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<?php declare(strict_types=1);
namespace Stratadox\Parser\Parsers;
use Stratadox\Parser\Helpers\Cast;
use Stratadox\Parser\Parser;
use Stratadox\Parser\Result;
use Stratadox\Parser\Results\Error;
use function array_merge;
use function strlen;
use const INF;
/**
* Either / Or
*
* Returns the first matching parser of the lot.
* If none of the parsers match, returns the error of one that got furthest.
*/
final class Either extends Parser
{
/** @param Parser[] $options */
public function __construct(private array $options) {}
public static function of(Parser|string ...$options): Parser
return new self(Cast::asParsers(...$options));
}
public function parse(string $input): Result
$error = null;
$errorPosition = INF;
foreach ($this->options as $parser) {
$result = $parser->parse($input);
if ($result->ok()) {
return $result;
$pos = strlen($result->unparsed());
if ($pos < $errorPosition) {
$errorPosition = $pos;
$error = $result;
return $error ?: Error::in($input);
public function or(string|Parser ...$other): Parser
return new self(array_merge($this->options, Cast::asParsers(...$other)));
Stratadox /
Parser
