* @license https://www.gnu.org/licenses/gpl-3.0.en.html GNU General Public License V3
* @package IV
*/
require_once(__DIR__ . "/Helper.php");
/**
* HTML helper.
*
* Contains utilities to generate HTML content.
*
* @category Helper.
*/
final class HTML extends Helper{
/**
* This function closes all the opened HTML tags in a given string.
*
* @param string html The string with HTML tags.
* @return string HTML with closed tags.
*/
public static function close_tags($html) {
$result = [];
preg_match_all("#<(?!meta|img|br|hr|input\b)\b([a-z]+)(?: .*)?(?#iU", $html, $result);
$openedtags = $result[1];
preg_match_all("##iU", $html, $result);
$closedtags = $result[1];
$len_opened = count($openedtags);
if (count($closedtags) == $len_opened) {
return $html;
}
$openedtags = array_reverse($openedtags);
for ($i=0; $i < $len_opened; $i++) {
if (!in_array($openedtags[$i], $closedtags)) {
$html .= "";
} else {
unset($closedtags[array_search($openedtags[$i], $closedtags)]);
}
}
return $html;
}
/**
* Text shortener. Given a string, it trims in the proximity of the
* desired string, up to the next white character. If indicated, it will
* append a link to the full text.
*
* @param string $text The text to shorten.
* @param int $length The desired length.
* @param string $link_text Text for the link. Optional.
* @param string $link URI of the link.
* @return string Shortened text.
*/
function cut_text($text, $length, $link_text = "", $link = ""){
if (strlen($text) < $length){
return $text;
}
$cut = substr($text, 0, strpos($text, " ", $length));
$cut = close_tags($cut);
if (strlen($cut) == 0){
$cut = $text;
}
if (strlen($text) != strlen($cut) && strlen($link) > 0 && strlen($link_text) > 0){
$cut = $cut . "... $link_text";
}
return $cut;
}
/**
* Creates the srcset attribute for content images.
* Creates 9 different resolutions, from 100px to 900px.
*
* @param string $file Path to the file, relative to $path["img"]["content"]).
* @return string srcset atttribute content.
*/
public static function srcset($file){
$srcset = "";
$dir = dirname($file);
$name = basename($file);
foreach (range(1, 9) as $d) {
$srcset = $srcset . URL::IMG["CONTENT"] . $dir . "/x" . $d . "00/" . $name . " " . $d . "00px, ";
}
$srcset = rtrim($srcset, ", ");
return $srcset;
}
}