68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var Call = require('es-abstract/2022/Call');
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var CompletionRecord = require('es-abstract/2022/CompletionRecord');
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var GetMethod = require('es-abstract/2022/GetMethod');
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var Type = require('es-abstract/2022/Type');
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var assertRecord = require('es-abstract/helpers/assertRecord');
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// https://262.ecma-international.org/14.0/#sec-iteratorclose
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module.exports = function IteratorClose(iteratorRecord, completion) {
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assertRecord(Type, 'Iterator Record', 'iteratorRecord', iteratorRecord);
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if (Type(iteratorRecord['[[Iterator]]']) !== 'Object') {
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throw new $TypeError('Assertion failed: iteratorRecord.[[Iterator]] must be an Object'); // step 1
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}
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if (!(completion instanceof CompletionRecord)) { // step 2
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throw new $TypeError('Assertion failed: completion is not a Completion Record instance');
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}
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var completionThunk = function () {
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var value = completion.value();
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if (completion.type() === 'throw') {
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throw value;
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}
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return value;
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};
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var iterator = iteratorRecord['[[Iterator]]']; // step 3
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var iteratorReturn;
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try {
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iteratorReturn = GetMethod(iterator, 'return'); // step 4
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} catch (e) {
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completionThunk(); // throws if `completion` is a throw completion // step 6
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completionThunk = null; // ensure it's not called twice.
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throw e; // step 7
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}
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if (typeof iteratorReturn === 'undefined') {
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return completionThunk(); // step 5.a - 5.b
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}
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var innerResult;
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try {
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innerResult = Call(iteratorReturn, iterator, []);
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} catch (e) {
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// if we hit here, then "e" is the innerResult completion that needs re-throwing
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completionThunk(); // throws if `completion` is a throw completion // step 6
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completionThunk = null; // ensure it's not called twice.
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// if not, then return the innerResult completion
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throw e; // step 7
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}
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var completionRecord = completionThunk(); // if innerResult worked, then throw if the completion does
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completionThunk = null; // ensure it's not called twice.
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if (Type(innerResult) !== 'Object') {
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throw new $TypeError('iterator .return must return an object');
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}
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return completionRecord;
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};
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