Имплементиран quote навод оператер

eval.c

@@ -14,17 +14,16 @@ object eval(object input)
 	if (TYPE(input) == nilObject || TYPE(input) == numberObject ||
 			TYPE(input) == errorObject)
 	{
-		result = input;
+		result = copyObject(input);
 	}
 	else if (TYPE(input) == symbolObject)
 	{
 		if (symbolExists(SYM(input)))
 		{
-			result = input;
+			result = copyObject(input);
 		}
 		else
 		{
-			deleteObject(input);
 			TYPE(result) = errorObject;
 			ERR(result) = unrecognizedSymbolError;
 		}
@@ -33,34 +32,39 @@ object eval(object input)
 	{
 		if (!properList(input))
 		{
-			deleteObject(input);
 			TYPE(result) = errorObject;
 			ERR(result) = improperListError;
 		}
-
-		object *currentCell = &input;
-		int noErrors = 1;
-		while (TYPE(*currentCell) != nilObject)
+		else
 		{
-			CAR(*currentCell) = eval(CAR(*currentCell));
-
-			if (TYPE(CAR(*currentCell)) == errorObject)
+			object *currentCell = &input;
+			int noErrors = 1;
+			while (TYPE(*currentCell) != nilObject)
 			{
-				noErrors = 0;
-				TYPE(result) = errorObject;
-				ERR(result) = ERR(CAR(*currentCell));
-				break;
-			}
-			currentCell = &CDR(*currentCell);
-		}
+				if (strcmp(SYM(CAR(input)), "навод") != 0)
+				{
+					CAR(*currentCell) =
+						eval(CAR(*currentCell));
+				}
 
-		if (noErrors)
-		{
-			result = apply(CAR(input), CDR(input));
+				if (TYPE(CAR(*currentCell)) == errorObject)
+				{
+					noErrors = 0;
+					TYPE(result) = errorObject;
+					ERR(result) = ERR(CAR(*currentCell));
+					break;
+				}
+				currentCell = &CDR(*currentCell);
+			}
+
+			if (noErrors)
+			{
+				result = apply(CAR(input), CDR(input));
+			}
 		}
-		deleteObject(input);
 	}
 
+	deleteObject(input);
 	return result;
 }
 

init.c

@@ -20,4 +20,5 @@ void init()
 	addSymbolInternal("-", &subtract);
 	addSymbolInternal("*", &multiply);
 	addSymbolInternal("/", &divide);
+	addSymbolInternal("навод", &quote);
 }

internals.c

@@ -135,3 +135,18 @@ object divide(object parameters)
 
 	return result;
 }
+
+object quote(object parameters)
+{
+	object result;
+	if (listLength(parameters) != 1)
+	{
+		TYPE(result) = errorObject;
+		ERR(result) = argumentNumberError;
+	}
+	else
+	{
+		result = copyObject(CAR(parameters));
+	}
+	return result;
+}

internals.h

@@ -4,3 +4,4 @@ object add(object parameters);
 object subtract(object parameters);
 object multiply(object parameters);
 object divide(object parameters);
+object quote(object parameters);