function testUnscan()
{
$sc = new StringScanner("foobar blorg bla");
$res = $sc->scan("foo(bar) (\\w+)");
$this->assertEqual($res, "foobar blorg");
$this->assertEqual($sc[0], "foobar blorg");
$this->assertEqual($sc[1], "bar");
$this->assertEqual($sc[2], "blorg");
$this->assertEqual($sc->rest(), " bla");
$this->assertEqual($sc->wasMatched(), true);
$sc->unScan();
$this->assertEqual($sc->pos, 0);
$this->assertEqual($sc[0], null);
try {
$sc->unScan();
$this->assertFalse(true);
} catch (Exception $e) {
$this->assertEqual($e->getMessage(), "unScan failed, previous match had failed");
}
$res = $sc->isMatch("foo");
$this->assertEqual($sc[0], "foo");
$res = $sc->isMatch("foobar");
$this->assertEqual($sc[0], "foobar");
$sc->unScan();
$this->assertEqual($sc[0], "foo");
$res = $sc->scan("foobar ");
$this->assertEqual($sc->rest(), "blorg bla");
$sc->unScan();
$this->assertEqual($sc->rest(), "foobar blorg bla");
}
