Experimental parser: cleanup logging

tools/lexer_generator/regex_parser.py

 # Copyright 2013 the V8 project authors. All rights reserved.
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 # 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.
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 #       copyright notice, this list of conditions and the following
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 #       with the distribution.
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 #
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 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+import logging
 import ply.lex as lex
 import ply.yacc as yacc
 from term import Term
 from nfa_builder import NfaBuilder
-
-class ParserBuilder:
-
-  class Logger(object):
-    def debug(self,msg,*args,**kwargs):
-      pass
-
-    def info(self,msg,*args,**kwargs):
-      pass
-
-    def warning(self,msg,*args,**kwargs):
-      raise Exception("warning: "+ (msg % args) + "\n")
-
-    def error(self,msg,*args,**kwargs):
-      raise Exception("error: "+ (msg % args) + "\n")
-
-  __static_instances = {}
-  @staticmethod
-  def parse(
-      string, name, new_lexer, new_parser, preparse = None, postparse = None):
-    if not name in ParserBuilder.__static_instances:
-      logger = ParserBuilder.Logger()
-      lexer_instance = new_lexer()
-      lexer_instance.lex = lex.lex(module=lexer_instance)
-      instance = new_parser()
-      instance.yacc = yacc.yacc(
-        module=instance, debug=True, write_tables=0,
-        debuglog=logger, errorlog=logger)
-      ParserBuilder.__static_instances[name] = (lexer_instance, instance)
-    (lexer_instance, instance) = ParserBuilder.__static_instances[name]
-    if preparse:
-      preparse(instance)
-    try:
-      return_value = instance.yacc.parse(string, lexer=lexer_instance.lex)
-    except Exception:
-      del ParserBuilder.__static_instances[name]
-      raise
-    if postparse:
-      postparse(instance)
-    return return_value
+from ply_utilities import ParserBuilder
 
 def build_escape_map(chars):
   def add_escape(d, char):
     d['\\' + char] = char
     return d
   return reduce(add_escape, chars,
     {'\\t' : '\t', '\\r' : '\r', '\\n' : '\n', '\\v' : '\v', '\\f' : '\f'})
 
 class RegexLexer:
 
@@ skipping 202 matching lines @@
   @staticmethod
   def __cat(left, right):
     assert left
     return NfaBuilder.cat_terms([left] if not right else [left, right])
 
   @staticmethod
   def parse(string):
     new_lexer = lambda: RegexLexer()
     new_parser = lambda: RegexParser()
     return ParserBuilder.parse(string, "RegexParser", new_lexer, new_parser)