+
+ /**
+ * Get diff table, including header
+ * Note that the interface has changed, it's no longer static.
+ * Returns false on error
+ */
+ function getDiff( $otitle, $ntitle ) {
+ $body = $this->getDiffBody();
+ if ( $body === false ) {
+ return false;
+ } else {
+ return $this->addHeader( $body, $otitle, $ntitle );
+ }
+ }
+
+ /**
+ * Get the diff table body, without header
+ * Results are cached
+ * Returns false on error
+ */
+ function getDiffBody() {
+ global $wgMemc, $wgDBname;
+ $fname = 'DifferenceEngine::getDiffBody';
+ wfProfileIn( $fname );
+
+ // Cacheable?
+ $key = false;
+ if ( $this->mOldid && $this->mNewid ) {
+ // Try cache
+ $key = "$wgDBname:diff:oldid:{$this->mOldid}:newid:{$this->mNewid}";
+ $difftext = $wgMemc->get( $key );
+ if ( $difftext ) {
+ wfIncrStats( 'diff_cache_hit' );
+ $difftext = $this->localiseLineNumbers( $difftext );
+ $difftext .= "\n<!-- diff cache key $key -->\n";
+ wfProfileOut( $fname );
+ return $difftext;
+ }
+ }
+
+ if ( !$this->loadText() ) {
+ wfProfileOut( $fname );
+ return false;
+ }
+
+ $difftext = $this->generateDiffBody( $this->mOldtext, $this->mNewtext );
+
+ // Save to cache for 7 days
+ if ( $key !== false && $difftext !== false ) {
+ wfIncrStats( 'diff_cache_miss' );
+ $wgMemc->set( $key, $difftext, 7*86400 );
+ } else {
+ wfIncrStats( 'diff_uncacheable' );
+ }
+ // Replace line numbers with the text in the user's language
+ if ( $difftext !== false ) {
+ $difftext = $this->localiseLineNumbers( $difftext );
+ }
+ wfProfileOut( $fname );
+ return $difftext;
+ }
+
+ /**
+ * Generate a diff, no caching
+ * $otext and $ntext must be already segmented
+ */
+ function generateDiffBody( $otext, $ntext ) {
+ global $wgExternalDiffEngine, $wgContLang;
+ $fname = 'DifferenceEngine::generateDiffBody';
+
+ $otext = str_replace( "\r\n", "\n", $otext );
+ $ntext = str_replace( "\r\n", "\n", $ntext );
+
+ if ( $wgExternalDiffEngine == 'wikidiff' ) {
+ # For historical reasons, external diff engine expects
+ # input text to be HTML-escaped already
+ $otext = htmlspecialchars ( $wgContLang->segmentForDiff( $otext ) );
+ $ntext = htmlspecialchars ( $wgContLang->segmentForDiff( $ntext ) );
+ if( !function_exists( 'wikidiff_do_diff' ) ) {
+ dl('php_wikidiff.so');
+ }
+ return $wgContLang->unsegementForDiff( wikidiff_do_diff( $otext, $ntext, 2 ) );
+ }
+
+ if ( $wgExternalDiffEngine == 'wikidiff2' ) {
+ # Better external diff engine, the 2 may some day be dropped
+ # This one does the escaping and segmenting itself
+ if ( !function_exists( 'wikidiff2_do_diff' ) ) {
+ wfProfileIn( "$fname-dl" );
+ @dl('php_wikidiff2.so');
+ wfProfileOut( "$fname-dl" );
+ }
+ if ( function_exists( 'wikidiff2_do_diff' ) ) {
+ wfProfileIn( 'wikidiff2_do_diff' );
+ $text = wikidiff2_do_diff( $otext, $ntext, 2 );
+ wfProfileOut( 'wikidiff2_do_diff' );
+ return $text;
+ }
+ }
+ if ( $wgExternalDiffEngine !== false ) {
+ # Diff via the shell
+ global $wgTmpDirectory;
+ $tempName1 = tempnam( $wgTmpDirectory, 'diff_' );
+ $tempName2 = tempnam( $wgTmpDirectory, 'diff_' );
+
+ $tempFile1 = fopen( $tempName1, "w" );
+ if ( !$tempFile1 ) {
+ wfProfileOut( $fname );
+ return false;
+ }
+ $tempFile2 = fopen( $tempName2, "w" );
+ if ( !$tempFile2 ) {
+ wfProfileOut( $fname );
+ return false;
+ }
+ fwrite( $tempFile1, $otext );
+ fwrite( $tempFile2, $ntext );
+ fclose( $tempFile1 );
+ fclose( $tempFile2 );
+ $cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
+ wfProfileIn( "$fname-shellexec" );
+ $difftext = wfShellExec( $cmd );
+ wfProfileOut( "$fname-shellexec" );
+ unlink( $tempName1 );
+ unlink( $tempName2 );
+ return $difftext;
+ }
+
+ # Native PHP diff
+ $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
+ $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
+ $diffs = new Diff( $ota, $nta );
+ $formatter = new TableDiffFormatter();
+ return $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) );
+ }
+
+
+ /**
+ * Replace line numbers with the text in the user's language
+ */
+ function localiseLineNumbers( $text ) {
+ return preg_replace_callback( '/<!--LINE (\d+)-->/',
+ array( &$this, 'localiseLineNumbersCb' ), $text );
+ }
+
+ function localiseLineNumbersCb( $matches ) {
+ global $wgLang;
+ return wfMsgExt( 'lineno', array('parseinline'), $wgLang->formatNum( $matches[1] ) );
+ }
+
+ /**
+ * Add the header to a diff body
+ */
+ function addHeader( $diff, $otitle, $ntitle ) {