source: imaps-frontend/node_modules/es-abstract/2023/IteratorClose.js@ d565449

'use strict';

var $TypeError = require('es-errors/type');

var Call = require('./Call');
var CompletionRecord = require('./CompletionRecord');
var GetMethod = require('./GetMethod');
var IsCallable = require('./IsCallable');
var Type = require('./Type');

var isIteratorRecord = require('../helpers/records/iterator-record');

// https://262.ecma-international.org/14.0/#sec-iteratorclose

module.exports = function IteratorClose(iteratorRecord, completion) {
        if (!isIteratorRecord(iteratorRecord)) {
                throw new $TypeError('Assertion failed: `iteratorRecord` must be an Iterator Record'); // step 1
        }
        if (Type(iteratorRecord['[[Iterator]]']) !== 'Object') {
                throw new $TypeError('Assertion failed: iteratorRecord.[[Iterator]] must be an Object'); // step 1
        }

        if (!IsCallable(completion) && !(completion instanceof CompletionRecord)) { // step 2
                throw new $TypeError('Assertion failed: completion is not a thunk representing a Completion Record, nor a Completion Record instance');
        }
        var completionThunk = completion instanceof CompletionRecord ? function () { return completion['?'](); } : completion;

        var iterator = iteratorRecord['[[Iterator]]']; // step 3

        var iteratorReturn;
        try {
                iteratorReturn = GetMethod(iterator, 'return'); // step 4
        } catch (e) {
                completionThunk(); // throws if `completion` is a throw completion // step 6
                completionThunk = null; // ensure it's not called twice.
                throw e; // step 7
        }
        if (typeof iteratorReturn === 'undefined') {
                return completionThunk(); // step 5.a - 5.b
        }

        var innerResult;
        try {
                innerResult = Call(iteratorReturn, iterator, []);
        } catch (e) {
                // if we hit here, then "e" is the innerResult completion that needs re-throwing

                completionThunk(); // throws if `completion` is a throw completion // step 6
                completionThunk = null; // ensure it's not called twice.

                // if not, then return the innerResult completion
                throw e; // step 7
        }
        var 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;
};