smarty/libs/Smarty_Compiler.class.php

<?php

/**
 * Project:     Smarty: the PHP compiling template engine
 * File:        Smarty_Compiler.class.php
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * You may contact the authors of Smarty by e-mail at:
 * monte@ispi.net
 * andrei@php.net
 *
 * Or, write to:
 * Monte Ohrt
 * Director of Technology, ispi
 * 237 S. 70th suite 220
 * Lincoln, NE 68510
 *
 * The latest version of Smarty can be obtained from:
 * http://www.phpinsider.com/
 * @link http://www.phpinsider.com/
 * @author Monte Ohrt <monte@ispi.net>
 * @author Andrei Zmievski <andrei@php.net>
 * @version 2.5.0
 * @copyright 2001,2002 ispi of Lincoln, Inc.
 * @package Smarty
 */

/* $Id$ */

class Smarty_Compiler extends Smarty {

    // internal vars
    /**#@+
     * @access private
     */
    var $_sectionelse_stack     =   array();    // keeps track of whether section had 'else' part
    var $_foreachelse_stack     =   array();    // keeps track of whether foreach had 'else' part
    var $_literal_blocks        =   array();    // keeps literal template blocks
    var $_php_blocks            =   array();    // keeps php code blocks
    var $_current_file          =   null;       // the current template being compiled
    var $_current_line_no       =   1;          // line number for error messages
    var $_capture_stack         =   array();    // keeps track of nested capture buffers
    var $_plugin_info           =   array();    // keeps track of plugins to load
    var $_init_smarty_vars      =   false;
	var $_permitted_tokens		=	array('true','false','yes','no','on','off','null');
    var $_db_qstr_regexp		=	null;		// regexps are setup in the constructor
    var $_si_qstr_regexp		=	null;
    var $_qstr_regexp			=	null;
    var $_func_regexp			=	null;
    var $_var_bracket_regexp	=	null;
    var $_dvar_guts_regexp		=	null;
    var $_dvar_regexp			=	null;
    var $_cvar_regexp			=	null;
    var $_svar_regexp			=	null;
    var $_avar_regexp			=	null;
    var $_mod_regexp			=	null;
    var $_var_regexp			=	null;
    var $_parenth_param_regexp	=	null;
	var $_func_call_regexp		=	null;
	var $_obj_ext_regexp		=	null;
	var $_obj_start_regexp		=	null;
	var $_obj_params_regexp		=	null;
	var $_obj_call_regexp		=	null;
    /**#@-*/
	/**
	 * The class constructor.
	 */
    function Smarty_Compiler()
    {
		// matches double quoted strings:
		// "foobar"
		// "foo\"bar"
    	$this->_db_qstr_regexp = '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"';

		// matches single quoted strings:
		// 'foobar'
		// 'foo\'bar'
    	$this->_si_qstr_regexp = '\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\'';

		// matches single or double quoted strings
    	$this->_qstr_regexp = '(?:' . $this->_db_qstr_regexp . '|' . $this->_si_qstr_regexp . ')';

		// matches bracket portion of vars
		// [0]
		// [foo]
		// [$bar]
		$this->_var_bracket_regexp = '\[\$?[\w\.]+\]';
				
		// matches $ vars (not objects):
		// $foo
		// $foo.bar
		// $foo.bar.foobar
		// $foo[0]
		// $foo[$bar]
		// $foo[5][blah]
		// $foo[5].bar[$foobar][4]
		$this->_dvar_guts_regexp = '\w+(?:' . $this->_var_bracket_regexp
				. ')*(?:\.\$?\w+(?:' . $this->_var_bracket_regexp . ')*)*';
		$this->_dvar_regexp = '\$' . $this->_dvar_guts_regexp;

		// matches config vars:
		// #foo#
		// #foobar123_foo#
		$this->_cvar_regexp = '\#\w+\#';

		// matches section vars:
		// %foo.bar%
		$this->_svar_regexp = '\%\w+\.\w+\%';

		// matches all valid variables (no quotes, no modifiers)
		$this->_avar_regexp = '(?:' . $this->_dvar_regexp . '|'
		   . $this->_cvar_regexp . '|' . $this->_svar_regexp . ')';

		// matches valid variable syntax:
		// $foo
		// $foo
		// #foo#
		// #foo#
		// "text"
		// "text"
		$this->_var_regexp = '(?:' . $this->_avar_regexp . '|' . $this->_qstr_regexp . ')';
				
		// matches valid object call (no objects allowed in parameters):
		// $foo->bar
		// $foo->bar()
		// $foo->bar("text")
		// $foo->bar($foo, $bar, "text")
		// $foo->bar($foo, "foo")
		// $foo->bar->foo()
		// $foo->bar->foo->bar()
		$this->_obj_ext_regexp = '\->(?:\$?' . $this->_dvar_guts_regexp . ')';
    	$this->_obj_params_regexp = '\((?:\w+|'
				. $this->_var_regexp . '(?:\s*,\s*(?:(?:\w+|'
				. $this->_var_regexp . ')))*)?\)';		
    	$this->_obj_start_regexp = '(?:' . $this->_dvar_regexp . '(?:' . $this->_obj_ext_regexp . ')+)';
		$this->_obj_call_regexp = '(?:' . $this->_obj_start_regexp . '(?:' . $this->_obj_params_regexp . ')?)';

		// matches valid modifier syntax:
		// |foo
		// |@foo
		// |foo:"bar"
		// |foo:$bar
		// |foo:"bar":$foobar
		// |foo|bar
		// |foo:$foo->bar
		$this->_mod_regexp = '(?:\|@?\w+(?::(?>\w+|'
		   . $this->_obj_call_regexp . '|' . $this->_avar_regexp . '|' . $this->_qstr_regexp .'))*)';		
				
		// matches valid function name:
		// foo123
		// _foo_bar
		$this->_func_regexp = '[a-zA-Z_]\w*';

		// matches valid registered object:
		// foo->bar
		$this->_reg_obj_regexp = '[a-zA-Z_]\w*->[a-zA-Z_]\w*';
				
		// matches valid parameter values:
		// true
		// $foo
		// $foo|bar
		// #foo#
		// #foo#|bar
		// "text"
		// "text"|bar
		// $foo->bar
		$this->_param_regexp = '(?:\s*(?:' . $this->_obj_call_regexp . '|'
		   . $this->_var_regexp  . '|\w+)(?>' . $this->_mod_regexp . '*)\s*)';		
		
		// matches valid parenthesised function parameters:
		// 
		// "text"
		//	$foo, $bar, "text"
		// $foo|bar, "foo"|bar, $foo->bar($foo)|bar
    	$this->_parenth_param_regexp = '(?:\((?:\w+|'
				. $this->_param_regexp . '(?:\s*,\s*(?:(?:\w+|'
				. $this->_param_regexp . ')))*)?\))';
	
		// matches valid function call:
		// foo()
		// foo_bar($foo)
		// _foo_bar($foo,"bar")
		// foo123($foo,$foo->bar(),"foo")
    	$this->_func_call_regexp = '(?:' . $this->_func_regexp . '\s*(?:'
		   . $this->_parenth_param_regexp . '))';		
	}			
			
	/**
	 * compile a template file
	 *
     * sets $template_compiled to the compiled source
	 * @param string $tpl_file
	 * @param string $template_source
	 * @param string $template_compiled
	 */
    function _compile_file($tpl_file, $template_source, &$template_compiled)
    {
        if ($this->security) {
            // do not allow php syntax to be executed unless specified
            if ($this->php_handling == SMARTY_PHP_ALLOW &&
                !$this->security_settings['PHP_HANDLING']) {
                $this->php_handling = SMARTY_PHP_PASSTHRU;
            }
        }

        $this->_load_filters();

        $this->_current_file = $tpl_file;
        $this->_current_line_no = 1;
        $ldq = preg_quote($this->left_delimiter, '!');
        $rdq = preg_quote($this->right_delimiter, '!');

        // run template source through prefilter functions
        if (count($this->_plugins['prefilter']) > 0) {
            foreach ($this->_plugins['prefilter'] as $filter_name => $prefilter) {
                if ($prefilter === false) continue;
                if ($prefilter[3] || function_exists($prefilter[0])) {
                    $template_source = $prefilter[0]($template_source, $this);
                    $this->_plugins['prefilter'][$filter_name][3] = true;
                } else {
                    $this->_trigger_fatal_error("[plugin] prefilter '$filter_name' is not implemented");
                }
            }
        }

        /* Annihilate the comments. */
        $template_source = preg_replace("!({$ldq})\*(.*?)\*({$rdq})!se",
                                        "'\\1*'.str_repeat(\"\n\", substr_count('\\2', \"\n\")) .'*\\3'",
                                        $template_source);

        /* Pull out the literal blocks. */
        preg_match_all("!{$ldq}literal{$rdq}(.*?){$ldq}/literal{$rdq}!s", $template_source, $match);
        $this->_literal_blocks = $match[1];
        $template_source = preg_replace("!{$ldq}literal{$rdq}(.*?){$ldq}/literal{$rdq}!s",
                                        $this->quote_replace($this->left_delimiter.'literal'.$this->right_delimiter), $template_source);

        /* Pull out the php code blocks. */
        preg_match_all("!{$ldq}php{$rdq}(.*?){$ldq}/php{$rdq}!s", $template_source, $match);
        $this->_php_blocks = $match[1];
        $template_source = preg_replace("!{$ldq}php{$rdq}(.*?){$ldq}/php{$rdq}!s",
                                        $this->quote_replace($this->left_delimiter.'php'.$this->right_delimiter), $template_source);

        /* Gather all template tags. */
        preg_match_all("!{$ldq}\s*(.*?)\s*{$rdq}!s", $template_source, $match);
        $template_tags = $match[1];
        /* Split content by template tags to obtain non-template content. */
        $text_blocks = preg_split("!{$ldq}.*?{$rdq}!s", $template_source);
		
        /* loop through text blocks */
        for ($curr_tb = 0, $for_max = count($text_blocks); $curr_tb < $for_max; $curr_tb++) {
            /* match anything resembling php tags */
            if (preg_match_all('!(<\?(?:\w+|=)?|\?>|language\s*=\s*[\"\']?php[\"\']?)!is', $text_blocks[$curr_tb], $sp_match)) {
				/* replace tags with placeholders to prevent recursive replacements */
				$sp_match[1] = array_unique($sp_match[1]);
				usort($sp_match[1], '_smarty_sort_length');
                for ($curr_sp = 0, $for_max2 = count($sp_match[1]); $curr_sp < $for_max2; $curr_sp++) {
					$text_blocks[$curr_tb] = str_replace($sp_match[1][$curr_sp],'%%%SMARTYSP'.$curr_sp.'%%%',$text_blocks[$curr_tb]);
				}
                /* process each one */
                for ($curr_sp = 0, $for_max2 = count($sp_match[0]); $curr_sp < $for_max2; $curr_sp++) {
                    if ($this->php_handling == SMARTY_PHP_PASSTHRU) {
                        /* echo php contents */
                        $text_blocks[$curr_tb] = str_replace('%%%SMARTYSP'.$curr_sp.'%%%', '<?php echo \''.str_replace("'", "\'", $sp_match[1][$curr_sp]).'\'; ?>'."\n", $text_blocks[$curr_tb]);
                    } else if ($this->php_handling == SMARTY_PHP_QUOTE) {
                        /* quote php tags */
                        $text_blocks[$curr_tb] = str_replace('%%%SMARTYSP'.$curr_sp.'%%%', htmlspecialchars($sp_match[1][$curr_sp]), $text_blocks[$curr_tb]);
                    } else if ($this->php_handling == SMARTY_PHP_REMOVE) {
                        /* remove php tags */
                        $text_blocks[$curr_tb] = str_replace('%%%SMARTYSP'.$curr_sp.'%%%', '', $text_blocks[$curr_tb]);
                    } else {
						/* SMARTY_PHP_ALLOW, but echo non php starting tags */
						$sp_match[1][$curr_sp] = preg_replace('%(<\?(?!php|=|$))%i', '<?php echo \'\\1\'?>'."\n", $sp_match[1][$curr_sp]);
						$text_blocks[$curr_tb] = str_replace('%%%SMARTYSP'.$curr_sp.'%%%', $sp_match[1][$curr_sp], $text_blocks[$curr_tb]);
					}
                }
            }
        }

        /* Compile the template tags into PHP code. */
        $compiled_tags = array();
        for ($i = 0, $for_max = count($template_tags); $i < $for_max; $i++) {
            $this->_current_line_no += substr_count($text_blocks[$i], "\n");
            $compiled_tags[] = $this->_compile_tag($template_tags[$i]);
            $this->_current_line_no += substr_count($template_tags[$i], "\n");
        }

        $template_compiled = '';

        /* Interleave the compiled contents and text blocks to get the final result. */
        for ($i = 0, $for_max = count($compiled_tags); $i < $for_max; $i++) {
            $template_compiled .= $text_blocks[$i].$compiled_tags[$i];
        }
        $template_compiled .= $text_blocks[$i];

        /* Reformat data between 'strip' and '/strip' tags, removing spaces, tabs and newlines. */
        if (preg_match_all("!{$ldq}strip{$rdq}.*?{$ldq}/strip{$rdq}!s", $template_compiled, $match)) {
            $strip_tags = $match[0];
            $strip_tags_modified = preg_replace("!{$ldq}/?strip{$rdq}|[\t ]+$|^[\t ]+!m", '', $strip_tags);
            $strip_tags_modified = preg_replace('![\r\n]+!m', '', $strip_tags_modified);
            for ($i = 0, $for_max = count($strip_tags); $i < $for_max; $i++)
                $template_compiled = preg_replace("!{$ldq}strip{$rdq}.*?{$ldq}/strip{$rdq}!s",
                                                  $this->quote_replace($strip_tags_modified[$i]),
                                                  $template_compiled, 1);
        }

        // remove \n from the end of the file, if any
        if ($template_compiled{strlen($template_compiled) - 1} == "\n" ) {
            $template_compiled = substr($template_compiled, 0, -1);
        }

        // run compiled template through postfilter functions
        if (count($this->_plugins['postfilter']) > 0) {
            foreach ($this->_plugins['postfilter'] as $filter_name => $postfilter) {
                if ($postfilter === false) continue;
                if ($postfilter[3] || function_exists($postfilter[0])) {
                    $template_compiled = $postfilter[0]($template_compiled, $this);
                    $this->_plugins['postfilter'][$filter_name][3] = true;
                } else {
                    $this->_trigger_fatal_error("Smarty plugin error: postfilter '$filter_name' is not implemented");
                }
            }
        }

        // put header at the top of the compiled template
        $template_header = "<?php /* Smarty version ".$this->_version.", created on ".strftime("%Y-%m-%d %H:%M:%S")."\n";
        $template_header .= "         compiled from ".$tpl_file." */ ?>\n";

        /* Emit code to load needed plugins. */
        if (count($this->_plugin_info)) {
            $plugins_code = '<?php $this->_load_plugins(array(';
            foreach ($this->_plugin_info as $plugin_type => $plugins) {
                foreach ($plugins as $plugin_name => $plugin_info) {
                    $plugins_code .= "\narray('$plugin_type', '$plugin_name', '$plugin_info[0]', $plugin_info[1], ";
                    $plugins_code .= $plugin_info[2] ? 'true),' : 'false),';
                }
            }
            $plugins_code .= ")); ?>";
            $template_header .= $plugins_code;
            $this->_plugin_info = array();
        }

        if ($this->_init_smarty_vars) {
            $template_header .= "<?php \$this->_assign_smarty_interface(); ?>\n";
            $this->_init_smarty_vars = false;
        }

        $template_compiled = $template_header . $template_compiled;

        return true;
    }

	/**
	 * Compile a template tag
	 *
	 * @param string $template_tag
	 */
    function _compile_tag($template_tag)
    {		
				
        /* Matched comment. */
        if ($template_tag{0} == '*' && $template_tag{strlen($template_tag) - 1} == '*')
            return '';
		
        /* Split tag into two three parts: command, command modifiers and the arguments. */
        if(! preg_match('/^(?:(' . $this->_obj_call_regexp . '|' . $this->_var_regexp
				. '|' . $this->_reg_obj_regexp . '|\/?' . $this->_func_regexp . ')(' . $this->_mod_regexp . '*))
                      (?:\s+(.*))?$
                    /xs', $template_tag, $match)) {
			$this->_syntax_error("unrecognized tag: $template_tag", E_USER_ERROR, __FILE__, __LINE__);
		}

        $tag_command = $match[1];
        $tag_modifier = isset($match[2]) ? $match[2] : null;
        $tag_args = isset($match[3]) ? $match[3] : null;
		
		
        /* If the tag name is a variable or object, we process it. */
        if (preg_match('!^' . $this->_obj_call_regexp . '|' . $this->_var_regexp . '$!', $tag_command)) {
            $_return = $this->_parse_var_props($tag_command . $tag_modifier, $this->_parse_attrs($tag_args));
			if(isset($_tag_attrs['assign'])) {
				return "<?php \$this->assign('" . $this->_dequote($_tag_attrs['assign']) . "', $_return ); ?>\n";  
			} else {
            	return "<?php echo $_return; ?>\n";
			}
		}
		
	    /* If the tag name is a registered object, we process it. */
        if (preg_match('!^' . $this->_reg_obj_regexp . '$!', $tag_command)) {
			return $this->_compile_registered_object_tag($tag_command, $this->_parse_attrs($tag_args), $tag_modifier);
		}

        switch ($tag_command) {
            case 'include':
                return $this->_compile_include_tag($tag_args);

            case 'include_php':
                return $this->_compile_include_php_tag($tag_args);

            case 'if':
                return $this->_compile_if_tag($tag_args);

            case 'else':
                return '<?php else: ?>';

            case 'elseif':
                return $this->_compile_if_tag($tag_args, true);

            case '/if':
                return '<?php endif; ?>';

            case 'capture':
                return $this->_compile_capture_tag(true, $tag_args);

            case '/capture':
                return $this->_compile_capture_tag(false);

            case 'ldelim':
                return $this->left_delimiter;

            case 'rdelim':
                return $this->right_delimiter;

            case 'section':
                array_push($this->_sectionelse_stack, false);
                return $this->_compile_section_start($tag_args);

            case 'sectionelse':
                $this->_sectionelse_stack[count($this->_sectionelse_stack)-1] = true;
                return "<?php endfor; else: ?>";

            case '/section':
                if (array_pop($this->_sectionelse_stack))
                    return "<?php endif; ?>";
                else
                    return "<?php endfor; endif; ?>";

            case 'foreach':
                array_push($this->_foreachelse_stack, false);
                return $this->_compile_foreach_start($tag_args);
                break;

            case 'foreachelse':
                $this->_foreachelse_stack[count($this->_foreachelse_stack)-1] = true;
                return "<?php endforeach; else: ?>";

            case '/foreach':
                if (array_pop($this->_foreachelse_stack))
                    return "<?php endif; ?>";
                else
                    return "<?php endforeach; endif; ?>";

            case 'config_load':
                return $this->_compile_config_load_tag($tag_args);

            case 'strip':
            case '/strip':
                return $this->left_delimiter.$tag_command.$this->right_delimiter;

            case 'literal':
                list (,$literal_block) = each($this->_literal_blocks);
                $this->_current_line_no += substr_count($literal_block, "\n");
                return "<?php echo '".str_replace("'", "\'", str_replace("\\", "\\\\", $literal_block))."'; ?>\n";

            case 'php':
                if ($this->security && !$this->security_settings['PHP_TAGS']) {
                    $this->_syntax_error("(secure mode) php tags not permitted", E_USER_WARNING, __FILE__, __LINE__);
                    return;
                }
                list (,$php_block) = each($this->_php_blocks);
                $this->_current_line_no += substr_count($php_block, "\n");
                return '<?php '.$php_block.' ?>';

            case 'insert':
                return $this->_compile_insert_tag($tag_args);

            default:
                if ($this->_compile_compiler_tag($tag_command, $tag_args, $output)) {
                    return $output;
                } else if ($this->_compile_block_tag($tag_command, $tag_args, $tag_modifier, $output)) {
                    return $output;
                } else {
                    return $this->_compile_custom_tag($tag_command, $tag_args, $tag_modifier);
                }
        }
    }


	/**
	 * compile the custom compiler tag
	 *
     * sets $output to the compiled custom compiler tag
	 * @param string $tag_command
	 * @param string $tag_args
	 * @param string $output
	 */
    function _compile_compiler_tag($tag_command, $tag_args, &$output)
    {
        $found = false;
        $have_function = true;

        /*
         * First we check if the compiler function has already been registered
         * or loaded from a plugin file.
         */
        if (isset($this->_plugins['compiler'][$tag_command])) {
            $found = true;
            $plugin_func = $this->_plugins['compiler'][$tag_command][0];
            if (!function_exists($plugin_func)) {
                $message = "compiler function '$tag_command' is not implemented";
                $have_function = false;
            }
        }
        /*
         * Otherwise we need to load plugin file and look for the function
         * inside it.
         */
        else if ($plugin_file = $this->_get_plugin_filepath('compiler', $tag_command)) {
            $found = true;

            include_once $plugin_file;

            $plugin_func = 'smarty_compiler_' . $tag_command;
            if (!function_exists($plugin_func)) {
                $message = "plugin function $plugin_func() not found in $plugin_file\n";
                $have_function = false;
            } else {
                $this->_plugins['compiler'][$tag_command] = array($plugin_func, null, null);
            }
        }

        /*
         * True return value means that we either found a plugin or a
         * dynamically registered function. False means that we didn't and the
         * compiler should now emit code to load custom function plugin for this
         * tag.
         */
        if ($found) {
            if ($have_function) {
                $output = '<?php ' . $plugin_func($tag_args, $this) . ' ?>';
            } else {
                $this->_syntax_error($message, E_USER_WARNING, __FILE__, __LINE__);
            }
            return true;
        } else {
            return false;
        }
    }


	/**
	 * compile block function tag
	 *
     * sets $output to compiled block function tag
	 * @param string $tag_command
	 * @param string $tag_args
	 * @param string $tag_modifier
	 * @param string $output
	 */
    function _compile_block_tag($tag_command, $tag_args, $tag_modifier, &$output)
    {
        if ($tag_command{0} == '/') {
            $start_tag = false;
            $tag_command = substr($tag_command, 1);
        } else
            $start_tag = true;

        $found = false;
        $have_function = true;

        /*
         * First we check if the block function has already been registered
         * or loaded from a plugin file.
         */
        if (isset($this->_plugins['block'][$tag_command])) {
            $found = true;
            $plugin_func = $this->_plugins['block'][$tag_command][0];
            if (!function_exists($plugin_func)) {
                $message = "block function '$tag_command' is not implemented";
                $have_function = false;
            }
        }
        /*
         * Otherwise we need to load plugin file and look for the function
         * inside it.
         */
        else if ($plugin_file = $this->_get_plugin_filepath('block', $tag_command)) {
            $found = true;

            include_once $plugin_file;

            $plugin_func = 'smarty_block_' . $tag_command;
            if (!function_exists($plugin_func)) {
                $message = "plugin function $plugin_func() not found in $plugin_file\n";
                $have_function = false;
            } else {
                $this->_plugins['block'][$tag_command] = array($plugin_func, null, null);
            }
        }

        if (!$found) {
            return false;
        } else if (!$have_function) {
            $this->_syntax_error($message, E_USER_WARNING, __FILE__, __LINE__);
            return true;
        }

        /*
         * Even though we've located the plugin function, compilation
         * happens only once, so the plugin will still need to be loaded
         * at runtime for future requests.
         */
        $this->_add_plugin('block', $tag_command);

        if ($start_tag) {
            $arg_list = array();
            $attrs = $this->_parse_attrs($tag_args);
            foreach ($attrs as $arg_name => $arg_value) {
                if (is_bool($arg_value))
                    $arg_value = $arg_value ? 'true' : 'false';
                $arg_list[] = "'$arg_name' => $arg_value";
            }

            $output = "<?php \$this->_tag_stack[] = array('$tag_command', array(".implode(',', (array)$arg_list).")); \$this->_plugins['block']['$tag_command'][0](array(".implode(',', (array)$arg_list)."), null, \$this); ob_start(); ?>";
        } else {
            $output = "<?php \$this->_block_content = ob_get_contents(); ob_end_clean(); ";
			$out_tag_text = "\$this->_plugins['block']['$tag_command'][0](\$this->_tag_stack[count(\$this->_tag_stack)-1][1], \$this->_block_content, \$this)";
			if($tag_modifier != '') {
				$this->_parse_modifiers($out_tag_text, $tag_modifier);
			}
			$output .= 'echo ' . $out_tag_text . ';';
			$output .= " array_pop(\$this->_tag_stack); ?>";
        }

        return true;
    }


	/**
	 * compile custom function tag
	 *
	 * @param string $tag_command
	 * @param string $tag_args
	 * @param string $tag_modifier
	 */
    function _compile_custom_tag($tag_command, $tag_args, $tag_modifier)
    {
        $this->_add_plugin('function', $tag_command);

        $arg_list = array();
        $attrs = $this->_parse_attrs($tag_args);

        foreach ($attrs as $arg_name => $arg_value) {
            if (is_bool($arg_value))
                $arg_value = $arg_value ? 'true' : 'false';
            if (is_null($arg_value))
                $arg_value = 'null';
            $arg_list[] = "'$arg_name' => $arg_value";
        }
		
		$return = "\$this->_plugins['function']['$tag_command'][0](array(".implode(',', (array)$arg_list)."), \$this)";
		
		if($tag_modifier != '') {
			$this->_parse_modifiers($return, $tag_modifier);
		}
		
        return '<?php echo ' . $return . " ; ?>\n";
    }

	/**
	 * compile a registered object tag
	 *
	 * @param string $tag_command
	 * @param array $attrs
	 * @param string $tag_modifier
	 */
    function _compile_registered_object_tag($tag_command, $attrs, $tag_modifier)
    {
		list($object, $obj_comp) = explode('->', $tag_command);

        $arg_list = array();
		if(count($attrs)) {
			$_assign_var = false;
        	foreach ($attrs as $arg_name => $arg_value) {
				if($arg_name == 'assign') {
					$_assign_var = $arg_value;
					unset($attrs['assign']);
					continue;
				}
            	if (is_bool($arg_value))
                	$arg_value = $arg_value ? 'true' : 'false';
            	$arg_list[] = "'$arg_name' => $arg_value";
        	}
		}
				
		if(!is_object($this->_reg_objects[$object][0])) {
			$this->_trigger_fatal_error("registered '$object' is not an object");
		} elseif(!empty($this->_reg_objects[$object][1]) && !in_array($obj_comp, $this->_reg_objects[$object][1])) {
			$this->_trigger_fatal_error("'$obj_comp' is not a registered component of object '$object'");
		} elseif(method_exists($this->_reg_objects[$object][0], $obj_comp)) {
			// method
			if($this->_reg_objects[$object][2]) {
				// smarty object argument format
				$return = "\$this->_reg_objects['$object'][0]->$obj_comp(array(".implode(',', (array)$arg_list)."), \$this)";
			} else {
				// traditional argument format
				$return = "\$this->_reg_objects['$object'][0]->$obj_comp(".implode(',', array_values($attrs)).")";
			}
		} else {
			// property
			$return = "\$this->_reg_objects['$object'][0]->$obj_comp";
		}
		
		if($tag_modifier != '') {
			$this->_parse_modifiers($return, $tag_modifier);
		}
		
		if($_assign_var) {
			return "<?php \$this->assign('" . $this->_dequote($_assign_var) ."',  $return); ?>\n";
		} else {
        	return '<?php echo ' . $return . "; ?>\n";
		}
    }
	
	

	/**
	 * Compile {insert ...} tag
	 *
	 * @param string $tag_args
	 */
    function _compile_insert_tag($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $name = $this->_dequote($attrs['name']);

        if (empty($name)) {
            $this->_syntax_error("missing insert name", E_USER_ERROR, __FILE__, __LINE__);
        }

        if (!empty($attrs['script'])) {
            $delayed_loading = true;
        } else {
            $delayed_loading = false;			
		}

        foreach ($attrs as $arg_name => $arg_value) {
            if (is_bool($arg_value))
                $arg_value = $arg_value ? 'true' : 'false';
            $arg_list[] = "'$arg_name' => $arg_value";
        }

        $this->_add_plugin('insert', $name, $delayed_loading);

        return "<?php echo \$this->_run_insert_handler(array(".implode(', ', (array)$arg_list).")); ?>\n";
    }


	/**
	 * Compile {config_load ...} tag
	 *
	 * @param string $tag_args
	 */
    function _compile_config_load_tag($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);

        if (empty($attrs['file'])) {
            $this->_syntax_error("missing 'file' attribute in config_load tag", E_USER_ERROR, __FILE__, __LINE__);
        }

        if (empty($attrs['section'])) {
            $attrs['section'] = 'null';
        }

        if (isset($attrs['scope'])) {
			$scope = @$this->_dequote($attrs['scope']);
            if ($scope != 'local' &&
                $scope != 'parent' &&
                $scope != 'global') {
                $this->_syntax_error("invalid 'scope' attribute value", E_USER_ERROR, __FILE__, __LINE__);
            }
        } else {
            if (isset($attrs['global']) && $attrs['global'])
                $scope = 'parent';
            else
                $scope = 'local';
        }

        return '<?php $this->config_load(' . $attrs['file'] . ', ' . $attrs['section'] . ", '$scope'); ?>";
    }


	/**
	 * Compile {include ...} tag
	 *
	 * $param string $tag_args
	 */
    function _compile_include_tag($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $arg_list = array();

        if (empty($attrs['file'])) {
            $this->_syntax_error("missing 'file' attribute in include tag", E_USER_ERROR, __FILE__, __LINE__);
        }

        foreach ($attrs as $arg_name => $arg_value) {
            if ($arg_name == 'file') {
                $include_file = $arg_value;
                continue;
            } else if ($arg_name == 'assign') {
                $assign_var = $arg_value;
                continue;
            }
            if (is_bool($arg_value))
                $arg_value = $arg_value ? 'true' : 'false';
            $arg_list[] = "'$arg_name' => $arg_value";
        }

        $output = '<?php ';

        if (isset($assign_var)) {
			$output .= "ob_start();\n";
        }

        $output .=  
            "\$_smarty_tpl_vars = \$this->_tpl_vars;\n" .
            "\$this->_smarty_include(".$include_file.", array(".implode(',', (array)$arg_list)."));\n" .
            "\$this->_tpl_vars = \$_smarty_tpl_vars;\n" .
            "unset(\$_smarty_tpl_vars);\n";

        if (isset($assign_var)) {
			$output .= "\$this->assign(" . $assign_var . ", ob_get_contents()); ob_end_clean();\n";
        }

        $output .= ' ?>';

		return $output;

    }

	/**
	 * Compile {include ...} tag
	 *
	 * @param string $tag_args
	 */
    function _compile_include_php_tag($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);

        if (empty($attrs['file'])) {
            $this->_syntax_error("missing 'file' attribute in include_php tag", E_USER_ERROR, __FILE__, __LINE__);
        }

        $assign_var = $this->_dequote($attrs['assign']);		
		$once_var = ( $attrs['once'] == 'false' ) ? 'false' : 'true';
		
    	foreach($attrs as $arg_name => $arg_value) {
        	if($arg_name != 'file' AND $arg_name != 'once' AND $arg_name != 'assign') {
            	if(is_bool($arg_value))
                	$arg_value = $arg_value ? 'true' : 'false';
            	$arg_list[] = "'$arg_name' => $arg_value";
        	}
    	}

    	$output =
        	"<?php \$this->_smarty_include_php($attrs[file], '$assign_var', $once_var, " .
        	"array(".implode(',', (array)$arg_list).")); ?>";
				
		return $output;
    }
	

	/**
	 * Compile {section ...} tag
	 *
	 * @param string $tag_args
	 */
    function _compile_section_start($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $arg_list = array();

        $output = '<?php ';
        $section_name = $attrs['name'];
        if (empty($section_name)) {
            $this->_syntax_error("missing section name", E_USER_ERROR, __FILE__, __LINE__);
        }

        $output .= "if (isset(\$this->_sections[$section_name])) unset(\$this->_sections[$section_name]);\n";
        $section_props = "\$this->_sections[$section_name]";

        foreach ($attrs as $attr_name => $attr_value) {
            switch ($attr_name) {
                case 'loop':
                    $output .= "{$section_props}['loop'] = is_array($attr_value) ? count($attr_value) : max(0, (int)$attr_value);\n";
                    break;

                case 'show':
                    if (is_bool($attr_value))
                        $show_attr_value = $attr_value ? 'true' : 'false';
                    else
                        $show_attr_value = "(bool)$attr_value";
                    $output .= "{$section_props}['show'] = $show_attr_value;\n";
                    break;

                case 'name':
                    $output .= "{$section_props}['$attr_name'] = $attr_value;\n";
                    break;

                case 'max':
                case 'start':
                    $output .= "{$section_props}['$attr_name'] = (int)$attr_value;\n";
                    break;

                case 'step':
                    $output .= "{$section_props}['$attr_name'] = ((int)$attr_value) == 0 ? 1 : (int)$attr_value;\n";
                    break;

                default:
                    $this->_syntax_error("unknown section attribute - '$attr_name'", E_USER_ERROR, __FILE__, __LINE__);
                    break;
            }
        }

        if (!isset($attrs['show']))
            $output .= "{$section_props}['show'] = true;\n";

        if (!isset($attrs['loop']))
            $output .= "{$section_props}['loop'] = 1;\n";

        if (!isset($attrs['max']))
            $output .= "{$section_props}['max'] = {$section_props}['loop'];\n";
        else
            $output .= "if ({$section_props}['max'] < 0)\n" .
                       "    {$section_props}['max'] = {$section_props}['loop'];\n";

        if (!isset($attrs['step']))
            $output .= "{$section_props}['step'] = 1;\n";

        if (!isset($attrs['start']))
            $output .= "{$section_props}['start'] = {$section_props}['step'] > 0 ? 0 : {$section_props}['loop']-1;\n";
        else {
            $output .= "if ({$section_props}['start'] < 0)\n" .
                       "    {$section_props}['start'] = max({$section_props}['step'] > 0 ? 0 : -1, {$section_props}['loop'] + {$section_props}['start']);\n" .
                       "else\n" .
                       "    {$section_props}['start'] = min({$section_props}['start'], {$section_props}['step'] > 0 ? {$section_props}['loop'] : {$section_props}['loop']-1);\n";
        }

        $output .= "if ({$section_props}['show']) {\n";
        if (!isset($attrs['start']) && !isset($attrs['step']) && !isset($attrs['max'])) {
            $output .= "    {$section_props}['total'] = {$section_props}['loop'];\n";
        } else {
            $output .= "    {$section_props}['total'] = min(ceil(({$section_props}['step'] > 0 ? {$section_props}['loop'] - {$section_props}['start'] : {$section_props}['start']+1)/abs({$section_props}['step'])), {$section_props}['max']);\n";
        }
        $output .= "    if ({$section_props}['total'] == 0)\n" .
                   "        {$section_props}['show'] = false;\n" .
                   "} else\n" .
                   "    {$section_props}['total'] = 0;\n";

        $output .= "if ({$section_props}['show']):\n";
        $output .= "
            for ({$section_props}['index'] = {$section_props}['start'], {$section_props}['iteration'] = 1;
                 {$section_props}['iteration'] <= {$section_props}['total'];
                 {$section_props}['index'] += {$section_props}['step'], {$section_props}['iteration']++):\n";
        $output .= "{$section_props}['rownum'] = {$section_props}['iteration'];\n";
        $output .= "{$section_props}['index_prev'] = {$section_props}['index'] - {$section_props}['step'];\n";
        $output .= "{$section_props}['index_next'] = {$section_props}['index'] + {$section_props}['step'];\n";
        $output .= "{$section_props}['first']      = ({$section_props}['iteration'] == 1);\n";
        $output .= "{$section_props}['last']       = ({$section_props}['iteration'] == {$section_props}['total']);\n";

        $output .= "?>";

        return $output;
    }

    
	/**
	 * Compile {foreach ...} tag.
	 *
	 * @param string $tag_args
	 */
    function _compile_foreach_start($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $arg_list = array();

        if (empty($attrs['from'])) {
            $this->_syntax_error("missing 'from' attribute", E_USER_ERROR, __FILE__, __LINE__);
        }

        if (empty($attrs['item'])) {
            $this->_syntax_error("missing 'item' attribute", E_USER_ERROR, __FILE__, __LINE__);
        }

        $from = $attrs['from'];
        $item = $this->_dequote($attrs['item']);
        if (isset($attrs['name']))
            $name = $attrs['name'];

        $output = '<?php ';
        if (isset($name)) {
            $output .= "if (isset(\$this->_foreach[$name])) unset(\$this->_foreach[$name]);\n";
            $foreach_props = "\$this->_foreach[$name]";
        }

        $key_part = '';

        foreach ($attrs as $attr_name => $attr_value) {
            switch ($attr_name) {
                case 'key':
                    $key  = $this->_dequote($attrs['key']);
                    $key_part = "\$this->_tpl_vars['$key'] => ";
                    break;

                case 'name':
                    $output .= "{$foreach_props}['$attr_name'] = $attr_value;\n";
                    break;
            }
        }

        if (isset($name)) {
            $output .= "{$foreach_props}['total'] = count((array)$from);\n";
            $output .= "{$foreach_props}['show'] = {$foreach_props}['total'] > 0;\n";
            $output .= "if ({$foreach_props}['show']):\n";
            $output .= "{$foreach_props}['iteration'] = 0;\n";
            $output .= "    foreach ((array)$from as $key_part\$this->_tpl_vars['$item']):\n";
            $output .= "        {$foreach_props}['iteration']++;\n";
            $output .= "        {$foreach_props}['first'] = ({$foreach_props}['iteration'] == 1);\n";
            $output .= "        {$foreach_props}['last']  = ({$foreach_props}['iteration'] == {$foreach_props}['total']);\n";
        } else {
            $output .= "if (count((array)$from)):\n";
            $output .= "    foreach ((array)$from as $key_part\$this->_tpl_vars['$item']):\n";
        }
        $output .= '?>';

        return $output;
    }


	/**
	 * Compile {capture} .. {/capture} tags
	 *
	 * @param boolean $start true if this is the {capture} tag
	 * @param string $tag_args
	 */
    function _compile_capture_tag($start, $tag_args = '')
    {
        $attrs = $this->_parse_attrs($tag_args);

        if ($start) {
            if (isset($attrs['name']))
                $buffer = $attrs['name'];
            else
                $buffer = "'default'";

            $output = "<?php ob_start(); ?>";
            $this->_capture_stack[] = $buffer;
        } else {
            $buffer = array_pop($this->_capture_stack);
            $output = "<?php \$this->_smarty_vars['capture'][$buffer] = ob_get_contents(); ob_end_clean(); ?>";
        }

        return $output;
    }

	/**
	 * Compile {if ...} tag
	 *
	 * @param string $tag_args
	 * @param boolean $elseif if true, uses elseif instead of if
	 */
    function _compile_if_tag($tag_args, $elseif = false)
    {

        /* Tokenize args for 'if' tag. */
        preg_match_all('/(?>
				' . $this->_obj_call_regexp . '(?:' . $this->_mod_regexp . '*)? | # valid object call
				' . $this->_var_regexp . '(?:' . $this->_mod_regexp . '*)?	| # var or quoted string
				\-?\d+(?:\.\d+)?|\.\d+|!==|===|==|!=|<>|<<|>>|<=|>=|\&\&|\|\||\(|\)|,|\!|\^|=|\&|\~|<|>|\||\%|\+|\-|\/|\*|\@	| # valid non-word token
				\b\w+\b														| # valid word token
				\S+                                                           # anything else
				)/x', $tag_args, $match);
				
        $tokens = $match[0];
				
		// make sure we have balanced parenthesis
		$token_count = array_count_values($tokens);
		if(isset($token_count['(']) && $token_count['('] != $token_count[')']) {
			$this->_syntax_error("unbalanced parenthesis in if statement", E_USER_ERROR, __FILE__, __LINE__);
		}
												
        $is_arg_stack = array();

        for ($i = 0; $i < count($tokens); $i++) {

            $token = &$tokens[$i];
			
            switch (strtolower($token)) {
                case '!':
                case '%':
                case '!==':
                case '==':
                case '===':
                case '>':
                case '<':
                case '!=':
                case '<>':
                case '<<':
                case '>>':
                case '<=':
                case '>=':
                case '&&':
                case '||':
				case '|':
				case '^':
				case '&':
				case '~':
				case ')':
				case ',':
				case '+':
				case '-':
				case '*':
				case '/':
				case '@':
					break;					

                case 'eq':
                    $token = '==';
                    break;

                case 'ne':
                case 'neq':
                    $token = '!=';
                    break;

                case 'lt':
                    $token = '<';
                    break;

                case 'le':
                case 'lte':
                    $token = '<=';
                    break;

                case 'gt':
                    $token = '>';
                    break;

                case 'ge':
                case 'gte':
                    $token = '>=';
                    break;

                case 'and':
                    $token = '&&';
                    break;

                case 'or':
                    $token = '||';
                    break;

                case 'not':
                    $token = '!';
                    break;

                case 'mod':
                    $token = '%';
                    break;

                case '(':
                    array_push($is_arg_stack, $i);
                    break;
					
                case 'is':
                    /* If last token was a ')', we operate on the parenthesized
                       expression. The start of the expression is on the stack.
                       Otherwise, we operate on the last encountered token. */
                    if ($tokens[$i-1] == ')')
                        $is_arg_start = array_pop($is_arg_stack);
                    else
                        $is_arg_start = $i-1;
                    /* Construct the argument for 'is' expression, so it knows
                       what to operate on. */
                    $is_arg = implode(' ', array_slice($tokens, $is_arg_start, $i - $is_arg_start));
					
                    /* Pass all tokens from next one until the end to the
                       'is' expression parsing function. The function will
                       return modified tokens, where the first one is the result
                       of the 'is' expression and the rest are the tokens it
                       didn't touch. */					
                    $new_tokens = $this->_parse_is_expr($is_arg, array_slice($tokens, $i+1));
										
                    /* Replace the old tokens with the new ones. */
                    array_splice($tokens, $is_arg_start, count($tokens), $new_tokens);

                    /* Adjust argument start so that it won't change from the
                       current position for the next iteration. */
                    $i = $is_arg_start;
                    break;
					
                default:
					if(preg_match('!^' . $this->_func_regexp . '$!', $token) ) {
							// function call	
                    		if($this->security &&
                    		   !in_array($token, $this->security_settings['IF_FUNCS'])) {
                        		$this->_syntax_error("(secure mode) '$token' not allowed in if statement", E_USER_ERROR, __FILE__, __LINE__);
							}							
					} elseif(preg_match('!^' . $this->_obj_call_regexp . '|' . $this->_var_regexp . '(?:' . $this->_mod_regexp . '*)$!', $token)) {
						// object or variable
        				$token = $this->_parse_var_props($token);
					} elseif(is_numeric($token)) {
						// number, skip it
					} else {
                		$this->_syntax_error("unidentified token '$token'", E_USER_ERROR, __FILE__, __LINE__);
					}
                    break;
            }
        }
				
        if ($elseif)
            return '<?php elseif ('.implode(' ', $tokens).'): ?>';
        else
            return '<?php if ('.implode(' ', $tokens).'): ?>';
    }


	/**
	 * Parse is expression
	 *
	 * @param string $is_arg
	 * @param array $tokens
	 */
    function _parse_is_expr($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) % " . $this->_parse_var_props($expr_arg) . ")";
                } else
                    $expr = "!($is_arg % 2)";
                break;

            case 'odd':
                if (@$tokens[$expr_end] == 'by') {
                    $expr_end++;
                    $expr_arg = $tokens[$expr_end++];
                    $expr = "(($is_arg / $expr_arg) % ". $this->_parse_var_props($expr_arg) . ")";
                } else
                    $expr = "($is_arg % 2)";
                break;

            case 'div':
                if (@$tokens[$expr_end] == 'by') {
                    $expr_end++;
                    $expr_arg = $tokens[$expr_end++];
                    $expr = "!($is_arg % " . $this->_parse_var_props($expr_arg) . ")";
                } else {
                    $this->_syntax_error("expecting 'by' after 'div'", E_USER_ERROR, __FILE__, __LINE__);
                }
                break;

            default:
                $this->_syntax_error("unknown 'is' expression - '$expr_type'", E_USER_ERROR, __FILE__, __LINE__);
                break;
        }

        if ($negate_expr) {
            $expr = "!($expr)";
        }
		
        array_splice($tokens, 0, $expr_end, $expr);		
		
        return $tokens;
    }


	/**
	 * Parse attribute string
	 *
	 * @param string $tag_args
	 * @param true $quote unused?
	 */
    function _parse_attrs($tag_args, $quote = true)
    {
				
        /* Tokenize tag attributes. */
        preg_match_all('/(?:' . $this->_obj_call_regexp . '|' . $this->_qstr_regexp . ' | (?>[^"\'=\s]+)
                         )+ |
                         [=]
                        /x', $tag_args, $match);
        $tokens       = $match[0];		
						
        $attrs = array();
        /* Parse state:
            0 - expecting attribute name
            1 - expecting '='
            2 - expecting attribute value (not '=') */
        $state = 0;
				
        foreach ($tokens as $token) {
            switch ($state) {
                case 0:
                    /* If the token is a valid identifier, we set attribute name
                       and go to state 1. */
                    if (preg_match('!^\w+$!', $token)) {
                        $attr_name = $token;
                        $state = 1;
                    } else
                        $this->_syntax_error("invalid attribute name: '$token'", E_USER_ERROR, __FILE__, __LINE__);
                    break;

                case 1:
                    /* If the token is '=', then we go to state 2. */
                    if ($token == '=') {
                        $state = 2;
                    } else
                        $this->_syntax_error("expecting '=' after attribute name '$last_token'", E_USER_ERROR, __FILE__, __LINE__);
                    break;

                case 2:
                    /* If token is not '=', we set the attribute value and go to
                       state 0. */
                    if ($token != '=') {
                        /* We booleanize the token if it's a non-quoted possible
                           boolean value. */
                        if (preg_match('!^(on|yes|true)$!', $token)) {
                            $token = 'true';
						} else if (preg_match('!^(off|no|false)$!', $token)) {
                            $token = 'false';
						} else if ($token == 'null') {
                            $token = 'null';
						} else if (preg_match('!^-?[0-9]+$!', $token)) {
                            /* treat integer literally */
						} else if (!preg_match('!^' . $this->_obj_call_regexp . '|' . $this->_var_regexp . '(?:' . $this->_mod_regexp . ')*$!', $token)) {
                        	/* treat as a string, double-quote it escaping quotes */
                            $token = '"'.addslashes($token).'"';
						}

                        $attrs[$attr_name] = $token;
                        $state = 0;
                    } else
                        $this->_syntax_error("'=' cannot be an attribute value", E_USER_ERROR, __FILE__, __LINE__);
                    break;
            }
			$last_token = $token;
        }

		if($state != 0) {
			if($state == 1) {
				$this->_syntax_error("expecting '=' after attribute name '$last_token'", E_USER_ERROR, __FILE__, __LINE__);				
			} else {
				$this->_syntax_error("missing attribute value", E_USER_ERROR, __FILE__, __LINE__);								
			}
		}
		
        $this->_parse_vars_props($attrs);
		
        return $attrs;
    }

	/**
	 * compile multiple variables and section properties tokens into
	 * PHP code
	 *
	 * @param array $tokens
	 */
    function _parse_vars_props(&$tokens)
    {
		foreach($tokens as $key => $val) {			
    		$tokens[$key] = $this->_parse_var_props($val);
		}
	}
		
	/**
	 * compile single variable and section properties token into
	 * PHP code
	 *
	 * @param string $val
	 * @param string $tag_attrs
	 */
    function _parse_var_props($val, $tag_attrs = null)
    {					

		$val = trim($val);

        if(preg_match('!^(' . $this->_obj_call_regexp . '|' . $this->_dvar_regexp . ')(?:' . $this->_mod_regexp . '*)$!', $val)) {
				// $ variable or object
                return $this->_parse_var($val);
			}			
        elseif(preg_match('!^' . $this->_db_qstr_regexp . '(?:' . $this->_mod_regexp . '*)$!', $val)) {
				// double quoted text
				preg_match('!^(' . $this->_db_qstr_regexp . ')('. $this->_mod_regexp . '*)$!', $val, $match);
                $return = $this->_expand_quoted_text($match[1]);
				if($match[2] != '') {
					$this->_parse_modifiers($return, $match[2]);
				}
				return $return;
			}			
        elseif(preg_match('!^' . $this->_si_qstr_regexp . '(?:' . $this->_mod_regexp . '*)$!', $val)) {
				// single quoted text
				preg_match('!^(' . $this->_si_qstr_regexp . ')('. $this->_mod_regexp . '*)$!', $val, $match);
				if($match[2] != '') {
					$this->_parse_modifiers($match[1], $match[2]);
                	return $match[1];
				}	
			}			
        elseif(preg_match('!^' . $this->_cvar_regexp . '(?:' . $this->_mod_regexp . '*)$!', $val)) {
				// config var
                return $this->_parse_conf_var($val);
			}			
        elseif(preg_match('!^' . $this->_svar_regexp . '(?:' . $this->_mod_regexp . '*)$!', $val)) {
				// section var
                return $this->_parse_section_prop($val);
			}
		elseif(!in_array($val, $this->_permitted_tokens) && !is_numeric($val)) {
			// literal string
			return $this->_expand_quoted_text('"' . $val .'"');
		}
		return $val;
    }

	/**
	 * expand quoted text with embedded variables
	 *
	 * @param string $var_expr
	 */
    function _expand_quoted_text($var_expr)
    {
		// if contains unescaped $, expand it
		if(preg_match_all('%(?:\`(?<!\\\\)\$' . $this->_dvar_guts_regexp . '\`)|(?:(?<!\\\\)\$\w+(\[[a-zA-Z0-9]+\])*)%', $var_expr, $_match)) {
			$_match = $_match[0];
			rsort($_match);
			reset($_match);
			foreach($_match as $_var) {
                $var_expr = str_replace ($_var, '".' . $this->_parse_var(str_replace('`','',$_var)) . '."', $var_expr);
			}
            $_return = preg_replace('%\.""|(?<!\\\\)""\.%', '', $var_expr);
		} else {
			$_return = $var_expr;
		}
		// replace double quoted literal string with single quotes
		$_return = preg_replace('!^"([\s\w]+)"$!',"'\\1'",$_return);
		return $_return;
	}
	
	/**
	 * parse variable expression into PHP code
	 *
	 * @param string $var_expr
	 */
    function _parse_var($var_expr)
    {
		preg_match('!(' . $this->_obj_call_regexp . '|' . $this->_var_regexp . ')(' . $this->_mod_regexp . '*)$!', $var_expr, $match);
						
        $var_ref = substr($match[1],1);
        $modifiers = $match[2];
						
		if(!empty($this->default_modifiers) && !preg_match('!(^|\|)smarty:nodefaults($|\|)!',$modifiers)) {
			$_default_mod_string = implode('|',(array)$this->default_modifiers);
			$modifiers = empty($modifiers) ? $_default_mod_string : $_default_mod_string . '|' . $modifiers;
		}

		// get [foo] and .foo and ->foo and (...) pieces			
        preg_match_all('!(?:^\w+)|' . $this->_obj_params_regexp . '|(?:' . $this->_var_bracket_regexp . ')|->\w+|\.\$?\w+|\S+!', $var_ref, $match);		
				
        $indexes = $match[0];
        $var_name = array_shift($indexes);
		
        /* Handle $smarty.* variable references as a special case. */
        if ($var_name == 'smarty') {
            /*
             * If the reference could be compiled, use the compiled output;
             * otherwise, fall back on the $smarty variable generated at
             * run-time.
             */
            if (($smarty_ref = $this->_compile_smarty_ref($indexes)) !== null) {
                $output = $smarty_ref;
            } else {
                $var_name = substr(array_shift($indexes), 1);
                $output = "\$this->_smarty_vars['$var_name']";
            }
        } else {
            $output = "\$this->_tpl_vars['$var_name']";
        }
		
        foreach ($indexes as $index) {			
            if ($index{0} == '[') {
                $index = substr($index, 1, -1);
                if (is_numeric($index)) {
                    $output .= "[$index]";
                } elseif ($index{0} == '$') {
                    $output .= "[\$this->_tpl_vars['" . substr($index, 1) . "']]";
                } else {
                    $parts = explode('.', $index);
                    $section = $parts[0];
                    $section_prop = isset($parts[1]) ? $parts[1] : 'index';
                    $output .= "[\$this->_sections['$section']['$section_prop']]";
                }
            } else if ($index{0} == '.') {
                if ($index{1} == '$')
                    $output .= "[\$this->_tpl_vars['" . substr($index, 2) . "']]";
                else
                    $output .= "['" . substr($index, 1) . "']";
            } else if (substr($index,0,2) == '->') {
				if(substr($index,2,2) == '__') {
					$this->_syntax_error('call to internal object members is not allowed', E_USER_ERROR, __FILE__, __LINE__);
				} elseif($this->security && substr($index,2,1) == '_') {
					$this->_syntax_error('(secure) call to private object member is not allowed', E_USER_ERROR, __FILE__, __LINE__);
				}
                $output .= $index;
			} elseif ($index{0} == '(') {
				$index = $this->_parse_parenth_args($index);
                $output .= $index;
            } else {
                $output .= $index;
            }
        }
		
        $this->_parse_modifiers($output, $modifiers);

        return $output;
    }

	/**
	 * parse arguments in function call parenthesis
	 *
	 * @param string $parenth_args
	 */
    function _parse_parenth_args($parenth_args)
    {
		preg_match_all('!' . $this->_param_regexp . '!',$parenth_args, $match);
		$match = $match[0];
		rsort($match);
		reset($match);						
		$orig_vals = $match;
		$this->_parse_vars_props($match);
		return str_replace($orig_vals, $match, $parenth_args);
	}	
		
	/**
	 * parse configuration variable expression into PHP code
	 *
	 * @param string $conf_var_expr
	 */
    function _parse_conf_var($conf_var_expr)
    {
        $parts = explode('|', $conf_var_expr, 2);
        $var_ref = $parts[0];
        $modifiers = isset($parts[1]) ? $parts[1] : '';

        $var_name = substr($var_ref, 1, -1);

        $output = "\$this->_config[0]['vars']['$var_name']";

        $this->_parse_modifiers($output, $modifiers);

        return $output;
    }


	/**
	 * parse section property expression into PHP code
	 *
	 * @param string $section_prop_expr
	 */
    function _parse_section_prop($section_prop_expr)
    {
        $parts = explode('|', $section_prop_expr, 2);
        $var_ref = $parts[0];
        $modifiers = isset($parts[1]) ? $parts[1] : '';

        preg_match('!%(\w+)\.(\w+)%!', $var_ref, $match);
        $section_name = $match[1];
        $prop_name = $match[2];

        $output = "\$this->_sections['$section_name']['$prop_name']";

        $this->_parse_modifiers($output, $modifiers);

        return $output;
    }


	/**
	 * parse modifier chain into PHP code
	 *
     * sets $output to parsed modified chain
	 * @param string $output
	 * @param string $modifier_string
	 */
    function _parse_modifiers(&$output, $modifier_string)
    {
        preg_match_all('!\|(@?\w+)((?>:(?:'. $this->_qstr_regexp . '|[^|]+))*)!', '|' . $modifier_string, $_match);
        list(, $_modifiers, $modifier_arg_strings) = $_match;

        for ($_i = 0, $_for_max = count($_modifiers); $_i < $_for_max; $_i++) {
            $_modifier_name = $_modifiers[$_i];
			
			if($_modifier_name == 'smarty') {
				// skip smarty modifier
				continue;
			}
			
            preg_match_all('!:(' . $this->_qstr_regexp . '|[^:]+)!', $modifier_arg_strings[$_i], $_match);
            $_modifier_args = $_match[1];

            if ($_modifier_name{0} == '@') {
                $_map_array = 'false';
                $_modifier_name = substr($_modifier_name, 1);
            } else {
                $_map_array = 'true';
            }
			
            $this->_add_plugin('modifier', $_modifier_name);
            $this->_parse_vars_props($_modifier_args);

			if($_modifier_name == 'default') {
				// supress notifications of default modifier vars and args
				if($output{0} == '$') {
					$output = '@' . $output;
				}
				if(isset($_modifier_args[0]) && $_modifier_args[0]{0} == '$') {
					$_modifier_args[0] = '@' . $_modifier_args[0];
				}
			}
            if (count($_modifier_args) > 0)
                $_modifier_args = ', '.implode(', ', $_modifier_args);
            else
                $_modifier_args = '';

            $output = "\$this->_run_mod_handler('$_modifier_name', $_map_array, $output$_modifier_args)";
        }
    }


	/**
	 * add plugin
	 *
	 * @param string $type
	 * @param string $name
	 * @param boolean? $delayed_loading
	 */
    function _add_plugin($type, $name, $delayed_loading = null)
    {
        if (!isset($this->_plugin_info[$type])) {
            $this->_plugin_info[$type] = array();
        }
        if (!isset($this->_plugin_info[$type][$name])) {
            $this->_plugin_info[$type][$name] = array($this->_current_file,
                                                      $this->_current_line_no,
                                                      $delayed_loading);
        }
    }
    

	/**
	 * Compiles references of type $smarty.foo
	 *
	 * @param string $indexes
	 */
    function _compile_smarty_ref(&$indexes)
    {
        /* Extract the reference name. */
        $_ref = substr($indexes[0], 1);

		foreach($indexes as $_index) {		
        	if ($_index{0} != '.') {
            	$this->_syntax_error('$smarty' . implode('', array_slice($indexes, 0, 2)) . ' is an invalid reference', E_USER_ERROR, __FILE__, __LINE__);
        	}
		}
		
        switch ($_ref) {
            case 'now':
                $compiled_ref = 'time()';
				$_max_index = 1;
                break;

            case 'foreach':
            case 'section':
                array_shift($indexes);
                $_var = $this->_parse_var_props(substr($indexes[0], 1));
                if ($_ref == 'foreach')
                    $compiled_ref = "\$this->_foreach[$_var]";
                else
                    $compiled_ref = "\$this->_sections[$_var]";
                break;

            case 'get':
                $compiled_ref = "\$GLOBALS['HTTP_GET_VARS']";
                break;

            case 'post':
                $compiled_ref = "\$GLOBALS['HTTP_POST_VARS']";
                break;

            case 'cookies':
                $compiled_ref = "\$GLOBALS['HTTP_COOKIE_VARS']";
                break;

            case 'env':
                $compiled_ref = "\$GLOBALS['HTTP_ENV_VARS']";
                break;

            case 'server':
                $compiled_ref = "\$GLOBALS['HTTP_SERVER_VARS']";
                break;

            case 'session':
                $compiled_ref = "\$GLOBALS['HTTP_SESSION_VARS']";
                break;

            /*
             * These cases are handled either at run-time or elsewhere in the
             * compiler.
             */
            case 'request':
                $this->_init_smarty_vars = true;
                return null;

            case 'capture':
                return null;

            case 'template':
                $compiled_ref = "'$this->_current_file'";
				$_max_index = 1;
                break;
				
			case 'version':
				$compiled_ref = "'$this->_version'";
				$_max_index = 1;
				break;

			case 'const':
                array_shift($indexes);
				$_val = $this->_parse_var_props(substr($indexes[0],1));
				$compiled_ref = '@constant(' . $_val . ')';
				$_max_index = 1;
                break;

            case 'config':
                $compiled_ref = "\$this->_config[0]['vars']";
				$_max_index = 2;
                break;

            default:
                $this->_syntax_error('$smarty.' . $_ref . ' is an unknown reference', E_USER_ERROR, __FILE__, __LINE__);
                break;
        }

        if (isset($_max_index) && count($indexes) > $_max_index) {
            $this->_syntax_error('$smarty' . implode('', $indexes) .' is an invalid reference', E_USER_ERROR, __FILE__, __LINE__);
        }

        array_shift($indexes);
        return $compiled_ref;
    }


	/**
	 * load pre- and post-filters
	 */
    function _load_filters()
    {
        if (count($this->_plugins['prefilter']) > 0) {
            foreach ($this->_plugins['prefilter'] as $filter_name => $prefilter) {
                if ($prefilter === false) {
                    unset($this->_plugins['prefilter'][$filter_name]);
                    $this->_load_plugins(array(array('prefilter', $filter_name, null, null, false)));
                }
            }
        }
        if (count($this->_plugins['postfilter']) > 0) {
            foreach ($this->_plugins['postfilter'] as $filter_name => $postfilter) {
                if ($postfilter === false) {
                    unset($this->_plugins['postfilter'][$filter_name]);
                    $this->_load_plugins(array(array('postfilter', $filter_name, null, null, false)));
                }
            }
        }
    }


	/**
	 * display Smarty syntax error
	 *
	 * @param string $error_msg
	 * @param integer $error_type
	 * @param string $file
	 * @param integer $line
	 */
    function _syntax_error($error_msg, $error_type = E_USER_ERROR, $file=null, $line=null)
    {
		if(isset($file) && isset($line)) {
			$info = ' ('.basename($file).", line $line)";
		} else {
			$info = null;
		}
        trigger_error('Smarty: [in ' . $this->_current_file . ' line ' .
                      $this->_current_line_no . "]: syntax error: $error_msg$info", $error_type);
    }
}

/**
 * compare to values by their string length
 *
 * @access private
 * @param string $a
 * @param string $b
 */
function _smarty_sort_length($a, $b)
{
	if($a == $b)
		return 0;

	if(strlen($a) == strlen($b))
		return ($a > $b) ? -1 : 1;

	return (strlen($a) > strlen($b)) ? -1 : 1;
}


/* vim: set et: */

?>