1 | var DataView = require('./_DataView'),
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2 | Map = require('./_Map'),
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3 | Promise = require('./_Promise'),
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4 | Set = require('./_Set'),
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5 | WeakMap = require('./_WeakMap'),
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6 | baseGetTag = require('./_baseGetTag'),
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7 | toSource = require('./_toSource');
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8 |
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9 | /** `Object#toString` result references. */
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10 | var mapTag = '[object Map]',
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11 | objectTag = '[object Object]',
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12 | promiseTag = '[object Promise]',
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13 | setTag = '[object Set]',
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14 | weakMapTag = '[object WeakMap]';
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15 |
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16 | var dataViewTag = '[object DataView]';
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17 |
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18 | /** Used to detect maps, sets, and weakmaps. */
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19 | var dataViewCtorString = toSource(DataView),
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20 | mapCtorString = toSource(Map),
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21 | promiseCtorString = toSource(Promise),
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22 | setCtorString = toSource(Set),
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23 | weakMapCtorString = toSource(WeakMap);
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24 |
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25 | /**
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26 | * Gets the `toStringTag` of `value`.
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27 | *
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28 | * @private
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29 | * @param {*} value The value to query.
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30 | * @returns {string} Returns the `toStringTag`.
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31 | */
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32 | var getTag = baseGetTag;
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33 |
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34 | // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
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35 | if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
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36 | (Map && getTag(new Map) != mapTag) ||
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37 | (Promise && getTag(Promise.resolve()) != promiseTag) ||
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38 | (Set && getTag(new Set) != setTag) ||
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39 | (WeakMap && getTag(new WeakMap) != weakMapTag)) {
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40 | getTag = function(value) {
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41 | var result = baseGetTag(value),
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42 | Ctor = result == objectTag ? value.constructor : undefined,
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43 | ctorString = Ctor ? toSource(Ctor) : '';
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44 |
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45 | if (ctorString) {
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46 | switch (ctorString) {
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47 | case dataViewCtorString: return dataViewTag;
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48 | case mapCtorString: return mapTag;
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49 | case promiseCtorString: return promiseTag;
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50 | case setCtorString: return setTag;
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51 | case weakMapCtorString: return weakMapTag;
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52 | }
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53 | }
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54 | return result;
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55 | };
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56 | }
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57 |
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58 | module.exports = getTag;
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