X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/0494b8d9b9bb03ab6c22b34dae81261e3cd7e3e6..7a654f8d43fdb43d78b63d90528bed6e86b608cc:/src/core/src/misc/JSON.js diff --git a/src/core/src/misc/JSON.js b/src/core/src/misc/JSON.js new file mode 100644 index 00000000..356371b6 --- /dev/null +++ b/src/core/src/misc/JSON.js @@ -0,0 +1,175 @@ +/** + * @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(""); + }; + + /** + *
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:
+ Ext.JSON.encodeDate = function(d) {
+ return d.format('"Y-m-d"');
+ };
+
+ * @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;
+