/**
* Processes incoming CSS optimising it and then returning it.
*
* @param string $css The raw CSS to optimise
* @return string The optimised CSS
*/
public function process($css)
{
global $CFG;
$this->reset_stats();
$this->timestart = microtime(true);
$this->rawstrlen = strlen($css);
// First up we need to remove all line breaks - this allows us to instantly
// reduce our processing requirements and as we will process everything
// into a new structure there's really nothing lost.
$css = preg_replace('#\\r?\\n#', ' ', $css);
// Next remove the comments... no need to them in an optimised world and
// knowing they're all gone allows us to REALLY make our processing simpler
$css = preg_replace('#/\\*(.*?)\\*/#m', '', $css, -1, $this->commentsincss);
$medias = array('all' => new css_media());
$imports = array();
$charset = false;
$currentprocess = self::PROCESSING_START;
$currentrule = css_rule::init();
$currentselector = css_selector::init();
$inquotes = false;
// ' or "
$inbraces = false;
// {
$inbrackets = false;
// [
$inparenthesis = false;
// (
$currentmedia = $medias['all'];
$currentatrule = null;
$suspectatrule = false;
$buffer = '';
$char = null;
// Next we are going to iterate over every single character in $css.
// This is why we removed line breaks and comments!
for ($i = 0; $i < $this->rawstrlen; $i++) {
$lastchar = $char;
$char = substr($css, $i, 1);
if ($char == '@' && $buffer == '') {
$suspectatrule = true;
}
switch ($currentprocess) {
// Start processing an at rule e.g. @media, @page
case self::PROCESSING_ATRULE:
switch ($char) {
case ';':
if (!$inbraces) {
$buffer .= $char;
if ($currentatrule == 'import') {
$imports[] = $buffer;
$currentprocess = self::PROCESSING_SELECTORS;
} else {
if ($currentatrule == 'charset') {
$charset = $buffer;
$currentprocess = self::PROCESSING_SELECTORS;
}
}
}
$buffer = '';
$currentatrule = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '{':
if ($currentatrule == 'media' && preg_match('#\\s*@media\\s*([a-zA-Z0-9]+(\\s*,\\s*[a-zA-Z0-9]+)*)#', $buffer, $matches)) {
$mediatypes = str_replace(' ', '', $matches[1]);
if (!array_key_exists($mediatypes, $medias)) {
$medias[$mediatypes] = new css_media($mediatypes);
}
$currentmedia = $medias[$mediatypes];
$currentprocess = self::PROCESSING_SELECTORS;
$buffer = '';
}
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
// Start processing selectors
// Start processing selectors
// Start processing selectors
// Start processing selectors
case self::PROCESSING_START:
case self::PROCESSING_SELECTORS:
switch ($char) {
case '[':
$inbrackets++;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ']':
$inbrackets--;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ' ':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
if (!empty($buffer)) {
if ($suspectatrule && preg_match('#@(media|import|charset)\\s*#', $buffer, $matches)) {
$currentatrule = $matches[1];
$currentprocess = self::PROCESSING_ATRULE;
$buffer .= $char;
} else {
$currentselector->add($buffer);
$buffer = '';
}
}
$suspectatrule = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '{':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
$currentselector->add($buffer);
$currentrule->add_selector($currentselector);
$currentselector = css_selector::init();
$currentprocess = self::PROCESSING_STYLES;
$buffer = '';
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '}':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
if ($currentatrule == 'media') {
$currentmedia = $medias['all'];
$currentatrule = false;
$buffer = '';
}
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ',':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
$currentselector->add($buffer);
$currentrule->add_selector($currentselector);
$currentselector = css_selector::init();
$buffer = '';
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
// Start processing styles
// Start processing styles
// Start processing styles
// Start processing styles
case self::PROCESSING_STYLES:
if ($char == '"' || $char == "'") {
if ($inquotes === false) {
$inquotes = $char;
}
if ($inquotes === $char && $lastchar !== '\\') {
$inquotes = false;
}
}
if ($inquotes) {
$buffer .= $char;
continue 2;
}
switch ($char) {
case ';':
if ($inparenthesis) {
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
$currentrule->add_style($buffer);
$buffer = '';
$inquotes = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '}':
$currentrule->add_style($buffer);
$this->rawselectors += $currentrule->get_selector_count();
$currentmedia->add_rule($currentrule);
$currentrule = css_rule::init();
$currentprocess = self::PROCESSING_SELECTORS;
$this->rawrules++;
$buffer = '';
$inquotes = false;
$inparenthesis = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '(':
$inparenthesis = true;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ')':
$inparenthesis = false;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
}
$buffer .= $char;
}
$css = '';
if (!empty($charset)) {
$imports[] = $charset;
}
if (!empty($imports)) {
$css .= implode("\n", $imports);
$css .= "\n\n";
}
foreach ($medias as $media) {
$media->organise_rules_by_selectors();
$this->optimisedrules += $media->count_rules();
$this->optimisedselectors += $media->count_selectors();
if ($media->has_errors()) {
$this->errors[] = $media->get_errors();
}
$css .= $media->out();
}
$this->optimisedstrlen = strlen($css);
$this->timecomplete = microtime(true);
return trim($css);
}
/**
* Processes incoming CSS optimising it and then returning it.
*
* @param string $css The raw CSS to optimise
* @return string The optimised CSS
*/
public function process($css)
{
global $CFG;
// Easiest win there is
$css = trim($css);
$this->reset_stats();
$this->timestart = microtime(true);
$this->rawstrlen = strlen($css);
// Don't try to process files with no content... it just doesn't make sense.
// But we should produce an error for them, an empty CSS file will lead to a
// useless request for those running theme designer mode.
if ($this->rawstrlen === 0) {
$this->errors[] = 'Skipping file as it has no content.';
return '';
}
// First up we need to remove all line breaks - this allows us to instantly
// reduce our processing requirements and as we will process everything
// into a new structure there's really nothing lost.
$css = preg_replace('#\\r?\\n#', ' ', $css);
// Next remove the comments... no need to them in an optimised world and
// knowing they're all gone allows us to REALLY make our processing simpler
$css = preg_replace('#/\\*(.*?)\\*/#m', '', $css, -1, $this->commentsincss);
$medias = array('all' => new css_media());
$imports = array();
$charset = false;
// Keyframes are used for CSS animation they will be processed right at the very end.
$keyframes = array();
$currentprocess = self::PROCESSING_START;
$currentrule = css_rule::init();
$currentselector = css_selector::init();
$inquotes = false;
// ' or "
$inbraces = false;
// {
$inbrackets = false;
// [
$inparenthesis = false;
// (
$currentmedia = $medias['all'];
$currentatrule = null;
$suspectatrule = false;
$buffer = '';
$char = null;
// Next we are going to iterate over every single character in $css.
// This is why we removed line breaks and comments!
for ($i = 0; $i < $this->rawstrlen; $i++) {
$lastchar = $char;
$char = substr($css, $i, 1);
if ($char == '@' && $buffer == '') {
$suspectatrule = true;
}
switch ($currentprocess) {
// Start processing an @ rule e.g. @media, @page, @keyframes
case self::PROCESSING_ATRULE:
switch ($char) {
case ';':
if (!$inbraces) {
$buffer .= $char;
if ($currentatrule == 'import') {
$imports[] = $buffer;
$currentprocess = self::PROCESSING_SELECTORS;
} else {
if ($currentatrule == 'charset') {
$charset = $buffer;
$currentprocess = self::PROCESSING_SELECTORS;
}
}
}
if ($currentatrule !== 'media') {
$buffer = '';
$currentatrule = false;
}
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '{':
if ($currentatrule == 'media' && preg_match('#\\s*@media\\s*([a-zA-Z0-9]+(\\s*,\\s*[a-zA-Z0-9]+)*)\\s*{#', $buffer, $matches)) {
// Basic media declaration
$mediatypes = str_replace(' ', '', $matches[1]);
if (!array_key_exists($mediatypes, $medias)) {
$medias[$mediatypes] = new css_media($mediatypes);
}
$currentmedia = $medias[$mediatypes];
$currentprocess = self::PROCESSING_SELECTORS;
$buffer = '';
} else {
if ($currentatrule == 'media' && preg_match('#\\s*@media\\s*([^{]+)#', $buffer, $matches)) {
// Advanced media query declaration http://www.w3.org/TR/css3-mediaqueries/
$mediatypes = $matches[1];
$hash = md5($mediatypes);
$medias[$hash] = new css_media($mediatypes);
$currentmedia = $medias[$hash];
$currentprocess = self::PROCESSING_SELECTORS;
$buffer = '';
} else {
if ($currentatrule == 'keyframes' && preg_match('#@((\\-moz\\-|\\-webkit\\-)?keyframes)\\s*([^\\s]+)#', $buffer, $matches)) {
// Keyframes declaration, we treat it exactly like a @media declaration except we don't allow
// them to be overridden to ensure we don't mess anything up. (means we keep everything in order)
$keyframefor = $matches[1];
$keyframename = $matches[3];
$keyframe = new css_keyframe($keyframefor, $keyframename);
$keyframes[] = $keyframe;
$currentmedia = $keyframe;
$currentprocess = self::PROCESSING_SELECTORS;
$buffer = '';
}
}
}
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
// Start processing selectors
// Start processing selectors
case self::PROCESSING_START:
case self::PROCESSING_SELECTORS:
switch ($char) {
case '[':
$inbrackets++;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ']':
$inbrackets--;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ' ':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
if (!empty($buffer)) {
// Check for known @ rules
if ($suspectatrule && preg_match('#@(media|import|charset|(\\-moz\\-|\\-webkit\\-)?(keyframes))\\s*#', $buffer, $matches)) {
$currentatrule = !empty($matches[3]) ? $matches[3] : $matches[1];
$currentprocess = self::PROCESSING_ATRULE;
$buffer .= $char;
} else {
$currentselector->add($buffer);
$buffer = '';
}
}
$suspectatrule = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '{':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
if ($buffer !== '') {
$currentselector->add($buffer);
}
$currentrule->add_selector($currentselector);
$currentselector = css_selector::init();
$currentprocess = self::PROCESSING_STYLES;
$buffer = '';
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '}':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
if ($currentatrule == 'media') {
$currentmedia = $medias['all'];
$currentatrule = false;
$buffer = '';
} else {
if (strpos($currentatrule, 'keyframes') !== false) {
$currentmedia = $medias['all'];
$currentatrule = false;
$buffer = '';
}
}
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ',':
if ($inbrackets) {
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
$currentselector->add($buffer);
$currentrule->add_selector($currentselector);
$currentselector = css_selector::init();
$buffer = '';
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
// Start processing styles
// Start processing styles
case self::PROCESSING_STYLES:
if ($char == '"' || $char == "'") {
if ($inquotes === false) {
$inquotes = $char;
}
if ($inquotes === $char && $lastchar !== '\\') {
$inquotes = false;
}
}
if ($inquotes) {
$buffer .= $char;
continue 2;
}
switch ($char) {
case ';':
if ($inparenthesis) {
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
$currentrule->add_style($buffer);
$buffer = '';
$inquotes = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '}':
$currentrule->add_style($buffer);
$this->rawselectors += $currentrule->get_selector_count();
$currentmedia->add_rule($currentrule);
$currentrule = css_rule::init();
$currentprocess = self::PROCESSING_SELECTORS;
$this->rawrules++;
$buffer = '';
$inquotes = false;
$inparenthesis = false;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case '(':
$inparenthesis = true;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
case ')':
$inparenthesis = false;
$buffer .= $char;
// continue 1: The switch processing chars
// continue 2: The switch processing the state
// continue 3: The for loop
continue 3;
}
break;
}
$buffer .= $char;
}
foreach ($medias as $media) {
$this->optimise($media);
}
$css = $this->produce_css($charset, $imports, $medias, $keyframes);
$this->timecomplete = microtime(true);
return trim($css);
}