ut2/lib/internals/getTagWithBugfix.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var native = require('./native.js');
var helpers = require('./helpers.js');
var getTag = require('./getTag.js');

var dataViewExisted = typeof DataView !== native.stringUndefined;
var mapExisted = typeof Map !== native.stringUndefined;
var promiseExisted = typeof Promise !== native.stringUndefined;
var setExisted = typeof Set !== native.stringUndefined;
var weakMapExisted = typeof WeakMap !== native.stringUndefined;
var dataViewCtorString = helpers.toSource(DataView);
var mapCtorString = helpers.toSource(Map);
var promiseCtorString = helpers.toSource(Promise);
var setCtorString = helpers.toSource(Set);
var weakMapCtorString = helpers.toSource(WeakMap);
var getTagWithBugfix$1 = getTag;
if ((dataViewExisted && getTag(new DataView(new ArrayBuffer(1))) !== native.dataViewTag) ||
    (mapExisted && getTag(new Map()) !== native.mapTag) ||
    (promiseExisted && getTag(Promise.resolve()) !== native.promiseTag) ||
    (setExisted && getTag(new Set()) !== native.setTag) ||
    (weakMapExisted && getTag(new WeakMap()) !== native.weakMapTag)) {
    getTagWithBugfix$1 = function (value) {
        var result = getTag(value);
        var Ctor = result === native.objectTag ? value.constructor : native.nativeUndefined;
        var ctorString = Ctor ? helpers.toSource(Ctor) : '';
        if (ctorString) {
            switch (ctorString) {
                case dataViewCtorString:
                    return native.dataViewTag;
                case mapCtorString:
                    return native.mapTag;
                case promiseCtorString:
                    return native.promiseTag;
                case setCtorString:
                    return native.setTag;
                case weakMapCtorString:
                    return native.weakMapTag;
            }
        }
        return result;
    };
}
var getTagWithBugfix = getTagWithBugfix$1;

module.exports = getTagWithBugfix;