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+Sencha Documentation Project/**
+ * @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";
+ }
+ return 'undefined';
+ },
+ 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("");
+ };
+
+ /**
+ * <p>Encodes a Date. This returns the actual string which is inserted into the JSON string as the literal expression.
+ * <b>The returned value includes enclosing double quotation marks.</b></p>
+ * <p>The default return format is "yyyy-mm-ddThh:mm:ss".</p>
+ * <p>To override this:</p><pre><code>
+ Ext.JSON.encodeDate = function(d) {
+ return d.format('"Y-m-d"');
+ };
+ </code></pre>
+ * @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
+ * @param {Boolean} safe (optional) Whether to return null or throw an exception if the JSON is invalid.
+ * @return {Object} The resulting object
+ */
+ this.decode = function() {
+ var dc;
+ return function(json, safe) {
+ if (!dc) {
+ // setup decoding function on first access
+ dc = isNative() ? JSON.parse : doDecode;
+ }
+ try {
+ return dc(json);
+ } catch (e) {
+ if (safe === true) {
+ return null;
+ }
+ Ext.Error.raise({
+ sourceClass: "Ext.JSON",
+ sourceMethod: "decode",
+ msg: "You're trying to decode and invalid JSON String: " + 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;
+
+
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