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Wikimedia\CSS\Grammar\TokenMatcher
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 __construct
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<?php
/**
 * @file
 * @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
 */
namespace Wikimedia\CSS\Grammar;
use Wikimedia\CSS\Objects\ComponentValueList;
use Wikimedia\CSS\Objects\Token;
/**
 * Matcher that matches a token of a particular type
 * @see https://www.w3.org/TR/2016/CR-css-values-3-20160929/#component-types
 */
class TokenMatcher extends Matcher {
    /** @var string One of the Token::T_* constants */
    protected $type;
    /** @var callable|null Something to call to further validate the token */
    protected $callback = null;
    /**
     * @param string $type Token type to match
     * @param callable|null $callback Something to call to further validate the token.
     *  bool callback( Token )
     */
    public function __construct( $type, callable $callback = null ) {
        $this->type = $type;
        $this->callback = $callback;
    }
    /** @inheritDoc */
    protected function generateMatches( ComponentValueList $values, $start, array $options ) {
        $cv = $values[$start] ?? null;
        if ( $cv instanceof Token && $cv->type() === $this->type &&
            ( !$this->callback || call_user_func( $this->callback, $cv ) )
        ) {
            yield $this->makeMatch( $values, $start, $this->next( $values, $start, $options ) );
        }
    }
}