AsyncIterator, pt 1

Author: rwaldron

harness/iterators.js

@@ -9,7 +9,7 @@ defines: [Test262AsyncIterator, Test262Iterator]
 class Test262Iterator extends Iterator {
   constructor(iterable = []) {
     super();
-    this.iterable = iterable;
+    this.iterable = Array.from(iterable);
     this.nextCalls = 0;
   }
   next() {
@@ -26,7 +26,7 @@ class Test262Iterator extends Iterator {
 class Test262AsyncIterator extends AsyncIterator {
   constructor(iterable = []) {
     super();
-    this.iterable = iterable;
+    this.iterable = Array.from(iterable);
     this.nextCalls = 0;
   }
   async next() {

test/built-ins/AsyncIterator/prototype/asIndexedPairs/abrupt-iterator-get-next.js

@@ -0,0 +1,47 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asynciteratorprototype.asindexedpairs
+description: >
+  Returns abrupt when next accessor is abrupt.
+info: |
+  %AsyncIterator.prototype%.asIndexedPairs ( )
+
+  %AsyncIterator.prototype%.asIndexedPairs is a built-in async generator function which, when called, performs the following prelude steps:
+
+    Let iterated be ? GetIteratorDirect(this value).
+
+  The body of %AsyncIterator.prototype%.asIndexedPairs is composed of the following steps:
+
+    Let index be 0.
+    Let lastValue be undefined.
+    Repeat,
+      Let next be ? Await(? IteratorNext(iterated, lastValue)).
+      ...
+
+includes: [iterators.js]
+features: [async-iteration, iterator-helpers]
+flags: [async]
+---*/
+class Test262AsyncIteratorAbrupt extends Test262AsyncIterator {
+  get next() {
+    throw new Test262Error();
+  }
+}
+
+(async () => {
+  let count = 0;
+  let iterator = new Test262AsyncIteratorAbrupt([0, 1, 2, 3]);
+  assert.sameValue(iterator.nextCalls, 0, 'The value of iterator.nextCalls is 0');
+
+  try {
+    iterator.asIndexedPairs();
+  } catch (e) {
+    count++;
+    assert.sameValue(e instanceof Test262Error, true, 'The result of `(e instanceof Test262Error)` is true');
+  }
+
+  assert.sameValue(count, 1, 'The value of `count` is 1');
+  assert.sameValue(iterator.nextCalls, 0, 'The value of iterator.nextCalls is 0');
+  assert.sameValue(iterator.iterable.length, 4, 'The value of iterator.iterable.length is 4');
+})().then($DONE, $DONE);

test/built-ins/AsyncIterator/prototype/asIndexedPairs/abrupt-iterator-get-return.js

@@ -0,0 +1,64 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asynciteratorprototype.asindexedpairs
+description: >
+  Returns abrupt when return accessor is abrupt.
+info: |
+  %AsyncIterator.prototype%.asIndexedPairs ( )
+
+  %AsyncIterator.prototype%.asIndexedPairs is a built-in async generator function which, when called, performs the following prelude steps:
+
+    Let iterated be ? GetIteratorDirect(this value).
+
+  The body of %AsyncIterator.prototype%.asIndexedPairs is composed of the following steps:
+
+    Let index be 0.
+    Let lastValue be undefined.
+    Repeat,
+      Let next be ? Await(? IteratorNext(iterated, lastValue)).
+      If ? IteratorComplete(next) is true, return undefined.
+      Let value be ? IteratorValue(next).
+      Let pair be ! CreateArrayFromList(« index, value »).
+      Set index to index + 1.
+      Set lastValue to Yield(pair).
+      IfAbruptCloseAsyncIterator(iterated, lastValue).
+
+features: [async-iteration, iterator-helpers]
+flags: [async]
+---*/
+let genCount = 0;
+
+async function* g() {
+  genCount++;
+}
+
+(async () => {
+  let iterator = g().asIndexedPairs();
+  let proto = Object.getPrototypeOf(iterator);
+  let tryCount = 0;
+  let catchCount = 0;
+  let returnCount = 0;
+
+  Object.defineProperty(proto, 'return', {
+    get() {
+      returnCount++;
+      throw new Test262Error();
+    }
+  });
+
+  try {
+    tryCount++;
+    await iterator.next();
+    await iterator.return();
+    tryCount++;
+  } catch (e) {
+    catchCount++;
+    assert.sameValue(e instanceof Test262Error, true, 'The result of `(e instanceof Test262Error)` is true');
+  }
+
+  assert.sameValue(genCount, 1, 'The value of `genCount` is 1');
+  assert.sameValue(tryCount, 1, 'The value of `tryCount` is 1');
+  assert.sameValue(catchCount, 1, 'The value of `catchCount` is 1');
+  assert.sameValue(returnCount, 1, 'The value of `returnCount` is 1');
+})().then($DONE, $DONE);

test/built-ins/AsyncIterator/prototype/asIndexedPairs/abrupt-iterator-next-done.js

@@ -0,0 +1,64 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asynciteratorprototype.asindexedpairs
+description: >
+  Returns abrupt when done accessor is abrupt.
+info: |
+  %AsyncIterator.prototype%.asIndexedPairs ( )
+
+  %AsyncIterator.prototype%.asIndexedPairs is a built-in async generator function which, when called, performs the following prelude steps:
+
+    Let iterated be ? GetIteratorDirect(this value).
+
+  The body of %AsyncIterator.prototype%.asIndexedPairs is composed of the following steps:
+
+    Let index be 0.
+    Let lastValue be undefined.
+    Repeat,
+      Let next be ? Await(? IteratorNext(iterated, lastValue)).
+      If ? IteratorComplete(next) is true, return undefined.
+      ...
+
+includes: [iterators.js]
+features: [async-iteration, iterator-helpers]
+flags: [async]
+---*/
+let doneCount = 0;
+
+class Test262AsyncIteratorAbrupt extends Test262AsyncIterator {
+  async next() {
+    this.nextCalls++;
+
+    return {
+      get done() {
+        doneCount++;
+        throw new Test262Error();
+      },
+
+      value: 1
+    };
+  }
+}
+
+(async () => {
+  let count = 0;
+  let iterator = new Test262AsyncIteratorAbrupt([0, 1, 2, 3]);
+  assert.sameValue(iterator.nextCalls, 0, 'The value of iterator.nextCalls is 0');
+  let indexedPairs = iterator.asIndexedPairs();
+
+  try {
+    count++;
+
+    for await (const [i, v] of indexedPairs) {
+      $DONE('for await body must not be reachable');
+    }
+  } catch (e) {
+    count++;
+    assert.sameValue(e instanceof Test262Error, true, 'The result of `(e instanceof Test262Error)` is true');
+  }
+
+  assert.sameValue(doneCount, 1, 'The value of `doneCount` is 1');
+  assert.sameValue(iterator.nextCalls, 1, 'The value of iterator.nextCalls is 1');
+  assert.sameValue(iterator.iterable.length, 4, 'The value of iterator.iterable.length is 4');
+})().then($DONE, $DONE);

test/built-ins/AsyncIterator/prototype/asIndexedPairs/abrupt-iterator-next-value.js

@@ -0,0 +1,63 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asynciteratorprototype.asindexedpairs
+description: >
+  Returns abrupt when value accessor is abrupt.
+info: |
+  %AsyncIterator.prototype%.asIndexedPairs ( )
+
+  %AsyncIterator.prototype%.asIndexedPairs is a built-in async generator function which, when called, performs the following prelude steps:
+
+    Let iterated be ? GetIteratorDirect(this value).
+
+  The body of %AsyncIterator.prototype%.asIndexedPairs is composed of the following steps:
+
+    Let index be 0.
+    Let lastValue be undefined.
+    Repeat,
+      Let next be ? Await(? IteratorNext(iterated, lastValue)).
+      If ? IteratorComplete(next) is true, return undefined.
+      Let value be ? IteratorValue(next).
+      ...
+
+includes: [iterators.js]
+features: [async-iteration, iterator-helpers]
+flags: [async]
+---*/
+let valueCount = 0;
+
+class Test262AsyncIteratorAbrupt extends Test262AsyncIterator {
+  async next() {
+    this.nextCalls++;
+
+    return {
+      get value() {
+        valueCount++;
+        throw new Test262Error();
+      }
+    };
+  }
+}
+
+(async () => {
+  let count = 0;
+  let iterator = new Test262AsyncIteratorAbrupt([0, 1, 2, 3]);
+  assert.sameValue(iterator.nextCalls, 0, 'The value of iterator.nextCalls is 0');
+  let indexedPairs = iterator.asIndexedPairs();
+
+  try {
+    count++;
+
+    for await (const [i, v] of indexedPairs) {
+      $DONE('for await body must not be reachable');
+    }
+  } catch (e) {
+    count++;
+    assert.sameValue(e instanceof Test262Error, true, 'The result of `(e instanceof Test262Error)` is true');
+  }
+
+  assert.sameValue(valueCount, 1, 'The value of `valueCount` is 1');
+  assert.sameValue(iterator.nextCalls, 1, 'The value of iterator.nextCalls is 1');
+  assert.sameValue(iterator.iterable.length, 4, 'The value of iterator.iterable.length is 4');
+})().then($DONE, $DONE);

test/built-ins/AsyncIterator/prototype/asIndexedPairs/abrupt-iterator-next.js

@@ -0,0 +1,51 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asynciteratorprototype.asindexedpairs
+description: >
+  Returns abrupt when next call is abrupt.
+info: |
+  %AsyncIterator.prototype%.asIndexedPairs ( )
+
+  %AsyncIterator.prototype%.asIndexedPairs is a built-in async generator function which, when called, performs the following prelude steps:
+
+    Let iterated be ? GetIteratorDirect(this value).
+
+  The body of %AsyncIterator.prototype%.asIndexedPairs is composed of the following steps:
+
+    Let index be 0.
+    Let lastValue be undefined.
+    Repeat,
+      Let next be ? Await(? IteratorNext(iterated, lastValue)).
+      ...
+
+includes: [iterators.js]
+features: [async-iteration, iterator-helpers]
+flags: [async]
+---*/
+class Test262AsyncIteratorAbrupt extends Test262AsyncIterator {
+  async next() {
+    throw new Test262Error();
+  }
+}
+
+(async () => {
+  let count = 0;
+  let iterator = new Test262AsyncIteratorAbrupt([0, 1, 2, 3]);
+  assert.sameValue(iterator.nextCalls, 0, 'The value of iterator.nextCalls is 0');
+  let indexedPairs = iterator.asIndexedPairs();
+
+  try {
+    count++;
+
+    for await (const [i, v] of indexedPairs) {
+      $DONE('for await body must not be reachable');
+    }
+  } catch (e) {
+    count++;
+    assert.sameValue(e instanceof Test262Error, true, 'The result of `(e instanceof Test262Error)` is true');
+  }
+
+  assert.sameValue(iterator.nextCalls, 0, 'The value of iterator.nextCalls is 0');
+  assert.sameValue(iterator.iterable.length, 4, 'The value of iterator.iterable.length is 4');
+})().then($DONE, $DONE);

test/built-ins/AsyncIterator/prototype/asIndexedPairs/abrupt-iterator-return.js

@@ -0,0 +1,63 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asynciteratorprototype.asindexedpairs
+description: >
+  Returns abrupt when return call is abrupt.
+info: |
+  %AsyncIterator.prototype%.asIndexedPairs ( )
+
+  %AsyncIterator.prototype%.asIndexedPairs is a built-in async generator function which, when called, performs the following prelude steps:
+
+    Let iterated be ? GetIteratorDirect(this value).
+
+  The body of %AsyncIterator.prototype%.asIndexedPairs is composed of the following steps:
+
+    Let index be 0.
+    Let lastValue be undefined.
+    Repeat,
+      Let next be ? Await(? IteratorNext(iterated, lastValue)).
+      If ? IteratorComplete(next) is true, return undefined.
+      Let value be ? IteratorValue(next).
+      Let pair be ! CreateArrayFromList(« index, value »).
+      Set index to index + 1.
+      Set lastValue to Yield(pair).
+      IfAbruptCloseAsyncIterator(iterated, lastValue).
+
+
+features: [async-iteration, iterator-helpers]
+flags: [async]
+---*/
+let genCount = 0;
+
+async function* g() {
+  genCount++;
+  yield 1;
+  genCount++;
+  throw new Test262Error();
+}
+
+(async () => {
+  let iterator = g().asIndexedPairs();
+  let tryCount = 0;
+  let catchCount = 0;
+  let forAwaitCount = 0;
+
+  try {
+    tryCount++;
+
+    for await (const [i, v] of iterator) {
+      forAwaitCount++;
+    }
+
+    tryCount++;
+  } catch (e) {
+    catchCount++;
+    assert.sameValue(e instanceof Test262Error, true, 'The result of `(e instanceof Test262Error)` is true');
+  }
+
+  assert.sameValue(genCount, 2, 'The value of `genCount` is 2');
+  assert.sameValue(tryCount, 1, 'The value of `tryCount` is 1');
+  assert.sameValue(catchCount, 1, 'The value of `catchCount` is 1');
+  assert.sameValue(forAwaitCount, 1, 'The value of `forAwaitCount` is 1');
+})().then($DONE, $DONE);