refactor objects

internal/vm/vm.go

@@ -102,7 +102,7 @@ func (s *VMState) ExportedHash() *object.Hash {
 			if symbol.Scope == compiler.GlobalScope {
 				obj := s.Globals[symbol.Index]
 				s := object.String{Value: name}
-				pairs[s.HashKey()] = object.HashPair{Key: s, Value: obj}
+				pairs[s.Hash()] = object.HashPair{Key: s, Value: obj}
 			}
 		}
 	}
@@ -210,8 +210,8 @@ func (vm *VM) executeSetGlobal() error {
 	globalIndex := vm.currentFrame().ReadUint16()
 
 	ref := vm.pop()
-	if immutable, ok := ref.(object.Immutable); ok {
-		vm.state.Globals[globalIndex] = immutable.Clone()
+	if obj, ok := ref.(object.Copyable); ok {
+		vm.state.Globals[globalIndex] = obj.Copy()
 	} else {
 		vm.state.Globals[globalIndex] = ref
 	}
@@ -223,8 +223,8 @@ func (vm *VM) executeSetLocal() error {
 	localIndex := vm.currentFrame().ReadUint8()
 
 	ref := vm.pop()
-	if immutable, ok := ref.(object.Immutable); ok {
-		vm.stack[vm.currentFrame().basePointer+int(localIndex)] = immutable.Clone()
+	if obj, ok := ref.(object.Copyable); ok {
+		vm.stack[vm.currentFrame().basePointer+int(localIndex)] = obj.Copy()
 	} else {
 		vm.stack[vm.currentFrame().basePointer+int(localIndex)] = ref
 	}
@@ -241,12 +241,12 @@ func (vm *VM) buildHash(startIndex, endIndex int) (object.Object, error) {
 
 		pair := object.HashPair{Key: key, Value: value}
 
-		hashKey, ok := key.(object.Hashable)
+		hashKey, ok := key.(object.Hasher)
 		if !ok {
 			return nil, fmt.Errorf("unusable as hash key: %s", key.Type())
 		}
 
-		hashedPairs[hashKey.HashKey()] = pair
+		hashedPairs[hashKey.Hash()] = pair
 	}
 
 	return &object.Hash{Pairs: hashedPairs}, nil