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LibWeb: Add ReadableStream.locked/cancel()/getReader()

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Matthew Olsson 2023-03-28 20:01:04 -07:00 • committed by Linus Groh
parent d8710aa604
commit 36ca1386e8
6 changed files with 63 additions and 1 deletions
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32
Userland/Libraries/LibWeb/Streams/ReadableStream.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/PromiseCapability.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Streams/AbstractOperations.h>
#include <LibWeb/Streams/ReadableStream.h>
@ -60,6 +61,37 @@ ReadableStream::ReadableStream(JS::Realm& realm)
ReadableStream::~ReadableStream() = default;
// https://streams.spec.whatwg.org/#rs-locked
bool ReadableStream::locked()
{
// 1. Return ! IsReadableStreamLocked(this).
return is_readable_stream_locked(*this);
}
// https://streams.spec.whatwg.org/#rs-cancel
WebIDL::ExceptionOr<JS::GCPtr<JS::Object>> ReadableStream::cancel(JS::Value reason)
{
// 1. If ! IsReadableStreamLocked(this) is true, return a promise rejected with a TypeError exception.
if (is_readable_stream_locked(*this)) {
auto exception = MUST_OR_THROW_OOM(JS::TypeError::create(realm(), "Cannot cancel a locked stream"sv));
return WebIDL::create_rejected_promise(realm(), JS::Value { exception })->promise();
}
// 2. Return ! ReadableStreamCancel(this, reason).
return TRY(readable_stream_cancel(*this, reason))->promise();
}
// https://streams.spec.whatwg.org/#rs-get-reader
WebIDL::ExceptionOr<ReadableStreamReader> ReadableStream::get_reader()
{
// FIXME:
// 1. If options["mode"] does not exist, return ? AcquireReadableStreamDefaultReader(this).
// 2. Assert: options["mode"] is "byob".
// 3. Return ? AcquireReadableStreamBYOBReader(this).
return TRY(acquire_readable_stream_default_reader(*this));
}
JS::ThrowCompletionOr<void> ReadableStream::initialize(JS::Realm& realm)
{
MUST_OR_THROW_OOM(Base::initialize(realm));