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<?php |
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declare(strict_types=1); |
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namespace Stadly\PasswordPolice\CharTree; |
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use InvalidArgumentException; |
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use Stadly\PasswordPolice\CharTree; |
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final class Cutter |
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{ |
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/** |
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* @var (string|CharTree)[][][] Memoization of cut character trees. |
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*/ |
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private static $memoization = []; |
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/** |
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* @param CharTree $charTree Character tree to cut. |
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* @param int $position Number of characters before cut. |
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* @return (string|CharTree)[][] Cut variants of the character tree. |
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*/ |
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public function cut(CharTree $charTree, int $position): array |
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{ |
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if ($position < 0) { |
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throw new InvalidArgumentException('Position must be non-negative.'); |
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} |
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// When PHP 7.1 is no longer supported, change to using spl_object_id. |
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$hash = spl_object_hash($charTree).';'.$position; |
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if (!isset(self::$memoization[$hash])) { |
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self::$memoization[$hash] = $this->cutInternal($charTree, $position); |
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} |
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return self::$memoization[$hash]; |
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} |
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/** |
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* @param CharTree $charTree Character tree to cut. |
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* @param int $position Number of characters before cut. |
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* @return (string|CharTree)[][] Cut variants of the character tree. Memoization is not used. |
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*/ |
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private function cutInternal(CharTree $charTree, int $position): array |
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{ |
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$root = $charTree->getRoot(); |
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if ($root === null) { |
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return []; |
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} |
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$rootLength = mb_strlen($root); |
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$branchPosition = $position-$rootLength; |
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if ($branchPosition < 0) { |
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return [['', $charTree]]; |
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} |
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if ($branchPosition === 0) { |
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return [[$root, CharTree::fromArray($charTree->getBranches())]]; |
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} |
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$cutCharTrees = []; |
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foreach ($charTree->getBranches() as $branch) { |
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foreach ($this->cut($branch, $branchPosition) as [$branchRoot, $branchTree]) { |
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assert(is_string($branchRoot)); |
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assert(is_object($branchTree)); |
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$cutCharTrees[] = [$root.$branchRoot, $branchTree]; |
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} |
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} |
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return $cutCharTrees; |
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} |
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} |
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Stadly /
PasswordPolice
