/lib/smarty/Smarty_Compiler.class.php

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<?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
 *
 * @link http://smarty.php.net/
 * @author Monte Ohrt <monte at ohrt dot com>
 * @author Andrei Zmievski <andrei@php.net>
 * @version 2.6.26
 * @copyright 2001-2005 New Digital Group, Inc.
 * @package Smarty
 */

/* $Id$ */

/**
 * Template compiling class
 * @package Smarty
 */
class Smarty_Compiler extends Smarty {

    // internal vars
    /**#@+
     * @access private
     */
    var $_folded_blocks         =   array();    // keeps folded template 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 $_reg_obj_regexp        =   null;
    var $_var_bracket_regexp    =   null;
    var $_num_const_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;
    var $_cacheable_state       =   0;
    var $_cache_attrs_count     =   0;
    var $_nocache_count         =   0;
    var $_cache_serial          =   null;
    var $_cache_include         =   null;

    var $_strip_depth           =   0;
    var $_additional_newline    =   "\n";

    /**#@-*/
    /**
     * 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 numerical constants
        // 30
        // -12
        // 13.22
        $this->_num_const_regexp = '(?:\-?\d+(?:\.\d+)?)';

        // matches $ vars (not objects):
        // $foo
        // $foo.bar
        // $foo.bar.foobar
        // $foo[0]
        // $foo[$bar]
        // $foo[5][blah]
        // $foo[5].bar[$foobar][4]
        $this->_dvar_math_regexp = '(?:[\+\*\/\%]|(?:-(?!>)))';
        $this->_dvar_math_var_regexp = '[\$\w\.\+\-\*\/\%\d\>\[\]]';
        $this->_dvar_guts_regexp = '\w+(?:' . $this->_var_bracket_regexp
                . ')*(?:\.\$?\w+(?:' . $this->_var_bracket_regexp . ')*)*(?:' . $this->_dvar_math_regexp . '(?:' . $this->_num_const_regexp . '|' . $this->_dvar_math_var_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 (one level of object nesting 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()
        // $foo->bar($foo->bar)
        // $foo->bar($foo->bar())
        // $foo->bar($foo->bar($blah,$foo,44,"foo",$foo[0].bar))
        $this->_obj_ext_regexp = '\->(?:\$?' . $this->_dvar_guts_regexp . ')';
        $this->_obj_restricted_param_regexp = '(?:'
                . '(?:' . $this->_var_regexp . '|' . $this->_num_const_regexp . ')(?:' . $this->_obj_ext_regexp . '(?:\((?:(?:' . $this->_var_regexp . '|' . $this->_num_const_regexp . ')'
                . '(?:\s*,\s*(?:' . $this->_var_regexp . '|' . $this->_num_const_regexp . '))*)?\))?)*)';
        $this->_obj_single_param_regexp = '(?:\w+|' . $this->_obj_restricted_param_regexp . '(?:\s*,\s*(?:(?:\w+|'
                . $this->_var_regexp . $this->_obj_restricted_param_regexp . ')))*)';
        $this->_obj_params_regexp = '\((?:' . $this->_obj_single_param_regexp
                . '(?:\s*,\s*' . $this->_obj_single_param_regexp . ')*)?\)';
        $this->_obj_start_regexp = '(?:' . $this->_dvar_regexp . '(?:' . $this->_obj_ext_regexp . ')+)';
        $this->_obj_call_regexp = '(?:' . $this->_obj_start_regexp . '(?:' . $this->_obj_params_regexp . ')?(?:' . $this->_dvar_math_regexp . '(?:' . $this->_num_const_regexp . '|' . $this->_dvar_math_var_regexp . ')*)?)';
        // Added 2004-01-07 Used for expanding object calls in backticks
        $this->_obj_callext_regexp = '(?:' . $this->_obj_ext_regexp . ')' . '(?:' . $this->_obj_params_regexp . ')?(?:' . $this->_dvar_math_regexp . '(?:' . $this->_num_const_regexp . '|' . $this->_dvar_math_var_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->_num_const_regexp . '|'
           . $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 . '|' . $this->_num_const_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 resource
     *
     * sets $compiled_content to the compiled source
     * @param string $resource_name
     * @param string $source_content
     * @param string $compiled_content
     * @return true
     */
    function _compile_file($resource_name, $source_content, &$compiled_content)
    {

        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 = $resource_name;
        $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 ($prefilter[3] || is_callable($prefilter[0])) {
                    $source_content = call_user_func_array($prefilter[0],
                                                            array($source_content, &$this));
                    $this->_plugins['prefilter'][$filter_name][3] = true;
                } else {
                    $this->_trigger_fatal_error("[plugin] prefilter '$filter_name' is not implemented");
                }
            }
        }

        /* fetch all special blocks */
        $search = "~{$ldq}\*(.*?)\*{$rdq}|{$ldq}\s*literal\s*{$rdq}(.*?){$ldq}\s*/literal\s*{$rdq}|{$ldq}\s*php\s*{$rdq}(.*?){$ldq}\s*/php\s*{$rdq}~s";

        preg_match_all($search, $source_content, $match,  PREG_SET_ORDER);
        $this->_folded_blocks = $match;
        reset($this->_folded_blocks);

        /* replace special blocks by "{php}" */
        $source_content = preg_replace($search.'e', "'"
                                       . $this->_quote_replace($this->left_delimiter) . 'php'
                                       . "' . str_repeat(\"\n\", substr_count('\\0', \"\n\")) .'"
                                       . $this->_quote_replace($this->right_delimiter)
                                       . "'"
                                       , $source_content);

        /* Gather all template tags. */
        preg_match_all("~{$ldq}\s*(.*?)\s*{$rdq}~s", $source_content, $_match);
        $template_tags = $_match[1];
        /* Split content by template tags to obtain non-template content. */
        $text_blocks = preg_split("~{$ldq}.*?{$rdq}~s", $source_content);

        /* 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*[\"\']?\s*php\s*[\"\']?)~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[1]); $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[$i], "\n");
        }
        if (count($this->_tag_stack)>0) {
            list($_open_tag, $_line_no) = end($this->_tag_stack);
            $this->_syntax_error("unclosed tag \{$_open_tag} (opened line $_line_no).", E_USER_ERROR, __FILE__, __LINE__);
            return;
        }

        /* Reformat $text_blocks between 'strip' and '/strip' tags,
           removing spaces, tabs and newlines. */
        $strip = false;
        for ($i = 0, $for_max = count($compiled_tags); $i < $for_max; $i++) {
            if ($compiled_tags[$i] == '{strip}') {
                $compiled_tags[$i] = '';
                $strip = true;
                /* remove leading whitespaces */
                $text_blocks[$i + 1] = ltrim($text_blocks[$i + 1]);
            }
            if ($strip) {
                /* strip all $text_blocks before the next '/strip' */
                for ($j = $i + 1; $j < $for_max; $j++) {
                    /* remove leading and trailing whitespaces of each line */
                    $text_blocks[$j] = preg_replace('![\t ]*[\r\n]+[\t ]*!', '', $text_blocks[$j]);
                    if ($compiled_tags[$j] == '{/strip}') {                       
                        /* remove trailing whitespaces from the last text_block */
                        $text_blocks[$j] = rtrim($text_blocks[$j]);
                    }
                    $text_blocks[$j] = "<?php echo '" . strtr($text_blocks[$j], array("'"=>"\'", "\\"=>"\\\\")) . "'; ?>";
                    if ($compiled_tags[$j] == '{/strip}') {
                        $compiled_tags[$j] = "\n"; /* slurped by php, but necessary
                                    if a newline is following the closing strip-tag */
                        $strip = false;
                        $i = $j;
                        break;
                    }
                }
            }
        }
        $compiled_content = '';
        
        $tag_guard = '%%%SMARTYOTG' . md5(uniqid(rand(), true)) . '%%%';
        
        /* Interleave the compiled contents and text blocks to get the final result. */
        for ($i = 0, $for_max = count($compiled_tags); $i < $for_max; $i++) {
            if ($compiled_tags[$i] == '') {
                // tag result empty, remove first newline from following text block
                $text_blocks[$i+1] = preg_replace('~^(\r\n|\r|\n)~', '', $text_blocks[$i+1]);
            }
            // replace legit PHP tags with placeholder
            $text_blocks[$i] = str_replace('<?', $tag_guard, $text_blocks[$i]);
            $compiled_tags[$i] = str_replace('<?', $tag_guard, $compiled_tags[$i]);
            
            $compiled_content .= $text_blocks[$i] . $compiled_tags[$i];
        }
        $compiled_content .= str_replace('<?', $tag_guard, $text_blocks[$i]);

        // escape php tags created by interleaving
        $compiled_content = str_replace('<?', "<?php echo '<?' ?>\n", $compiled_content);
        $compiled_content = preg_replace("~(?<!')language\s*=\s*[\"\']?\s*php\s*[\"\']?~", "<?php echo 'language=php' ?>\n", $compiled_content);

        // recover legit tags
        $compiled_content = str_replace($tag_guard, '<?', $compiled_content); 
        
        // remove \n from the end of the file, if any
        if (strlen($compiled_content) && (substr($compiled_content, -1) == "\n") ) {
            $compiled_content = substr($compiled_content, 0, -1);
        }

        if (!empty($this->_cache_serial)) {
            $compiled_content = "<?php \$this->_cache_serials['".$this->_cache_include."'] = '".$this->_cache_serial."'; ?>" . $compiled_content;
        }

        // 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 ($postfilter[3] || is_callable($postfilter[0])) {
                    $compiled_content = call_user_func_array($postfilter[0],
                                                              array($compiled_content, &$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";
        $template_header .= "         compiled from ".strtr(urlencode($resource_name), array('%2F'=>'/', '%3A'=>':'))." */ ?>\n";

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

        if ($this->_init_smarty_vars) {
            $template_header .= "<?php require_once(SMARTY_CORE_DIR . 'core.assign_smarty_interface.php');\nsmarty_core_assign_smarty_interface(null, \$this); ?>\n";
            $this->_init_smarty_vars = false;
        }

        $compiled_content = $template_header . $compiled_content;
        return true;
    }

    /**
     * Compile a template tag
     *
     * @param string $template_tag
     * @return string
     */
    function _compile_tag($template_tag)
    {
        /* Matched comment. */
        if (substr($template_tag, 0, 1) == '*' && substr($template_tag, -1) == '*')
            return '';
        
        /* Split tag into two three parts: command, command modifiers and the arguments. */
        if(! preg_match('~^(?:(' . $this->_num_const_regexp . '|' . $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 (preg_match('~^' . $this->_num_const_regexp . '|' . $this->_obj_call_regexp . '|' . $this->_var_regexp . '$~', $tag_command)) {
            /* tag name is a variable or object */
            $_return = $this->_parse_var_props($tag_command . $tag_modifier);
            return "<?php echo $_return; ?>" . $this->_additional_newline;
        }

        /* 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':
                $this->_push_tag('if');
                return $this->_compile_if_tag($tag_args);

            case 'else':
                list($_open_tag) = end($this->_tag_stack);
                if ($_open_tag != 'if' && $_open_tag != 'elseif')
                    $this->_syntax_error('unexpected {else}', E_USER_ERROR, __FILE__, __LINE__);
                else
                    $this->_push_tag('else');
                return '<?php else: ?>';

            case 'elseif':
                list($_open_tag) = end($this->_tag_stack);
                if ($_open_tag != 'if' && $_open_tag != 'elseif')
                    $this->_syntax_error('unexpected {elseif}', E_USER_ERROR, __FILE__, __LINE__);
                if ($_open_tag == 'if')
                    $this->_push_tag('elseif');
                return $this->_compile_if_tag($tag_args, true);

            case '/if':
                $this->_pop_tag('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':
                $this->_push_tag('section');
                return $this->_compile_section_start($tag_args);

            case 'sectionelse':
                $this->_push_tag('sectionelse');
                return "<?php endfor; else: ?>";
                break;

            case '/section':
                $_open_tag = $this->_pop_tag('section');
                if ($_open_tag == 'sectionelse')
                    return "<?php endif; ?>";
                else
                    return "<?php endfor; endif; ?>";

            case 'foreach':
                $this->_push_tag('foreach');
                return $this->_compile_foreach_start($tag_args);
                break;

            case 'foreachelse':
                $this->_push_tag('foreachelse');
                return "<?php endforeach; else: ?>";

            case '/foreach':
                $_open_tag = $this->_pop_tag('foreach');
                if ($_open_tag == 'foreachelse')
                    return "<?php endif; unset(\$_from); ?>";
                else
                    return "<?php endforeach; endif; unset(\$_from); ?>";
                break;

            case 'strip':
            case '/strip':
                if (substr($tag_command, 0, 1)=='/') {
                    $this->_pop_tag('strip');
                    if (--$this->_strip_depth==0) { /* outermost closing {/strip} */
                        $this->_additional_newline = "\n";
                        return '{' . $tag_command . '}';
                    }
                } else {
                    $this->_push_tag('strip');
                    if ($this->_strip_depth++==0) { /* outermost opening {strip} */
                        $this->_additional_newline = "";
                        return '{' . $tag_command . '}';
                    }
                }
                return '';

            case 'php':
                /* handle folded tags replaced by {php} */
                list(, $block) = each($this->_folded_blocks);
                $this->_current_line_no += substr_count($block[0], "\n");
                /* the number of matched elements in the regexp in _compile_file()
                   determins the type of folded tag that was found */
                switch (count($block)) {
                    case 2: /* comment */
                        return '';

                    case 3: /* literal */
                        return "<?php echo '" . strtr($block[2], array("'"=>"\'", "\\"=>"\\\\")) . "'; ?>" . $this->_additional_newline;

                    case 4: /* php */
                        if ($this->security && !$this->security_settings['PHP_TAGS']) {
                            $this->_syntax_error("(secure mode) php tags not permitted", E_USER_WARNING, __FILE__, __LINE__);
                            return;
                        }
                        return '<?php ' . $block[3] .' ?>';
                }
                break;

            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 $output;
                } else if ($this->_compile_custom_tag($tag_command, $tag_args, $tag_modifier, $output)) {
                    return $output;                    
                } else {
                    $this->_syntax_error("unrecognized tag '$tag_command'", E_USER_ERROR, __FILE__, __LINE__);
                }

        }
    }


    /**
     * compile the custom compiler tag
     *
     * sets $output to the compiled custom compiler tag
     * @param string $tag_command
     * @param string $tag_args
     * @param string $output
     * @return boolean
     */
    function _compile_compiler_tag($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 (!is_callable($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_' . $tag_command;
            if (!is_callable($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, null, true);
            }
        }

        /*
         * 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) {
                $output = call_user_func_array($plugin_func, array($tag_args, &$this));
                if($output != '') {
                $output = '<?php ' . $this->_push_cacheable_state('compiler', $tag_command)
                                   . $output
                                   . $this->_pop_cacheable_state('compiler', $tag_command) . ' ?>';
                }
            } 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 $output
     * @return boolean
     */
    function _compile_block_tag($tag_command, $tag_args, $tag_modifier, &$output)
    {
        if (substr($tag_command, 0, 1) == '/') {
            $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 (!is_callable($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, null, true);

            }
        }

        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)
            $this->_push_tag($tag_command);
        else
            $this->_pop_tag($tag_command);

        if ($start_tag) {
            $output = '<?php ' . $this->_push_cacheable_state('block', $tag_command);
            $attrs = $this->_parse_attrs($tag_args);
            $_cache_attrs='';
            $arg_list = $this->_compile_arg_list('block', $tag_command, $attrs, $_cache_attrs);
            $output .= "$_cache_attrs\$this->_tag_stack[] = array('$tag_command', array(".implode(',', $arg_list).')); ';
            $output .= '$_block_repeat=true;' . $this->_compile_plugin_call('block', $tag_command).'($this->_tag_stack[count($this->_tag_stack)-1][1], null, $this, $_block_repeat);';
            $output .= 'while ($_block_repeat) { ob_start(); ?>';
        } else {
            $output = '<?php $_block_content = ob_get_contents(); ob_end_clean(); ';
            $_out_tag_text = $this->_compile_plugin_call('block', $tag_command).'($this->_tag_stack[count($this->_tag_stack)-1][1], $_block_content, $this, $_block_repeat)';
            if ($tag_modifier != '') {
                $this->_parse_modifiers($_out_tag_text, $tag_modifier);
            }
            $output .= '$_block_repeat=false;echo ' . $_out_tag_text . '; } ';
            $output .= " array_pop(\$this->_tag_stack); " . $this->_pop_cacheable_state('block', $tag_command) . '?>';
        }

        return true;
    }


    /**
     * compile custom function tag
     *
     * @param string $tag_command
     * @param string $tag_args
     * @param string $tag_modifier
     * @return string
     */
    function _compile_custom_tag($tag_command, $tag_args, $tag_modifier, &$output)
    {
        $found = false;
        $have_function = true;

        /*
         * First we check if the custom function has already been registered
         * or loaded from a plugin file.
         */
        if (isset($this->_plugins['function'][$tag_command])) {
            $found = true;
            $plugin_func = $this->_plugins['function'][$tag_command][0];
            if (!is_callable($plugin_func)) {
                $message = "custom function '$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('function', $tag_command)) {
            $found = true;

            include_once $plugin_file;

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

            }
        }

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

        /* declare plugin to be loaded on display of the template that
           we compile right now */
        $this->_add_plugin('function', $tag_command);

        $_cacheable_state = $this->_push_cacheable_state('function', $tag_command);
        $attrs = $this->_parse_attrs($tag_args);
        $_cache_attrs = '';
        $arg_list = $this->_compile_arg_list('function', $tag_command, $attrs, $_cache_attrs);

        $output = $this->_compile_plugin_call('function', $tag_command).'(array('.implode(',', $arg_list)."), \$this)";
        if($tag_modifier != '') {
            $this->_parse_modifiers($output, $tag_modifier);
        }

        if($output != '') {
            $output =  '<?php ' . $_cacheable_state . $_cache_attrs . 'echo ' . $output . ';'
                . $this->_pop_cacheable_state('function', $tag_command) . "?>" . $this->_additional_newline;
        }

        return true;
    }

    /**
     * compile a registered object tag
     *
     * @param string $tag_command
     * @param array $attrs
     * @param string $tag_modifier
     * @return string
     */
    function _compile_registered_object_tag($tag_command, $attrs, $tag_modifier)
    {
        if (substr($tag_command, 0, 1) == '/') {
            $start_tag = false;
            $tag_command = substr($tag_command, 1);
        } else {
            $start_tag = true;
        }

        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($this->_reg_objects[$object][2]) {
            // smarty object argument format
            $args = "array(".implode(',', (array)$arg_list)."), \$this";
        } else {
            // traditional argument format
            $args = implode(',', array_values($attrs));
            if (empty($args)) {
                $args = '';
            }
        }

        $prefix = '';
        $postfix = '';
        $newline = '';
        if(!is_object($this->_reg_objects[$object][0])) {
            $this->_trigger_fatal_error("registered '$object' is not an object" , $this->_current_file, $this->_current_line_no, __FILE__, __LINE__);
        } elseif(!empty($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'", $this->_current_file, $this->_current_line_no, __FILE__, __LINE__);
        } elseif(method_exists($this->_reg_objects[$object][0], $obj_comp)) {
            // method
            if(in_array($obj_comp, $this->_reg_objects[$object][3])) {
                // block method
                if ($start_tag) {
                    $prefix = "\$this->_tag_stack[] = array('$obj_comp', $args); ";
                    $prefix .= "\$_block_repeat=true; \$this->_reg_objects['$object'][0]->$obj_comp(\$this->_tag_stack[count(\$this->_tag_stack)-1][1], null, \$this, \$_block_repeat); ";
                    $prefix .= "while (\$_block_repeat) { ob_start();";
                    $return = null;
                    $postfix = '';
                } else {
                    $prefix = "\$_obj_block_content = ob_get_contents(); ob_end_clean(); \$_block_repeat=false;";
                    $return = "\$this->_reg_objects['$object'][0]->$obj_comp(\$this->_tag_stack[count(\$this->_tag_stack)-1][1], \$_obj_block_content, \$this, \$_block_repeat)";
                    $postfix = "} array_pop(\$this->_tag_stack);";
                }
            } else {
                // non-block method
                $return = "\$this->_reg_objects['$object'][0]->$obj_comp($args)";
            }
        } else {
            // property
            $return = "\$this->_reg_objects['$object'][0]->$obj_comp";
        }

        if($return != null) {
            if($tag_modifier != '') {
                $this->_parse_modifiers($return, $tag_modifier);
            }

            if(!empty($_assign_var)) {
                $output = "\$this->assign('" . $this->_dequote($_assign_var) ."',  $return);";
            } else {
                $output = 'echo ' . $return . ';';
                $newline = $this->_additional_newline;
            }
        } else {
            $output = '';
        }

        return '<?php ' . $prefix . $output . $postfix . "?>" . $newline;
    }

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

        if (empty($name)) {
            return $this->_syntax_error("missing insert name", E_USER_ERROR, __FILE__, __LINE__);
        }
        
        if (!preg_match('~^\w+$~', $name)) {
            return $this->_syntax_error("'insert: 'name' must be an insert function 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);

        $_params = "array('args' => array(".implode(', ', (array)$arg_list)."))";

        return "<?php require_once(SMARTY_CORE_DIR . 'core.run_insert_handler.php');\necho smarty_core_run_insert_handler($_params, \$this); ?>" . $this->_additional_newline;
    }

    /**
     * Compile {include ...} tag
     *
     * @param string $tag_args
     * @return string
     */
    function _compile_include_tag($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";


        $_params = "array('smarty_include_tpl_file' => " . $include_file . ", 'smarty_include_vars' => array(".implode(',', (array)$arg_list)."))";
        $output .= "\$this->_smarty_include($_params);\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 $tag_args
     * @return string
     */
    function _compile_include_php_tag($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__);
        }

        $assign_var = (empty($attrs['assign'])) ? '' : $this->_dequote($attrs['assign']);
        $once_var = (empty($attrs['once']) || $attrs['once']=='false') ? 'false' : 'true';

        $arg_list = array();
        foreach($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";
            }
        }

        $_params = "array('smarty_file' => " . $attrs['file'] . ", 'smarty_assign' => '$assign_var', 'smarty_once' => $once_var, 'smarty_include_vars' => array(".implode(',', $arg_list)."))";

        return "<?php require_once(SMARTY_CORE_DIR . 'core.smarty_include_php.php');\nsmarty_core_smarty_include_php($_params, \$this); ?>" . $this->_additional_newline;
    }


    /**
     * Compile {section ...} tag
     *
     * @param string $tag_args
     * @return string
     */
    function _compile_section_start($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__);
        }

        $output .= "unset(\$this->_sections[$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(\$_loop=$attr_value) ? count(\$_loop) : max(0, (int)\$_loop); unset(\$_loop);\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 $tag_args
     * @return string
     */
    function _compile_foreach_start($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $arg_list = array();

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

        if (empty($attrs['item'])) {
            return $this->_syntax_error("foreach: missing 'item' attribute", E_USER_ERROR, __FILE__, __LINE__);
        }
        $item = $this->_dequote($attrs['item']);
        if (!preg_match('~^\w+$~', $item)) {
            return $this->_syntax_error("foreach: 'item' must be a variable name (literal string)", E_USER_ERROR, __FILE__, __LINE__);
        }

        if (isset($attrs['key'])) {
            $key  = $this->_dequote($attrs['key']);
            if (!preg_match('~^\w+$~', $key)) {
                return $this->_syntax_error("foreach: 'key' must to be a variable name (literal string)", E_USER_ERROR, __FILE__, __LINE__);
            }
            $key_part = "\$this->_tpl_vars['$key'] => ";
        } else {
            $key = null;
            $key_part = '';
        }

        if (isset($attrs['name'])) {
            $name = $attrs['name'];
        } else {
            $name = null;
        }

        $output = '<?php ';
        $output .= "\$_from = $from; if (!is_array(\$_from) && !is_object(\$_from)) { settype(\$_from, 'array'); }";
        if (isset($name)) {
            $foreach_props = "\$this->_foreach[$name]";
            $output .= "{$foreach_props} = array('total' => count(\$_from), 'iteration' => 0);\n";
            $output .= "if ({$foreach_props}['total'] > 0):\n";
            $output .= "  …