/*
    http://www.JSON.org/json2.js
    2008-03-24

    Public Domain.

    NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.

    See http://www.JSON.org/js.html
    
    modified by Rick Strahl to support MS AJAX style
                            date formats
*/

if (!this.JSON2) {

// Create a JSON object only if one does not already exist. We create the
// object in a closure to avoid global variables.

    JSON2 = function() {
        function f(n) {    // Format integers to have at least two digits.
            return n < 10 ? '0' + n : n;
        }


        //*** RAS - removed date .toJSON for MS Ajax - string double encodes otherwise
        //        Date.prototype.toJSON = function () {
        //// Eventually, this method will be based on the date.toISOString method.
        //              
        //              // RAS MODIFIED: Return MS AJAX Style dates
        //              var xx = '"\/Date(' + this.getTime() + ')\/"';                                    
        //              return xx;
        ////            return this.getUTCFullYear()   + '-' +
        ////                 f(this.getUTCMonth() + 1) + '-' +
        ////                 f(this.getUTCDate())      + 'T' +
        ////                 f(this.getUTCHours())     + ':' +
        ////                 f(this.getUTCMinutes())   + ':' +
        ////                 f(this.getUTCSeconds())   + 'Z';
        //        };

        var escapeable = /["\\\x00-\x1f\x7f-\x9f]/g,
            gap,
            indent,
            meta = {    // table of character substitutions
                '\b': '\\b',
                '\t': '\\t',
                '\n': '\\n',
                '\f': '\\f',
                '\r': '\\r',
                '"': '\\"',
                '\\': '\\\\'
            },
            rep;

        function quote(string) {
            // If the string contains no control characters, no quote characters, and no
            // backslash characters, then we can safely slap some quotes around it.
            // Otherwise we must also replace the offending characters with safe escape
            // sequences.
            return escapeable.test(string) ?
                '"' + string.replace(escapeable, function(a) {
                    var c = meta[a];
                    if (typeof c === 'string') {
                        return c;
                    }
                    c = a.charCodeAt();
                    return '\\u00' + Math.floor(c / 16).toString(16) +
                                               (c % 16).toString(16);
                }) + '"' :
                '"' + string + '"';
        }


        function str(key, holder) {
            // Produce a string from holder[key].
            var i,          // The loop counter.
                k,          // The member key.
                v,          // The member value.
                length,
                mind = gap,
                partial,
                value = holder[key];

            // If the value has a toJSON method, call it to obtain a replacement value.

            if (value && typeof value === 'object' &&
                    typeof value.toJSON === 'function') {
                value = value.toJSON(key);
            }

            // If we were called with a replacer function, then call the replacer to
            // obtain a replacement value.

            if (typeof rep === 'function') {
                value = rep.call(holder, key, value);
            }

            // What happens next depends on the value's type.
            switch (typeof value) {
                case 'string':
                    return quote(value);
                case 'number':
                    // JSON numbers must be finite. Encode non-finite numbers as null.
                    return isFinite(value) ? String(value) : 'null';
                case 'boolean':
                case 'null':
                    // If the value is a boolean or null, convert it to a string. Note:
                    // typeof null does not produce 'null'. The case is included here in
                    // the remote chance that this gets fixed someday.
                    return String(value);

                    // If the type is 'object', we might be dealing with an object or an array or
                    // null.
                case 'object':
                    // Due to a specification blunder in ECMAScript, typeof null is 'object',
                    // so watch out for that case.
                    if (!value) {
                        return 'null';
                    }
                    // *** RAS - MS AJAX style date encoding
                    if (value.toUTCString) {
                        var xx = '"\\/Date(' + value.getTime() + ')\\/"';
                        return xx;
                    }

                    // Make an array to hold the partial results of stringifying this object value.
                    gap += indent;
                    partial = [];

                    // If the object has a dontEnum length property, we'll treat it as an array.



                    if (typeof value.length === 'number' &&

                        !(value.propertyIsEnumerable('length'))) {



                        // The object is an array. Stringify every element. Use null as a placeholder

                        // for non-JSON values.



                        length = value.length;

                        for (i = 0; i < length; i += 1) {

                            partial[i] = str(i, value) || 'null';

                        }



                        // Join all of the elements together, separated with commas, and wrap them in

                        // brackets.



                        v = partial.length === 0 ? '[]' :

                        gap ? '[\n' + gap + partial.join(',\n' + gap) +

                                  '\n' + mind + ']' :

                              '[' + partial.join(',') + ']';

                        gap = mind;

                        return v;

                    }



                    // If the replacer is an array, use it to select the members to be stringified.



                    if (typeof rep === 'object') {

                        length = rep.length;

                        for (i = 0; i < length; i += 1) {

                            k = rep[i];

                            if (typeof k === 'string') {

                                v = str(k, value, rep);

                                if (v) {

                                    partial.push(quote(k) + (gap ? ': ' : ':') + v);

                                }

                            }

                        }

                    } else {



                        // Otherwise, iterate through all of the keys in the object.



                        for (k in value) {

                            v = str(k, value, rep);

                            if (v) {

                                partial.push(quote(k) + (gap ? ': ' : ':') + v);

                            }

                        }

                    }



                    // Join all of the member texts together, separated with commas,

                    // and wrap them in braces.



                    v = partial.length === 0 ? '{}' :

                    gap ? '{\n' + gap + partial.join(',\n' + gap) +

                              '\n' + mind + '}' :

                          '{' + partial.join(',') + '}';

                    gap = mind;

                    return v;

            }

        }





        // Return the JSON object containing the stringify, parse, and quote methods.



        return {

            stringify: function(value, replacer, space) {



                // The stringify method takes a value and an optional replacer, and an optional

                // space parameter, and returns a JSON text. The replacer can be a function

                // that can replace values, or an array of strings that will select the keys.

                // A default replacer method can be provided. Use of the space parameter can

                // produce text that is more easily readable.



                var i;

                gap = '';

                indent = '';

                if (space) {



                    // If the space parameter is a number, make an indent string containing that

                    // many spaces.



                    if (typeof space === 'number') {

                        for (i = 0; i < space; i += 1) {

                            indent += ' ';

                        }



                        // If the space parameter is a string, it will be used as the indent string.



                    } else if (typeof space === 'string') {

                        indent = space;

                    }

                }



                // If there is no replacer parameter, use the default replacer.



                if (!replacer) {

                    rep = function(key, value) {

                        if (!Object.hasOwnProperty.call(this, key)) {

                            return undefined;

                        }

                        return value;

                    };



                    // The replacer can be a function or an array. Otherwise, throw an error.



                } else if (typeof replacer === 'function' ||

                        (typeof replacer === 'object' &&

                         typeof replacer.length === 'number')) {

                    rep = replacer;

                } else {

                    throw new Error('JSON.stringify');

                }



                // Make a fake root object containing our value under the key of ''.

                // Return the result of stringifying the value.



                return str('', { '': value });

            },





            parse: function(text, reviver) {



                // The parse method takes a text and an optional reviver function, and returns

                // a JavaScript value if the text is a valid JSON text.

                var j;



                function walk(holder, key) {



                    // The walk method is used to recursively walk the resulting structure so

                    // that modifications can be made.



                    var k, v, value = holder[key];

                    if (value && typeof value === 'object') {

                        for (k in value) {

                            if (Object.hasOwnProperty.call(value, k)) {

                                v = walk(value, k);

                                if (v !== undefined) {

                                    value[k] = v;

                                } else {

                                    delete value[k];

                                }

                            }

                        }

                    }

                    return reviver.call(holder, key, value);

                }





                // Parsing happens in three stages. In the first stage, we run the text against

                // regular expressions that look for non-JSON patterns. We are especially

                // concerned with '()' and 'new' because they can cause invocation, and '='

                // because it can cause mutation. But just to be safe, we want to reject all

                // unexpected forms.



                // We split the first stage into 4 regexp operations in order to work around

                // crippling inefficiencies in IE's and Safari's regexp engines. First we

                // replace all backslash pairs with '@' (a non-JSON character). Second, we

                // replace all simple value tokens with ']' characters. Third, we delete all

                // open brackets that follow a colon or comma or that begin the text. Finally,

                // we look to see that the remaining characters are only whitespace or ']' or

                // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.



                if (/^[\],:{}\s]*$/.test(text.replace(/\\["\\\/bfnrtu]/g, '@').

replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').

replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {



                    // In the second stage we use the eval function to compile the text into a

                    // JavaScript structure. The '{' operator is subject to a syntactic ambiguity

                    // in JavaScript: it can begin a block or an object literal. We wrap the text

                    // in parens to eliminate the ambiguity.





                    // *** RAS Update:  Fix up Dates: ISO and MS AJAX format support        

                    var regEx = /(\"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}.*?\")|(\"\\*\/Date\(.*?\)\\*\/")/g;

                    text = text.replace(regEx, this.regExDate);

                    // *** End RAS Update



                    j = eval('(' + text + ')');



                    // In the optional third stage, we recursively walk the new structure, passing

                    // each name/value pair to a reviver function for possible transformation.



                    return typeof reviver === 'function' ?

                        walk({ '': j }, '') : j;

                }



                // If the text is not JSON parseable, then a  is thrown.

                throw new SyntaxError('JSON.parse');

            },

            // *** RAS Update: RegEx handler for dates ISO and MS AJAX style

            regExDate: function(str, p1, p2, offset, s) {

                str = str.substring(1).replace('"', '');

                var date = str;



                // MS Ajax date: /Date(19834141)/

                if (/\/Date(.*)\//.test(str)) {

                    str = str.match(/Date\((.*?)\)/)[1];

                    date = "new Date(" + parseInt(str) + ")";

                }

                else { // ISO Date 2007-12-31T23:59:59Z                                     

                    var matches = str.split(/[-,:,T,Z]/);

                    matches[1] = (parseInt(matches[1], 0) - 1).toString();

                    date = "new Date(Date.UTC(" + matches.join(",") + "))";

                }

                return date;

            },



            quote: quote

        };

    } ();
}