ActionTest.java

/*
 * Copyright (C) 2009-2011 Mathias Doenitz
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.github.fge.grappa.action;

import com.github.fge.grappa.Grappa;
import com.github.fge.grappa.annotations.Label;
import com.github.fge.grappa.parsers.BaseActions;
import com.github.fge.grappa.parsers.BaseParser;
import com.github.fge.grappa.rules.Action;
import com.github.fge.grappa.rules.Rule;
import com.github.fge.grappa.run.context.Context;
import com.github.fge.grappa.test.ParboiledTest;
import org.testng.annotations.Test;

public class ActionTest
    extends ParboiledTest<Integer>
{

    public static class Actions
        extends BaseActions<Integer>
    {

        public boolean addOne()
        {
            final Integer i = getContext().getValueStack().pop();
            getContext().getValueStack().push(i + 1);
            return true;
        }
    }

    public static class Parser
        extends BaseParser<Integer>
    {

        final Actions actions = new Actions();

        public Rule A()
        {
            return sequence(
                'a',
                push(42),
                B(18),
                stringAction("lastText:" + match())
            );
        }

        public Rule B(final int i)
        {
            final int j = i + 1;
            return sequence(
                'b',
                push(timesTwo(i + j)),
                C(),
                push(pop()) // no effect
            );
        }

        public Rule C()
        {
            return sequence(
                'c',
                push(pop()), // no effect
                // FIXME: turning into a lambda throws IllegalAccessException...
                new Action<Integer>()
                {
                    @Override
                    public boolean run(final Context<Integer> context) {
                        return getContext() == context;
                    }
                },
                D(1)
            );
        }

        @Label("Last")
        public Rule D(final int i)
        {
            return sequence(
                'd', dup(),
                push(i),
                actions.addOne()
            );
        }

        public boolean stringAction(final String string)
        {
            return "lastText:bcd".equals(string);
        }

        // ************* ACTIONS **************

        public int timesTwo(final int i)
        {
            return i * 2;
        }

    }

    @Test
    public void test()
    {
        final Parser parser = Grappa.createParser(Parser.class);
        test(parser.A(), "abcd").hasNoErrors();
    }

}