public static function compile($source, $path, $todir, $importdirs)
{
// call Less to compile
$parser = new lessc();
$parser->setImportDir(array_keys($importdirs));
$parser->setPreserveComments(true);
$output = $parser->compile($source);
// update url
$arr = preg_split(CANVASLess::$rsplitbegin . CANVASLess::$kfilepath . CANVASLess::$rsplitend, $output, -1, PREG_SPLIT_DELIM_CAPTURE);
$output = '';
$file = $relpath = '';
$isfile = false;
foreach ($arr as $s) {
if ($isfile) {
$isfile = false;
$file = $s;
$relpath = CANVASLess::relativePath($todir, dirname($file));
$output .= "\n#" . CANVASLess::$kfilepath . "{content: \"{$file}\";}\n";
} else {
$output .= ($file ? CANVASPath::updateUrl($s, $relpath) : $s) . "\n\n";
$isfile = true;
}
}
return $output;
}
/**
* @param $tpl template object
* @return bool optimize success or not
*/
public static function optimizecss($tpl)
{
$outputpath = JPATH_ROOT . '/' . $tpl->getParam('canvas-assets', 'canvas-assets') . '/css';
$outputurl = JURI::root(true) . '/' . $tpl->getParam('canvas-assets', 'canvas-assets') . '/css';
if (!JFile::exists($outputpath)) {
JFolder::create($outputpath);
@chmod($outputpath, 0755);
}
if (!is_writeable($outputpath)) {
return false;
}
//prepare config
self::prepare($tpl);
$doc = JFactory::getDocument();
//======================= Group css ================= //
$mediagroup = array();
$cssgroups = array();
$stylesheets = array();
$ielimit = 4095;
$selcounts = 0;
$regex = '/\\{.+?\\}|,/s';
//selector counter
$csspath = '';
// group css into media
$mediagroup['all'] = array();
$mediagroup['screen'] = array();
foreach ($doc->_styleSheets as $url => $stylesheet) {
$media = $stylesheet['media'] ? $stylesheet['media'] : 'all';
if (empty($mediagroup[$media])) {
$mediagroup[$media] = array();
}
$mediagroup[$media][$url] = $stylesheet;
}
foreach ($mediagroup as $media => $group) {
$stylesheets = array();
// empty - begin a new group
foreach ($group as $url => $stylesheet) {
$url = self::fixUrl($url);
if ($stylesheet['mime'] == 'text/css' && ($csspath = self::cssPath($url))) {
$stylesheet['path'] = $csspath;
$stylesheet['data'] = file_get_contents($csspath);
$selcount = preg_match_all($regex, $stylesheet['data'], $matched);
if (!$selcount) {
$selcount = 1;
//just for sure
}
//if we found an @import rule or reach IE limit css selector count, break into the new group
if (preg_match('#@import\\s+.+#', $stylesheet['data']) || $selcounts + $selcount >= $ielimit) {
if (count($stylesheets)) {
$cssgroup = array();
$groupname = array();
foreach ($stylesheets as $gurl => $gsheet) {
$cssgroup[$gurl] = $gsheet;
$groupname[] = $gurl;
}
$cssgroup['groupname'] = implode('', $groupname);
$cssgroup['media'] = $media;
$cssgroups[] = $cssgroup;
}
$stylesheets = array($url => $stylesheet);
// empty - begin a new group
$selcounts = $selcount;
} else {
$stylesheets[$url] = $stylesheet;
$selcounts += $selcount;
}
} else {
// first get all the stylsheets up to this point, and get them into
// the items array
if (count($stylesheets)) {
$cssgroup = array();
$groupname = array();
foreach ($stylesheets as $gurl => $gsheet) {
$cssgroup[$gurl] = $gsheet;
$groupname[] = $gurl;
}
$cssgroup['groupname'] = implode('', $groupname);
$cssgroup['media'] = $media;
$cssgroups[] = $cssgroup;
}
//mark ignore current stylesheet
$cssgroup = array($url => $stylesheet, 'ignore' => true);
$cssgroups[] = $cssgroup;
$stylesheets = array();
// empty - begin a new group
}
}
if (count($stylesheets)) {
$cssgroup = array();
$groupname = array();
foreach ($stylesheets as $gurl => $gsheet) {
$cssgroup[$gurl] = $gsheet;
$groupname[] = $gurl;
}
$cssgroup['groupname'] = implode('', $groupname);
$cssgroup['media'] = $media;
$cssgroups[] = $cssgroup;
}
}
//======================= Group css ================= //
$output = array();
foreach ($cssgroups as $cssgroup) {
if (isset($cssgroup['ignore'])) {
unset($cssgroup['ignore']);
unset($cssgroup['groupname']);
unset($cssgroup['media']);
foreach ($cssgroup as $furl => $fsheet) {
$output[$furl] = $fsheet;
}
} else {
$media = $cssgroup['media'];
$groupname = 'css-' . substr(md5($cssgroup['groupname']), 0, 5) . '.css';
$groupfile = $outputpath . '/' . $groupname;
$grouptime = JFile::exists($groupfile) ? @filemtime($groupfile) : -1;
$rebuild = $grouptime < 0;
//filemtime == -1 => rebuild
unset($cssgroup['groupname']);
unset($cssgroup['media']);
foreach ($cssgroup as $furl => $fsheet) {
if (!$rebuild && @filemtime($fsheet['path']) > $grouptime) {
$rebuild = true;
}
}
if ($rebuild) {
$cssdata = array();
foreach ($cssgroup as $furl => $fsheet) {
$cssdata[] = "\n\n/*===============================";
$cssdata[] = $furl;
$cssdata[] = "================================================================================*/";
$cssmin = self::minifyCss($fsheet['data']);
$cssmin = CANVASPath::updateUrl($cssmin, CANVASPath::relativePath($outputurl, dirname($furl)));
$cssdata[] = $cssmin;
}
$cssdata = implode("\n", $cssdata);
if (!JFile::write($groupfile, $cssdata)) {
// cannot write file, ignore minify
return false;
}
$grouptime = @filemtime($groupfile);
@chmod($groupfile, 0644);
}
$output[$outputurl . '/' . $groupname . '?t=' . $grouptime % 1000] = array('mime' => 'text/css', 'media' => $media == 'all' ? NULL : $media, 'attribs' => array());
}
}
//apply the change make change
$doc->_styleSheets = $output;
}
