yield-star-sync-next.js (6812B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/async-generators/yield-star-sync-next.case 4 // - src/async-generators/default/async-declaration.template 5 /*--- 6 description: execution order for yield* with sync iterator and next() (Async generator Function declaration) 7 esid: prod-AsyncGeneratorDeclaration 8 features: [Symbol.iterator, async-iteration, Symbol.asyncIterator] 9 flags: [generated, async] 10 info: | 11 Async Generator Function Definitions 12 13 AsyncGeneratorDeclaration: 14 async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) { 15 AsyncGeneratorBody } 16 17 18 YieldExpression: yield * AssignmentExpression 19 20 ... 21 2. Let value be ? GetValue(exprRef). 22 3. Let generatorKind be ! GetGeneratorKind(). 23 4. Let iterator be ? GetIterator(value, generatorKind). 24 5. Let received be NormalCompletion(undefined). 25 6. Repeat 26 a. If received.[[Type]] is normal, then 27 i. Let innerResult be ? IteratorNext(iterator, received.[[Value]]). 28 ii. Let innerResult be ? Invoke(iterator, "next", 29 « received.[[Value]] »). 30 iii. If generatorKind is async, then set innerResult to 31 ? Await(innerResult). 32 ... 33 v. Let done be ? IteratorComplete(innerResult). 34 vi. If done is true, then 35 1. Return ? IteratorValue(innerResult). 36 vii. Let received be GeneratorYield(innerResult). 37 ... 38 39 GetIterator ( obj [ , hint ] ) 40 41 ... 42 3. If hint is async, 43 a. Set method to ? GetMethod(obj, @@asyncIterator). 44 b. If method is undefined, 45 i. Let syncMethod be ? GetMethod(obj, @@iterator). 46 ii. Let syncIterator be ? Call(syncMethod, obj). 47 iii. Return ? CreateAsyncFromSyncIterator(syncIterator). 48 ... 49 50 %AsyncFromSyncIteratorPrototype%.next ( value ) 51 52 ... 53 5. Let nextResult be IteratorNext(syncIterator, value). 54 ... 55 7. Let nextValue be IteratorValue(nextResult). 56 ... 57 9. Let nextDone be IteratorComplete(nextResult). 58 ... 59 12. Perform ! Call(valueWrapperCapability.[[Resolve]], undefined, 60 « nextValue »). 61 ... 62 14. Set onFulfilled.[[Done]] to nextDone. 63 15. Perform ! PerformPromiseThen(valueWrapperCapability.[[Promise]], 64 onFulfilled, undefined, promiseCapability). 65 ... 66 67 Async Iterator Value Unwrap Functions 68 69 1. Return ! CreateIterResultObject(value, F.[[Done]]). 70 71 ---*/ 72 var log = []; 73 var obj = { 74 get [Symbol.iterator]() { 75 log.push({ 76 name: "get [Symbol.iterator]", 77 thisValue: this 78 }); 79 return function() { 80 log.push({ 81 name: "call [Symbol.iterator]", 82 thisValue: this, 83 args: [...arguments] 84 }); 85 var nextCount = 0; 86 return { 87 name: "syncIterator", 88 get next() { 89 log.push({ 90 name: "get next", 91 thisValue: this 92 }); 93 return function() { 94 log.push({ 95 name: "call next", 96 thisValue: this, 97 args: [...arguments] 98 }); 99 100 nextCount++; 101 if (nextCount == 1) { 102 return { 103 name: "next-result-1", 104 get value() { 105 log.push({ 106 name: "get next value (1)", 107 thisValue: this 108 }); 109 return "next-value-1"; 110 }, 111 get done() { 112 log.push({ 113 name: "get next done (1)", 114 thisValue: this 115 }); 116 return false; 117 } 118 }; 119 } 120 121 return { 122 name: "next-result-2", 123 get value() { 124 log.push({ 125 name: "get next value (2)", 126 thisValue: this 127 }); 128 return "next-value-2"; 129 }, 130 get done() { 131 log.push({ 132 name: "get next done (2)", 133 thisValue: this 134 }); 135 return true; 136 } 137 }; 138 }; 139 } 140 }; 141 }; 142 }, 143 get [Symbol.asyncIterator]() { 144 log.push({ name: "get [Symbol.asyncIterator]" }); 145 return null; 146 } 147 }; 148 149 150 151 var callCount = 0; 152 153 async function *gen() { 154 callCount += 1; 155 log.push({ name: "before yield*" }); 156 var v = yield* obj; 157 log.push({ 158 name: "after yield*", 159 value: v 160 }); 161 return "return-value"; 162 163 } 164 165 var iter = gen(); 166 167 assert.sameValue(log.length, 0, "log.length"); 168 169 iter.next("next-arg-1").then(v => { 170 assert.sameValue(log[0].name, "before yield*"); 171 172 assert.sameValue(log[1].name, "get [Symbol.asyncIterator]"); 173 174 assert.sameValue(log[2].name, "get [Symbol.iterator]"); 175 assert.sameValue(log[2].thisValue, obj, "get [Symbol.iterator] thisValue"); 176 177 assert.sameValue(log[3].name, "call [Symbol.iterator]"); 178 assert.sameValue(log[3].thisValue, obj, "[Symbol.iterator] thisValue"); 179 assert.sameValue(log[3].args.length, 0, "[Symbol.iterator] args.length"); 180 181 assert.sameValue(log[4].name, "get next"); 182 assert.sameValue(log[4].thisValue.name, "syncIterator", "get next thisValue"); 183 184 assert.sameValue(log[5].name, "call next"); 185 assert.sameValue(log[5].thisValue.name, "syncIterator", "next thisValue"); 186 assert.sameValue(log[5].args.length, 1, "next args.length"); 187 assert.sameValue(log[5].args[0], undefined, "next args[0]"); 188 189 assert.sameValue(log[6].name, "get next done (1)"); 190 assert.sameValue(log[6].thisValue.name, "next-result-1", "get next done thisValue"); 191 192 assert.sameValue(log[7].name, "get next value (1)"); 193 assert.sameValue(log[7].thisValue.name, "next-result-1", "get next value thisValue"); 194 195 assert.sameValue(v.value, "next-value-1"); 196 assert.sameValue(v.done, false); 197 198 assert.sameValue(log.length, 8, "log.length"); 199 200 iter.next("next-arg-2").then(v => { 201 assert.sameValue(log[8].name, "call next"); 202 assert.sameValue(log[8].thisValue.name, "syncIterator", "next thisValue"); 203 assert.sameValue(log[8].args.length, 1, "next args.length"); 204 assert.sameValue(log[8].args[0], "next-arg-2", "next args[0]"); 205 206 assert.sameValue(log[9].name, "get next done (2)"); 207 assert.sameValue(log[9].thisValue.name, "next-result-2", "get next done thisValue"); 208 209 assert.sameValue(log[10].name, "get next value (2)"); 210 assert.sameValue(log[10].thisValue.name, "next-result-2", "get next value thisValue"); 211 212 assert.sameValue(log[11].name, "after yield*"); 213 assert.sameValue(log[11].value, "next-value-2"); 214 215 assert.sameValue(v.value, "return-value"); 216 assert.sameValue(v.done, true); 217 218 assert.sameValue(log.length, 12, "log.length"); 219 }).then($DONE, $DONE); 220 }).catch($DONE); 221 222 assert.sameValue(callCount, 1);