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jquery.JSON.js (4617B)

      1 /*
      2  * This document is licensed as free software under the terms of the
      3  * MIT License: <a href="http://www.opensource.org/licenses/mit-license.php" title="http://www.opensource.org/licenses/mit-license.php">http://www.opensource.org/licenses/mit-license.php</a>
      4  *
      5  * Adapted by Rahul Singla.
      6  *
      7  * Brantley Harris wrote this plugin. It is based somewhat on the JSON.org 
      8  * website's <a href="http://www.json.org/json2.js" title="http://www.json.org/json2.js">http://www.json.org/json2.js</a>, which proclaims:
      9  * "NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.", a sentiment that
     10  * I uphold.
     11  *
     12  * It is also influenced heavily by MochiKit's serializeJSON, which is 
     13  * copyrighted 2005 by Bob Ippolito.
     14  */
     15 
     16 /**
     17  * jQuery.JSON.encode( json-serializble ) Converts the given argument into a
     18  * JSON respresentation.
     19  * 
     20  * If an object has a "toJSON" function, that will be used to get the
     21  * representation. Non-integer/string keys are skipped in the object, as are
     22  * keys that point to a function.
     23  * 
     24  * json-serializble: The *thing* to be converted.
     25  */
     26 jQuery.JSON = {
     27 	encode: function(o) {
     28 		if (typeof (JSON) == 'object' && JSON.stringify)
     29 			return JSON.stringify(o);
     30 
     31 		var type = typeof (o);
     32 
     33 		if (o === null)
     34 			return "null";
     35 
     36 		if (type == "undefined")
     37 			return undefined;
     38 
     39 		if (type == "number" || type == "boolean")
     40 			return o + "";
     41 
     42 		if (type == "string")
     43 			return this.quoteString(o);
     44 
     45 		if (type == 'object') {
     46 			if (typeof o.toJSON == "function")
     47 				return this.encode(o.toJSON());
     48 
     49 			if (o.constructor === Date) {
     50 				var month = o.getUTCMonth() + 1;
     51 				if (month < 10)
     52 					month = '0' + month;
     53 
     54 				var day = o.getUTCDate();
     55 				if (day < 10)
     56 					day = '0' + day;
     57 
     58 				var year = o.getUTCFullYear();
     59 
     60 				var hours = o.getUTCHours();
     61 				if (hours < 10)
     62 					hours = '0' + hours;
     63 
     64 				var minutes = o.getUTCMinutes();
     65 				if (minutes < 10)
     66 					minutes = '0' + minutes;
     67 
     68 				var seconds = o.getUTCSeconds();
     69 				if (seconds < 10)
     70 					seconds = '0' + seconds;
     71 
     72 				var milli = o.getUTCMilliseconds();
     73 				if (milli < 100)
     74 					milli = '0' + milli;
     75 				if (milli < 10)
     76 					milli = '0' + milli;
     77 
     78 				return '"' + year + '-' + month + '-' + day + 'T' + hours + ':'
     79 						+ minutes + ':' + seconds + '.' + milli + 'Z"';
     80 			}
     81 
     82 			if (o.constructor === Array) {
     83 				var ret = [];
     84 				for ( var i = 0; i < o.length; i++)
     85 					ret.push(this.encode(o[i]) || "null");
     86 
     87 				return "[" + ret.join(",") + "]";
     88 			}
     89 
     90 			var pairs = [];
     91 			for ( var k in o) {
     92 				var name;
     93 				var type = typeof k;
     94 
     95 				if (type == "number")
     96 					name = '"' + k + '"';
     97 				else if (type == "string")
     98 					name = this.quoteString(k);
     99 				else
    100 					continue; // skip non-string or number keys
    101 
    102 				if (typeof o[k] == "function")
    103 					continue; // skip pairs where the value is a function.
    104 
    105 				var val = this.encode(o[k]);
    106 
    107 				pairs.push(name + ":" + val);
    108 			}
    109 
    110 			return "{" + pairs.join(", ") + "}";
    111 		}
    112 	},
    113 
    114 	/**
    115 	 * jQuery.JSON.decode(src) Evaluates a given piece of json source.
    116 	 */
    117 	decode: function(src) {
    118 		if (typeof (JSON) == 'object' && JSON.parse)
    119 			return JSON.parse(src);
    120 		return eval("(" + src + ")");
    121 	},
    122 
    123 	/**
    124 	 * jQuery.JSON.decodeSecure(src) Evals JSON in a way that is *more* secure.
    125 	 */
    126 	decodeSecure: function(src) {
    127 		if (typeof (JSON) == 'object' && JSON.parse)
    128 			return JSON.parse(src);
    129 
    130 		var filtered = src;
    131 		filtered = filtered.replace(/\\["\\\/bfnrtu]/g, '@');
    132 		filtered = filtered
    133 				.replace(
    134 						/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,
    135 						']');
    136 		filtered = filtered.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
    137 
    138 		if (/^[\],:{}\s]*$/.test(filtered))
    139 			return eval("(" + src + ")");
    140 		else
    141 			throw new SyntaxError("Error parsing JSON, source is not valid.");
    142 	},
    143 
    144 	/**
    145 	 * jQuery.JSON.quoteString(string) Returns a string-repr of a string, escaping
    146 	 * quotes intelligently. Mostly a support function for JSON.encode.
    147 	 * 
    148 	 * Examples: >>> jQuery.JSON.quoteString("apple") "apple"
    149 	 * 
    150 	 * >>> jQuery.JSON.quoteString('"Where are we going?", she asked.') "\"Where
    151 	 * are we going?\", she asked."
    152 	 */
    153 	quoteString: function(string) {
    154 		if (string.match(this._escapeable)) {
    155 			return '"' + string.replace(this._escapeable, function(a) {
    156 				var c = this._meta[a];
    157 				if (typeof c === 'string')
    158 					return c;
    159 				c = a.charCodeAt();
    160 				return '\\u00' + Math.floor(c / 16).toString(16)
    161 						+ (c % 16).toString(16);
    162 			}) + '"';
    163 		}
    164 		return '"' + string + '"';
    165 	},
    166 
    167 	_escapeable: /["\\\x00-\x1f\x7f-\x9f]/g,
    168 
    169 	_meta: {
    170 		'\b': '\\b',
    171 		'\t': '\\t',
    172 		'\n': '\\n',
    173 		'\f': '\\f',
    174 		'\r': '\\r',
    175 		'"': '\\"',
    176 		'\\': '\\\\'
    177 	}
    178 }