IDL lexer: update integer regex to latest Web IDL spec

tools/idl_parser/idl_lexer.py

 #!/usr/bin/env python
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """ Lexer for PPAPI IDL
 
 The lexer uses the PLY library to build a tokenizer which understands both
 WebIDL and Pepper tokens.
 
@@ skipping 97 matching lines @@
   # definitions come from WebIDL.
   def t_ELLIPSIS(self, t):
     r'\.\.\.'
     return t
 
   def t_float(self, t):
     r'-?(([0-9]+\.[0-9]*|[0-9]*\.[0-9]+)([Ee][+-]?[0-9]+)?|[0-9]+[Ee][+-]?[0-9]+)'
     return t
 
   def t_integer(self, t):
-    r'-?(0([Xx][0-9A-Fa-f]+|[0-7]*)|[1-9][0-9]*)'
+    r'-?([1-9][0-9]*|0[Xx][0-9A-Fa-f]+|0[0-7]*)'
     return t
 
 
   # A line ending '\n', we use this to increment the line number
   def t_LINE_END(self, t):
     r'\n+'
     self.AddLines(len(t.value))
 
   # We do not process escapes in the IDL strings.  Strings are exclusively
   # used for attributes and enums, and not used as typical 'C' constants.
@@ skipping 141 matching lines @@
     self.keywords = {}
     self.tokens = []
     self._AddConstDefs()
     self._AddTokens(IDLLexer.tokens)
     self._AddKeywords(IDLLexer.keywords)
     self._lexobj = None
 
 # If run by itself, attempt to build the lexer
 if __name__ == '__main__':
   lexer = IDLLexer()