--- /dev/null
+<?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 {
+}
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