css = (string) $css; } /** * Compressor. * * @since 150510 Initial release. * * @param string $css Input CSS. */ public static function compress($css) { $css = (string) $css; try { $css_minifier = new static($css); $minified_css = $css_minifier->min(); return $minified_css; } catch (\Exception $exception) { return $css; } } /** * Minifier. * * @since 150510 Initial release. * * @return string Output (minified) CSS. */ public function min() { return $this->selfMin(); } /** * Self minifier. * * @since 15xxxx Adding SCSS compiler. * * @return string Output (minified) CSS. */ protected function selfMin() { if (!$this->css) { return $this->css; } $static = &static::$static[__FUNCTION__.'_map']; if (!isset($static['replace'], $static['with'], $static['colors'])) { $de_spacifiables = array( '{', '}', '!=', '|=', '^=', '$=', '*=', '~=', '=', '~', ';', ',', '>', ); $de_spacifiables = array_map( function ($string) { return preg_quote($string, '/'); }, $de_spacifiables ); $de_spacifiables = implode('|', $de_spacifiables); $static['replace'] = array( 'comments' => '/\/\*.*?\*\//s', 'line_breaks' => '/['."\r\n".']+/', 'extra_spaces' => '/\s{2,}/', 'de_spacifiables' => '/ *('.$de_spacifiables.') */', 'unnecessary_;s' => '/;\}/', ); $static['with'] = array('', ' ', ' ', '${1}', '}'); $static['colors'] = '/(?P[:,\h]+#)(?P[a-z0-9]{6})/i'; } $this->css = preg_replace($static['replace'], $static['with'], $this->css); $this->css = preg_replace_callback($static['colors'], array($this, 'selfMaybeCompressCssColorCb'), $this->css); $this->css = trim($this->css); return $this->css; } /** * Compresses HEX color codes. * * @since 140417 Initial release. * * @param array $m Regular expression matches. * * @return string Full match with compressed HEX color code. */ protected function selfMaybeCompressCssColorCb(array $m) { $m['hex'] = strtoupper($m['hex']); // Convert to uppercase for easy comparison. if ($m['hex'][0] === $m['hex'][1] && $m['hex'][2] === $m['hex'][3] && $m['hex'][4] === $m['hex'][5]) { return $m['context'].$m['hex'][0].$m['hex'][2].$m['hex'][4]; } return $m[0]; } }