Dominicsbranch

src/ASTPrinter.java

+public class ASTPrinter implements  Visitor<String>{
+    @Override
+    public String visit(final Parser.BinaryOperation binaryOP) {
+        StringBuffer sb = new StringBuffer();
+        if(binaryOP.capsuled) {
+            sb.append("(");
+        }
+        sb.append(binaryOP.leftExpression.accept(this));
+        sb.append(binaryOP.operator);
+        sb.append(binaryOP.rightExpression.accept(this));
+        if(binaryOP.capsuled) {
+            sb.append(")");
+        }
+        return sb.toString();
+    }
+
+    @Override
+    public String visit(Parser.Variable variable) {
+        return variable.variableName;
+    }
+
+    @Override
+    public String visit(Parser.Number number) {
+        return number.digits;
+    }
+
+    @Override
+    public String visit(Parser.Decimal decimal) {
+        return decimal.beforeDot.digits + "." + decimal.afterDot.digits;
+    }
+
+    public String visit(final Parser.Expression ast) {
+        if(ast==null) {
+            throw new RuntimeException("AST is null");
+        }
+        return ast.accept(this);
+    }
+}