45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
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'use strict';
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/* !
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* Chai - getFuncName utility
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* Copyright(c) 2012-2016 Jake Luer <jake@alogicalparadox.com>
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* MIT Licensed
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*/
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/**
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* ### .getFuncName(constructorFn)
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*
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* Returns the name of a function.
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* When a non-function instance is passed, returns `null`.
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* This also includes a polyfill function if `aFunc.name` is not defined.
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*
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* @name getFuncName
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* @param {Function} funct
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* @namespace Utils
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* @api public
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*/
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var toString = Function.prototype.toString;
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var functionNameMatch = /\s*function(?:\s|\s*\/\*[^(?:*\/)]+\*\/\s*)*([^\s\(\/]+)/;
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function getFuncName(aFunc) {
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if (typeof aFunc !== 'function') {
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return null;
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}
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var name = '';
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if (typeof Function.prototype.name === 'undefined' && typeof aFunc.name === 'undefined') {
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// Here we run a polyfill if Function does not support the `name` property and if aFunc.name is not defined
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var match = toString.call(aFunc).match(functionNameMatch);
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if (match) {
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name = match[1];
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}
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} else {
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// If we've got a `name` property we just use it
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name = aFunc.name;
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}
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return name;
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}
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module.exports = getFuncName;
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