102 lines
3.1 KiB
JavaScript
102 lines
3.1 KiB
JavaScript
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'use strict';
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var fnToStr = Function.prototype.toString;
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var reflectApply = typeof Reflect === 'object' && Reflect !== null && Reflect.apply;
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var badArrayLike;
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var isCallableMarker;
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if (typeof reflectApply === 'function' && typeof Object.defineProperty === 'function') {
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try {
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badArrayLike = Object.defineProperty({}, 'length', {
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get: function () {
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throw isCallableMarker;
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}
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});
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isCallableMarker = {};
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// eslint-disable-next-line no-throw-literal
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reflectApply(function () { throw 42; }, null, badArrayLike);
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} catch (_) {
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if (_ !== isCallableMarker) {
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reflectApply = null;
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}
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}
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} else {
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reflectApply = null;
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}
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var constructorRegex = /^\s*class\b/;
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var isES6ClassFn = function isES6ClassFunction(value) {
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try {
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var fnStr = fnToStr.call(value);
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return constructorRegex.test(fnStr);
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} catch (e) {
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return false; // not a function
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}
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};
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var tryFunctionObject = function tryFunctionToStr(value) {
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try {
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if (isES6ClassFn(value)) { return false; }
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fnToStr.call(value);
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return true;
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} catch (e) {
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return false;
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}
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};
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var toStr = Object.prototype.toString;
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var objectClass = '[object Object]';
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var fnClass = '[object Function]';
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var genClass = '[object GeneratorFunction]';
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var ddaClass = '[object HTMLAllCollection]'; // IE 11
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var ddaClass2 = '[object HTML document.all class]';
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var ddaClass3 = '[object HTMLCollection]'; // IE 9-10
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var hasToStringTag = typeof Symbol === 'function' && !!Symbol.toStringTag; // better: use `has-tostringtag`
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var isIE68 = !(0 in [,]); // eslint-disable-line no-sparse-arrays, comma-spacing
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var isDDA = function isDocumentDotAll() { return false; };
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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.call(all) === toStr.call(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.call(value);
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return (
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str === ddaClass
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|| str === ddaClass2
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|| str === ddaClass3 // opera 12.16
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|| str === objectClass // IE 6-8
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) && 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 = reflectApply
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? function isCallable(value) {
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if (isDDA(value)) { return true; }
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if (!value) { return false; }
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if (typeof value !== 'function' && typeof value !== 'object') { return false; }
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try {
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reflectApply(value, null, badArrayLike);
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} catch (e) {
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if (e !== isCallableMarker) { return false; }
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}
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return !isES6ClassFn(value) && tryFunctionObject(value);
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}
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: function isCallable(value) {
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if (isDDA(value)) { return true; }
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if (!value) { return false; }
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if (typeof value !== 'function' && typeof value !== 'object') { return false; }
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if (hasToStringTag) { return tryFunctionObject(value); }
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if (isES6ClassFn(value)) { return false; }
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var strClass = toStr.call(value);
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if (strClass !== fnClass && strClass !== genClass && !(/^\[object HTML/).test(strClass)) { return false; }
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return tryFunctionObject(value);
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};
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