jQuery.json.js

/*
2	* jQuery JSON Plugin
3	* version: 1.0 (2008-04-17)
4	*
5	* This document is licensed as free software under the terms of the
6	* MIT License: http://www.opensource.org/licenses/mit-license.php
7	*
8	* Brantley Harris technically wrote this plugin, but it is based somewhat
9	* on the JSON.org website's http://www.json.org/json2.js, which proclaims:
10	* "NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.", a sentiment that
11	* I uphold.  I really just cleaned it up.
12	*
13	* It is also based heavily on MochiKit's serializeJSON, which is
14	* copywrited 2005 by Bob Ippolito.
15	*/
16
17	(function($) {
18	function toIntegersAtLease(n)
19	// Format integers to have at least two digits.
20	{
21	return n < 10 ? '0' + n : n;
22	}
23
24	Date.prototype.toJSON = function(date)
25	// Yes, it polutes the Date namespace, but we'll allow it here, as
26	// it's damned usefull.
27	{
28	return this.getUTCFullYear()   + '-' +
29	toIntegersAtLease(this.getUTCMonth()) + '-' +
30	toIntegersAtLease(this.getUTCDate());
31	};
32
33	var escapeable = /["\\\x00-\x1f\x7f-\x9f]/g;
34	var meta = {    // table of character substitutions
35	'\b': '\\b',
36	'\t': '\\t',
37	'\n': '\\n',
38	'\f': '\\f',
39	'\r': '\\r',
40	'"' : '\\"',
41	'\\': '\\\\'
42	};
43
44	$.quoteString = function(string)
45	// Places quotes around a string, inteligently.
46	// If the string contains no control characters, no quote characters, and no
47	// backslash characters, then we can safely slap some quotes around it.
48	// Otherwise we must also replace the offending characters with safe escape
49	// sequences.
50	{
51	if (escapeable.test(string))
52	{
53	return '"' + string.replace(escapeable, function (a)
54	{
55	var c = meta[a];
56	if (typeof c === 'string') {
57	return c;
58	}
59	c = a.charCodeAt();
60	return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);
61	}) + '"';
62	}
63	return '"' + string + '"';
64	};
65
66	$.toJSON = function(o, compact)
67	{
68	var type = typeof(o);
69
70	if (type == "undefined")
71	return "undefined";
72	else if (type == "number" || type == "boolean")
73	return o + "";
74	else if (o === null)
75	return "null";
76
77	// Is it a string?
78	if (type == "string")
79	{
80	return $.quoteString(o);
81	}
82
83	// Does it have a .toJSON function?
84	if (type == "object" && typeof o.toJSON == "function")
85	return o.toJSON(compact);
86
87	// Is it an array?
88	if (type != "function" && typeof(o.length) == "number")
89	{
90	var ret = [];
91	for (var i = 0; i < o.length; i++) {
92	ret.push( $.toJSON(o[i], compact) );
93	}
94	if (compact)
95	return "[" + ret.join(",") + "]";
96	else
97	return "[" + ret.join(", ") + "]";
98	}
99
100	// If it's a function, we have to warn somebody!
101	if (type == "function") {
102	throw new TypeError("Unable to convert object of type 'function' to json.");
103	}
104
105	// It's probably an object, then.
106	var ret = [];
107	for (var k in o) {
108	var name;
109	type = typeof(k);
110
111	if (type == "number")
112	name = '"' + k + '"';
113	else if (type == "string")
114	name = $.quoteString(k);
115	else
116	continue;  //skip non-string or number keys
117
118	var val = $.toJSON(o[k], compact);
119	if (typeof(val) != "string") {
120	// skip non-serializable values
121	continue;
122	}
123
124	if (compact)
125	ret.push(name + ":" + val);
126	else
127	ret.push(name + ": " + val);
128	}
129	return "{" + ret.join(", ") + "}";
130	};
131
132	$.compactJSON = function(o)
133	{
134	return $.toJSON(o, true);
135	};
136
137	$.evalJSON = function(src)
138	// Evals JSON that we know to be safe.
139	{
140	return eval("(" + src + ")");
141	};
142
143	$.secureEvalJSON = function(src)
144	// Evals JSON in a way that is *more* secure.
145	{
146	var filtered = src;
147	filtered = filtered.replace(/\\["\\\/bfnrtu]/g, '@');
148	filtered = filtered.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
149	filtered = filtered.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
150
151	if (/^[\],:{}\s]*$/.test(filtered))
152	return eval("(" + src + ")");
153	else
154	throw new SyntaxError("Error parsing JSON, source is not valid.");
155	};
156	})(jQuery);