smarty_compiler.class.php

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                $output = call_user_func_array($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 = 'null';
            }
        }

        $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(); ";
                    $return = "\$_block_repeat=false; \$this->_reg_objects['$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)) {
            $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);

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