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<?php
/**
* This file is part of Railt package.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace Railt\Compiler\Grammar\PP2;
* Class Mapping
class Mapping
{
* @var array
private $mappings = [];
* @var int
private $lastId = 0;
* @param string|null $rule
* @return int
public function id(string $rule = null): int
if ($rule === null) {
return $this->lastId++;
}
if (! $this->has($rule)) {
$this->mappings[$rule] = $this->lastId++;
return $this->mappings[$rule];
* @param string $rule
* @return bool
public function has(string $rule): bool
return \array_key_exists($rule, $this->mappings);
railt /
compiler
