Unexpected parse errors

[Peter Hug]

I built jsontest and tried to parse a JSON file that parses perfectly using JSON for ruby but causes escape errors in json-cpp.

[code]
{
  "MetaDatabaseList":
  [
    {
      "Attributes":
      {
        "TargetRDBMS":"SQLServer",
        "Alias":"APAL3DB",
        "ProsaName":"APAL3 Database",
        "Description":"APAL3 Database",
        "Driver":"{SQL Server}",
        "Server":"Athena\u005CSQLServer2000",
        "UserID":"onlyme",
        "UserPWD":"woteva",
        "Name":"APAL3_600_APAL3",
        "DataFilePath":"E:\u005CAPAL3\u005CData\u005CDatabases\u005CRTCIS\u005C600\u005CAPAL3_600_APAL3.mdf",
        "LogFilePath":"E:\u005CAPAL3\u005CData\u005CDatabases\u005CRTCIS\u005C600\u005CAPAL3_600_APAL3.ldf",
        "InitialSize":10,
        "MaxSize":2000,
        "GrowthSize":10,
        "VersionMajor":6,
        "VersionMinor":0,
        "VersionRevision":0,
        "AllowCreate":true,
        "HasObjectLinks":false,
        "HasVersionInfo":true
      }
    }
  ]
}
[/code]

jsontest complains about things like '{' and '\uxxxx' as in these lines:

"Driver":"{SQL Server}",
"Server":"Athena\u005CSQLServer2000",

Am I missing something?

Pete

[Peter Hug]

I managed to fix the problem. I found and a few minor problems in the HEAD code from thge CVS:

  bool Reader::decodeString( Token &token, std::string &decoded )

I simply added the following line below the comment "// @todo encode unicode as utf8." with this code:

  decoded += (char) unicode;

This works perfectly for me but I do relise that those who use unicode may end up with problems. So this does need revisiting.

Another problem was here:

  bool Reader::decodeUnicodeEscapeSequence(Token &token,
                                           Location &current,
                                           Location end,
                                           unsigned int &unicode )

I replaced this line:
  if ( c >= 0  &&  c <= 9 )

with:
  if ( c >= '0'  &&  c <= '9' )

Even with these changes, I still had problems in jsontest when parsing the rewritten json file. I found another encoding/decoding problem in jason_writer.cpp. The problem is that the function std::string valueToQuotedString(const char *value) fails to properly encode strings. So I replaced the entire function with the code below. Note: I'm specifically encoding the '\' as UTF-16 simply because my JSON parser for ruby doesn't understand \\ but works OK with \u005C. Of course, this is not according to RFC 4627, but I needed something that works for me.

std::string valueToQuotedString(const char *value )
{
  std::string    strOut;
  const char *   pc;
  char           buffer[20];

  strOut = '"';

  for (pc = value; *pc; pc++)
  {
    switch (*pc)
    {
    case '"':
      strOut += "\\\&quot;";
      break;

    case '\\':
      strOut += "\\u005C";
      break;

    case '/':
      strOut += "\\/";
      break;

    case '\b':
      strOut += "\\b";
      break;

    case '\f':
      strOut += "\\f";
      break;

    case '\n':
      strOut += "\\n";
      break;

    case '\r':
      strOut += "\\r";
      break;

    case '\t':
      strOut += "\\t";
      break;

    default:
      if (*pc < 0x1F)
      {
      sprintf(buffer, "\\u%04x", *pc);
      strOut += buffer;
      }
      else
      {
      strOut += *pc;
      }
    }
  }

  strOut += '"';

  return strOut;
}