<?php
define('RENDER_DEFAULT_TITLE', 'bwLehrpool');
require_once('Mustache/Autoloader.php');
Mustache_Autoloader::register();
/**
* HTML rendering helper class
*/
Render::init();
class Render
{
private static ?Mustache_Engine $mustache = null;
private static $body = '';
private static $header = '';
private static $footer = '';
private static $title = '';
private static $templateCache = array();
private static $tags = array();
public static function init()
{
if (self::$mustache !== null)
Util::traceError('Called Render::init() twice!');
self::$mustache = new Mustache_Engine;
}
/**
* Output the buffered, generated page
*/
public static function output(): void
{
Header('Content-Type: text/html; charset=utf-8');
ob_start('ob_gzhandler');
echo
'<!DOCTYPE html>
<html lang="de">
<head>
<title>', RENDER_DEFAULT_TITLE, self::$title, '</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bootstrap -->
<link href="', CONFIG_PREFIX, 'style/bootstrap.min.css" rel="stylesheet" media="screen">
<link href="', CONFIG_PREFIX, 'style/default.css" rel="stylesheet" media="screen">
<script type="text/javascript">
var TOKEN = "', Session::get('token'), '";
</script>
',
self::$header
,
' </head>
<body>
<div class="container" id="mainpage">
',
self::$body
,
' </div>
<script src="', CONFIG_PREFIX, 'script/jquery.js"></script>
<script src="', CONFIG_PREFIX, 'script/bootstrap.min.js"></script>
',
self::$footer
,
'</body>
</html>'
;
ob_end_flush();
}
/**
* Set the page title (title-tag)
*/
public static function setTitle($title)
{
self::$title = ' - ' . $title;
}
/**
* Add raw html data to the header-section of the generated page
*/
public static function addHeader($html)
{
self::$header .= $html . "\n";
}
/**
* Add raw html data to the footer-section of the generated page (right before the closing body tag)
*/
public static function addFooter($html)
{
self::$footer .= $html . "\n";
}
/**
* Add given js script file from the script directory to the header
*
* @param string $file file name of script
*/
public static function addScriptTop($file)
{
self::addHeader('<script src="', CONFIG_PREFIX, 'script/' . $file . '.js"></script>');
}
/**
* Add given js script file from the script directory to the bottom
*
* @param string $file file name of script
*/
public static function addScriptBottom($file)
{
self::addFooter('<script src="', CONFIG_PREFIX, 'script/' . $file . '.js"></script>');
}
/**
* Add the given template to the output, using the given params for placeholders in the template
*/
public static function addTemplate($template, $params = false)
{
self::$body .= self::parse($template, $params);
}
/**
* Add a dialog to the page output.
*
* @param string $title Title of the dialog window
* @param boolean $next URL to next dialog step, or false to hide the next button
* @param string $template template used to fill the dialog body
* @param array $params parameters for rendering the body template
*/
public static function addDialog($title, $next, $template, $params = false)
{
self::addTemplate('dialog-generic', array(
'title' => $title,
'next' => $next,
'body' => self::parse($template, $params)
));
}
/**
* Add error message to page
*/
public static function addError($message)
{
self::addTemplate('messagebox-error', array('message' => $message));
}
/**
* Parse template with given params and return; do not add to body
* @param string $template name of template, relative to templates/, without .html extension
* @return string Rendered template
*/
public static function parse($template, $params = false)
{
// Load html snippet
$html = self::getTemplate($template);
// Always add token to parameter list
if (is_array($params) || $params === false || is_null($params))
$params['token'] = Session::get('token');
// Return rendered html
return self::$mustache->render($html, $params);
}
/**
* Open the given html tag, optionally adding the passed assoc array of params
*/
public static function openTag($tag, $params = false)
{
array_push(self::$tags, $tag);
if (!is_array($params)) {
self::$body .= '<' . $tag . '>';
} else {
self::$body .= '<' . $tag;
foreach ($params as $key => $val) {
self::$body .= ' ' . $key . '="' . htmlspecialchars($val) . '"';
}
self::$body .= '>';
}
}
/**
* Close the given tag. Will check if it maches the tag last opened
*/
public static function closeTag($tag)
{
if (empty(self::$tags))
Util::traceError('Tried to close tag ' . $tag . ' when no open tags exist.');
$last = array_pop(self::$tags);
if ($last !== $tag)
Util::traceError('Tried to close tag ' . $tag . ' when last opened tag was ' . $last);
self::$body .= '</' . $tag . '>';
}
/**
* Private helper: Load the given template and return it
*/
private static function getTemplate($template)
{
if (isset(self::$templateCache[$template])) {
return self::$templateCache[$template];
}
// Load from disk
$data = @file_get_contents('templates/' . $template . '.html');
if ($data === false)
$data = '<b>Non-existent template ' . $template . ' requested!</b>';
self::$templateCache[$template] = & $data;
return $data;
}
}
