93 lines
2.3 KiB
Plaintext
93 lines
2.3 KiB
Plaintext
'use strict';
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var forEach = require('for-each');
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var availableTypedArrays = require('available-typed-arrays');
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var callBind = require('call-bind');
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var callBound = require('call-bind/callBound');
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var gOPD = require('gopd');
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var $toString = callBound('Object.prototype.toString');
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var hasToStringTag = require('has-tostringtag/shams')();
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var g = typeof globalThis === 'undefined' ? global : globalThis;
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var typedArrays = availableTypedArrays();
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var $slice = callBound('String.prototype.slice');
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var getPrototypeOf = Object.getPrototypeOf; // require('getprototypeof');
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var $indexOf = callBound('Array.prototype.indexOf', true) || function indexOf(array, value) {
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for (var i = 0; i < array.length; i += 1) {
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if (array[i] === value) {
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return i;
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}
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}
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return -1;
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};
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var cache = { __proto__: null };
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if (hasToStringTag && gOPD && getPrototypeOf) {
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forEach(typedArrays, function (typedArray) {
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var arr = new g[typedArray]();
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if (Symbol.toStringTag in arr) {
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var proto = getPrototypeOf(arr);
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var descriptor = gOPD(proto, Symbol.toStringTag);
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if (!descriptor) {
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var superProto = getPrototypeOf(proto);
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descriptor = gOPD(superProto, Symbol.toStringTag);
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}
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cache['$' + typedArray] = callBind(descriptor.get);
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}
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});
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} else {
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forEach(typedArrays, function (typedArray) {
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var arr = new g[typedArray]();
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var fn = arr.slice || arr.set;
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if (fn) {
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cache['$' + typedArray] = callBind(fn);
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}
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});
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}
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var tryTypedArrays = function tryAllTypedArrays(value) {
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var found = false;
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forEach(cache, function (getter, typedArray) {
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if (!found) {
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try {
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if ('$' + getter(value) === typedArray) {
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found = $slice(typedArray, 1);
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}
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} catch (e) { /**/ }
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}
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});
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return found;
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};
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var trySlices = function tryAllSlices(value) {
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var found = false;
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forEach(cache, function (getter, name) {
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if (!found) {
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try {
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getter(value);
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found = $slice(name, 1);
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} catch (e) { /**/ }
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}
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});
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return found;
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};
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module.exports = function whichTypedArray(value) {
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if (!value || typeof value !== 'object') { return false; }
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if (!hasToStringTag) {
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var tag = $slice($toString(value), 8, -1);
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if ($indexOf(typedArrays, tag) > -1) {
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return tag;
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}
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if (tag !== 'Object') {
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return false;
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}
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// node < 0.6 hits here on real Typed Arrays
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return trySlices(value);
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}
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if (!gOPD) { return null; } // unknown engine
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return tryTypedArrays(value);
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};
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