js/src/jit-test/tests/for-of/next-shenanigans.js@6474c204b198 (annotated)
js/src/jit-test/tests/for-of/next-shenanigans.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Test for-of with iter.next and monkeypatching. |
| michael@0 | 2 | |
| michael@0 | 3 | function* g(n) { for (var i=0; i<n; i++) yield i; } |
| michael@0 | 4 | var GeneratorObjectPrototype = Object.getPrototypeOf(g).prototype; |
| michael@0 | 5 | var GeneratorObjectPrototype_next = GeneratorObjectPrototype.next; |
| michael@0 | 6 | |
| michael@0 | 7 | // Monkeypatch next on an iterator. |
| michael@0 | 8 | var inner = g(20); |
| michael@0 | 9 | var n = 0; |
| michael@0 | 10 | for (let x of inner) { |
| michael@0 | 11 | if (n == 0) { |
| michael@0 | 12 | assertEq(x, n++); |
| michael@0 | 13 | } else if (n == 1) { |
| michael@0 | 14 | assertEq(x, n++); |
| michael@0 | 15 | inner.next = function() { return { value: 42, done: false }; }; |
| michael@0 | 16 | } else if (n == 2) { |
| michael@0 | 17 | assertEq(x, 42); |
| michael@0 | 18 | inner.next = function() { return { value: 100, done: true }; }; |
| michael@0 | 19 | } else |
| michael@0 | 20 | throw 'not reached'; |
| michael@0 | 21 | } |
| michael@0 | 22 | |
| michael@0 | 23 | // Monkeypatch next on the prototype. |
| michael@0 | 24 | var inner = g(20); |
| michael@0 | 25 | var n = 0; |
| michael@0 | 26 | for (let x of inner) { |
| michael@0 | 27 | if (n == 0) { |
| michael@0 | 28 | assertEq(x, n++); |
| michael@0 | 29 | } else if (n == 1) { |
| michael@0 | 30 | assertEq(x, n++); |
| michael@0 | 31 | GeneratorObjectPrototype.next = |
| michael@0 | 32 | function() { return { value: 42, done: false }; }; |
| michael@0 | 33 | } else if (n == 2) { |
| michael@0 | 34 | n++; |
| michael@0 | 35 | assertEq(x, 42); |
| michael@0 | 36 | GeneratorObjectPrototype.next = GeneratorObjectPrototype_next; |
| michael@0 | 37 | } else if (n <= 20) { |
| michael@0 | 38 | assertEq(x, n++ - 1); |
| michael@0 | 39 | } else |
| michael@0 | 40 | throw 'not reached'; |
| michael@0 | 41 | } |
