Split DairikiDiff to class per file
authorReedy <reedy@wikimedia.org>
Sun, 14 Apr 2019 22:13:01 +0000 (23:13 +0100)
committerReedy <reedy@wikimedia.org>
Sun, 14 Apr 2019 22:37:52 +0000 (23:37 +0100)
Change-Id: Ica426312ec69707b9a99dfe2a7deee945c38ba35

.phpcs.xml
autoload.php
includes/diff/DairikiDiff.php [deleted file]
includes/diff/Diff.php [new file with mode: 0644]
includes/diff/DiffOp.php [new file with mode: 0644]
includes/diff/DiffOpAdd.php [new file with mode: 0644]
includes/diff/DiffOpChange.php [new file with mode: 0644]
includes/diff/DiffOpCopy.php [new file with mode: 0644]
includes/diff/DiffOpDelete.php [new file with mode: 0644]

index 49dbb46..cc9e53c 100644 (file)
@@ -71,7 +71,6 @@
                        any new occurrences.
                -->
                <exclude-pattern>*/includes/specials/SpecialMostinterwikis\.php</exclude-pattern>
-               <exclude-pattern>*/includes/diff/DairikiDiff\.php</exclude-pattern>
                <exclude-pattern>*/includes/specials/SpecialAncientpages\.php</exclude-pattern>
                <exclude-pattern>*/includes/specials/SpecialBrokenRedirects\.php</exclude-pattern>
                <exclude-pattern>*/includes/specials/SpecialConfirmemail\.php</exclude-pattern>
                        any new occurrences.
                -->
                <exclude-pattern>*/includes/api/ApiErrorFormatter\.php</exclude-pattern>
-               <exclude-pattern>*/includes/diff/DairikiDiff\.php</exclude-pattern>
                <exclude-pattern>*/includes/parser/Preprocessor_DOM\.php</exclude-pattern>
                <exclude-pattern>*/includes/parser/Preprocessor_Hash\.php</exclude-pattern>
                <exclude-pattern>*/includes/parser/Preprocessor\.php</exclude-pattern>
index e73b197..f1668a1 100644 (file)
@@ -395,15 +395,15 @@ $wgAutoloadLocalClasses = [
        'DerivativeRequest' => __DIR__ . '/includes/DerivativeRequest.php',
        'DerivativeResourceLoaderContext' => __DIR__ . '/includes/resourceloader/DerivativeResourceLoaderContext.php',
        'DescribeFileOp' => __DIR__ . '/includes/libs/filebackend/fileop/DescribeFileOp.php',
-       'Diff' => __DIR__ . '/includes/diff/DairikiDiff.php',
+       'Diff' => __DIR__ . '/includes/diff/Diff.php',
        'DiffEngine' => __DIR__ . '/includes/diff/DiffEngine.php',
        'DiffFormatter' => __DIR__ . '/includes/diff/DiffFormatter.php',
        'DiffHistoryBlob' => __DIR__ . '/includes/historyblob/DiffHistoryBlob.php',
-       'DiffOp' => __DIR__ . '/includes/diff/DairikiDiff.php',
-       'DiffOpAdd' => __DIR__ . '/includes/diff/DairikiDiff.php',
-       'DiffOpChange' => __DIR__ . '/includes/diff/DairikiDiff.php',
-       'DiffOpCopy' => __DIR__ . '/includes/diff/DairikiDiff.php',
-       'DiffOpDelete' => __DIR__ . '/includes/diff/DairikiDiff.php',
+       'DiffOp' => __DIR__ . '/includes/diff/DiffOp.php',
+       'DiffOpAdd' => __DIR__ . '/includes/diff/DiffOpAdd.php',
+       'DiffOpChange' => __DIR__ . '/includes/diff/DiffOpChange.php',
+       'DiffOpCopy' => __DIR__ . '/includes/diff/DiffOpCopy.php',
+       'DiffOpDelete' => __DIR__ . '/includes/diff/DiffOpDelete.php',
        'DifferenceEngine' => __DIR__ . '/includes/diff/DifferenceEngine.php',
        'DifferenceEngineSlotDiffRenderer' => __DIR__ . '/includes/diff/DifferenceEngineSlotDiffRenderer.php',
        'Digit2Html' => __DIR__ . '/maintenance/language/digit2html.php',
diff --git a/includes/diff/DairikiDiff.php b/includes/diff/DairikiDiff.php
deleted file mode 100644 (file)
index 4e919bc..0000000
+++ /dev/null
@@ -1,328 +0,0 @@
-<?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;
-       }
-}
diff --git a/includes/diff/Diff.php b/includes/diff/Diff.php
new file mode 100644 (file)
index 0000000..2dab88b
--- /dev/null
@@ -0,0 +1,160 @@
+<?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
+ */
+
+/**
+ * Class representing a 'diff' between two sequences of strings.
+ * @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;
+       }
+}
diff --git a/includes/diff/DiffOp.php b/includes/diff/DiffOp.php
new file mode 100644 (file)
index 0000000..2a1f3e1
--- /dev/null
@@ -0,0 +1,97 @@
+<?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;
+       }
+}
diff --git a/includes/diff/DiffOpAdd.php b/includes/diff/DiffOpAdd.php
new file mode 100644 (file)
index 0000000..3f95e8d
--- /dev/null
@@ -0,0 +1,49 @@
+<?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
+ */
+
+/**
+ * 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 );
+       }
+}
diff --git a/includes/diff/DiffOpChange.php b/includes/diff/DiffOpChange.php
new file mode 100644 (file)
index 0000000..bde9287
--- /dev/null
@@ -0,0 +1,49 @@
+<?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
+ */
+
+/**
+ * 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 );
+       }
+}
diff --git a/includes/diff/DiffOpCopy.php b/includes/diff/DiffOpCopy.php
new file mode 100644 (file)
index 0000000..904ee58
--- /dev/null
@@ -0,0 +1,52 @@
+<?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
+ */
+
+/**
+ * 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 );
+       }
+}
diff --git a/includes/diff/DiffOpDelete.php b/includes/diff/DiffOpDelete.php
new file mode 100644 (file)
index 0000000..22b65ab
--- /dev/null
@@ -0,0 +1,49 @@
+<?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
+ */
+
+/**
+ * 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 );
+       }
+}