模板类为系统核心类库，为能更好的组织主题，使模板更加高效。
/** */ class Template { private $_module = ''; private $_controller = ''; private $_method = ''; private $_theme = NULL; private $_theme_path = NULL; //主题的路径可以在配置文件中设置 private $_layout = FALSE; // By default, dont wrap the view with anything private $_layout_subdir = ''; // Layouts and partials will exist in views/layouts // but can be set to views/foo/layouts with a subdirectory private $_title = ''; private $_metadata = array(); private $_partials = array(); private $_breadcrumbs = array(); private $_title_separator = ' | '; private $_parser_enabled = TRUE; private $_parser_body_enabled = TRUE; private $_theme_locations = array(); private $_is_mobile = FALSE; // 缓存保存的时间：分钟 private $cache_lifetime = 0; private $_ci; private $_data = array(); /** * Constructor - Sets Preferences * * The constructor can be passed an array of config values */ function __construct($config = array()) { $this->_ci =& get_instance(); if ( ! empty($config)) { $this->initialize($config); } log_message('debug', 'Template Class Initialized'); } // -------------------------------------------------------------------- /** * Initialize preferences * * @access public * @param array * @return void */ function initialize($config = array()) { foreach ($config as $key => $val) { if ($key == 'theme' AND $val != '') { $this->set_theme($val); continue; } $this->{'_'.$key} = $val; } // No locations set in config? if ($this->_theme_locations === array()) { // Let's use this obvious default $this->_theme_locations = array(APPPATH . 'themes/'); } // Theme was set if ($this->_theme) { $this->set_theme($this->_theme); } // If the parse is going to be used, best make sure it's loaded if ($this->_parser_enabled === TRUE) { $this->_ci->load->library('parser'); } // Modular Separation / Modular Extensions has been detected if (method_exists( $this->_ci->router, 'fetch_module' )) { $this->_module = $this->_ci->router->fetch_module(); } // What controllers or methods are in use $this->_controller = $this->_ci->router->fetch_class(); $this->_method = $this->_ci->router->fetch_method(); // Load user agent library if not loaded $this->_ci->load->library('user_agent'); // We'll want to know this later $this->_is_mobile = $this->_ci->agent->is_mobile(); } // -------------------------------------------------------------------- /** * Magic Get function to get data * * @access public * @param string * @return mixed */ public function __get($name) { return isset($this->_data[$name]) ? $this->_data[$name] : NULL; } // -------------------------------------------------------------------- /** * Magic Set function to set data * * @access public * @param string * @return mixed */ public function __set($name, $value) { $this->_data[$name] = $value; } // -------------------------------------------------------------------- /** * Set data using a chainable metod. Provide two strings or an array of data. * * @access public * @param string * @return mixed */ public function set($name, $value = NULL) { // Lots of things! Set them all if (is_array($name) OR is_object($name)) { foreach ($name as $item => $value) { $this->_data[$item] = $value; } } // Just one thing, set that else { $this->_data[$name] = $value; } return $this; } // -------------------------------------------------------------------- /** * Build the entire HTML output combining partials, layouts and views. * * @access public * @param string * @return void */ public function build($view, $data = array(), $return = FALSE) { // Set whatever values are given. These will be available to all view files is_array($data) OR $data = (array) $data; // Merge in what we already have with the specific data $this->_data = array_merge($this->_data, $data); // We don't need you any more buddy unset($data); if (empty($this->_title)) { $this->_title = $this->_guess_title(); } // Output template variables to the template $template['title'] = $this->_title; $template['breadcrumbs'] = $this->_breadcrumbs; $template['metadata'] = implode("\n\t\t", $this->_metadata); $template['partials'] = array(); // Assign by reference, as all loaded views will need access to partials $this->_data['template'] =& $template; foreach ($this->_partials as $name => $partial) { // We can only work with data arrays is_array($partial['data']) OR $partial['data'] = (array) $partial['data']; // If it uses a view, load it if (isset($partial['view'])) { $template['partials'][$name] = $this->_find_view($partial['view'], $partial['data']); } // Otherwise the partial must be a string else { if ($this->_parser_enabled === TRUE) { $partial['string'] = $this->_ci->parser->parse_string($partial['string'], $this->_data + $partial['data'], TRUE, TRUE); } $template['partials'][$name] = $partial['string']; } } // Disable sodding IE7's constant cacheing!! $this->_ci->output->set_header('Expires: Sat, 01 Jan 2000 00:00:01 GMT'); $this->_ci->output->set_header('Cache-Control: no-store, no-cache, must-revalidate'); $this->_ci->output->set_header('Cache-Control: post-check=0, pre-check=0, max-age=0'); $this->_ci->output->set_header('Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' ); $this->_ci->output->set_header('Pragma: no-cache'); // Let CI do the caching instead of the browser $this->_ci->output->cache($this->cache_lifetime); // Test to see if this file $this->_body = $this->_find_view($view, array(), $this->_parser_body_enabled); // Want this file wrapped with a layout file? if ($this->_layout) { // Added to $this->_data['template'] by refference $template['body'] = $this->_body; // Find the main body and 3rd param means parse if its a theme view (only if parser is enabled) $this->_body = self::_load_view('layouts/'.$this->_layout, $this->_data, TRUE, self::_find_view_folder()); } // Want it returned or output to browser? if ( ! $return) { $this->_ci->output->set_output($this->_body); } return $this->_body; } /** * Set the title of the page * * @access public * @param string * @return void */ public function title() { // If we have some segments passed if (func_num_args() >= 1) { $title_segments = func_get_args(); $this->_title = implode($this->_title_separator, $title_segments); } return $this; } /** * Put extra javascipt, css, meta tags, etc before all other head data * * @access public * @param string $line The line being added to head * @return void */ public function prepend_metadata($line) { array_unshift($this->_metadata, $line); return $this; } /** * Put extra javascipt, css, meta tags, etc after other head data * * @access public * @param string $line The line being added to head * @return void */ public function append_metadata($line) { $this->_metadata[] = $line; return $this; } /** * Set metadata for output later * * @access public * @param string $name keywords, description, etc * @param string $content The content of meta data * @param string $type Meta-data comes in a few types, links for example * @return void */ public function set_metadata($name, $content, $type = 'meta') { $name = htmlspecialchars(strip_tags($name)); $content = htmlspecialchars(strip_tags($content)); // Keywords with no comments? ARG! comment them if ($name == 'keywords' AND ! strpos($content, ',')) { $content = preg_replace('/[\s]+/', ', ', trim($content)); } switch($type) { case 'meta': $this->_metadata[$name] = '<meta name="'.$name.'" content="'.$content.'" />'; break; case 'link': $this->_metadata[$content] = '<link rel="'.$name.'" href="'.$content.'" />'; break; } return $this; } /** * Which theme are we using here? * * @access public * @param string $theme Set a theme for the template library to use * @return void */ public function set_theme($theme = NULL) { $this->_theme = $theme; foreach ($this->_theme_locations as $location) { if ($this->_theme AND file_exists($location.$this->_theme)) { $this->_theme_path = rtrim($location.$this->_theme.'/'); break; } } return $this; } /** * Get the current theme * * @access public * @return string The current theme */ public function get_theme() { return $this->_theme; } /** * Get the current theme path * * @access public * @return string The current theme path */ public function get_theme_path() { return $this->_theme_path; } /** * Which theme layout should we using here? * * @access public * @param string $view * @return void */ public function set_layout($view, $_layout_subdir = '') { $this->_layout = $view; $_layout_subdir AND $this->_layout_subdir = $_layout_subdir; return $this; } /** * Set a view partial * * @access public * @param string * @param string * @param boolean * @return void */ public function set_partial($name, $view, $data = array()) { $this->_partials[$name] = array('view' => $view, 'data' => $data); return $this; } /** * Set a view partial * * @access public * @param string * @param string * @param boolean * @return void */ public function inject_partial($name, $string, $data = array()) { $this->_partials[$name] = array('string' => $string, 'data' => $data); return $this; } /** * Helps build custom breadcrumb trails * * @access public * @param string $name What will appear as the link text * @param string $url_ref The URL segment * @return void */ public function set_breadcrumb($name, $uri = '') { $this->_breadcrumbs[] = array('name' => $name, 'uri' => $uri ); return $this; } /** * Set a the cache lifetime * * @access public * @param string * @param string * @param boolean * @return void */ public function set_cache($minutes = 0) { $this->cache_lifetime = $minutes; return $this; } /** * enable_parser * Should be parser be used or the view files just loaded normally? * * @access public * @param string $view * @return void */ public function enable_parser($bool) { $this->_parser_enabled = $bool; return $this; } /** * enable_parser_body * Should be parser be used or the body view files just loaded normally? * * @access public * @param string $view * @return void */ public function enable_parser_body($bool) { $this->_parser_body_enabled = $bool; return $this; } /** * theme_locations * List the locations where themes may be stored * * @access public * @param string $view * @return array */ public function theme_locations() { return $this->_theme_locations; } /** * add_theme_location * Set another location for themes to be looked in * * @access public * @param string $view * @return array */ public function add_theme_location($location) { $this->_theme_locations[] = $location; } /** * theme_exists * Check if a theme exists * * @access public * @param string $view * @return array */ public function theme_exists($theme = NULL) { $theme OR $theme = $this->_theme; foreach ($this->_theme_locations as $location) { if (is_dir($location.$theme)) { return TRUE; } } return FALSE; } /** * get_layouts * Get all current layouts (if using a theme you'll get a list of theme layouts) * * @access public * @param string $view * @return array */ public function get_layouts() { $layouts = array(); foreach(glob(self::_find_view_folder().'layouts/*.*') as $layout) { $layouts[] = pathinfo($layout, PATHINFO_BASENAME); } return $layouts; } /** * get_layouts * Get all current layouts (if using a theme you'll get a list of theme layouts) * * @access public * @param string $view * @return array */ public function get_theme_layouts($theme = NULL) { $theme OR $theme = $this->_theme; $layouts = array(); foreach ($this->_theme_locations as $location) { // Get special web layouts if( is_dir($location.$theme.'/views/web/layouts/') ) { foreach(glob($location.$theme . '/views/web/layouts/*.*') as $layout) { $layouts[] = pathinfo($layout, PATHINFO_BASENAME); } break; } // So there are no web layouts, assume all layouts are web layouts if(is_dir($location.$theme.'/views/layouts/')) { foreach(glob($location.$theme . '/views/layouts/*.*') as $layout) { $layouts[] = pathinfo($layout, PATHINFO_BASENAME); } break; } } return $layouts; } /** * layout_exists * Check if a theme layout exists * * @access public * @param string $view * @return array */ public function layout_exists($layout) { // If there is a theme, check it exists in there if ( ! empty($this->_theme) AND in_array($layout, self::get_theme_layouts())) { return TRUE; } // Otherwise look in the normal places return file_exists(self::_find_view_folder().'layouts/' . $layout . self::_ext($layout)); } /** * load_view * Load views from theme paths if they exist. * * @access public * @param string $view * @param mixed $data * @return array */ public function load_view($view, $data = array()) { return $this->_find_view($view, (array)$data); } // find layout files, they could be mobile or web private function _find_view_folder() { if ($this->_ci->load->get_var('template_views')) { return $this->_ci->load->get_var('template_views'); } // Base view folder $view_folder = APPPATH.'views/'; // Using a theme? Put the theme path in before the view folder if ( ! empty($this->_theme)) { $view_folder = $this->_theme_path.'views/'; } // Would they like the mobile version? if ($this->_is_mobile === TRUE AND is_dir($view_folder.'mobile/')) { // Use mobile as the base location for views $view_folder .= 'mobile/'; } // Use the web version else if (is_dir($view_folder.'web/')) { $view_folder .= 'web/'; } // Things like views/admin/web/view admin = subdir if ($this->_layout_subdir) { $view_folder .= $this->_layout_subdir.'/'; } // If using themes store this for later, available to all views $this->_ci->load->vars('template_views', $view_folder); return $view_folder; } // A module view file can be overriden in a theme private function _find_view($view, array $data, $parse_view = TRUE) { // Only bother looking in themes if there is a theme if ( ! empty($this->_theme)) { foreach ($this->_theme_locations as $location) { $theme_views = array( $this->_theme . '/views/modules/' . $this->_module . '/' . $view, $this->_theme . '/views/' . $view ); foreach ($theme_views as $theme_view) { if (file_exists($location . $theme_view . self::_ext($theme_view))) { return self::_load_view($theme_view, $this->_data + $data, $parse_view, $location); } } } } // Not found it yet? Just load, its either in the module or root view return self::_load_view($view, $this->_data + $data, $parse_view); } private function _load_view($view, array $data, $parse_view = TRUE, $override_view_path = NULL) { // Sevear hackery to load views from custom places AND maintain compatibility with Modular Extensions if ($override_view_path !== NULL) { if ($this->_parser_enabled === TRUE AND $parse_view === TRUE) { // Load content and pass through the parser $content = $this->_ci->parser->parse_string($this->_ci->load->file( $override_view_path.$view.self::_ext($view), TRUE ), $data, TRUE); } else { $this->_ci->load->vars($data); // Load it directly, bypassing $this->load->view() as ME resets _ci_view $content = $this->_ci->load->file( $override_view_path.$view.self::_ext($view), TRUE ); } } // Can just run as usual else { // Grab the content of the view (parsed or loaded) $content = ($this->_parser_enabled === TRUE AND $parse_view === TRUE) // Parse that bad boy ? $this->_ci->parser->parse($view, $data, TRUE) // None of that fancy stuff for me! : $this->_ci->load->view($view, $data, TRUE); } return $content; } private function _guess_title() { $this->_ci->load->helper('inflector'); // Obviously no title, lets get making one $title_parts = array(); // If the method is something other than index, use that if ($this->_method != 'index') { $title_parts[] = $this->_method; } // Make sure controller name is not the same as the method name if ( ! in_array($this->_controller, $title_parts)) { $title_parts[] = $this->_controller; } // Is there a module? Make sure it is not named the same as the method or controller if ( ! empty($this->_module) AND ! in_array($this->_module, $title_parts)) { $title_parts[] = $this->_module; } // Glue the title pieces together using the title separator setting $title = humanize(implode($this->_title_separator, $title_parts)); return $title; } private function _ext($file) { return pathinfo($file, PATHINFO_EXTENSION) ? '' : '.php'; } }