smarty_compiler.class.php

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<?php

/*
 * Project:     Smarty: the PHP compiling template engine
 * File:        Smarty_Compiler.class.php
 * Author:      Monte Ohrt <[e-mail]>
 *              Andrei Zmievski <[e-mail]>
 *
 * Version:     1.5.2
 * Copyright:   2001 ispi of Lincoln, Inc.
 *
 * 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:
 * [e-mail]
 * [e-mail]
 *
 * 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/
 *
 */

class Smarty_Compiler extends Smarty {

    // internal vars
    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


/*======================================================================*\
    Function:   _compile_file()
    Input:      compile a template file
\*======================================================================*/
    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;
            }
        }

        // run template source through prefilter functions
        if (is_array($this->prefilter_funcs) && count($this->prefilter_funcs) > 0) {
            foreach ($this->prefilter_funcs as $prefilter) {
                if (function_exists($prefilter)) {
                    $template_source = $prefilter($template_source, $this);
                } else {
                    $this->_trigger_error_msg("prefilter function $prefilter does not exist.");
                }
            }
        }

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

        /* 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; $curr_tb < count($text_blocks); $curr_tb++) {
            /* match anything within <? ?> */
            if (preg_match_all('!(<\?[^?]*?\?>|<script\s+language\s*=\s*[\"\']?php[\"\']?\s*>)!is', $text_blocks[$curr_tb], $sp_match)) {
                /* found at least one match, loop through each one */
                for ($curr_sp = 0; $curr_sp < count($sp_match[0]); $curr_sp++) {
                    if (preg_match('!^(<\?(php\s|\s|=\s)|<script\s*language\s*=\s*[\"\']?php[\"\']?\s*>)!is', $sp_match[0][$curr_sp])) {
                        /* php tag */
                        if ($this->php_handling == SMARTY_PHP_PASSTHRU) {
                            /* echo php contents */
                            $text_blocks[$curr_tb] = str_replace($sp_match[0][$curr_sp], '<?php echo \''.str_replace("'", "\'", $sp_match[0][$curr_sp]).'\'; ?>'."\n", $text_blocks[$curr_tb]);
                       } else if ($this->php_handling == SMARTY_PHP_QUOTE) {
                            /* quote php tags */
                            $text_blocks[$curr_tb] = str_replace($sp_match[0][$curr_sp], htmlspecialchars($sp_match[0][$curr_sp]), $text_blocks[$curr_tb]);
                        } else if ($this->php_handling == SMARTY_PHP_REMOVE) {
                            /* remove php tags */
                            if (substr($sp_match[0][$curr_sp], 0, 2) == '<?')
                                $text_blocks[$curr_tb] = str_replace($sp_match[0][$curr_sp], '', $text_blocks[$curr_tb]);
                            else
                                /* attempt to remove everything between <script ...> and </script> */
                                $text_blocks[$curr_tb] = preg_replace('!'.preg_quote($sp_match[0][$curr_sp], '!').'.*?</script\s*>!is', '', $text_blocks[$curr_tb]);
                        }
                    } else
                        /* echo the non-php tags */
                        $text_blocks[$curr_tb] = str_replace($sp_match[0][$curr_sp], '<?php echo \''.str_replace("'", "\'", $sp_match[0][$curr_sp]).'\'; ?>'."\n", $text_blocks[$curr_tb]);
                }
            }
        }

        /* Compile the template tags into PHP code. */
        $compiled_tags = array();
        for ($i = 0; $i < count($template_tags); $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; $i < count($compiled_tags); $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; $i < count($strip_tags); $i++)
                $template_compiled = preg_replace("!{$ldq}strip{$rdq}.*?{$ldq}/strip{$rdq}!s",
                                                  $this->quote_replace($strip_tags_modified[$i]),
                                                  $template_compiled, 1);
        }

        // 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";
        $template_compiled = $template_header.$template_compiled;

        // 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 (is_array($this->postfilter_funcs) && count($this->postfilter_funcs) > 0) {
            foreach ($this->postfilter_funcs as $postfilter) {
                if (function_exists($postfilter)) {
                    $template_compiled = $postfilter($template_compiled, $this);
                } else {
                    $this->_trigger_error_msg("postfilter function $postfilter does not exist.");
                }
            }
        }

        return true;
    }


/*======================================================================*\
    Function: _compile_tag
    Purpose:  Compile a template tag
\*======================================================================*/
    function _compile_tag($template_tag)
    {
        /* Matched comment. */
        if ($template_tag{0} == '*' && $template_tag{strlen($template_tag) - 1} == '*')
            return '';

        $qstr_regexp = '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"|\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\'';

        /* Split tag into two parts: command and the arguments. */
        preg_match('/^(
                       (?: ' . $qstr_regexp . ' | (?>[^"\'\s]+))+
                      )
                      (?:\s+(.*))?
                    /xs', $template_tag, $match);
        $tag_command = $match[1];
        $tag_args = isset($match[2]) ? $match[2] : '';

        /* If the tag name matches a variable or section property definition,
           we simply process it. */
        if (preg_match('!^\$\w+(?>(\[(\d+|\w+(\.\w+)?)\])|((\.|->)\w+))*(?>\|@?\w+(:(?>' . $qstr_regexp . '|[^|]+))*)*$!', $tag_command) ||   // if a variable
            preg_match('!^#(\w+)#(?>\|@?\w+(:(?>' . $qstr_regexp . '|[^|]+))*)*$!', $tag_command)     ||  // or a configuration variable
            preg_match('!^%\w+\.\w+%(?>\|@?\w+(:(?>' . $qstr_regexp . '|[^|]+))*)*$!', $tag_command)) {    // or a section property
            settype($tag_command, 'array');
            $this->_parse_vars_props($tag_command);
            return "<?php echo $tag_command[0]; ?>\n";
        }

        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']) {
                    $this->_syntax_error("(secure mode) php tags not permitted", E_USER_WARNING);
                    return;
                }
                list (,$php_block) = each($this->_php_blocks);
                $this->_current_line_no += substr_count($php_block, "\n");
                return '<?php '.$php_block.' ?>';