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node_modules/es-abstract/2017/IteratorClose.js
| 50 lines
| 1.4 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var $TypeError = GetIntrinsic('%TypeError%'); | ||||
| var Call = require('./Call'); | ||||
| var GetMethod = require('./GetMethod'); | ||||
| var IsCallable = require('./IsCallable'); | ||||
| var Type = require('./Type'); | ||||
| // https://ecma-international.org/ecma-262/6.0/#sec-iteratorclose | ||||
| module.exports = function IteratorClose(iterator, completion) { | ||||
| if (Type(iterator) !== 'Object') { | ||||
| throw new $TypeError('Assertion failed: Type(iterator) is not Object'); | ||||
| } | ||||
| if (!IsCallable(completion)) { | ||||
| throw new $TypeError('Assertion failed: completion is not a thunk for a Completion Record'); | ||||
| } | ||||
| var completionThunk = completion; | ||||
| var iteratorReturn = GetMethod(iterator, 'return'); | ||||
| if (typeof iteratorReturn === 'undefined') { | ||||
| return completionThunk(); | ||||
| } | ||||
| var completionRecord; | ||||
| try { | ||||
| var innerResult = Call(iteratorReturn, iterator, []); | ||||
| } catch (e) { | ||||
| // if we hit here, then "e" is the innerResult completion that needs re-throwing | ||||
| // if the completion is of type "throw", this will throw. | ||||
| completionThunk(); | ||||
| completionThunk = null; // ensure it's not called twice. | ||||
| // if not, then return the innerResult completion | ||||
| throw e; | ||||
| } | ||||
| completionRecord = completionThunk(); // if innerResult worked, then throw if the completion does | ||||
| completionThunk = null; // ensure it's not called twice. | ||||
| if (Type(innerResult) !== 'Object') { | ||||
| throw new $TypeError('iterator .return must return an object'); | ||||
| } | ||||
| return completionRecord; | ||||
| }; | ||||