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LibWeb: Start fleshing out the ReadableStream interface

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This is so we can just assume it exists in Fetch APIs (while still
skipping functionality that relies on a full implementation, of
course).
This commit is contained in:
Linus Groh 2022-09-21 23:27:13 +01:00
parent 1ace80235b
commit 87654f5b51
9 changed files with 199 additions and 4 deletions
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71
Userland/Libraries/LibWeb/Streams/ReadableStream.cpp Normal file
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/*
* Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/HTML/Window.h>
#include <LibWeb/Streams/AbstractOperations.h>
#include <LibWeb/Streams/ReadableStream.h>
namespace Web::Streams {
// https://streams.spec.whatwg.org/#rs-constructor
DOM::ExceptionOr<JS::NonnullGCPtr<ReadableStream>> ReadableStream::create_with_global_object(HTML::Window& window)
{
auto* readable_stream = window.heap().allocate<ReadableStream>(window.realm(), window);
return JS::NonnullGCPtr { *readable_stream };
}
ReadableStream::ReadableStream(HTML::Window& window)
: PlatformObject(window.realm())
{
set_prototype(&window.cached_web_prototype("ReadableStream"));
}
ReadableStream::~ReadableStream() = default;
void ReadableStream::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_controller);
visitor.visit(m_reader);
visitor.visit(m_stored_error);
}
// https://streams.spec.whatwg.org/#readablestream-locked
bool ReadableStream::is_readable() const
{
// A ReadableStream stream is readable if stream.[[state]] is "readable".
return m_state == State::Readable;
}
// https://streams.spec.whatwg.org/#readablestream-closed
bool ReadableStream::is_closed() const
{
// A ReadableStream stream is closed if stream.[[state]] is "closed".
return m_state == State::Closed;
}
// https://streams.spec.whatwg.org/#readablestream-errored
bool ReadableStream::is_errored() const
{
// A ReadableStream stream is errored if stream.[[state]] is "errored".
return m_state == State::Errored;
}
// https://streams.spec.whatwg.org/#readablestream-locked
bool ReadableStream::is_locked() const
{
// A ReadableStream stream is locked if ! IsReadableStreamLocked(stream) returns true.
return is_readable_stream_locked(*this);
}
// https://streams.spec.whatwg.org/#is-readable-stream-disturbed
bool ReadableStream::is_disturbed() const
{
// A ReadableStream stream is disturbed if stream.[[disturbed]] is true.
return m_disturbed;
}
}