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<?php |
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declare(strict_types=1); |
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namespace Serializor; |
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use WeakMap; |
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/** |
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* Stasis for WeakMap objects. |
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* Keys are weakly referenced - entries with keys not strongly referenced |
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* elsewhere are excluded during unserialization. |
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*/ |
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final class WeakMapStasis extends Stasis |
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{ |
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private array $keys = []; |
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private array $values = []; |
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private array $dead = []; |
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private function __construct() {} |
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public function __serialize(): array |
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{ |
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$data = ['k' => $this->keys, 'v' => $this->values]; |
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// Only include dead array if there are dead entries |
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$hasDead = false; |
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foreach ($this->dead as $isDead) { |
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if ($isDead) { |
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$hasDead = true; |
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break; |
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} |
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} |
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if ($hasDead) { |
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$data['d'] = $this->dead; |
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} |
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return $data; |
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} |
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public function __unserialize(array $data): void |
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{ |
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$this->keys = $data['k']; |
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$this->values = $data['v']; |
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$this->dead = $data['d'] ?? array_fill(0, count($this->keys), false); |
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} |
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public function getClassName(): string |
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{ |
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return WeakMap::class; |
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} |
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public static function fromWeakMap(WeakMap $value): WeakMapStasis |
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{ |
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$frozen = new WeakMapStasis(); |
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foreach ($value as $obj => $data) { |
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$frozen->keys[] = $obj; |
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$frozen->values[] = $data; |
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} |
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$frozen->dead = array_fill(0, count($frozen->keys), false); |
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return $frozen; |
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} |
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/** |
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* Mark an entry as dead by its key's object ID. |
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*/ |
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public function markDeadByIndex(int $index): void |
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{ |
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$this->dead[$index] = true; |
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} |
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/** |
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* Get the keys for strong reference tracking. |
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*/ |
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public function &getKeys(): array |
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{ |
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return $this->keys; |
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} |
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/** |
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* Get the values for transformation. |
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*/ |
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public function &getValues(): array |
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{ |
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return $this->values; |
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} |
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/** |
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* Get the dead flags array. |
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*/ |
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public function &getDead(): array |
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{ |
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return $this->dead; |
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} |
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public function &getInstance(): mixed |
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{ |
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if ($this->hasInstance()) { |
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return $this->getCachedInstance(); |
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} |
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$map = new WeakMap(); |
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for ($i = 0, $len = count($this->keys); $i < $len; $i++) { |
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// Skip entries marked as dead |
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if (!empty($this->dead[$i])) { |
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continue; |
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} |
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// Only add if key is a valid object |
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if (\is_object($this->keys[$i])) { |
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$map[$this->keys[$i]] = $this->values[$i]; |
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} |
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} |
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$this->setInstance($map); |
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return $map; |
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} |
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} |
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