From 1a5bf15b4da25e4b9362519439ed1bc2b021bc24 Mon Sep 17 00:00:00 2001
From: Luke Wilde <lukew@serenityos.org>
Date: Fri, 10 Dec 2021 19:48:51 +0000
Subject: LibWeb: Implement AbortSignal.throwIfAborted

See: https://github.com/whatwg/dom/commit/cfe2f1e
---
 Userland/Libraries/LibWeb/DOM/AbortSignal.cpp | 16 ++++++++++++++++
 Userland/Libraries/LibWeb/DOM/AbortSignal.h   |  2 ++
 Userland/Libraries/LibWeb/DOM/AbortSignal.idl |  1 +
 3 files changed, 19 insertions(+)

(limited to 'Userland/Libraries')

diff --git a/Userland/Libraries/LibWeb/DOM/AbortSignal.cpp b/Userland/Libraries/LibWeb/DOM/AbortSignal.cpp
index f86bd74c57..1cb2e23cc7 100644
--- a/Userland/Libraries/LibWeb/DOM/AbortSignal.cpp
+++ b/Userland/Libraries/LibWeb/DOM/AbortSignal.cpp
@@ -73,6 +73,22 @@ HTML::EventHandler AbortSignal::onabort()
     return event_handler_attribute(HTML::EventNames::abort);
 }
 
+// https://dom.spec.whatwg.org/#dom-abortsignal-throwifaborted
+JS::ThrowCompletionOr<void> AbortSignal::throw_if_aborted() const
+{
+    auto& global_object = wrapper()->global_object();
+    auto& vm = global_object.vm();
+
+    // The throwIfAborted() method steps are to throw this’s abort reason, if this is aborted.
+    if (!aborted())
+        return {};
+
+    // FIXME: Remove this once VM::exception() has been removed.
+    vm.throw_exception(global_object, m_abort_reason);
+
+    return JS::throw_completion(m_abort_reason);
+}
+
 void AbortSignal::visit_edges(JS::Cell::Visitor& visitor)
 {
     visitor.visit(m_abort_reason);
diff --git a/Userland/Libraries/LibWeb/DOM/AbortSignal.h b/Userland/Libraries/LibWeb/DOM/AbortSignal.h
index fbbb83bb5c..300c7758bd 100644
--- a/Userland/Libraries/LibWeb/DOM/AbortSignal.h
+++ b/Userland/Libraries/LibWeb/DOM/AbortSignal.h
@@ -53,6 +53,8 @@ public:
     // https://dom.spec.whatwg.org/#dom-abortsignal-reason
     JS::Value reason() const { return m_abort_reason; }
 
+    JS::ThrowCompletionOr<void> throw_if_aborted() const;
+
     void visit_edges(JS::Cell::Visitor&);
 
     // ^EventTarget
diff --git a/Userland/Libraries/LibWeb/DOM/AbortSignal.idl b/Userland/Libraries/LibWeb/DOM/AbortSignal.idl
index d28ef8a5d5..902626de92 100644
--- a/Userland/Libraries/LibWeb/DOM/AbortSignal.idl
+++ b/Userland/Libraries/LibWeb/DOM/AbortSignal.idl
@@ -4,6 +4,7 @@ interface AbortSignal : EventTarget {
 
     readonly attribute boolean aborted;
     readonly attribute any reason;
+    undefined throwIfAborted();
 
     attribute EventHandler onabort;
 };
-- 
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