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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 Generator; |
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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\Value\NodeValueInterface; |
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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 InsertElementMutation implements MutationInterface |
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{ |
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private $value; |
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private $path; |
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private $elementIndex; |
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private $elementCounter = 0; |
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private $eventDecoder; |
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public function __construct(NodeValueInterface $value, PathInterface $path, int $elementIndex) |
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{ |
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$this->value = $value; |
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$this->path = $path; |
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$this->elementIndex = $elementIndex; |
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$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->parentPathMatches($event)) { |
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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 from $this->processBeforeElementEvent($event, $valueWalker); |
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break; |
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case $event instanceof AfterElementEventInterface: |
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yield from $this->processAfterElementEvent($event); |
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break; |
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default: |
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yield from $this->processElementValue($event, $valueWalker); |
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} |
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} |
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public function reset(): void |
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{ |
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$this->elementCounter = 0; |
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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->path); |
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} |
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private function processBeforeElementEvent( |
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BeforeElementEventInterface $event, |
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ValueWalkerInterface $valueWalker |
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): Generator { |
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if ($event->getIndex() < $this->elementIndex) { |
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yield $event; |
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return; |
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} |
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if ($event->getIndex() == $this->elementIndex) { |
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$elementPath = $this->path->copyWithElement($this->elementIndex); |
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yield new BeforeElementEvent($this->elementIndex, $elementPath); |
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yield from $valueWalker->createEventIterator($this->value, $elementPath); |
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yield new AfterElementEvent($this->elementIndex, $elementPath); |
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} |
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$shiftedIndex = $event->getIndex() + 1; |
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$path = $event |
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->getPath() |
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->copyParent() |
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->copyWithElement($shiftedIndex); |
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yield new BeforeElementEvent($shiftedIndex, $path); |
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} |
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private function processAfterElementEvent(AfterElementEventInterface $event): Generator |
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{ |
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$this->elementCounter++; |
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if ($event->getIndex() < $this->elementIndex) { |
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yield $event; |
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return; |
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} |
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$shiftedIndex = $event->getIndex() + 1; |
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$path = $event |
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->getPath() |
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->copyParent() |
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->copyWithElement($shiftedIndex); |
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yield new AfterElementEvent($shiftedIndex, $path); |
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} |
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private function processElementValue(EventInterface $event, ValueWalkerInterface $valueWalker): Generator |
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{ |
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$path = $event |
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->getPath() |
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->copyParent() |
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->copyWithElement($this->elementCounter + 1); |
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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([$event])), |
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$path, |
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); |
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} |
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} |
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remorhaz /
php-json-pointer
