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<?php
/**
* Portions 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
*/
/**
* MediaWiki default table style diff formatter
* @todo document
* @private
* @ingroup DifferenceEngine
*/
class TableDiffFormatter extends DiffFormatter {
function __construct() {
$this->leadingContextLines = 2;
$this->trailingContextLines = 2;
}
/**
* @static
* @param string $msg
*
* @return mixed
*/
public static function escapeWhiteSpace( $msg ) {
$msg = preg_replace( '/^ /m', '  ', $msg );
$msg = preg_replace( '/ $/m', '  ', $msg );
$msg = preg_replace( '/ /', '  ', $msg );
return $msg;
}
/**
* @param int $xbeg
* @param int $xlen
* @param int $ybeg
* @param int $ylen
*
* @return string
*/
protected function blockHeader( $xbeg, $xlen, $ybeg, $ylen ) {
// '<!--LINE \d+ -->' get replaced by a localised line number
// in DifferenceEngine::localiseLineNumbers
$r = '<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l' .
$xbeg .
'" ><!--LINE ' .
$xbeg .
"--></td>\n" .
'<td colspan="2" class="diff-lineno"><!--LINE ' .
$ybeg .
"--></td></tr>\n";
return $r;
}
/**
* Writes the header to the output buffer.
*
* @param string $header
*/
protected function startBlock( $header ) {
$this->writeOutput( $header );
}
protected function endBlock() {
}
/**
* @param string[] $lines
* @param string $prefix
* @param string $color
*/
protected function lines( $lines, $prefix = ' ', $color = 'white' ) {
}
/**
* HTML-escape parameter before calling this
*
* @param string $line
*
* @return string
*/
protected function addedLine( $line ) {
return $this->wrapLine( '+', 'diff-addedline', $line );
}
/**
* HTML-escape parameter before calling this
*
* @param string $line
*
* @return string
*/
protected function deletedLine( $line ) {
return $this->wrapLine( '−', 'diff-deletedline', $line );
}
/**
* HTML-escape parameter before calling this
*
* @param string $line
*
* @return string
*/
protected function contextLine( $line ) {
return $this->wrapLine( ' ', 'diff-context', $line );
}
/**
* @param string $marker
* @param string $class Unused
* @param string $line
*
* @return string
*/
protected function wrapLine( $marker, $class, $line ) {
if ( $line !== '' ) {
// The <div> wrapper is needed for 'overflow: auto' style to scroll properly
$line = Xml::tags( 'div', null, $this->escapeWhiteSpace( $line ) );
}
return "<td class='diff-marker'>$marker</td><td class='$class'>$line</td>";
}
/**
* @return string
*/
protected function emptyLine() {
return '<td colspan="2"> </td>';
}
/**
* Writes all lines to the output buffer, each enclosed in <tr>.
*
* @param string[] $lines
*/
protected function added( $lines ) {
foreach ( $lines as $line ) {
$this->writeOutput( '<tr>' . $this->emptyLine() .
$this->addedLine( '<ins class="diffchange">' .
htmlspecialchars( $line ) . '</ins>' ) . "</tr>\n" );
}
}
/**
* Writes all lines to the output buffer, each enclosed in <tr>.
*
* @param string[] $lines
*/
protected function deleted( $lines ) {
foreach ( $lines as $line ) {
$this->writeOutput( '<tr>' . $this->deletedLine( '<del class="diffchange">' .
htmlspecialchars( $line ) . '</del>' ) .
$this->emptyLine() . "</tr>\n" );
}
}
/**
* Writes all lines to the output buffer, each enclosed in <tr>.
*
* @param string[] $lines
*/
protected function context( $lines ) {
foreach ( $lines as $line ) {
$this->writeOutput( '<tr>' .
$this->contextLine( htmlspecialchars( $line ) ) .
$this->contextLine( htmlspecialchars( $line ) ) . "</tr>\n" );
}
}
/**
* Writes the two sets of lines to the output buffer, each enclosed in <tr>.
*
* @param string[] $orig
* @param string[] $closing
*/
protected function changed( $orig, $closing ) {
$diff = new WordLevelDiff( $orig, $closing );
$del = $diff->orig();
$add = $diff->closing();
# Notice that WordLevelDiff returns HTML-escaped output.
# Hence, we will be calling addedLine/deletedLine without HTML-escaping.
$ndel = count( $del );
$nadd = count( $add );
$n = max( $ndel, $nadd );
for ( $i = 0; $i < $n; $i++ ) {
$delLine = $i < $ndel ? $this->deletedLine( $del[$i] ) : $this->emptyLine();
$addLine = $i < $nadd ? $this->addedLine( $add[$i] ) : $this->emptyLine();
$this->writeOutput( "<tr>{$delLine}{$addLine}</tr>\n" );
}
}
}