mirror of https://github.com/tc39/test262.git
72 lines
2.2 KiB
JavaScript
72 lines
2.2 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-generator-function-definitions-runtime-semantics-evaluation
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es6id: 14.4.14
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description: Value received from invocation of generator's `return` method
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info: |
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YieldExpression : yield * AssignmentExpression
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1. Let exprRef be the result of evaluating AssignmentExpression.
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2. Let value be ? GetValue(exprRef).
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3. Let iterator be ? GetIterator(value).
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4. Let received be NormalCompletion(undefined).
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5. Repeat
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a. If received.[[Type]] is normal, then
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[...]
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b. Else if received.[[Type]] is throw, then
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[...]
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c. Else,
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i. Assert: received.[[Type]] is return.
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ii. Let return be ? GetMethod(iterator, "return").
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iii. If return is undefined, return Completion(received).
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iv. Let innerReturnResult be ? Call(return, iterator, «
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received.[[Value]] »).
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v. If Type(innerReturnResult) is not Object, throw a TypeError
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exception.
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vi. Let done be ? IteratorComplete(innerReturnResult).
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vii. If done is true, then
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1. Let value be ? IteratorValue(innerReturnResult).
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2. Return Completion{[[Type]]: return, [[Value]]: value,
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[[Target]]: empty}.
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viii. Let received be GeneratorYield(innerReturnResult).
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features: [generators, Symbol.iterator]
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---*/
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var quickIter = {};
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var normalCompletion = false;
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var errorCompletion = false;
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var delegationComplete = false;
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var iter, returnReceived;
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quickIter[Symbol.iterator] = function() {
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return {
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next: function() {
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return { done: false };
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},
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return: function(x) {
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returnReceived = x;
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return { done: true, value: 3333 };
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}
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};
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};
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function* g() {
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try {
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yield * quickIter;
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normalCompletion = true;
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} catch (e) {
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errorCompletion = true;
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} finally {
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delegationComplete = true;
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}
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}
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iter = g();
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iter.next();
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iter.return(2222);
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assert.sameValue(returnReceived, 2222);
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assert.sameValue(delegationComplete, true, 'delegation complete');
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assert.sameValue(normalCompletion, false, 'completion was abrupt');
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assert.sameValue(errorCompletion, false, 'completion was not of type "throw"');
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