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<?php |
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declare(strict_types=1); |
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namespace Stadly\PasswordPolice\Formatter; |
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use InvalidArgumentException; |
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use Stadly\PasswordPolice\CharTree; |
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use Stadly\PasswordPolice\Formatter; |
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final class Truncator implements Formatter |
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{ |
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use Chaining; |
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/** |
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* @var int Maximum string length. |
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*/ |
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private $length; |
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/** |
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* @var CharTree[] Memoization for already truncated character trees. |
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*/ |
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private $truncateMemoization = []; |
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/** |
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* @param int $length Maximum string length. |
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*/ |
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public function __construct(int $length) |
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{ |
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if ($length < 0) { |
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throw new InvalidArgumentException('Length must be non-negative.'); |
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} |
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$this->length = $length; |
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} |
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/** |
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* @param CharTree $charTree Character tree to format. |
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* @return CharTree Truncated variant of the character tree. |
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*/ |
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protected function applyCurrent(CharTree $charTree): CharTree |
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{ |
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return $this->applyInternal($charTree, $this->length); |
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} |
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/** |
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* @param CharTree $charTree Character tree to format. |
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* @param int $length Maximum string length. |
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* @return CharTree Truncated variant of the character tree. |
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*/ |
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private function applyInternal(CharTree $charTree, int $length): CharTree |
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{ |
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// When PHP 7.1 is no longer supported, change to using spl_object_id. |
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$hash = spl_object_hash($charTree).';'.$length; |
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if (!isset($this->truncateMemoization[$hash])) { |
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$this->truncateMemoization[$hash] = $this->truncate($charTree, $length); |
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} |
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return $this->truncateMemoization[$hash]; |
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} |
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/** |
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* @param CharTree $charTree Character tree to format. |
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* @param int $length Maximum string length. |
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* @return CharTree Truncated variant of the character tree. Memoization is not used. |
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*/ |
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private function truncate(CharTree $charTree, int $length): CharTree |
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{ |
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$root = $charTree->getRoot(); |
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if ($root === null) { |
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return $charTree; |
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} |
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$rootLength = mb_strlen($root); |
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$branchLength = $length-$rootLength; |
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if ($branchLength < 0) { |
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return CharTree::fromString(''); |
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} |
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$truncatedBranches = []; |
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foreach ($charTree->getBranches() as $branch) { |
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$truncatedBranches[] = $this->applyInternal($branch, $branchLength); |
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} |
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return CharTree::fromString($root, $truncatedBranches); |
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} |
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} |
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Stadly /
PasswordPolice
