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LibWeb: Implement ReadableByteStreamController.[[CancelSteps]]
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@ -12,6 +12,7 @@
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#include <LibWeb/Streams/AbstractOperations.h>
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#include <LibWeb/Streams/ReadableByteStreamController.h>
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#include <LibWeb/Streams/ReadableStream.h>
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#include <LibWeb/Streams/ReadableStreamBYOBRequest.h>
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#include <LibWeb/Streams/ReadableStreamDefaultController.h>
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#include <LibWeb/Streams/ReadableStreamDefaultReader.h>
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#include <LibWeb/Streams/ReadableStreamGenericReader.h>
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@ -744,6 +745,26 @@ WebIDL::ExceptionOr<void> set_up_readable_stream_default_controller_from_underly
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return set_up_readable_stream_default_controller(stream, controller, move(start_algorithm), move(pull_algorithm), move(cancel_algorithm), high_water_mark, move(size_algorithm));
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}
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// https://streams.spec.whatwg.org/#readable-byte-stream-controller-clear-algorithms
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void readable_byte_stream_controller_clear_algorithms(ReadableByteStreamController& controller)
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{
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// 1. Set controller.[[pullAlgorithm]] to undefined.
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controller.set_pull_algorithm({});
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// 2. Set controller.[[cancelAlgorithm]] to undefined.
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controller.set_cancel_algorithm({});
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}
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// https://streams.spec.whatwg.org/#readable-byte-stream-controller-clear-pending-pull-intos
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void readable_byte_stream_controller_clear_pending_pull_intos(ReadableByteStreamController& controller)
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{
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// 1. Perform ! ReadableByteStreamControllerInvalidateBYOBRequest(controller).
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readable_byte_stream_controller_invalidate_byob_request(controller);
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// 2. Set controller.[[pendingPullIntos]] to a new empty list.
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controller.pending_pull_intos().clear();
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}
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// https://streams.spec.whatwg.org/#readable-byte-stream-controller-get-desired-size
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Optional<double> readable_byte_stream_controller_get_desired_size(ReadableByteStreamController const& controller)
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{
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@ -762,6 +783,23 @@ Optional<double> readable_byte_stream_controller_get_desired_size(ReadableByteSt
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return controller.strategy_hwm() - controller.queue_total_size();
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}
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// https://streams.spec.whatwg.org/#readable-byte-stream-controller-invalidate-byob-request
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void readable_byte_stream_controller_invalidate_byob_request(ReadableByteStreamController& controller)
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{
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// 1. If controller.[[byobRequest]] is null, return.
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if (!controller.byob_request())
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return;
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// 2. Set controller.[[byobRequest]].[[controller]] to undefined.
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controller.byob_request()->set_controller({});
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// 3. Set controller.[[byobRequest]].[[view]] to null.
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controller.byob_request()->set_view({});
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// 4. Set controller.[[byobRequest]] to null.
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controller.set_byob_request({});
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}
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// https://streams.spec.whatwg.org/#acquire-writable-stream-default-writer
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WebIDL::ExceptionOr<JS::NonnullGCPtr<WritableStreamDefaultWriter>> acquire_writable_stream_default_writer(WritableStream& stream)
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{
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@ -53,7 +53,10 @@ bool readable_stream_default_controller_can_close_or_enqueue(ReadableStreamDefau
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WebIDL::ExceptionOr<void> set_up_readable_stream_default_controller(ReadableStream&, ReadableStreamDefaultController&, StartAlgorithm&&, PullAlgorithm&&, CancelAlgorithm&&, double high_water_mark, SizeAlgorithm&&);
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WebIDL::ExceptionOr<void> set_up_readable_stream_default_controller_from_underlying_source(ReadableStream&, JS::Value underlying_source_value, UnderlyingSource, double high_water_mark, SizeAlgorithm&&);
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void readable_byte_stream_controller_clear_algorithms(ReadableByteStreamController&);
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void readable_byte_stream_controller_clear_pending_pull_intos(ReadableByteStreamController&);
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Optional<double> readable_byte_stream_controller_get_desired_size(ReadableByteStreamController const&);
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void readable_byte_stream_controller_invalidate_byob_request(ReadableByteStreamController&);
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WebIDL::ExceptionOr<JS::NonnullGCPtr<WritableStreamDefaultWriter>> acquire_writable_stream_default_writer(WritableStream&);
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bool is_writable_stream_locked(WritableStream const&);
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@ -22,6 +22,25 @@ ReadableByteStreamController::ReadableByteStreamController(JS::Realm& realm)
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{
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}
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// https://streams.spec.whatwg.org/#rbs-controller-private-cancel
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WebIDL::ExceptionOr<JS::GCPtr<WebIDL::Promise>> ReadableByteStreamController::cancel_steps(JS::Value reason)
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{
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// 1. Perform ! ReadableByteStreamControllerClearPendingPullIntos(this).
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readable_byte_stream_controller_clear_pending_pull_intos(*this);
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// 2. Perform ! ResetQueue(this).
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reset_queue(*this);
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// 3. Let result be the result of performing this.[[cancelAlgorithm]], passing in reason.
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auto result = (*m_cancel_algorithm)(reason);
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// 4. Perform ! ReadableByteStreamControllerClearAlgorithms(this).
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readable_byte_stream_controller_clear_algorithms(*this);
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// 5. Return result.
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return result;
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}
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void ReadableByteStreamController::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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@ -116,6 +116,8 @@ public:
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JS::GCPtr<ReadableStream> stream() { return m_stream; }
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void set_stream(JS::GCPtr<ReadableStream> stream) { m_stream = stream; }
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WebIDL::ExceptionOr<JS::GCPtr<WebIDL::Promise>> cancel_steps(JS::Value reason);
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private:
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explicit ReadableByteStreamController(JS::Realm&);
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@ -8,6 +8,8 @@
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#include <LibJS/Runtime/TypedArray.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/Streams/ReadableByteStreamController.h>
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namespace Web::Streams {
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@ -20,6 +22,10 @@ public:
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JS::GCPtr<JS::TypedArrayBase> view();
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void set_controller(JS::GCPtr<ReadableByteStreamController> value) { m_controller = value; }
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void set_view(JS::GCPtr<JS::TypedArrayBase> value) { m_view = value; }
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private:
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explicit ReadableStreamBYOBRequest(JS::Realm&);
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