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By default, diffs are processed with * htmlspecialchars. Use this filter to remove or change the processing. Passes a context * indicating if the line is added, deleted or unchanged. * * @since 4.1.0 * * @param String $processed_line The processed diffed line. * @param String $line The unprocessed diffed line. * @param string null The line context. Values are 'added', 'deleted' or 'unchanged'. */ $line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'added' ); } if ( $this->_show_split_view ) { $r .= '' . $this->emptyLine() . $this->emptyLine() . $this->addedLine( $line ) . "\n"; } else { $r .= '' . $this->addedLine( $line ) . "\n"; } } return $r; } /** * @ignore * * @param array $lines * @param bool $encode * @return string */ public function _deleted( $lines, $encode = true ) { $r = ''; foreach ($lines as $line) { if ( $encode ) { $processed_line = htmlspecialchars( $line ); /** This filter is documented in wp-includes/wp-diff.php */ $line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'deleted' ); } if ( $this->_show_split_view ) { $r .= '' . $this->deletedLine( $line ) . $this->emptyLine() . $this->emptyLine() . "\n"; } else { $r .= '' . $this->deletedLine( $line ) . "\n"; } } return $r; } /** * @ignore * * @param array $lines * @param bool $encode * @return string */ public function _context( $lines, $encode = true ) { $r = ''; foreach ($lines as $line) { if ( $encode ) { $processed_line = htmlspecialchars( $line ); /** This filter is documented in wp-includes/wp-diff.php */ $line = apply_filters( 'process_text_diff_html', $processed_line, $line, 'unchanged' ); } if ( $this->_show_split_view ) { $r .= '' . $this->contextLine( $line ) . $this->emptyLine() . $this->contextLine( $line ) . "\n"; } else { $r .= '' . $this->contextLine( $line ) . "\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 * * @since 2.6.0 * * @param array $orig * @param array $final * @return string */ public 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 or if ( preg_match_all( '!(.*?|.*?)!', $diff, $diff_matches ) ) { // length of all text between or $stripped_matches = strlen(strip_tags( join(' ', $diff_matches[0]) )); // since we count lengith of text between or (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( '|.*?|', '', $diff ); $final_diffs[$f] = preg_replace( '|.*?|', '', $diff ); } } foreach ( array_keys($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. if ( isset( $orig_diffs[$orig_rows[$row]] ) ) $orig_line = $orig_diffs[$orig_rows[$row]]; elseif ( isset( $orig[$orig_rows[$row]] ) ) $orig_line = htmlspecialchars($orig[$orig_rows[$row]]); else $orig_line = ''; if ( isset( $final_diffs[$final_rows[$row]] ) ) $final_line = $final_diffs[$final_rows[$row]]; elseif ( isset( $final[$final_rows[$row]] ) ) $final_line = htmlspecialchars($final[$final_rows[$row]]); else $final_line = ''; 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. if ( $this->_show_split_view ) { $r .= '' . $this->deletedLine( $orig_line ) . $this->emptyLine() . $this->addedLine( $final_line ) . "\n"; } else { $r .= '' . $this->deletedLine( $orig_line ) . "" . $this->addedLine( $final_line ) . "\n"; } } } return $r; } /** * Takes changed blocks and matches which rows in orig turned into which rows in final. * * @since 2.6.0 * * @param array $orig Lines of the original version of the text. * @param array $final Lines of the final version of the text. * @return array { * Array containing results of comparing the original text to the final text. * * @type array $orig_matches Associative array of original matches. Index == row * number of `$orig`, value == corresponding row number * of that same line in `$final` or 'x' if there is no * corresponding row (indicating it is a deleted line). * @type array $final_matches Associative array of final matches. Index == row * number of `$final`, value == corresponding row number * of that same line in `$orig` or 'x' if there is no * corresponding row (indicating it is a new line). * @type array $orig_rows Associative array of interleaved rows of `$orig` with * blanks to keep matches aligned with side-by-side diff * of `$final`. A value >= 0 corresponds to index of `$orig`. * Value < 0 indicates a blank row. * @type array $final_rows Associative array of interleaved rows of `$final` with * blanks to keep matches aligned with side-by-side diff * of `$orig`. A value >= 0 corresponds to index of `$final`. * Value < 0 indicates a blank row. * } */ public 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); } /** * Computes a number that is intended to reflect the "distance" between two strings. * * @since 2.6.0 * * @param string $string1 * @param string $string2 * @return int */ public 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 character (of string1). return $difference / strlen($string1); } /** * @ignore * @since 2.6.0 * * @param int $a * @param int $b * @return int */ public function difference( $a, $b ) { return abs( $a - $b ); } /** * Make private properties readable for backward compatibility. * * @since 4.0.0 * * @param string $name Property to get. * @return mixed Property. */ public function __get( $name ) { if ( in_array( $name, $this->compat_fields ) ) { return $this->$name; } } /** * Make private properties settable for backward compatibility. * * @since 4.0.0 * * @param string $name Property to check if set. * @param mixed $value Property value. * @return mixed Newly-set property. */ public function __set( $name, $value ) { if ( in_array( $name, $this->compat_fields ) ) { return $this->$name = $value; } } /** * Make private properties checkable for backward compatibility. * * @since 4.0.0 * * @param string $name Property to check if set. * @return bool Whether the property is set. */ public function __isset( $name ) { if ( in_array( $name, $this->compat_fields ) ) { return isset( $this->$name ); } } /** * Make private properties un-settable for backward compatibility. * * @since 4.0.0 * * @param string $name Property to unset. */ public function __unset( $name ) { if ( in_array( $name, $this->compat_fields ) ) { unset( $this->$name ); } } }