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<?PHP // $Id: filter.php,v 1.6 2004/08/08 06:57:44 moodler Exp $
//This function provides automatic linking to
//resources when its name (title) is found inside every Moodle text
//It's based in the glosssary filter by Williams Castillo
//Modifications by stronk7. Enjoy! :-)
function resource_filter($courseid, $text) {
global $CFG;
if (empty($courseid)) {
if ($site = get_site()) {
$courseid = $site->id;
}
}
switch ($CFG->dbtype) {
case 'postgres7':
$as = 'as';
break;
case 'mysql':
$as = '';
break;
}
///sorting by the lenght of the title in order to assure that large resources
///could be linked first, if they exist in the text to parse
switch ($CFG->dbtype) {
case "postgres7":
case "mysql":
$rbylenght = "CHAR_LENGTH(name) desc";
break;
default:
$rbylenght = "";
break;
}
$resources = get_records_select("resource", "course = $courseid", "$rbylenght");
if (!empty($resources)) {
$cm = '';
foreach ($resources as $resource) {
if (!$cm = get_coursemodule_from_instance("resource", $resource->id, $courseid)) {
$cm->id = 1;
}
$title = strip_tags($resource->name);
$href_tag_begin = "<a class=\"autolink\" title=\"$title\" href=\"$CFG->wwwroot/mod/resource/view.php?id=$cm->id\">";
$currentname = $resource->name;
if ($currentname = trim($currentname)) {
//Avoid integers < 1000 to be linked. See bug 1441.
$intcurrent = intval($currentname);
if (!(!empty($intcurrent) && strval($intcurrent) == $currentname && $intcurrent < 1000)) {
$text = resource_link_names($text,$currentname,$href_tag_begin, "</a>");
}
}
}
}
return $text;
}
function resource_link_names($text,$name,$href_tag_begin,$href_tag_end = "</a>") {
$list_of_words_cp = strip_tags($name);
$list_of_words_cp = trim($list_of_words_cp,'|');
$list_of_words_cp = trim($list_of_words_cp);
$list_of_words_cp = preg_quote($list_of_words_cp,'/');
$invalidprefixs = "([a-zA-Z0-9])";
$invalidsufixs = "([a-zA-Z0-9])";
//Avoid seaching in the string if it's inside invalidprefixs and invalidsufixs
$words = array();
$regexp = '/'.$invalidprefixs.'('.$list_of_words_cp.')|('.$list_of_words_cp.')'.$invalidsufixs.'/is';
preg_match_all($regexp,$text,$list_of_words);
foreach (array_unique($list_of_words[0]) as $key=>$value) {
$words['<*'.$key.'*>'] = $value;
}
if (!empty($words)) {
$text = str_replace($words,array_keys($words),$text);
}
//Now avoid searching inside the <nolink>tag
$excludes = array();
preg_match_all('/<nolink>(.+?)<\/nolink>/is',$text,$list_of_excludes);
foreach (array_unique($list_of_excludes[0]) as $key=>$value) {
$excludes['<+'.$key.'+>'] = $value;
}
if (!empty($excludes)) {
$text = str_replace($excludes,array_keys($excludes),$text);
}
//Now avoid searching inside links
$links = array();
preg_match_all('/<A[\s](.+?)>(.+?)<\/A>/is',$text,$list_of_links);
foreach (array_unique($list_of_links[0]) as $key=>$value) {
$links['<@'.$key.'@>'] = $value;
}
if (!empty($links)) {
$text = str_replace($links,array_keys($links),$text);
}
//Now avoid searching inside every tag
$final = array();
preg_match_all('/<(.+?)>/is',$text,$list_of_tags);
foreach (array_unique($list_of_tags[0]) as $key=>$value) {
$final['<|'.$key.'|>'] = $value;
}
if (!empty($final)) {
$text = str_replace($final,array_keys($final),$text);
}
$text = preg_replace('/('.$list_of_words_cp.')/is', $href_tag_begin.'$1'.$href_tag_end,$text);
//Now rebuild excluded areas
if (!empty($final)) {
$text = str_replace(array_keys($final),$final,$text);
}
if (!empty($links)) {
$text = str_replace(array_keys($links),$links,$text);
}
if (!empty($excludes)) {
$text = str_replace(array_keys($excludes),$excludes,$text);
}
if (!empty($words)) {
$text = str_replace(array_keys($words),$words,$text);
}
return $text;
}
?>
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