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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 Traversable; |
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final class LeetDecoder extends ChainableFormatter |
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{ |
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/** |
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* @var array<string, string[]> |
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*/ |
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private $encodeMap = [ |
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'A' => ['4', '@', '∂'], |
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'B' => ['8', 'ß'], |
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'C' => ['(', '¢', '<', '[', '©'], |
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'D' => ['∂'], |
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'E' => ['3', '€', 'є'], |
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'F' => ['ƒ'], |
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'G' => ['6', '9'], |
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'H' => ['#'], |
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'I' => ['1', '!', '|', ':'], |
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'J' => ['¿'], |
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'K' => ['X'], |
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'L' => ['1', '£', 'ℓ'], |
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'O' => ['0', '°'], |
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'R' => ['2', '®', 'Я'], |
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'S' => ['5', '$', '§'], |
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'T' => ['7', '†'], |
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'U' => ['µ'], |
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'W' => ['vv'], |
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'X' => ['×'], |
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'Y' => ['φ', '¥'], |
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'Z' => ['2', '≥'], |
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]; |
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/** |
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* @var array<string|int, string[]> |
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*/ |
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private $decodeMap = []; |
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public function __construct() |
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{ |
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foreach ($this->encodeMap as $char => $encodedChars) { |
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foreach ($encodedChars as $encodedChar) { |
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$this->decodeMap[$encodedChar][] = $char; |
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} |
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} |
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} |
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/** |
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* @param string $word Word to get decode map for. |
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* @return array<string|int, string[]> Map for decoding the word prefix. |
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*/ |
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private function getDecodeMap(string $word): array |
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{ |
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$decodeMap = []; |
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foreach ($this->decodeMap as $encodedChar => $chars) { |
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if ((string)$encodedChar === mb_substr($word, 0, mb_strlen((string)$encodedChar))) { |
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$decodeMap[$encodedChar] = $chars; |
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} |
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} |
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$decodeMap[mb_substr($word, 0, 1)][] = mb_substr($word, 0, 1); |
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return $decodeMap; |
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} |
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/** |
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* @param iterable<string> $words Words to format. |
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* @return Traversable<string> Leetspeak-decoded variants of the words. |
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*/ |
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protected function applyCurrent(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> Leetspeak-decoded variants of the word. |
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*/ |
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private function formatWord(string $word): Traversable |
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{ |
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if ($word === '') { |
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yield ''; |
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return; |
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} |
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foreach ($this->getDecodeMap($word) as $encodedChar => $chars) { |
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foreach ($this->formatWord(mb_substr($word, mb_strlen((string)$encodedChar))) as $suffix) { |
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foreach ($chars as $char) { |
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yield $char.$suffix; |
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} |
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} |
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} |
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} |
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} |
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Stadly /
PasswordPolice
