refactor objects

internal/evaluator/evaluator.go

@@ -61,8 +61,8 @@ func Eval(node ast.Node, env *object.Environment) object.Object {
 		}
 
 		if ident, ok := node.Left.(*ast.Identifier); ok {
-			if immutable, ok := value.(object.Immutable); ok {
-				env.Set(ident.Value, immutable.Clone())
+			if obj, ok := value.(object.Copyable); ok {
+				env.Set(ident.Value, obj.Copy())
 			} else {
 				env.Set(ident.Value, value)
 			}
@@ -105,8 +105,8 @@ func Eval(node ast.Node, env *object.Environment) object.Object {
 				if isError(key) {
 					return key
 				}
-				if hashKey, ok := key.(object.Hashable); ok {
-					hashed := hashKey.HashKey()
+				if hashKey, ok := key.(object.Hasher); ok {
+					hashed := hashKey.Hash()
 					hash.Pairs[hashed] = object.HashPair{Key: key, Value: value}
 				} else {
 					return newError("cannot index hash with %T", key)
@@ -630,12 +630,12 @@ func evalStringIndexExpression(str, index object.Object) object.Object {
 func evalHashIndexExpression(hash, index object.Object) object.Object {
 	hashObject := hash.(*object.Hash)
 
-	key, ok := index.(object.Hashable)
+	key, ok := index.(object.Hasher)
 	if !ok {
 		return newError("unusable as hash key: %s", index.Type())
 	}
 
-	pair, ok := hashObject.Pairs[key.HashKey()]
+	pair, ok := hashObject.Pairs[key.Hash()]
 	if !ok {
 		return NULL
 	}
@@ -664,7 +664,7 @@ func evalHashLiteral(node *ast.HashLiteral, env *object.Environment) object.Obje
 			return key
 		}
 
-		hashKey, ok := key.(object.Hashable)
+		hashKey, ok := key.(object.Hasher)
 		if !ok {
 			return newError("unusable as hash key: %s", key.Type())
 		}
@@ -674,7 +674,7 @@ func evalHashLiteral(node *ast.HashLiteral, env *object.Environment) object.Obje
 			return value
 		}
 
-		hashed := hashKey.HashKey()
+		hashed := hashKey.Hash()
 		pairs[hashed] = object.HashPair{
 			Key:   key,
 			Value: value,