Changed truthiness

source/interpreter.c

@@ -137,7 +137,7 @@ static bool execAssert(Interpreter* interpreter) {
 		return false;
 	}
 
-	if (!IS_TRUTHY(lhs)) {
+	if (IS_NULL(lhs) || !IS_TRUTHY(lhs)) {
 		(*interpreter->assertOutput)(AS_STRING(rhs));
 		return false;
 	}
@@ -396,6 +396,11 @@ static bool execValCast(Interpreter* interpreter) {
 
 	Literal result = TO_NULL_LITERAL;
 
+	if (IS_NULL(value)) {
+		printf("Can't cast a null value\n");
+		return false;
+	}
+
 	//cast the rhs to the type represented by lhs
 	switch(AS_TYPE(type).typeOf) {
 		case LITERAL_BOOLEAN:
@@ -599,6 +604,11 @@ static bool execFalseJump(Interpreter* interpreter) {
 		return false;
 	}
 
+	if (IS_NULL(lit)) {
+		printf("Null detected in comparison\n");
+		return false;
+	}
+
 	if (!IS_TRUTHY(lit)) {
 		interpreter->count = target + interpreter->codeStart;
 	}

source/literal.c

@@ -323,6 +323,7 @@ void freeLiteral(Literal literal) {
 
 bool _isTruthy(Literal x) {
 	if (IS_NULL(x)) {
+		fprintf(stderr, "Null is neither true nor false");
 		return false;
 	}
 
@@ -330,16 +331,6 @@ bool _isTruthy(Literal x) {
 		return AS_BOOLEAN(x);
 	}
 
-	if (IS_INTEGER(x)) {
-		return AS_INTEGER(x) != 0;
-	}
-
-	if (IS_FLOAT(x)) {
-		return AS_FLOAT(x) != 0;
-	}
-
-	//TODO: empty string as falsy?
-
 	return true;
 }