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'use strict';
/* !
* Chai - getFuncName utility
* Copyright(c) 2012-2016 Jake Luer <[email protected]>
* MIT Licensed
*/
/**
* ### .getFuncName(constructorFn)
*
* Returns the name of a function.
* When a non-function instance is passed, returns `null`.
* This also includes a polyfill function if `aFunc.name` is not defined.
*
* @name getFuncName
* @param {Function} funct
* @namespace Utils
* @api public
*/
var toString = Function.prototype.toString;
var functionNameMatch = /\s*function(?:\s|\s*\/\*[^(?:*\/)]+\*\/\s*)*([^\s\(\/]+)/;
var maxFunctionSourceLength = 512;
function getFuncName(aFunc) {
if (typeof aFunc !== 'function') {
return null;
}
var name = '';
if (typeof Function.prototype.name === 'undefined' && typeof aFunc.name === 'undefined') {
// eslint-disable-next-line prefer-reflect
var functionSource = toString.call(aFunc);
// To avoid unconstrained resource consumption due to pathalogically large function names,
// we limit the available return value to be less than 512 characters.
if (functionSource.indexOf('(') > maxFunctionSourceLength) {
return name;
}
// Here we run a polyfill if Function does not support the `name` property and if aFunc.name is not defined
var match = functionSource.match(functionNameMatch);
if (match) {
name = match[1];
}
} else {
// If we've got a `name` property we just use it
name = aFunc.name;
}
return name;
}
module.exports = getFuncName;
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