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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\JSON\Pointer\Processor\Mutator; |
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use ArrayIterator; |
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use Iterator; |
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use Remorhaz\JSON\Data\Event\AfterElementEvent; |
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use Remorhaz\JSON\Data\Event\AfterElementEventInterface; |
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use Remorhaz\JSON\Data\Event\BeforeElementEvent; |
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use Remorhaz\JSON\Data\Event\BeforeElementEventInterface; |
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use Remorhaz\JSON\Data\Event\EventInterface; |
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use Remorhaz\JSON\Data\Export\EventDecoder; |
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use Remorhaz\JSON\Data\Path\PathInterface; |
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use Remorhaz\JSON\Data\Walker\MutationInterface; |
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use Remorhaz\JSON\Data\Walker\ValueWalkerInterface; |
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final class DeleteElementMutation implements MutationInterface |
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{ |
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private $arrayPath; |
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private $elementPath; |
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private $elementIndex; |
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private $elementCounter; |
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private $eventDecoder; |
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public function __construct(PathInterface $arrayPath, PathInterface $elementPath) |
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{ |
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$this->arrayPath = $arrayPath; |
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$this->elementPath = $elementPath; |
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$this->eventDecoder = new EventDecoder; |
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} |
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public function __invoke(EventInterface $event, ValueWalkerInterface $valueWalker): Iterator |
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{ |
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if ($this->elementPath->equals($event->getPath())) { |
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if ($event instanceof AfterElementEventInterface) { |
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$this->elementCounter = $event->getIndex(); |
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} |
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} |
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if ($this->elementPath->contains($event->getPath())) { |
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return; |
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} |
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if (!$this->parentPathMatches($event)) { |
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yield $event; |
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return; |
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} |
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if (!isset($this->elementCounter)) { |
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yield $event; |
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return; |
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} |
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switch (true) { |
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case $event instanceof BeforeElementEventInterface: |
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yield new BeforeElementEvent( |
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$this->elementCounter, |
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$this |
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->arrayPath |
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->copyWithElement($this->elementCounter) |
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); |
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return; |
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case $event instanceof AfterElementEventInterface: |
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yield new AfterElementEvent( |
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$this->elementCounter, |
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$this |
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->arrayPath |
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->copyWithElement($this->elementCounter) |
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); |
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$this->elementCounter++; |
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return; |
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default: |
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yield from $valueWalker->createEventIterator( |
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$this |
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->eventDecoder |
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->exportExistingEvents(new ArrayIterator([$event])), |
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$this |
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->arrayPath |
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->copyWithElement($this->elementCounter) |
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); |
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} |
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return; |
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} |
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public function reset(): void |
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{ |
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unset($this->elementIndex, $this->elementCounter); |
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} |
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private function parentPathMatches(EventInterface $event): bool |
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{ |
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$pathElements = $event->getPath()->getElements(); |
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if (empty($pathElements)) { |
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return false; |
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} |
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return $event |
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->getPath() |
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->copyParent() |
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->equals($this->arrayPath); |
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} |
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} |
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remorhaz /
php-json-pointer
