chamilo /common/libraries/plugin/phpbb3/functions_template.php

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<?php
/**
 *
 * @package phpBB3
 * @version $Id: functions_template.php 10064 2009-08-30 11:15:24Z acydburn $
 * @copyright (c) 2005 phpBB Group, sections (c) 2001 ispi of Lincoln Inc
 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
 *
 */

/**
 * @ignore
 */
//if (!defined('IN_PHPBB'))
//{
//	exit;
//}


/**
 * Extension of template class - Functions needed for compiling templates only.
 *
 * psoTFX, phpBB Development Team - Completion of file caching, decompilation
 * routines and implementation of conditionals/keywords and associated changes
 *
 * The interface was inspired by PHPLib templates,  and the template file (formats are
 * quite similar)
 *
 * The keyword/conditional implementation is currently based on sections of code from
 * the Smarty templating engine (c) 2001 ispi of Lincoln, Inc. which is released
 * (on its own and in whole) under the LGPL. Section 3 of the LGPL states that any code
 * derived from an LGPL application may be relicenced under the GPL, this applies
 * to this source
 *
 * DEFINE directive inspired by a request by Cyberalien
 *
 * @package phpBB3
 */
class template_compile
{
    var $template;
    
    // Various storage arrays
    var $block_names = array();
    var $block_else_level = array();

    /**
     * constuctor
     */
    function __construct(&$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);
        
        //		dump($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 if ! 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);
        }
        
        return;
    }
}

?>
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