41 lines
877 B
JavaScript
41 lines
877 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var SLOT = require('internal-slot');
|
||
|
|
|
||
|
|
var $SyntaxError = SyntaxError;
|
||
|
|
var $StopIteration = typeof StopIteration === 'object' ? StopIteration : null;
|
||
|
|
|
||
|
|
module.exports = function getStopIterationIterator(origIterator) {
|
||
|
|
if (!$StopIteration) {
|
||
|
|
throw new $SyntaxError('this environment lacks StopIteration');
|
||
|
|
}
|
||
|
|
|
||
|
|
SLOT.set(origIterator, '[[Done]]', false);
|
||
|
|
|
||
|
|
var siIterator = {
|
||
|
|
next: function next() {
|
||
|
|
var iterator = SLOT.get(this, '[[Iterator]]');
|
||
|
|
var done = SLOT.get(iterator, '[[Done]]');
|
||
|
|
try {
|
||
|
|
return {
|
||
|
|
done: done,
|
||
|
|
value: done ? void undefined : iterator.next()
|
||
|
|
};
|
||
|
|
} catch (e) {
|
||
|
|
SLOT.set(iterator, '[[Done]]', true);
|
||
|
|
if (e !== $StopIteration) {
|
||
|
|
throw e;
|
||
|
|
}
|
||
|
|
return {
|
||
|
|
done: true,
|
||
|
|
value: void undefined
|
||
|
|
};
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
SLOT.set(siIterator, '[[Iterator]]', origIterator);
|
||
|
|
|
||
|
|
return siIterator;
|
||
|
|
};
|