256 lines
8.2 KiB
JavaScript
256 lines
8.2 KiB
JavaScript
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'use strict';
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var GetIntrinsic = require('./GetIntrinsic');
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var keys = require('object-keys');
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var inspect = require('object-inspect');
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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 callBind = require('./helpers/callBind');
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var every = require('./helpers/every');
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var $String = GetIntrinsic('%String%');
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var $Object = GetIntrinsic('%Object%');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $RegExp = GetIntrinsic('%RegExp%');
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var $SymbolProto = GetIntrinsic('%SymbolPrototype%', true);
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var $SymbolValueOf = $SymbolProto ? callBind($SymbolProto.valueOf) : null;
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var $StringProto = GetIntrinsic('%StringPrototype%');
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var $charAt = callBind($StringProto.charAt);
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var strSlice = callBind($StringProto.slice);
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var $indexOf = callBind($StringProto.indexOf);
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var $parseInt = parseInt;
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var isDigit = callBind($RegExp.prototype.test, /^[0-9]$/);
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var $PromiseResolveOrig = GetIntrinsic('%Promise_resolve%', true);
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var $PromiseResolve = $PromiseResolveOrig ? callBind($PromiseResolveOrig) : null;
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var $isEnumerable = callBind(GetIntrinsic('%ObjectPrototype%').propertyIsEnumerable);
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var $pushApply = callBind.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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// http://www.ecma-international.org/ecma-262/9.0/#sec-getsubstitution
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// eslint-disable-next-line max-statements, max-params, max-lines-per-function
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GetSubstitution: function GetSubstitution(matched, str, position, captures, namedCaptures, replacement) {
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if (this.Type(matched) !== 'String') {
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throw new $TypeError('Assertion failed: `matched` must be a String');
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}
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var matchLength = matched.length;
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if (this.Type(str) !== 'String') {
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throw new $TypeError('Assertion failed: `str` must be a String');
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}
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var stringLength = str.length;
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if (!this.IsInteger(position) || position < 0 || position > stringLength) {
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throw new $TypeError('Assertion failed: `position` must be a nonnegative integer, and less than or equal to the length of `string`, got ' + inspect(position));
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}
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var ES = this;
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var isStringOrHole = function (capture, index, arr) { return ES.Type(capture) === 'String' || !(index in arr); };
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if (!this.IsArray(captures) || !every(captures, isStringOrHole)) {
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throw new $TypeError('Assertion failed: `captures` must be a List of Strings, got ' + inspect(captures));
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}
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if (this.Type(replacement) !== 'String') {
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throw new $TypeError('Assertion failed: `replacement` must be a String');
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}
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var tailPos = position + matchLength;
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var m = captures.length;
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if (this.Type(namedCaptures) !== 'Undefined') {
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namedCaptures = this.ToObject(namedCaptures); // eslint-disable-line no-param-reassign
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}
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var result = '';
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for (var i = 0; i < replacement.length; i += 1) {
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// if this is a $, and it's not the end of the replacement
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var current = replacement[i];
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var isLast = (i + 1) >= replacement.length;
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var nextIsLast = (i + 2) >= replacement.length;
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if (current === '$' && !isLast) {
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var next = replacement[i + 1];
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if (next === '$') {
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result += '$';
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i += 1;
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} else if (next === '&') {
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result += matched;
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i += 1;
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} else if (next === '`') {
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result += position === 0 ? '' : strSlice(str, 0, position - 1);
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i += 1;
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} else if (next === "'") {
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result += tailPos >= stringLength ? '' : strSlice(str, tailPos);
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i += 1;
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} else {
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var nextNext = nextIsLast ? null : replacement[i + 2];
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if (isDigit(next) && next !== '0' && (nextIsLast || !isDigit(nextNext))) {
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// $1 through $9, and not followed by a digit
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var n = $parseInt(next, 10);
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// if (n > m, impl-defined)
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result += (n <= m && this.Type(captures[n - 1]) === 'Undefined') ? '' : captures[n - 1];
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i += 1;
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} else if (isDigit(next) && (nextIsLast || isDigit(nextNext))) {
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// $00 through $99
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var nn = next + nextNext;
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var nnI = $parseInt(nn, 10) - 1;
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// if nn === '00' or nn > m, impl-defined
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result += (nn <= m && this.Type(captures[nnI]) === 'Undefined') ? '' : captures[nnI];
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i += 2;
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} else if (next === '<') {
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// eslint-disable-next-line max-depth
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if (this.Type(namedCaptures) === 'Undefined') {
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result += '$<';
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i += 2;
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} else {
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var endIndex = $indexOf(replacement, '>', i);
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// eslint-disable-next-line max-depth
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if (endIndex > -1) {
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var groupName = strSlice(replacement, i, endIndex);
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var capture = this.Get(namedCaptures, groupName);
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// eslint-disable-next-line max-depth
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if (this.Type(capture) !== 'Undefined') {
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result += this.ToString(capture);
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}
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i += '$<' + groupName + '>'.length;
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}
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}
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} else {
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result += '$';
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}
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}
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} else {
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// the final $, or else not a $
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result += replacement[i];
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}
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}
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return result;
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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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