mirror of
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122 lines
4.1 KiB
C++
122 lines
4.1 KiB
C++
/*
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* Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Heap/Heap.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/IteratorOperations.h>
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#include <LibJS/Runtime/PromiseCapability.h>
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#include <LibJS/Runtime/Realm.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/ReadableStreamDefaultReaderPrototype.h>
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#include <LibWeb/Streams/AbstractOperations.h>
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#include <LibWeb/Streams/ReadableStream.h>
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#include <LibWeb/Streams/ReadableStreamDefaultReader.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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#include <LibWeb/WebIDL/Promise.h>
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namespace Web::Streams {
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// https://streams.spec.whatwg.org/#default-reader-constructor
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WebIDL::ExceptionOr<JS::NonnullGCPtr<ReadableStreamDefaultReader>> ReadableStreamDefaultReader::construct_impl(JS::Realm& realm, JS::NonnullGCPtr<ReadableStream> stream)
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{
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auto reader = TRY(realm.heap().allocate<ReadableStreamDefaultReader>(realm, realm));
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// 1. Perform ? SetUpReadableStreamDefaultReader(this, stream);
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TRY(set_up_readable_stream_default_reader(reader, *stream));
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return reader;
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}
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ReadableStreamDefaultReader::ReadableStreamDefaultReader(JS::Realm& realm)
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: Bindings::PlatformObject(realm)
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{
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}
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JS::ThrowCompletionOr<void> ReadableStreamDefaultReader::initialize(JS::Realm& realm)
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{
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MUST_OR_THROW_OOM(Base::initialize(realm));
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set_prototype(&Bindings::ensure_web_prototype<Bindings::ReadableStreamDefaultReaderPrototype>(realm, "ReadableStreamDefaultReader"));
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return {};
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}
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void ReadableStreamDefaultReader::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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ReadableStreamGenericReaderMixin::visit_edges(visitor);
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}
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class DefaultReaderReadRequest : public ReadRequest {
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public:
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DefaultReaderReadRequest(JS::Realm& realm, WebIDL::Promise& promise)
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: m_realm(realm)
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, m_promise(promise)
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{
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}
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virtual void on_chunk(JS::Value chunk) override
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{
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WebIDL::resolve_promise(m_realm, m_promise, JS::create_iterator_result_object(m_realm.vm(), chunk, false));
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}
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virtual void on_close() override
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{
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WebIDL::resolve_promise(m_realm, m_promise, JS::create_iterator_result_object(m_realm.vm(), JS::js_undefined(), true));
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}
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virtual void on_error(JS::Value error) override
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{
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WebIDL::reject_promise(m_realm, m_promise, error);
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}
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private:
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JS::Realm& m_realm;
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WebIDL::Promise& m_promise;
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};
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// https://streams.spec.whatwg.org/#default-reader-read
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WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> ReadableStreamDefaultReader::read()
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{
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auto& realm = this->realm();
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// 1. If this.[[stream]] is undefined, return a promise rejected with a TypeError exception.
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if (!m_stream) {
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auto exception = MUST_OR_THROW_OOM(JS::TypeError::create(realm, "Cannot read from an empty stream"sv));
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auto promise_capability = WebIDL::create_rejected_promise(realm, exception);
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return JS::NonnullGCPtr { verify_cast<JS::Promise>(*promise_capability->promise()) };
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}
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// 2. Let promise be a new promise.
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auto promise_capability = WebIDL::create_promise(realm);
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// 3. Let readRequest be a new read request with the following items:
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// chunk steps, given chunk
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// Resolve promise with «[ "value" → chunk, "done" → false ]».
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// close steps
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// Resolve promise with «[ "value" → undefined, "done" → true ]».
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// error steps, given e
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// Reject promise with e.
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auto read_request = adopt_ref(*new DefaultReaderReadRequest(realm, promise_capability));
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// 4. Perform ! ReadableStreamDefaultReaderRead(this, readRequest).
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TRY(readable_stream_default_reader_read(*this, read_request));
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// 5. Return promise.
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return JS::NonnullGCPtr { verify_cast<JS::Promise>(*promise_capability->promise()) };
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}
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// https://streams.spec.whatwg.org/#default-reader-release-lock
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WebIDL::ExceptionOr<void> ReadableStreamDefaultReader::release_lock()
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{
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// 1. If this.[[stream]] is undefined, return.
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if (!m_stream)
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return {};
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// 2. Perform ! ReadableStreamDefaultReaderRelease(this).
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return readable_stream_default_reader_release(*this);
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}
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}
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