Merge remote-tracking branch 'origin/master'

src/main/java/abstractSyntaxTree/Expression/UnaryExpression.java

@@ -15,8 +15,8 @@ import java.util.Objects;
 
 public class UnaryExpression extends AbstractType implements IExpression{
     public String operator;
-    public IDatatype operand;
-    public UnaryExpression(String operator, IDatatype operand){
+    public IExpression operand;
+    public UnaryExpression(String operator, IExpression operand){
         this.operator = operator;
         this.operand = operand;
     }

src/main/java/astGenerator/ASTGenerator.java

@@ -271,7 +271,8 @@ public class ASTGenerator extends DecafBaseVisitor<Node> {
         } else if (ctx.value() != null) {
             return visitValue(ctx.value());
         } else if (ctx.binaryExpr() != null) {
-            //todo
+            IExpression expression = (IExpression) visit(ctx.binaryExpr());
+            return new UnaryExpression("!", expression);
         }
         return null;
     }