LibWeb/IDB: Add internal Index object

Author: https://github.com/stelar7
Commit: 9321ad04c0
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4178
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/AtkinsSJ

Libraries/LibWeb/IndexedDB/Internal/Index.cpp

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2025, stelar7 <dudedbz@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/IndexedDB/Internal/Index.h>
+#include <LibWeb/IndexedDB/Internal/ObjectStore.h>
+
+namespace Web::IndexedDB {
+
+GC_DEFINE_ALLOCATOR(Index);
+
+Index::~Index() = default;
+
+GC::Ref<Index> Index::create(JS::Realm& realm, GC::Ref<ObjectStore> store, String name, KeyPath const& key_path, bool unique, bool multi_entry)
+{
+    return realm.create<Index>(store, name, key_path, unique, multi_entry);
+}
+
+Index::Index(GC::Ref<ObjectStore> store, String name, KeyPath const& key_path, bool unique, bool multi_entry)
+    : m_object_store(store)
+    , m_name(move(name))
+    , m_unique(unique)
+    , m_multi_entry(multi_entry)
+    , m_key_path(key_path)
+{
+    store->add_index(*this);
+}
+
+void Index::visit_edges(Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_object_store);
+
+    for (auto& record : m_records) {
+        visitor.visit(record.key);
+        visitor.visit(record.value);
+    }
+}
+
+}