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
 *
 * 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://smarty.php.net/
 *
 * @link http://smarty.php.net/
 * @author Monte Ohrt <[e-mail]>
 * @author Andrei Zmievski <[e-mail]>
 * @version 2.6.0-RC2
 * @copyright 2001-2003 ispi of Lincoln, Inc.
 * @package Smarty
 */

/* $Id: Smarty_Compiler.class.php,v 1.286 2003/10/08 23:43:34 mohrt Exp $ */

/**
 * Template compiling class
 * @package Smarty
 */
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 $_output_type			=	'php';
    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;

    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 $ 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_num_var_regexp = '\-?\d+(?:\.\d+)?' . $this->_dvar_math_var_regexp;
		$this->_dvar_guts_regexp = '\w+(?:' . $this->_var_bracket_regexp
				. ')*(?:\.\$?\w+(?:' . $this->_var_bracket_regexp . ')*)*(?:' . $this->_dvar_math_regexp . '(?:\-?\d+(?:\.\d+)?|' . $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 (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 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");
                }
            }
        }
		
        /* Annihilate the comments. */
        $source_content = preg_replace("!({$ldq})\*(.*?)\*({$rdq})!se",
                                        "'\\1*'.str_repeat(\"\n\", substr_count('\\2', \"\n\")) .'*\\3'",
                                        $source_content);

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

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

        $compiled_content = '';		
	
        /* 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]);
			}
            $compiled_content .= $text_blocks[$i].$compiled_tags[$i];
        }
        $compiled_content .= $text_blocks[$i];

        /* Reformat data between 'strip' and '/strip' tags, removing spaces, tabs and newlines. */
        if (preg_match_all("!{$ldq}strip{$rdq}.*?{$ldq}/strip{$rdq}!s", $compiled_content, $_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++)
                $compiled_content = preg_replace("!{$ldq}strip{$rdq}.*?{$ldq}/strip{$rdq}!s",
                                                  $this->quote_replace($strip_tags_modified[$i]),
                                                  $compiled_content, 1);
        }

        // remove \n from the end of the file, if any