'use strict';
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var IsCallable = require('is-callable');
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var hasOwn = require('hasown');
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var functionsHaveNames = require('functions-have-names')();
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var callBound = require('call-bound');
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var $functionToString = callBound('Function.prototype.toString');
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var $stringMatch = callBound('String.prototype.match');
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var toStr = callBound('Object.prototype.toString');
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var classRegex = /^class /;
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var isClass = function isClassConstructor(fn) {
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if (IsCallable(fn)) {
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return false;
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}
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if (typeof fn !== 'function') {
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return false;
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}
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try {
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var match = $stringMatch($functionToString(fn), classRegex);
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return !!match;
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} catch (e) {}
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return false;
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};
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var regex = /\s*function\s+([^(\s]*)\s*/;
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var isIE68 = !(0 in [,]); // eslint-disable-line no-sparse-arrays, comma-spacing
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var objectClass = '[object Object]';
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var ddaClass = '[object HTMLAllCollection]';
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var functionProto = Function.prototype;
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var isDDA = function isDocumentDotAll() {
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return false;
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};
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if (typeof document === 'object') {
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// Firefox 3 canonicalizes DDA to undefined when it's not accessed directly
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var all = document.all;
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if (toStr(all) === toStr(document.all)) {
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isDDA = function isDocumentDotAll(value) {
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/* globals document: false */
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// in IE 6-8, typeof document.all is "object" and it's truthy
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if ((isIE68 || !value) && (typeof value === 'undefined' || typeof value === 'object')) {
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try {
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var str = toStr(value);
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// IE 6-8 uses `objectClass`
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return (str === ddaClass || str === objectClass) && value('') == null; // eslint-disable-line eqeqeq
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} catch (e) { /**/ }
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}
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return false;
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};
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}
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}
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module.exports = function getName() {
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if (isDDA(this) || (!isClass(this) && !IsCallable(this))) {
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throw new TypeError('Function.prototype.name sham getter called on non-function');
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}
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if (functionsHaveNames && hasOwn(this, 'name')) {
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return this.name;
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}
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if (this === functionProto) {
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return '';
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}
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var str = $functionToString(this);
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var match = $stringMatch(str, regex);
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var name = match && match[1];
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return name;
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};
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