63 lines
1.7 KiB
JavaScript
63 lines
1.7 KiB
JavaScript
'use strict';
|
|
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
|
|
var $SyntaxError = GetIntrinsic('%SyntaxError%');
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
|
var $Promise = GetIntrinsic('%Promise%', true);
|
|
|
|
var Call = require('./Call');
|
|
var CompletionRecord = require('./CompletionRecord');
|
|
var GetMethod = require('./GetMethod');
|
|
var Type = require('./Type');
|
|
|
|
var assertRecord = require('../helpers/assertRecord');
|
|
|
|
var callBound = require('call-bind/callBound');
|
|
|
|
var $then = callBound('Promise.prototype.then', true);
|
|
|
|
// https://262.ecma-international.org/9.0/#sec-asynciteratorclose
|
|
|
|
module.exports = function AsyncIteratorClose(iteratorRecord, completion) {
|
|
assertRecord(Type, 'Iterator Record', 'iteratorRecord', iteratorRecord); // step 1
|
|
|
|
if (!(completion instanceof CompletionRecord)) {
|
|
throw new $TypeError('Assertion failed: completion is not a Completion Record instance'); // step 2
|
|
}
|
|
|
|
if (!$then) {
|
|
throw new $SyntaxError('This environment does not support Promises.');
|
|
}
|
|
|
|
var iterator = iteratorRecord['[[Iterator]]']; // step 3
|
|
|
|
return new $Promise(function (resolve) {
|
|
var ret = GetMethod(iterator, 'return'); // step 4
|
|
|
|
if (typeof ret === 'undefined') {
|
|
resolve(completion); // step 5
|
|
} else {
|
|
resolve($then(
|
|
new $Promise(function (resolve2) {
|
|
// process.exit(42);
|
|
resolve2(Call(ret, iterator, [])); // step 6
|
|
}),
|
|
function (innerResult) {
|
|
if (Type(innerResult) !== 'Object') {
|
|
throw new $TypeError('`innerResult` must be an Object'); // step 10
|
|
}
|
|
return completion;
|
|
},
|
|
function (e) {
|
|
if (completion.type() === 'throw') {
|
|
completion['?'](); // step 8
|
|
} else {
|
|
throw e; // step 9
|
|
}
|
|
}
|
|
));
|
|
}
|
|
});
|
|
};
|