mirror of
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100 lines
4.3 KiB
C++
100 lines
4.3 KiB
C++
/*
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* Copyright (c) 2023, Kenneth Myhra <kennethmyhra@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 <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Streams/AbstractOperations.h>
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#include <LibWeb/Streams/TransformStream.h>
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#include <LibWeb/Streams/TransformStreamDefaultController.h>
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#include <LibWeb/Streams/Transformer.h>
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#include <LibWeb/Streams/WritableStream.h>
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#include <LibWeb/WebIDL/AbstractOperations.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::Streams {
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// https://streams.spec.whatwg.org/#ts-construct
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WebIDL::ExceptionOr<JS::NonnullGCPtr<TransformStream>> TransformStream::construct_impl(JS::Realm& realm, Optional<JS::Handle<JS::Object>> transformer_object, QueuingStrategy const& writable_strategy, QueuingStrategy const& readable_strategy)
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{
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auto& vm = realm.vm();
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auto stream = MUST_OR_THROW_OOM(realm.heap().allocate<TransformStream>(realm, realm));
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// 1. If transformer is missing, set it to null.
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auto transformer = transformer_object.has_value() ? JS::Value { transformer_object.value().ptr() } : JS::js_null();
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// 2. Let transformerDict be transformer, converted to an IDL value of type Transformer.
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auto transformer_dict = TRY(Transformer::from_value(vm, transformer));
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// 3. If transformerDict["readableType"] exists, throw a RangeError exception.
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if (transformer_dict.readable_type.has_value())
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Invalid use of reserved key 'readableType'"sv };
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// 4. If transformerDict["writableType"] exists, throw a RangeError exception.
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if (transformer_dict.writable_type.has_value())
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return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Invalid use of reserved key 'writableType'"sv };
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// 5. Let readableHighWaterMark be ? ExtractHighWaterMark(readableStrategy, 0).
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auto readable_high_water_mark = TRY(extract_high_water_mark(readable_strategy, 0));
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// 6. Let readableSizeAlgorithm be ! ExtractSizeAlgorithm(readableStrategy).
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auto readable_size_algorithm = extract_size_algorithm(readable_strategy);
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// 7. Let writableHighWaterMark be ? ExtractHighWaterMark(writableStrategy, 1).
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auto writable_high_water_mark = TRY(extract_high_water_mark(writable_strategy, 1));
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// 8. Let writableSizeAlgorithm be ! ExtractSizeAlgorithm(writableStrategy).
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auto writable_size_algorithm = extract_size_algorithm(writable_strategy);
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// 9. Let startPromise be a new promise.
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auto start_promise = WebIDL::create_promise(realm);
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// 10. Perform ! InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm,
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// readableHighWaterMark, readableSizeAlgorithm).
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TRY(initialize_transform_stream(*stream, start_promise, writable_high_water_mark, move(writable_size_algorithm), readable_high_water_mark, move(readable_size_algorithm)));
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// 11. Perform ? SetUpTransformStreamDefaultControllerFromTransformer(this, transformer, transformerDict).
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TRY(set_up_transform_stream_default_controller_from_transformer(*stream, transformer, transformer_dict));
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// 12. If transformerDict["start"] exists, then resolve startPromise with the result of invoking
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// transformerDict["start"] with argument list « this.[[controller]] » and callback this value transformer.
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if (transformer_dict.start) {
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auto result = MUST_OR_THROW_OOM(WebIDL::invoke_callback(*transformer_dict.start, transformer, stream->controller())).release_value();
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WebIDL::resolve_promise(realm, start_promise, result);
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}
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// 13. Otherwise, resolve startPromise with undefined.
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else {
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WebIDL::resolve_promise(realm, start_promise, JS::js_undefined());
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}
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return stream;
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}
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TransformStream::TransformStream(JS::Realm& realm)
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: Bindings::PlatformObject(realm)
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{
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}
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TransformStream::~TransformStream() = default;
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JS::ThrowCompletionOr<void> TransformStream::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::TransformStreamPrototype>(realm, "TransformStream"));
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return {};
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}
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void TransformStream::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_backpressure_change_promise);
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visitor.visit(m_controller);
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visitor.visit(m_readable);
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visitor.visit(m_writable);
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}
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}
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