Improve ScanJsonNumber.

src/parser.cc

 // Copyright 2010 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 3923 matching lines @@
   } else {
     return Factory::NewStringFromTwoByte(scanner_.literal_uc16_string());
   }
 }
 
 
 // Parse any JSON value.
 Handle<Object> JsonParser::ParseJsonValue() {
   Token::Value token = scanner_.Next();
   switch (token) {
-    case Token::STRING: {
+    case Token::STRING:
       return GetString();
-    }
-    case Token::NUMBER: {
-      ASSERT(scanner_.is_literal_ascii());
-      double value = StringToDouble(scanner_.literal_ascii_string(),
-                                    NO_FLAGS,  // Hex, octal or trailing junk.
-                                    OS::nan_value());
-      return Factory::NewNumber(value);
-    }
+    case Token::NUMBER:
+      return Factory::NewNumber(scanner_.number());
     case Token::FALSE_LITERAL:
       return Factory::false_value();
     case Token::TRUE_LITERAL:
       return Factory::true_value();
     case Token::NULL_LITERAL:
       return Factory::null_value();
     case Token::LBRACE:
       return ParseJsonObject();
     case Token::LBRACK:
       return ParseJsonArray();
@@ skipping 1062 matching lines @@
       Handle<String> source = Handle<String>(String::cast(script->source()));
       result = parser.ParseProgram(source, info->is_global());
     }
   }
 
   info->SetFunction(result);
   return (result != NULL);
 }
 
 } }  // namespace v8::internal