better type checking for function args

common/src/test/java/structure/ParserTest.java

@@ -27,9 +27,22 @@ public class ParserTest {
             }
 
             @Override
-            public int getArguments() {
+            public int argNumber() {
                 return 2;
             }
+
+            @Override
+            public Returnable.ReturnType getArgument(int position) {
+                switch(position) {
+                    case 0:
+                        return Returnable.ReturnType.STRING;
+                    case 1:
+                        return Returnable.ReturnType.NUMBER;
+                    default:
+                        return null;
+                }
+            }
+
         });
 
         long l = System.nanoTime();
@@ -71,7 +84,7 @@ public class ParserTest {
 
         @Override
         public Position getPosition() {
-            return null;
+            return position;
         }
 
         @Override

common/src/test/resources/test.tesf

@@ -1,5 +1,5 @@
 test("hello" + 3 + "gdfg", (2 * (3+1) * (2 * (1+1))));
 
 if(true || false) {
-    test("fdsgdf" + 2, 3.4);
+    test("fdsgdf" + 2, 1);
 }