FilteredRadixSerialMapping.php

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<?php
 
namespace MediaWiki\User\TempUser;
 
use Wikimedia\ArrayUtils\ArrayUtils;
 
class FilteredRadixSerialMapping implements SerialMapping {
    private readonly int $radix;
 
    private readonly array $badIndexes;
 
    private readonly bool $uppercase;
 
    public function __construct( array $config ) {
        $this->radix = $config['radix'] ?? 10;
        $this->badIndexes = $config['badIndexes'] ?? [];
        $this->uppercase = $config['uppercase'] ?? false;
    }
 
    public function getSerialIdForIndex( int $index ): string {
        $index = $this->adjustID( $index );
        return \Wikimedia\base_convert( (string)$index, 10, $this->radix, 1, !$this->uppercase );
    }
 
    private function adjustID( int $id ): int {
        $pos = ArrayUtils::findLowerBound(
            fn ( $i ) => $this->badIndexes[$i],
            count( $this->badIndexes ),
            static fn ( $a, $b ) => $a <=> $b,
            $id
        );
        return $pos === false ? $id : $id + $pos + 1;
    }
}