569 lines
19 KiB
PHP
569 lines
19 KiB
PHP
<?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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* @package sapphire
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* @subpackage view
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*/
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class Requirements {
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/**
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* Paths to all required .js files relative to the webroot.
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*
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* @var array $javascript
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*/
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protected static $javascript = array();
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/**
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* Paths to all required .css files relative to the webroot.
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*
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* @var array $javascript
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*/
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protected static $css = array();
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/**
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* All custom javascript code that is inserted
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* directly at the bottom of the HTML <head> tag.
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*
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* @var array $customScript
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*/
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protected static $customScript = array();
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/**
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* All custom CSS rules which are inserted
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* directly at the bottom of the HTML <head> tag.
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*
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* @var array $customCSS
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*/
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protected static $customCSS = array();
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/**
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* All custom HTML markup which is added before
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* the closing <head> tag, e.g. additional metatags.
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* This is preferred to entering tags directly into
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*/
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protected static $customHeadTags = array();
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/**
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* Remembers the filepaths of all cleared Requirements
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* through {@link clear()}.
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*
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* @usedby {@link restore()}
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*
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* @var array $disabled
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*/
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protected static $disabled = array();
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/**
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* The filepaths (relative to webroot) or
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* uniquenessIDs of any included requirements
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* which should be blocked when executing {@link inlcudeInHTML()}.
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* This is useful to e.g. prevent core classes to modifying
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* Requirements without subclassing the entire functionality.
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* Use {@link unblock()} or {@link unblock_all()} to revert changes.
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*
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* @var array $blocked
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*/
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protected static $blocked = array();
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/**
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* See {@link combine_files()}.
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*
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* @var array $combine_files
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*/
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public static $combine_files = array();
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/**
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* Using the JSMin library to minify any
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* javascript file passed to {@link combine_files()}.
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*
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* @var boolean
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*/
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public static $combine_js_with_jsmin = true;
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/**
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* Put all javascript includes at the bottom of the template
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* before the closing <body> tag instead of the <head> tag.
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* This means script downloads won't block other HTTP-requests,
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* which can be a performance improvement.
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* Caution: Doesn't work when modifying the DOM from those external
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* scripts without listening to window.onload/document.ready
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* (e.g. toplevel document.write() calls).
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*
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* @see http://developer.yahoo.com/performance/rules.html#js_bottom
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*
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* @var boolean
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*/
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public static $write_js_to_body = false;
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/**
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* Register the given javascript file as required.
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* Filenames should be relative to the base, eg, 'sapphire/javascript/loader.js'
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*/
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static function javascript($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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* @param string $html
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* @param string $uniquenessID
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*/
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static function insertHeadTags($html, $uniquenessID = null) {
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if($uniquenessID)
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Requirements::$customHeadTags[$uniquenessID] = $html;
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else {
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Requirements::$customHeadTags[] = $html;
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}
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}
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/**
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* Load the given javascript template with the page.
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* @param file The template file to load.
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* @param vars The array of variables to load. These variables are loaded via string search & replace.
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*/
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static function javascriptTemplate($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], $media);
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else if(isset($_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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}
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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 $type) {
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if(isset(Requirements::${$type}[$fileOrID])) {
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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::$customCSS = array();
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Requirements::$customHeadTags = array();
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}
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}
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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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if(isset(self::$blocked[$fileOrID])) 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::$blocked = array();
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}
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/**
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* Restore requirements cleared by call to Requirements::clear
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*/
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static function restore() {
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Requirements::$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. Needs to receive a valid HTML/XHTML template in the $content parameter,
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* including a <head> tag. The requirements will insert before the closing <head> tag automatically.
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*
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* @todo Calculate $prefix properly
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*
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* @param string $templateFilePath Absolute path for the *.ss template file
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* @param string $content HTML content that has already been parsed from the $templateFilePath through {@link SSViewer}.
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* @return string HTML content thats augumented with the requirements before the closing <head> tag.
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*/
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static function includeInHTML($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::$customHeadTags)) {
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$requirements = '';
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$jsRequirements = '';
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// Combine files - updates Requirements::$javascript and Requirements::$css
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self::process_combined_files();
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foreach(array_diff_key(self::$javascript,self::$blocked) as $file => $dummy) {
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$path = self::path_for_file($file);
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if($path) {
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$jsRequirements .= "<script type=\"text/javascript\" src=\"$path\"></script>\n";
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}
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}
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// add all inline javascript *after* including external files which
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// they might rely on
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if(self::$customScript) {
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foreach(array_diff_key(self::$customScript,self::$blocked) as $script) {
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$jsRequirements .= "<script type=\"text/javascript\">\n//<![CDATA[\n";
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$jsRequirements .= "$script\n";
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$jsRequirements .= "\n//]]>\n</script>\n";
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}
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}
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foreach(array_diff_key(self::$css,self::$blocked) as $file => $params) {
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$path = self::path_for_file($file);
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if($path) {
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$media = (isset($params['media']) && !empty($params['media'])) ? " media=\"{$params['media']}\"" : "";
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$requirements .= "<link rel=\"stylesheet\" type=\"text/css\"{$media} href=\"$path\" />\n";
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}
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}
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foreach(array_diff_key(self::$customCSS,self::$blocked) as $css) {
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$requirements .= "<style type=\"text/css\">\n$css\n</style>\n";
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}
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foreach(array_diff_key(self::$customHeadTags,self::$blocked) as $customHeadTag) {
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$requirements .= "$customHeadTag\n";
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}
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if(self::$write_js_to_body) {
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// Remove all newlines from code to preserve layout
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$jsRequirements = preg_replace('/>\n*/', '>', $jsRequirements);
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// We put script tags into the body, for performance.
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// If your template already has script tags in the body, then we put our script tags at the top of the body.
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// Otherwise, we put it at the bottom.
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$p1 = strripos($content, '<script');
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$p2 = stripos($content, '<body');
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if($p1 !== false && $p1 > $p2) {
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user_error("You have a script tag in the body, moving requirements to top of <body> for compatibilty. I recommend removing the script tag from your template's body.", E_USER_NOTICE);
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$content = eregi_replace("(<body[^>]*>)", "\\1" . $jsRequirements, $content);
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} else {
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$content = eregi_replace("(</body[^>]*>)", $jsRequirements . "\\1", $content);
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}
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// Put CSS at the bottom of the head
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$content = eregi_replace("(</head[^>]*>)", $requirements . "\\1", $content);
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} else {
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$content = eregi_replace("(</head[^>]*>)", $requirements . "\\1", $content);
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$content = eregi_replace("(</head[^>]*>)", $jsRequirements . "\\1", $content);
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}
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}
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if(isset($_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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*
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*
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* @param string $fileOrUrl
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* @return string|boolean
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*/
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protected static function path_for_file($fileOrUrl) {
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if(preg_match('/^http[s]?/', $fileOrUrl)) {
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return $fileOrUrl;
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} elseif(Director::fileExists($fileOrUrl)) {
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$prefix = Director::absoluteBaseURL();
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$mtimesuffix = "?m=" . filemtime(Director::baseFolder() . '/' . $fileOrUrl);
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return "{$prefix}{$fileOrUrl}{$mtimesuffix}";
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} else {
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return false;
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}
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}
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/**
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* Concatenate several css or javascript files into a single dynamically generated
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* file (stored in {@link Director::baseFolder()}). This increases performance
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* by fewer HTTP requests.
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*
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* The combined file is regenerated
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* based on every file modification time. Optionally a rebuild can be triggered
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* by appending ?flush=1 to the URL.
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* If all files to be combined are javascript, we use the external JSMin library
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* to minify the javascript. This can be controlled by {@link $combine_js_with_jsmin}.
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*
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* All combined files will have a comment on the start of each concatenated file
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* denoting their original position. For easier debugging, we recommend to only
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* minify javascript if not in development mode ({@link Director::isDev()}).
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*
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* CAUTION: You're responsible for ensuring that the load order for combined files
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* is retained - otherwise combining javascript files can lead to functional errors
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* in the javascript logic, and combining css can lead to wrong styling inheritance.
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* Depending on the javascript logic, you also have to ensure that files are not included
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* in more than one combine_files() call.
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* Best practice is to include every javascript file in exactly *one* combine_files()
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* directive to avoid the issues mentioned above - this is enforced by this function.
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*
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* Example for combined JavaScript:
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* <code>
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* Requirements::combine_files(
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* 'foobar.js',
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* array(
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* 'mysite/javascript/foo.js',
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* 'mysite/javascript/bar.js',
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* )
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* );
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* </code>
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*
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* Example for combined CSS:
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* <code>
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* Requirements::combine_files(
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* 'foobar.css',
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* array(
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* 'mysite/javascript/foo.css',
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* 'mysite/javascript/bar.css',
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* )
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* );
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* </code>
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*
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* @see http://code.google.com/p/jsmin-php/
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*
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* @todo Should we enforce unique inclusion of files, or leave it to the developer? Can auto-detection cause breaks?
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*
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* @param string $combinedFileName Filename of the combined file (will be stored in {@link Director::baseFolder()} by default)
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* @param array $files Array of filenames relative to the webroot
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*/
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static function combine_files($combinedFileName, $files) {
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// duplicate check
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foreach(self::$combine_files as $_combinedFileName => $_files) {
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$duplicates = array_intersect($_files, $files);
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if($duplicates) {
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user_error("Requirements::combine_files(): Already included files " . implode(',', $duplicates) . " in combined file '{$_combinedFileName}'", E_USER_NOTICE);
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return false;
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}
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}
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self::$combine_files[$combinedFileName] = $files;
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}
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/**
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* @return array
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*/
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static function get_combine_files() {
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return self::$combine_files;
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}
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/**
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* Deletes all dynamically generated combined files from the filesystem.
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*
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* @param string $combinedFileName If left blank, all combined files are deleted.
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*/
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static function delete_combined_files($combinedFileName = null) {
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$combinedFiles = ($combinedFileName) ? array($combinedFileName => null) : self::$combine_files;
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foreach($combinedFiles as $combinedFile => $sourceItems) {
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$filePath = Director::baseFolder() . '/' . $combinedFile;
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if(file_exists($filePath)) {
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unlink($filePath);
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}
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}
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}
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/**
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* Re-sets the combined files definition
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*/
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static function clear_combined_files() {
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self::$combine_files = array();
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}
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/**
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* See {@link combine_files()}.
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*/
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static function process_combined_files() {
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// Make a map of files that could be potentially combined
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$combinerCheck = array();
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foreach(self::$combine_files as $combinedFile => $sourceItems) {
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foreach($sourceItems as $sourceItem) {
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if(isset($combinerCheck[$sourceItem]) && $combinerCheck[$sourceItem] != $combinedFile){
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user_error("Requirements::process_combined_files - file '$sourceItem' appears in two combined files:" . " '{$combinerCheck[$sourceItem]}' and '$combinedFile'", E_USER_WARNING);
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}
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$combinerCheck[$sourceItem] = $combinedFile;
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}
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}
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// Figure out which ones apply to this pageview
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$combinedFiles = array();
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$newJSRequirements = array();
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$newCSSRequirements = array();
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foreach(Requirements::$javascript as $file => $dummy) {
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if(isset($combinerCheck[$file])) {
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$newJSRequirements[$combinerCheck[$file]] = true;
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$combinedFiles[$combinerCheck[$file]] = true;
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} else {
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$newJSRequirements[$file] = true;
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}
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}
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foreach(Requirements::$css as $file => $params) {
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if(isset($combinerCheck[$file])) {
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$newCSSRequirements[$combinerCheck[$file]] = true;
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$combinedFiles[$combinerCheck[$file]] = true;
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} else {
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$newCSSRequirements[$file] = $params;
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}
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}
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|
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// @todo Alters the original information, which means you can't call this
|
|
// method repeatedly - it will behave different on the second call!
|
|
Requirements::$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[$combinedFile];
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|
|
|
// Determine if we need to build the combined include
|
|
if(file_exists($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) {
|
|
require_once('thirdparty/jsmin/JSMin.php');
|
|
$fileContent = JSMin::minify($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);
|
|
}
|
|
}
|
|
|
|
|
|
?>
|