rapid_template.php

<?php
/**
 * Rapid tempalte class
 * 
 * Rapid Template is a powerful and fast template engine. Template syntax very similar to phpBB Templates and is very simple.
 * Rapid Template provides full separation of design from code.
 * @package RapidTemplate
 * @author Alek$ <aleks@aradmin.org>
 */

class Template
{
	var $file = "";
	var $rows = array();
	var $vars = array();
	var $compiled = "";

/**
 * Set main template file
 * 
 * Sets basic template file, which defines basic page layout.
 * @param string $fname Template name without ".tpl" extension
 * @return void
 */

	
	function set_file($fname)
	{
		$file = "./template/$fname.tpl";
		if(is_file($file) && is_readable($file))
		{
			$this->file = $file;
			return;
		}
		die("<b>Fatal Error:</b> can't open template file /template/$fname.tpl.");
	}

/**
 * Defines array of first-level template variables
 * 
 * Variables are passed to function as an array:
 * array('VAR1' => $value1, 'VAR2' => $value2, ... )
 * @param array $vars Array of vars
 * @return void
 */

	function set_vars($vars)
	{
		foreach($vars as $var => $val)
		{
			$this->vars["{{$var}}"] = $val;
		}
		//dbg($this->vars);
	}

/**
 * Defines loop variables
 * @param string $row loop name. Nested loop names are separated by comma
 * @param array $vars Array of vars
 * @return void
 */

	function set_row_vars($row, $vars)
	{
		$row_arr = explode('.',$row);
		// [$row][$subrow1][$subrow2][#vars]
		$c = &$this->rows;
		$last = $row_arr[sizeof($row_arr)-1];
		foreach($row_arr as $r)
		{
			if(!isset($c['#rows'][$r]) && $r != $last)
			{
				return false;
			}
			else if($r == $last)
			{
				$c['#rows'][$r][] = array(
					'#vars'	=> array(),
					'#rows'	=> array(),
				);
			}
			$c = &$c['#rows'][$r][sizeof($c['#rows'][$r])-1];
			//$c['#rows'] = $c['#vars'] = array();
		}
		
		foreach($vars as $var => $val)
		{
			$c['#vars']["{{$var}}"] = $val;
		}
	}

/**
 * Load file
 * @param void $file
 */

	function load_file($file)
	{
		$c = file_get_contents($file);
		$matches = array();
		preg_match_all('#<!-- INCLUDE ([^>]+) -->#', $c, $matches, PREG_SET_ORDER);
		
		$f = $r = array();
		
		foreach($matches as $inc)
		{
			if(!is_file("./template/{$inc[1]}.tpl") || !is_readable("./template/{$inc[1]}.tpl"))
			{
				continue;
			}
			$f[] = $inc[0];
			$r[] = $this->load_file("./template/{$inc[1]}.tpl");
		}
		
		$c = str_replace($f, $r, $c);
		return $c;
	}

/**
 * Complie template
 */

	function compile()
	{
		$c = $this->load_file($this->file);
		$c = str_replace(array_keys($this->vars), array_values($this->vars), $c);
		//dbg($this->rows);
		$matches = array();
		preg_match_all('#<!-- BEGIN ([a-zA-Z._]+) -->#', $c, $matches, PREG_SET_ORDER);
		$indexes = array();
		$loops = array();
		$i = 0;
		foreach($matches as $match)
		{
			$indexes[$match[1]] = "\$i_$i";
			$rows = explode('.', $match[1]);
			$loop = "<?php for({$indexes[$match[1]]} = 0; {$indexes[$match[1]]} < sizeof(\$this->rows['#rows']['$rows[0]']";
			for($j = 1; $j < sizeof($rows); $j++)
			{
				$in = implode('.', array_slice($rows, 0, $j));
				$loop .= "[{$indexes[$in]}]['#rows']['{$rows[$j]}']";
			}
			$loop .= "); {$indexes[$match[1]]}++){ ?>";
			$loops[$match[0]] = $loop;
			$i++;
		}
		$c = str_replace(array_keys($loops), array_values($loops), $c);
		$c = str_replace('<!-- END -->', '<?php } ?>', $c);
		
		$matches = array();
		$vars = array();
		preg_match_all('#{([A-Za-z_]+\.[A-Za-z_.]+)}#', $c, $matches, PREG_SET_ORDER);
		foreach($matches as $match)
		{
			$rows = explode('.', $match[1]);
			$var = "<?=(\$this->rows";
			for($j = 0; $j < sizeof($rows)-1; $j++)
			{
				$in = implode('.', array_slice($rows, 0, $j+1));
				$var .= "['#rows']['{$rows[$j]}'][{$indexes[$in]}]";
			}
			$var .= "['#vars']['{{$rows[$j]}}']) ?>";
			$vars[$match[0]] = $var;
			$i++;
		}
		
		$c = str_replace(array_keys($vars), array_values($vars), $c);
		$this->compiled = '?>'.$c;
	}

/**
 * Compile and display template
 * @return bool
 */

	function display()
	{
		
		$this->compile();
		eval($this->compiled);
		//file_put_contents('./cache/' . md5($this->file) . '.tpl', $this->compiled);
		//require('./cache/' . md5($this->file) . '.tpl');
	}
}

$template = new Template();
?>