rlm@90: 
rlm@90: /*
rlm@90:     http://www.JSON.org/json2.js
rlm@90:     2010-03-20
rlm@90: 
rlm@90:     Public Domain.
rlm@90: 
rlm@90:     NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
rlm@90: 
rlm@90:     See http://www.JSON.org/js.html
rlm@90: 
rlm@90: 
rlm@90:     This code should be minified before deployment.
rlm@90:     See http://javascript.crockford.com/jsmin.html
rlm@90: 
rlm@90:     USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
rlm@90:     NOT CONTROL.
rlm@90: 
rlm@90: 
rlm@90:     This file creates a global JSON object containing two methods: stringify
rlm@90:     and parse.
rlm@90: 
rlm@90:         JSON.stringify(value, replacer, space)
rlm@90:             value       any JavaScript value, usually an object or array.
rlm@90: 
rlm@90:             replacer    an optional parameter that determines how object
rlm@90:                         values are stringified for objects. It can be a
rlm@90:                         function or an array of strings.
rlm@90: 
rlm@90:             space       an optional parameter that specifies the indentation
rlm@90:                         of nested structures. If it is omitted, the text will
rlm@90:                         be packed without extra whitespace. If it is a number,
rlm@90:                         it will specify the number of spaces to indent at each
rlm@90:                         level. If it is a string (such as '\t' or ' '),
rlm@90:                         it contains the characters used to indent at each level.
rlm@90: 
rlm@90:             This method produces a JSON text from a JavaScript value.
rlm@90: 
rlm@90:             When an object value is found, if the object contains a toJSON
rlm@90:             method, its toJSON method will be called and the result will be
rlm@90:             stringified. A toJSON method does not serialize: it returns the
rlm@90:             value represented by the name/value pair that should be serialized,
rlm@90:             or undefined if nothing should be serialized. The toJSON method
rlm@90:             will be passed the key associated with the value, and this will be
rlm@90:             bound to the value
rlm@90: 
rlm@90:             For example, this would serialize Dates as ISO strings.
rlm@90: 
rlm@90:                 Date.prototype.toJSON = function (key) {
rlm@90:                     function f(n) {
rlm@90:                         // Format integers to have at least two digits.
rlm@90:                         return n < 10 ? '0' + n : n;
rlm@90:                     }
rlm@90: 
rlm@90:                     return this.getUTCFullYear()   + '-' +
rlm@90:                          f(this.getUTCMonth() + 1) + '-' +
rlm@90:                          f(this.getUTCDate())      + 'T' +
rlm@90:                          f(this.getUTCHours())     + ':' +
rlm@90:                          f(this.getUTCMinutes())   + ':' +
rlm@90:                          f(this.getUTCSeconds())   + 'Z';
rlm@90:                 };
rlm@90: 
rlm@90:             You can provide an optional replacer method. It will be passed the
rlm@90:             key and value of each member, with this bound to the containing
rlm@90:             object. The value that is returned from your method will be
rlm@90:             serialized. If your method returns undefined, then the member will
rlm@90:             be excluded from the serialization.
rlm@90: 
rlm@90:             If the replacer parameter is an array of strings, then it will be
rlm@90:             used to select the members to be serialized. It filters the results
rlm@90:             such that only members with keys listed in the replacer array are
rlm@90:             stringified.
rlm@90: 
rlm@90:             Values that do not have JSON representations, such as undefined or
rlm@90:             functions, will not be serialized. Such values in objects will be
rlm@90:             dropped; in arrays they will be replaced with null. You can use
rlm@90:             a replacer function to replace those with JSON values.
rlm@90:             JSON.stringify(undefined) returns undefined.
rlm@90: 
rlm@90:             The optional space parameter produces a stringification of the
rlm@90:             value that is filled with line breaks and indentation to make it
rlm@90:             easier to read.
rlm@90: 
rlm@90:             If the space parameter is a non-empty string, then that string will
rlm@90:             be used for indentation. If the space parameter is a number, then
rlm@90:             the indentation will be that many spaces.
rlm@90: 
rlm@90:             Example:
rlm@90: 
rlm@90:             text = JSON.stringify(['e', {pluribus: 'unum'}]);
rlm@90:             // text is '["e",{"pluribus":"unum"}]'
rlm@90: 
rlm@90: 
rlm@90:             text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
rlm@90:             // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
rlm@90: 
rlm@90:             text = JSON.stringify([new Date()], function (key, value) {
rlm@90:                 return this[key] instanceof Date ?
rlm@90:                     'Date(' + this[key] + ')' : value;
rlm@90:             });
rlm@90:             // text is '["Date(---current time---)"]'
rlm@90: 
rlm@90: 
rlm@90:         JSON.parse(text, reviver)
rlm@90:             This method parses a JSON text to produce an object or array.
rlm@90:             It can throw a SyntaxError exception.
rlm@90: 
rlm@90:             The optional reviver parameter is a function that can filter and
rlm@90:             transform the results. It receives each of the keys and values,
rlm@90:             and its return value is used instead of the original value.
rlm@90:             If it returns what it received, then the structure is not modified.
rlm@90:             If it returns undefined then the member is deleted.
rlm@90: 
rlm@90:             Example:
rlm@90: 
rlm@90:             // Parse the text. Values that look like ISO date strings will
rlm@90:             // be converted to Date objects.
rlm@90: 
rlm@90:             myData = JSON.parse(text, function (key, value) {
rlm@90:                 var a;
rlm@90:                 if (typeof value === 'string') {
rlm@90:                     a =
rlm@90: /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
rlm@90:                     if (a) {
rlm@90:                         return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
rlm@90:                             +a[5], +a[6]));
rlm@90:                     }
rlm@90:                 }
rlm@90:                 return value;
rlm@90:             });
rlm@90: 
rlm@90:             myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
rlm@90:                 var d;
rlm@90:                 if (typeof value === 'string' &&
rlm@90:                         value.slice(0, 5) === 'Date(' &&
rlm@90:                         value.slice(-1) === ')') {
rlm@90:                     d = new Date(value.slice(5, -1));
rlm@90:                     if (d) {
rlm@90:                         return d;
rlm@90:                     }
rlm@90:                 }
rlm@90:                 return value;
rlm@90:             });
rlm@90: 
rlm@90: 
rlm@90:     This is a reference implementation. You are free to copy, modify, or
rlm@90:     redistribute.
rlm@90: */
rlm@90: 
rlm@90: /*jslint evil: true, strict: false */
rlm@90: 
rlm@90: /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
rlm@90:     call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
rlm@90:     getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
rlm@90:     lastIndex, length, parse, prototype, push, replace, slice, stringify,
rlm@90:     test, toJSON, toString, valueOf
rlm@90: */
rlm@90: 
rlm@90: 
rlm@90: // Create a JSON object only if one does not already exist. We create the
rlm@90: // methods in a closure to avoid creating global variables.
rlm@90: 
rlm@90: if (!this.JSON) {
rlm@90:     this.JSON = {};
rlm@90: }
rlm@90: 
rlm@90: (function () {
rlm@90: 
rlm@90:     function f(n) {
rlm@90:         // Format integers to have at least two digits.
rlm@90:         return n < 10 ? '0' + n : n;
rlm@90:     }
rlm@90: 
rlm@90:     if (typeof Date.prototype.toJSON !== 'function') {
rlm@90: 
rlm@90:         Date.prototype.toJSON = function (key) {
rlm@90: 
rlm@90:             return isFinite(this.valueOf()) ?
rlm@90:                    this.getUTCFullYear()   + '-' +
rlm@90:                  f(this.getUTCMonth() + 1) + '-' +
rlm@90:                  f(this.getUTCDate())      + 'T' +
rlm@90:                  f(this.getUTCHours())     + ':' +
rlm@90:                  f(this.getUTCMinutes())   + ':' +
rlm@90:                  f(this.getUTCSeconds())   + 'Z' : null;
rlm@90:         };
rlm@90: 
rlm@90:         String.prototype.toJSON =
rlm@90:         Number.prototype.toJSON =
rlm@90:         Boolean.prototype.toJSON = function (key) {
rlm@90:             return this.valueOf();
rlm@90:         };
rlm@90:     }
rlm@90: 
rlm@90:     var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
rlm@90:         escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
rlm@90:         gap,
rlm@90:         indent,
rlm@90:         meta = {    // table of character substitutions
rlm@90:             '\b': '\\b',
rlm@90:             '\t': '\\t',
rlm@90:             '\n': '\\n',
rlm@90:             '\f': '\\f',
rlm@90:             '\r': '\\r',
rlm@90:             '"' : '\\"',
rlm@90:             '\\': '\\\\'
rlm@90:         },
rlm@90:         rep;
rlm@90: 
rlm@90: 
rlm@90:     function quote(string) {
rlm@90: 
rlm@90: // If the string contains no control characters, no quote characters, and no
rlm@90: // backslash characters, then we can safely slap some quotes around it.
rlm@90: // Otherwise we must also replace the offending characters with safe escape
rlm@90: // sequences.
rlm@90: 
rlm@90:         escapable.lastIndex = 0;
rlm@90:         return escapable.test(string) ?
rlm@90:             '"' + string.replace(escapable, function (a) {
rlm@90:                 var c = meta[a];
rlm@90:                 return typeof c === 'string' ? c :
rlm@90:                     '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
rlm@90:             }) + '"' :
rlm@90:             '"' + string + '"';
rlm@90:     }
rlm@90: 
rlm@90: 
rlm@90:     function str(key, holder) {
rlm@90: 
rlm@90: // Produce a string from holder[key].
rlm@90: 
rlm@90:         var i,          // The loop counter.
rlm@90:             k,          // The member key.
rlm@90:             v,          // The member value.
rlm@90:             length,
rlm@90:             mind = gap,
rlm@90:             partial,
rlm@90:             value = holder[key];
rlm@90: 
rlm@90: // If the value has a toJSON method, call it to obtain a replacement value.
rlm@90: 
rlm@90:         if (value && typeof value === 'object' &&
rlm@90:                 typeof value.toJSON === 'function') {
rlm@90:             value = value.toJSON(key);
rlm@90:         }
rlm@90: 
rlm@90: // If we were called with a replacer function, then call the replacer to
rlm@90: // obtain a replacement value.
rlm@90: 
rlm@90:         if (typeof rep === 'function') {
rlm@90:             value = rep.call(holder, key, value);
rlm@90:         }
rlm@90: 
rlm@90: // What happens next depends on the value's type.
rlm@90: 
rlm@90:         switch (typeof value) {
rlm@90:         case 'string':
rlm@90:             return quote(value);
rlm@90: 
rlm@90:         case 'number':
rlm@90: 
rlm@90: // JSON numbers must be finite. Encode non-finite numbers as null.
rlm@90: 
rlm@90:             return isFinite(value) ? String(value) : 'null';
rlm@90: 
rlm@90:         case 'boolean':
rlm@90:         case 'null':
rlm@90: 
rlm@90: // If the value is a boolean or null, convert it to a string. Note:
rlm@90: // typeof null does not produce 'null'. The case is included here in
rlm@90: // the remote chance that this gets fixed someday.
rlm@90: 
rlm@90:             return String(value);
rlm@90: 
rlm@90: // If the type is 'object', we might be dealing with an object or an array or
rlm@90: // null.
rlm@90: 
rlm@90:         case 'object':
rlm@90: 
rlm@90: // Due to a specification blunder in ECMAScript, typeof null is 'object',
rlm@90: // so watch out for that case.
rlm@90: 
rlm@90:             if (!value) {
rlm@90:                 return 'null';
rlm@90:             }
rlm@90: 
rlm@90: // Make an array to hold the partial results of stringifying this object value.
rlm@90: 
rlm@90:             gap += indent;
rlm@90:             partial = [];
rlm@90: 
rlm@90: // Is the value an array?
rlm@90: 
rlm@90:             if (Object.prototype.toString.apply(value) === '[object Array]') {
rlm@90: 
rlm@90: // The value is an array. Stringify every element. Use null as a placeholder
rlm@90: // for non-JSON values.
rlm@90: 
rlm@90:                 length = value.length;
rlm@90:                 for (i = 0; i < length; i += 1) {
rlm@90:                     partial[i] = str(i, value) || 'null';
rlm@90:                 }
rlm@90: 
rlm@90: // Join all of the elements together, separated with commas, and wrap them in
rlm@90: // brackets.
rlm@90: 
rlm@90:                 v = partial.length === 0 ? '[]' :
rlm@90:                     gap ? '[\n' + gap +
rlm@90:                             partial.join(',\n' + gap) + '\n' +
rlm@90:                                 mind + ']' :
rlm@90:                           '[' + partial.join(',') + ']';
rlm@90:                 gap = mind;
rlm@90:                 return v;
rlm@90:             }
rlm@90: 
rlm@90: // If the replacer is an array, use it to select the members to be stringified.
rlm@90: 
rlm@90:             if (rep && typeof rep === 'object') {
rlm@90:                 length = rep.length;
rlm@90:                 for (i = 0; i < length; i += 1) {
rlm@90:                     k = rep[i];
rlm@90:                     if (typeof k === 'string') {
rlm@90:                         v = str(k, value);
rlm@90:                         if (v) {
rlm@90:                             partial.push(quote(k) + (gap ? ': ' : ':') + v);
rlm@90:                         }
rlm@90:                     }
rlm@90:                 }
rlm@90:             } else {
rlm@90: 
rlm@90: // Otherwise, iterate through all of the keys in the object.
rlm@90: 
rlm@90:                 for (k in value) {
rlm@90:                     if (Object.hasOwnProperty.call(value, k)) {
rlm@90:                         v = str(k, value);
rlm@90:                         if (v) {
rlm@90:                             partial.push(quote(k) + (gap ? ': ' : ':') + v);
rlm@90:                         }
rlm@90:                     }
rlm@90:                 }
rlm@90:             }
rlm@90: 
rlm@90: // Join all of the member texts together, separated with commas,
rlm@90: // and wrap them in braces.
rlm@90: 
rlm@90:             v = partial.length === 0 ? '{}' :
rlm@90:                 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
rlm@90:                         mind + '}' : '{' + partial.join(',') + '}';
rlm@90:             gap = mind;
rlm@90:             return v;
rlm@90:         }
rlm@90:     }
rlm@90: 
rlm@90: // If the JSON object does not yet have a stringify method, give it one.
rlm@90: 
rlm@90:     if (typeof JSON.stringify !== 'function') {
rlm@90:         JSON.stringify = function (value, replacer, space) {
rlm@90: 
rlm@90: // The stringify method takes a value and an optional replacer, and an optional
rlm@90: // space parameter, and returns a JSON text. The replacer can be a function
rlm@90: // that can replace values, or an array of strings that will select the keys.
rlm@90: // A default replacer method can be provided. Use of the space parameter can
rlm@90: // produce text that is more easily readable.
rlm@90: 
rlm@90:             var i;
rlm@90:             gap = '';
rlm@90:             indent = '';
rlm@90: 
rlm@90: // If the space parameter is a number, make an indent string containing that
rlm@90: // many spaces.
rlm@90: 
rlm@90:             if (typeof space === 'number') {
rlm@90:                 for (i = 0; i < space; i += 1) {
rlm@90:                     indent += ' ';
rlm@90:                 }
rlm@90: 
rlm@90: // If the space parameter is a string, it will be used as the indent string.
rlm@90: 
rlm@90:             } else if (typeof space === 'string') {
rlm@90:                 indent = space;
rlm@90:             }
rlm@90: 
rlm@90: // If there is a replacer, it must be a function or an array.
rlm@90: // Otherwise, throw an error.
rlm@90: 
rlm@90:             rep = replacer;
rlm@90:             if (replacer && typeof replacer !== 'function' &&
rlm@90:                     (typeof replacer !== 'object' ||
rlm@90:                      typeof replacer.length !== 'number')) {
rlm@90:                 throw new Error('JSON.stringify');
rlm@90:             }
rlm@90: 
rlm@90: // Make a fake root object containing our value under the key of ''.
rlm@90: // Return the result of stringifying the value.
rlm@90: 
rlm@90:             return str('', {'': value});
rlm@90:         };
rlm@90:     }
rlm@90: 
rlm@90: 
rlm@90: // If the JSON object does not yet have a parse method, give it one.
rlm@90: 
rlm@90:     if (typeof JSON.parse !== 'function') {
rlm@90:         JSON.parse = function (text, reviver) {
rlm@90: 
rlm@90: // The parse method takes a text and an optional reviver function, and returns
rlm@90: // a JavaScript value if the text is a valid JSON text.
rlm@90: 
rlm@90:             var j;
rlm@90: 
rlm@90:             function walk(holder, key) {
rlm@90: 
rlm@90: // The walk method is used to recursively walk the resulting structure so
rlm@90: // that modifications can be made.
rlm@90: 
rlm@90:                 var k, v, value = holder[key];
rlm@90:                 if (value && typeof value === 'object') {
rlm@90:                     for (k in value) {
rlm@90:                         if (Object.hasOwnProperty.call(value, k)) {
rlm@90:                             v = walk(value, k);
rlm@90:                             if (v !== undefined) {
rlm@90:                                 value[k] = v;
rlm@90:                             } else {
rlm@90:                                 delete value[k];
rlm@90:                             }
rlm@90:                         }
rlm@90:                     }
rlm@90:                 }
rlm@90:                 return reviver.call(holder, key, value);
rlm@90:             }
rlm@90: 
rlm@90: 
rlm@90: // Parsing happens in four stages. In the first stage, we replace certain
rlm@90: // Unicode characters with escape sequences. JavaScript handles many characters
rlm@90: // incorrectly, either silently deleting them, or treating them as line endings.
rlm@90: 
rlm@90:             text = String(text);
rlm@90:             cx.lastIndex = 0;
rlm@90:             if (cx.test(text)) {
rlm@90:                 text = text.replace(cx, function (a) {
rlm@90:                     return '\\u' +
rlm@90:                         ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
rlm@90:                 });
rlm@90:             }
rlm@90: 
rlm@90: // In the second stage, we run the text against regular expressions that look
rlm@90: // for non-JSON patterns. We are especially concerned with '()' and 'new'
rlm@90: // because they can cause invocation, and '=' because it can cause mutation.
rlm@90: // But just to be safe, we want to reject all unexpected forms.
rlm@90: 
rlm@90: // We split the second stage into 4 regexp operations in order to work around
rlm@90: // crippling inefficiencies in IE's and Safari's regexp engines. First we
rlm@90: // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
rlm@90: // replace all simple value tokens with ']' characters. Third, we delete all
rlm@90: // open brackets that follow a colon or comma or that begin the text. Finally,
rlm@90: // we look to see that the remaining characters are only whitespace or ']' or
rlm@90: // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
rlm@90: 
rlm@90:             if (/^[\],:{}\s]*$/.
rlm@90: test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
rlm@90: replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
rlm@90: replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
rlm@90: 
rlm@90: // In the third stage we use the eval function to compile the text into a
rlm@90: // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
rlm@90: // in JavaScript: it can begin a block or an object literal. We wrap the text
rlm@90: // in parens to eliminate the ambiguity.
rlm@90: 
rlm@90:                 j = eval('(' + text + ')');
rlm@90: 
rlm@90: // In the optional fourth stage, we recursively walk the new structure, passing
rlm@90: // each name/value pair to a reviver function for possible transformation.
rlm@90: 
rlm@90:                 return typeof reviver === 'function' ?
rlm@90:                     walk({'': j}, '') : j;
rlm@90:             }
rlm@90: 
rlm@90: // If the text is not JSON parseable, then a SyntaxError is thrown.
rlm@90: 
rlm@90:             throw new SyntaxError('JSON.parse');
rlm@90:         };
rlm@90:     }
rlm@90: }());