public function testDelta()
{
// Convert a diff into delta string.
$this->d->setChanges(array(array(Diff::EQUAL, "jump"), array(Diff::DELETE, "s"), array(Diff::INSERT, "ed"), array(Diff::EQUAL, " over "), array(Diff::DELETE, "the"), array(Diff::INSERT, "a"), array(Diff::EQUAL, " lazy"), array(Diff::INSERT, "old dog")));
$text1 = $this->d->text1();
$this->assertEquals("jumps over the lazy", $text1);
$delta = $this->d->toDelta();
$this->assertEquals("=4\t-1\t+ed\t=6\t-3\t+a\t=5\t+old dog", $delta);
// Convert delta string into a diff.
$this->assertEquals($this->d->getChanges(), $this->d->fromDelta($text1, $delta)->getChanges());
// Generates error (19 != 20).
try {
$this->d->fromDelta($text1 . 'x', $delta);
$this->fail();
} catch (\InvalidArgumentException $e) {
}
// Generates error (19 != 18).
try {
$this->d->fromDelta(mb_substr($text1, 1), $delta);
$this->fail();
} catch (\InvalidArgumentException $e) {
}
// Test deltas with special characters.
$this->d->setChanges(array(array(Diff::EQUAL, Utils::unicodeChr(0x680) . " \t %"), array(Diff::DELETE, Utils::unicodeChr(0x681) . " \n ^"), array(Diff::INSERT, Utils::unicodeChr(0x682) . " \\ |")));
$text1 = $this->d->text1();
$this->assertEquals(Utils::unicodeChr(0x680) . " \t %" . Utils::unicodeChr(0x681) . " \n ^", $text1);
$delta = $this->d->toDelta();
$this->assertEquals("=7\t-7\t+%DA%82 %02 %5C %7C", $delta);
// Convert delta string into a diff.
$this->assertEquals($this->d->getChanges(), $this->d->fromDelta($text1, $delta)->getChanges());
// Verify pool of unchanged characters.
$this->d->setChanges(array(array(Diff::INSERT, "A-Z a-z 0-9 - _ . ! ~ * ' ( ) ; / ? : @ & = + \$ , # ")));
$text2 = $this->d->text2();
$this->assertEquals("A-Z a-z 0-9 - _ . ! ~ * ' ( ) ; / ? : @ & = + \$ , # ", $text2);
$delta = $this->d->toDelta();
$this->assertEquals("+A-Z a-z 0-9 - _ . ! ~ * ' ( ) ; / ? : @ & = + \$ , # ", $delta);
// Convert delta string into a diff.
$this->assertEquals($this->d->getChanges(), $this->d->fromDelta("", $delta)->getChanges());
}