475 lines
12 KiB
PHP
475 lines
12 KiB
PHP
<?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 protected
|
|
* @since 2.6.0
|
|
*/
|
|
var $_leading_context_lines = 10000;
|
|
|
|
/**
|
|
* @see Text_Diff_Renderer::_trailing_context_lines
|
|
* @var int
|
|
* @access protected
|
|
* @since 2.6.0
|
|
*/
|
|
var $_trailing_context_lines = 10000;
|
|
|
|
/**
|
|
* {@internal Missing Description}}
|
|
*
|
|
* @var float
|
|
* @access protected
|
|
* @since 2.6.0
|
|
*/
|
|
var $_diff_threshold = 0.6;
|
|
|
|
/**
|
|
* Inline display helper object name.
|
|
*
|
|
* @var string
|
|
* @access protected
|
|
* @since 2.6.0
|
|
*/
|
|
var $inline_diff_renderer = 'WP_Text_Diff_Renderer_inline';
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
function __construct( $params = array() ) {
|
|
parent::__construct( $params );
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
*
|
|
* @param string $header
|
|
* @return string
|
|
*/
|
|
function _startBlock( $header ) {
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
*
|
|
* @param array $lines
|
|
* @param string $prefix
|
|
*/
|
|
function _lines( $lines, $prefix=' ' ) {
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
*
|
|
* @param string $line HTML-escape the value.
|
|
* @return string
|
|
*/
|
|
function addedLine( $line ) {
|
|
return "<td>+</td><td class='diff-addedline'>{$line}</td>";
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
*
|
|
* @param string $line HTML-escape the value.
|
|
* @return string
|
|
*/
|
|
function deletedLine( $line ) {
|
|
return "<td>-</td><td class='diff-deletedline'>{$line}</td>";
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
*
|
|
* @param string $line HTML-escape the value.
|
|
* @return string
|
|
*/
|
|
function contextLine( $line ) {
|
|
return "<td> </td><td class='diff-context'>{$line}</td>";
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
*
|
|
* @return string
|
|
*/
|
|
function emptyLine() {
|
|
return '<td colspan="2"> </td>';
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
* @access private
|
|
*
|
|
* @param array $lines
|
|
* @param bool $encode
|
|
* @return string
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
* @access private
|
|
*
|
|
* @param array $lines
|
|
* @param bool $encode
|
|
* @return string
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
* @access private
|
|
*
|
|
* @param array $lines
|
|
* @param bool $encode
|
|
* @return string
|
|
*/
|
|
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
|
|
*
|
|
* @access private
|
|
* @since 2.6.0
|
|
*
|
|
* @param array $orig
|
|
* @param array $final
|
|
* @return string
|
|
*/
|
|
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.
|
|
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.
|
|
$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 )
|
|
*
|
|
* @since 2.6.0
|
|
*
|
|
* @param unknown_type $orig
|
|
* @param unknown_type $final
|
|
* @return unknown
|
|
*/
|
|
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.
|
|
*
|
|
* @since 2.6.0
|
|
*
|
|
* @param string $string1
|
|
* @param string $string2
|
|
* @return int
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* @ignore
|
|
* @since 2.6.0
|
|
*
|
|
* @param int $a
|
|
* @param int $b
|
|
* @return int
|
|
*/
|
|
function difference( $a, $b ) {
|
|
return abs( $a - $b );
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* 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 $newlineEscape
|
|
* @return string
|
|
*/
|
|
function _splitOnWords($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;
|
|
}
|
|
|
|
}
|
|
|
|
?>
|