Some small changes for SemanticAnalyzer

src/main/java/ast/type/type/TypeEnum.java

@@ -4,5 +4,6 @@ public enum TypeEnum {
     VOID,
     INT,
     CHAR,
-    BOOL
+    BOOL,
+    NULL
 }

src/main/java/semantic/SemanticAnalyzer.java

@@ -254,6 +254,11 @@ public class SemanticAnalyzer implements SemanticVisitor {
                 return new TypeCheckResult(true, type);
             } else if (currentScope.getLocalVar(toCheck.identifier) != null) {
                 var type = currentScope.getLocalVar(toCheck.identifier);
+                MemberAccessNode memberAccessNode = new MemberAccessNode(false);
+                memberAccessNode.identifiers.add(currentClass.identifier);
+                memberAccessNode.identifiers.add(toCheck.identifier);
+                toCheck.memberAccess = memberAccessNode;
+                toCheck.setTypeNode(type);
                 return new TypeCheckResult(true, type);
             }
         }
@@ -328,7 +333,16 @@ public class SemanticAnalyzer implements SemanticVisitor {
         if (toCheck.target != null) {
             if(toCheck.target.memberAccess == null){
                 MemberAccessNode memberAccessNode = new MemberAccessNode(false);
-                memberAccessNode.identifiers.add(currentClass.identifier);
+                var identifierType = currentFields.get(toCheck.target.identifier);
+                if(identifierType == null){
+                    identifierType = currentScope.getLocalVar(toCheck.target.identifier);
+                }
+                if(identifierType instanceof ReferenceType referenceType){
+                    memberAccessNode.identifiers.add(referenceType.getIdentifier());
+                } else {
+                    memberAccessNode.identifiers.add(currentClass.identifier);
+
+                }
                 memberAccessNode.identifiers.add(toCheck.target.identifier);
                 toCheck.target.memberAccess = memberAccessNode;
             }
@@ -688,6 +702,9 @@ public class SemanticAnalyzer implements SemanticVisitor {
             case BOOLEAN_VALUE -> {
                 return new TypeCheckResult(true, new BaseType(TypeEnum.BOOL));
             }
+            case NULL_VALUE -> {
+                return new TypeCheckResult(true, currentNullType);
+            }
             default -> {
                 return new TypeCheckResult(false, null);
             }

src/test/resources/input/typedAstFeatureTests/CorrectTest.java

@@ -1,8 +1,14 @@
-public class If {
-    public If() {
-        int intValue = 5;
-        if(intValue == 5) {
-            intValue--;
-        }
+public class Class1 {
+    public int test(){
+        Class2 class2 = new Class2();
+        int a = class2.test();
+        return a;
+    }
+}
+
+public class Class2
+{
+    public int test(){
+        return 6+2*2;
     }
 }