xref: /dokuwiki/lib/exe/css.php (revision 23ae1b94a29fd9c3219a8cb37f3f2e21fbe03bc6) 
1<?php
2/**
3 * DokuWiki StyleSheet creator
4 *
5 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
6 * @author     Andreas Gohr <andi@splitbrain.org>
7 */
8
9if(!defined('DOKU_INC')) define('DOKU_INC',dirname(__FILE__).'/../../');
10if(!defined('NOSESSION')) define('NOSESSION',true); // we do not use a session or authentication here (better caching)
11if(!defined('DOKU_DISABLE_GZIP_OUTPUT')) define('DOKU_DISABLE_GZIP_OUTPUT',1); // we gzip ourself here
12require_once(DOKU_INC.'inc/init.php');
13
14// Main (don't run when UNIT test)
15if(!defined('SIMPLE_TEST')){
16    header('Content-Type: text/css; charset=utf-8');
17    css_out();
18}
19
20
21// ---------------------- functions ------------------------------
22
23/**
24 * Output all needed Styles
25 *
26 * @author Andreas Gohr <andi@splitbrain.org>
27 */
28function css_out(){
29    global $conf;
30    global $lang;
31    global $config_cascade;
32
33    $mediatype = 'screen';
34    if (isset($_REQUEST['s']) &&
35        in_array($_REQUEST['s'], array('all', 'print', 'feed'))) {
36        $mediatype = $_REQUEST['s'];
37    }
38
39    $tpl = trim(preg_replace('/[^\w-]+/','',$_REQUEST['t']));
40    if($tpl){
41        $tplinc = DOKU_INC.'lib/tpl/'.$tpl.'/';
42        $tpldir = DOKU_BASE.'lib/tpl/'.$tpl.'/';
43    }else{
44        $tplinc = DOKU_TPLINC;
45        $tpldir = DOKU_TPL;
46    }
47
48    // The generated script depends on some dynamic options
49    $cache = getCacheName('styles'.$_SERVER['HTTP_HOST'].$_SERVER['SERVER_PORT'].DOKU_BASE.$tplinc.$mediatype,'.css');
50
51    // load template styles
52    $tplstyles = array();
53    if(@file_exists($tplinc.'style.ini')){
54        $ini = parse_ini_file($tplinc.'style.ini',true);
55        foreach($ini['stylesheets'] as $file => $mode){
56            $tplstyles[$mode][$tplinc.$file] = $tpldir;
57        }
58    }
59
60    // Array of needed files and their web locations, the latter ones
61    // are needed to fix relative paths in the stylesheets
62    $files   = array();
63    // load core styles
64    $files[DOKU_INC.'lib/styles/'.$mediatype.'.css'] = DOKU_BASE.'lib/styles/';
65    // load plugin styles
66    $files = array_merge($files, css_pluginstyles($mediatype));
67    // load template styles
68    if (isset($tplstyles[$mediatype])) {
69        $files = array_merge($files, $tplstyles[$mediatype]);
70    }
71    // if old 'default' userstyle setting exists, make it 'screen' userstyle for backwards compatibility
72    if (isset($config_cascade['userstyle']['default'])) {
73        $config_cascade['userstyle']['screen'] = $config_cascade['userstyle']['default'];
74    }
75    // load user styles
76    if(isset($config_cascade['userstyle'][$mediatype])){
77        $files[$config_cascade['userstyle'][$mediatype]] = DOKU_BASE;
78    }
79    // load rtl styles
80    // @todo: this currently adds the rtl styles only to the 'screen' media type
81    //        but 'print' and 'all' should also be supported
82    if ($mediatype=='screen') {
83        if($lang['direction'] == 'rtl'){
84            if (isset($tplstyles['rtl'])) $files = array_merge($files, $tplstyles['rtl']);
85        }
86    }
87
88    // check cache age & handle conditional request
89    header('Cache-Control: public, max-age=3600');
90    header('Pragma: public');
91    if(css_cacheok($cache,array_keys($files),$tplinc)){
92        http_conditionalRequest(filemtime($cache));
93        if($conf['allowdebug']) header("X-CacheUsed: $cache");
94
95        // finally send output
96        if ($conf['gzip_output'] && http_gzip_valid($cache)) {
97          header('Vary: Accept-Encoding');
98          header('Content-Encoding: gzip');
99          readfile($cache.".gz");
100        } else {
101          if (!http_sendfile($cache)) readfile($cache);
102        }
103
104        return;
105    } else {
106        http_conditionalRequest(time());
107    }
108
109    // start output buffering and build the stylesheet
110    ob_start();
111
112    // print the default classes for interwiki links and file downloads
113    css_interwiki();
114    css_filetypes();
115
116    // load files
117    foreach($files as $file => $location){
118        print css_loadfile($file, $location);
119    }
120
121    // end output buffering and get contents
122    $css = ob_get_contents();
123    ob_end_clean();
124
125    // apply style replacements
126    $css = css_applystyle($css,$tplinc);
127
128    // place all @import statements at the top of the file
129    $css = css_moveimports($css);
130
131    // compress whitespace and comments
132    if($conf['compress']){
133        $css = css_compress($css);
134    }
135
136    // save cache file
137    io_saveFile($cache,$css);
138    if(function_exists('gzopen')) io_saveFile("$cache.gz",$css);
139
140    // finally send output
141    if ($conf['gzip_output']) {
142      header('Vary: Accept-Encoding');
143      header('Content-Encoding: gzip');
144      print gzencode($css,9,FORCE_GZIP);
145    } else {
146      print $css;
147    }
148}
149
150/**
151 * Checks if a CSS Cache file still is valid
152 *
153 * @author Andreas Gohr <andi@splitbrain.org>
154 */
155function css_cacheok($cache,$files,$tplinc){
156    global $config_cascade;
157
158    if(isset($_REQUEST['purge'])) return false; //support purge request
159
160    $ctime = @filemtime($cache);
161    if(!$ctime) return false; //There is no cache
162
163    // some additional files to check
164    $files = array_merge($files, getConfigFiles('main'));
165    $files[] = $tplinc.'style.ini';
166    $files[] = __FILE__;
167
168    // now walk the files
169    foreach($files as $file){
170        if(@filemtime($file) > $ctime){
171            return false;
172        }
173    }
174    return true;
175}
176
177/**
178 * Does placeholder replacements in the style according to
179 * the ones defined in a templates style.ini file
180 *
181 * @author Andreas Gohr <andi@splitbrain.org>
182 */
183function css_applystyle($css,$tplinc){
184    if(@file_exists($tplinc.'style.ini')){
185        $ini = parse_ini_file($tplinc.'style.ini',true);
186        $css = strtr($css,$ini['replacements']);
187    }
188    return $css;
189}
190
191/**
192 * Prints classes for interwikilinks
193 *
194 * Interwiki links have two classes: 'interwiki' and 'iw_$name>' where
195 * $name is the identifier given in the config. All Interwiki links get
196 * an default style with a default icon. If a special icon is available
197 * for an interwiki URL it is set in it's own class. Both classes can be
198 * overwritten in the template or userstyles.
199 *
200 * @author Andreas Gohr <andi@splitbrain.org>
201 */
202function css_interwiki(){
203
204    // default style
205    echo 'a.interwiki {';
206    echo ' background: transparent url('.DOKU_BASE.'lib/images/interwiki.png) 0px 1px no-repeat;';
207    echo ' padding: 1px 0px 1px 16px;';
208    echo '}';
209
210    // additional styles when icon available
211    $iwlinks = getInterwiki();
212    foreach(array_keys($iwlinks) as $iw){
213        $class = preg_replace('/[^_\-a-z0-9]+/i','_',$iw);
214        if(@file_exists(DOKU_INC.'lib/images/interwiki/'.$iw.'.png')){
215            echo "a.iw_$class {";
216            echo '  background-image: url('.DOKU_BASE.'lib/images/interwiki/'.$iw.'.png)';
217            echo '}';
218        }elseif(@file_exists(DOKU_INC.'lib/images/interwiki/'.$iw.'.gif')){
219            echo "a.iw_$class {";
220            echo '  background-image: url('.DOKU_BASE.'lib/images/interwiki/'.$iw.'.gif)';
221            echo '}';
222        }
223    }
224}
225
226/**
227 * Prints classes for file download links
228 *
229 * @author Andreas Gohr <andi@splitbrain.org>
230 */
231function css_filetypes(){
232
233    // default style
234    echo 'a.mediafile {';
235    echo ' background: transparent url('.DOKU_BASE.'lib/images/fileicons/file.png) 0px 1px no-repeat;';
236    echo ' padding-left: 18px;';
237    echo ' padding-bottom: 1px;';
238    echo '}';
239
240    // additional styles when icon available
241    // scan directory for all icons
242    $exts = array();
243    if($dh = opendir(DOKU_INC.'lib/images/fileicons')){
244        while(false !== ($file = readdir($dh))){
245            if(preg_match('/([_\-a-z0-9]+(?:\.[_\-a-z0-9]+)*?)\.(png|gif)/i',$file,$match)){
246                $ext = strtolower($match[1]);
247                $type = '.'.strtolower($match[2]);
248                if($ext!='file' && (!isset($exts[$ext]) || $type=='.png')){
249                    $exts[$ext] = $type;
250                }
251            }
252        }
253        closedir($dh);
254    }
255    foreach($exts as $ext=>$type){
256        $class = preg_replace('/[^_\-a-z0-9]+/','_',$ext);
257        echo "a.mf_$class {";
258        echo '  background-image: url('.DOKU_BASE.'lib/images/fileicons/'.$ext.$type.')';
259        echo '}';
260    }
261}
262
263/**
264 * Loads a given file and fixes relative URLs with the
265 * given location prefix
266 */
267function css_loadfile($file,$location=''){
268    if(!@file_exists($file)) return '';
269    $css = io_readFile($file);
270    if(!$location) return $css;
271
272    $css = preg_replace('#(url\([ \'"]*)(?!/|http://|https://| |\'|")#','\\1'.$location,$css);
273    $css = preg_replace('#(@import\s+[\'"])(?!/|http://|https://)#', '\\1'.$location, $css);
274    return $css;
275}
276
277
278/**
279 * Returns a list of possible Plugin Styles (no existance check here)
280 *
281 * @author Andreas Gohr <andi@splitbrain.org>
282 */
283function css_pluginstyles($mediatype='screen'){
284    global $lang;
285    $list = array();
286    $plugins = plugin_list();
287    foreach ($plugins as $p){
288        $list[DOKU_PLUGIN."$p/$mediatype.css"]  = DOKU_BASE."lib/plugins/$p/";
289        // alternative for screen.css
290        if ($mediatype=='screen') {
291            $list[DOKU_PLUGIN."$p/style.css"]  = DOKU_BASE."lib/plugins/$p/";
292        }
293        if($lang['direction'] == 'rtl'){
294            $list[DOKU_PLUGIN."$p/rtl.css"] = DOKU_BASE."lib/plugins/$p/";
295        }
296    }
297    return $list;
298}
299
300/**
301 * Move all @import statements in a combined stylesheet to the top so they
302 * aren't ignored by the browser.
303 *
304 * @author Gabriel Birke <birke@d-scribe.de>
305 */
306function css_moveimports($css)
307{
308    if(!preg_match_all('/@import\s+(?:url\([^)]+\)|"[^"]+")\s*[^;]*;\s*/', $css, $matches, PREG_OFFSET_CAPTURE)) {
309        return $css;
310    }
311    $newCss  = "";
312    $imports = "";
313    $offset  = 0;
314    foreach($matches[0] as $match) {
315        $newCss  .= substr($css, $offset, $match[1] - $offset);
316        $imports .= $match[0];
317        $offset   = $match[1] + strlen($match[0]);
318    }
319    $newCss .= substr($css, $offset);
320    return $imports.$newCss;
321}
322
323/**
324 * Very simple CSS optimizer
325 *
326 * @author Andreas Gohr <andi@splitbrain.org>
327 */
328function css_compress($css){
329    //strip comments through a callback
330    $css = preg_replace_callback('#(/\*)(.*?)(\*/)#s','css_comment_cb',$css);
331
332    //strip (incorrect but common) one line comments
333    $css = preg_replace('/(?<!:)\/\/.*$/m','',$css);
334
335    // strip whitespaces
336    $css = preg_replace('![\r\n\t ]+!',' ',$css);
337    $css = preg_replace('/ ?([:;,{}\/]) ?/','\\1',$css);
338
339    // shorten colors
340    $css = preg_replace("/#([0-9a-fA-F]{1})\\1([0-9a-fA-F]{1})\\2([0-9a-fA-F]{1})\\3/", "#\\1\\2\\3",$css);
341
342    return $css;
343}
344
345/**
346 * Callback for css_compress()
347 *
348 * Keeps short comments (< 5 chars) to maintain typical browser hacks
349 *
350 * @author Andreas Gohr <andi@splitbrain.org>
351 */
352function css_comment_cb($matches){
353    if(strlen($matches[2]) > 4) return '';
354    return $matches[0];
355}
356
357//Setup VIM: ex: et ts=4 :
358