xref: /dokuwiki/lib/exe/css.php (revision ef36714b78f2a947428d002dfcf4696c73bd0a5d) 
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");
13if(!defined('DEFAULT_FLAVOUR')) define('DEFAULT_FLAVOUR',"style");
14require_once(DOKU_INC.'inc/init.php');
15
16// Main (don't run when UNIT test)
17if(!defined('SIMPLE_TEST')){
18    header('Content-Type: text/css; charset=utf-8');
19    css_out();
20}
21
22
23// ---------------------- functions ------------------------------
24
25/**
26 * Output all needed Styles
27 *
28 * @author Andreas Gohr <andi@splitbrain.org>
29 */
30function css_out(){
31    global $conf;
32    global $lang;
33    global $config_cascade;
34    global $INPUT;
35
36    if ($INPUT->str('s') == 'feed') {
37        $mediatypes = array('feed');
38    } else {
39        $mediatypes = array('screen', 'all', 'print', 'handheld');
40    }
41
42    // decide from where to get the template
43    $tpl = trim(preg_replace('/[^\w-]+/','',$INPUT->str('t')));
44    if(!$tpl) $tpl = $conf['template'];
45
46    // decide from where to get the template
47    $flavour = trim(preg_replace('/[^\w-]+/','',$INPUT->str('f')));
48    if(!$flavour) $flavour = DEFAULT_FLAVOUR;
49
50    // load styl.ini
51    $styleini = css_styleini($tpl, $flavour, $INPUT->bool('preview'));
52
53    // cache influencers
54    $tplinc = tpl_incdir($tpl);
55    $cache_files = getConfigFiles('main');
56    $cache_files[] = $tplinc.'style.ini';
57    $cache_files[] = DOKU_CONF."tpl/$tpl/style.ini";
58    $cache_files[] = DOKU_CONF."tpl/$tpl/ini/".$flavour.".ini";
59    $cache_files[] = __FILE__;
60    if($INPUT->bool('preview')) $cache_files[] = $conf['cachedir'].'/preview.ini';
61
62    // Array of needed files and their web locations, the latter ones
63    // are needed to fix relative paths in the stylesheets
64    // We only need to build the list for the requested flavour.
65    $media_files = array();
66    foreach($mediatypes as $mediatype) {
67        $files = array();
68        if ( $flavour === DEFAULT_FLAVOUR ) {
69            // load core styles
70            $files[DOKU_INC.'lib/styles/'.$mediatype.'.css'] = DOKU_BASE.'lib/styles/';
71
72            // load jQuery-UI theme
73            if ($mediatype == 'screen') {
74                $files[DOKU_INC.'lib/scripts/jquery/jquery-ui-theme/smoothness.css'] = DOKU_BASE.'lib/scripts/jquery/jquery-ui-theme/';
75            }
76            // load plugin styles
77            $files = array_merge($files, css_pluginstyles($mediatype));
78            // load template styles
79            if (isset($styleini['stylesheets'][$mediatype])) {
80                $files = array_merge($files, $styleini['stylesheets'][$mediatype]);
81            }
82            // load user styles
83            if(!empty($config_cascade['userstyle'][$mediatype])) {
84                foreach($config_cascade['userstyle'][$mediatype] as $userstyle) {
85                    $files[$userstyle] = DOKU_BASE;
86                }
87            }
88        } else if (isset($styleini['stylesheets'][$mediatype])) {
89            // only allow the predefined media types
90            $files = $styleini['stylesheets'][$mediatype];
91        }
92
93        // Let plugins decide to either put more styles here or to remove some
94        $media_files[$mediatype] = css_filewrapper($mediatype, $flavour, $files);
95    	$CSSEvt = new Doku_Event('CSS_STYLES_INCLUDED', $media_files[$mediatype]);
96
97        // Make it preventable.
98    	if ( $CSSEvt->advise_before() ) {
99            $cache_files = array_merge($cache_files, array_keys($media_files[$mediatype]['files']));
100    	} else {
101        	// unset if prevented. Nothing will be printed for this mediatype.
102        	unset($media_files[$mediatype]);
103    	}
104
105    	// finish event.
106    	$CSSEvt->advise_after();
107    }
108
109    // The generated script depends on some dynamic options
110    $cache = new cache('styles'.$_SERVER['HTTP_HOST'].$_SERVER['SERVER_PORT'].DOKU_BASE.$tpl.md5(serialize($cache_files)),'.css');
111    $cache->_event = 'CSS_CACHE_USE';
112
113    // check cache age & handle conditional request
114    // This may exit if a cache can be used
115    $cache_ok = $cache->useCache(array('files' => $cache_files));
116    http_cached($cache->cache, $cache_ok);
117
118    // start output buffering
119    ob_start();
120
121    if ( $flavour === DEFAULT_FLAVOUR ) {
122        // Fire CSS_STYLES_INCLUDED for one last time to let the
123        // plugins decide whether to include the DW default styles.
124        // This can be done by preventing the Default.
125        $media_files['DW_DEFAULT'] = css_filewrapper('DW_DEFAULT');
126        trigger_event('CSS_STYLES_INCLUDED', $media_files['DW_DEFAULT'], 'css_defaultstyles');
127    }
128
129    // build the stylesheet
130    foreach ($mediatypes as $mediatype) {
131
132        // Check if there is a wrapper set for this type.
133        if ( !isset($media_files[$mediatype]) ) {
134            continue;
135        }
136
137        $cssData = $media_files[$mediatype];
138
139        // Print the styles.
140    	print NL;
141    	if ( $cssData['encapsulate'] === true ) print $cssData['encapsulationPrefix'] . ' {';
142    	print '/* START '.$cssData['mediatype'].' styles */'.NL;
143
144        // load files
145        foreach($cssData['files'] as $file => $location){
146            $display = str_replace(fullpath(DOKU_INC), '', fullpath($file));
147            print "\n/* XXXXXXXXX $display XXXXXXXXX */\n";
148            print css_loadfile($file, $location);
149        }
150
151    	print NL;
152    	if ( $cssData['encapsulate'] === true ) print '} /* /@media ';
153    	else print '/*';
154    	print ' END '.$cssData['mediatype'].' styles */'.NL;
155    }
156
157    // end output buffering and get contents
158    $css = ob_get_contents();
159    ob_end_clean();
160
161    // strip any source maps
162    stripsourcemaps($css);
163
164    // apply style replacements
165    $css = css_applystyle($css, $styleini['replacements']);
166
167    // parse less
168    $css = css_parseless($css);
169
170    // compress whitespace and comments
171    if($conf['compress']){
172        $css = css_compress($css);
173    }
174
175    // embed small images right into the stylesheet
176    if($conf['cssdatauri']){
177        $base = preg_quote(DOKU_BASE,'#');
178        $css = preg_replace_callback('#(url\([ \'"]*)('.$base.')(.*?(?:\.(png|gif)))#i','css_datauri',$css);
179    }
180
181    http_cached_finish($cache->cache, $css);
182}
183
184/**
185 * Uses phpless to parse LESS in our CSS
186 *
187 * most of this function is error handling to show a nice useful error when
188 * LESS compilation fails
189 *
190 * @param string $css
191 * @return string
192 */
193function css_parseless($css) {
194    global $conf;
195
196    $less = new lessc();
197    $less->importDir = array(DOKU_INC);
198    $less->setPreserveComments(!$conf['compress']);
199
200    if (defined('DOKU_UNITTEST')){
201        $less->importDir[] = TMP_DIR;
202    }
203
204    try {
205        return $less->compile($css);
206    } catch(Exception $e) {
207        // get exception message
208        $msg = str_replace(array("\n", "\r", "'"), array(), $e->getMessage());
209
210        // try to use line number to find affected file
211        if(preg_match('/line: (\d+)$/', $msg, $m)){
212            $msg = substr($msg, 0, -1* strlen($m[0])); //remove useless linenumber
213            $lno = $m[1];
214
215            // walk upwards to last include
216            $lines = explode("\n", $css);
217            for($i=$lno-1; $i>=0; $i--){
218                if(preg_match('/\/(\* XXXXXXXXX )(.*?)( XXXXXXXXX \*)\//', $lines[$i], $m)){
219                    // we found it, add info to message
220                    $msg .= ' in '.$m[2].' at line '.($lno-$i);
221                    break;
222                }
223            }
224        }
225
226        // something went wrong
227        $error = 'A fatal error occured during compilation of the CSS files. '.
228            'If you recently installed a new plugin or template it '.
229            'might be broken and you should try disabling it again. ['.$msg.']';
230
231        echo ".dokuwiki:before {
232            content: '$error';
233            background-color: red;
234            display: block;
235            background-color: #fcc;
236            border-color: #ebb;
237            color: #000;
238            padding: 0.5em;
239        }";
240
241        exit;
242    }
243}
244
245/**
246 * Does placeholder replacements in the style according to
247 * the ones defined in a templates style.ini file
248 *
249 * This also adds the ini defined placeholders as less variables
250 * (sans the surrounding __ and with a ini_ prefix)
251 *
252 * @author Andreas Gohr <andi@splitbrain.org>
253 *
254 * @param string $css
255 * @param array $replacements  array(placeholder => value)
256 * @return string
257 */
258function css_applystyle($css, $replacements) {
259    // we convert ini replacements to LESS variable names
260    // and build a list of variable: value; pairs
261    $less = '';
262    foreach((array) $replacements as $key => $value) {
263        $lkey = trim($key, '_');
264        $lkey = '@ini_'.$lkey;
265        $less .= "$lkey: $value;\n";
266
267        $replacements[$key] = $lkey;
268    }
269
270    // we now replace all old ini replacements with LESS variables
271    $css = strtr($css, $replacements);
272
273    // now prepend the list of LESS variables as the very first thing
274    $css = $less.$css;
275    return $css;
276}
277
278/**
279 * Load style ini contents
280 *
281 * Loads and merges style.ini files from template and config and prepares
282 * the stylesheet modes
283 *
284 * @author Andreas Gohr <andi@splitbrain.org>
285 *
286 * @param string $tpl the used template
287 * @param bool   $preview load preview replacements
288 * @return array with keys 'stylesheets' and 'replacements'
289 */
290function css_styleini($tpl, $flavour=DEFAULT_FLAVOUR, $preview=false) {
291    global $conf;
292
293    $stylesheets = array(); // mode, file => base
294    $replacements = array(); // placeholder => value
295
296    // load template style.ini replacements first
297    // they should be the base for the colors - if not the default flavour
298    $incbase = tpl_incdir($tpl);
299    $webbase = tpl_basedir($tpl);
300    $ini = $incbase.DEFAULT_FLAVOUR.'.ini';
301    if($flavour != DEFAULT_FLAVOUR && file_exists($ini)) {
302        $data = parse_ini_file($ini, true);
303        // replacements
304        if(is_array($data['replacements'])) {
305            $replacements = array_merge($replacements, css_fixreplacementurls($data['replacements'], $webbase));
306        }
307    }
308
309    // load template's style.ini
310    $ini = $incbase.$flavour.'.ini';
311    if(file_exists($ini)){
312        $data = parse_ini_file($ini, true);
313
314        // stylesheets
315        if(is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
316            $stylesheets[$mode][$incbase.$file] = $webbase;
317        }
318        // replacements
319        if(isset($data['replacements']) && is_array($data['replacements'])){
320            $replacements = array_merge($replacements, css_fixreplacementurls($data['replacements'],$webbase));
321        }
322    }
323
324    // load configs's style.ini
325    $webbase = DOKU_BASE;
326    $ini = DOKU_CONF."tpl/$tpl/style.ini";
327    $incbase = dirname($ini).'/';
328    if(file_exists($ini)){
329        $data = parse_ini_file($ini, true);
330
331        // stylesheets - but only if we are on the default flavour
332        if($flavour === DEFAULT_FLAVOUR && isset($data['stylesheets']) && is_array($data['stylesheets'])) foreach($data['stylesheets'] as $file => $mode){
333            $stylesheets[$mode][$incbase.$file] = $webbase;
334        }
335        // replacements
336        if(isset($data['replacements']) && is_array($data['replacements'])){
337            $replacements = array_merge($replacements, css_fixreplacementurls($data['replacements'],$webbase));
338        }
339    }
340
341    // allow replacement overwrites in preview mode
342    if($preview) {
343        $webbase = DOKU_BASE;
344        $ini     = $conf['cachedir'].'/preview.ini';
345        if(file_exists($ini)) {
346            $data = parse_ini_file($ini, true);
347            // replacements
348            if(is_array($data['replacements'])) {
349                $replacements = array_merge($replacements, css_fixreplacementurls($data['replacements'], $webbase));
350            }
351        }
352    }
353
354    return array(
355        'stylesheets' => $stylesheets,
356        'replacements' => $replacements
357    );
358}
359
360/**
361 * Amend paths used in replacement relative urls, refer FS#2879
362 *
363 * @author Chris Smith <chris@jalakai.co.uk>
364 *
365 * @param array $replacements with key-value pairs
366 * @param string $location
367 * @return array
368 */
369function css_fixreplacementurls($replacements, $location) {
370    foreach($replacements as $key => $value) {
371        $replacements[$key] = preg_replace('#(url\([ \'"]*)(?!/|data:|http://|https://| |\'|")#','\\1'.$location,$value);
372    }
373    return $replacements;
374}
375
376/**
377 * Wrapper for the files, content and mediatype for the event CSS_STYLES_INCLUDED
378 *
379 * @author Gerry Weißbach <gerry.w@gammaproduction.de>
380 *
381 * @param string $mediatype type ofthe current media files/content set
382 * @param array $files set of files that define the current mediatype
383 * @return array
384 */
385function css_filewrapper($mediatype, $flavour=DEFAULT_FLAVOUR, $files=array()){
386    return array(
387            'files'                 => $files,
388	        'mediatype'             => $mediatype,
389	        'flavour'               => $flavour,
390	        'encapsulate'           => in_array($mediatype, array('screen', 'print', 'handheld')),
391	        'encapsulationPrefix'   => '@media '.$mediatype
392        );
393}
394
395/**
396 * Prints the @media encapsulated default styles of DokuWiki
397 *
398 * @author Gerry Weißbach <gerry.w@gammaproduction.de>
399 *
400 * This function is being called by a CSS_STYLES_INCLUDED event
401 * The event can be distinguished by the mediatype which is:
402 *   DW_DEFAULT
403 */
404function css_defaultstyles(){
405	// print the default classes for interwiki links and file downloads
406    print '@media screen {';
407    css_interwiki();
408    css_filetypes();
409    print '}';
410}
411
412/**
413 * Prints classes for interwikilinks
414 *
415 * Interwiki links have two classes: 'interwiki' and 'iw_$name>' where
416 * $name is the identifier given in the config. All Interwiki links get
417 * an default style with a default icon. If a special icon is available
418 * for an interwiki URL it is set in it's own class. Both classes can be
419 * overwritten in the template or userstyles.
420 *
421 * @author Andreas Gohr <andi@splitbrain.org>
422 */
423function css_interwiki(){
424
425    // default style
426    echo 'a.interwiki {';
427    echo ' background: transparent url('.DOKU_BASE.'lib/images/interwiki.png) 0px 1px no-repeat;';
428    echo ' padding: 1px 0px 1px 16px;';
429    echo '}';
430
431    // additional styles when icon available
432    $iwlinks = getInterwiki();
433    foreach(array_keys($iwlinks) as $iw){
434        $class = preg_replace('/[^_\-a-z0-9]+/i','_',$iw);
435        if(file_exists(DOKU_INC.'lib/images/interwiki/'.$iw.'.png')){
436            echo "a.iw_$class {";
437            echo '  background-image: url('.DOKU_BASE.'lib/images/interwiki/'.$iw.'.png)';
438            echo '}';
439        }elseif(file_exists(DOKU_INC.'lib/images/interwiki/'.$iw.'.gif')){
440            echo "a.iw_$class {";
441            echo '  background-image: url('.DOKU_BASE.'lib/images/interwiki/'.$iw.'.gif)';
442            echo '}';
443        }
444    }
445}
446
447/**
448 * Prints classes for file download links
449 *
450 * @author Andreas Gohr <andi@splitbrain.org>
451 */
452function css_filetypes(){
453
454    // default style
455    echo '.mediafile {';
456    echo ' background: transparent url('.DOKU_BASE.'lib/images/fileicons/file.png) 0px 1px no-repeat;';
457    echo ' padding-left: 18px;';
458    echo ' padding-bottom: 1px;';
459    echo '}';
460
461    // additional styles when icon available
462    // scan directory for all icons
463    $exts = array();
464    if($dh = opendir(DOKU_INC.'lib/images/fileicons')){
465        while(false !== ($file = readdir($dh))){
466            if(preg_match('/([_\-a-z0-9]+(?:\.[_\-a-z0-9]+)*?)\.(png|gif)/i',$file,$match)){
467                $ext = strtolower($match[1]);
468                $type = '.'.strtolower($match[2]);
469                if($ext!='file' && (!isset($exts[$ext]) || $type=='.png')){
470                    $exts[$ext] = $type;
471                }
472            }
473        }
474        closedir($dh);
475    }
476    foreach($exts as $ext=>$type){
477        $class = preg_replace('/[^_\-a-z0-9]+/','_',$ext);
478        echo ".mf_$class {";
479        echo '  background-image: url('.DOKU_BASE.'lib/images/fileicons/'.$ext.$type.')';
480        echo '}';
481    }
482}
483
484/**
485 * Loads a given file and fixes relative URLs with the
486 * given location prefix
487 *
488 * @param string $file file system path
489 * @param string $location
490 * @return string
491 */
492function css_loadfile($file,$location=''){
493    $css_file = new DokuCssFile($file);
494    return $css_file->load($location);
495}
496
497/**
498 *  Helper class to abstract loading of css/less files
499 *
500 *  @author Chris Smith <chris@jalakai.co.uk>
501 */
502class DokuCssFile {
503
504    protected $filepath;             // file system path to the CSS/Less file
505    protected $location;             // base url location of the CSS/Less file
506    protected $relative_path = null;
507
508    public function __construct($file) {
509        $this->filepath = $file;
510    }
511
512    /**
513     * Load the contents of the css/less file and adjust any relative paths/urls (relative to this file) to be
514     * relative to the dokuwiki root: the web root (DOKU_BASE) for most files; the file system root (DOKU_INC)
515     * for less files.
516     *
517     * @param   string   $location   base url for this file
518     * @return  string               the CSS/Less contents of the file
519     */
520    public function load($location='') {
521        if (!file_exists($this->filepath)) return '';
522
523        $css = io_readFile($this->filepath);
524        if (!$location) return $css;
525
526        $this->location = $location;
527
528        $css = preg_replace_callback('#(url\( *)([\'"]?)(.*?)(\2)( *\))#',array($this,'replacements'),$css);
529        $css = preg_replace_callback('#(@import\s+)([\'"])(.*?)(\2)#',array($this,'replacements'),$css);
530
531        return $css;
532    }
533
534    /**
535     * Get the relative file system path of this file, relative to dokuwiki's root folder, DOKU_INC
536     *
537     * @return string   relative file system path
538     */
539    protected function getRelativePath(){
540
541        if (is_null($this->relative_path)) {
542            $basedir = array(DOKU_INC);
543
544            // during testing, files may be found relative to a second base dir, TMP_DIR
545            if (defined('DOKU_UNITTEST')) {
546                $basedir[] = realpath(TMP_DIR);
547            }
548
549            $basedir = array_map('preg_quote_cb', $basedir);
550            $regex = '/^('.join('|',$basedir).')/';
551            $this->relative_path = preg_replace($regex, '', dirname($this->filepath));
552        }
553
554        return $this->relative_path;
555    }
556
557    /**
558     * preg_replace callback to adjust relative urls from relative to this file to relative
559     * to the appropriate dokuwiki root location as described in the code
560     *
561     * @param  array    see http://php.net/preg_replace_callback
562     * @return string   see http://php.net/preg_replace_callback
563     */
564    public function replacements($match) {
565
566        // not a relative url? - no adjustment required
567        if (preg_match('#^(/|data:|https?://)#',$match[3])) {
568            return $match[0];
569        }
570        // a less file import? - requires a file system location
571        else if (substr($match[3],-5) == '.less') {
572            if ($match[3]{0} != '/') {
573                $match[3] = $this->getRelativePath() . '/' . $match[3];
574            }
575        }
576        // everything else requires a url adjustment
577        else {
578            $match[3] = $this->location . $match[3];
579        }
580
581        return join('',array_slice($match,1));
582    }
583}
584
585/**
586 * Convert local image URLs to data URLs if the filesize is small
587 *
588 * Callback for preg_replace_callback
589 *
590 * @param array $match
591 * @return string
592 */
593function css_datauri($match){
594    global $conf;
595
596    $pre   = unslash($match[1]);
597    $base  = unslash($match[2]);
598    $url   = unslash($match[3]);
599    $ext   = unslash($match[4]);
600
601    $local = DOKU_INC.$url;
602    $size  = @filesize($local);
603    if($size && $size < $conf['cssdatauri']){
604        $data = base64_encode(file_get_contents($local));
605    }
606    if($data){
607        $url = 'data:image/'.$ext.';base64,'.$data;
608    }else{
609        $url = $base.$url;
610    }
611    return $pre.$url;
612}
613
614
615/**
616 * Returns a list of possible Plugin Styles (no existance check here)
617 *
618 * @author Andreas Gohr <andi@splitbrain.org>
619 *
620 * @param string $mediatype
621 * @return array
622 */
623function css_pluginstyles($mediatype='screen'){
624    $list = array();
625    $plugins = plugin_list();
626    foreach ($plugins as $p){
627        $list[DOKU_PLUGIN."$p/$mediatype.css"]  = DOKU_BASE."lib/plugins/$p/";
628        $list[DOKU_PLUGIN."$p/$mediatype.less"]  = DOKU_BASE."lib/plugins/$p/";
629        // alternative for screen.css
630        if ($mediatype=='screen') {
631            $list[DOKU_PLUGIN."$p/style.css"]  = DOKU_BASE."lib/plugins/$p/";
632            $list[DOKU_PLUGIN."$p/style.less"]  = DOKU_BASE."lib/plugins/$p/";
633        }
634    }
635    return $list;
636}
637
638/**
639 * Very simple CSS optimizer
640 *
641 * @author Andreas Gohr <andi@splitbrain.org>
642 *
643 * @param string $css
644 * @return string
645 */
646function css_compress($css){
647    //strip comments through a callback
648    $css = preg_replace_callback('#(/\*)(.*?)(\*/)#s','css_comment_cb',$css);
649
650    //strip (incorrect but common) one line comments
651    $css = preg_replace_callback('/^.*\/\/.*$/m','css_onelinecomment_cb',$css);
652
653    // strip whitespaces
654    $css = preg_replace('![\r\n\t ]+!',' ',$css);
655    $css = preg_replace('/ ?([;,{}\/]) ?/','\\1',$css);
656    $css = preg_replace('/ ?: /',':',$css);
657
658    // number compression
659    $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"
660    $css = preg_replace('/([: ])\.(0)+((?:pt|pc|in|mm|cm|em|ex|px)\b|%)(?=[^\{]*[;\}])/', '$1$2', $css); // ".0em" to "0"
661    $css = preg_replace('/([: ]0)0*(\.0*)?((?:pt|pc|in|mm|cm|em|ex|px)(?=[^\{]*[;\}])\b|%)/', '$1', $css); // "0.0em" to "0"
662    $css = preg_replace('/([: ]\d+)(\.0*)((?:pt|pc|in|mm|cm|em|ex|px)(?=[^\{]*[;\}])\b|%)/', '$1$3', $css); // "1.0em" to "1em"
663    $css = preg_replace('/([: ])0+(\d+|\d*\.\d+)((?:pt|pc|in|mm|cm|em|ex|px)(?=[^\{]*[;\}])\b|%)/', '$1$2$3', $css); // "001em" to "1em"
664
665    // shorten attributes (1em 1em 1em 1em -> 1em)
666    $css = preg_replace('/(?<![\w\-])((?:margin|padding|border|border-(?:width|radius)):)([\w\.]+)( \2)+(?=[;\}]| !)/', '$1$2', $css); // "1em 1em 1em 1em" to "1em"
667    $css = preg_replace('/(?<![\w\-])((?:margin|padding|border|border-(?:width)):)([\w\.]+) ([\w\.]+) \2 \3(?=[;\}]| !)/', '$1$2 $3', $css); // "1em 2em 1em 2em" to "1em 2em"
668
669    // shorten colors
670    $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);
671
672    return $css;
673}
674
675/**
676 * Callback for css_compress()
677 *
678 * Keeps short comments (< 5 chars) to maintain typical browser hacks
679 *
680 * @author Andreas Gohr <andi@splitbrain.org>
681 *
682 * @param array $matches
683 * @return string
684 */
685function css_comment_cb($matches){
686    if(strlen($matches[2]) > 4) return '';
687    return $matches[0];
688}
689
690/**
691 * Callback for css_compress()
692 *
693 * Strips one line comments but makes sure it will not destroy url() constructs with slashes
694 *
695 * @param array $matches
696 * @return string
697 */
698function css_onelinecomment_cb($matches) {
699    $line = $matches[0];
700
701    $i = 0;
702    $len = strlen($line);
703
704    while ($i< $len){
705        $nextcom = strpos($line, '//', $i);
706        $nexturl = stripos($line, 'url(', $i);
707
708        if($nextcom === false) {
709            // no more comments, we're done
710            $i = $len;
711            break;
712        }
713
714        // keep any quoted string that starts before a comment
715        $nextsqt = strpos($line, "'", $i);
716        $nextdqt = strpos($line, '"', $i);
717        if(min($nextsqt, $nextdqt) < $nextcom) {
718            $skipto = false;
719            if($nextsqt !== false && ($nextdqt === false || $nextsqt < $nextdqt)) {
720                $skipto = strpos($line, "'", $nextsqt+1) +1;
721            } else if ($nextdqt !== false) {
722                $skipto = strpos($line, '"', $nextdqt+1) +1;
723            }
724
725            if($skipto !== false) {
726                $i = $skipto;
727                continue;
728            }
729        }
730
731        if($nexturl === false || $nextcom < $nexturl) {
732            // no url anymore, strip comment and be done
733            $i = $nextcom;
734            break;
735        }
736
737        // we have an upcoming url
738        $i = strpos($line, ')', $nexturl);
739    }
740
741    return substr($line, 0, $i);
742}
743
744//Setup VIM: ex: et ts=4 :
745