LibWeb/IDB: Implement clear_an_object_store

Author: https://github.com/stelar7
Commit: 637f35c0eb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4650
Reviewed-by: https://github.com/AtkinsSJ ✅

Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp

@@ -1840,4 +1840,19 @@ GC::Ptr<IDBCursor> iterate_a_cursor(JS::Realm& realm, GC::Ref<IDBCursor> cursor,
     return cursor;
 }
 
+// https://w3c.github.io/IndexedDB/#clear-an-object-store
+JS::Value clear_an_object_store(GC::Ref<ObjectStore> store)
+{
+    // 1. Remove all records from store.
+    store->clear_records();
+
+    // 2. In all indexes which reference store, remove all records.
+    for (auto const& [name, index] : store->index_set()) {
+        index->clear_records();
+    }
+
+    // 3. Return undefined.
+    return JS::js_undefined();
+}
+
 }

Libraries/LibWeb/IndexedDB/Internal/Algorithms.h

@@ -45,5 +45,6 @@ WebIDL::ExceptionOr<GC::Ref<IDBKeyRange>> convert_a_value_to_a_key_range(JS::Rea
 JS::Value count_the_records_in_a_range(GC::Ref<ObjectStore>, GC::Ref<IDBKeyRange>);
 WebIDL::ExceptionOr<JS::Value> retrieve_a_value_from_an_object_store(JS::Realm&, GC::Ref<ObjectStore>, GC::Ref<IDBKeyRange>);
 GC::Ptr<IDBCursor> iterate_a_cursor(JS::Realm&, GC::Ref<IDBCursor>, GC::Ptr<Key> = nullptr, GC::Ptr<Key> = nullptr, u64 = 1);
+JS::Value clear_an_object_store(GC::Ref<ObjectStore>);
 
 }

Libraries/LibWeb/IndexedDB/Internal/Index.cpp

@@ -71,4 +71,9 @@ HTML::SerializationRecord Index::referenced_value(IndexRecord const& index_recor
         .value;
 }
 
+void Index::clear_records()
+{
+    m_records.clear();
+}
+
 }

Libraries/LibWeb/IndexedDB/Internal/Index.h

@@ -40,6 +40,7 @@ public:
     [[nodiscard]] KeyPath const& key_path() const { return m_key_path; }
 
     [[nodiscard]] bool has_record_with_key(GC::Ref<Key> key);
+    void clear_records();
 
     HTML::SerializationRecord referenced_value(IndexRecord const& index_record) const;
 

Libraries/LibWeb/IndexedDB/Internal/ObjectStore.cpp

@@ -84,4 +84,9 @@ Optional<Record&> ObjectStore::first_in_range(GC::Ref<IDBKeyRange> range)
     });
 }
 
+void ObjectStore::clear_records()
+{
+    m_records.clear();
+}
+
 }

Libraries/LibWeb/IndexedDB/Internal/ObjectStore.h

@@ -55,6 +55,7 @@ public:
     void store_a_record(Record const& record);
     u64 count_records_in_range(GC::Ref<IDBKeyRange> range);
     Optional<Record&> first_in_range(GC::Ref<IDBKeyRange> range);
+    void clear_records();
 
 protected:
     virtual void visit_edges(Visitor&) override;