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// Copyright 2017 Tooru Fujisawa. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
template: default
desc: execution order for yield* with sync iterator and throw()
info: |
YieldExpression: yield * AssignmentExpression
...
6. Repeat
...
b. Else if received.[[Type]] is throw, then
i. Let throw be ? GetMethod(iterator, "throw").
ii. If throw is not undefined, then
1. Let innerResult be ? Call(throw, iterator, « received.[[Value]] »).
2. If generatorKind is async, then set innerResult to
? Await(innerResult).
...
5. Let done be ? IteratorComplete(innerResult).
6. If done is true, then
a. Return ? IteratorValue(innerResult).
7. Let received be GeneratorYield(innerResult).
...
%AsyncFromSyncIteratorPrototype%.throw ( value )
...
5. Let throw be GetMethod(syncIterator, "throw").
...
8. Let throwResult be Call(throw, syncIterator, « value »).
...
11. Let throwValue be IteratorValue(throwResult).
...
13. Let throwDone be IteratorComplete(throwResult).
...
16. Perform ! Call(valueWrapperCapability.[[Resolve]], undefined,
« throwValue »).
...
18. Set onFulfilled.[[Done]] to throwDone.
19. Perform ! PerformPromiseThen(valueWrapperCapability.[[Promise]],
onFulfilled, undefined, promiseCapability).
...
flags: [async]
features: [Symbol.iterator, async-iteration]
---*/
//- setup
var log = [];
var obj = {
[Symbol.iterator]() {
var throwCount = 0;
return {
name: "syncIterator",
get next() {
log.push({ name: "get next" });
return function() {
return {
value: "next-value-1",
done: false
};
};
},
get throw() {
log.push({
name: "get throw",
thisValue: this
});
return function() {
log.push({
name: "call throw",
thisValue: this,
args: [...arguments]
});
throwCount++;
if (throwCount == 1) {
return {
name: "throw-result-1",
get value() {
log.push({
name: "get throw value (1)",
thisValue: this
});
return "throw-value-1";
},
get done() {
log.push({
name: "get throw done (1)",
thisValue: this
});
return false;
}
};
}
return {
name: "throw-result-2",
get value() {
log.push({
name: "get throw value (2)",
thisValue: this
});
return "throw-value-2";
},
get done() {
log.push({
name: "get throw done (2)",
thisValue: this
});
return true;
}
};
};
}
};
}
};
//- body
log.push({ name: "before yield*" });
var v = yield* obj;
log.push({
name: "after yield*",
value: v
});
return "return-value";
//- assertions
assert.sameValue(log.length, 0, "log.length");
iter.next().then(v => {
assert.sameValue(log[0].name, "before yield*");
assert.sameValue(log[1].name, "get next");
assert.sameValue(v.value, "next-value-1");
assert.sameValue(v.done, false);
assert.sameValue(log.length, 2, "log.length");
iter.throw("throw-arg-1").then(v => {
assert.sameValue(log[2].name, "get throw");
assert.sameValue(log[2].thisValue.name, "syncIterator", "get throw thisValue");
assert.sameValue(log[3].name, "call throw");
assert.sameValue(log[3].thisValue.name, "syncIterator", "throw thisValue");
assert.sameValue(log[3].args.length, 1, "throw args.length");
assert.sameValue(log[3].args[0], "throw-arg-1", "throw args[0]");
assert.sameValue(log[4].name, "get throw done (1)");
assert.sameValue(log[4].thisValue.name, "throw-result-1", "get throw done thisValue");
assert.sameValue(log[5].name, "get throw value (1)");
assert.sameValue(log[5].thisValue.name, "throw-result-1", "get throw value thisValue");
assert.sameValue(v.value, "throw-value-1");
assert.sameValue(v.done, false);
assert.sameValue(log.length, 6, "log.length");
iter.throw("throw-arg-2").then(v => {
assert.sameValue(log[6].name, "get throw");
assert.sameValue(log[6].thisValue.name, "syncIterator", "get throw thisValue");
assert.sameValue(log[7].name, "call throw");
assert.sameValue(log[7].thisValue.name, "syncIterator", "throw thisValue");
assert.sameValue(log[7].args.length, 1, "throw args.length");
assert.sameValue(log[7].args[0], "throw-arg-2", "throw args[0]");
assert.sameValue(log[8].name, "get throw done (2)");
assert.sameValue(log[8].thisValue.name, "throw-result-2", "get throw done thisValue");
assert.sameValue(log[9].name, "get throw value (2)");
assert.sameValue(log[9].thisValue.name, "throw-result-2", "get throw value thisValue");
assert.sameValue(log[10].name, "after yield*");
assert.sameValue(log[10].value, "throw-value-2");
assert.sameValue(v.value, "return-value");
assert.sameValue(v.done, true);
assert.sameValue(log.length, 11, "log.length");
}).then($DONE, $DONE);
}).catch($DONE);
}).catch($DONE);
|
