From d8d0e8a6ea0a5f87af680c52b951d4cb8bf1674a Mon Sep 17 00:00:00 2001
From: Kenneth Myhra <kennethmyhra@gmail.com>
Date: Fri, 7 Jul 2023 16:06:18 +0200
Subject: [PATCH] LibWeb: Add AO
 transform_stream_default_controller_clear_algorithms()

---
 .../Libraries/LibWeb/Streams/AbstractOperations.cpp | 13 +++++++++++++
 .../Libraries/LibWeb/Streams/AbstractOperations.h   |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp b/Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
index 6d44514027..40f5bb17d6 100644
--- a/Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
+++ b/Userland/Libraries/LibWeb/Streams/AbstractOperations.cpp
@@ -2,6 +2,7 @@
  * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
  * Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
  * Copyright (c) 2023, Shannon Booth <shannon.ml.booth@gmail.com>
+ * Copyright (c) 2023, Kenneth Myhra <kennethmyhra@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -20,6 +21,7 @@
 #include <LibWeb/Streams/ReadableStreamDefaultController.h>
 #include <LibWeb/Streams/ReadableStreamDefaultReader.h>
 #include <LibWeb/Streams/ReadableStreamGenericReader.h>
+#include <LibWeb/Streams/TransformStreamDefaultController.h>
 #include <LibWeb/Streams/UnderlyingSink.h>
 #include <LibWeb/Streams/UnderlyingSource.h>
 #include <LibWeb/Streams/WritableStream.h>
@@ -2720,6 +2722,17 @@ WebIDL::ExceptionOr<void> writable_stream_default_controller_write(WritableStrea
     return {};
 }
 
+// https://streams.spec.whatwg.org/#transform-stream-default-controller-clear-algorithms
+void transform_stream_default_controller_clear_algorithms(TransformStreamDefaultController& controller)
+{
+    // NOTE: This is observable using weak references. See tc39/proposal-weakrefs#31 for more detail.
+    // 1. Set controller.[[transformAlgorithm]] to undefined.
+    controller.set_transform_algorithm({});
+
+    // 2. Set controller.[[flushAlgorithm]] to undefined.
+    controller.set_flush_algorithm({});
+}
+
 // https://streams.spec.whatwg.org/#is-non-negative-number
 bool is_non_negative_number(JS::Value value)
 {
diff --git a/Userland/Libraries/LibWeb/Streams/AbstractOperations.h b/Userland/Libraries/LibWeb/Streams/AbstractOperations.h
index bebeee04b8..2ff9e92f79 100644
--- a/Userland/Libraries/LibWeb/Streams/AbstractOperations.h
+++ b/Userland/Libraries/LibWeb/Streams/AbstractOperations.h
@@ -2,6 +2,7 @@
  * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
  * Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
  * Copyright (c) 2023, Shannon Booth <shannon.ml.booth@gmail.com>
+ * Copyright (c) 2023, Kenneth Myhra <kennethmyhra@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -131,6 +132,8 @@ WebIDL::ExceptionOr<void> writable_stream_default_controller_process_close(Writa
 WebIDL::ExceptionOr<void> writable_stream_default_controller_process_write(WritableStreamDefaultController&, JS::Value chunk);
 WebIDL::ExceptionOr<void> writable_stream_default_controller_write(WritableStreamDefaultController&, JS::Value chunk, JS::Value chunk_size);
 
+void transform_stream_default_controller_clear_algorithms(TransformStreamDefaultController&);
+
 bool is_non_negative_number(JS::Value);
 
 JS::Value create_close_sentinel();