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| 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); |
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