continued typecheck

src/main/java/Input.java

@@ -7,7 +7,9 @@ class Example {
 class Example2 {
     boolean instVarBool;
     int m(int n){
-        if(instVarBool){
+        boolean localBool;
+        localBool = true;
+        if(localBool){
             return n;
         }
         return -1;

src/main/java/abstractSyntaxTree/Expression/IntConstantExpression.java

@@ -1,6 +1,12 @@
 package abstractSyntaxTree.Expression;
 
 import TypeCheck.AbstractType;
+import TypeCheck.TypeCheckResult;
+import abstractSyntaxTree.Parameter.ParameterList;
+import org.objectweb.asm.MethodVisitor;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
 
 public class IntConstantExpression extends AbstractType implements IExpression{
     public int value;
@@ -8,4 +14,14 @@ public class IntConstantExpression extends AbstractType implements IExpression{
     public IntConstantExpression(int value) {
         this.value = value;
     }
+
+    @Override
+    public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
+        return null;
+    }
+
+    @Override
+    public void codeGen(MethodVisitor mv, LinkedHashMap<String, String> localVars, HashMap<String, HashMap<String, String>> typeContext) throws Exception {
+
+    }
 }

src/main/java/abstractSyntaxTree/Expression/LocalVarIdentifier.java

@@ -24,7 +24,13 @@ public class LocalVarIdentifier implements IExpression{
 
     @Override
     public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
-        return null;
+       TypeCheckResult result = new TypeCheckResult();
+        if (localVars.containsKey(identifier)) {
+            result.type = localVars.get(identifier);
+        } else {
+            throw new Exception("TypeCheck Exception: local var does not exist");
+        }
+        return result;
     }
 
     @Override

src/main/java/abstractSyntaxTree/Statement/BlockStatement.java

@@ -34,6 +34,8 @@ public class BlockStatement extends AbstractType implements IStatement {
         }
 
         for (IStatement statement : statements) {
+            // todo remove later if there are no null statement any more
+            if (statement != null) {
                 TypeCheckResult typeOfCurrentStatement = statement.typeCheck(methodContext, typeContext, localVars);
 
                 if (typeOfCurrentStatement.type.contains(",")) {
@@ -65,6 +67,7 @@ public class BlockStatement extends AbstractType implements IStatement {
                         throw new Exception("TypeCheck Exception: Block returns the wrong type.");
                 }
             }
+        }
         result.type = this.returnType;
         // todo check if the block returns the needed return type in every case
         // todo ignore unreachable statements?