xref: /dokuwiki/lib/exe/css.php (revision 6d8e3ea1634ecdd794e663fa1f7c802f2fd8914f) 
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    $tplinc = tpl_incdir($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/'.$mediatype.'.css'] = DOKU_BASE.'lib/styles/';
73
74        // load jQuery-UI theme
75        if ($mediatype == 'screen') {
76            $files[$mediatype][DOKU_INC.'lib/scripts/jquery/jquery-ui-theme/smoothness.css'] = DOKU_BASE.'lib/scripts/jquery/jquery-ui-theme/';
77        }
78        // load plugin styles
79        $files[$mediatype] = array_merge($files[$mediatype], css_pluginstyles($mediatype));
80        // load template styles
81        if (isset($styleini['stylesheets'][$mediatype])) {
82            $files[$mediatype] = array_merge($files[$mediatype], $styleini['stylesheets'][$mediatype]);
83        }
84        // load user styles
85        if(isset($config_cascade['userstyle'][$mediatype])){
86            $files[$mediatype][$config_cascade['userstyle'][$mediatype]] = DOKU_BASE;
87        }
88
89        $cache_files = array_merge($cache_files, array_keys($files[$mediatype]));
90    }
91
92    // check cache age & handle conditional request
93    // This may exit if a cache can be used
94    http_cached($cache->cache,
95                $cache->useCache(array('files' => $cache_files)));
96
97    // start output buffering
98    ob_start();
99
100    // build the stylesheet
101    foreach ($mediatypes as $mediatype) {
102
103        // print the default classes for interwiki links and file downloads
104        if ($mediatype == 'screen') {
105            print '@media screen {';
106            css_interwiki();
107            css_filetypes();
108            print '}';
109        }
110
111        // load files
112        $css_content = '';
113        foreach($files[$mediatype] as $file => $location){
114            $display = str_replace(fullpath(DOKU_INC), '', fullpath($file));
115            $css_content .= "\n/* XXXXXXXXX $display XXXXXXXXX */\n";
116            $css_content .= css_loadfile($file, $location);
117        }
118        switch ($mediatype) {
119            case 'screen':
120                print NL.'@media screen { /* START screen styles */'.NL.$css_content.NL.'} /* /@media END screen styles */'.NL;
121                break;
122            case 'print':
123                print NL.'@media print { /* START print styles */'.NL.$css_content.NL.'} /* /@media END print styles */'.NL;
124                break;
125            case 'all':
126            case 'feed':
127            default:
128                print NL.'/* START rest styles */ '.NL.$css_content.NL.'/* END rest styles */'.NL;
129                break;
130        }
131    }
132    // end output buffering and get contents
133    $css = ob_get_contents();
134    ob_end_clean();
135
136    // strip any source maps
137    stripsourcemaps($css);
138
139    // apply style replacements
140    $css = css_applystyle($css, $styleini['replacements']);
141
142    // parse less
143    $css = css_parseless($css);
144
145    // compress whitespace and comments
146    if($conf['compress']){
147        $css = css_compress($css);
148    }
149
150    // embed small images right into the stylesheet
151    if($conf['cssdatauri']){
152        $base = preg_quote(DOKU_BASE,'#');
153        $css = preg_replace_callback('#(url\([ \'"]*)('.$base.')(.*?(?:\.(png|gif)))#i','css_datauri',$css);
154    }
155
156    http_cached_finish($cache->cache, $css);
157}
158
159/**
160 * Uses phpless to parse LESS in our CSS
161 *
162 * most of this function is error handling to show a nice useful error when
163 * LESS compilation fails
164 *
165 * @param $css
166 * @return string
167 */
168function css_parseless($css) {
169    $less = new lessc();
170    $less->importDir[] = DOKU_INC;
171
172    if (defined('DOKU_UNITTEST')){
173        $less->importDir[] = TMP_DIR;
174    }
175
176    try {
177        return $less->compile($css);
178    } catch(Exception $e) {
179        // get exception message
180        $msg = str_replace(array("\n", "\r", "'"), array(), $e->getMessage());
181
182        // try to use line number to find affected file
183        if(preg_match('/line: (\d+)$/', $msg, $m)){
184            $msg = substr($msg, 0, -1* strlen($m[0])); //remove useless linenumber
185            $lno = $m[1];
186
187            // walk upwards to last include
188            $lines = explode("\n", $css);
189            for($i=$lno-1; $i>=0; $i--){
190                if(preg_match('/\/(\* XXXXXXXXX )(.*?)( XXXXXXXXX \*)\//', $lines[$i], $m)){
191                    // we found it, add info to message
192                    $msg .= ' in '.$m[2].' at line '.($lno-$i);
193                    break;
194                }
195            }
196        }
197
198        // something went wrong
199        $error = 'A fatal error occured during compilation of the CSS files. '.
200            'If you recently installed a new plugin or template it '.
201            'might be broken and you should try disabling it again. ['.$msg.']';
202
203        echo ".dokuwiki:before {
204            content: '$error';
205            background-color: red;
206            display: block;
207            background-color: #fcc;
208            border-color: #ebb;
209            color: #000;
210            padding: 0.5em;
211        }";
212
213        exit;
214    }
215}
216
217/**
218 * Does placeholder replacements in the style according to
219 * the ones defined in a templates style.ini file
220 *
221 * This also adds the ini defined placeholders as less variables
222 * (sans the surrounding __ and with a ini_ prefix)
223 *
224 * @author Andreas Gohr <andi@splitbrain.org>
225 */
226function css_applystyle($css, $replacements) {
227    // we convert ini replacements to LESS variable names
228    // and build a list of variable: value; pairs
229    $less = '';
230    foreach((array) $replacements as $key => $value) {
231        $lkey = trim($key, '_');
232        $lkey = '@ini_'.$lkey;
233        $less .= "$lkey: $value;\n";
234
235        $replacements[$key] = $lkey;
236    }
237
238    // we now replace all old ini replacements with LESS variables
239    $css = strtr($css, $replacements);
240
241    // now prepend the list of LESS variables as the very first thing
242    $css = $less.$css;
243    return $css;
244}
245
246/**
247 * Load style ini contents
248 *
249 * Loads and merges style.ini files from template and config and prepares
250 * the stylesheet modes
251 *
252 * @author Andreas Gohr <andi@splitbrain.org>
253 * @param string $tpl the used template
254 * @return array with keys 'stylesheets' and 'replacements'
255 */
256function css_styleini($tpl) {
257    $stylesheets = array(); // mode, file => base
258    $replacements = array(); // placeholder => value
259
260    // load template's style.ini
261    $incbase = tpl_incdir($tpl);
262    $webbase = tpl_basedir($tpl);
263    $ini = $incbase.'style.ini';
264    if(file_exists($ini)){
265        $data = parse_ini_file($ini, true);
266
267        // stylesheets
268        if(is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
269            $stylesheets[$mode][$incbase.$file] = $webbase;
270        }
271
272        // replacements
273        if(is_array($data['replacements'])){
274            $replacements = array_merge($replacements, css_fixreplacementurls($data['replacements'],$webbase));
275        }
276    }
277
278    // load template's style.local.ini
279    // @deprecated 2013-08-03
280    $ini = $incbase.'style.local.ini';
281    if(file_exists($ini)){
282        $data = parse_ini_file($ini, true);
283
284        // stylesheets
285        if(is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
286            $stylesheets[$mode][$incbase.$file] = $webbase;
287        }
288
289        // replacements
290        if(is_array($data['replacements'])){
291            $replacements = array_merge($replacements, css_fixreplacementurls($data['replacements'],$webbase));
292        }
293    }
294
295    // load configs's style.ini
296    $webbase = DOKU_BASE;
297    $ini = DOKU_CONF."tpl/$tpl/style.ini";
298    $incbase = dirname($ini).'/';
299    if(file_exists($ini)){
300        $data = parse_ini_file($ini, true);
301
302        // stylesheets
303        if(is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
304            $stylesheets[$mode][$incbase.$file] = $webbase;
305        }
306
307        // replacements
308        if(is_array($data['replacements'])){
309            $replacements = array_merge($replacements, css_fixreplacementurls($data['replacements'],$webbase));
310        }
311    }
312
313    return array(
314        'stylesheets' => $stylesheets,
315        'replacements' => $replacements
316    );
317}
318
319/**
320 * Amend paths used in replacement relative urls, refer FS#2879
321 *
322 * @author Chris Smith <chris@jalakai.co.uk>
323 */
324function css_fixreplacementurls($replacements, $location) {
325    foreach($replacements as $key => $value) {
326        $replacements[$key] = preg_replace('#(url\([ \'"]*)(?!/|data:|http://|https://| |\'|")#','\\1'.$location,$value);
327    }
328    return $replacements;
329}
330
331/**
332 * Prints classes for interwikilinks
333 *
334 * Interwiki links have two classes: 'interwiki' and 'iw_$name>' where
335 * $name is the identifier given in the config. All Interwiki links get
336 * an default style with a default icon. If a special icon is available
337 * for an interwiki URL it is set in it's own class. Both classes can be
338 * overwritten in the template or userstyles.
339 *
340 * @author Andreas Gohr <andi@splitbrain.org>
341 */
342function css_interwiki(){
343
344    // default style
345    echo 'a.interwiki {';
346    echo ' background: transparent url('.DOKU_BASE.'lib/images/interwiki.png) 0px 1px no-repeat;';
347    echo ' padding: 1px 0px 1px 16px;';
348    echo '}';
349
350    // additional styles when icon available
351    $iwlinks = getInterwiki();
352    foreach(array_keys($iwlinks) as $iw){
353        $class = preg_replace('/[^_\-a-z0-9]+/i','_',$iw);
354        if(@file_exists(DOKU_INC.'lib/images/interwiki/'.$iw.'.png')){
355            echo "a.iw_$class {";
356            echo '  background-image: url('.DOKU_BASE.'lib/images/interwiki/'.$iw.'.png)';
357            echo '}';
358        }elseif(@file_exists(DOKU_INC.'lib/images/interwiki/'.$iw.'.gif')){
359            echo "a.iw_$class {";
360            echo '  background-image: url('.DOKU_BASE.'lib/images/interwiki/'.$iw.'.gif)';
361            echo '}';
362        }
363    }
364}
365
366/**
367 * Prints classes for file download links
368 *
369 * @author Andreas Gohr <andi@splitbrain.org>
370 */
371function css_filetypes(){
372
373    // default style
374    echo '.mediafile {';
375    echo ' background: transparent url('.DOKU_BASE.'lib/images/fileicons/file.png) 0px 1px no-repeat;';
376    echo ' padding-left: 18px;';
377    echo ' padding-bottom: 1px;';
378    echo '}';
379
380    // additional styles when icon available
381    // scan directory for all icons
382    $exts = array();
383    if($dh = opendir(DOKU_INC.'lib/images/fileicons')){
384        while(false !== ($file = readdir($dh))){
385            if(preg_match('/([_\-a-z0-9]+(?:\.[_\-a-z0-9]+)*?)\.(png|gif)/i',$file,$match)){
386                $ext = strtolower($match[1]);
387                $type = '.'.strtolower($match[2]);
388                if($ext!='file' && (!isset($exts[$ext]) || $type=='.png')){
389                    $exts[$ext] = $type;
390                }
391            }
392        }
393        closedir($dh);
394    }
395    foreach($exts as $ext=>$type){
396        $class = preg_replace('/[^_\-a-z0-9]+/','_',$ext);
397        echo ".mf_$class {";
398        echo '  background-image: url('.DOKU_BASE.'lib/images/fileicons/'.$ext.$type.')';
399        echo '}';
400    }
401}
402
403/**
404 * Loads a given file and fixes relative URLs with the
405 * given location prefix
406 */
407function css_loadfile($file,$location=''){
408    $css_file = new DokuCssFile($file);
409    return $css_file->load($location);
410}
411
412/**
413 *  Helper class to abstract loading of css/less files
414 *
415 *  @author Chris Smith <chris@jalakai.co.uk>
416 */
417class DokuCssFile {
418
419    protected $filepath;             // file system path to the CSS/Less file
420    protected $location;             // base url location of the CSS/Less file
421    private   $relative_path = null;
422
423    public function __construct($file) {
424        $this->filepath = $file;
425    }
426
427    /**
428     * Load the contents of the css/less file and adjust any relative paths/urls (relative to this file) to be
429     * relative to the dokuwiki root: the web root (DOKU_BASE) for most files; the file system root (DOKU_INC)
430     * for less files.
431     *
432     * @param   string   $location   base url for this file
433     * @return  string               the CSS/Less contents of the file
434     */
435    public function load($location='') {
436        if (!@file_exists($this->filepath)) return '';
437
438        $css = io_readFile($this->filepath);
439        if (!$location) return $css;
440
441        $this->location = $location;
442
443        $css = preg_replace_callback('#(url\( *)([\'"]?)(.*?)(\2)( *\))#',array($this,'replacements'),$css);
444        $css = preg_replace_callback('#(@import\s+)([\'"])(.*?)(\2)#',array($this,'replacements'),$css);
445
446        return $css;
447    }
448
449    /**
450     * Get the relative file system path of this file, relative to dokuwiki's root folder, DOKU_INC
451     *
452     * @return string   relative file system path
453     */
454    private function getRelativePath(){
455
456        if (is_null($this->relative_path)) {
457            $basedir = array(DOKU_INC);
458
459            // during testing, files may be found relative to a second base dir, TMP_DIR
460            if (defined('DOKU_UNITTEST')) {
461                $basedir[] = realpath(TMP_DIR);
462            }
463
464            $basedir = array_map('preg_quote_cb', $basedir);
465            $regex = '/^('.join('|',$basedir).')/';
466            $this->relative_path = preg_replace($regex, '', dirname($this->filepath));
467        }
468
469        return $this->relative_path;
470    }
471
472    /**
473     * preg_replace callback to adjust relative urls from relative to this file to relative
474     * to the appropriate dokuwiki root location as described in the code
475     *
476     * @param  array    see http://php.net/preg_replace_callback
477     * @return string   see http://php.net/preg_replace_callback
478     */
479    public function replacements($match) {
480
481        // not a relative url? - no adjustment required
482        if (preg_match('#^(/|data:|https?://)#',$match[3])) {
483            return $match[0];
484        }
485        // a less file import? - requires a file system location
486        else if (substr($match[3],-5) == '.less') {
487            if ($match[3]{0} != '/') {
488                $match[3] = $this->getRelativePath() . '/' . $match[3];
489            }
490        }
491        // everything else requires a url adjustment
492        else {
493            $match[3] = $this->location . $match[3];
494        }
495
496        return join('',array_slice($match,1));
497    }
498}
499
500/**
501 * Convert local image URLs to data URLs if the filesize is small
502 *
503 * Callback for preg_replace_callback
504 */
505function css_datauri($match){
506    global $conf;
507
508    $pre   = unslash($match[1]);
509    $base  = unslash($match[2]);
510    $url   = unslash($match[3]);
511    $ext   = unslash($match[4]);
512
513    $local = DOKU_INC.$url;
514    $size  = @filesize($local);
515    if($size && $size < $conf['cssdatauri']){
516        $data = base64_encode(file_get_contents($local));
517    }
518    if($data){
519        $url = 'data:image/'.$ext.';base64,'.$data;
520    }else{
521        $url = $base.$url;
522    }
523    return $pre.$url;
524}
525
526
527/**
528 * Returns a list of possible Plugin Styles (no existance check here)
529 *
530 * @author Andreas Gohr <andi@splitbrain.org>
531 */
532function css_pluginstyles($mediatype='screen'){
533    global $lang;
534    $list = array();
535    $plugins = plugin_list();
536    foreach ($plugins as $p){
537        $list[DOKU_PLUGIN."$p/$mediatype.css"]  = DOKU_BASE."lib/plugins/$p/";
538        $list[DOKU_PLUGIN."$p/$mediatype.less"]  = DOKU_BASE."lib/plugins/$p/";
539        // alternative for screen.css
540        if ($mediatype=='screen') {
541            $list[DOKU_PLUGIN."$p/style.css"]  = DOKU_BASE."lib/plugins/$p/";
542            $list[DOKU_PLUGIN."$p/style.less"]  = DOKU_BASE."lib/plugins/$p/";
543        }
544    }
545    return $list;
546}
547
548/**
549 * Very simple CSS optimizer
550 *
551 * @author Andreas Gohr <andi@splitbrain.org>
552 */
553function css_compress($css){
554    //strip comments through a callback
555    $css = preg_replace_callback('#(/\*)(.*?)(\*/)#s','css_comment_cb',$css);
556
557    //strip (incorrect but common) one line comments
558    $css = preg_replace_callback('/^.*\/\/.*$/m','css_onelinecomment_cb',$css);
559
560    // strip whitespaces
561    $css = preg_replace('![\r\n\t ]+!',' ',$css);
562    $css = preg_replace('/ ?([;,{}\/]) ?/','\\1',$css);
563    $css = preg_replace('/ ?: /',':',$css);
564
565    // number compression
566    $css = preg_replace('/([: ])0+(\.\d+?)0*((?:pt|pc|in|mm|cm|em|ex|px)\b|%)(?=[^\{]*[;\}])/', '$1$2$3', $css); // "0.1em" to ".1em", "1.10em" to "1.1em"
567    $css = preg_replace('/([: ])\.(0)+((?:pt|pc|in|mm|cm|em|ex|px)\b|%)(?=[^\{]*[;\}])/', '$1$2', $css); // ".0em" to "0"
568    $css = preg_replace('/([: ]0)0*(\.0*)?((?:pt|pc|in|mm|cm|em|ex|px)(?=[^\{]*[;\}])\b|%)/', '$1', $css); // "0.0em" to "0"
569    $css = preg_replace('/([: ]\d+)(\.0*)((?:pt|pc|in|mm|cm|em|ex|px)(?=[^\{]*[;\}])\b|%)/', '$1$3', $css); // "1.0em" to "1em"
570    $css = preg_replace('/([: ])0+(\d+|\d*\.\d+)((?:pt|pc|in|mm|cm|em|ex|px)(?=[^\{]*[;\}])\b|%)/', '$1$2$3', $css); // "001em" to "1em"
571
572    // shorten attributes (1em 1em 1em 1em -> 1em)
573    $css = preg_replace('/(?<![\w\-])((?:margin|padding|border|border-(?:width|radius)):)([\w\.]+)( \2)+(?=[;\}]| !)/', '$1$2', $css); // "1em 1em 1em 1em" to "1em"
574    $css = preg_replace('/(?<![\w\-])((?:margin|padding|border|border-(?:width)):)([\w\.]+) ([\w\.]+) \2 \3(?=[;\}]| !)/', '$1$2 $3', $css); // "1em 2em 1em 2em" to "1em 2em"
575
576    // shorten colors
577    $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);
578
579    return $css;
580}
581
582/**
583 * Callback for css_compress()
584 *
585 * Keeps short comments (< 5 chars) to maintain typical browser hacks
586 *
587 * @author Andreas Gohr <andi@splitbrain.org>
588 */
589function css_comment_cb($matches){
590    if(strlen($matches[2]) > 4) return '';
591    return $matches[0];
592}
593
594/**
595 * Callback for css_compress()
596 *
597 * Strips one line comments but makes sure it will not destroy url() constructs with slashes
598 *
599 * @param $matches
600 * @return string
601 */
602function css_onelinecomment_cb($matches) {
603    $line = $matches[0];
604
605    $i = 0;
606    $len = strlen($line);
607
608    while ($i< $len){
609        $nextcom = strpos($line, '//', $i);
610        $nexturl = stripos($line, 'url(', $i);
611
612        if($nextcom === false) {
613            // no more comments, we're done
614            $i = $len;
615            break;
616        }
617
618        // keep any quoted string that starts before a comment
619        $nextsqt = strpos($line, "'", $i);
620        $nextdqt = strpos($line, '"', $i);
621        if(min($nextsqt, $nextdqt) < $nextcom) {
622            $skipto = false;
623            if($nextsqt !== false && ($nextdqt === false || $nextsqt < $nextdqt)) {
624                $skipto = strpos($line, "'", $nextsqt+1) +1;
625            } else if ($nextdqt !== false) {
626                $skipto = strpos($line, '"', $nextdqt+1) +1;
627            }
628
629            if($skipto !== false) {
630                $i = $skipto;
631                continue;
632            }
633        }
634
635        if($nexturl === false || $nextcom < $nexturl) {
636            // no url anymore, strip comment and be done
637            $i = $nextcom;
638            break;
639        }
640
641        // we have an upcoming url
642        $i = strpos($line, ')', $nexturl);
643    }
644
645    return substr($line, 0, $i);
646}
647
648//Setup VIM: ex: et ts=4 :
649