smarty_compiler.class.php

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        if (($_len=strlen($compiled_content)) && ($compiled_content{$_len - 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;
        }

        // remove unnecessary close/open tags
        $compiled_content = preg_replace('!\?>\n?<\?php!', '', $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', '$plugin_name', '$plugin_info[0]', $plugin_info[1], ";
                    $_plugins_params .= $plugin_info[2] ? 'true),' : 'false),';
                }
            }
            $_plugins_params .= '))';
			$plugins_code = "<?php require_once(SMARTY_DIR . 'core' . DIRECTORY_SEPARATOR . 'core.load_plugins.php');\nsmarty_core_load_plugins($_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_DIR . 'core' . DIRECTORY_SEPARATOR . '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)
    {
		// default to php output
		$this->_output_type = 'php';
				
        /* 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 (preg_match('!^' . $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, $this->_parse_attrs($tag_args));
			if(isset($_tag_attrs['assign'])) {
				return "<?php \$this->assign('" . $this->_dequote($_tag_attrs['assign']) . "', $_return ); ?>\n";  
			} elseif ($this->_output_type == 'php') {
            	return "<?php echo $_return; ?>" . $this->_additional_newline;
			} else {
				// static
				return $_return;
			}
		}
		
	    /* 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; unset(\$_from); else: ?>";

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

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

            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))."'; ?>" . $this->_additional_newline;

            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 $output
     * @return boolean
	 */
    function _compile_compiler_tag($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 ($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 (!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) {
            $output = '<?php ' . $this->_push_cacheable_state('block', $tag_command);
            $attrs = $this->_parse_attrs($tag_args);
            $arg_list = $this->_compile_arg_list('block', $tag_command, $attrs, $_cache_attrs='');
            $output .= "$_cache_attrs\$_params = \$this->_tag_stack[] = array('$tag_command', array(".implode(',', $arg_list).')); ';
            $output .= $this->_compile_plugin_call('block', $tag_command).'($_params[1], null, $this, $_block_repeat=true); unset($_params);';