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<?php
	
	class template_compile
	{
		var $template;
	
		// Various storage arrays
		var $block_names = array();
		var $block_else_level = array();
	
		/**
		* constuctor
		*/
		function template_compile(&$template)
		{
			$this->template = &$template;
		}
	
		/**
		* Load template source from file
		* @access private
		*/
		function _tpl_load_file($handle, $store_in_db = false)
		{
			// Try and open template for read
			if (!file_exists($this->template->files[$handle]))
			{
				trigger_error("template->_tpl_load_file(): File {$this->template->files[$handle]} does not exist or is empty", E_USER_ERROR);
			}
	
			$this->template->compiled_code[$handle] = $this->compile(trim(@file_get_contents($this->template->files[$handle])));
	
			// Actually compile the code now.
			$this->compile_write($handle, $this->template->compiled_code[$handle]);
	
			// Store in database if required...
			if ($store_in_db)
			{
				global $db, $user;
	
				$sql_ary = array(
					'template_id'			=> $this->template->files_template[$handle],
					'template_filename'		=> $this->template->filename[$handle],
					'template_included'		=> '',
					'template_mtime'		=> time(),
					'template_data'			=> trim(@file_get_contents($this->template->files[$handle])),
				);
	
				$sql = 'INSERT INTO ' . STYLES_TEMPLATE_DATA_TABLE . ' ' . $db->sql_build_array('INSERT', $sql_ary);
				$db->sql_query($sql);
			}
		}
	
		/**
		* Remove any PHP tags that do not belong, these regular expressions are derived from
		* the ones that exist in zend_language_scanner.l
		* @access private
		*/
		function remove_php_tags(&$code)
		{
			// This matches the information gathered from the internal PHP lexer
			$match = array(
				'#<([\?%])=?.*?\1>#s',
				'#<script\s+language\s*=\s*(["\']?)php\1\s*>.*?</script\s*>#s',
				'#<\?php(?:\r\n?|[ \n\t]).*?\?>#s'
			);
	
			$code = preg_replace($match, '', $code);
		}
	
		/**
		* The all seeing all doing compile method. Parts are inspired by or directly from Smarty
		* @access private
		*/
		function compile($code, $no_echo = false, $echo_var = '')
		{
			global $config;
	
			if ($echo_var)
			{
				global $echo_var;
			}
	
			// Remove any "loose" php ... we want to give admins the ability
			// to switch on/off PHP for a given template. Allowing unchecked
			// php is a no-no. There is a potential issue here in that non-php
			// content may be removed ... however designers should use entities
			// if they wish to display < and >
			$this->remove_php_tags($code);
	
			// Pull out all block/statement level elements and separate plain text
			preg_match_all('#<!-- PHP -->(.*?)<!-- ENDPHP -->#s', $code, $matches);
			$php_blocks = $matches[1];
			$code = preg_replace('#<!-- PHP -->.*?<!-- ENDPHP -->#s', '<!-- PHP -->', $code);
	
			preg_match_all('#<!-- INCLUDE (\{\$?[A-Z0-9\-_]+\}|[a-zA-Z0-9\_\-\+\./]+) -->#', $code, $matches);
			$include_blocks = $matches[1];
			$code = preg_replace('#<!-- INCLUDE (?:\{\$?[A-Z0-9\-_]+\}|[a-zA-Z0-9\_\-\+\./]+) -->#', '<!-- INCLUDE -->', $code);
	
			preg_match_all('#<!-- INCLUDEPHP ([a-zA-Z0-9\_\-\+\./]+) -->#', $code, $matches);
			$includephp_blocks = $matches[1];
			$code = preg_replace('#<!-- INCLUDEPHP [a-zA-Z0-9\_\-\+\./]+ -->#', '<!-- INCLUDEPHP -->', $code);
	
			preg_match_all('#<!-- ([^<].*?) (.*?)? ?-->#', $code, $blocks, PREG_SET_ORDER);
	
			$text_blocks = preg_split('#<!-- [^<].*? (?:.*?)? ?-->#', $code);
	
			for ($i = 0, $j = sizeof($text_blocks); $i < $j; $i++)
			{
				$this->compile_var_tags($text_blocks[$i]);
			}
			$compile_blocks = array();
	
			for ($curr_tb = 0, $tb_size = sizeof($blocks); $curr_tb < $tb_size; $curr_tb++)
			{
				$block_val = &$blocks[$curr_tb];
	
				switch ($block_val[1])
				{
					case 'BEGIN':
						$this->block_else_level[] = false;
						$compile_blocks[] = '<?php ' . $this->compile_tag_block($block_val[2]) . ' ?>';
					break;
	
					case 'BEGINELSE':
						$this->block_else_level[sizeof($this->block_else_level) - 1] = true;
						$compile_blocks[] = '<?php }} else { ?>';
					break;
	
					case 'END':
						array_pop($this->block_names);
						$compile_blocks[] = '<?php ' . ((array_pop($this->block_else_level)) ? '}' : '}}') . ' ?>';
					break;
	
					case 'IF':
						$compile_blocks[] = '<?php ' . $this->compile_tag_if($block_val[2], false) . ' ?>';
					break;
	
					case 'ELSE':
						$compile_blocks[] = '<?php } else { ?>';
					break;
	
					case 'ELSEIF':
						$compile_blocks[] = '<?php ' . $this->compile_tag_if($block_val[2], true) . ' ?>';
					break;
	
					case 'ENDIF':
						$compile_blocks[] = '<?php } ?>';
					break;
	
					case 'DEFINE':
						$compile_blocks[] = '<?php ' . $this->compile_tag_define($block_val[2], true) . ' ?>';
					break;
	
					case 'UNDEFINE':
						$compile_blocks[] = '<?php ' . $this->compile_tag_define($block_val[2], false) . ' ?>';
					break;
	
					case 'INCLUDE':
						$temp = array_shift($include_blocks);
	
						// Dynamic includes
						// Cheap match rather than a full blown regexp, we already know
						// the format of the input so just use string manipulation.
						if ($temp[0] == '{')
						{
							$file = false;
	
							if ($temp[1] == ' )
							{
								$var = substr($temp, 2, -1);
								//$file = $this->template->_tpldata['DEFINE']['.'][$var];
								$temp = "\$this->_tpldata['DEFINE']['.']['$var']";
							}
							else
							{
								$var = substr($temp, 1, -1);
								//$file = $this->template->_rootref[$var];
								$temp = "\$this->_rootref['$var']";
							}
						}
						else
						{
							$file = $temp;
						}
	
						$compile_blocks[] = '<?php ' . $this->compile_tag_include($temp) . ' ?>';
	
						// No point in checking variable includes
						if ($file)
						{
							$this->template->_tpl_include($file, false);
						}
					break;
	
					case 'INCLUDEPHP':
						$compile_blocks[] = ($config['tpl_allow_php']) ? '<?php ' . $this->compile_tag_include_php(array_shift($includephp_blocks)) . ' ?>' : '';
					break;
	
					case 'PHP':
						$compile_blocks[] = ($config['tpl_allow_php']) ? '<?php ' . array_shift($php_blocks) . ' ?>' : '';
					break;
	
					default:
						$this->compile_var_tags($block_val[0]);
						$trim_check = trim($block_val[0]);
						$compile_blocks[] = (!$no_echo) ? ((!empty($trim_check)) ? $block_val[0] : '') : ((!empty($trim_check)) ? $block_val[0] : '');
					break;
				}
			}
	
			$template_php = '';
			for ($i = 0, $size = sizeof($text_blocks); $i < $size; $i++)
			{
				$trim_check_text = trim($text_blocks[$i]);
				$template_php .= (!$no_echo) ? (($trim_check_text != '') ? $text_blocks[$i] : '') . ((isset($compile_blocks[$i])) ? $compile_blocks[$i] : '') : (($trim_check_text != '') ? $text_blocks[$i] : '') . ((isset($compile_blocks[$i])) ? $compile_blocks[$i] : '');
			}
	
			// Remove unused opening/closing tags
			$template_php = str_replace(' ?><?php ', ' ', $template_php);
	
			// Now add a newline after each php closing tag which already has a newline
			// PHP itself strips a newline if a closing tag is used (this is documented behaviour) and it is mostly not intended by style authors to remove newlines
			$template_php = preg_replace('#\?\>([\r\n])#', '?>\1\1', $template_php);
	
			// There will be a number of occasions where we switch into and out of
			// PHP mode instantaneously. Rather than "burden" the parser with this
			// we'll strip out such occurences, minimising such switching
			if ($no_echo)
			{
				return "\$echo_var .= '" . $template_php . "'";
			}
	
			return $template_php;
		}
	
		/**
		* Compile variables
		* @access private
		*/
		function compile_var_tags(&$text_blocks)
		{
			// change template varrefs into PHP varrefs
			$varrefs = array();
	
			// This one will handle varrefs WITH namespaces
			preg_match_all('#\{((?:[a-z0-9\-_]+\.)+)(\$)?([A-Z0-9\-_]+)\}#', $text_blocks, $varrefs, PREG_SET_ORDER);
	
			foreach ($varrefs as $var_val)
			{
				$namespace = $var_val[1];
				$varname = $var_val[3];
				$new = $this->generate_block_varref($namespace, $varname, true, $var_val[2]);
	
				$text_blocks = str_replace($var_val[0], $new, $text_blocks);
			}
	
			// This will handle the remaining root-level varrefs
			// transform vars prefixed by L_ into their language variable pendant if nothing is set within the tpldata array
			if (strpos($text_blocks, '{L_') !== false)
			{
				$text_blocks = preg_replace('#\{L_([A-Z0-9\-_]+)\}#', "<?php echo ((isset(\$this->_rootref['L_\\1'])) ? \$this->_rootref['L_\\1'] : ((isset(\$user->lang['\\1'])) ? \$user->lang['\\1'] : '{ \\1 }')); ?>", $text_blocks);
			}
	
			// Handle addslashed language variables prefixed with LA_
			// If a template variable already exist, it will be used in favor of it...
			if (strpos($text_blocks, '{LA_') !== false)
			{
				$text_blocks = preg_replace('#\{LA_([A-Z0-9\-_]+)\}#', "<?php echo ((isset(\$this->_rootref['LA_\\1'])) ? \$this->_rootref['LA_\\1'] : ((isset(\$this->_rootref['L_\\1'])) ? addslashes(\$this->_rootref['L_\\1']) : ((isset(\$user->lang['\\1'])) ? addslashes(\$user->lang['\\1']) : '{ \\1 }'))); ?>", $text_blocks);
			}
	
			// Handle remaining varrefs
			$text_blocks = preg_replace('#\{([A-Z0-9\-_]+)\}#', "<?php echo (isset(\$this->_rootref['\\1'])) ? \$this->_rootref['\\1'] : ''; ?>", $text_blocks);
			$text_blocks = preg_replace('#\{\$([A-Z0-9\-_]+)\}#', "<?php echo (isset(\$this->_tpldata['DEFINE']['.']['\\1'])) ? \$this->_tpldata['DEFINE']['.']['\\1'] : ''; ?>", $text_blocks);
	
			return;
		}
	
		/**
		* Compile blocks
		* @access private
		*/
		function compile_tag_block($tag_args)
		{
			$no_nesting = false;
	
			// Is the designer wanting to call another loop in a loop?
			if (strpos($tag_args, '!') === 0)
			{
				// Count the number of ! occurrences (not allowed in vars)
				$no_nesting = substr_count($tag_args, '!');
				$tag_args = substr($tag_args, $no_nesting);
			}
	
			// Allow for control of looping (indexes start from zero):
			// foo(2)	: Will start the loop on the 3rd entry
			// foo(-2)   : Will start the loop two entries from the end
			// foo(3,4)  : Will start the loop on the fourth entry and end it on the fifth
			// foo(3,-4) : Will start the loop on the fourth entry and end it four from last
			if (preg_match('#^([^()]*)\(([\-\d]+)(?:,([\-\d]+))?\)$#', $tag_args, $match))
			{
				$tag_args = $match[1];
	
				if ($match[2] < 0)
				{
					$loop_start = '($_' . $tag_args . '_count ' . $match[2] . ' < 0 ? 0 : $_' . $tag_args . '_count ' . $match[2] . ')';
				}
				else
				{
					$loop_start = '($_' . $tag_args . '_count < ' . $match[2] . ' ? $_' . $tag_args . '_count : ' . $match[2] . ')';
				}
	
				if (strlen($match[3]) < 1 || $match[3] == -1)
				{
					$loop_end = '$_' . $tag_args . '_count';
				}
				else if ($match[3] >= 0)
				{
					$loop_end = '(' . ($match[3] + 1) . ' > $_' . $tag_args . '_count ? $_' . $tag_args . '_count : ' . ($match[3] + 1) . ')';
				}
				else //if ($match[3] < -1)
				{
					$loop_end = '$_' . $tag_args . '_count' . ($match[3] + 1);
				}
			}
			else
			{
				$loop_start = 0;
				$loop_end = '$_' . $tag_args . '_count';
			}
	
			$tag_template_php = '';
			array_push($this->block_names, $tag_args);
	
			if ($no_nesting !== false)
			{
				// We need to implode $no_nesting times from the end...
				$block = array_slice($this->block_names, -$no_nesting);
			}
			else
			{
				$block = $this->block_names;
			}
	
			if (sizeof($block) < 2)
			{
				// Block is not nested.
				$tag_template_php = '$_' . $tag_args . "_count = (isset(\$this->_tpldata['$tag_args'])) ? sizeof(\$this->_tpldata['$tag_args']) : 0;";
				$varref = "\$this->_tpldata['$tag_args']";
			}
			else
			{
				// This block is nested.
				// Generate a namespace string for this block.
				$namespace = implode('.', $block);
	
				// Get a reference to the data array for this block that depends on the
				// current indices of all parent blocks.
				$varref = $this->generate_block_data_ref($namespace, false);
	
				// Create the for loop code to iterate over this block.
				$tag_template_php = '$_' . $tag_args . '_count = (isset(' . $varref . ')) ? sizeof(' . $varref . ') : 0;';
			}
	
			$tag_template_php .= 'if ($_' . $tag_args . '_count) {';
	
			/**
			* The following uses foreach for iteration instead of a for loop, foreach is faster but requires PHP to make a copy of the contents of the array which uses more memory
			* <code>
			*	if (!$offset)
			*	{
			*		$tag_template_php .= 'foreach (' . $varref . ' as $_' . $tag_args . '_i => $_' . $tag_args . '_val){';
			*	}
			* </code>
			*/
	
			$tag_template_php .= 'for ($_' . $tag_args . '_i = ' . $loop_start . '; $_' . $tag_args . '_i < ' . $loop_end . '; ++$_' . $tag_args . '_i){';
			$tag_template_php .= '$_'. $tag_args . '_val = &' . $varref . '[$_'. $tag_args. '_i];';
	
			return $tag_template_php;
		}
	
		/**
		* Compile IF tags - much of this is from Smarty with
		* some adaptions for our block level methods
		* @access private
		*/
		function compile_tag_if($tag_args, $elseif)
		{
			// Tokenize args for 'if' tag.
			preg_match_all('/(?:
				"[^"\\\\]*(?:\\\\.[^"\\\\]*)*" 		|
				\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\' 	|
				[(),]                              	|
				[^\s(),]+)/x', $tag_args, $match);
	
			$tokens = $match[0];
			$is_arg_stack = array();
	
			for ($i = 0, $size = sizeof($tokens); $i < $size; $i++)
			{
				$token = &$tokens[$i];
	
				switch ($token)
				{
					case '!==':
					case '===':
					case '<<':
					case '>>':
					case '|':
					case '^':
					case '&':
					case '~':
					case ')':
					case ',':
					case '+':
					case '-':
					case '*':
					case '/':
					case '@':
					break;
	
					case '==':
					case 'eq':
						$token = '==';
					break;
	
					case '!=':
					case '<>':
					case 'ne':
					case 'neq':
						$token = '!=';
					break;
	
					case '<':
					case 'lt':
						$token = '<';
					break;
	
					case '<=':
					case 'le':
					case 'lte':
						$token = '<=';
					break;
	
					case '>':
					case 'gt':
						$token = '>';
					break;
	
					case '>=':
					case 'ge':
					case 'gte':
						$token = '>=';
					break;
	
					case '&&':
					case 'and':
						$token = '&&';
					break;
	
					case '||':
					case 'or':
						$token = '||';
					break;
	
					case '!':
					case 'not':
						$token = '!';
					break;
	
					case '%':
					case 'mod':
						$token = '%';
					break;
	
					case '(':
						array_push($is_arg_stack, $i);
					break;
	
					case 'is':
						$is_arg_start = ($tokens[$i-1] == ')') ? array_pop($is_arg_stack) : $i-1;
						$is_arg	= implode('	', array_slice($tokens,	$is_arg_start, $i -	$is_arg_start));
	
						$new_tokens	= $this->_parse_is_expr($is_arg, array_slice($tokens, $i+1));
	
						array_splice($tokens, $is_arg_start, sizeof($tokens), $new_tokens);
	
						$i = $is_arg_start;
	
					// no break
	
					default:
						if (preg_match('#^((?:[a-z0-9\-_]+\.)+)?(\$)?(?=[A-Z])([A-Z0-9\-_]+)#s', $token, $varrefs))
						{
							$token = (!empty($varrefs[1])) ? $this->generate_block_data_ref(substr($varrefs[1], 0, -1), true, $varrefs[2]) . '[\'' . $varrefs[3] . '\']' : (($varrefs[2]) ? '$this->_tpldata[\'DEFINE\'][\'.\'][\'' . $varrefs[3] . '\']' : '$this->_rootref[\'' . $varrefs[3] . '\']');
						}
						else if (preg_match('#^\.((?:[a-z0-9\-_]+\.?)+)$#s', $token, $varrefs))
						{
							// Allow checking if loops are set with .loopname
							// It is also possible to check the loop count by doing <!-- IF .loopname > 1 --> for example
							$blocks = explode('.', $varrefs[1]);
	
							// If the block is nested, we have a reference that we can grab.
							// If the block is not nested, we just go and grab the block from _tpldata
							if (sizeof($blocks) > 1)
							{
								$block = array_pop($blocks);
								$namespace = implode('.', $blocks);
								$varref = $this->generate_block_data_ref($namespace, true);
	
								// Add the block reference for the last child.
								$varref .= "['" . $block . "']";
							}
							else
							{
								$varref = '$this->_tpldata';
	
								// Add the block reference for the last child.
								$varref .= "['" . $blocks[0] . "']";
							}
							$token = "sizeof($varref)";
						}
						else if (!empty($token))
						{
							$token = '(' . $token . ')';
						}
	
					break;
				}
			}
	
			// If there are no valid tokens left or only control/compare characters left, we do skip this statement
			if (!sizeof($tokens) || str_replace(array(' ', '=', '!', '<', '>', '&', '|', '%', '(', ')'), '', implode('', $tokens)) == '')
			{
				$tokens = array('false');
			}
			return (($elseif) ? '} else if (' : 'if (') . (implode(' ', $tokens) . ') { ');
		}
	
		/**
		* Compile DEFINE tags
		* @access private
		*/
		function compile_tag_define($tag_args, $op)
		{
			preg_match('#^((?:[a-z0-9\-_]+\.)+)?\$(?=[A-Z])([A-Z0-9_\-]*)(?: = (\'?)([^\']*)(\'?))?$#', $tag_args, $match);
	
			if (empty($match[2]) || (!isset($match[4]) && $op))
			{
				return '';
			}
	
			if (!$op)
			{
				return 'unset(' . (($match[1]) ? $this->generate_block_data_ref(substr($match[1], 0, -1), true, true) . '[\'' . $match[2] . '\']' : '$this->_tpldata[\'DEFINE\'][\'.\'][\'' . $match[2] . '\']') . ');';
			}
	
			// Are we a string?
			if ($match[3] && $match[5])
			{
				$match[4] = str_replace(array('\\\'', '\\\\', '\''), array('\'', '\\', '\\\''), $match[4]);
	
				// Compile reference, we allow template variables in defines...
				$match[4] = $this->compile($match[4]);
	
				// Now replace the php code
				$match[4] = "'" . str_replace(array('<?php echo ', '; ?>'), array("' . ", " . '"), $match[4]) . "'";
			}
			else
			{
				preg_match('#true|false|\.#i', $match[4], $type);
	
				switch (strtolower($type[0]))
				{
					case 'true':
					case 'false':
						$match[4] = strtoupper($match[4]);
					break;
	
					case '.':
						$match[4] = doubleval($match[4]);
					break;
	
					default:
						$match[4] = intval($match[4]);
					break;
				}
			}
	
			return (($match[1]) ? $this->generate_block_data_ref(substr($match[1], 0, -1), true, true) . '[\'' . $match[2] . '\']' : '$this->_tpldata[\'DEFINE\'][\'.\'][\'' . $match[2] . '\']') . ' = ' . $match[4] . ';';
		}
	
		/**
		* Compile INCLUDE tag
		* @access private
		*/
		function compile_tag_include($tag_args)
		{
			// Process dynamic includes
			if ($tag_args[0] == ' )
			{
				return "if (isset($tag_args)) { \$this->_tpl_include($tag_args); }";
			}
	
			return "\$this->_tpl_include('$tag_args');";
		}
	
		/**
		* Compile INCLUDE_PHP tag
		* @access private
		*/
		function compile_tag_include_php($tag_args)
		{
			return "\$this->_php_include('$tag_args');";
		}
	
		/**
		* parse expression
		* This is from Smarty
		* @access private
		*/
		function _parse_is_expr($is_arg, $tokens)
		{
			$expr_end = 0;
			$negate_expr = false;
	
			if (($first_token = array_shift($tokens)) == 'not')
			{
				$negate_expr = true;
				$expr_type = array_shift($tokens);
			}
			else
			{
				$expr_type = $first_token;
			}
	
			switch ($expr_type)
			{
				case 'even':
					if (@$tokens[$expr_end] == 'by')
					{
						$expr_end++;
						$expr_arg = $tokens[$expr_end++];
						$expr = "!(($is_arg / $expr_arg) % $expr_arg)";
					}
					else
					{
						$expr = "!($is_arg & 1)";
					}
				break;
	
				case 'odd':
					if (@$tokens[$expr_end] == 'by')
					{
						$expr_end++;
						$expr_arg = $tokens[$expr_end++];
						$expr = "(($is_arg / $expr_arg) % $expr_arg)";
					}
					else
					{
						$expr = "($is_arg & 1)";
					}
				break;
	
				case 'div':
					if (@$tokens[$expr_end] == 'by')
					{
						$expr_end++;
						$expr_arg = $tokens[$expr_end++];
						$expr = "!($is_arg % $expr_arg)";
					}
				break;
			}
	
			if ($negate_expr)
			{
				$expr = "!($expr)";
			}
	
			array_splice($tokens, 0, $expr_end, $expr);
	
			return $tokens;
		}
	
		/**
		* Generates a reference to the given variable inside the given (possibly nested)
		* block namespace. This is a string of the form:
		* ' . $this->_tpldata['parent'][$_parent_i]['$child1'][$_child1_i]['$child2'][$_child2_i]...['varname'] . '
		* It's ready to be inserted into an "echo" line in one of the templates.
		* NOTE: expects a trailing "." on the namespace.
		* @access private
		*/
		function generate_block_varref($namespace, $varname, $echo = true, $defop = false)
		{
			// Strip the trailing period.
			$namespace = substr($namespace, 0, -1);
	
			// Get a reference to the data block for this namespace.
			$varref = $this->generate_block_data_ref($namespace, true, $defop);
			// Prepend the necessary code to stick this in an echo line.
	
			// Append the variable reference.
			$varref .= "['$varname']";
			$varref = ($echo) ? "<?php echo $varref; ?>" : ((isset($varref)) ? $varref : '');
	
			return $varref;
		}
	
		/**
		* Generates a reference to the array of data values for the given
		* (possibly nested) block namespace. This is a string of the form:
		* $this->_tpldata['parent'][$_parent_i]['$child1'][$_child1_i]['$child2'][$_child2_i]...['$childN']
		*
		* If $include_last_iterator is true, then [$_childN_i] will be appended to the form shown above.
		* NOTE: does not expect a trailing "." on the blockname.
		* @access private
		*/
		function generate_block_data_ref($blockname, $include_last_iterator, $defop = false)
		{
			// Get an array of the blocks involved.
			$blocks = explode('.', $blockname);
			$blockcount = sizeof($blocks) - 1;
	
			// DEFINE is not an element of any referenced variable, we must use _tpldata to access it
			if ($defop)
			{
				$varref = '$this->_tpldata[\'DEFINE\']';
				// Build up the string with everything but the last child.
				for ($i = 0; $i < $blockcount; $i++)
				{
					$varref .= "['" . $blocks[$i] . "'][\$_" . $blocks[$i] . '_i]';
				}
				// Add the block reference for the last child.
				$varref .= "['" . $blocks[$blockcount] . "']";
				// Add the iterator for the last child if requried.
				if ($include_last_iterator)
				{
					$varref .= '[$_' . $blocks[$blockcount] . '_i]';
				}
				return $varref;
			}
			else if ($include_last_iterator)
			{
				return '$_'. $blocks[$blockcount] . '_val';
			}
			else
			{
				return '$_'. $blocks[$blockcount - 1] . '_val[\''. $blocks[$blockcount]. '\']';
			}
		}
	
		/**
		* Write compiled file to cache directory
		* @access private
		*/
		function compile_write($handle, $data)
		{
			global $phpEx;
	
			$filename = $this->template->cachepath . str_replace('/', '.', $this->template->filename[$handle]) . '.' . $phpEx;
	
			$data = "<?php if (!defined('IN_PHPBB')) exit;" . ((strpos($data, '<?php') === 0) ? substr($data, 5) : ' ?>' . $data);
	
			if ($fp = @fopen($filename, 'wb'))
			{
				@flock($fp, LOCK_EX);
				@fwrite ($fp, $data);
				@flock($fp, LOCK_UN);
				@fclose($fp);
	
				//phpbb_chmod($filename, CHMOD_READ | CHMOD_WRITE);
				chmod($filename, 0777); 
			}
	
			return;
		}
	}

	class Template {
		var $_tpldata = array('.' => array(0 => array()));
		var $_rootref;
		
		var $root = '';
		var $cachepath = '';
		var $files = array();
		var $filename = array();
		var $files_inherit = array();
		var $files_template = array();
		var $inherit_root = '';
		var $orig_tpl_storedb;
		var $orig_tpl_inherits_id;
	
		var $compiled_code = array();
		
		function set_templates() {
			global $root_path, $user;
			
			if(isset($user->theme['template_path'])) {
				$template_path = $user->theme['template_path'];
			} else {
				$template_path = 'deafult';
			}
			
			if(file_exists($root_path . 'templates' . $template_path .'/template')) {
				$this->root = $root_path . 'templates' . $template_path .'/template';
				$this->cachepath = $root_path .'../tmp/cache/tpl_'.str_replace('_','-',$tempate_path) . '_';
				
				if ($this->orig_tpl_storedb === null) {
					$this->orig_tpl_storedb = $user->theme['template_storedb'];
				}

				if ($this->orig_tpl_inherits_id === null) {
					$this->orig_tpl_inherits_id = $user->theme['template_inherits_id'];
				}

				$user->theme['template_storedb'] = $this->orig_tpl_storedb;
				$user->theme['template_inherits_id'] = $this->orig_tpl_inherits_id;

				if ($user->theme['template_inherits_id']){
					$this->inherit_root = $phpbb_root_path . 'styles/' . $user->theme['template_inherit_path'] . '/template';
				}
			} else {
				trigger_error('Template path could not be found: styles/' . $user->theme['template_path'] . '/template', E_USER_ERROR);
			}

			$this->_rootref = &$this->_tpldata['.'][0];

			return true;
		}
		
		function set_custom_template($template_path, $template_name, $fallback_template_path = false) {
			global $phpbb_root_path, $user;
	
			// Make sure $template_path has no ending slash
			if (substr($template_path, -1) == '/') {
				$template_path = substr($template_path, 0, -1);
			}
	
			$this->root = $template_path;
			$this->cachepath = $phpbb_root_path . 'cache/ctpl_' . str_replace('_', '-', $template_name) . '_';
	
			if ($fallback_template_path !== false){
				if (substr($fallback_template_path, -1) == '/'){
					$fallback_template_path = substr($fallback_template_path, 0, -1);
				}
	
				$this->inherit_root = $fallback_template_path;
				$this->orig_tpl_inherits_id = true;
			} else {
				$this->orig_tpl_inherits_id = false;
			}
	
			// the database does not store the path or name of a custom template
			// so there is no way we can properly store custom templates there
			$this->orig_tpl_storedb = false;
	
			$this->_rootref = &$this->_tpldata['.'][0];
	
			return true;
		}
		
		function set_filenames($filename_array){
			if (!is_array($filename_array)) {
				return false;
			}
			
			foreach ($filename_array as $handle => $filename) {
				if (empty($filename)) {
					trigger_error("template->set_filenames: Empty filename specified for $handle", E_USER_ERROR);
				}
	
				$this->filename[$handle] = $filename;
				$this->files[$handle] = $this->root . '/' . $filename;
	
				if ($this->inherit_root){
					$this->files_inherit[$handle] = $this->inherit_root . '/' . $filename;
				}
			}
	
			return true;
		}
		
		/**
		* Destroy template data set
		* @access public
		*/
		function destroy()
		{
			$this->_tpldata = array('.' => array(0 => array()));
			$this->_rootref = &$this->_tpldata['.'][0];
		}
	
		/**
		* Reset/empty complete block
		* @access public
		*/
		function destroy_block_vars($blockname)
		{
			if (strpos($blockname, '.') !== false)
			{
				// Nested block.
				$blocks = explode('.', $blockname);
				$blockcount = sizeof($blocks) - 1;
	
				$str = &$this->_tpldata;
				for ($i = 0; $i < $blockcount; $i++)
				{
					$str = &$str[$blocks[$i]];
					$str = &$str[sizeof($str) - 1];
				}
	
				unset($str[$blocks[$blockcount]]);
			}
			else
			{
				// Top-level block.
				unset($this->_tpldata[$blockname]);
			}
	
			return true;
		}
	
		/**
		* Display handle
		* @access public
		*/
		function display($handle, $include_once = true)
		{
			global $user, $phpbb_hook;
	
			if (!empty($phpbb_hook) && $phpbb_hook->call_hook(array(__CLASS__, __FUNCTION__), $handle, $include_once, $this))
			{
				if ($phpbb_hook->hook_return(array(__CLASS__, __FUNCTION__)))
				{
					return $phpbb_hook->hook_return_result(array(__CLASS__, __FUNCTION__));
				}
			}
	
			if (defined('IN_ERROR_HANDLER'))
			{
				if ((E_NOTICE & error_reporting()) == E_NOTICE)
				{
					error_reporting(error_reporting() ^ E_NOTICE);
				}
			}
	
			if ($filename = $this->_tpl_load($handle))
			{
				($include_once) ? include_once($filename) : include($filename);
			}
			else
			{
				eval(' ?>' . $this->compiled_code[$handle] . '<?php ');
			}
	
			return true;
		}
	
		/**
		* Display the handle and assign the output to a template variable or return the compiled result.
		* @access public
		*/
		function assign_display($handle, $template_var = '', $return_content = true, $include_once = false)
		{
			ob_start();
			$this->display($handle, $include_once);
			$contents = ob_get_clean();
	
			if ($return_content)
			{
				return $contents;
			}
	
			$this->assign_var($template_var, $contents);
	
			return true;
		}

		/**
		* Load a compiled template if possible, if not, recompile it
		* @access private
		*/
		function _tpl_load(&$handle)
		{
			global $user, $phpEx, $config;
	
			if (!isset($this->filename[$handle]))
			{
				trigger_error("template->_tpl_load(): No file specified for handle $handle", E_USER_ERROR);
			}
	
			// reload these settings to have the values they had when this object was initialised
			// using set_template or set_custom_template, they might otherwise have been overwritten
			// by other template class instances in between.
			$user->theme['template_storedb'] = $this->orig_tpl_storedb;
			$user->theme['template_inherits_id'] = $this->orig_tpl_inherits_id;
	
			$filename = $this->cachepath . str_replace('/', '.', $this->filename[$handle]) . '.' . $phpEx;
			$this->files_template[$handle] = (isset($user->theme['template_id'])) ? $user->theme['template_id'] : 0;
	
			$recompile = false;
			if (!file_exists($filename) || @filesize($filename) === 0 || defined('DEBUG_EXTRA'))
			{
				$recompile = true;
			}
			else if ($config['load_tplcompile'])
			{
				// No way around it: we need to check inheritance here
				if ($user->theme['template_inherits_id'] && !file_exists($this->files[$handle]))
				{
					$this->files[$handle] = $this->files_inherit[$handle];
					$this->files_template[$handle] = $user->theme['template_inherits_id'];
				}
				$recompile = (@filemtime($filename) < filemtime($this->files[$handle])) ? true : false;
			}
	
			// Recompile page if the original template is newer, otherwise load the compiled version
			if (!$recompile)
			{
				return $filename;
			}
	
			global $db, $phpbb_root_path;
	
			// Inheritance - we point to another template file for this one. Equality is also used for store_db
			if (isset($user->theme['template_inherits_id']) && $user->theme['template_inherits_id'] && !file_exists($this->files[$handle]))
			{
				$this->files[$handle] = $this->files_inherit[$handle];
				$this->files_template[$handle] = $user->theme['template_inherits_id'];
			}
	
			$compile = new template_compile($this);
	
			// If we don't have a file assigned to this handle, die.
			if (!isset($this->files[$handle]))
			{
				trigger_error("template->_tpl_load(): No file specified for handle $handle", E_USER_ERROR);
			}
	
			// Just compile if no user object is present (happens within the installer)
			if (!$user)
			{
				$compile->_tpl_load_file($handle);
				return false;
			}
	
			if (isset($user->theme['template_storedb']) && $user->theme['template_storedb'])
			{
				$rows = array();
				$ids = array();
				// Inheritance
				if (isset($user->theme['template_inherits_id']) && $user->theme['template_inherits_id'])
				{
					$ids[] = $user->theme['template_inherits_id'];
				}
				$ids[] = $user->theme['template_id'];
	
				foreach ($ids as $id)
				{
					$sql = 'SELECT *
					FROM ' . STYLES_TEMPLATE_DATA_TABLE . '
					WHERE template_id = ' . $id . "
						AND (template_filename = '" . $db->sql_escape($this->filename[$handle]) . "'
							OR template_included " . $db->sql_like_expression($db->any_char . $this->filename[$handle] . ':' . $db->any_char) . ')';
	
					$result = $db->sql_query($sql);
					while ($row = $db->sql_fetchrow($result))
					{
						$rows[$row['template_filename']] = $row;
					}
					$db->sql_freeresult($result);
				}
	
				if (sizeof($rows))
				{
					foreach ($rows as $row)
					{
						$file = $this->root . '/' . $row['template_filename'];
						$force_reload = false;
						if ($row['template_id'] != $user->theme['template_id'])
						{
							// make sure that we are not overlooking a file not in the db yet
							if (isset($user->theme['template_inherits_id']) && $user->theme['template_inherits_id'] && !file_exists($file))
							{
								$file = $this->inherit_root . '/' . $row['template_filename'];
								$this->files[$row['template_filename']] = $file;
								$this->files_inherit[$row['template_filename']] = $file;
								$this->files_template[$row['template_filename']] = $user->theme['template_inherits_id'];
							}
							else if (isset($user->theme['template_inherits_id']) && $user->theme['template_inherits_id'])
							{
								// Ok, we have a situation. There is a file in the subtemplate, but nothing in the DB. We have to fix that.
								$force_reload = true;
								$this->files_template[$row['template_filename']] = $user->theme['template_inherits_id'];
							}
						}
						else
						{
							$this->files_template[$row['template_filename']] = $user->theme['template_id'];
						}
	
						if ($force_reload || $row['template_mtime'] < filemtime($file))
						{
							if ($row['template_filename'] == $this->filename[$handle])
							{
								$compile->_tpl_load_file($handle, true);
							}
							else
							{
								$this->files[$row['template_filename']] = $file;
								$this->filename[$row['template_filename']] = $row['template_filename'];
								$compile->_tpl_load_file($row['template_filename'], true);
								unset($this->compiled_code[$row['template_filename']]);
								unset($this->files[$row['template_filename']]);
								unset($this->filename[$row['template_filename']]);
							}
						}
	
						if ($row['template_filename'] == $this->filename[$handle])
						{
							$this->compiled_code[$handle] = $compile->compile(trim($row['template_data']));
							$compile->compile_write($handle, $this->compiled_code[$handle]);
						}
						else
						{
							// Only bother compiling if it doesn't already exist
							if (!file_exists($this->cachepath . str_replace('/', '.', $row['template_filename']) . '.' . $phpEx))
							{
								$this->filename[$row['template_filename']] = $row['template_filename'];
								$compile->compile_write($row['template_filename'], $compile->compile(trim($row['template_data'])));
								unset($this->filename[$row['template_filename']]);
							}
						}
					}
				}
				else
				{
					$file = $this->root . '/' . $row['template_filename'];
	
					if (isset($user->theme['template_inherits_id']) && $user->theme['template_inherits_id'] && !file_exists($file))
					{
						$file = $this->inherit_root . '/' . $row['template_filename'];
						$this->files[$row['template_filename']] = $file;
						$this->files_inherit[$row['template_filename']] = $file;
						$this->files_template[$row['template_filename']] = $user->theme['template_inherits_id'];
					}
					// Try to load from filesystem and instruct to insert into the styles table...
					$compile->_tpl_load_file($handle, true);
					return false;
				}
	
				return false;
			}
	
			$compile->_tpl_load_file($handle);
			return false;
		}
		
		function assign_vars($vararray) {
			foreach ($vararray as $key => $val) {
				$this->_rootref[$key] = $val;
			}
	
			return true;
		}

		/**
		* Assign a single variable to a single key
		* @access public
		*/
		function assign_var($varname, $varval) {
			$this->_rootref[$varname] = $varval;
	
			return true;
		}	
		
		function assign_block_vars($blockname, $vararray)
		{
			if (strpos($blockname, '.') !== false)
			{
				// Nested block.
				$blocks = explode('.', $blockname);
				$blockcount = sizeof($blocks) - 1;
	
				$str = &$this->_tpldata;
				for ($i = 0; $i < $blockcount; $i++)
				{
					$str = &$str[$blocks[$i]];
					$str = &$str[sizeof($str) - 1];
				}
	
				$s_row_count = isset($str[$blocks[$blockcount]]) ? sizeof($str[$blocks[$blockcount]]) : 0;
				$vararray['S_ROW_COUNT'] = $s_row_count;
	
				// Assign S_FIRST_ROW
				if (!$s_row_count)
				{
					$vararray['S_FIRST_ROW'] = true;
				}
	
				// Now the tricky part, we always assign S_LAST_ROW and remove the entry before
				// This is much more clever than going through the complete template data on display (phew)
				$vararray['S_LAST_ROW'] = true;
				if ($s_row_count > 0)
				{
					unset($str[$blocks[$blockcount]][($s_row_count - 1)]['S_LAST_ROW']);
				}
	
				// Now we add the block that we're actually assigning to.
				// We're adding a new iteration to this block with the given
				// variable assignments.
				$str[$blocks[$blockcount]][] = $vararray;
			}
			else
			{
				// Top-level block.
				$s_row_count = (isset($this->_tpldata[$blockname])) ? sizeof($this->_tpldata[$blockname]) : 0;
				$vararray['S_ROW_COUNT'] = $s_row_count;
	
				// Assign S_FIRST_ROW
				if (!$s_row_count)
				{
					$vararray['S_FIRST_ROW'] = true;
				}
	
				// We always assign S_LAST_ROW and remove the entry before
				$vararray['S_LAST_ROW'] = true;
				if ($s_row_count > 0)
				{
					unset($this->_tpldata[$blockname][($s_row_count - 1)]['S_LAST_ROW']);
				}
	
				// Add a new iteration to this block with the variable assignments we were given.
				$this->_tpldata[$blockname][] = $vararray;
			}
	
			return true;
		}
	
		/**
		* Change already assigned key variable pair (one-dimensional - single loop entry)
		*
		* An example of how to use this function:
		* {@example alter_block_array.php}
		*
		* @param	string	$blockname	the blockname, for example 'loop'
		* @param	array	$vararray	the var array to insert/add or merge
		* @param	mixed	$key		Key to search for
		*
		* array: KEY => VALUE [the key/value pair to search for within the loop to determine the correct position]
		*
		* int: Position [the position to change or insert at directly given]
		*
		* If key is false the position is set to 0
		* If key is true the position is set to the last entry
		*
		* @param	string	$mode		Mode to execute (valid modes are 'insert' and 'change')
		*
		*	If insert, the vararray is inserted at the given position (position counting from zero).
		*	If change, the current block gets merged with the vararray (resulting in new key/value pairs be added and existing keys be replaced by the new value).
		*
		* Since counting begins by zero, inserting at the last position will result in this array: array(vararray, last positioned array)
		* and inserting at position 1 will result in this array: array(first positioned array, vararray, following vars)
		*
		* @return bool false on error, true on success
		* @access public
		*/
		function alter_block_array($blockname, $vararray, $key = false, $mode = 'insert')
		{
			if (strpos($blockname, '.') !== false)
			{
				// Nested blocks are not supported
				return false;
			}
	
			// Change key to zero (change first position) if false and to last position if true
			if ($key === false || $key === true)
			{
				$key = ($key === false) ? 0 : sizeof($this->_tpldata[$blockname]);
			}
	
			// Get correct position if array given
			if (is_array($key))
			{
				// Search array to get correct position
				list($search_key, $search_value) = @each($key);
	
				$key = NULL;
				foreach ($this->_tpldata[$blockname] as $i => $val_ary)
				{
					if ($val_ary[$search_key] === $search_value)
					{
						$key = $i;
						break;
					}
				}
	
				// key/value pair not found
				if ($key === NULL)
				{
					return false;
				}
			}
	
			// Insert Block
			if ($mode == 'insert')
			{
				// Make sure we are not exceeding the last iteration
				if ($key >= sizeof($this->_tpldata[$blockname]))
				{
					$key = sizeof($this->_tpldata[$blockname]);
					unset($this->_tpldata[$blockname][($key - 1)]['S_LAST_ROW']);
					$vararray['S_LAST_ROW'] = true;
				}
				else if ($key === 0)
				{
					unset($this->_tpldata[$blockname][0]['S_FIRST_ROW']);
					$vararray['S_FIRST_ROW'] = true;
				}
	
				// Re-position template blocks
				for ($i = sizeof($this->_tpldata[$blockname]); $i > $key; $i--)
				{
					$this->_tpldata[$blockname][$i] = $this->_tpldata[$blockname][$i-1];
					$this->_tpldata[$blockname][$i]['S_ROW_COUNT'] = $i;
				}
	
				// Insert vararray at given position
				$vararray['S_ROW_COUNT'] = $key;
				$this->_tpldata[$blockname][$key] = $vararray;
	
				return true;
			}
	
			// Which block to change?
			if ($mode == 'change')
			{
				if ($key == sizeof($this->_tpldata[$blockname]))
				{
					$key--;
				}
	
				$this->_tpldata[$blockname][$key] = array_merge($this->_tpldata[$blockname][$key], $vararray);
				return true;
			}
	
			return false;
		}
	
		/**
		* Include a separate template
		* @access private
		*/
		function _tpl_include($filename, $include = true)
		{
			$handle = $filename;
			$this->filename[$handle] = $filename;
			$this->files[$handle] = $this->root . '/' . $filename;
			if ($this->inherit_root)
			{
				$this->files_inherit[$handle] = $this->inherit_root . '/' . $filename;
			}
	
			$filename = $this->_tpl_load($handle);
	
			if ($include)
			{
				global $user;
	
				if ($filename)
				{
					include($filename);
					return;
				}
				eval(' ?>' . $this->compiled_code[$handle] . '<?php ');
			}
		}
	
		/**
		* Include a php-file
		* @access private
		*/
		function _php_include($filename)
		{
			global $phpbb_root_path;
	
			$file = $phpbb_root_path . $filename;
	
			if (!file_exists($file))
			{
				// trigger_error cannot be used here, as the output already started
				echo 'template->_php_include(): File ' . htmlspecialchars($file) . ' does not exist or is empty';
				return;
			}
			include($file);
		}
	
	}
?>