s, but will work for * other types (case-insensitively) too. For delimiter (or case-sensitive) * matching, use DelimMatcher. * * @see https://www.w3.org/TR/2019/CR-css-values-3-20190606/#component-types */ class KeywordMatcher extends Matcher { /** @var string One of the Token::T_* constants */ protected $type; /** @var array Associative array with keys being the values to match */ protected $values; /** * @param string|string[] $values Token values to match * @param array $options Options * - type: (string) Token type to match. Default is Token::T_IDENT. */ public function __construct( $values, array $options = [] ) { $options += [ 'type' => Token::T_IDENT, ]; $this->values = array_flip( array_map( 'strtolower', (array)$values ) ); $this->type = $options['type']; } /** @inheritDoc */ protected function generateMatches( ComponentValueList $values, $start, array $options ) { $cv = $values[$start] ?? null; if ( $cv instanceof Token && $cv->type() === $this->type && isset( $this->values[strtolower( $cv->value() )] ) ) { yield $this->makeMatch( $values, $start, $this->next( $values, $start, $options ) ); } } }