<?php
class template
{
	var $vars = array();
	var $tpldir = "templates/";
	function __construct($path = "templates/") 
	{
		$this->tpldir = $path;
	}
	public function assign($varname, $varcontent)
	{
		if (!is_array($varcontent))
		{
			$this->vars[$varname] = $varcontent;
		}
		else
		{
			die("Arrays werden nicht unterstützt!");
		}
	}
	public function display($template)
	{
		if (file_exists($this->tpldir.$template))
		{
			$tplload = file_get_contents($this->tpldir.$template);
			$tplload = $this->tpl_include($tplload);
			$tplload = $this->tpl_session($tplload);
			$tplload = $this->tpl_if($tplload);
			while (preg_match("/\{%(.*)\}/", $tplload, $match) == 1)
			{
				if (!isset($this->vars[$match[1]]))
				{
					die("Die Variable $match[1] wurde nicht zugewiesen");
				}
				else
				{
					$tplload = str_replace($match[0], $this->vars[$match[1]], $tplload);
				}
			}
			echo $tplload;
		}
		else
		{
			die("Die angegebene Templatedatei existiert nicht!");
		}
	}
	private function tpl_include($template)
	{
		while (preg_match("/\{include:(.*)}/", $template, $match))
		{
			if(file_exists($this->tpldir.$match[1]))
			{
				$incload = file_get_contents($this->tpldir.$match[1]);
				$template = str_replace($match[0], $incload, $template);
			}
			else
			{
				die ("Die Datei $match[1] existiert nicht");
			}
		}
		return $template;
	}
	private function tpl_session($template)
	{
		while (preg_match("/\{session\:(.*)\=(.*)\}(.*){\/session}/s", $template, $match))
		{
			if ($_SESSION[$match[1]] == $match[2])
			{
				$template = str_replace($match[0], $match[3], $template);
			}
			else
			{
				$template = str_replace($match[0], NULL, $template);
			}
		}
		return $template;
	}
	private function tpl_if($template)
	{
		while (preg_match("/\{if\:(.*)\=(.*)\}(.*){\/if}/s", $template, $match))
		{
			if ($this->vars[$match[1]] == $match[2])
			{
				$template = str_replace($match[0], $match[3], $template);
			}
			else
			{
				$template = str_replace($match[0], NULL, $template);
			}
		}
		return $template;
	}
}
?>