tag. * * @var array $customScript */ protected static $customScript = array(); /** * All custom CSS rules which are inserted * directly at the bottom of the HTML tag. * * @var array $customCSS */ protected static $customCSS = array(); /** * All custom HTML markup which is added before * the closing tag, e.g. additional metatags. * This is preferred to entering tags directly into */ protected static $customHeadTags = array(); /** * Remembers the filepaths of all cleared Requirements * through {@link clear()}. * * @usedby {@link restore()} * * @var array $disabled */ protected static $disabled = array(); /** * The filepaths (relative to webroot) or * uniquenessIDs of any included requirements * which should be blocked when executing {@link inlcudeInHTML()}. * This is useful to e.g. prevent core classes to modifying * Requirements without subclassing the entire functionality. * Use {@link unblock()} or {@link unblock_all()} to revert changes. * * @var array $blocked */ protected static $blocked = array(); /** * See {@link combine_files()}. * * @var array $combine_files */ public static $combine_files = array(); /** * Using the JSMin library to minify any * javascript file passed to {@link combine_files()}. * * @var boolean */ public static $combine_js_with_jsmin = true; /** * Register the given javascript file as required. * Filenames should be relative to the base, eg, 'sapphire/javascript/loader.js' */ static function javascript($file) { Requirements::$javascript[$file] = true; } /** * Add the javascript code to the header of the page * @todo Make Requirements automatically put this into a separate file :-) * @param script The script content * @param uniquenessID Use this to ensure that pieces of code only get added once. */ static function customScript($script, $uniquenessID = null) { if($uniquenessID) Requirements::$customScript[$uniquenessID] = $script; else { Requirements::$customScript[] = $script; } $script .= "\n"; } /** * Add the CSS styling to the header of the page * @todo Make Requirements automatically put this into a separate file :-) */ static function customCSS($script, $uniquenessID = null) { if($uniquenessID) Requirements::$customCSS[$uniquenessID] = $script; else { Requirements::$customCSS[] = $script; } } /** * Add the following custom code to the section of the page. * * @param string $html * @param string $uniquenessID */ static function insertHeadTags($html, $uniquenessID = null) { if($uniquenessID) Requirements::$customHeadTags[$uniquenessID] = $html; else { Requirements::$customHeadTags[] = $html; } } /** * Load the given javascript template with the page. * @param file The template file to load. * @param vars The array of variables to load. These variables are loaded via string search & replace. */ static function javascriptTemplate($file, $vars, $uniquenessID = null) { $script = file_get_contents(Director::getAbsFile($file)); foreach($vars as $k => $v) { $search[] = '$' . $k; $replace[] = str_replace("\\'","'", Convert::raw2js($v)); } $script = str_replace($search, $replace, $script); Requirements::customScript($script, $uniquenessID); } /** * Register the given stylesheet file as required. * * @param $file String Filenames should be relative to the base, eg, 'jsparty/tree/tree.css' * @param $media String Comma-separated list of media-types (e.g. "screen,projector") * @see http://www.w3.org/TR/REC-CSS2/media.html */ static function css($file, $media = null) { Requirements::$css[$file] = array( "media" => $media ); } /** * Register the given "themeable stylesheet" as required. * Themeable stylesheets have globally unique names, just like templates and PHP files. * Because of this, they can be replaced by similarly named CSS files in the theme directory. * * @param $name String The identifier of the file. For example, css/MyFile.css would have the identifier "MyFile" * @param $media String Comma-separated list of media-types (e.g. "screen,projector") */ static function themedCSS($name, $media = null) { global $_CSS_MANIFEST; $theme = SSViewer::current_theme(); if($theme && isset($_CSS_MANIFEST[$name]) && isset($_CSS_MANIFEST[$name]['themes']) && isset($_CSS_MANIFEST[$name]['themes'][$theme])) Requirements::css($_CSS_MANIFEST[$name]['themes'][$theme], $media); else if(isset($_CSS_MANIFEST[$name]) && isset($_CSS_MANIFEST[$name]['unthemed'])) Requirements::css($_CSS_MANIFEST[$name]['unthemed'], $media); // Normal requirements fails quietly when there is no css - we should do the same // else user_error("themedCSS - No CSS file '$name.css' found.", E_USER_WARNING); } /** * Clear either a single or all requirements. * Caution: Clearing single rules works only with customCSS and customScript if you specified a {@uniquenessID}. * * @param $file String */ static function clear($fileOrID = null) { if($fileOrID) { foreach(array('javascript','css', 'customScript', 'customCSS') as $type) { if(isset(Requirements::${$type}[$fileOrID])) { Requirements::$disabled[$type][$fileOrID] = Requirements::${$type}[$fileOrID]; unset(Requirements::${$type}[$fileOrID]); } } } else { Requirements::$disabled['javascript'] = Requirements::$javascript; Requirements::$disabled['css'] = Requirements::$css; Requirements::$disabled['customScript'] = Requirements::$customScript; Requirements::$disabled['customCSS'] = Requirements::$customCSS; Requirements::$javascript = array(); Requirements::$css = array(); Requirements::$customScript = array(); Requirements::$customCSS = array(); } } /** * Needed to actively prevent the inclusion of a file, * e.g. when using your own prototype.js. * Blocking should only be used as an exception, because * it is hard to trace back. You can just block items with an * ID, so make sure you add an unique identifier to customCSS() and customScript(). * * @param string $fileOrID */ static function block($fileOrID) { self::$blocked[$fileOrID] = $fileOrID; } /** * Removes an item from the blocking-list. * CAUTION: Does not "re-add" any previously blocked elements. * @param string $fileOrID */ static function unblock($fileOrID) { if(isset(self::$blocked[$fileOrID])) unset(self::$blocked[$fileOrID]); } /** * Removes all items from the blocking-list. */ static function unblock_all() { self::$blocked = array(); } /** * Restore requirements cleared by call to Requirements::clear */ static function restore() { Requirements::$javascript = Requirements::$disabled['javascript']; Requirements::$css = Requirements::$disabled['css']; Requirements::$customScript = Requirements::$disabled['customScript']; Requirements::$customCSS = Requirements::$disabled['customCSS']; } /** * Update the given HTML content with the appropriate include tags for the registered * requirements. Needs to receive a valid HTML/XHTML template in the $content parameter, * including a tag. The requirements will insert before the closing tag automatically. * * @todo Calculate $prefix properly * * @param string $templateFilePath Absolute path for the *.ss template file * @param string $content HTML content that has already been parsed from the $templateFilePath through {@link SSViewer}. * @return string HTML content thats augumented with the requirements before the closing tag. */ static function includeInHTML($templateFilePath, $content) { if(isset($_GET['debug_profile'])) Profiler::mark("Requirements::includeInHTML"); if(strpos($content, ' $dummy) { if(substr($file,0,7) == 'http://' || Director::fileExists($file)) { $requirements .= "\n"; } } if(self::$customScript) { foreach(array_diff_key(self::$customScript,self::$blocked) as $script) { $requirements .= "\n"; } } $jsRequirements = $requirements; foreach(array_diff_key(self::$css,self::$blocked) as $file => $params) { if(Director::fileExists($file)) { $media = (isset($params['media']) && !empty($params['media'])) ? " media=\"{$params['media']}\"" : ""; $requirements .= "\n"; } } foreach(array_diff_key(self::$customCSS,self::$blocked) as $css) { $requirements .= "\n"; } foreach(array_diff_key(self::$customHeadTags,self::$blocked) as $customHeadTag) { $requirements .= "$customHeadTag\n"; } if(isset($_GET['debug_profile'])) Profiler::unmark("Requirements::includeInHTML"); return eregi_replace("(]*>)", $requirements . "\\1", $content); } /** * Concatenate several css or javascript files into a single dynamically generated * file (stored in {@link Director::baseFolder()}). This increases performance * by fewer HTTP requests. * * The combined file is regenerated * based on every file modification time. Optionally a rebuild can be triggered * by appending ?flush=1 to the URL. * If all files to be combined are javascript, we use the external JSMin library * to minify the javascript. This can be controlled by {@link $combine_js_with_jsmin}. * * All combined files will have a comment on the start of each concatenated file * denoting their original position. For easier debugging, we recommend to only * minify javascript if not in development mode ({@link Director::isDev()}). * * CAUTION: You're responsible for ensuring that the load order for combined files * is retained - otherwise combining javascript files can lead to functional errors * in the javascript logic, and combining css can lead to wrong styling inheritance. * Depending on the javascript logic, you also have to ensure that files are not included * in more than one combine_files() call. * Best practice is to include every javascript file in exactly *one* combine_files() * directive to avoid the issues mentioned above - this is enforced by this function. * * Example for combined JavaScript: * * Requirements::combine_files( * 'foobar.js', * array( * 'mysite/javascript/foo.js', * 'mysite/javascript/bar.js', * ) * ); * * * Example for combined CSS: * * Requirements::combine_files( * 'foobar.css', * array( * 'mysite/javascript/foo.css', * 'mysite/javascript/bar.css', * ) * ); * * * @see http://code.google.com/p/jsmin-php/ * * @todo Should we enforce unique inclusion of files, or leave it to the developer? Can auto-detection cause breaks? * * @param string $combinedFileName Filename of the combined file (will be stored in {@link Director::baseFolder()} by default) * @param array $files Array of filenames relative to the webroot */ static function combine_files($combinedFileName, $files) { // duplicate check foreach(self::$combine_files as $_combinedFileName => $_files) { $duplicates = array_intersect($_files, $files); if($duplicates) { user_error("Requirements::combine_files(): Already included files " . implode(',', $duplicates) . " in combined file '{$_combinedFileName}'", E_USER_NOTICE); return false; } } self::$combine_files[$combinedFileName] = $files; } /** * @return array */ static function get_combine_files() { return self::$combine_files; } /** * Deletes all dynamically generated combined files * from the filesystem. * * @param string $combinedFileName If left blank, all combined files are deleted. */ static function clear_combined_files($combinedFileName = null) { $combinedFiles = ($combinedFileName) ? array($combinedFileName => null) : self::$combine_files; foreach($combinedFiles as $combinedFile => $sourceItems) { $filePath = Director::baseFolder() . '/' . $combinedFile; if(file_exists($filePath)) { unlink($filePath); } } } /** * See {@link combine_files()}. */ static function process_combined_files() { // Make a map of files that could be potentially combined $combinerCheck = array(); foreach(self::$combine_files as $combinedFile => $sourceItems) { foreach($sourceItems as $sourceItem) { if(isset($combinerCheck[$sourceItem]) && $combinerCheck[$sourceItem] != $combinedFile){ user_error("Requirements::process_combined_files - file '$sourceItem' appears in two combined files:" . " '{$combinerCheck[$sourceItem]}' and '$combinedFile'", E_USER_WARNING); } $combinerCheck[$sourceItem] = $combinedFile; } } // Figure out which ones apply to this pageview $combinedFiles = array(); $newJSRequirements = array(); $newCSSRequirements = array(); foreach(Requirements::$javascript as $file => $dummy) { if(isset($combinerCheck[$file])) { $newJSRequirements[$combinerCheck[$file]] = true; $combinedFiles[$combinerCheck[$file]] = true; } else { $newJSRequirements[$file] = true; } } foreach(Requirements::$css as $file => $params) { if(isset($combinerCheck[$file])) { $newCSSRequirements[$combinerCheck[$file]] = true; $combinedFiles[$combinerCheck[$file]] = true; } else { $newCSSRequirements[$file] = $params; } } // @todo Alters the original information, which means you can't call this // method repeatedly - it will behave different on the second call! Requirements::$javascript = $newJSRequirements; Requirements::$css = $newCSSRequirements; // Process the combined files $base = Director::baseFolder() . '/'; foreach(array_diff_key($combinedFiles,self::$blocked) as $combinedFile => $dummy) { $fileList = self::$combine_files[$combinedFile]; // Determine if we need to build the combined include if(file_exists($base . $combinedFile) && !isset($_GET['flush'])) { // file exists, check modification date of every contained file $srcLastMod = 0; foreach($fileList as $file) { $srcLastMod = max(filemtime($base . $file), $srcLastMod); } $refresh = $srcLastMod > filemtime($base . $combinedFile); } else { // file doesn't exist, or refresh was explicitly required $refresh = true; } if(!$refresh) continue; $combinedData = ""; foreach(array_diff($fileList,self::$blocked) as $file) { $fileContent = file_get_contents($base . $file); // if we have a javascript file and jsmin is enabled, minify the content if(stripos($file, '.js') && self::$combine_js_with_jsmin) { $fileContent = JSMin::minify($fileContent); } // write a header comment for each file for easier identification and debugging $combinedData .= "/****** FILE: $file *****/\n" . $fileContent . "\n"; } if(!file_exists(dirname($base . $combinedFile))) { Filesytem::makeFolder(dirname($base . $combinedFile)); } $fh = fopen($base . $combinedFile, 'w'); fwrite($fh, $combinedData); fclose($fh); unset($fh); } } static function get_custom_scripts() { $requirements = ""; if(Requirements::$customScript) { foreach(Requirements::$customScript as $script) { $requirements .= "$script\n"; } } return $requirements; } static function debug() { Debug::show(Requirements::$javascript); Debug::show(Requirements::$css); Debug::show(Requirements::$customCSS); Debug::show(Requirements::$customScript); Debug::show(Requirements::$customHeadTags); Debug::show(Requirements::$combine_files); } } ?>