| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-generator-function-definitions-runtime-semantics-evaluation |
| es6id: 14.4.14 |
| description: Value received from invocation of generator's `next` method |
| info: | |
| YieldExpression : yield * AssignmentExpression |
| |
| 1. Let exprRef be the result of evaluating AssignmentExpression. |
| 2. Let value be ? GetValue(exprRef). |
| 3. Let iterator be ? GetIterator(value). |
| 4. Let received be NormalCompletion(undefined). |
| 5. Repeat |
| a. If received.[[Type]] is normal, then |
| i. Let innerResult be ? IteratorNext(iterator, received.[[Value]]). |
| ii. Let done be ? IteratorComplete(innerResult). |
| iii. If done is true, then |
| 1. Return ? IteratorValue(innerResult). |
| |
| 7.4.4 IteratorValue |
| |
| 1. Assert: Type(iterResult) is Object. |
| 2. Return ? Get(iterResult, "value"). |
| features: [generators, Symbol.iterator] |
| ---*/ |
| |
| var quickIter = {}; |
| var exprValue, nextReceived, done, iter; |
| quickIter[Symbol.iterator] = function() { |
| return { |
| next: function(x) { |
| nextReceived = x; |
| return { |
| done: done, |
| value: 3333 |
| }; |
| } |
| }; |
| }; |
| function* g() { |
| exprValue = yield * quickIter; |
| } |
| |
| done = true; |
| iter = g(); |
| iter.next(4444); |
| |
| assert.sameValue( |
| nextReceived, undefined, 'received value (previously-exhausted iterator)' |
| ); |
| assert.sameValue(exprValue, 3333, 'expression value (previously-exhausted iterator)'); |
| |
| done = false; |
| exprValue = null; |
| iter = g(); |
| iter.next(2222); |
| done = true; |
| iter.next(5555); |
| |
| assert.sameValue(nextReceived, 5555, 'received value'); |
| assert.sameValue(exprValue, 3333, 'expression value'); |