var DataView = require('./_DataView'),
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Map = require('./_Map'),
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Promise = require('./_Promise'),
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Set = require('./_Set'),
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WeakMap = require('./_WeakMap'),
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baseGetTag = require('./_baseGetTag'),
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toSource = require('./_toSource');
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/** `Object#toString` result references. */
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var mapTag = '[object Map]',
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objectTag = '[object Object]',
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promiseTag = '[object Promise]',
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setTag = '[object Set]',
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weakMapTag = '[object WeakMap]';
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var dataViewTag = '[object DataView]';
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/** Used to detect maps, sets, and weakmaps. */
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var dataViewCtorString = toSource(DataView),
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mapCtorString = toSource(Map),
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promiseCtorString = toSource(Promise),
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setCtorString = toSource(Set),
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weakMapCtorString = toSource(WeakMap);
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/**
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* Gets the `toStringTag` of `value`.
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*
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* @private
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* @param {*} value The value to query.
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* @returns {string} Returns the `toStringTag`.
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*/
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var getTag = baseGetTag;
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// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
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if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
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(Map && getTag(new Map) != mapTag) ||
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(Promise && getTag(Promise.resolve()) != promiseTag) ||
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(Set && getTag(new Set) != setTag) ||
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(WeakMap && getTag(new WeakMap) != weakMapTag)) {
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getTag = function(value) {
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var result = baseGetTag(value),
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Ctor = result == objectTag ? value.constructor : undefined,
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ctorString = Ctor ? toSource(Ctor) : '';
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if (ctorString) {
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switch (ctorString) {
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case dataViewCtorString: return dataViewTag;
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case mapCtorString: return mapTag;
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case promiseCtorString: return promiseTag;
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case setCtorString: return setTag;
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case weakMapCtorString: return weakMapTag;
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}
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}
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return result;
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};
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}
|
|
module.exports = getTag;
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