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comparison: js/src/tests/ecma_6/Generators/delegating-yield-2.js
js/src/tests/ecma_6/Generators/delegating-yield-2.js
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- 6474c204b198
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| -1:000000000000 | 0:05aa20224c49 |
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| 1 // Test yield* with iter.throw and monkeypatching. | |
| 2 | |
| 3 function* g1() { return (yield 1); } | |
| 4 function* g2() { try { yield 1; } catch (e) { yield e; } } | |
| 5 function* delegate(iter) { return yield* iter; } | |
| 6 var GeneratorObjectPrototype = Object.getPrototypeOf(g1).prototype; | |
| 7 var GeneratorObjectPrototype_throw = GeneratorObjectPrototype.throw; | |
| 8 | |
| 9 // An uncaught delegated throw. | |
| 10 var inner = g1(); | |
| 11 var outer = delegate(inner); | |
| 12 assertIteratorNext(outer, 1); | |
| 13 assertThrowsValue(function () { outer.throw(42) }, 42); | |
| 14 assertThrowsValue(function () { outer.throw(42) }, 42); | |
| 15 | |
| 16 // A caught delegated throw. | |
| 17 inner = g2(); | |
| 18 outer = delegate(inner); | |
| 19 assertIteratorNext(outer, 1); | |
| 20 assertIteratorResult(outer.throw(42), 42, false); | |
| 21 assertThrowsValue(function () { outer.throw(42) }, 42); | |
| 22 assertThrowsValue(function () { outer.throw(42) }, 42); | |
| 23 | |
| 24 // What would be an uncaught delegated throw, but with a monkeypatched iterator. | |
| 25 inner = g1(); | |
| 26 outer = delegate(inner); | |
| 27 assertIteratorNext(outer, 1); | |
| 28 inner.throw = function(e) { return e*2; }; | |
| 29 assertEq(84, outer.throw(42)); | |
| 30 assertIteratorDone(outer, undefined); | |
| 31 | |
| 32 // Monkeypatching inner.next. | |
| 33 inner = g1(); | |
| 34 outer = delegate(inner); | |
| 35 inner.next = function() { return { value: 13, done: true } }; | |
| 36 assertIteratorDone(outer, 13); | |
| 37 | |
| 38 // What would be a caught delegated throw, but with a monkeypunched prototype. | |
| 39 inner = g2(); | |
| 40 outer = delegate(inner); | |
| 41 assertIteratorNext(outer, 1); | |
| 42 delete GeneratorObjectPrototype.throw; | |
| 43 var outer_throw_42 = GeneratorObjectPrototype_throw.bind(outer, 42); | |
| 44 assertThrowsValue(outer_throw_42, 42); | |
| 45 assertThrowsValue(outer_throw_42, 42); | |
| 46 | |
| 47 // Monkeypunch a different throw handler. | |
| 48 inner = g2(); | |
| 49 outer = delegate(inner); | |
| 50 outer_throw_42 = GeneratorObjectPrototype_throw.bind(outer, 42); | |
| 51 assertIteratorNext(outer, 1); | |
| 52 GeneratorObjectPrototype.throw = function(e) { return e*2; } | |
| 53 assertEq(84, outer_throw_42()); | |
| 54 assertEq(84, outer_throw_42()); | |
| 55 // This continues indefinitely. | |
| 56 assertEq(84, outer_throw_42()); | |
| 57 assertIteratorDone(outer, undefined); | |
| 58 | |
| 59 // The same, but restoring the original pre-monkey throw. | |
| 60 inner = g2(); | |
| 61 outer = delegate(inner); | |
| 62 outer_throw_42 = GeneratorObjectPrototype_throw.bind(outer, 42); | |
| 63 assertIteratorNext(outer, 1); | |
| 64 assertEq(84, outer_throw_42()); | |
| 65 assertEq(84, outer_throw_42()); | |
| 66 GeneratorObjectPrototype.throw = GeneratorObjectPrototype_throw; | |
| 67 assertIteratorResult(outer_throw_42(), 42, false); | |
| 68 assertIteratorDone(outer, undefined); | |
| 69 | |
| 70 if (typeof reportCompare == "function") | |
| 71 reportCompare(true, true); |
