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<?php |
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/** |
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* This file is part of Railt package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Railt\SDL\Compiler; |
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/** |
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* Class Pipeline |
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*/ |
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class Pipeline implements \IteratorAggregate, \Countable |
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{ |
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/** |
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* @var int |
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*/ |
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public const PRIORITY_DEFINITION = 0x01; |
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/** |
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* @var int |
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*/ |
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public const PRIORITY_EXTENSION = 0x02; |
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/** |
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* @var int |
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*/ |
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public const PRIORITY_INVOCATION = 0x03; |
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/** |
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* Example struct: |
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* |
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* <code> |
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* [ |
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* PRIORITY_1 => \SplQueue([1, 2, 3]), |
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* PRIORITY_2 => \SplQueue([1, 2, 3]), |
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* PRIORITY_3 => \SplQueue([1, 2, 3]), |
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* ] |
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* </code> |
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* |
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* @var \SplQueue[] |
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*/ |
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private $queue = []; |
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/** |
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* @return \Traversable|callable[] |
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*/ |
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public function getIterator(): \Traversable |
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{ |
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while ($next = $this->next()) { |
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yield $next; |
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} |
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} |
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/** |
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* @return null|callable |
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*/ |
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private function next(): ?callable |
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{ |
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foreach ($this->queue as $queue) { |
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if ($queue->count() > 0) { |
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return $queue->shift(); |
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} |
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} |
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return null; |
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} |
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/** |
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* @param int $priority |
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* @param callable $then |
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*/ |
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public function push(int $priority, callable $then): void |
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{ |
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if (! \array_key_exists($priority, $this->queue)) { |
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$this->queue[$priority] = $this->createList(); |
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} |
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$this->queue[$priority]->push($then); |
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} |
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/** |
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* @return \SplDoublyLinkedList |
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*/ |
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protected function createList(): \SplDoublyLinkedList |
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{ |
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return new \SplQueue(); |
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} |
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/** |
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* @return int |
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*/ |
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public function count(): int |
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{ |
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return (int)\array_reduce($this->queue, function (int $result, \SplQueue $queue): int { |
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return $result + $queue->count(); |
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}, 0); |
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} |
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/** |
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* @return callable |
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* @throws \UnderflowException |
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*/ |
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public function pop(): callable |
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{ |
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$result = $this->next(); |
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if ($result === null) { |
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throw new \UnderflowException('Can not fetch data from empty heap'); |
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} |
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return $result; |
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} |
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} |
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railt /
sdl
