "\"")
     p[0] = RegexParser.parse(string)
 
   def p_regex(self, p):
     'regex : REGEX'
     p[0] = RegexParser.parse(p[1][1:-1])
 
   def p_regex_class(self, p):
     'regex_class : CHARACTER_CLASS_REGEX'
     p[0] = RegexParser.parse(p[1])
 
@@ skipping 39 matching lines @@
       parser.build()
       RuleParser.__static_instance = parser
     parser.__state = parser_state
     try:
       parser.parser.parse(data, lexer=parser.lexer.lexer)
     except Exception:
       RuleParser.__static_instance = None
       raise
     parser.__state = None
     assert parser_state.transitions <= set(parser_state.rules.keys())