xref: /dokuwiki/lib/exe/css.php (revision 5d92c7d222f614c23229a455bc6738bbaaf0a6ce) 
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
12if(!defined('NL')) define('NL',"\n");
13require_once(DOKU_INC.'inc/init.php');
14
15// Main (don't run when UNIT test)
16if(!defined('SIMPLE_TEST')){
17    header('Content-Type: text/css; charset=utf-8');
18    css_out();
19}
20
21
22// ---------------------- functions ------------------------------
23
24/**
25 * Output all needed Styles
26 *
27 * @author Andreas Gohr <andi@splitbrain.org>
28 */
29function css_out(){
30    global $conf;
31    global $lang;
32    global $config_cascade;
33    global $INPUT;
34
35    if ($INPUT->str('s') == 'feed') {
36        $mediatypes = array('feed');
37        $type = 'feed';
38    } else {
39        $mediatypes = array('screen', 'all', 'print');
40        $type = '';
41    }
42
43    // decide from where to get the template
44    $tpl = trim(preg_replace('/[^\w-]+/','',$INPUT->str('t')));
45    if(!$tpl) $tpl = $conf['template'];
46
47    // The generated script depends on some dynamic options
48    $cache = new cache('styles'.$_SERVER['HTTP_HOST'].$_SERVER['SERVER_PORT'].DOKU_BASE.$tpl.$type,'.css');
49
50    // load styl.ini
51    $styleini = css_styleini($tpl);
52
53    // if old 'default' userstyle setting exists, make it 'screen' userstyle for backwards compatibility
54    if (isset($config_cascade['userstyle']['default'])) {
55        $config_cascade['userstyle']['screen'] = $config_cascade['userstyle']['default'];
56    }
57
58    // cache influencers
59    $tplinc = tpl_basedir($tpl);
60    $cache_files = getConfigFiles('main');
61    $cache_files[] = $tplinc.'style.ini';
62    $cache_files[] = $tplinc.'style.local.ini'; // @deprecated
63    $cache_files[] = DOKU_CONF."tpl/$tpl/style.ini";
64    $cache_files[] = __FILE__;
65
66    // Array of needed files and their web locations, the latter ones
67    // are needed to fix relative paths in the stylesheets
68    $files = array();
69    foreach($mediatypes as $mediatype) {
70        $files[$mediatype] = array();
71        // load core styles
72        $files[$mediatype][DOKU_INC.'lib/styles/'.$mediatype.'.css'] = DOKU_BASE.'lib/styles/';
73        // load jQuery-UI theme
74        if ($mediatype == 'screen') {
75            $files[$mediatype][DOKU_INC.'lib/scripts/jquery/jquery-ui-theme/smoothness.css'] = DOKU_BASE.'lib/scripts/jquery/jquery-ui-theme/';
76        }
77        // load plugin styles
78        $files[$mediatype] = array_merge($files[$mediatype], css_pluginstyles($mediatype));
79        // load template styles
80        if (isset($styleini['stylesheets'][$mediatype])) {
81            $files[$mediatype] = array_merge($files[$mediatype], $styleini['stylesheets'][$mediatype]);
82        }
83        // load user styles
84        if(isset($config_cascade['userstyle'][$mediatype])){
85            $files[$mediatype][$config_cascade['userstyle'][$mediatype]] = DOKU_BASE;
86        }
87        // load rtl styles
88        // note: this adds the rtl styles only to the 'screen' media type
89        // @deprecated 2012-04-09: rtl will cease to be a mode of its own,
90        //     please use "[dir=rtl]" in any css file in all, screen or print mode instead
91        if ($mediatype=='screen') {
92            if($lang['direction'] == 'rtl'){
93                if (isset($styleini['stylesheets']['rtl'])) $files[$mediatype] = array_merge($files[$mediatype], $styleini['stylesheets']['rtl']);
94                if (isset($config_cascade['userstyle']['rtl'])) $files[$mediatype][$config_cascade['userstyle']['rtl']] = DOKU_BASE;
95            }
96        }
97
98        $cache_files = array_merge($cache_files, array_keys($files[$mediatype]));
99    }
100
101    // check cache age & handle conditional request
102    // This may exit if a cache can be used
103    http_cached($cache->cache,
104                $cache->useCache(array('files' => $cache_files)));
105
106    // start output buffering
107    ob_start();
108
109    // build the stylesheet
110    foreach ($mediatypes as $mediatype) {
111
112        // print the default classes for interwiki links and file downloads
113        if ($mediatype == 'screen') {
114            print '@media screen {';
115            css_interwiki();
116            css_filetypes();
117            print '}';
118        }
119
120        // load files
121        $css_content = '';
122        foreach($files[$mediatype] as $file => $location){
123            $display = str_replace(fullpath(DOKU_INC), '', fullpath($file));
124            $css_content .= "\n/* XXXXXXXXX $display XXXXXXXXX */\n";
125            $css_content .= css_loadfile($file, $location);
126        }
127        switch ($mediatype) {
128            case 'screen':
129                print NL.'@media screen { /* START screen styles */'.NL.$css_content.NL.'} /* /@media END screen styles */'.NL;
130                break;
131            case 'print':
132                print NL.'@media print { /* START print styles */'.NL.$css_content.NL.'} /* /@media END print styles */'.NL;
133                break;
134            case 'all':
135            case 'feed':
136            default:
137                print NL.'/* START rest styles */ '.NL.$css_content.NL.'/* END rest styles */'.NL;
138                break;
139        }
140    }
141    // end output buffering and get contents
142    $css = ob_get_contents();
143    ob_end_clean();
144
145    // apply style replacements
146    $css = css_applystyle($css, $styleini['replacements']);
147
148    // parse less
149    $css = css_parseless($css);
150
151    // place all remaining @import statements at the top of the file
152    $css = css_moveimports($css);
153
154    // compress whitespace and comments
155    if($conf['compress']){
156        $css = css_compress($css);
157    }
158
159    // embed small images right into the stylesheet
160    if($conf['cssdatauri']){
161        $base = preg_quote(DOKU_BASE,'#');
162        $css = preg_replace_callback('#(url\([ \'"]*)('.$base.')(.*?(?:\.(png|gif)))#i','css_datauri',$css);
163    }
164
165    http_cached_finish($cache->cache, $css);
166}
167
168/**
169 * Uses phpless to parse LESS in our CSS
170 *
171 * most of this function is error handling to show a nice useful error when
172 * LESS compilation fails
173 *
174 * @param $css
175 * @return string
176 */
177function css_parseless($css) {
178    $less = new lessc();
179    try {
180        return $less->compile($css);
181    } catch(Exception $e) {
182        // get exception message
183        $msg = str_replace(array("\n", "\r", "'"), array(), $e->getMessage());
184
185        // try to use line number to find affected file
186        if(preg_match('/line: (\d+)$/', $msg, $m)){
187            $msg = substr($msg, 0, -1* strlen($m[0])); //remove useless linenumber
188            $lno = $m[1];
189
190            // walk upwards to last include
191            $lines = explode("\n", $css);
192            for($i=$lno-1; $i>=0; $i--){
193                if(preg_match('/\/(\* XXXXXXXXX )(.*?)( XXXXXXXXX \*)\//', $lines[$i], $m)){
194                    // we found it, add info to message
195                    $msg .= ' in '.$m[2].' at line '.($lno-$i);
196                    break;
197                }
198            }
199        }
200
201        // something went wrong
202        $error = 'A fatal error occured during compilation of the CSS files. '.
203            'If you recently installed a new plugin or template it '.
204            'might be broken and you should try disabling it again. ['.$msg.']';
205
206        echo ".dokuwiki:before {
207            content: '$error';
208            background-color: red;
209            display: block;
210            background-color: #fcc;
211            border-color: #ebb;
212            color: #000;
213            padding: 0.5em;
214        }";
215
216        exit;
217    }
218}
219
220/**
221 * Does placeholder replacements in the style according to
222 * the ones defined in a templates style.ini file
223 *
224 * This also adds the ini defined placeholders as less variables
225 * (sans the surrounding __ and with a ini_ prefix)
226 *
227 * @author Andreas Gohr <andi@splitbrain.org>
228 */
229function css_applystyle($css, $replacements) {
230    // we convert ini replacements to LESS variable names
231    // and build a list of variable: value; pairs
232    $less = '';
233    foreach((array) $replacements as $key => $value) {
234        $lkey = trim($key, '_');
235        $lkey = '@ini_'.$lkey;
236        $less .= "$lkey: $value;\n";
237
238        $replacements[$key] = $lkey;
239    }
240
241    // we now replace all old ini replacements with LESS variables
242    $css = strtr($css, $replacements);
243
244    // now prepend the list of LESS variables as the very first thing
245    $css = $less.$css;
246    return $css;
247}
248
249/**
250 * Load style ini contents
251 *
252 * Loads and merges style.ini files from template and config and prepares
253 * the stylesheet modes
254 *
255 * @author Andreas Gohr <andi@splitbrain.org>
256 * @param string $tpl the used template
257 * @return array with keys 'stylesheets' and 'replacements'
258 */
259function css_styleini($tpl) {
260    $stylesheets = array(); // mode, file => base
261    $replacements = array(); // placeholder => value
262
263    // load template's style.ini
264    $incbase = tpl_incdir($tpl);
265    $webbase = tpl_basedir($tpl);
266    $ini = $incbase.'style.ini';
267    if(file_exists($ini)){
268        $data = parse_ini_file($ini, true);
269
270        // stylesheets
271        if(is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
272            $stylesheets[$mode][$incbase.$file] = $webbase;
273        }
274
275        // replacements
276        if(is_array($data['replacements'])){
277            $replacements = array_merge($replacements, $data['replacements']);
278        }
279    }
280
281    // load template's style.local.ini
282    // @deprecated 2013-08-03
283    $ini = $incbase.'style.local.ini';
284    if(file_exists($ini)){
285        $data = parse_ini_file($ini, true);
286
287        // stylesheets
288        if(is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
289            $stylesheets[$mode][$incbase.$file] = $webbase;
290        }
291
292        // replacements
293        if(is_array($data['replacements'])){
294            $replacements = array_merge($replacements, $data['replacements']);
295        }
296    }
297
298    // load configs's style.ini
299    $webbase = DOKU_BASE;
300    $ini = DOKU_CONF."tpl/$tpl/style.ini";
301    $incbase = dirname($ini).'/';
302    if(file_exists($ini)){
303        $data = parse_ini_file($ini, true);
304
305        // stylesheets
306        if(is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
307            $stylesheets[$mode][$incbase.$file] = $webbase;
308        }
309
310        // replacements
311        if(is_array($data['replacements'])){
312            $replacements = array_merge($replacements, $data['replacements']);
313        }
314    }
315
316    return array(
317        'stylesheets' => $stylesheets,
318        'replacements' => $replacements
319    );
320}
321
322/**
323 * Prints classes for interwikilinks
324 *
325 * Interwiki links have two classes: 'interwiki' and 'iw_$name>' where
326 * $name is the identifier given in the config. All Interwiki links get
327 * an default style with a default icon. If a special icon is available
328 * for an interwiki URL it is set in it's own class. Both classes can be
329 * overwritten in the template or userstyles.
330 *
331 * @author Andreas Gohr <andi@splitbrain.org>
332 */
333function css_interwiki(){
334
335    // default style
336    echo 'a.interwiki {';
337    echo ' background: transparent url('.DOKU_BASE.'lib/images/interwiki.png) 0px 1px no-repeat;';
338    echo ' padding: 1px 0px 1px 16px;';
339    echo '}';
340
341    // additional styles when icon available
342    $iwlinks = getInterwiki();
343    foreach(array_keys($iwlinks) as $iw){
344        $class = preg_replace('/[^_\-a-z0-9]+/i','_',$iw);
345        if(@file_exists(DOKU_INC.'lib/images/interwiki/'.$iw.'.png')){
346            echo "a.iw_$class {";
347            echo '  background-image: url('.DOKU_BASE.'lib/images/interwiki/'.$iw.'.png)';
348            echo '}';
349        }elseif(@file_exists(DOKU_INC.'lib/images/interwiki/'.$iw.'.gif')){
350            echo "a.iw_$class {";
351            echo '  background-image: url('.DOKU_BASE.'lib/images/interwiki/'.$iw.'.gif)';
352            echo '}';
353        }
354    }
355}
356
357/**
358 * Prints classes for file download links
359 *
360 * @author Andreas Gohr <andi@splitbrain.org>
361 */
362function css_filetypes(){
363
364    // default style
365    echo '.mediafile {';
366    echo ' background: transparent url('.DOKU_BASE.'lib/images/fileicons/file.png) 0px 1px no-repeat;';
367    echo ' padding-left: 18px;';
368    echo ' padding-bottom: 1px;';
369    echo '}';
370
371    // additional styles when icon available
372    // scan directory for all icons
373    $exts = array();
374    if($dh = opendir(DOKU_INC.'lib/images/fileicons')){
375        while(false !== ($file = readdir($dh))){
376            if(preg_match('/([_\-a-z0-9]+(?:\.[_\-a-z0-9]+)*?)\.(png|gif)/i',$file,$match)){
377                $ext = strtolower($match[1]);
378                $type = '.'.strtolower($match[2]);
379                if($ext!='file' && (!isset($exts[$ext]) || $type=='.png')){
380                    $exts[$ext] = $type;
381                }
382            }
383        }
384        closedir($dh);
385    }
386    foreach($exts as $ext=>$type){
387        $class = preg_replace('/[^_\-a-z0-9]+/','_',$ext);
388        echo ".mf_$class {";
389        echo '  background-image: url('.DOKU_BASE.'lib/images/fileicons/'.$ext.$type.')';
390        echo '}';
391    }
392}
393
394/**
395 * Loads a given file and fixes relative URLs with the
396 * given location prefix
397 */
398function css_loadfile($file,$location=''){
399    if(!@file_exists($file)) return '';
400    $css = io_readFile($file);
401    if(!$location) return $css;
402
403    $css = preg_replace('#(url\([ \'"]*)(?!/|data:|http://|https://| |\'|")#','\\1'.$location,$css);
404    $css = preg_replace('#(@import\s+[\'"])(?!/|data:|http://|https://)#', '\\1'.$location, $css);
405
406    return $css;
407}
408
409/**
410 * Converte local image URLs to data URLs if the filesize is small
411 *
412 * Callback for preg_replace_callback
413 */
414function css_datauri($match){
415    global $conf;
416
417    $pre   = unslash($match[1]);
418    $base  = unslash($match[2]);
419    $url   = unslash($match[3]);
420    $ext   = unslash($match[4]);
421
422    $local = DOKU_INC.$url;
423    $size  = @filesize($local);
424    if($size && $size < $conf['cssdatauri']){
425        $data = base64_encode(file_get_contents($local));
426    }
427    if($data){
428        $url = '\'data:image/'.$ext.';base64,'.$data.'\'';
429    }else{
430        $url = $base.$url;
431    }
432    return $pre.$url;
433}
434
435
436/**
437 * Returns a list of possible Plugin Styles (no existance check here)
438 *
439 * @author Andreas Gohr <andi@splitbrain.org>
440 */
441function css_pluginstyles($mediatype='screen'){
442    global $lang;
443    $list = array();
444    $plugins = plugin_list();
445    foreach ($plugins as $p){
446        $list[DOKU_PLUGIN."$p/$mediatype.css"]  = DOKU_BASE."lib/plugins/$p/";
447        $list[DOKU_PLUGIN."$p/$mediatype.less"]  = DOKU_BASE."lib/plugins/$p/";
448        // alternative for screen.css
449        if ($mediatype=='screen') {
450            $list[DOKU_PLUGIN."$p/style.css"]  = DOKU_BASE."lib/plugins/$p/";
451            $list[DOKU_PLUGIN."$p/style.less"]  = DOKU_BASE."lib/plugins/$p/";
452        }
453        // @deprecated 2012-04-09: rtl will cease to be a mode of its own,
454        //     please use "[dir=rtl]" in any css file in all, screen or print mode instead
455        if($lang['direction'] == 'rtl'){
456            $list[DOKU_PLUGIN."$p/rtl.css"] = DOKU_BASE."lib/plugins/$p/";
457        }
458    }
459    return $list;
460}
461
462/**
463 * Move all @import statements in a combined stylesheet to the top so they
464 * aren't ignored by the browser.
465 *
466 * @author Gabriel Birke <birke@d-scribe.de>
467 */
468function css_moveimports($css)
469{
470    if(!preg_match_all('/@import\s+(?:url\([^)]+\)|"[^"]+")\s*[^;]*;\s*/', $css, $matches, PREG_OFFSET_CAPTURE)) {
471        return $css;
472    }
473    $newCss  = "";
474    $imports = "";
475    $offset  = 0;
476    foreach($matches[0] as $match) {
477        $newCss  .= substr($css, $offset, $match[1] - $offset);
478        $imports .= $match[0];
479        $offset   = $match[1] + strlen($match[0]);
480    }
481    $newCss .= substr($css, $offset);
482    return $imports.$newCss;
483}
484
485/**
486 * Very simple CSS optimizer
487 *
488 * @author Andreas Gohr <andi@splitbrain.org>
489 */
490function css_compress($css){
491    //strip comments through a callback
492    $css = preg_replace_callback('#(/\*)(.*?)(\*/)#s','css_comment_cb',$css);
493
494    //strip (incorrect but common) one line comments
495    $css = preg_replace('/(?<!:)\/\/.*$/m','',$css);
496
497    // strip whitespaces
498    $css = preg_replace('![\r\n\t ]+!',' ',$css);
499    $css = preg_replace('/ ?([;,{}\/]) ?/','\\1',$css);
500    $css = preg_replace('/ ?: /',':',$css);
501
502    // shorten colors
503    $css = preg_replace("/#([0-9a-fA-F]{1})\\1([0-9a-fA-F]{1})\\2([0-9a-fA-F]{1})\\3/", "#\\1\\2\\3",$css);
504
505    return $css;
506}
507
508/**
509 * Callback for css_compress()
510 *
511 * Keeps short comments (< 5 chars) to maintain typical browser hacks
512 *
513 * @author Andreas Gohr <andi@splitbrain.org>
514 */
515function css_comment_cb($matches){
516    if(strlen($matches[2]) > 4) return '';
517    return $matches[0];
518}
519
520//Setup VIM: ex: et ts=4 :
521