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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.h Normal file
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/*
* Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
#include <LibJS/Forward.h>
#include <LibWeb/Bindings/PlatformObject.h>
#include <LibWeb/Forward.h>
namespace Web::Streams {
// https://streams.spec.whatwg.org/#readablestream
class ReadableStream final : public Bindings::PlatformObject {
WEB_PLATFORM_OBJECT(Request, Bindings::PlatformObject);
public:
enum class State {
Readable,
Closed,
Errored,
};
static DOM::ExceptionOr<JS::NonnullGCPtr<ReadableStream>> create_with_global_object(HTML::Window&);
virtual ~ReadableStream() override;
JS::GCPtr<JS::Object> controller() const { return m_controller; }
JS::GCPtr<JS::Object> reader() const { return m_reader; }
JS::Value stored_error() const { return m_stored_error; }
bool is_readable() const;
bool is_closed() const;
bool is_errored() const;
bool is_locked() const;
bool is_disturbed() const;
private:
explicit ReadableStream(HTML::Window&);
virtual void visit_edges(Cell::Visitor&) override;
// https://streams.spec.whatwg.org/#readablestream-controller
// A ReadableStreamDefaultController or ReadableByteStreamController created with the ability to control the state and queue of this stream
JS::GCPtr<JS::Object> m_controller;
// https://streams.spec.whatwg.org/#readablestream-detached
// A boolean flag set to true when the stream is transferred
bool m_detached { false };
// https://streams.spec.whatwg.org/#readablestream-disturbed
// A boolean flag set to true when the stream has been read from or canceled
bool m_disturbed { false };
// https://streams.spec.whatwg.org/#readablestream-reader
// A ReadableStreamDefaultReader or ReadableStreamBYOBReader instance, if the stream is locked to a reader, or undefined if it is not
JS::GCPtr<JS::Object> m_reader;
// https://streams.spec.whatwg.org/#readablestream-state
// A string containing the stream’s current state, used internally; one of "readable", "closed", or "errored"
State m_state { State::Readable };
// https://streams.spec.whatwg.org/#readablestream-storederror
// A value indicating how the stream failed, to be given as a failure reason or exception when trying to operate on an errored stream
JS::Value m_stored_error { JS::js_undefined() };
};
}