Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Test generator states. |
| 6 | |
| 7 | function Foo() {} |
| 8 | function Bar() {} |
| 9 | |
| 10 | function assertIteratorResult(value, done, result) { |
| 11 | assertEquals({ value: value, done: done}, result); |
| 12 | } |
| 13 | |
| 14 | function assertIteratorIsClosed(iter) { |
| 15 | assertIteratorResult(undefined, true, iter.next()); |
| 16 | // Next and throw on a closed iterator. |
| 17 | assertDoesNotThrow(function() { iter.next(); }); |
| 18 | assertThrows(function() { iter.throw(new Bar); }, Bar); |
| 19 | } |
| 20 | |
| 21 | var iter; |
| 22 | function* nextGenerator() { yield iter.next(); } |
| 23 | function* throwGenerator() { yield iter.throw(new Bar); } |
| 24 | |
| 25 | // Throw on a suspendedStart iterator. |
| 26 | iter = nextGenerator(); |
| 27 | assertThrows(function() { iter.throw(new Foo) }, Foo) |
| 28 | assertThrows(function() { iter.throw(new Foo) }, Foo) |
| 29 | assertIteratorIsClosed(iter); |
| 30 | |
| 31 | // The same. |
| 32 | iter = throwGenerator(); |
| 33 | assertThrows(function() { iter.throw(new Foo) }, Foo) |
| 34 | assertThrows(function() { iter.throw(new Foo) }, Foo) |
| 35 | assertIteratorIsClosed(iter); |
| 36 | |
| 37 | // Next on an executing iterator raises a TypeError. |
| 38 | iter = nextGenerator(); |
| 39 | assertThrows(function() { iter.next() }, TypeError) |
| 40 | assertIteratorIsClosed(iter); |
| 41 | |
| 42 | // Throw on an executing iterator raises a TypeError. |
| 43 | iter = throwGenerator(); |
| 44 | assertThrows(function() { iter.next() }, TypeError) |
| 45 | assertIteratorIsClosed(iter); |
| 46 | |
| 47 | // Next on an executing iterator doesn't change the state of the |
| 48 | // generator. |
| 49 | iter = (function* () { |
| 50 | try { |
| 51 | iter.next(); |
| 52 | yield 1; |
| 53 | } catch (e) { |
| 54 | try { |
| 55 | // This next() should raise the same exception, because the first |
| 56 | // next() left the iter in the executing state. |
| 57 | iter.next(); |
| 58 | yield 2; |
| 59 | } catch (e) { |
| 60 | yield 3; |
| 61 | } |
| 62 | } |
| 63 | yield 4; |
| 64 | })(); |
| 65 | assertIteratorResult(3, false, iter.next()); |
| 66 | assertIteratorResult(4, false, iter.next()); |
| 67 | assertIteratorIsClosed(iter); |