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