Move DiffEngine and helpers to includes/libs/Diff and put them in a namespace

I will address the dependencies on MW core in a followup.

Bug: T339184
Change-Id: I892364b0c9f15c9de4cfc29c683670c172d71764

1 files changed, 0 insertions, 163 deletions

diff --git a/includes/diff/Diff.php b/includes/diff/Diff.php
deleted file mode 100644
index 4e0c29d28844..000000000000
--- a/includes/diff/Diff.php
+++ /dev/null
@@ -1,163 +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
- */
-
-/**
- * Class representing a 'diff' between two sequences of strings.
- * @newable
- * @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.
-	 *
-	 * @stable to call
-	 * @todo Don't do work in the constructor, use a service to create diffs instead (T257472).
-	 *
-	 * @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 self 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;
-	}
-}