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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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