LibWeb: Implement DOMStringList

Author: https://github.com/jamierocks
Commit: 75216182c9
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/731
Reviewed-by: https://github.com/AtkinsSJ

Userland/Libraries/LibWeb/HTML/DOMStringList.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Vector.h>
+#include <LibWeb/Bindings/PlatformObject.h>
+
+namespace Web::HTML {
+
+class DOMStringList final : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(DOMStringList, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMStringList);
+
+public:
+    static JS::NonnullGCPtr<DOMStringList> create(JS::Realm&, Vector<String>);
+
+    u32 length() const;
+    Optional<String> item(u32 index) const;
+    bool contains(StringView string);
+
+    virtual bool is_supported_property_index(u32) const override;
+    virtual WebIDL::ExceptionOr<JS::Value> item_value(size_t index) const override;
+
+private:
+    explicit DOMStringList(JS::Realm&, Vector<String>);
+
+    virtual void initialize(JS::Realm&) override;
+
+    Vector<String> m_list;
+};
+
+}