Source: https://github.com/sabberworm/PHP-CSS-Parser
/**
*/
protected function _minify($data)
{
$out = '';
foreach ($data as $uri => $file) {
if (!is_readable($file)) {
$this->_opts['logger']->log(sprintf('Could not open CSS file %s.', $file), Horde_Log::ERR);
continue;
}
$css = file_get_contents($file);
try {
$parser = new Horde_Css_Parser($css);
} catch (Exception $e) {
/* If the CSS is broken, log error and output as-is. */
$this->_opts['logger']->log($e, Horde_Log::ERR);
$out .= $css;
continue;
}
if (!empty($this->_opts['import'])) {
foreach ($parser->doc->getContents() as $val) {
if ($val instanceof Sabberworm\CSS\Property\Import) {
$res = call_user_func($this->_opts['import'], dirname($uri) . '/' . $val->getLocation()->getURL()->getString());
$out .= $this->_minify(array($res[0] => $res[1]));
$parser->doc->remove($val);
}
}
}
$url = array();
foreach ($parser->doc->getAllRuleSets() as $val) {
foreach ($val->getRules('background-') as $val2) {
$item = $val2->getValue();
if ($item instanceof Sabberworm\CSS\Value\URL) {
$url[] = $item;
} elseif ($item instanceof Sabberworm\CSS\Value\RuleValueList) {
foreach ($item->getListComponents() as $val3) {
if ($val3 instanceof Sabberworm\CSS\Value\URL) {
$url[] = $val3;
}
}
}
}
}
foreach ($url as $val) {
$url_ob = $val->getURL();
$url_str = ltrim($url_ob->getString());
if (stripos($url_str, 'http') !== 0 && !Horde_Url_Data::isData($url_str)) {
$url_str = dirname($uri) . '/' . $url_str;
if (!empty($this->_opts['dataurl'])) {
$url_str = call_user_func($this->_opts['dataurl'], $url_str);
}
}
$url_ob->setString($url_str);
}
$out .= $parser->compress();
}
return $out;
}
public function testDoubleAsteriskAtBeginningOfComment()
{
$a = '/** Foo */#bar{width:1px;}';
$css = new Horde_Css_Parser($a);
$this->assertEquals('#bar{width:1px}', $css->compress());
}
/**
* @small
*/
public function testEmptyDocument()
{
$css = new Horde_Css_Parser('');
$this->assertEquals('', $css->compress());
}