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<?php
/**
* Display and modify breadcrumbs
*
* This file is part of Zoph.
*
* Zoph is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Zoph is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Zoph; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @package Zoph
* @author Jason Geiger
* @author Jeroen Roos
*/
use template\block;
class breadcrumb {
/** @var array Current breadcrumbs */
private static $crumbs=array();
private static $actions=array("", "display", "search", "notify", "compose", "new", "users", "comments", "groups", "sets", "pages", "pagesets");
/**
* Create a crumb
* @param string title
* @param string url
*/
public function __construct(private string $title, private string $url) {
}
/**
* Create a crumb
* Crumbs are the path a user followed through Zoph's web GUI and can be
* used to easily go back to an earlier visited page
* only add a crumb if a title was set and if there is either no
* action or a safe action ("edit", "delete", etc would be unsafe)
* @param string title
* @param string action (display, edit, delete, etc.)
* @todo calls $_SERVER directly
*/
public static function create($title, $action = "") {
if (is_null($action)) {
$action = "";
}
$user=user::getCurrent();
$url=htmlentities($_SERVER["REQUEST_URI"]);
$page=array_reverse(explode("/", $_SERVER['PHP_SELF']));
$page=$page[0];
$allowed = ((in_array($action, self::$actions, true)) ||
($user?->prefs->get("auto_edit") && $page == "photo.php" && $action == "edit"));
$numCrumbs = count(static::$crumbs);
if (isset($title) && $numCrumbs < 100 && $allowed && ($numCrumbs == 0 || (!strpos($url, "_crumb=")))) {
// if title is the same remove last and add new
if ($numCrumbs > 0 && static::getLast()->getTitle()==$title) {
static::eat();
} else {
$numCrumbs++;
}
self::add(new self($title, self::updateURL($url, $numCrumbs)));
}
}
private static function updateURL(string $url, int $num) {
$question = strpos($url, "?");
if ($question > 0) {
$url =
substr($url, 0, $question) . "?_crumb=$num&" .
substr($url, $question + 1);
} else {
$url .= "?_crumb=$num";
}
return $url;
}
public static function add(breadcrumb $crumb) {
static::$crumbs[] = $crumb;
}
/**
* Get the title of the breadcrumb
* @return string title
*/
public function getTitle() {
return $this->title;
}
/**
* Get the URL of the breadcrumb
* @return string url
*/
public function getURL() {
return $this->url;
}
/**
* This function reads the crumbs from the session, and makes sure it is updated
*/
public static function init() {
if (isset($_SESSION["crumbs"])) {
static::$crumbs=$_SESSION["crumbs"];
}
$_SESSION["crumbs"]=&static::$crumbs;
}
/**
* construct the link for clearing the crumbs (the 'x' on the right)
*/
public static function getClearURL() {
if ($_POST) {
$clear_url=$_SERVER["PHP_SELF"] . "?" . getvar("_qs");
} else {
$clear_url = htmlentities($_SERVER["REQUEST_URI"]);
}
if (strpos($clear_url, "clear_crumbs") == 0) {
if (strpos($clear_url, "?") > 0) {
$clear_url .= "&";
} else {
$clear_url .= "?";
}
$clear_url .= "_clear_crumbs=1";
}
return $clear_url;
}
/**
* Eat a crumb
* A crumb is 'eaten' when a user clicks on the link
* it means that the crumbs at the end are removed up to the place
* where the user went back to
* @param int number of crumbs up to which to eat
*/
public static function eat($num = -1) {
if (count(static::$crumbs) > 0) {
if ($num < 0) {
$num = count(static::$crumbs) - 1;
}
static::$crumbs = array_slice(static::$crumbs, 0, $num);
}
}
/**
* Get the last crumb
*/
public static function getLast() {
if (count(static::$crumbs) > 0) {
return end(static::$crumbs);
}
}
public static function display() {
$user=user::getCurrent();
$max_crumbs=$user?->prefs->get("num_breadcrumbs") ?? 10;
if (($num_crumbs = count(static::$crumbs)) > $max_crumbs) {
$crumbs=array_slice(static::$crumbs, $num_crumbs - $max_crumbs);
$class="firstdots";
} else {
$crumbs=static::$crumbs;
$class="";
}
$tpl=new block("breadcrumbs", array(
"crumbs" => $crumbs,
"class" => $class,
"clearURL" => static::getClearURL()
));
return $tpl;
}
}
?>
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