/**
* Compares to revisions of the page
*
* @param int $a_left Nr of first revision
* @param int $a_right Nr of second revision
*/
function compareVersion($a_left, $a_right)
{
global $ilDB;
// get page objects
$l_page = new ilPageObject($this->getParentType(), $this->getId(), $a_left);
$r_page = new ilPageObject($this->getParentType(), $this->getId(), $a_right);
$l_hashes = $l_page->getPageContentsHashes();
$r_hashes = $r_page->getPageContentsHashes();
// determine all deleted and changed page elements
foreach ($l_hashes as $pc_id => $h) {
if (!isset($r_hashes[$pc_id])) {
$l_hashes[$pc_id]["change"] = "Deleted";
} else {
if ($l_hashes[$pc_id]["hash"] != $r_hashes[$pc_id]["hash"]) {
$l_hashes[$pc_id]["change"] = "Modified";
$r_hashes[$pc_id]["change"] = "Modified";
include_once "./Services/COPage/mediawikidiff/class.WordLevelDiff.php";
// if modified element is a paragraph, highlight changes
if ($l_hashes[$pc_id]["content"] != "" && $r_hashes[$pc_id]["content"] != "") {
$new_left = str_replace("\n", "<br />", $l_hashes[$pc_id]["content"]);
$new_right = str_replace("\n", "<br />", $r_hashes[$pc_id]["content"]);
$wldiff = new WordLevelDiff(array($new_left), array($new_right));
$new_left = $wldiff->orig();
$new_right = $wldiff->closing();
$l_page->setParagraphContent($l_hashes[$pc_id]["hier_id"], $new_left[0]);
$r_page->setParagraphContent($l_hashes[$pc_id]["hier_id"], $new_right[0]);
}
}
}
}
// determine all new paragraphs
foreach ($r_hashes as $pc_id => $h) {
if (!isset($l_hashes[$pc_id])) {
$r_hashes[$pc_id]["change"] = "New";
}
}
$l_page->addChangeDivClasses($l_hashes);
$r_page->addChangeDivClasses($r_hashes);
return array("l_page" => $l_page, "r_page" => $r_page, "l_changes" => $l_hashes, "r_changes" => $r_hashes);
}
