LibWeb/CSS: Implement CSSNumericArray

Author: https://github.com/AtkinsSJ
Commit: a46c980629
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5955
Reviewed-by: https://github.com/trflynn89

Libraries/LibWeb/CSS/CSSNumericArray.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2025, Sam Atkins <sam@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "CSSNumericArray.h"
+#include <LibWeb/Bindings/CSSNumericArrayPrototype.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/CSS/CSSNumericValue.h>
+
+namespace Web::CSS {
+
+GC_DEFINE_ALLOCATOR(CSSNumericArray);
+
+GC::Ref<CSSNumericArray> CSSNumericArray::create(JS::Realm& realm, Vector<GC::Ref<CSSNumericValue>> values)
+{
+    return realm.create<CSSNumericArray>(realm, move(values));
+}
+
+CSSNumericArray::CSSNumericArray(JS::Realm& realm, Vector<GC::Ref<CSSNumericValue>> values)
+    : Bindings::PlatformObject(realm)
+    , m_values(move(values))
+{
+    m_legacy_platform_object_flags = LegacyPlatformObjectFlags {
+        .supports_indexed_properties = true,
+    };
+}
+
+CSSNumericArray::~CSSNumericArray() = default;
+
+void CSSNumericArray::initialize(JS::Realm& realm)
+{
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSNumericArray);
+    Base::initialize(realm);
+}
+
+void CSSNumericArray::visit_edges(Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_values);
+}
+
+// https://drafts.css-houdini.org/css-typed-om-1/#dom-cssnumericarray-length
+WebIDL::UnsignedLong CSSNumericArray::length() const
+{
+    // The length attribute of CSSNumericArray indicates how many CSSNumericValues are contained within the CSSNumericArray.
+    return m_values.size();
+}
+
+// https://drafts.css-houdini.org/css-typed-om-1/#cssnumericarray-indexed-property-getter
+Optional<JS::Value> CSSNumericArray::item_value(size_t index) const
+{
+    // The indexed property getter of CSSNumericArray retrieves the CSSNumericValue at the provided index.
+    if (auto item = m_values.get(index); item.has_value())
+        return item.release_value();
+    return {};
+}
+
+}