Debug.Log a JSON array

Question

Hi guys,

I have a JSON parser in my game which can be found here:

http://wiki.unity3d.com/index.php?title=JSONParse

It works PERFECTLY but the problem is that Debug.Log() doesn't Log all objects in the JSON array.

What I would like to know is how I can Debug.Log a JSON array (kind of the same way that PHP uses var_dump() ).

The code I use:

 function Save(data)
 {
     Debug.Log(data); // --> data#
     _Data = JSONParse.JSONParse(data);
     Debug.Log(_Data); // --> returns: Boo.Lang.Hash
     for (fields in _Data)
     {
         Debug.Log(fields); // --> returns: System.Collections.DictionaryEntry
         for (field in fields)
         {
             Debug.Log(field); // --> returns: error#
         }
     }
 }

data# : {"server":{"connected":true,"name":"Test Server","error":false}}

error# : ApplicationException: Argument is not enumerable (does not implement System.Collections.IEnumerable). Boo.Lang.Runtime.RuntimeServices.GetEnumerable

Answer 1

"a JSON object" isn't a very clear thing in Unity since there is nothing like that. You use a JSON Parser which "probably" converts the JSON string into a Dictionary and Array / List representation. If the types this parser uses doesn't implement such a function, you can't simply "print" it's content.

It seems GitHub is down for maintanance at the moment so i can't take a look at the parser, but it seems _Data contains just a dictionary (HashTable). when you iterate over a hachtable you will get DictionaryEntry which have a Key and a Value.

This should work:

 for (field in _Data)
 {
     Debug.Log(field.Key + " = " + field.Value);
 }

edit

Well, it seems he's using a Hashtable and the ArrayList class. If you want to "iterate" through the whole structure you have to write a recursive function that processes each item seperately and test for the type. I never use UnityScript, so i can't offer an example. I've written a simple JSON parser / builder in C# but haven't posted it on the wiki yet. I will post it the other day, but these days i don't have much time ;) Actually it's 03:15 again and i should go to bed now ;)

My parser uses strong typed classes and each "Node" can be rebuilded as a JSON string. I recently improved the usage and added a custom binary serialisation / deserialization with optional BZip2(using SharpZipLib) compression and Base64 encode

Before i can post it to the wiki i have to create some examples and have to test if and how all of it's features work in UnityScript as well.

edit(2012.12.30)
I finally posted my SimpleJSON framework to the wiki.

Answer 2

Here is the JSON Parser, since gitgub is offline:

 /*
 
 JSONParse.js
 A JSON Parser for the Unity Game Engine
  
 Based on json_parse by Douglas Crockford
 Ported by Philip Peterson (ironmagma/ppeterson)
 
 */
 
 
 
 private static var at : int;
 
 private static var ch : String;
 
 private static var escapee = {
             "\"": "\"",
             "\\": "\\",
             "/": "/",
             "b": "b",
             "f": "\f",
             "n": "\n",
             "r": "\r",
             "t": "\t"
             };
             
 private static var text : String;
 
 private static function error (m) : void {
     throw new System.Exception("SyntaxError: \nMessage: "+m+
                         "\nAt: "+at+
                         "\nText: "+text);
 }
 
 private static function next (c) : System.String {
 
     if(c && c != ch) {
         error("Expected '" + c + "' instead of '" + ch + "'");
     }
     
     
     if(text.length >= at+1) {
         ch = text.Substring(at, 1);
     }
     else {
         ch = "";
     }
     
     at++;
     return ch;
     
 }
 
 private static function next () {
     return next(null);
 }
 
 private static function number () : Number {
     var number;
     var string = "";
     
     if(ch == "-") {
         string = "-";
         next("-");
     }
     while(ch in ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]) {
         string += ch;
         next();
     }
     if(ch == ".") {
         string += ".";
         while(next() && ch in ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]) {
             string += ch;
         }
     }
     if(ch == "e" || ch == "E") {
         string += ch;
         next();
         if(ch == "-" || ch == "+") {
             string += ch;
             next();
         }
         while(ch in ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]) {
             string += ch;
             next();
         }
     }
     number = Number.Parse(string);
     
     if (System.Double.IsNaN(number)) {
         error("Bad number");
     } else {
         return number;
     }
     
 }
 
 
 private static function string () : System.String {
     var hex : int;
     var i : int;
     var string : String = "";
     var uffff : int;
     
     if(ch == "\"") {
         while(next()) {
             if(ch == "\"") {
                 next();
                 return string;
             } else if (ch == "\\") {
                 next();
                 if(ch == "u") {
                     uffff = 0;
                     for(i = 0; i < 4; i++) {
                         hex = System.Convert.ToInt32(next(), 16);
                         if (hex == Mathf.Infinity || hex == Mathf.NegativeInfinity) {
                             break;
                         }
                         uffff = uffff * 16 + hex;
                     }
                     var m : char = uffff;
                     string += m;
                 } else if(ch in escapee) {
                     string += escapee[ch];
                 } else {
                     break;
                 }
             } else {
                 string += ch;
             }
         }
     }
     error("Bad string");
 };
 
 
 
 private static function white () : void {
     while(ch && (ch.length >= 1 && ch.Chars[0] <= 32)) { // if it's whitespace
         next();
     }   
 }
 
 private static function value () : System.Object {
     white();
     // Again, we have to pass on the switch() statement.
     
     if(ch == "{") {
         return object();
     } else if(ch == "[") {
         return array();
     } else if(ch == "\"") {
         return string();
     } else if(ch == "-") {
         return number();
     } else {
         return (ch in ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]) ? number() : word();
     }
     
 };
 
 private static function word () {
     // We don't use a switch() statement because
     // otherwise Unity will complain about
     // unreachable code (in reality it's not unreachable).
     
     if(ch == "t") {
         next("t");
         next("r");
         next("u");
         next("e");
         return true;
     } else if (ch == "f") {
         next("f");
         next("a");
         next("l");
         next("s");
         next("e");
         return false;
     } else if (ch == "n") {
         next("n");
         next("u");
         next("l");
         next("l");
         return null;
     } else if (ch == "") { 
         return null; // Todo: why is it doing this?
     }
     
     error("Unexpected '" + ch + "'");
 }
 
 private static function array () {
     
     var array : Array = new Array();
     
     if(ch == "[") {
         next("[");
         white();
         if(ch == "]") {
             next("]");
             return array; // empty array
         }
         while(ch) {
             array.Push(value());
             white();
             if(ch == "]") {
                 next("]");
                 return array;
             }
             next(",");
             white();
         }
     }
     error("Bad array");
 };
 
 private static function object () {
     
     var key;
     var object = {};
     
     if(ch == "{") {
         next("{");
         white();
         if(ch == "}") {
             next("}");
             return object; // empty object
         }
         while(ch) {
             key = string();
             white();
             next(":");
             object[key] = value();
             white();
             if (ch == "}") {
                 next("}");
                 return object;
             }
             next(",");
             white();
         }
     }
     error("Bad object");
 }
 
 
 
 public static function JSONParse (source, reviver) {
     var result;
     
     text = source;
     at = 0;
     ch = " ";
     result = value();
     white();
     if (ch) {
         error("Syntax error");
     }
 
     return result;
     
 }
 
 public static function JSONParse (source) {
     return JSONParse(source, null);
 }

Debug.Log a JSON array

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