149 lines
4.3 KiB
JavaScript
149 lines
4.3 KiB
JavaScript
'use strict';
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var bind = require('function-bind');
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var keys = require('object-keys');
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var ES2017 = require('./es2017');
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var assign = require('./helpers/assign');
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var forEach = require('./helpers/forEach');
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var GetIntrinsic = require('./GetIntrinsic');
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var $String = GetIntrinsic('%String%');
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var $Object = GetIntrinsic('%Object%');
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var $SymbolProto = GetIntrinsic('%SymbolPrototype%', true);
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var $SymbolValueOf = $SymbolProto ? bind.call(Function.call, $SymbolProto.valueOf) : null;
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var $StringProto = GetIntrinsic('%StringPrototype%');
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var $charAt = bind.call(Function.call, $StringProto.charAt);
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var $PromiseResolveOrig = GetIntrinsic('%Promise_resolve%', true);
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var $PromiseResolve = $PromiseResolveOrig ? bind.call(Function.call, $PromiseResolveOrig) : null;
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var $isEnumerable = bind.call(Function.call, GetIntrinsic('%ObjectPrototype%').propertyIsEnumerable);
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var $pushApply = bind.call(Function.apply, GetIntrinsic('%ArrayPrototype%').push);
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var $gOPS = $SymbolValueOf ? $Object.getOwnPropertySymbols : null;
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var OwnPropertyKeys = function OwnPropertyKeys(ES, source) {
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var ownKeys = keys(source);
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if ($gOPS) {
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$pushApply(ownKeys, $gOPS(source));
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}
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return ownKeys;
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};
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var ES2018 = assign(assign({}, ES2017), {
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EnumerableOwnPropertyNames: ES2017.EnumerableOwnProperties,
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// https://ecma-international.org/ecma-262/9.0/#sec-thissymbolvalue
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thisSymbolValue: function thisSymbolValue(value) {
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if (!$SymbolValueOf) {
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throw new SyntaxError('Symbols are not supported; thisSymbolValue requires that `value` be a Symbol or a Symbol object');
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}
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if (this.Type(value) === 'Symbol') {
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return value;
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}
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return $SymbolValueOf(value);
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},
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// https://www.ecma-international.org/ecma-262/9.0/#sec-isstringprefix
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IsStringPrefix: function IsStringPrefix(p, q) {
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if (this.Type(p) !== 'String') {
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throw new TypeError('Assertion failed: "p" must be a String');
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}
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if (this.Type(q) !== 'String') {
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throw new TypeError('Assertion failed: "q" must be a String');
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}
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if (p === q || p === '') {
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return true;
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}
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var pLength = p.length;
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var qLength = q.length;
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if (pLength >= qLength) {
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return false;
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}
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// assert: pLength < qLength
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for (var i = 0; i < pLength; i += 1) {
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if ($charAt(p, i) !== $charAt(q, i)) {
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return false;
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}
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}
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return true;
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},
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// https://www.ecma-international.org/ecma-262/9.0/#sec-tostring-applied-to-the-number-type
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NumberToString: function NumberToString(m) {
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if (this.Type(m) !== 'Number') {
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throw new TypeError('Assertion failed: "m" must be a String');
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}
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return $String(m);
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},
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// https://www.ecma-international.org/ecma-262/9.0/#sec-copydataproperties
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CopyDataProperties: function CopyDataProperties(target, source, excludedItems) {
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if (this.Type(target) !== 'Object') {
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throw new TypeError('Assertion failed: "target" must be an Object');
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}
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if (!this.IsArray(excludedItems)) {
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throw new TypeError('Assertion failed: "excludedItems" must be a List of Property Keys');
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}
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for (var i = 0; i < excludedItems.length; i += 1) {
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if (!this.IsPropertyKey(excludedItems[i])) {
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throw new TypeError('Assertion failed: "excludedItems" must be a List of Property Keys');
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}
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}
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if (typeof source === 'undefined' || source === null) {
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return target;
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}
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var ES = this;
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var fromObj = ES.ToObject(source);
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var sourceKeys = OwnPropertyKeys(ES, fromObj);
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forEach(sourceKeys, function (nextKey) {
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var excluded = false;
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forEach(excludedItems, function (e) {
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if (ES.SameValue(e, nextKey) === true) {
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excluded = true;
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}
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});
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var enumerable = $isEnumerable(fromObj, nextKey) || (
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// this is to handle string keys being non-enumerable in older engines
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typeof source === 'string'
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&& nextKey >= 0
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&& ES.IsInteger(ES.ToNumber(nextKey))
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);
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if (excluded === false && enumerable) {
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var propValue = ES.Get(fromObj, nextKey);
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ES.CreateDataProperty(target, nextKey, propValue);
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}
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});
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return target;
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},
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// https://ecma-international.org/ecma-262/9.0/#sec-promise-resolve
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PromiseResolve: function PromiseResolve(C, x) {
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if (!$PromiseResolve) {
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throw new SyntaxError('This environment does not support Promises.');
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}
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return $PromiseResolve(C, x);
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}
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});
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delete ES2018.EnumerableOwnProperties; // replaced with EnumerableOwnPropertyNames
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delete ES2018.IsPropertyDescriptor; // not an actual abstract operation
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module.exports = ES2018;
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