2007-07-19 12:40:28 +02:00
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<?php
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/**
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* Requirements tracker, for javascript and css.
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* @todo Document the requirements tracker, and discuss it with the others.
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*/
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class Requirements {
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private static $javascript = array();
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private static $css = array();
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private static $customScript = array();
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private static $customCSS = array();
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private static $customHeadTags = "";
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private static $disabled = array();
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2007-12-17 22:49:49 +01:00
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private static $blocked = array();
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2007-07-19 12:40:28 +02:00
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/**
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* Register the given javascript file as required.
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* Filenames should be relative to the base, eg, 'sapphire/javascript/loader.js'
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*/
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static function javascript($file) {
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Requirements::$javascript[$file] = true;
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}
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/**
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* Add the javascript code to the header of the page
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* @todo Make Requirements automatically put this into a separate file :-)
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* @param script The script content
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* @param uniquenessID Use this to ensure that pieces of code only get added once.
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*/
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static function customScript($script, $uniquenessID = null) {
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if($uniquenessID)
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Requirements::$customScript[$uniquenessID] = $script;
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else {
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Requirements::$customScript[] = $script;
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}
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$script .= "\n";
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}
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/**
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* Add the CSS styling to the header of the page
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* @todo Make Requirements automatically put this into a separate file :-)
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*/
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static function customCSS($script, $uniquenessID = null) {
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if($uniquenessID)
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Requirements::$customCSS[$uniquenessID] = $script;
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else {
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Requirements::$customCSS[] = $script;
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}
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}
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/**
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* Add the following custom code to the <head> section of the page
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*/
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static function insertHeadTags($tags) {
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Requirements::$customHeadTags .= $tags . "\n";
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}
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/**
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* Load the given javascript template with the page.
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* @param file The template file to load.
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* @param vars The array of variables to load. These variables are loaded via string search & replace.
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*/
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static function javascriptTemplate($file, $vars, $uniquenessID = null) {
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$script = file_get_contents(Director::getAbsFile($file));
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foreach($vars as $k => $v) {
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$search[] = '$' . $k;
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$replace[] = str_replace("\\'","'", Convert::raw2js($v));
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}
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$script = str_replace($search, $replace, $script);
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Requirements::customScript($script, $uniquenessID);
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}
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/**
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* Register the given stylesheet file as required.
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*
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* @param $file String Filenames should be relative to the base, eg, 'jsparty/tree/tree.css'
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* @param $media String Comma-separated list of media-types (e.g. "screen,projector")
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* @see http://www.w3.org/TR/REC-CSS2/media.html
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*/
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static function css($file, $media = null) {
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Requirements::$css[$file] = array(
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"media" => $media
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);
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}
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/**
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* Register the given "themeable stylesheet" as required.
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* Themeable stylesheets have globally unique names, just like templates and PHP files.
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* Because of this, they can be replaced by similarly named CSS files in the theme directory.
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*
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* @param $name String The identifier of the file. For example, css/MyFile.css would have the identifier "MyFile"
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* @param $media String Comma-separated list of media-types (e.g. "screen,projector")
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*/
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static function themedCSS($name, $media = null) {
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global $_CSS_MANIFEST;
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$theme = SSViewer::current_theme();
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if($theme && isset($_CSS_MANIFEST[$name]) && isset($_CSS_MANIFEST[$name]['themes'])
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&& isset($_CSS_MANIFEST[$name]['themes'][$theme]))
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Requirements::css($_CSS_MANIFEST[$name]['themes'][$theme], $media);
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2007-08-07 01:24:22 +02:00
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else if(isset($_CSS_MANIFEST[$name]) && isset($_CSS_MANIFEST[$name]['unthemed'])) Requirements::css($_CSS_MANIFEST[$name]['unthemed'], $media);
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// Normal requirements fails quietly when there is no css - we should do the same
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// else user_error("themedCSS - No CSS file '$name.css' found.", E_USER_WARNING);
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2007-07-19 12:40:28 +02:00
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}
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/**
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* Clear either a single or all requirements.
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* Caution: Clearing single rules works only with customCSS and customScript if you specified a {@uniquenessID}.
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*
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* @param $file String
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*/
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static function clear($fileOrID = null) {
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if($fileOrID) {
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foreach(array('javascript','css', 'customScript', 'customCSS') as $type) {
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2007-12-04 05:09:07 +01:00
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if(isset(Requirements::${$type}[$fileOrID])) {
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2007-07-19 12:40:28 +02:00
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Requirements::$disabled[$type][$fileOrID] = Requirements::${$type}[$fileOrID];
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unset(Requirements::${$type}[$fileOrID]);
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}
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}
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} else {
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Requirements::$disabled['javascript'] = Requirements::$javascript;
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Requirements::$disabled['css'] = Requirements::$css;
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Requirements::$disabled['customScript'] = Requirements::$customScript;
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Requirements::$disabled['customCSS'] = Requirements::$customCSS;
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Requirements::$javascript = array();
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Requirements::$css = array();
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Requirements::$customScript = array();
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Requirements::$customCSS = array();
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}
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}
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2007-12-17 22:49:49 +01:00
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/**
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* Needed to actively prevent the inclusion of a file,
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* e.g. when using your own prototype.js.
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* Blocking should only be used as an exception, because
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* it is hard to trace back. You can just block items with an
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* ID, so make sure you add an unique identifier to customCSS() and customScript().
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*
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* @param string $fileOrID
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*/
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static function block($fileOrID) {
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self::$blocked[$fileOrID] = $fileOrID;
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}
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/**
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* Removes an item from the blocking-list.
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* CAUTION: Does not "re-add" any previously blocked elements.
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* @param string $fileOrID
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*/
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static function unblock($fileOrID) {
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unset(self::$blocked[$fileOrID]);
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}
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/**
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* Removes all items from the blocking-list.
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*/
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static function unblock_all() {
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self::$blocked = array();
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}
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2007-07-19 12:40:28 +02:00
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/**
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* Restore requirements cleared by call to Requirements::clear
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*/
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static function restore() {
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Requirements::$javascript = Requirements::$disabled['javascript'];
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Requirements::$css = Requirements::$disabled['css'];
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Requirements::$customScript = Requirements::$disabled['customScript'];
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Requirements::$customCSS = Requirements::$disabled['customCSS'];
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}
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/**
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* Update the given HTML content with the appropriate include tags for the registered
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* requirements.
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* @todo Calculate $prefix properly
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*/
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static function includeInHTML($templateFile, $content) {
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if(isset($_GET['debug_profile'])) Profiler::mark("Requirements::includeInHTML");
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if(strpos($content, '</head') !== false && (Requirements::$javascript || Requirements::$css || Requirements::$customScript || Requirements::$customHeadTags)) {
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$prefix = "";
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$requirements = '';
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2007-12-17 22:49:49 +01:00
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foreach(array_diff_key(self::$javascript,self::$blocked) as $file => $dummy) {
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2007-07-19 12:40:28 +02:00
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if(substr($file,0,7) == 'http://' || Director::fileExists($file)) {
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$requirements .= "<script type=\"text/javascript\" src=\"$prefix$file\"></script>\n";
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}
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}
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2007-12-17 22:49:49 +01:00
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if(self::$customScript) {
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2007-07-19 12:40:28 +02:00
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$requirements .= "<script type=\"text/javascript\">\n//<![CDATA[\n";
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2007-12-17 22:49:49 +01:00
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foreach(array_diff_key(self::$customScript,self::$blocked) as $script) {
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2007-07-19 12:40:28 +02:00
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$requirements .= "$script\n";
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}
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$requirements .= "\n//]]>\n</script>\n";
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}
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2007-12-17 22:49:49 +01:00
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foreach(array_diff_key(self::$css,self::$blocked) as $file => $params) {
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2007-07-19 12:40:28 +02:00
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if(Director::fileExists($file)) {
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$media = (isset($params['media'])) ? " media=\"{$params['media']}\"" : "";
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$requirements .= "<link rel=\"stylesheet\" type=\"text/css\"{$media} href=\"$prefix$file\" />\n";
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}
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}
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2007-12-17 22:49:49 +01:00
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foreach(array_diff_key(self::$customCSS,self::$blocked) as $css) {
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2007-07-19 12:40:28 +02:00
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$requirements .= "<style type=\"text/css\">\n$css\n</style>\n";
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}
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2007-12-17 22:49:49 +01:00
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$requirements .= self::$customHeadTags;
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2007-07-19 12:40:28 +02:00
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if(isset($_GET['debug_profile'])) Profiler::unmark("Requirements::includeInHTML");
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return eregi_replace("(</head[^>]*>)", $requirements . "\\1", $content);
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} else {
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if(isset($_GET['debug_profile'])) Profiler::unmark("Requirements::includeInHTML");
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return $content;
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}
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}
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static function get_custom_scripts() {
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$requirements = "";
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if(Requirements::$customScript) {
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foreach(Requirements::$customScript as $script) {
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$requirements .= "$script\n";
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}
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}
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return $requirements;
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}
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static function debug() {
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Debug::show(Requirements::$javascript);
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Debug::show(Requirements::$css);
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Debug::show(Requirements::$customCSS);
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Debug::show(Requirements::$customScript);
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Debug::show(Requirements::$customHeadTags);
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}
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}
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?>
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