Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 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 | // Flags: --allow-natives-syntax |
| 6 | |
| 7 | (function TestBasics() { |
| 8 | var a = [1, 2]; |
| 9 | var b = [...a]; |
| 10 | assertArrayEquals([1, 2], b) |
| 11 | |
| 12 | assertArrayEquals(['a', 'b', 'c', 'd', 'e', 'f'], |
| 13 | ['a', ...'bc', 'd', ...'ef']) |
| 14 | })(); |
| 15 | |
| 16 | |
| 17 | var log = []; |
| 18 | |
| 19 | function* gen(n) { |
| 20 | log.push(n, 1); |
| 21 | yield 1; |
| 22 | log.push(n, 2); |
| 23 | yield 2; |
| 24 | log.push(n, 3); |
| 25 | yield 3; |
| 26 | log.push(n, 'done'); |
| 27 | } |
| 28 | |
| 29 | function id(v) { |
| 30 | log.push(v); |
| 31 | return v; |
| 32 | } |
| 33 | |
| 34 | |
| 35 | (function TestGenerator() { |
| 36 | assertArrayEquals([1, 2, 3], [...gen('a')]); |
| 37 | assertArrayEquals(['x', 1, 2, 3, 'y', 1, 2, 3, 'z'], |
| 38 | ['x', ...gen('a'), 'y', ...gen('b'), 'z']); |
| 39 | })(); |
| 40 | |
| 41 | |
| 42 | (function TestOrderOfExecution() { |
| 43 | log = []; |
| 44 | assertArrayEquals(['x', 1, 2, 3, 'y', 1, 2, 3, 'z'], |
| 45 | [id('x'), ...gen('a'), id('y'), ...gen('b'), id('z')]); |
| 46 | assertArrayEquals([ |
| 47 | 'x', 'a', 1, 'a', 2, 'a', 3, 'a', 'done', |
| 48 | 'y', 'b', 1, 'b', 2, 'b', 3, 'b', 'done', |
| 49 | 'z' |
| 50 | ], log); |
| 51 | })(); |
| 52 | |
| 53 | |
| 54 | (function TestNotIterable() { |
| 55 | var a; |
| 56 | assertThrows(function() { |
| 57 | a = [...42]; |
| 58 | }, TypeError); |
| 59 | assertSame(undefined, a); |
| 60 | |
| 61 | |
| 62 | })(); |
| 63 | |
| 64 | |
| 65 | (function TestInvalidIterator() { |
| 66 | var iter = { |
| 67 | [Symbol.iterator]: 42 |
| 68 | }; |
| 69 | var a; |
| 70 | assertThrows(function() { |
| 71 | a = [...iter]; |
| 72 | }, TypeError); |
| 73 | assertSame(undefined, a); |
| 74 | })(); |
| 75 | |
| 76 | |
| 77 | (function TestIteratorNotAnObject() { |
| 78 | var iter = { |
| 79 | [Symbol.iterator]() { |
| 80 | return 42; |
| 81 | } |
| 82 | }; |
| 83 | var a; |
| 84 | assertThrows(function() { |
| 85 | a = [...iter]; |
| 86 | }, TypeError); |
| 87 | assertSame(undefined, a); |
| 88 | })(); |
| 89 | |
| 90 | |
| 91 | (function TestIteratorNoNext() { |
| 92 | var iter = { |
| 93 | [Symbol.iterator]() { |
| 94 | return {}; |
| 95 | } |
| 96 | }; |
| 97 | var a; |
| 98 | assertThrows(function() { |
| 99 | a = [...iter]; |
| 100 | }, TypeError); |
| 101 | assertSame(undefined, a); |
| 102 | })(); |
| 103 | |
| 104 | |
| 105 | (function TestIteratorResultDoneThrows() { |
| 106 | function MyError() {} |
| 107 | var iter = { |
| 108 | [Symbol.iterator]() { |
| 109 | return { |
| 110 | next() { |
| 111 | return { |
| 112 | get done() { |
| 113 | throw new MyError(); |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | }; |
| 118 | } |
| 119 | }; |
| 120 | var a; |
| 121 | assertThrows(function() { |
| 122 | a = [...iter]; |
| 123 | }, MyError); |
| 124 | assertSame(undefined, a); |
| 125 | })(); |
| 126 | |
| 127 | |
| 128 | (function TestIteratorResultValueThrows() { |
| 129 | function MyError() {} |
| 130 | var iter = { |
| 131 | [Symbol.iterator]() { |
| 132 | return { |
| 133 | next() { |
| 134 | return { |
| 135 | done: false, |
| 136 | get value() { |
| 137 | throw new MyError(); |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | }; |
| 142 | } |
| 143 | }; |
| 144 | var a; |
| 145 | assertThrows(function() { |
| 146 | a = [...iter]; |
| 147 | }, MyError); |
| 148 | assertSame(undefined, a); |
| 149 | })(); |
| 150 | |
| 151 | |
| 152 | (function TestOptimize() { |
| 153 | function f() { |
| 154 | return [...'abc']; |
| 155 | } |
| 156 | assertArrayEquals(['a', 'b', 'c'], f()); |
| 157 | %OptimizeFunctionOnNextCall(f); |
| 158 | assertArrayEquals(['a', 'b', 'c'], f()); |
| 159 | })(); |
| 160 | |
| 161 | |
| 162 | (function TestDeoptimize() { |
| 163 | var iter = { |
| 164 | [Symbol.iterator]() { |
| 165 | var i = 0; |
| 166 | return { |
| 167 | next() { |
| 168 | $DeoptimizeFunction(f); |
| 169 | return {value: ++i, done: i === 3}; |
| 170 | } |
| 171 | }; |
| 172 | } |
| 173 | }; |
| 174 | function f() { |
| 175 | return [0, ...iter]; |
| 176 | } |
| 177 | |
| 178 | assertArrayEquals([0, 1, 2], f()); |
| 179 | }); |