--- /dev/null
+<?php
+
+if ( !class_exists( 'Text_Diff' ) ) {
+ require( dirname(__FILE__).'/Text/Diff.php' );
+ require( dirname(__FILE__).'/Text/Diff/Renderer.php' );
+ require( dirname(__FILE__).'/Text/Diff/Renderer/inline.php' );
+}
+
+
+/* Descendent of a bastard child of piece of an old MediaWiki Diff Formatter
+ *
+ * Basically all that remains is the table structure and some method names.
+ */
+
+class WP_Text_Diff_Renderer_Table extends Text_Diff_Renderer {
+ var $_leading_context_lines = 10000;
+ var $_trailing_context_lines = 10000;
+ var $_diff_threshold = 0.6;
+
+ var $inline_diff_renderer = 'WP_Text_Diff_Renderer_inline';
+
+ function Text_Diff_Renderer_Table( $params = array() ) {
+ $parent = get_parent_class($this);
+ $this->$parent( $params );
+ }
+
+ function _startBlock( $header ) {
+ return '';
+ }
+
+ function _lines( $lines, $prefix=' ' ) {
+ }
+
+ // HTML-escape parameter before calling this
+ function addedLine( $line ) {
+ return "<td>+</td><td class='diff-addedline'>{$line}</td>";
+ }
+
+ // HTML-escape parameter before calling this
+ function deletedLine( $line ) {
+ return "<td>-</td><td class='diff-deletedline'>{$line}</td>";
+ }
+
+ // HTML-escape parameter before calling this
+ function contextLine( $line ) {
+ return "<td> </td><td class='diff-context'>{$line}</td>";
+ }
+
+ function emptyLine() {
+ return '<td colspan="2"> </td>';
+ }
+
+ function _added( $lines, $encode = true ) {
+ $r = '';
+ foreach ($lines as $line) {
+ if ( $encode )
+ $line = htmlspecialchars( $line );
+ $r .= '<tr>' . $this->emptyLine() . $this->addedLine( $line ) . "</tr>\n";
+ }
+ return $r;
+ }
+
+ function _deleted( $lines, $encode = true ) {
+ $r = '';
+ foreach ($lines as $line) {
+ if ( $encode )
+ $line = htmlspecialchars( $line );
+ $r .= '<tr>' . $this->deletedLine( $line ) . $this->emptyLine() . "</tr>\n";
+ }
+ return $r;
+ }
+
+ function _context( $lines, $encode = true ) {
+ $r = '';
+ foreach ($lines as $line) {
+ if ( $encode )
+ $line = htmlspecialchars( $line );
+ $r .= '<tr>' .
+ $this->contextLine( $line ) . $this->contextLine( $line ) . "</tr>\n";
+ }
+ return $r;
+ }
+
+ // Process changed lines to do word-by-word diffs for extra highlighting (TRAC style)
+ // sometimes these lines can actually be deleted or added rows - we do additional processing
+ // to figure that out
+ function _changed( $orig, $final ) {
+ $r = '';
+
+ // Does the aforementioned additional processing
+ // *_matches tell what rows are "the same" in orig and final. Those pairs will be diffed to get word changes
+ // match is numeric: an index in other column
+ // match is 'X': no match. It is a new row
+ // *_rows are column vectors for the orig column and the final column.
+ // row >= 0: an indix of the $orig or $final array
+ // row < 0: a blank row for that column
+ list($orig_matches, $final_matches, $orig_rows, $final_rows) = $this->interleave_changed_lines( $orig, $final );
+
+
+ // These will hold the word changes as determined by an inline diff
+ $orig_diffs = array();
+ $final_diffs = array();
+
+ // Compute word diffs for each matched pair using the inline diff
+ foreach ( $orig_matches as $o => $f ) {
+ if ( is_numeric($o) && is_numeric($f) ) {
+ $text_diff = new Text_Diff( 'auto', array( array($orig[$o]), array($final[$f]) ) );
+ $renderer = new $this->inline_diff_renderer;
+ $diff = $renderer->render( $text_diff );
+
+ // If they're too different, don't include any <ins> or <dels>
+ if ( $diff_count = preg_match_all( '!(<ins>.*?</ins>|<del>.*?</del>)!', $diff, $diff_matches ) ) {
+ // length of all text between <ins> or <del>
+ $stripped_matches = strlen(strip_tags( join(' ', $diff_matches[0]) ));
+ // since we count lengith of text between <ins> or <del> (instead of picking just one),
+ // we double the length of chars not in those tags.
+ $stripped_diff = strlen(strip_tags( $diff )) * 2 - $stripped_matches;
+ $diff_ratio = $stripped_matches / $stripped_diff;
+ if ( $diff_ratio > $this->_diff_threshold )
+ continue; // Too different. Don't save diffs.
+ }
+
+ // Un-inline the diffs by removing del or ins
+ $orig_diffs[$o] = preg_replace( '|<ins>.*?</ins>|', '', $diff );
+ $final_diffs[$f] = preg_replace( '|<del>.*?</del>|', '', $diff );
+ }
+ }
+
+ foreach ( array_keys($orig_rows) as $row ) {
+ // Both columns have blanks. Ignore them.
+ if ( $orig_rows[$row] < 0 && $final_rows[$row] < 0 )
+ continue;
+
+ // If we have a word based diff, use it. Otherwise, use the normal line.
+ $orig_line = isset($orig_diffs[$orig_rows[$row]])
+ ? $orig_diffs[$orig_rows[$row]]
+ : htmlspecialchars($orig[$orig_rows[$row]]);
+ $final_line = isset($final_diffs[$final_rows[$row]])
+ ? $final_diffs[$final_rows[$row]]
+ : htmlspecialchars($final[$final_rows[$row]]);
+
+ if ( $orig_rows[$row] < 0 ) { // Orig is blank. This is really an added row.
+ $r .= $this->_added( array($final_line), false );
+ } elseif ( $final_rows[$row] < 0 ) { // Final is blank. This is really a deleted row.
+ $r .= $this->_deleted( array($orig_line), false );
+ } else { // A true changed row.
+ $r .= '<tr>' . $this->deletedLine( $orig_line ) . $this->addedLine( $final_line ) . "</tr>\n";
+ }
+ }
+
+ return $r;
+ }
+
+ // Takes changed blocks and matches which rows in orig turned into which rows in final.
+ // Returns
+ // *_matches ( which rows match with which )
+ // *_rows ( order of rows in each column interleaved with blank rows as necessary )
+ function interleave_changed_lines( $orig, $final ) {
+
+ // Contains all pairwise string comparisons. Keys are such that this need only be a one dimensional array.
+ $matches = array();
+ foreach ( array_keys($orig) as $o ) {
+ foreach ( array_keys($final) as $f ) {
+ $matches["$o,$f"] = $this->compute_string_distance( $orig[$o], $final[$f] );
+ }
+ }
+ asort($matches); // Order by string distance.
+
+ $orig_matches = array();
+ $final_matches = array();
+
+ foreach ( $matches as $keys => $difference ) {
+ list($o, $f) = explode(',', $keys);
+ $o = (int) $o;
+ $f = (int) $f;
+
+ // Already have better matches for these guys
+ if ( isset($orig_matches[$o]) && isset($final_matches[$f]) )
+ continue;
+
+ // First match for these guys. Must be best match
+ if ( !isset($orig_matches[$o]) && !isset($final_matches[$f]) ) {
+ $orig_matches[$o] = $f;
+ $final_matches[$f] = $o;
+ continue;
+ }
+
+ // Best match of this final is already taken? Must mean this final is a new row.
+ if ( isset($orig_matches[$o]) )
+ $final_matches[$f] = 'x';
+
+ // Best match of this orig is already taken? Must mean this orig is a deleted row.
+ elseif ( isset($final_matches[$f]) )
+ $orig_matches[$o] = 'x';
+ }
+
+ // We read the text in this order
+ ksort($orig_matches);
+ ksort($final_matches);
+
+
+ // Stores rows and blanks for each column.
+ $orig_rows = $orig_rows_copy = array_keys($orig_matches);
+ $final_rows = array_keys($final_matches);
+
+ // Interleaves rows with blanks to keep matches aligned.
+ // We may end up with some extraneous blank rows, but we'll just ignore them later.
+ foreach ( $orig_rows_copy as $orig_row ) {
+ $final_pos = array_search($orig_matches[$orig_row], $final_rows, true);
+ $orig_pos = (int) array_search($orig_row, $orig_rows, true);
+
+ if ( false === $final_pos ) { // This orig is paired with a blank final.
+ array_splice( $final_rows, $orig_pos, 0, -1 );
+ } elseif ( $final_pos < $orig_pos ) { // This orig's match is up a ways. Pad final with blank rows.
+ $diff_pos = $final_pos - $orig_pos;
+ while ( $diff_pos < 0 )
+ array_splice( $final_rows, $orig_pos, 0, $diff_pos++ );
+ } elseif ( $final_pos > $orig_pos ) { // This orig's match is down a ways. Pad orig with blank rows.
+ $diff_pos = $orig_pos - $final_pos;
+ while ( $diff_pos < 0 )
+ array_splice( $orig_rows, $orig_pos, 0, $diff_pos++ );
+ }
+ }
+
+
+ // Pad the ends with blank rows if the columns aren't the same length
+ $diff_count = count($orig_rows) - count($final_rows);
+ if ( $diff_count < 0 ) {
+ while ( $diff_count < 0 )
+ array_push($orig_rows, $diff_count++);
+ } elseif ( $diff_count > 0 ) {
+ $diff_count = -1 * $diff_count;
+ while ( $diff_count < 0 )
+ array_push($final_rows, $diff_count++);
+ }
+
+ return array($orig_matches, $final_matches, $orig_rows, $final_rows);
+
+/*
+ // Debug
+ echo "\n\n\n\n\n";
+
+ echo "-- DEBUG Matches: Orig -> Final --";
+
+ foreach ( $orig_matches as $o => $f ) {
+ echo "\n\n\n\n\n";
+ echo "ORIG: $o, FINAL: $f\n";
+ var_dump($orig[$o],$final[$f]);
+ }
+ echo "\n\n\n\n\n";
+
+ echo "-- DEBUG Matches: Final -> Orig --";
+
+ foreach ( $final_matches as $f => $o ) {
+ echo "\n\n\n\n\n";
+ echo "FINAL: $f, ORIG: $o\n";
+ var_dump($final[$f],$orig[$o]);
+ }
+ echo "\n\n\n\n\n";
+
+ echo "-- DEBUG Rows: Orig -- Final --";
+
+ echo "\n\n\n\n\n";
+ foreach ( $orig_rows as $row => $o ) {
+ if ( $o < 0 )
+ $o = 'X';
+ $f = $final_rows[$row];
+ if ( $f < 0 )
+ $f = 'X';
+ echo "$o -- $f\n";
+ }
+ echo "\n\n\n\n\n";
+
+ echo "-- END DEBUG --";
+
+ echo "\n\n\n\n\n";
+
+ return array($orig_matches, $final_matches, $orig_rows, $final_rows);
+*/
+ }
+
+
+ // Computes a number that is intended to reflect the "distance" between two strings.
+ function compute_string_distance( $string1, $string2 ) {
+ // Vectors containing character frequency for all chars in each string
+ $chars1 = count_chars($string1);
+ $chars2 = count_chars($string2);
+
+ // L1-norm of difference vector.
+ $difference = array_sum( array_map( array(&$this, 'difference'), $chars1, $chars2 ) );
+
+ // $string1 has zero length? Odd. Give huge penalty by not dividing.
+ if ( !$string1 )
+ return $difference;
+
+ // Return distance per charcter (of string1)
+ return $difference / strlen($string1);
+ }
+
+ function difference( $a, $b ) {
+ return abs( $a - $b );
+ }
+
+}
+
+// Better word splitting than the PEAR package provides
+class WP_Text_Diff_Renderer_inline extends Text_Diff_Renderer_inline {
+
+ function _splitOnWords($string, $newlineEscape = "\n") {
+ $string = str_replace("\0", '', $string);
+ $words = preg_split( '/([^\w])/u', $string, -1, PREG_SPLIT_DELIM_CAPTURE );
+ $words = str_replace( "\n", $newlineEscape, $words );
+ return $words;
+ }
+
+}
+
+?>
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