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<?php
/**
* A PHP diff engine for phpwiki. (Taken from phpwiki-1.3.3)
*
* Copyright © 2000, 2001 Geoffrey T. Dairiki <dairiki@dairiki.org>
* You may copy this code freely under the conditions of the GPL.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup DifferenceEngine
* @defgroup DifferenceEngine DifferenceEngine
*/
/**
* The base class for all other DiffOp classes.
*
* The classes that extend DiffOp are: DiffOpCopy, DiffOpDelete, DiffOpAdd and
* DiffOpChange. FakeDiffOp also extends DiffOp, but it is not located in this file.
*
* @internal
* @ingroup DifferenceEngine
*/
abstract class DiffOp {
/**
* @var string
* @private Please use {@see getType}
*/
public $type;
/**
* @var string[]|false The left ("old") side of the diff, or false when it's an "add"
* @private Please use {@see getOrig}
*/
public $orig;
/**
* @var string[]|false The right ("new") side of the diff, or false when it's a "delete"
* @private Please use {@see getClosing}
*/
public $closing;
/**
* @return string Either "add", "change", "copy", or "delete"
*/
public function getType() {
return $this->type;
}
/**
* Returns either all lines on the left ("old") side of the diff, or false when it's an add
* operation.
*
* @return string[]|false
*/
public function getOrig() {
return $this->orig;
}
/**
* Without a line number this returns either all lines on the right ("new") side of the diff, or
* false when it's a delete operation.
*
* With a line number this returns either the line or null if the line doesn't exist.
*
* @param int|null $i Line number, or null for all lines in the operation
* @return string[]|false|string|null
*/
public function getClosing( $i = null ) {
if ( $i === null ) {
return $this->closing;
}
if ( array_key_exists( $i, $this->closing ) ) {
return $this->closing[$i];
}
return null;
}
/**
* @return self Inverted operation (a.k.a. revert or undo), e.g. "delete" becomes "add"
*/
abstract public function reverse();
/**
* @return int Number of lines on the left ("old") side of the diff, {@see getOrig}
*/
public function norig() {
return $this->orig ? count( $this->orig ) : 0;
}
/**
* @return int Number of lines on the right ("new") side of the diff, see {@see getClosing}
*/
public function nclosing() {
return $this->closing ? count( $this->closing ) : 0;
}
}
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