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/*
* Copyright 2010, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
(function () {
/**
JSOL stands for JavaScript Object Literal which is a string representing
an object in JavaScript syntax.
For example:
{foo:"bar"} is equivalent to {"foo":"bar"} in JavaScript. Both are valid JSOL.
Note that {"foo":"bar"} is proper JSON[1] therefore you can use one of the many
JSON parsers out there like json2.js[2] or even the native browser's JSON parser,
if available.
However, {foo:"bar"} is NOT proper JSON but valid Javascript syntax for
representing an object with one key, "foo" and its value, "bar".
Using a JSON parser is not an option since this is NOT proper JSON.
You can use JSOL.parse to safely parse any string that reprsents a JavaScript Object Literal.
JSOL.parse will throw an Invalid JSOL exception on function calls, function declarations and variable references.
Examples:
JSOL.parse('{foo:"bar"}'); // valid
JSOL.parse('{evil:(function(){alert("I\'m evil");})()}'); // invalid function calls
JSOL.parse('{fn:function() { }}'); // invalid function declarations
var bar = "bar";
JSOL.parse('{foo:bar}'); // invalid variable references
[1] http://www.json.org
[2] http://www.json.org/json2.js
*/
var trim = /^(\s|\u00A0)+|(\s|\u00A0)+$/g; // Used for trimming whitespace
var JSOL = {
parse: function(text) {
// make sure text is a "string"
if (typeof text !== "string" || !text) {
return null;
}
// Make sure leading/trailing whitespace is removed
text = text.replace(trim, "");
// Make sure the incoming text is actual JSOL (or Javascript Object Literal)
// Logic borrowed from http://json.org/json2.js
if ( /^[\],:{}\s]*$/.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, "@")
.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, "]")
.replace(/(?:^|:|,)(?:\s*\[)+/g, ":")
/** everything up to this point is json2.js **/
/** this is the 5th stage where it accepts unquoted keys **/
.replace(/\w*\s*\:/g, ":")) ) {
return (new Function("return " + text))();
}
else {
throw("Invalid JSOL: " + text);
}
}
};
if (typeof define === "function" && define.amd) {
define(JSOL);
} else if (typeof module === "object" && module.exports) {
module.exports = JSOL;
} else {
this.JSOL = JSOL;
}
})();
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