GetIntrinsic.js

'use strict';

/* globals
	Atomics,
	SharedArrayBuffer,
*/

var undefined;

var $TypeError = TypeError;

var $gOPD = Object.getOwnPropertyDescriptor;
if ($gOPD) {
	try {
		$gOPD({}, '');
	} catch (e) {
		$gOPD = null; // this is IE 8, which has a broken gOPD
	}
}

var throwTypeError = function () { throw new $TypeError(); };
var ThrowTypeError = $gOPD
	? (function () {
		try {
			// eslint-disable-next-line no-unused-expressions, no-caller, no-restricted-properties
			arguments.callee; // IE 8 does not throw here
			return throwTypeError;
		} catch (calleeThrows) {
			try {
				// IE 8 throws on Object.getOwnPropertyDescriptor(arguments, '')
				return $gOPD(arguments, 'callee').get;
			} catch (gOPDthrows) {
				return throwTypeError;
			}
		}
	}())
	: throwTypeError;

var hasSymbols = require('has-symbols')();

var getProto = Object.getPrototypeOf || function (x) { return x.__proto__; }; // eslint-disable-line no-proto

var generator; // = function * () {};
var generatorFunction = generator ? getProto(generator) : undefined;
var asyncFn; // async function() {};
var asyncFunction = asyncFn ? asyncFn.constructor : undefined;
var asyncGen; // async function * () {};
var asyncGenFunction = asyncGen ? getProto(asyncGen) : undefined;
var asyncGenIterator = asyncGen ? asyncGen() : undefined;

var TypedArray = typeof Uint8Array === 'undefined' ? undefined : getProto(Uint8Array);

var INTRINSICS = {
	'%Array%': Array,
	'%ArrayBuffer%': typeof ArrayBuffer === 'undefined' ? undefined : ArrayBuffer,
	'%ArrayBufferPrototype%': typeof ArrayBuffer === 'undefined' ? undefined : ArrayBuffer.prototype,
	'%ArrayIteratorPrototype%': hasSymbols ? getProto([][Symbol.iterator]()) : undefined,
	'%ArrayPrototype%': Array.prototype,
	'%ArrayProto_entries%': Array.prototype.entries,
	'%ArrayProto_forEach%': Array.prototype.forEach,
	'%ArrayProto_keys%': Array.prototype.keys,
	'%ArrayProto_values%': Array.prototype.values,
	'%AsyncFromSyncIteratorPrototype%': undefined,
	'%AsyncFunction%': asyncFunction,
	'%AsyncFunctionPrototype%': asyncFunction ? asyncFunction.prototype : undefined,
	'%AsyncGenerator%': asyncGen ? getProto(asyncGenIterator) : undefined,
	'%AsyncGeneratorFunction%': asyncGenFunction,
	'%AsyncGeneratorPrototype%': asyncGenFunction ? asyncGenFunction.prototype : undefined,
	'%AsyncIteratorPrototype%': asyncGenIterator && hasSymbols && Symbol.asyncIterator ? asyncGenIterator[Symbol.asyncIterator]() : undefined,
	'%Atomics%': typeof Atomics === 'undefined' ? undefined : Atomics,
	'%Boolean%': Boolean,
	'%BooleanPrototype%': Boolean.prototype,
	'%DataView%': typeof DataView === 'undefined' ? undefined : DataView,
	'%DataViewPrototype%': typeof DataView === 'undefined' ? undefined : DataView.prototype,
	'%Date%': Date,
	'%DatePrototype%': Date.prototype,
	'%decodeURI%': decodeURI,
	'%decodeURIComponent%': decodeURIComponent,
	'%encodeURI%': encodeURI,
	'%encodeURIComponent%': encodeURIComponent,
	'%Error%': Error,
	'%ErrorPrototype%': Error.prototype,
	'%eval%': eval, // eslint-disable-line no-eval
	'%EvalError%': EvalError,
	'%EvalErrorPrototype%': EvalError.prototype,
	'%Float32Array%': typeof Float32Array === 'undefined' ? undefined : Float32Array,
	'%Float32ArrayPrototype%': typeof Float32Array === 'undefined' ? undefined : Float32Array.prototype,
	'%Float64Array%': typeof Float64Array === 'undefined' ? undefined : Float64Array,
	'%Float64ArrayPrototype%': typeof Float64Array === 'undefined' ? undefined : Float64Array.prototype,
	'%Function%': Function,
	'%FunctionPrototype%': Function.prototype,
	'%Generator%': generator ? getProto(generator()) : undefined,
	'%GeneratorFunction%': generatorFunction,
	'%GeneratorPrototype%': generatorFunction ? generatorFunction.prototype : undefined,
	'%Int8Array%': typeof Int8Array === 'undefined' ? undefined : Int8Array,
	'%Int8ArrayPrototype%': typeof Int8Array === 'undefined' ? undefined : Int8Array.prototype,
	'%Int16Array%': typeof Int16Array === 'undefined' ? undefined : Int16Array,
	'%Int16ArrayPrototype%': typeof Int16Array === 'undefined' ? undefined : Int8Array.prototype,
	'%Int32Array%': typeof Int32Array === 'undefined' ? undefined : Int32Array,
	'%Int32ArrayPrototype%': typeof Int32Array === 'undefined' ? undefined : Int32Array.prototype,
	'%isFinite%': isFinite,
	'%isNaN%': isNaN,
	'%IteratorPrototype%': hasSymbols ? getProto(getProto([][Symbol.iterator]())) : undefined,
	'%JSON%': typeof JSON === 'object' ? JSON : undefined,
	'%JSONParse%': typeof JSON === 'object' ? JSON.parse : undefined,
	'%Map%': typeof Map === 'undefined' ? undefined : Map,
	'%MapIteratorPrototype%': typeof Map === 'undefined' || !hasSymbols ? undefined : getProto(new Map()[Symbol.iterator]()),
	'%MapPrototype%': typeof Map === 'undefined' ? undefined : Map.prototype,
	'%Math%': Math,
	'%Number%': Number,
	'%NumberPrototype%': Number.prototype,
	'%Object%': Object,
	'%ObjectPrototype%': Object.prototype,
	'%ObjProto_toString%': Object.prototype.toString,
	'%ObjProto_valueOf%': Object.prototype.valueOf,
	'%parseFloat%': parseFloat,
	'%parseInt%': parseInt,
	'%Promise%': typeof Promise === 'undefined' ? undefined : Promise,
	'%PromisePrototype%': typeof Promise === 'undefined' ? undefined : Promise.prototype,
	'%PromiseProto_then%': typeof Promise === 'undefined' ? undefined : Promise.prototype.then,
	'%Promise_all%': typeof Promise === 'undefined' ? undefined : Promise.all,
	'%Promise_reject%': typeof Promise === 'undefined' ? undefined : Promise.reject,
	'%Promise_resolve%': typeof Promise === 'undefined' ? undefined : Promise.resolve,
	'%Proxy%': typeof Proxy === 'undefined' ? undefined : Proxy,
	'%RangeError%': RangeError,
	'%RangeErrorPrototype%': RangeError.prototype,
	'%ReferenceError%': ReferenceError,
	'%ReferenceErrorPrototype%': ReferenceError.prototype,
	'%Reflect%': typeof Reflect === 'undefined' ? undefined : Reflect,
	'%RegExp%': RegExp,
	'%RegExpPrototype%': RegExp.prototype,
	'%Set%': typeof Set === 'undefined' ? undefined : Set,
	'%SetIteratorPrototype%': typeof Set === 'undefined' || !hasSymbols ? undefined : getProto(new Set()[Symbol.iterator]()),
	'%SetPrototype%': typeof Set === 'undefined' ? undefined : Set.prototype,
	'%SharedArrayBuffer%': typeof SharedArrayBuffer === 'undefined' ? undefined : SharedArrayBuffer,
	'%SharedArrayBufferPrototype%': typeof SharedArrayBuffer === 'undefined' ? undefined : SharedArrayBuffer.prototype,
	'%String%': String,
	'%StringIteratorPrototype%': hasSymbols ? getProto(''[Symbol.iterator]()) : undefined,
	'%StringPrototype%': String.prototype,
	'%Symbol%': hasSymbols ? Symbol : undefined,
	'%SymbolPrototype%': hasSymbols ? Symbol.prototype : undefined,
	'%SyntaxError%': SyntaxError,
	'%SyntaxErrorPrototype%': SyntaxError.prototype,
	'%ThrowTypeError%': ThrowTypeError,
	'%TypedArray%': TypedArray,
	'%TypedArrayPrototype%': TypedArray ? TypedArray.prototype : undefined,
	'%TypeError%': $TypeError,
	'%TypeErrorPrototype%': $TypeError.prototype,
	'%Uint8Array%': typeof Uint8Array === 'undefined' ? undefined : Uint8Array,
	'%Uint8ArrayPrototype%': typeof Uint8Array === 'undefined' ? undefined : Uint8Array.prototype,
	'%Uint8ClampedArray%': typeof Uint8ClampedArray === 'undefined' ? undefined : Uint8ClampedArray,
	'%Uint8ClampedArrayPrototype%': typeof Uint8ClampedArray === 'undefined' ? undefined : Uint8ClampedArray.prototype,
	'%Uint16Array%': typeof Uint16Array === 'undefined' ? undefined : Uint16Array,
	'%Uint16ArrayPrototype%': typeof Uint16Array === 'undefined' ? undefined : Uint16Array.prototype,
	'%Uint32Array%': typeof Uint32Array === 'undefined' ? undefined : Uint32Array,
	'%Uint32ArrayPrototype%': typeof Uint32Array === 'undefined' ? undefined : Uint32Array.prototype,
	'%URIError%': URIError,
	'%URIErrorPrototype%': URIError.prototype,
	'%WeakMap%': typeof WeakMap === 'undefined' ? undefined : WeakMap,
	'%WeakMapPrototype%': typeof WeakMap === 'undefined' ? undefined : WeakMap.prototype,
	'%WeakSet%': typeof WeakSet === 'undefined' ? undefined : WeakSet,
	'%WeakSetPrototype%': typeof WeakSet === 'undefined' ? undefined : WeakSet.prototype
};

var bind = require('function-bind');
var $replace = bind.call(Function.call, String.prototype.replace);

/* adapted from https://github.com/lodash/lodash/blob/4.17.15/dist/lodash.js#L6735-L6744 */
var rePropName = /[^%.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|%$))/g;
var reEscapeChar = /\\(\\)?/g; /** Used to match backslashes in property paths. */
var stringToPath = function stringToPath(string) {
	var result = [];
	$replace(string, rePropName, function (match, number, quote, subString) {
		result[result.length] = quote ? $replace(subString, reEscapeChar, '$1') : (number || match);
	});
	return result;
};
/* end adaptation */

var getBaseIntrinsic = function getBaseIntrinsic(name, allowMissing) {
	if (!(name in INTRINSICS)) {
		throw new SyntaxError('intrinsic ' + name + ' does not exist!');
	}

	// istanbul ignore if // hopefully this is impossible to test :-)
	if (typeof INTRINSICS[name] === 'undefined' && !allowMissing) {
		throw new $TypeError('intrinsic ' + name + ' exists, but is not available. Please file an issue!');
	}

	return INTRINSICS[name];
};

module.exports = function GetIntrinsic(name, allowMissing) {
	if (typeof name !== 'string' || name.length === 0) {
		throw new TypeError('intrinsic name must be a non-empty string');
	}
	if (arguments.length > 1 && typeof allowMissing !== 'boolean') {
		throw new TypeError('"allowMissing" argument must be a boolean');
	}

	var parts = stringToPath(name);

	var value = getBaseIntrinsic('%' + (parts.length > 0 ? parts[0] : '') + '%', allowMissing);
	for (var i = 1; i < parts.length; i += 1) {
		if (value != null) {
			if ($gOPD && (i + 1) >= parts.length) {
				var desc = $gOPD(value, parts[i]);
				if (!allowMissing && !(parts[i] in value)) {
					throw new $TypeError('base intrinsic for ' + name + ' exists, but the property is not available.');
				}
				value = desc ? (desc.get || desc.value) : value[parts[i]];
			} else {
				value = value[parts[i]];
			}
		}
	}
	return value;
};