--- /dev/null
+<?php
+/**
+ * Diff API: WP_Text_Diff_Renderer_Table class
+ *
+ * @package WordPress
+ * @subpackage Diff
+ * @since 4.7.0
+ */
+
+/**
+ * Table renderer to display the diff lines.
+ *
+ * @since 2.6.0
+ * @uses Text_Diff_Renderer Extends
+ */
+class WP_Text_Diff_Renderer_Table extends Text_Diff_Renderer {
+
+ /**
+ * @see Text_Diff_Renderer::_leading_context_lines
+ * @var int
+ * @access public
+ * @since 2.6.0
+ */
+ public $_leading_context_lines = 10000;
+
+ /**
+ * @see Text_Diff_Renderer::_trailing_context_lines
+ * @var int
+ * @access public
+ * @since 2.6.0
+ */
+ public $_trailing_context_lines = 10000;
+
+ /**
+ * Threshold for when a diff should be saved or omitted.
+ *
+ * @var float
+ * @access protected
+ * @since 2.6.0
+ */
+ protected $_diff_threshold = 0.6;
+
+ /**
+ * Inline display helper object name.
+ *
+ * @var string
+ * @access protected
+ * @since 2.6.0
+ */
+ protected $inline_diff_renderer = 'WP_Text_Diff_Renderer_inline';
+
+ /**
+ * Should we show the split view or not
+ *
+ * @var string
+ * @access protected
+ * @since 3.6.0
+ */
+ protected $_show_split_view = true;
+
+ protected $compat_fields = array( '_show_split_view', 'inline_diff_renderer', '_diff_threshold' );
+
+ /**
+ * Constructor - Call parent constructor with params array.
+ *
+ * This will set class properties based on the key value pairs in the array.
+ *
+ * @since 2.6.0
+ *
+ * @param array $params
+ */
+ public function __construct( $params = array() ) {
+ parent::__construct( $params );
+ if ( isset( $params[ 'show_split_view' ] ) )
+ $this->_show_split_view = $params[ 'show_split_view' ];
+ }
+
+ /**
+ * @ignore
+ *
+ * @param string $header
+ * @return string
+ */
+ public function _startBlock( $header ) {
+ return '';
+ }
+
+ /**
+ * @ignore
+ *
+ * @param array $lines
+ * @param string $prefix
+ */
+ public function _lines( $lines, $prefix=' ' ) {
+ }
+
+ /**
+ * @ignore
+ *
+ * @param string $line HTML-escape the value.
+ * @return string
+ */
+ public function addedLine( $line ) {
+ return "<td class='diff-addedline'>{$line}</td>";
+
+ }
+
+ /**
+ * @ignore
+ *
+ * @param string $line HTML-escape the value.
+ * @return string
+ */
+ public function deletedLine( $line ) {
+ return "<td class='diff-deletedline'>{$line}</td>";
+ }
+
+ /**
+ * @ignore
+ *
+ * @param string $line HTML-escape the value.
+ * @return string
+ */
+ public function contextLine( $line ) {
+ return "<td class='diff-context'>{$line}</td>";
+ }
+
+ /**
+ * @ignore
+ *
+ * @return string
+ */
+ public function emptyLine() {
+ return '<td> </td>';
+ }
+
+ /**
+ * @ignore
+ * @access public
+ *
+ * @param array $lines
+ * @param bool $encode
+ * @return string
+ */
+ public function _added( $lines, $encode = true ) {
+ $r = '';
+ foreach ($lines as $line) {
+ if ( $encode ) {
+ $processed_line = htmlspecialchars( $line );
+
+ /**
+ * Contextually filters a diffed line.
+ *
+ * Filters TextDiff processing of diffed line. 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 .= '<tr>' . $this->emptyLine() . $this->emptyLine() . $this->addedLine( $line ) . "</tr>\n";
+ } else {
+ $r .= '<tr>' . $this->addedLine( $line ) . "</tr>\n";
+ }
+ }
+ return $r;
+ }
+
+ /**
+ * @ignore
+ * @access public
+ *
+ * @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 .= '<tr>' . $this->deletedLine( $line ) . $this->emptyLine() . $this->emptyLine() . "</tr>\n";
+ } else {
+ $r .= '<tr>' . $this->deletedLine( $line ) . "</tr>\n";
+ }
+
+ }
+ return $r;
+ }
+
+ /**
+ * @ignore
+ * @access public
+ *
+ * @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 .= '<tr>' . $this->contextLine( $line ) . $this->emptyLine() . $this->contextLine( $line ) . "</tr>\n";
+ } else {
+ $r .= '<tr>' . $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
+ *
+ * @access public
+ * @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 <ins> or <dels>
+ if ( 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.
+ 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 .= '<tr>' . $this->deletedLine( $orig_line ) . $this->emptyLine() . $this->addedLine( $final_line ) . "</tr>\n";
+ } else {
+ $r .= '<tr>' . $this->deletedLine( $orig_line ) . "</tr><tr>" . $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 )
+ *
+ * @since 2.6.0
+ *
+ * @param array $orig
+ * @param array $final
+ * @return array
+ */
+ 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
+ * @access public
+ *
+ * @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
+ * @access public
+ *
+ * @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
+ * @access public
+ *
+ * @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
+ * @access public
+ *
+ * @param string $name Property to unset.
+ */
+ public function __unset( $name ) {
+ if ( in_array( $name, $this->compat_fields ) ) {
+ unset( $this->$name );
+ }
+ }
+}
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