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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\JSON\Data\Event; |
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use Generator; |
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use Remorhaz\JSON\Data\Path\PathInterface; |
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use Remorhaz\JSON\Data\Value\ArrayValueInterface; |
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use Remorhaz\JSON\Data\Value\NodeValueInterface; |
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use Remorhaz\JSON\Data\Value\ObjectValueInterface; |
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use Remorhaz\JSON\Data\Value\ScalarValueInterface; |
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final class EventGenerator |
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{ |
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private $stack; |
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private $path; |
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public function __construct(NodeValueInterface $value, PathInterface $path) |
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{ |
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$this->stack = [$value]; |
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$this->path = $path; |
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} |
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public function __invoke(): Generator |
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{ |
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while (true) { |
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if (empty($this->stack)) { |
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return; |
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} |
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$entity = array_pop($this->stack); |
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switch (true) { |
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case $entity instanceof EventInterface: |
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yield from $this->onEvent($entity); |
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break; |
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case $entity instanceof ScalarValueInterface: |
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yield from $this->onScalarValue($entity); |
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break; |
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case $entity instanceof ArrayValueInterface: |
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yield from $this->onArrayValue($entity); |
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break; |
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case $entity instanceof ObjectValueInterface: |
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yield from $this->onObjectValue($entity); |
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break; |
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default: |
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throw new Exception\UnexpectedEntityException($entity); |
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} |
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} |
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} |
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private function onEvent(EventInterface $event): Generator |
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{ |
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switch (true) { |
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case $event instanceof BeforeElementEventInterface: |
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$this->path = $this |
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->path |
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->copyWithElement($event->getIndex()); |
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break; |
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case $event instanceof BeforePropertyEventInterface: |
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$this->path = $this |
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->path |
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->copyWithProperty($event->getName()); |
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break; |
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case $event instanceof AfterElementEventInterface: |
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case $event instanceof AfterPropertyEventInterface: |
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$this->path = $this |
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->path |
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->copyParent(); |
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break; |
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} |
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yield $event; |
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} |
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private function onScalarValue(ScalarValueInterface $value): Generator |
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{ |
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yield new ScalarEvent($value->getData(), $this->path); |
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} |
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private function onArrayValue(ArrayValueInterface $value): Generator |
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{ |
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$localStack = []; |
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foreach ($value->createChildIterator() as $index => $child) { |
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$elementPath = $this |
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->path |
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->copyWithElement($index); |
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array_push( |
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$localStack, |
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new BeforeElementEvent($index, $elementPath), |
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$child, |
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new AfterElementEvent($index, $elementPath) |
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); |
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} |
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array_push( |
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$this->stack, |
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new AfterArrayEvent($this->path), |
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...array_reverse($localStack) |
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); |
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yield new BeforeArrayEvent($this->path); |
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} |
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private function onObjectValue(ObjectValueInterface $value): Generator |
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{ |
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$localStack = []; |
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foreach ($value->createChildIterator() as $name => $child) { |
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$elementPath = $this |
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->path |
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->copyWithProperty($name); |
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array_push( |
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$localStack, |
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new BeforePropertyEvent($name, $elementPath), |
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$child, |
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new AfterPropertyEvent($name, $elementPath) |
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); |
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} |
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array_push( |
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$this->stack, |
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new AfterObjectEvent($this->path), |
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...array_reverse($localStack) |
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); |
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yield new BeforeObjectEvent($this->path); |
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} |
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} |
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remorhaz /
php-json-data
