src/testcases/org/apache/tools/ant/util/regexp/RegexpMatcherTest.java

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package org.apache.tools.ant.util.regexp;

import java.util.Vector;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

/**
 * Tests for all implementations of the RegexpMatcher interface.
 *
 * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a> 
 */
public abstract class RegexpMatcherTest extends TestCase {

    public abstract RegexpMatcher getImplementation();

    public RegexpMatcherTest(String name) {
        super(name);
    }

    public void testMatches() {
        RegexpMatcher reg = getImplementation();
        reg.setPattern("aaaa");
        assert("aaaa should match itself", reg.matches("aaaa"));
        assert("aaaa should match xaaaa", reg.matches("xaaaa"));
        assert("aaaa shouldn\'t match xaaa", !reg.matches("xaaa"));
        reg.setPattern("^aaaa");
        assert("^aaaa shouldn\'t match xaaaa", !reg.matches("xaaaa"));
        assert("^aaaa should match aaaax", reg.matches("aaaax"));
        reg.setPattern("aaaa$");
        assert("aaaa$ shouldn\'t match aaaax", !reg.matches("aaaax"));
        assert("aaaa$ should match xaaaa", reg.matches("xaaaa"));
        reg.setPattern("[0-9]+");
        assert("[0-9]+ should match 123", reg.matches("123"));
        assert("[0-9]+ should match 1", reg.matches("1"));
        assert("[0-9]+ shouldn\'t match \'\'", !reg.matches(""));
        assert("[0-9]+ shouldn\'t match a", !reg.matches("a"));
        reg.setPattern("[0-9]*");
        assert("[0-9]* should match 123", reg.matches("123"));
        assert("[0-9]* should match 1", reg.matches("1"));
        assert("[0-9]* should match \'\'", reg.matches(""));
        assert("[0-9]* should match a", reg.matches("a"));
        reg.setPattern("([0-9]+)=\\1");
        assert("([0-9]+)=\\1 should match 1=1", reg.matches("1=1"));
        assert("([0-9]+)=\\1 shouldn\'t match 1=2", !reg.matches("1=2"));
    }

    public void testGroups() {
        RegexpMatcher reg = getImplementation();
        reg.setPattern("aaaa");
        Vector v = reg.getGroups("xaaaa");
        assertEquals("No parens -> no extra groups", 1, v.size());
        assertEquals("Trivial match with no parens", "aaaa", 
                     (String) v.elementAt(0));

        reg.setPattern("(aaaa)");
        v = reg.getGroups("xaaaa");
        assertEquals("Trivial match with single paren", 2, v.size());
        assertEquals("Trivial match with single paren, full match", "aaaa", 
                     (String) v.elementAt(0));
        assertEquals("Trivial match with single paren, matched paren", "aaaa", 
                     (String) v.elementAt(0));

        reg.setPattern("(a+)b(b+)");
        v = reg.getGroups("xaabb");
        assertEquals(3, v.size());
        assertEquals("aabb", (String) v.elementAt(0));
        assertEquals("aa", (String) v.elementAt(1));
        assertEquals("b", (String) v.elementAt(2));
    }
}