Added Interface

src/main/java/Main.java

@@ -1,7 +1,7 @@
-import oldAst.ASTNode;
+import ast.ASTNode;
 import org.antlr.v4.runtime.*;
-import oldAst.ProgramNode;
+import ast.ProgramNode;
-import bytecode.ByteCodeGenerator;
+//import bytecode.ByteCodeGenerator;
 import org.antlr.v4.runtime.CharStream;
 import org.antlr.v4.runtime.CharStreams;
 import org.antlr.v4.runtime.tree.ParseTree;
@@ -9,7 +9,7 @@ import org.antlr.v4.runtime.CommonTokenStream;
 import parser.astBuilder.ASTBuilder;
 import parser.generated.SimpleJavaLexer;
 import parser.generated.SimpleJavaParser;
-import semantic.SemanticAnalyzer;
+//import semantic.SemanticAnalyzer;
 
 import java.io.IOException;
 import java.nio.file.Paths;
@@ -60,7 +60,7 @@ public class Main {
         /* ------------------------- AST builder -> AST ------------------------- */
         ASTBuilder astBuilder = new ASTBuilder();
         ProgramNode abstractSyntaxTree = (ProgramNode) astBuilder.visit(parseTree);
-
+        System.out.println(abstractSyntaxTree);
         // Printing the AST
 //        System.out.println("-------------------- AST builder -> AST --------------------");
 //        // System.out.println("AST: " + ast.toString());
@@ -70,8 +70,8 @@ public class Main {
         /*
          * ------------------------- Semantic Analyzer -> Tast -------------------------
          */
-        SemanticAnalyzer semanticAnalyzer = new SemanticAnalyzer();
+        //SemanticAnalyzer semanticAnalyzer = new SemanticAnalyzer();
-        ProgramNode typedAst = (ProgramNode) semanticAnalyzer.generateTast(abstractSyntaxTree);
+        //ProgramNode typedAst = (ProgramNode) semanticAnalyzer.generateTast(abstractSyntaxTree);
 
         // Printing the Tast
         System.out.println("Tast generated");
@@ -80,9 +80,9 @@ public class Main {
          * ------------------------- Bytecode Generator -> Bytecode
          * -------------------------
          */
-        ByteCodeGenerator byteCodeGenerator = new ByteCodeGenerator();
+        //ByteCodeGenerator byteCodeGenerator = new ByteCodeGenerator();
         //byteCodeGenerator.generateByteCode(abstractSyntaxTree);
-        byteCodeGenerator.visit(typedAst);
+        //byteCodeGenerator.visit(typedAst);
         System.out.println("Bytecode generated");
 
     }

src/main/java/ast/ClassNode.java

@@ -1,19 +1,14 @@
 package ast;
 
 import ast.type.AccessModifierNode;
-import ast.type.EnumAccessModifierNode;
-import bytecode.visitor.ClassVisitor;
 import ast.member.ConstructorNode;
 import ast.member.MemberNode;
 import ast.member.MethodNode;
-import semantic.SemanticVisitor;
-import typechecker.TypeCheckResult;
-import visitor.Visitable;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class ClassNode implements ASTNode, Visitable {
+public class ClassNode implements ASTNode {
     public AccessModifierNode accessType;
     public String identifier;
     public List<MemberNode> members = new ArrayList<>();
@@ -50,14 +45,4 @@ public class ClassNode implements ASTNode, Visitable {
         }
         return methods;
     }
-
-    @Override
-    public TypeCheckResult accept(SemanticVisitor visitor) {
-        return visitor.analyze(this);
-    }
-
-    @Override
-    public void accept(ClassVisitor classVisitor) {
-        classVisitor.visit(this);
-    }
 }

src/main/java/ast/ProgramNode.java

@@ -1,27 +1,13 @@
 package ast;
 
-import bytecode.visitor.ProgramVisitor;
-import semantic.SemanticVisitor;
-import typechecker.TypeCheckResult;
-import visitor.Visitable;
-
 import java.util.ArrayList;
 import java.util.List;
 
-public class ProgramNode implements ASTNode, Visitable {
+public class ProgramNode implements ASTNode {
     public List<ClassNode> classes = new ArrayList<>();
 
     public void addClass(ClassNode classNode) {
         classes.add(classNode);
     }
 
-    @Override
-    public TypeCheckResult accept(SemanticVisitor visitor) {
-        return visitor.analyze(this);
-    }
-
-    @Override
-    public void accept(ProgramVisitor programVisitor) {
-        programVisitor.visit(this);
-    }
 }

src/main/java/ast/block/BlockNode.java

@@ -1,17 +1,17 @@
 package ast.block;
 
 import ast.ASTNode;
-import ast.statement.StatementNode;
+import ast.statement.IStatementNode;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public class BlockNode implements ASTNode {
-    public List<StatementNode> statements = new ArrayList<>();
+    public List<IStatementNode> statements = new ArrayList<>();
 
     public BlockNode() {}
 
-    public void addStatement(StatementNode statement) {
+    public void addStatement(IStatementNode statement) {
         statements.add(statement);
     }
 }

src/main/java/ast/expression/ExpressionNode.java

@@ -1,4 +0,0 @@
-package ast.expression;
-
-public class ExpressionNode {
-}

src/main/java/ast/expression/IExpressionNode.java

@@ -0,0 +1,5 @@
+package ast.expression;
+
+import ast.ASTNode;
+
+public interface IExpressionNode extends ASTNode {}

src/main/java/ast/expression/binaryexpression/BinaryExpression.java

@@ -1,4 +0,0 @@
-package ast.expression.binaryexpression;
-
-public class BinaryExpression {
-}

src/main/java/ast/expression/binaryexpression/BinaryExpressionNode.java

@@ -0,0 +1,7 @@
+package ast.expression.binaryexpression;
+
+import ast.expression.IExpressionNode;
+
+import java.beans.Expression;
+
+public class BinaryExpressionNode implements IExpressionNode {}

src/main/java/ast/expression/binaryexpression/CalculationExpressionNode.java

@@ -2,7 +2,7 @@ package ast.expression.binaryexpression;
 
 import ast.ASTNode;
 
-public class CalculationExpressionNode implements ASTNode {
+public class CalculationExpressionNode extends BinaryExpressionNode {
     public CalculationExpressionNode calculationExpression;
     public String operator;
     public DotExpressionNode dotExpression;

src/main/java/ast/expression/binaryexpression/DotExpressionNode.java

@@ -2,7 +2,7 @@ package ast.expression.binaryexpression;
 
 import ast.ASTNode;
 
-public class DotExpressionNode implements ASTNode {
+public class DotExpressionNode extends BinaryExpressionNode {
     public DotExpressionNode dotExpression;
     public String operator;
     public DotSubstractionExpressionNode dotSubstractionExpression;

src/main/java/ast/expression/binaryexpression/DotSubstractionExpressionNode.java

@@ -5,7 +5,7 @@ import ast.expression.unaryexpression.MemberAccessNode;
 import ast.statement.statementexpression.methodcallstatementnexpression.MethodCallStatementExpressionNode;
 import ast.type.ValueNode;
 
-public class DotSubstractionExpressionNode implements ASTNode {
+public class DotSubstractionExpressionNode extends BinaryExpressionNode {
     public ValueNode value;
     public String identifier;
     public MemberAccessNode memberAccess;

src/main/java/ast/expression/binaryexpression/NonCalculationExpressionNode.java

@@ -1,15 +1,15 @@
 package ast.expression.binaryexpression;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
 import ast.expression.unaryexpression.UnaryExpressionNode;
 
-public class NonCalculationExpressionNode implements ASTNode {
+public class NonCalculationExpressionNode extends BinaryExpressionNode {
     public UnaryExpressionNode unaryExpression;
     public String operator;
-    public ExpressionNode expression;
+    public IExpressionNode expression;
 
-    public NonCalculationExpressionNode(UnaryExpressionNode unaryExpression, String operator, ExpressionNode expression) {
+    public NonCalculationExpressionNode(UnaryExpressionNode unaryExpression, String operator, IExpressionNode expression) {
         this.unaryExpression = unaryExpression;
         this.operator = operator;
         this.expression = expression;

src/main/java/ast/expression/unaryexpression/NotExpressionNode.java

@@ -1,12 +1,12 @@
 package ast.expression.unaryexpression;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
 
 public class NotExpressionNode implements ASTNode {
-    public ExpressionNode expression;
+    public IExpressionNode expression;
 
-    public NotExpressionNode(ExpressionNode expression) {
+    public NotExpressionNode(IExpressionNode expression) {
         this.expression = expression;
     }
 }

src/main/java/ast/expression/unaryexpression/UnaryExpressionNode.java

@@ -1,20 +1,19 @@
 package ast.expression.unaryexpression;
 
-import ast.ASTNode;
+import ast.expression.IExpressionNode;
-import ast.expression.ExpressionNode;
+import ast.statement.IStatementNode;
-import ast.statement.StatementNode;
 import ast.type.ValueNode;
 
 import java.util.Objects;
 
-public class UnaryExpressionNode implements ASTNode {
+public class UnaryExpressionNode implements IExpressionNode {
     public String thisExp;
     public String identifier;
     public MemberAccessNode memberAccess;
     public ValueNode value;
     public NotExpressionNode notExpression;
-    public StatementNode statement;
+    public IStatementNode statement;
-    public ExpressionNode expression;
+    public IExpressionNode expression;
 
     public UnaryExpressionNode(String value) {
         if(Objects.equals(value, "this")) {
@@ -36,11 +35,11 @@ public class UnaryExpressionNode implements ASTNode {
         this.notExpression = notExpression;
     }
 
-    public UnaryExpressionNode(StatementNode statement) {
+    public UnaryExpressionNode(IStatementNode statement) {
         this.statement = statement;
     }
 
-    public UnaryExpressionNode(ExpressionNode expression) {
+    public UnaryExpressionNode(IExpressionNode expression) {
         this.expression = expression;
     }
 }

src/main/java/ast/member/ConstructorNode.java

@@ -3,8 +3,6 @@ package ast.member;
 import ast.block.BlockNode;
 import ast.parameter.ParameterNode;
 import ast.type.AccessModifierNode;
-import bytecode.visitor.MethodVisitor;
-import visitor.Visitable;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -20,8 +18,8 @@ public class ConstructorNode extends MethodNode {
         this.identifier = identifier;
     }
 
-    public ConstructorNode(AccessModifierNode accessType, String identifier, BlockNode body) {
+    public ConstructorNode(String accessType, String identifier, BlockNode body) {
-        this.accessType = accessType;
+        this.accessType = new AccessModifierNode(accessType);
         this.identifier = identifier;
         this.body = body;
     }
@@ -30,10 +28,4 @@ public class ConstructorNode extends MethodNode {
         parameters.add(parameterNode);
     }
 
-    /*
-    @Override
-    public void accept(MethodVisitor methodVisitor) {
-        methodVisitor.visit(this);
-    }
-    */
 }

src/main/java/ast/member/FieldNode.java

@@ -2,12 +2,8 @@ package ast.member;
 
 import ast.type.AccessModifierNode;
 import ast.type.TypeNode;
-import bytecode.visitor.ClassVisitor;
-import semantic.SemanticVisitor;
-import typechecker.TypeCheckResult;
-import visitor.Visitable;
 
-public class FieldNode implements MemberNode, Visitable {
+public class FieldNode implements MemberNode {
     public AccessModifierNode accessTypeNode;
     public TypeNode type;
     public String identifier;
@@ -17,14 +13,4 @@ public class FieldNode implements MemberNode, Visitable {
         this.type = type;
         this.identifier = name;
     }
-
-    @Override
-    public TypeCheckResult accept(SemanticVisitor visitor) {
-        return visitor.analyze(this);
-    }
-
-    @Override
-    public void accept(ClassVisitor classVisitor) {
-        classVisitor.visit(this);
-    }
 }

src/main/java/ast/member/MethodNode.java

@@ -4,10 +4,6 @@ import ast.block.BlockNode;
 import ast.parameter.ParameterNode;
 import ast.type.AccessModifierNode;
 import ast.type.TypeNode;
-import bytecode.visitor.MethodVisitor;
-import semantic.SemanticVisitor;
-import typechecker.TypeCheckResult;
-import visitor.Visitable;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -17,7 +13,7 @@ public class MethodNode implements MemberNode {
     public TypeNode type;
     public Boolean voidType;
     public String identifier;
-    public List<ParameterNode> parameters;
+    public List<ParameterNode> parameters = new ArrayList<>();
     public BlockNode block;
 
     public MethodNode() {}
@@ -26,9 +22,9 @@ public class MethodNode implements MemberNode {
         this.block = block;
     }
 
-    public MethodNode(AccessModifierNode accessModifier, TypeNode type, Boolean voidType, String identifier, BlockNode block){
+    public MethodNode(String accessModifier, String type, Boolean voidType, String identifier, BlockNode block){
-        this.accesModifier = accessModifier;
+        this.accesModifier = new AccessModifierNode(accessModifier);
-        this.type = type;
+        this.type = new TypeNode(type);
         this.voidType = voidType;
         this.identifier = identifier;
         this.block = block;

src/main/java/ast/statement/ForStatementNode.java

@@ -1,21 +1,21 @@
 package ast.statement;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
 
-public class ForStatementNode implements ASTNode {
+public class ForStatementNode implements IStatementNode {
-    public ExpressionNode statementExpressionInit;
+    public IExpressionNode statementExpressionInit;
-    public StatementNode localVariableDeclarationInit;
+    public IStatementNode localVariableDeclarationInit;
-    public ExpressionNode expression;
+    public IExpressionNode expression;
-    public ExpressionNode statementExpression;
+    public IExpressionNode statementExpression;
 
-    public ForStatementNode(ExpressionNode statementExpressionInit, ExpressionNode expression, ExpressionNode statementExpression) {
+    public ForStatementNode(IExpressionNode statementExpressionInit, IExpressionNode expression, IExpressionNode statementExpression) {
         this.statementExpressionInit = statementExpressionInit;
         this.expression = expression;
         this.statementExpression = statementExpression;
     }
 
-    public ForStatementNode(StatementNode localVariableDeclarationInit, ExpressionNode expression, ExpressionNode statementExpression) {
+    public ForStatementNode(IStatementNode localVariableDeclarationInit, IExpressionNode expression, IExpressionNode statementExpression) {
         this.localVariableDeclarationInit = localVariableDeclarationInit;
         this.expression = expression;
         this.statementExpression = statementExpression;

src/main/java/ast/statement/IStatementNode.java

@@ -0,0 +1,6 @@
+package ast.statement;
+
+import ast.ASTNode;
+
+public interface IStatementNode extends ASTNode {
+}

src/main/java/ast/statement/LocalVariableDeclarationNode.java

@@ -1,16 +1,16 @@
 package ast.statement;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
 import ast.type.TypeNode;
 
-public class LocalVariableDeclarationNode implements ASTNode {
+public class LocalVariableDeclarationNode implements IStatementNode {
     public TypeNode type;
     public String identifier;
     public String assign;
-    public ExpressionNode expression;
+    public IExpressionNode expression;
 
-    public LocalVariableDeclarationNode(TypeNode type, String identifier, String assign, ExpressionNode expression) {
+    public LocalVariableDeclarationNode(TypeNode type, String identifier, String assign, IExpressionNode expression) {
         this.type = type;
         this.identifier = identifier;
         this.assign = assign;

src/main/java/ast/statement/ReturnStatementNode.java

@@ -1,16 +1,12 @@
 package ast.statement;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
-import ast.type.TypeNode;
 
-import java.util.ArrayList;
+public class ReturnStatementNode implements IStatementNode {
-import java.util.List;
+    public IExpressionNode expression;
 
-public class ReturnStatementNode implements ASTNode {
+    public ReturnStatementNode(IExpressionNode expression) {
-    public ExpressionNode expression;
-
-    public ReturnStatementNode(ExpressionNode expression) {
         this.expression = expression;
     }
 }

src/main/java/ast/statement/StatementNode.java

@@ -1,4 +0,0 @@
-package ast.statement;
-
-public class StatementNode {
-}

src/main/java/ast/statement/WhileStatementNode.java

@@ -2,13 +2,13 @@ package ast.statement;
 
 import ast.ASTNode;
 import ast.block.BlockNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
 
-public class WhileStatementNode implements ASTNode {
+public class WhileStatementNode implements IStatementNode {
-    public ExpressionNode expression;
+    public IExpressionNode expression;
     public BlockNode block;
 
-    public WhileStatementNode(ExpressionNode expression, BlockNode block) {
+    public WhileStatementNode(IExpressionNode expression, BlockNode block) {
         this.expression = expression;
         this.block = block;
     }

src/main/java/ast/statement/ifstatement/ElseStatementNode.java

@@ -2,8 +2,9 @@ package ast.statement.ifstatement;
 
 import ast.ASTNode;
 import ast.block.BlockNode;
+import ast.statement.IStatementNode;
 
-public class ElseStatementNode implements ASTNode {
+public class ElseStatementNode implements IStatementNode {
     public BlockNode block;
 
     public ElseStatementNode(BlockNode block) {

src/main/java/ast/statement/ifstatement/IfElseStatementNode.java

@@ -1,11 +1,12 @@
 package ast.statement.ifstatement;
 
 import ast.ASTNode;
+import ast.statement.IStatementNode;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class IfElseStatementNode implements ASTNode {
+public class IfElseStatementNode implements IStatementNode {
     public IfStatementNode ifStatement;
     public List<ElseStatementNode> elseStatements = new ArrayList<>();
 

src/main/java/ast/statement/ifstatement/IfStatementNode.java

@@ -2,13 +2,14 @@ package ast.statement.ifstatement;
 
 import ast.ASTNode;
 import ast.block.BlockNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
+import ast.statement.IStatementNode;
 
-public class IfStatementNode implements ASTNode {
+public class IfStatementNode implements IStatementNode {
-    public ExpressionNode expression;
+    public IExpressionNode expression;
     public BlockNode block;
 
-    public IfStatementNode(ExpressionNode expression, BlockNode block) {
+    public IfStatementNode(IExpressionNode expression, BlockNode block) {
         this.expression = expression;
         this.block = block;
     }

src/main/java/ast/statement/statementexpression/AssignStatementExpressionNode.java

@@ -1,13 +1,13 @@
 package ast.statement.statementexpression;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
 
-public class AssignStatementExpressionNode implements ASTNode {
+public class AssignStatementExpressionNode implements IStatementExpressionNode {
     public AssignableExpressionNode assignable;
-    public ExpressionNode expression;
+    public IExpressionNode expression;
 
-    public AssignStatementExpressionNode(AssignableExpressionNode assignable, ExpressionNode expression) {
+    public AssignStatementExpressionNode(AssignableExpressionNode assignable, IExpressionNode expression) {
         this.assignable = assignable;
         this.expression = expression;
     }

src/main/java/ast/statement/statementexpression/AssignableExpressionNode.java

@@ -3,7 +3,7 @@ package ast.statement.statementexpression;
 import ast.ASTNode;
 import ast.expression.unaryexpression.MemberAccessNode;
 
-public class AssignableExpressionNode implements ASTNode {
+public class AssignableExpressionNode implements IStatementExpressionNode {
     public String identifier;
     public MemberAccessNode memberAccess;
 

src/main/java/ast/statement/statementexpression/IStatementExpressionNode.java

@@ -0,0 +1,5 @@
+package ast.statement.statementexpression;
+
+import ast.statement.IStatementNode;
+
+public interface IStatementExpressionNode extends IStatementNode {}

src/main/java/ast/statement/statementexpression/NewDeclarationStatementExpressionNode.java

@@ -1,20 +1,20 @@
 package ast.statement.statementexpression;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class NewDeclarationStatementExpressionNode implements ASTNode {
+public class NewDeclarationStatementExpressionNode implements IStatementExpressionNode {
     public String identifier;
-    public List<ExpressionNode> expressions = new ArrayList<>();
+    public List<IExpressionNode> expressions = new ArrayList<>();
 
     public NewDeclarationStatementExpressionNode(String identifier) {
         this.identifier = identifier;
     }
 
-    public void addExpression(ExpressionNode expression) {
+    public void addExpression(IExpressionNode expression) {
         expressions.add(expression);
     }
 }

src/main/java/ast/statement/statementexpression/crementExpression/DecrementExpressionNode.java

@@ -2,8 +2,9 @@ package ast.statement.statementexpression.crementExpression;
 
 import ast.ASTNode;
 import ast.statement.statementexpression.AssignableExpressionNode;
+import ast.statement.statementexpression.IStatementExpressionNode;
 
-public class DecrementExpressionNode implements ASTNode {
+public class DecrementExpressionNode implements IStatementExpressionNode {
     public CrementType crementType;
     public AssignableExpressionNode assignableExpression;
 

src/main/java/ast/statement/statementexpression/crementExpression/IncrementExpressionNode.java

@@ -2,8 +2,9 @@ package ast.statement.statementexpression.crementExpression;
 
 import ast.ASTNode;
 import ast.statement.statementexpression.AssignableExpressionNode;
+import ast.statement.statementexpression.IStatementExpressionNode;
 
-public class IncrementExpressionNode implements ASTNode {
+public class IncrementExpressionNode implements IStatementExpressionNode {
     public CrementType crementType;
     public AssignableExpressionNode assignableExpression;
 

src/main/java/ast/statement/statementexpression/methodcallstatementnexpression/ChainedMethodNode.java

@@ -1,20 +1,20 @@
 package ast.statement.statementexpression.methodcallstatementnexpression;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
 
 import java.util.ArrayList;
 import java.util.List;
 
 public class ChainedMethodNode implements ASTNode {
     public String identifier;
-    public List<ExpressionNode> expressions = new ArrayList<>();
+    public List<IExpressionNode> expressions = new ArrayList<>();
 
     public ChainedMethodNode(String identifier) {
         this.identifier = identifier;
     }
 
-    public void addExpression(ExpressionNode expression) {
+    public void addExpression(IExpressionNode expression) {
         expressions.add(expression);
     }
 }

src/main/java/ast/statement/statementexpression/methodcallstatementnexpression/MethodCallStatementExpressionNode.java

@@ -1,16 +1,17 @@
 package ast.statement.statementexpression.methodcallstatementnexpression;
 
 import ast.ASTNode;
-import ast.expression.ExpressionNode;
+import ast.expression.IExpressionNode;
+import ast.statement.statementexpression.IStatementExpressionNode;
 
 import java.util.ArrayList;
 import java.util.List;
 
-public class MethodCallStatementExpressionNode implements ASTNode {
+public class MethodCallStatementExpressionNode implements IStatementExpressionNode {
     public TargetNode target;
     public List<ChainedMethodNode> chainedMethods = new ArrayList<>();
     public String identifier;
-    public List<ExpressionNode> expressions = new ArrayList<>();
+    public List<IExpressionNode> expressions = new ArrayList<>();
 
     public MethodCallStatementExpressionNode(TargetNode target, String identifier) {
         this.target = target;
@@ -21,7 +22,7 @@ public class MethodCallStatementExpressionNode implements ASTNode {
         chainedMethods.add(chainedMethode);
     }
 
-    public void addExpression(ExpressionNode expression) {
+    public void addExpression(IExpressionNode expression) {
         expressions.add(expression);
     }
 

src/main/java/parser/astBuilder/ASTBuilder.java

@@ -53,7 +53,7 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitConstructorDeclaration(SimpleJavaParser.ConstructorDeclarationContext ctx) {
-        ConstructorNode constructorNode = new ConstructorNode((AccessModifierNode) visit(ctx.AccessModifier()), ctx.Identifier().getText(), (BlockNode) visit(ctx.block()));
+        ConstructorNode constructorNode = new ConstructorNode(ctx.AccessModifier().getText(), ctx.Identifier().getText(), (BlockNode) visit(ctx.block()));
         for(SimpleJavaParser.ParameterContext parameter : ctx.parameterList().parameter()) {
             constructorNode.addParameter((ParameterNode) visit(parameter));
         }
@@ -66,13 +66,13 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
             return new MethodNode((BlockNode) visit(ctx.block()));
         } else {
             if(ctx.type() != null) {
-                MethodNode methodNode = new MethodNode((AccessModifierNode) visit(ctx.AccessModifier()), (TypeNode) visit(ctx.type()), false, ctx.Identifier().getText(), (BlockNode) visit(ctx.block()));
+                MethodNode methodNode = new MethodNode(ctx.AccessModifier().getText(), ctx.type().getText(), false, ctx.Identifier().getText(), (BlockNode) visit(ctx.block()));
                 for(SimpleJavaParser.ParameterContext parameter : ctx.parameterList().parameter()) {
                     methodNode.addParameter((ParameterNode) visit(parameter));
                 }
                 return methodNode;
             } else {
-                MethodNode methodNode = new MethodNode((AccessModifierNode) visit(ctx.AccessModifier()), null, true, ctx.Identifier().getText(), (BlockNode) visit(ctx.block()));
+                MethodNode methodNode = new MethodNode(ctx.AccessModifier().getText(), null, true, ctx.Identifier().getText(), (BlockNode) visit(ctx.block()));
                 for(SimpleJavaParser.ParameterContext parameter : ctx.parameterList().parameter()) {
                     methodNode.addParameter((ParameterNode) visit(parameter));
                 }
@@ -108,34 +108,34 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitReturnStatement(SimpleJavaParser.ReturnStatementContext ctx) {
-        return new ReturnStatementNode((ExpressionNode) visit(ctx.expression()));
+        return new ReturnStatementNode((IExpressionNode) visit(ctx.expression()));
     }
 
     @Override
     public ASTNode visitLocalVariableDeclaration(SimpleJavaParser.LocalVariableDeclarationContext ctx) {
-        return new LocalVariableDeclarationNode(new TypeNode(ctx.type().getText()), ctx.Identifier().getText(), ctx.Assign().getText(), (ExpressionNode) visit(ctx.expression()));
+        return new LocalVariableDeclarationNode(new TypeNode(ctx.type().getText()), ctx.Identifier().getText(), ctx.Assign().getText(), (IExpressionNode) visit(ctx.expression()));
     }
 
     @Override
     public ASTNode visitBlock(SimpleJavaParser.BlockContext ctx) {
         BlockNode blockNode = new BlockNode();
         for(SimpleJavaParser.StatementContext statement : ctx.statement()) {
-            blockNode.addStatement((StatementNode) visit(statement));
+            blockNode.addStatement((IStatementNode) visit(statement));
         }
         return blockNode;
     }
 
     @Override
     public ASTNode visitWhileStatement(SimpleJavaParser.WhileStatementContext ctx) {
-        return new WhileStatementNode((ExpressionNode) visit(ctx.expression()), (BlockNode) visit(ctx.block()));
+        return new WhileStatementNode((IExpressionNode) visit(ctx.expression()), (BlockNode) visit(ctx.block()));
     }
 
     @Override
     public ASTNode visitForStatement(SimpleJavaParser.ForStatementContext ctx) {
         if(ctx.statementExpression(0) != null) {
-            return new ForStatementNode((ExpressionNode) visit(ctx.statementExpression(0)), (ExpressionNode) visit(ctx.expression()), (ExpressionNode) visit(ctx.statementExpression(1)));
+            return new ForStatementNode((IExpressionNode) visit(ctx.statementExpression(0)), (IExpressionNode) visit(ctx.expression()), (IExpressionNode) visit(ctx.statementExpression(1)));
         } else if(ctx.localVariableDeclaration() != null) {
-            return new ForStatementNode((StatementNode) visit(ctx.localVariableDeclaration()), (ExpressionNode) visit(ctx.expression()), (ExpressionNode) visit(ctx.statementExpression(1)));
+            return new ForStatementNode((IStatementNode) visit(ctx.localVariableDeclaration()), (IExpressionNode) visit(ctx.expression()), (IExpressionNode) visit(ctx.statementExpression(1)));
         }
         return null;
     }
@@ -151,7 +151,7 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitIfStatement(SimpleJavaParser.IfStatementContext ctx) {
-        return new IfStatementNode((ExpressionNode) visit(ctx.expression()), (BlockNode) visit(ctx.block()));
+        return new IfStatementNode((IExpressionNode) visit(ctx.expression()), (BlockNode) visit(ctx.block()));
     }
 
     @Override
@@ -175,14 +175,14 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitAssign(SimpleJavaParser.AssignContext ctx) {
-        return new AssignStatementExpressionNode((AssignableExpressionNode) visit(ctx.assignableExpression()), (ExpressionNode) visit(ctx.expression()));
+        return new AssignStatementExpressionNode((AssignableExpressionNode) visit(ctx.assignableExpression()), (IExpressionNode) visit(ctx.expression()));
     }
 
     @Override
     public ASTNode visitNewDeclaration(SimpleJavaParser.NewDeclarationContext ctx) {
         NewDeclarationStatementExpressionNode newDeclarationStatementExpressionNode = new NewDeclarationStatementExpressionNode(ctx.Identifier().getText());
         for(SimpleJavaParser.ExpressionContext expression : ctx.argumentList().expression()) {
-            newDeclarationStatementExpressionNode.addExpression((ExpressionNode) visit(expression));
+            newDeclarationStatementExpressionNode.addExpression((IExpressionNode) visit(expression));
         }
         return newDeclarationStatementExpressionNode;
     }
@@ -194,7 +194,7 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
             methodCallStatementExpressionNode.addChainedMethod((ChainedMethodNode) visit(chainedMethod));
         }
         for(SimpleJavaParser.ExpressionContext expression : ctx.argumentList().expression()) {
-            methodCallStatementExpressionNode.addExpression((ExpressionNode) visit(expression));
+            methodCallStatementExpressionNode.addExpression((IExpressionNode) visit(expression));
         }
         return methodCallStatementExpressionNode;
     }
@@ -217,7 +217,7 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
     public ASTNode visitChainedMethod(SimpleJavaParser.ChainedMethodContext ctx) {
         ChainedMethodNode chainedMethodNode = new ChainedMethodNode(ctx.Identifier().getText());
         for(SimpleJavaParser.ExpressionContext expression : ctx.argumentList().expression()) {
-            chainedMethodNode.addExpression((ExpressionNode) visit(expression));
+            chainedMethodNode.addExpression((IExpressionNode) visit(expression));
         }
         return chainedMethodNode;
     }
@@ -295,9 +295,9 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
         } else if(ctx.notExpression() != null) {
             return new UnaryExpressionNode((NotExpressionNode) visitNotExpression(ctx.notExpression()));
         } else if(ctx.statementExpression() != null) {
-            return new UnaryExpressionNode((StatementNode) visitStatementExpression(ctx.statementExpression()));
+            return new UnaryExpressionNode((IStatementNode) visitStatementExpression(ctx.statementExpression()));
         } else if(ctx.expression() != null) {
-            return new UnaryExpressionNode((ExpressionNode) visitExpression(ctx.expression()));
+            return new UnaryExpressionNode((IExpressionNode) visitExpression(ctx.expression()));
         }
         return null;
     }
@@ -332,7 +332,7 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitNotExpression(SimpleJavaParser.NotExpressionContext ctx) {
-        return new NotExpressionNode((ExpressionNode) visitExpression(ctx.expression()));
+        return new NotExpressionNode((IExpressionNode) visitExpression(ctx.expression()));
     }
 
 
@@ -382,7 +382,7 @@ public class ASTBuilder extends SimpleJavaBaseVisitor<ASTNode> {
 
     @Override
     public ASTNode visitNonCalculationExpression(SimpleJavaParser.NonCalculationExpressionContext ctx) {
-        return new NonCalculationExpressionNode((UnaryExpressionNode) visit(ctx.unaryExpression()), ctx.nonCalculationOperator().getText(), (ExpressionNode) visit(ctx.expression()));
+        return new NonCalculationExpressionNode((UnaryExpressionNode) visit(ctx.unaryExpression()), ctx.nonCalculationOperator().getText(), (IExpressionNode) visit(ctx.expression()));
     }
 
     @Override

src/main/resources/CompilerInput.java

@@ -11,8 +11,7 @@ public class Example {
 public class Test {
 
     public static int testMethod(char x, int a){
-
+        x = x + a;
-
+        return x;
-
     }
 }