Skip to content

added support for CSS specificity #8

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 1 commit into from
Closed

added support for CSS specificity #8

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
97 changes: 77 additions & 20 deletions CSSParser.php
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4,11 +4,48 @@
* @package html
* CSSParser class parses CSS from text into a data structure.
*/
class CSSParser {
class CSSParser {
const
NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX = '/
(\.[\w]+) # classes
|
\[(\w+) # attributes
|
(\:( # pseudo classes
link|visited|active
|hover|focus
|lang
|target
|enabled|disabled|checked|indeterminate
|root
|nth-child|nth-last-child|nth-of-type|nth-last-of-type
|first-child|last-child|first-of-type|last-of-type
|only-child|only-of-type
|empty|contains
))
/ix',
ELEMENTS_AND_PSEUDO_ELEMENTS_RX = '/
((^|[\s\+\>\~]+)[\w]+ # elements
|
\:{1,2}( # pseudo-elements
after|before
|first-letter|first-line
|selection
)
)/ix';

private $sText;
private $iCurrentPosition;
private $iLength;

public static function computeSpecificity($selector){
$a = 0;
$b = substr_count($selector, '#');
$c = preg_match_all(self::NON_ID_ATTRIBUTES_AND_PSEUDO_CLASSES_RX, $selector, $matches);
$d = preg_match_all(self::ELEMENTS_AND_PSEUDO_ELEMENTS_RX, $selector, $matches);
return ($a*1000) + ($b*100) + ($c*10) + $d;
}

public function __construct($sText, $sDefaultCharset = 'utf-8') {
$this->sText = $sText;
$this->iCurrentPosition = 0;
Expand Down Expand Up @@ -179,13 +216,25 @@ private function parseCharacter($bIsForIdentifier) {
return null;
}

private function parseSelector() {
$oResult = new CSSSelector();
$oResult->setSelector($this->consumeUntil('{'));
$this->consume('{');
$this->consumeWhiteSpace();
$this->parseRuleSet($oResult);
return $oResult;
private function parseSelector() {
$oResult = new NullCSSRuleSet();
$selectors = explode( ',', $this->consumeUntil('{') );
$this->consume('{');
$this->consumeWhiteSpace();
$this->parseRuleSet($oResult);

$aSelectors = array();
foreach($selectors as $selector)
{
$oSelector = new CSSSelector();
$oSelector->setSelector(trim($selector));
foreach ($oResult->getRules() as $rule)
{
$oSelector->addRule($rule);
}
$aSelectors[] = $oSelector;
}
return $aSelectors;
}

private function parseRuleSet($oRuleSet) {
Expand Down Expand Up @@ -614,6 +663,8 @@ public function __toString() {
}
}

class NullCSSRuleSet extends CSSRuleSet {}

class CSSAtRule extends CSSRuleSet {
private $sType;

Expand All @@ -631,30 +682,36 @@ public function __toString() {
}

class CSSSelector extends CSSRuleSet {
private $aSelector;
private
$sSelector = '',
$iSpecificity = 0,
$bIsInlineStyle = false;

public function __construct() {
parent::__construct();
$this->aSelector = array();
}

public function setSelector($mSelector) {
if(is_array($mSelector)) {
$this->aSelector = $mSelector;
} else {
$this->aSelector = explode(',', $mSelector);
}
foreach($this->aSelector as $iKey => $sSelector) {
$this->aSelector[$iKey] = trim($sSelector);
}
$this->sSelector = $mSelector;
$this->iSpecificity = CSSParser::computeSpecificity($mSelector);
}

public function getSelector() {
return $this->aSelector;
return $this->sSelector;
}

public function setSpecificity($iSpecificity)
{
$this->iSpecificity = $iSpecificity;
}

public function getSpecificity()
{
return $this->iSpecificity;
}

public function __toString() {
$sResult = implode(', ', $this->aSelector).' {';
$sResult = $this->sSelector . ' {';
$sResult .= parent::__toString();
$sResult .= '}';
return $sResult;
Expand Down