/*--------------------------------------------------------
 * Copyright © 2009 – 2010* France Telecom
 * This software is distributed under the "Simplified BSD license",
 * the text of which is available at http://www.winktoolkit.org/licence.txt
 * or see the "license.txt" file for more details.
 *--------------------------------------------------------*/

/**
 * JSON utility
 * 
 * @methods:
 * 	--> parse: Test the validity of a JSON structure and evaluate it
 * 	--> concat: Concatenate the given JSON structures
 * 
 * @compatibility:
 * 	--> Iphone OS2, Iphone OS3, Iphone OS4, Android 1.1, Android 1.5, Android 2.1, Android 2.2, Android 2.3, BlackBerry 6, Bada 1.0
 * 
 * @author:
 * 	--> Jerome GIRAUD
 */

(function(wink) {
	
var windowJson = window.JSON;

wink.json = 
{
	/**
	 * Test the validity of a JSON structure and evaluate it
	 * Follow the JSON.org implementation
	 * 
	 * @parameters
	 * 	--> str: the string to evaluate
	 */
	parse: function(str)
	{
		if (wink.isSet(windowJson) && wink.isSet(windowJson.parse))
		{
			return windowJson.parse(str);
		} else
		{
			var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
     
			str = String(str);
			
			cx.lastIndex = 0;
		    
			if (cx.test(str))
			{
				str = str.replace(cx, function(a)
				{
		            return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
		        });
		    }
	    
		    if (/^[\],:{}\s]*$/.test(str.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').replace(/(?:^|:|,)(?:\s*\[)+/g, '')))
		    {
		    	var JSON = eval('(' + str + ')');
		    }
	    
		    return JSON;
		}
	},
	/**
	 * Concatenate the given JSON structures
	 * 
	 * @parameters
	 * 	--> obj1: the object that will be updated with the second
	 * 	--> obj2: the object that will be concatenated to the first
	 */
	concat: function(obj1, obj2)
	{
		for (var key in obj2)
		{
			obj1[key] = obj2[key];
		}
	}
};

//Bindings
wink.parseJSON = wink.bind(wink.json.parse, wink.json);
wink.mixin = wink.bind(wink.json.concat, wink.json);

})(wink);