/*
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;
                    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
        };
    } ();
}