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<?php
/**
* WordPress Diff bastard child of old MediaWiki Diff Formatter.
*
* Basically all that remains is the table structure and some method names.
*
* @package WordPress
* @subpackage Diff
*/
if ( !class_exists( 'Text_Diff' ) ) {
/** Text_Diff class */
require( dirname(__FILE__).'/Text/Diff.php' );
/** Text_Diff_Renderer class */
require( dirname(__FILE__).'/Text/Diff/Renderer.php' );
/** Text_Diff_Renderer_inline class */
require( dirname(__FILE__).'/Text/Diff/Renderer/inline.php' );
}
/**
* 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 filter 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 backwards 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 backwards 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 backwards 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 backwards 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 );
}
}
}
/**
* Better word splitting than the PEAR package provides.
*
* @since 2.6.0
* @uses Text_Diff_Renderer_inline Extends
*/
class WP_Text_Diff_Renderer_inline extends Text_Diff_Renderer_inline {
/**
* @ignore
* @since 2.6.0
*
* @param string $string
* @param string $newlineEscape
* @return string
*/
public function _splitOnWords($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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