package org.apidesign.test.visitor;

import org.apidesign.test.visitor.PrintTest.PrintVisitor;

import org.apidesign.visitor.Language.Expression;

import org.apidesign.visitor.Language.Minus;

import org.apidesign.visitor.Language.Number;

import static junit.framework.Assert.*;

import org.apidesign.visitor.Language.Visitor;

import org.junit.Test;

public class PrintOfMinusStructureTest {

    public static Minus newMinus(

        final Expression first, final Expression second

    ) {

        return new Minus() {

            public Expression getFirst() {

                return first;

            }

            public Expression getSecond() {

                return second;

            }

            public void visit(Visitor v) {

                v.dispatchMinus(this);

            }

        };

    }

    @Test public void printOneMinusTwo() {

        Number one = PrintTest.newNumber(1);

        Number two = PrintTest.newNumber(2);

        Expression plus = newMinus(one, two);

        PrintVisitor print = new PrintVisitor();

        plus.visit(Visitor.create(print));

        if (Boolean.getBoolean("no.failures")) {

            assertEquals("unknown12", print.sb.toString());

            return;

        }

        assertEquals("1 - 2", print.sb.toString());

    }

}