1/**
 2 * JSON parse.
 3 *
 4 * @see Based on jQuery#parseJSON (MIT) and JSON2
 5 * @api private
 6 */
 7
 8var rvalidchars = /^[\],:{}\s]*$/;
 9var rvalidescape = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g;
10var rvalidtokens = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
11var rvalidbraces = /(?:^|:|,)(?:\s*\[)+/g;
12var rtrimLeft = /^\s+/;
13var rtrimRight = /\s+$/;
14
15module.exports = function parsejson(data) {
16  if ('string' != typeof data || !data) {
17    return null;
18  }
19
20  data = data.replace(rtrimLeft, '').replace(rtrimRight, '');
21
22  // Attempt to parse using the native JSON parser first
23  if (global.JSON && JSON.parse) {
24    return JSON.parse(data);
25  }
26
27  if (rvalidchars.test(data.replace(rvalidescape, '@')
28      .replace(rvalidtokens, ']')
29      .replace(rvalidbraces, ''))) {
30    return (new Function('return ' + data))();
31  }
32};