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LibWeb: Add ReadableStreamBYOBReader to ReadableStreamReader type

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Matthew Olsson 2023-04-09 01:26:48 -07:00 • committed by Andreas Kling
parent e8ad571082
commit b57b3c54cc
8 changed files with 59 additions and 53 deletions
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87
Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
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@ -12,6 +12,7 @@
#include <LibWeb/Streams/AbstractOperations.h>
#include <LibWeb/Streams/ReadableByteStreamController.h>
#include <LibWeb/Streams/ReadableStream.h>
#include <LibWeb/Streams/ReadableStreamBYOBReader.h>
#include <LibWeb/Streams/ReadableStreamBYOBRequest.h>
#include <LibWeb/Streams/ReadableStreamDefaultController.h>
#include <LibWeb/Streams/ReadableStreamDefaultReader.h>
@ -46,7 +47,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<ReadableStreamDefaultReader>> acquire_reada
bool is_readable_stream_locked(ReadableStream const& stream)
{
// 1. If stream.[[reader]] is undefined, return false.
if (!stream.reader())
if (!stream.reader().has_value())
return false;
// 2. Return true.
@ -75,13 +76,18 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<WebIDL::Promise>> readable_stream_cancel(Re
// 5. Let reader be stream.[[reader]].
auto reader = stream.reader();
// FIXME:
// 6. If reader is not undefined and reader implements ReadableStreamBYOBReader,
// 1. Let readIntoRequests be reader.[[readIntoRequests]].
// 2. Set reader.[[readIntoRequests]] to an empty list.
// 3. For each readIntoRequest of readIntoRequests,
// 1. Perform readIntoRequest’s close steps, given undefined.
(void)reader;
if (reader.has_value() && reader->has<JS::NonnullGCPtr<ReadableStreamBYOBReader>>()) {
// 1. Let readIntoRequests be reader.[[readIntoRequests]].
// 2. Set reader.[[readIntoRequests]] to an empty list.
auto read_into_requests = move(reader->get<JS::NonnullGCPtr<ReadableStreamBYOBReader>>()->read_into_requests());
// 3. For each readIntoRequest of readIntoRequests,
for (auto& read_into_request : read_into_requests) {
// 1. Perform readIntoRequest’s close steps, given undefined.
read_into_request->on_close(JS::js_undefined());
}
}
// 7. Let sourceCancelPromise be ! stream.[[controller]].[[CancelSteps]](reason).
auto source_cancel_promise = TRY(stream.controller()->visit([&](auto const& controller) {
@ -103,14 +109,14 @@ void readable_stream_fulfill_read_request(ReadableStream& stream, JS::Value chun
VERIFY(readable_stream_has_default_reader(stream));
// 2. Let reader be stream.[[reader]].
auto& reader = *stream.reader();
auto reader = stream.reader()->get<JS::NonnullGCPtr<ReadableStreamDefaultReader>>();
// 3. Assert: reader.[[readRequests]] is not empty.
VERIFY(!reader.read_requests().is_empty());
VERIFY(!reader->read_requests().is_empty());
// 4. Let readRequest be reader.[[readRequests]][0].
// 5. Remove readRequest from reader.[[readRequests]].
auto read_request = reader.read_requests().take_first();
auto read_request = reader->read_requests().take_first();
// 6. If done is true, perform readRequest’s close steps.
if (done) {
@ -129,7 +135,7 @@ size_t readable_stream_get_num_read_requests(ReadableStream& stream)
VERIFY(readable_stream_has_default_reader(stream));
// 2. Return stream.[[reader]].[[readRequests]]'s size.
return stream.reader()->read_requests().size();
return stream.reader()->get<JS::NonnullGCPtr<ReadableStreamDefaultReader>>()->read_requests().size();
}
// https://streams.spec.whatwg.org/#readable-stream-has-default-reader
@ -139,11 +145,11 @@ bool readable_stream_has_default_reader(ReadableStream& stream)
auto reader = stream.reader();
// 2. If reader is undefined, return false.
if (!reader)
if (!reader.has_value())
return false;
// 3. If reader implements ReadableStreamDefaultReader, return true.
if (reader->is_default_reader())
if (reader->has<JS::NonnullGCPtr<ReadableStreamDefaultReader>>())
return true;
// 4. Return false.
@ -165,17 +171,19 @@ void readable_stream_close(ReadableStream& stream)
auto reader = stream.reader();
// 4. If reader is undefined, return.
if (!reader)
if (!reader.has_value())
return;
// 5. Resolve reader.[[closedPromise]] with undefined.
WebIDL::resolve_promise(realm, *reader->closed_promise_capability());
WebIDL::resolve_promise(realm, *reader->visit([](auto& reader) {
return reader->closed_promise_capability();
}));
// 6. If reader implements ReadableStreamDefaultReader,
if (reader->is_default_reader()) {
if (reader->has<JS::NonnullGCPtr<ReadableStreamDefaultReader>>()) {
// 1. Let readRequests be reader.[[readRequests]].
// 2. Set reader.[[readRequests]] to an empty list.
auto read_requests = move(reader->read_requests());
auto read_requests = move(reader->get<JS::NonnullGCPtr<ReadableStreamDefaultReader>>()->read_requests());
// 3. For each readRequest of readRequests,
for (auto& read_request : read_requests) {
@ -203,19 +211,21 @@ void readable_stream_error(ReadableStream& stream, JS::Value error)
auto reader = stream.reader();
// 5. If reader is undefined, return.
if (!reader)
if (!reader.has_value())
return;
auto closed_promise_capability = reader->visit([](auto& reader) { return reader->closed_promise_capability(); });
// 6. Reject reader.[[closedPromise]] with e.
WebIDL::reject_promise(realm, *reader->closed_promise_capability(), error);
WebIDL::reject_promise(realm, *closed_promise_capability, error);
// 7. Set reader.[[closedPromise]].[[PromiseIsHandled]] to true.
WebIDL::mark_promise_as_handled(*reader->closed_promise_capability());
WebIDL::mark_promise_as_handled(*closed_promise_capability);
// 8. If reader implements ReadableStreamDefaultReader,
if (reader->is_default_reader()) {
if (reader->has<JS::NonnullGCPtr<ReadableStreamDefaultReader>>()) {
// 1. Perform ! ReadableStreamDefaultReaderErrorReadRequests(reader, e).
readable_stream_default_reader_error_read_requests(*reader, error);
readable_stream_default_reader_error_read_requests(*reader->get<JS::NonnullGCPtr<ReadableStreamDefaultReader>>(), error);
}
// 9. Otherwise,
else {
@ -230,15 +240,14 @@ void readable_stream_error(ReadableStream& stream, JS::Value error)
// https://streams.spec.whatwg.org/#readable-stream-add-read-request
void readable_stream_add_read_request(ReadableStream& stream, ReadRequest const& read_request)
{
// FIXME: Check implementation type
// 1. Assert: stream.[[reader]] implements ReadableStreamDefaultReader.
VERIFY(stream.reader());
VERIFY(stream.reader().has_value() && stream.reader()->has<JS::NonnullGCPtr<ReadableStreamDefaultReader>>());
// 2. Assert: stream.[[state]] is "readable".
VERIFY(stream.state() == ReadableStream::State::Readable);
// 3. Append readRequest to stream.[[reader]].[[readRequests]].
stream.reader()->read_requests().append(read_request);
stream.reader()->get<JS::NonnullGCPtr<ReadableStreamDefaultReader>>()->read_requests().append(read_request);
}
// https://streams.spec.whatwg.org/#readable-stream-reader-generic-cancel
@ -255,30 +264,27 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<WebIDL::Promise>> readable_stream_reader_ge
}
// https://streams.spec.whatwg.org/#readable-stream-reader-generic-initialize
void readable_stream_reader_generic_initialize(ReadableStreamGenericReaderMixin& reader, ReadableStream& stream)
void readable_stream_reader_generic_initialize(ReadableStreamReader reader, ReadableStream& stream)
{
auto& realm = stream.realm();
// 1. Set reader.[[stream]] to stream.
reader.set_stream(stream);
reader.visit([&](auto& reader) { reader->set_stream(stream); });
// 2. Set stream.[[reader]] to reader.
if (reader.is_default_reader()) {
stream.set_reader(static_cast<ReadableStreamDefaultReader&>(reader));
} else {
// FIXME: Handle other descendents of ReadableStreamGenericReaderMixin (i.e. BYOBReader)
TODO();
}
stream.set_reader(reader);
// 3. If stream.[[state]] is "readable",
if (stream.state() == ReadableStream::State::Readable) {
// 1. Set reader.[[closedPromise]] to a new promise.
reader.set_closed_promise_capability(WebIDL::create_promise(realm));
reader.visit([&](auto& reader) { reader->set_closed_promise_capability(WebIDL::create_promise(realm)); });
}
// 4. Otherwise, if stream.[[state]] is "closed",
else if (stream.state() == ReadableStream::State::Closed) {
// 1. Set reader.[[closedPromise]] to a promise resolved with undefined.
reader.set_closed_promise_capability(WebIDL::create_resolved_promise(realm, JS::js_undefined()));
reader.visit([&](auto& reader) {
reader->set_closed_promise_capability(WebIDL::create_resolved_promise(realm, JS::js_undefined()));
});
}
// 5. Otherwise,
else {
@ -286,10 +292,11 @@ void readable_stream_reader_generic_initialize(ReadableStreamGenericReaderMixin&
VERIFY(stream.state() == ReadableStream::State::Errored);
// 2. Set reader.[[closedPromise]] to a promise rejected with stream.[[storedError]].
reader.set_closed_promise_capability(WebIDL::create_rejected_promise(realm, stream.stored_error()));
// 3. Set reader.[[closedPromise]].[[PromiseIsHandled]] to true.
WebIDL::mark_promise_as_handled(*reader.closed_promise_capability());
reader.visit([&](auto& reader) {
reader->set_closed_promise_capability(WebIDL::create_rejected_promise(realm, stream.stored_error()));
WebIDL::mark_promise_as_handled(*reader->closed_promise_capability());
});
}
}
@ -303,7 +310,7 @@ WebIDL::ExceptionOr<void> readable_stream_reader_generic_release(ReadableStreamG
VERIFY(stream);
// 3. Assert: stream.[[reader]] is reader.
VERIFY(stream->reader().ptr() == &reader);
VERIFY(stream->reader()->visit([](auto& reader) -> ReadableStreamGenericReaderMixin* { return reader.ptr(); }) == &reader);
auto& realm = stream->realm();
@ -406,7 +413,7 @@ WebIDL::ExceptionOr<void> set_up_readable_stream_default_reader(ReadableStreamDe
// 2. Perform ! ReadableStreamReaderGenericInitialize(reader, stream).
// 3. Set reader.[[readRequests]] to a new empty list.
readable_stream_reader_generic_initialize(reader, stream);
readable_stream_reader_generic_initialize(ReadableStreamReader { reader }, stream);
return {};
}