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  <pre class="prettyprint lang-js"><span id='Ext-JSON'>/**
</span> * Modified version of [Douglas Crockford's JSON.js][dc] that doesn't
 * mess with the Object prototype.
 *
 * [dc]: http://www.json.org/js.html
 *
 * @singleton
 */
Ext.JSON = (new(function() {
    var me = this,
    encodingFunction,
    decodingFunction,
    useNative = null,
    useHasOwn = !! {}.hasOwnProperty,
    isNative = function() {
        if (useNative === null) {
            useNative = Ext.USE_NATIVE_JSON &amp;&amp; window.JSON &amp;&amp; JSON.toString() == '[object JSON]';
        }
        return useNative;
    },
    pad = function(n) {
        return n &lt; 10 ? &quot;0&quot; + n : n;
    },
    doDecode = function(json) {
        return eval(&quot;(&quot; + json + ')');
    },
    doEncode = function(o, newline) {
        // http://jsperf.com/is-undefined
        if (o === null || o === undefined) {
            return &quot;null&quot;;
        } else if (Ext.isDate(o)) {
            return Ext.JSON.encodeDate(o);
        } else if (Ext.isString(o)) {
            return Ext.JSON.encodeString(o);
        } else if (typeof o == &quot;number&quot;) {
            //don't use isNumber here, since finite checks happen inside isNumber
            return isFinite(o) ? String(o) : &quot;null&quot;;
        } else if (Ext.isBoolean(o)) {
            return String(o);
        }
        // Allow custom zerialization by adding a toJSON method to any object type.
        // Date/String have a toJSON in some environments, so check these first.
        else if (o.toJSON) {
            return o.toJSON();
        } else if (Ext.isArray(o)) {
            return encodeArray(o, newline);
        } else if (Ext.isObject(o)) {
            return encodeObject(o, newline);
        } else if (typeof o === &quot;function&quot;) {
            return &quot;null&quot;;
        }
        return 'undefined';
    },
    m = {
        &quot;\b&quot;: '\\b',
        &quot;\t&quot;: '\\t',
        &quot;\n&quot;: '\\n',
        &quot;\f&quot;: '\\f',
        &quot;\r&quot;: '\\r',
        '&quot;': '\\&quot;',
        &quot;\\&quot;: '\\\\',
        '\x0b': '\\u000b' //ie doesn't handle \v
    },
    charToReplace = /[\\\&quot;\x00-\x1f\x7f-\uffff]/g,
    encodeString = function(s) {
        return '&quot;' + s.replace(charToReplace, function(a) {
            var c = m[a];
            return typeof c === 'string' ? c : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
        }) + '&quot;';
    },

    //&lt;debug&gt;
    encodeArrayPretty = function(o, newline) {
        var len = o.length,
            cnewline = newline + '   ',
            sep = ',' + cnewline,
            a = [&quot;[&quot;, cnewline], // Note newline in case there are no members
            i;

        for (i = 0; i &lt; len; i += 1) {
            a.push(Ext.JSON.encodeValue(o[i], cnewline), sep);
        }

        // Overwrite trailing comma (or empty string)
        a[a.length - 1] = newline + ']';

        return a.join('');
    },

    encodeObjectPretty = function(o, newline) {
        var cnewline = newline + '   ',
            sep = ',' + cnewline,
            a = [&quot;{&quot;, cnewline], // Note newline in case there are no members
            i;

        for (i in o) {
            if (!useHasOwn || o.hasOwnProperty(i)) {
                a.push(Ext.JSON.encodeValue(i) + ': ' + Ext.JSON.encodeValue(o[i], cnewline), sep);
            }
        }

        // Overwrite trailing comma (or empty string)
        a[a.length - 1] = newline + '}';

        return a.join('');
    },
    //&lt;/debug&gt;

    encodeArray = function(o, newline) {
        //&lt;debug&gt;
        if (newline) {
            return encodeArrayPretty(o, newline);
        }
        //&lt;/debug&gt;

        var a = [&quot;[&quot;, &quot;&quot;], // Note empty string in case there are no serializable members.
            len = o.length,
            i;
        for (i = 0; i &lt; len; i += 1) {
            a.push(Ext.JSON.encodeValue(o[i]), ',');
        }
        // Overwrite trailing comma (or empty string)
        a[a.length - 1] = ']';
        return a.join(&quot;&quot;);
    },

    encodeObject = function(o, newline) {
        //&lt;debug&gt;
        if (newline) {
            return encodeObjectPretty(o, newline);
        }
        //&lt;/debug&gt;

        var a = [&quot;{&quot;, &quot;&quot;], // Note empty string in case there are no serializable members.
            i;
        for (i in o) {
            if (!useHasOwn || o.hasOwnProperty(i)) {
                a.push(Ext.JSON.encodeValue(i), &quot;:&quot;, Ext.JSON.encodeValue(o[i]), ',');
            }
        }
        // Overwrite trailing comma (or empty string)
        a[a.length - 1] = '}';
        return a.join(&quot;&quot;);
    };
    
<span id='Ext-JSON-method-encodeString'>    /**
</span>     * Encodes a String. This returns the actual string which is inserted into the JSON string as the literal
     * expression. **The returned value includes enclosing double quotation marks.**
     *
     * To override this:
     *
     *     Ext.JSON.encodeString = function(s) {
     *         return 'Foo' + s;
     *     };
     *
     * @param {String} s The String to encode
     * @return {String} The string literal to use in a JSON string.
     * @method
     */
    me.encodeString = encodeString;

<span id='Ext-JSON-method-encodeValue'>    /**
</span>     * The function which {@link #encode} uses to encode all javascript values to their JSON representations
     * when {@link Ext#USE_NATIVE_JSON} is `false`.
     * 
     * This is made public so that it can be replaced with a custom implementation.
     *
     * @param {Object} o Any javascript value to be converted to its JSON representation
     * @return {String} The JSON representation of the passed value.
     * @method
     */
    me.encodeValue = doEncode;

<span id='Ext-JSON-method-encodeDate'>    /**
</span>     * 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 `&quot;yyyy-mm-ddThh:mm:ss&quot;`.
     *
     * To override this:
     *
     *     Ext.JSON.encodeDate = function(d) {
     *         return Ext.Date.format(d, '&quot;Y-m-d&quot;');
     *     };
     *
     * @param {Date} d The Date to encode
     * @return {String} The string literal to use in a JSON string.
     */
    me.encodeDate = function(o) {
        return '&quot;' + o.getFullYear() + &quot;-&quot;
        + pad(o.getMonth() + 1) + &quot;-&quot;
        + pad(o.getDate()) + &quot;T&quot;
        + pad(o.getHours()) + &quot;:&quot;
        + pad(o.getMinutes()) + &quot;:&quot;
        + pad(o.getSeconds()) + '&quot;';
    };

<span id='Ext-JSON-method-encode'>    /**
</span>     * Encodes an Object, Array or other value.
     * 
     * If the environment's native JSON encoding is not being used ({@link Ext#USE_NATIVE_JSON} is not set,
     * or the environment does not support it), then ExtJS's encoding will be used. This allows the developer
     * to add a `toJSON` method to their classes which need serializing to return a valid JSON representation
     * of the object.
     * 
     * @param {Object} o The variable to encode
     * @return {String} The JSON string
     */
    me.encode = function(o) {
        if (!encodingFunction) {
            // setup encoding function on first access
            encodingFunction = isNative() ? JSON.stringify : me.encodeValue;
        }
        return encodingFunction(o);
    };

<span id='Ext-JSON-method-decode'>    /**
</span>     * 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=false] True to return null, false to throw an exception if the JSON is invalid.
     * @return {Object} The resulting object
     */
    me.decode = function(json, safe) {
        if (!decodingFunction) {
            // setup decoding function on first access
            decodingFunction = isNative() ? JSON.parse : doDecode;
        }
        try {
            return decodingFunction(json);
        } catch (e) {
            if (safe === true) {
                return null;
            }
            Ext.Error.raise({
                sourceClass: &quot;Ext.JSON&quot;,
                sourceMethod: &quot;decode&quot;,
                msg: &quot;You're trying to decode an invalid JSON String: &quot; + json
            });
        }
    };
})());
<span id='Ext-method-encode'>/**
</span> * Shorthand for {@link Ext.JSON#encode}
 * @member Ext
 * @method encode
 * @inheritdoc Ext.JSON#encode
 */
Ext.encode = Ext.JSON.encode;
<span id='Ext-method-decode'>/**
</span> * Shorthand for {@link Ext.JSON#decode}
 * @member Ext
 * @method decode
 * @inheritdoc Ext.JSON#decode
 */
Ext.decode = Ext.JSON.decode;</pre>
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