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Diffstat (limited to 'www/wiki/includes/diff/DairikiDiff.php')
| -rw-r--r-- | www/wiki/includes/diff/DairikiDiff.php | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/www/wiki/includes/diff/DairikiDiff.php b/www/wiki/includes/diff/DairikiDiff.php new file mode 100644 index 00000000..d76af31a --- /dev/null +++ b/www/wiki/includes/diff/DairikiDiff.php @@ -0,0 +1,334 @@ +<?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. + * + * @private + * @ingroup DifferenceEngine + */ +abstract class DiffOp { + + /** + * @var string + */ + public $type; + + /** + * @var string[] + */ + public $orig; + + /** + * @var string[] + */ + public $closing; + + /** + * @return string + */ + public function getType() { + return $this->type; + } + + /** + * @return string[] + */ + public function getOrig() { + return $this->orig; + } + + /** + * @param int $i + * @return string[]|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; + } + + abstract public function reverse(); + + /** + * @return int + */ + public function norig() { + return $this->orig ? count( $this->orig ) : 0; + } + + /** + * @return int + */ + public function nclosing() { + return $this->closing ? count( $this->closing ) : 0; + } +} + +/** + * Extends DiffOp. Used to mark strings that have been + * copied from one string array to the other. + * + * @private + * @ingroup DifferenceEngine + */ +class DiffOpCopy extends DiffOp { + public $type = 'copy'; + + public function __construct( $orig, $closing = false ) { + if ( !is_array( $closing ) ) { + $closing = $orig; + } + $this->orig = $orig; + $this->closing = $closing; + } + + /** + * @return DiffOpCopy + */ + public function reverse() { + return new DiffOpCopy( $this->closing, $this->orig ); + } +} + +/** + * Extends DiffOp. Used to mark strings that have been + * deleted from the first string array. + * + * @private + * @ingroup DifferenceEngine + */ +class DiffOpDelete extends DiffOp { + public $type = 'delete'; + + public function __construct( $lines ) { + $this->orig = $lines; + $this->closing = false; + } + + /** + * @return DiffOpAdd + */ + public function reverse() { + return new DiffOpAdd( $this->orig ); + } +} + +/** + * Extends DiffOp. Used to mark strings that have been + * added from the first string array. + * + * @private + * @ingroup DifferenceEngine + */ +class DiffOpAdd extends DiffOp { + public $type = 'add'; + + public function __construct( $lines ) { + $this->closing = $lines; + $this->orig = false; + } + + /** + * @return DiffOpDelete + */ + public function reverse() { + return new DiffOpDelete( $this->closing ); + } +} + +/** + * Extends DiffOp. Used to mark strings that have been + * changed from the first string array (both added and subtracted). + * + * @private + * @ingroup DifferenceEngine + */ +class DiffOpChange extends DiffOp { + public $type = 'change'; + + public function __construct( $orig, $closing ) { + $this->orig = $orig; + $this->closing = $closing; + } + + /** + * @return DiffOpChange + */ + public function reverse() { + return new DiffOpChange( $this->closing, $this->orig ); + } +} + +/** + * Class representing a 'diff' between two sequences of strings. + * @todo document + * @private + * @ingroup DifferenceEngine + */ +class Diff { + + /** + * @var DiffOp[] + */ + public $edits; + + /** + * @var int If this diff complexity is exceeded, a ComplexityException is thrown + * 0 means no limit. + */ + protected $bailoutComplexity = 0; + + /** + * Computes diff between sequences of strings. + * + * @param string[] $from_lines An array of strings. + * Typically these are lines from a file. + * @param string[] $to_lines An array of strings. + * @throws \MediaWiki\Diff\ComplexityException + */ + public function __construct( $from_lines, $to_lines ) { + $eng = new DiffEngine; + $eng->setBailoutComplexity( $this->bailoutComplexity ); + $this->edits = $eng->diff( $from_lines, $to_lines ); + } + + /** + * @return DiffOp[] + */ + public function getEdits() { + return $this->edits; + } + + /** + * Compute reversed Diff. + * + * SYNOPSIS: + * + * $diff = new Diff($lines1, $lines2); + * $rev = $diff->reverse(); + * + * @return Object A Diff object representing the inverse of the + * original diff. + */ + public function reverse() { + $rev = $this; + $rev->edits = []; + /** @var DiffOp $edit */ + foreach ( $this->edits as $edit ) { + $rev->edits[] = $edit->reverse(); + } + + return $rev; + } + + /** + * Check for empty diff. + * + * @return bool True if two sequences were identical. + */ + public function isEmpty() { + foreach ( $this->edits as $edit ) { + if ( $edit->type != 'copy' ) { + return false; + } + } + + return true; + } + + /** + * Compute the length of the Longest Common Subsequence (LCS). + * + * This is mostly for diagnostic purposed. + * + * @return int The length of the LCS. + */ + public function lcs() { + $lcs = 0; + foreach ( $this->edits as $edit ) { + if ( $edit->type == 'copy' ) { + $lcs += count( $edit->orig ); + } + } + + return $lcs; + } + + /** + * Get the original set of lines. + * + * This reconstructs the $from_lines parameter passed to the + * constructor. + * + * @return string[] The original sequence of strings. + */ + public function orig() { + $lines = []; + + foreach ( $this->edits as $edit ) { + if ( $edit->orig ) { + array_splice( $lines, count( $lines ), 0, $edit->orig ); + } + } + + return $lines; + } + + /** + * Get the closing set of lines. + * + * This reconstructs the $to_lines parameter passed to the + * constructor. + * + * @return string[] The sequence of strings. + */ + public function closing() { + $lines = []; + + foreach ( $this->edits as $edit ) { + if ( $edit->closing ) { + array_splice( $lines, count( $lines ), 0, $edit->closing ); + } + } + + return $lines; + } +} + +/** + * @deprecated Alias for WordAccumulator, to be soon removed + */ +class HWLDFWordAccumulator extends MediaWiki\Diff\WordAccumulator { +} |