/** * @class Ext.JSON * Modified version of Douglas Crockford"s json.js that doesn"t * mess with the Object prototype * http://www.json.org/js.html * @singleton */ Ext.JSON = new(function() { var useHasOwn = !! {}.hasOwnProperty, isNative = function() { var useNative = null; return function() { if (useNative === null) { useNative = Ext.USE_NATIVE_JSON && window.JSON && JSON.toString() == '[object JSON]'; } return useNative; }; }(), pad = function(n) { return n < 10 ? "0" + n : n; }, doDecode = function(json) { return eval("(" + json + ')'); }, doEncode = function(o) { if (!Ext.isDefined(o) || o === null) { return "null"; } else if (Ext.isArray(o)) { return encodeArray(o); } else if (Ext.isDate(o)) { return Ext.JSON.encodeDate(o); } else if (Ext.isString(o)) { return encodeString(o); } else if (typeof o == "number") { //don't use isNumber here, since finite checks happen inside isNumber return isFinite(o) ? String(o) : "null"; } else if (Ext.isBoolean(o)) { return String(o); } else if (Ext.isObject(o)) { return encodeObject(o); } else if (typeof o === "function") { return "null"; } }, m = { "\b": '\\b', "\t": '\\t', "\n": '\\n', "\f": '\\f', "\r": '\\r', '"': '\\"', "\\": '\\\\', '\x0b': '\\u000b' //ie doesn't handle \v }, charToReplace = /[\\\"\x00-\x1f\x7f-\uffff]/g, encodeString = function(s) { return '"' + s.replace(charToReplace, function(a) { var c = m[a]; return typeof c === 'string' ? c : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); }) + '"'; }, encodeArray = function(o) { var a = ["[", ""], // Note empty string in case there are no serializable members. len = o.length, i; for (i = 0; i < len; i += 1) { a.push(doEncode(o[i]), ','); } // Overwrite trailing comma (or empty string) a[a.length - 1] = ']'; return a.join(""); }, encodeObject = function(o) { var a = ["{", ""], // Note empty string in case there are no serializable members. i; for (i in o) { if (!useHasOwn || o.hasOwnProperty(i)) { a.push(doEncode(i), ":", doEncode(o[i]), ','); } } // Overwrite trailing comma (or empty string) a[a.length - 1] = '}'; return a.join(""); }; /** *Encodes a Date. This returns the actual string which is inserted into the JSON string as the literal expression. * The returned value includes enclosing double quotation marks.
*The default return format is "yyyy-mm-ddThh:mm:ss".
*To override this:
* @param {Date} d The Date to encode * @return {String} The string literal to use in a JSON string. */ this.encodeDate = function(o) { return '"' + o.getFullYear() + "-" + pad(o.getMonth() + 1) + "-" + pad(o.getDate()) + "T" + pad(o.getHours()) + ":" + pad(o.getMinutes()) + ":" + pad(o.getSeconds()) + '"'; }; /** * Encodes an Object, Array or other value * @param {Mixed} o The variable to encode * @return {String} The JSON string */ this.encode = function() { var ec; return function(o) { if (!ec) { // setup encoding function on first access ec = isNative() ? JSON.stringify : doEncode; } return ec(o); }; }(); /** * Decodes (parses) a JSON string to an object. If the JSON is invalid, this function throws a SyntaxError unless the safe option is set. * @param {String} json The JSON string * @return {Object} The resulting object */ this.decode = function() { var dc; return function(json) { if (!dc) { // setup decoding function on first access dc = isNative() ? JSON.parse : doDecode; } return dc(json); }; }(); })(); /** * Shorthand for {@link Ext.JSON#encode} * @param {Mixed} o The variable to encode * @return {String} The JSON string * @member Ext * @method encode */ Ext.encode = Ext.JSON.encode; /** * Shorthand for {@link Ext.JSON#decode} * @param {String} json The JSON string * @param {Boolean} safe (optional) Whether to return null or throw an exception if the JSON is invalid. * @return {Object} The resulting object * @member Ext * @method decode */ Ext.decode = Ext.JSON.decode;Ext.JSON.encodeDate = function(d) { return d.format('"Y-m-d"'); };