'use strict';
|
|
var forEach = require('for-each');
|
var availableTypedArrays = require('available-typed-arrays');
|
var callBind = require('call-bind');
|
var callBound = require('call-bound');
|
var gOPD = require('gopd');
|
var getProto = require('get-proto');
|
|
var $toString = callBound('Object.prototype.toString');
|
var hasToStringTag = require('has-tostringtag/shams')();
|
|
var g = typeof globalThis === 'undefined' ? global : globalThis;
|
var typedArrays = availableTypedArrays();
|
|
var $slice = callBound('String.prototype.slice');
|
|
/** @type {<T = unknown>(array: readonly T[], value: unknown) => number} */
|
var $indexOf = callBound('Array.prototype.indexOf', true) || function indexOf(array, value) {
|
for (var i = 0; i < array.length; i += 1) {
|
if (array[i] === value) {
|
return i;
|
}
|
}
|
return -1;
|
};
|
|
/** @typedef {import('./types').Getter} Getter */
|
/** @type {import('./types').Cache} */
|
var cache = { __proto__: null };
|
if (hasToStringTag && gOPD && getProto) {
|
forEach(typedArrays, function (typedArray) {
|
var arr = new g[typedArray]();
|
if (Symbol.toStringTag in arr && getProto) {
|
var proto = getProto(arr);
|
// @ts-expect-error TS won't narrow inside a closure
|
var descriptor = gOPD(proto, Symbol.toStringTag);
|
if (!descriptor && proto) {
|
var superProto = getProto(proto);
|
// @ts-expect-error TS won't narrow inside a closure
|
descriptor = gOPD(superProto, Symbol.toStringTag);
|
}
|
// @ts-expect-error TODO: fix
|
cache['$' + typedArray] = callBind(descriptor.get);
|
}
|
});
|
} else {
|
forEach(typedArrays, function (typedArray) {
|
var arr = new g[typedArray]();
|
var fn = arr.slice || arr.set;
|
if (fn) {
|
cache[
|
/** @type {`$${import('.').TypedArrayName}`} */ ('$' + typedArray)
|
] = /** @type {import('./types').BoundSlice | import('./types').BoundSet} */ (
|
// @ts-expect-error TODO FIXME
|
callBind(fn)
|
);
|
}
|
});
|
}
|
|
/** @type {(value: object) => false | import('.').TypedArrayName} */
|
var tryTypedArrays = function tryAllTypedArrays(value) {
|
/** @type {ReturnType<typeof tryAllTypedArrays>} */ var found = false;
|
forEach(
|
/** @type {Record<`\$${import('.').TypedArrayName}`, Getter>} */ (cache),
|
/** @type {(getter: Getter, name: `\$${import('.').TypedArrayName}`) => void} */
|
function (getter, typedArray) {
|
if (!found) {
|
try {
|
// @ts-expect-error a throw is fine here
|
if ('$' + getter(value) === typedArray) {
|
found = /** @type {import('.').TypedArrayName} */ ($slice(typedArray, 1));
|
}
|
} catch (e) { /**/ }
|
}
|
}
|
);
|
return found;
|
};
|
|
/** @type {(value: object) => false | import('.').TypedArrayName} */
|
var trySlices = function tryAllSlices(value) {
|
/** @type {ReturnType<typeof tryAllSlices>} */ var found = false;
|
forEach(
|
/** @type {Record<`\$${import('.').TypedArrayName}`, Getter>} */(cache),
|
/** @type {(getter: Getter, name: `\$${import('.').TypedArrayName}`) => void} */ function (getter, name) {
|
if (!found) {
|
try {
|
// @ts-expect-error a throw is fine here
|
getter(value);
|
found = /** @type {import('.').TypedArrayName} */ ($slice(name, 1));
|
} catch (e) { /**/ }
|
}
|
}
|
);
|
return found;
|
};
|
|
/** @type {import('.')} */
|
module.exports = function whichTypedArray(value) {
|
if (!value || typeof value !== 'object') { return false; }
|
if (!hasToStringTag) {
|
/** @type {string} */
|
var tag = $slice($toString(value), 8, -1);
|
if ($indexOf(typedArrays, tag) > -1) {
|
return tag;
|
}
|
if (tag !== 'Object') {
|
return false;
|
}
|
// node < 0.6 hits here on real Typed Arrays
|
return trySlices(value);
|
}
|
if (!gOPD) { return null; } // unknown engine
|
return tryTypedArrays(value);
|
};
|
