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<?php
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/**
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* CLAROLINE.
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*
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* @version 1.7 $Revision: 1.12 $
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*
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* @copyright 2001-2005 Universite catholique de Louvain (UCL)
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* @license http://www.gnu.org/copyleft/gpl.html (GPL) GENERAL PUBLIC LICENSE
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* This program is under the terms of the GENERAL PUBLIC LICENSE (GPL)
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* as published by the FREE SOFTWARE FOUNDATION. The GPL is available
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* through the world-wide-web at http://www.gnu.org/copyleft/gpl.html
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* @author Frederic Minne <zefredz@gmail.com>
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*/
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define("DIFF_EQUAL", "=");
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define("DIFF_ADDED", "+");
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define("DIFF_DELETED", "-");
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define("DIFF_MOVED", "M");
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/**
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* Get difference between two strings.
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*
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* @param string old first string
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* @param string new second string
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* @param bool show_equals set to true to see line that are equal between
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* the two strings (default true)
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* @param string format_line_function callback function to format line
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* (default 'format_line')
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*
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* @return string formated diff output
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*/
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function diff(
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$old,
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$new,
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$show_equals = false,
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$format_line_function = 'format_line'
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) {
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$oldArr = str_split_on_new_line($old);
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$newArr = str_split_on_new_line($new);
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$oldCount = count($oldArr);
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$newCount = count($newArr);
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$max = max($oldCount, $newCount);
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//get added and deleted lines
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$deleted = array_diff_assoc($oldArr, $newArr);
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$added = array_diff_assoc($newArr, $oldArr);
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$moved = [];
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foreach ($added as $key => $candidate) {
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foreach ($deleted as $index => $content) {
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if ($candidate == $content) {
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$moved[$key] = $candidate;
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unset($added[$key]);
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unset($deleted[$index]);
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break;
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}
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}
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}
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$output = '';
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for ($i = 0; $i < $max; $i++) {
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// line changed
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if (isset($deleted[$i]) && isset($added[$i])) {
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$output .= $format_line_function($i, DIFF_DELETED, $deleted[$i]);
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$output .= $format_line_function($i, DIFF_ADDED, $added[$i]);
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} elseif (isset($deleted[$i]) && !isset($added[$i])) {
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// line deleted
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$output .= $format_line_function($i, DIFF_DELETED, $deleted[$i]);
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} elseif (isset($added[$i]) && !isset($deleted[$i])) {
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// line added
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$output .= $format_line_function($i, DIFF_ADDED, $added[$i]);
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} elseif (isset($moved[$i])) {
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// line moved
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$output .= $format_line_function($i, DIFF_MOVED, $newArr[$i]);
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} elseif ($show_equals) {
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// line unchanged
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$output .= $format_line_function($i, DIFF_EQUAL, $newArr[$i]);
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}
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}
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return $output;
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}
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/**
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* Split strings on new line.
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*/
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function str_split_on_new_line($str)
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{
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$content = [];
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if (false !== api_strpos($str, "\r\n")) {
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$content = explode("\r\n", $str);
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} elseif (false !== api_strpos($str, "\n")) {
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$content = explode("\n", $str);
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} elseif (false !== api_strpos($str, "\r")) {
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$content = explode("\r", $str);
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} else {
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$content[] = $str;
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}
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return $content;
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}
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/**
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* Default and prototype format line function.
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*
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* @param int line line number
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* @param mixed type line type, must be one of the following :
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* DIFF_EQUAL, DIFF_MOVED, DIFF_ADDED, DIFF_DELETED
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* @param string value line content
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* @param bool skip_empty skip empty lines (default false)
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*
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* @return string formated diff line
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*/
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function format_line($line, $type, $value, $skip_empty = false)
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{
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if ("" == trim($value) && $skip_empty) {
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return "";
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} elseif ("" == trim($value)) {
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$value = ' ';
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}
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switch ($type) {
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case DIFF_EQUAL:
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// return $line. ' : ' . ' = <span class="diffEqual" >' . $value . '</span><br />' . "\n" ;
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return '<span class="diffEqual" >'.$value.'</span><br />'."\n"; //juan carlos muestra solo color
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break;
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case DIFF_MOVED:
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//return $line. ' : ' . ' M <span class="diffMoved" >' . $value . '</span><br />' . "\n" ; //juan carlos ra<EFBFBD>a la sustitye la inverior
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return '<span class="diffMoved" >'.$value.'</span><br />'."\n"; //juan carlos muestra solo color
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break;
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case DIFF_ADDED:
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//return $line . ' : ' . ' + <span class="diffAdded" >' . $value . '</span><br />' . "\n" ;
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return '<span class="diffAdded" >'.$value.'</span><br />'."\n"; //juan carlos muestra solo color
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break;
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case DIFF_DELETED:
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//return $line . ' : ' . ' - <span class="diffDeleted" >' . $value . '</span><br />' . "\n" ; //juan carlos ra<EFBFBD>a la sustitye la inverior
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return '<span class="diffDeleted" >'.$value.'</span><br />'."\n"; //juan carlos muestra solo color
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break;
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}
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}
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/**
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* Table format line function.
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*
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* @see format_line
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*/
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function format_table_line($line, $type, $value, $skip_empty = false)
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{
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if ("" == trim($value) && $skip_empty) {
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return "";
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} elseif ("" == trim($value)) {
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$value = ' ';
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}
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switch ($type) {
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case DIFF_EQUAL:
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return '<tr><td></td><td bgcolor="#FFFFFF">'.$value.'</td></tr>'."\n";
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//juan carlos muestra solo color (no tambi<EFBFBD>n la l<EFBFBD>nea).
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// Adem<EFBFBD>s EN IEXPLORER VA BIEN PERO EN FIREFOX 3 la etiqueta span no muestra el color de fondo que
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// est<EFBFBD> definido en la hoja de estilos como background-color, aceptando s<EFBFBD>lo la propiedad color
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// pero esta solo da color al texto con lo cual los cambios quedan poco resaltados, adem<EFBFBD>s
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// los cambios de otros objetos que no sean texto no se indican por ej. a<EFBFBD>adir una imagen,
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// por esta raz<EFBFBD>n doy el color de fondo al td directamente.
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break;
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case DIFF_MOVED:
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return '<tr><td></td><td bgcolor="#FFFFAA">'.$value.'</td></tr>'."\n";
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//juan carlos muestra solo color (no tambi<EFBFBD>n la l<EFBFBD>nea). Adem<EFBFBD>s EN IEXPLORER VA BIEN PERO EN FIREFOX 3
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// la etiqueta span no muestra el color de fondo que est<EFBFBD> definido en la hoja de estilos como
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// background-color, aceptando s<EFBFBD>lo la propiedad color pero esta solo da color al texto con lo cual
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// los cambios quedan poco resaltados, adem<EFBFBD>s los cambios de otros objetos que no sean texto no se indican
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// por ej. a<EFBFBD>adir una imagen, por esta raz<EFBFBD>n doy el color de fondo al td directamente.
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break;
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case DIFF_ADDED:
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return '<tr><td></td><td bgcolor="#CCFFCC">'.$value.'</td></tr>'."\n";
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//juan carlos muestra solo color (no tambi<EFBFBD>n la l<EFBFBD>nea). Adem<EFBFBD>s EN IEXPLORER VA BIEN
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// PERO EN FIREFOX 3 la etiqueta span no muestra el color de fondo que est<EFBFBD> definido en la
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// hoja de estilos como background-color, aceptando s<EFBFBD>lo la propiedad color pero esta solo
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// da color al texto con lo cual los cambios quedan poco resaltados, adem<EFBFBD>s los cambios de
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// otros objetos que no sean texto no se indican por ej. a<EFBFBD>adir una imagen, por esta raz<EFBFBD>n
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// doy el color de fondo al td directamente.
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break;
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case DIFF_DELETED:
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return '<tr><td></td><td bgcolor="#FFAAAA">'.$value.'</td></tr>'."\n";
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//juan carlos muestra solo color (no tambi<EFBFBD>n la l<EFBFBD>nea). Adem<EFBFBD>s EN IEXPLORER VA BIEN PERO EN FIREFOX 3
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// la etiqueta span no muestra el color de fondo que est<EFBFBD> definido en la hoja de estilos como background-color,
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// aceptando s<EFBFBD>lo la propiedad color pero esta solo da color al texto con lo cual los cambios quedan poco
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// resaltados, adem<EFBFBD>s los cambios de otros objetos que no sean texto no se indican por ej. a<EFBFBD>adir una imagen,
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// por esta raz<EFBFBD>n doy el color de fondo al td directamente.
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}
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}
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