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<?php |
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declare(strict_types=1); |
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namespace Stadly\PasswordPolice\WordFormatter; |
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use InvalidArgumentException; |
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use Stadly\PasswordPolice\WordFormatter; |
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use Traversable; |
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final class Substring implements WordFormatter |
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{ |
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/** |
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* @var int Minimum substring length. |
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*/ |
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private $minLength; |
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/** |
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* @var int|null Maximum substring length. |
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*/ |
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private $maxLength; |
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/** |
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* @param int $minLength Ignore substrings shorter thant this. |
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* @param int|null $maxLength Ignore substrings longer than this. |
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*/ |
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public function __construct(int $minLength = 3, ?int $maxLength = 25) |
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{ |
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if ($minLength < 1) { |
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throw new InvalidArgumentException('Min length must be positive.'); |
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} |
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if ($maxLength !== null && $maxLength < $minLength) { |
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throw new InvalidArgumentException('Max length cannot be smaller than min length.'); |
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} |
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$this->minLength = $minLength; |
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$this->maxLength = $maxLength; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function apply(iterable $words): Traversable |
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{ |
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foreach ($words as $word) { |
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yield from $this->formatWord($word); |
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} |
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} |
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/** |
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* @param string $word Word to format. |
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* @return Traversable<string> Formatted words. May contain duplicates. |
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*/ |
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private function formatWord(string $word): Traversable |
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{ |
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for ($start = 0; $start < mb_strlen($word); ++$start) { |
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$substring = mb_substr($word, $start, $this->maxLength); |
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for ($length = mb_strlen($substring); $this->minLength <= $length; --$length) { |
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yield mb_substr($substring, 0, $length); |
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} |
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} |
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} |
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} |
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Stadly /
PasswordPolice
