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50 lines
1.4 KiB
50 lines
1.4 KiB
'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('./Call');
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var GetMethod = require('./GetMethod');
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var IsCallable = require('./IsCallable');
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var Type = require('./Type');
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// https://ecma-international.org/ecma-262/6.0/#sec-iteratorclose
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module.exports = function IteratorClose(iterator, completion) {
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if (Type(iterator) !== 'Object') {
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throw new $TypeError('Assertion failed: Type(iterator) is not Object');
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}
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if (!IsCallable(completion)) {
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throw new $TypeError('Assertion failed: completion is not a thunk for a Completion Record');
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}
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var completionThunk = completion;
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var iteratorReturn = GetMethod(iterator, 'return');
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if (typeof iteratorReturn === 'undefined') {
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return completionThunk();
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}
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var completionRecord;
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try {
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var 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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// if the completion is of type "throw", this will throw.
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completionThunk();
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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;
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}
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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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