Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/SVG/SVGURIReference.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2023, Luke Wilde <lukew@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/SVG/AttributeNames.h>
+#include <LibWeb/SVG/SVGAnimatedString.h>
+
+namespace Web::SVG {
+
+enum class SupportsXLinkHref {
+    No,
+    Yes,
+};
+
+// https://svgwg.org/svg2-draft/types.html#InterfaceSVGURIReference
+template<SupportsXLinkHref supports_xlink_href>
+class SVGURIReferenceMixin {
+public:
+    virtual ~SVGURIReferenceMixin() = default;
+
+    JS::NonnullGCPtr<SVGAnimatedString> href()
+    {
+        // The href IDL attribute represents the value of the ‘href’ attribute, and, on elements that are defined to support
+        // it, the deprecated ‘xlink:href’ attribute. On getting href, an SVGAnimatedString object is returned that:
+        //    - reflects the ‘href’ attribute, and
+        //    - if the element is defined to support the deprecated ‘xlink:href’ attribute, additionally reflects that
+        //      deprecated attribute.
+        if (!m_href_animated_string) {
+            auto* this_svg_element = dynamic_cast<SVGElement*>(this);
+            VERIFY(this_svg_element);
+            m_href_animated_string = SVGAnimatedString::create(this_svg_element->realm(), *this_svg_element, AttributeNames::href, supports_xlink_href == SupportsXLinkHref::Yes ? Optional<FlyString> { AttributeNames::xlink_href } : OptionalNone {});
+        }
+        return *m_href_animated_string;
+    }
+
+protected:
+    void visit_edges(JS::Cell::Visitor& visitor)
+    {
+        visitor.visit(m_href_animated_string);
+    }
+
+private:
+    JS::GCPtr<SVGAnimatedString> m_href_animated_string;
+};
+
+}