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<?php declare(strict_types=1);
/**
* @package s9e\RegexpBuilder
* @copyright Copyright (c) 2016-2022 The s9e authors
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\RegexpBuilder\Passes;
* Replaces (?:aa|b|cc|d) with (?:[bd]|aa|cc)
* Enables other passes to replace (?:[xy]|a[xy]) with a?[xy]
class GroupSingleCharacters extends AbstractPass
{
* {@inheritdoc}
protected function runPass(array $strings): array
$singles = $this->getSingleCharStrings($strings);
$cnt = count($singles);
if ($cnt > 1 && $cnt < count($strings))
// Remove the singles from the input, then prepend them as a new string
$strings = array_diff_key($strings, $singles);
array_unshift($strings, [array_values($singles)]);
}
return $strings;
* Return an array of every single-char string in given list of strings
*
* @param array[] $strings
* @return array[]
protected function getSingleCharStrings(array $strings): array
return array_filter($strings, [$this, 'isSingleCharString']);
s9e /
RegexpBuilder
