split get_or_create_class_function into two parts in case you want to get multiple functions from the same class

src/runner/instance.rs

@@ -257,7 +257,10 @@ impl mlua::UserData for Instance{
 						descriptor:Some(class),
 					};
 					iter.find_map(|class|
-						cf.get_or_create_class_function(lua,&class.name,index_str).transpose()
+						cf.get_or_create_class_methods(&class.name)
+							.and_then(|mut class_methods|
+								class_methods.get_or_create_function(lua,index_str).transpose()
+							)
 					).transpose()
 				})?{
 					return function.into_lua(lua);
@@ -378,20 +381,33 @@ struct ClassFunctions{
 	>
 }
 impl ClassFunctions{
-	/// return self.classes[class][index] or create the function in the hashmap and then return it
-	fn get_or_create_class_function(&mut self,lua:&mlua::Lua,class:&str,index:&str)->mlua::Result<Option<mlua::Function>>{
+	/// return self.classes[class] or create the ClassMethods and then return it
+	fn get_or_create_class_methods(&mut self,class:&str)->Option<ClassMethods>{
 		// Use get_entry to get the &'static str keys of the database
 		// and use it as a key for the classes hashmap
-		if let Some((&static_class_str,class_functions))=CLASS_FUNCTION_DATABASE.get_entry(class){
-			if let Some((&static_index_str,function_pointer))=class_functions.get_entry(index){
-				return Ok(Some(
-					self.classes.entry(static_class_str)
-					.or_insert_with(||HashMap::new())
-					.entry(static_index_str)
-					.or_insert(lua.create_function(function_pointer)?)
-					.clone()
-				))
-			}
+		CLASS_FUNCTION_DATABASE.get_entry(class)
+			.map(|(&static_class_str,method_pointers)|
+				ClassMethods{
+					method_pointers,
+					methods:self.classes.entry(static_class_str)
+					.or_insert_with(||HashMap::new()),
+				}
+			)
+	}
+}
+struct ClassMethods<'a>{
+	method_pointers:&'static phf::Map<&'static str,ClassFunctionPointer>,
+	methods:&'a mut HashMap<&'static str,mlua::Function>,
+}
+impl ClassMethods<'_>{
+	/// return self.methods[index] or create the function in the hashmap and then return it
+	fn get_or_create_function(&mut self,lua:&mlua::Lua,index:&str)->mlua::Result<Option<mlua::Function>>{
+		if let Some((&static_index_str,function_pointer))=self.method_pointers.get_entry(index){
+			return Ok(Some(
+				self.methods.entry(static_index_str)
+				.or_insert(lua.create_function(function_pointer)?)
+				.clone()
+			))
 		}
 		return Ok(None)
 	}