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/CSS/CSSNestedDeclarations.cpp

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "CSSNestedDeclarations.h"
+#include <LibWeb/Bindings/CSSNestedDeclarationsPrototype.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/CSS/CSSStyleRule.h>
+
+namespace Web::CSS {
+
+JS_DEFINE_ALLOCATOR(CSSNestedDeclarations);
+
+JS::NonnullGCPtr<CSSNestedDeclarations> CSSNestedDeclarations::create(JS::Realm& realm, PropertyOwningCSSStyleDeclaration& declaration)
+{
+    return realm.heap().allocate<CSSNestedDeclarations>(realm, realm, declaration);
+}
+
+CSSNestedDeclarations::CSSNestedDeclarations(JS::Realm& realm, PropertyOwningCSSStyleDeclaration& declaration)
+    : CSSRule(realm, Type::NestedDeclarations)
+    , m_declaration(declaration)
+{
+    m_declaration->set_parent_rule(*this);
+}
+
+void CSSNestedDeclarations::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(CSSNestedDeclarations);
+}
+
+void CSSNestedDeclarations::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_declaration);
+    visitor.visit(m_parent_style_rule);
+}
+
+CSSStyleDeclaration* CSSNestedDeclarations::style()
+{
+    return m_declaration;
+}
+
+CSSStyleRule const& CSSNestedDeclarations::parent_style_rule() const
+{
+    if (m_parent_style_rule)
+        return *m_parent_style_rule;
+
+    for (auto* parent = parent_rule(); parent; parent = parent->parent_rule()) {
+        if (is<CSSStyleRule>(parent)) {
+            m_parent_style_rule = static_cast<CSSStyleRule const*>(parent);
+            return *m_parent_style_rule;
+        }
+    }
+
+    dbgln("CSSNestedDeclarations has no parent style rule!");
+    VERIFY_NOT_REACHED();
+}
+
+String CSSNestedDeclarations::serialized() const
+{
+    // NOTE: There's no proper spec for this yet, only this note:
+    // "The CSSNestedDeclarations rule serializes as if its declaration block had been serialized directly."
+    // - https://drafts.csswg.org/css-nesting-1/#ref-for-cssnesteddeclarations%E2%91%A1
+    // So, we'll do the simple thing and hope it's good.
+    return m_declaration->serialized();
+}
+
+void CSSNestedDeclarations::clear_caches()
+{
+    Base::clear_caches();
+    m_parent_style_rule = nullptr;
+}
+
+}