Remove empty blocks

[Reza Ardestani]

I need to remove blocks without values. The codes work but when the block is inside @media it does not work as expected.

Is it a bug or I am missing sth?

Sample:

$content = 'body{color: green;}
.post {}
@media (max-width: 767.98px) {.title {}}'

$parser = new Sabberworm\CSS\Parser( $content );
$parser = $parser->parse();

foreach ( $parser->getAllDeclarationBlocks() as $block ) {
	if ( ! empty ( $block->getRules() ) ) {
	 	continue;
	}
	$parser->removeDeclarationBlockBySelector( $block );
}

Result:

body{color: green;}
@media (max-width: 767.98px) {.title {}}

Expectation:

body{color: green;}

[Raphael Schweikert]

It’s most likely a bug. But there may be other ways of doing what you want. getAllDeclarationBlocks and removeDeclarationBlockBySelector are both essentially convenience methods that do the recursion for you.

[Ivailo Hristov]

@reardestani That's because removeDeclarationBlockBySelector doesn't recurse. However what you are doing is dangerous anyway, because there might be non-empty blocks with the same selector.
You should do it like this:

function removeBlanks($oList) {
    foreach ($oList->getContents() as $oBlock) {
        if ($oBlock instanceof Sabberworm\CSS\RuleSet\DeclarationBlock) {
            if ( empty ( $oBlock->getRules() ) ) {
                $oList->remove( $oBlock );
            }
        } else if ($oBlock instanceof Sabberworm\CSS\CSSList\CSSBlockList) {
            removeBlanks($oBlock);
            /* Uncomment if you want to remove empty @media blocks as well
            if (empty($oBlock->getContents())) {
                $oList->remove($oBlock);
            }
            */
        }
    }
}
removeBlanks($parser);