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Parse a JavaScript string function definition and return a function object. Does not use eval.
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/* Parse a string function definition and return a function object. Does not use eval. | |
* @param {string} str | |
* @return {function} | |
* | |
* Example: | |
* var f = function (x, y) { return x * y; }; | |
* var g = parseFunction(f.toString()); | |
* g(33, 3); //=> 99 | |
*/ | |
function parseFunction (str) { | |
var fn_body_idx = str.indexOf('{'), | |
fn_body = str.substring(fn_body_idx+1, str.lastIndexOf('}')), | |
fn_declare = str.substring(0, fn_body_idx), | |
fn_params = fn_declare.substring(fn_declare.indexOf('(')+1, fn_declare.lastIndexOf(')')), | |
args = fn_params.split(','); | |
args.push(fn_body); | |
function Fn () { | |
return Function.apply(this, args); | |
} | |
Fn.prototype = Function.prototype; | |
return new Fn(); | |
} |
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