%PDF-
%PDF-
Mini Shell
Mini Shell
<?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|null $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 {
}
Zerion Mini Shell 1.0