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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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