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<?php |
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namespace Bdf\Form\Util; |
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use Bdf\Form\ElementBuilderInterface; |
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use Bdf\Form\Registry\RegistryInterface; |
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use Bdf\Form\Transformer\NullTransformer; |
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use Bdf\Form\Transformer\TransformerAggregate; |
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use Bdf\Form\Transformer\TransformerInterface; |
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/** |
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* Trait for implements builder of transformer |
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*/ |
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trait TransformerBuilderTrait |
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{ |
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/** |
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* @var array |
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*/ |
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private $transformers = []; |
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/** |
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* @var callable[] |
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*/ |
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private $transformerProviders = []; |
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/** |
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* {@inheritdoc} |
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* |
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* @see ElementBuilderInterface::transformer() |
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*/ |
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final public function transformer($transformer, bool $append = true) |
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{ |
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if ($append === true) { |
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$this->transformers[] = $transformer; |
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} else { |
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array_unshift($this->transformers, $transformer); |
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} |
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return $this; |
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} |
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/** |
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* Add a new transformer provider |
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* The transformer provider permit to create a transformer during the build of the element transformer |
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* So the transformer can be configured by the element builder |
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* |
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* Usage: |
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* <code> |
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* $this->addTransformerProvider(function (RegistryInterface $registry) { |
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* if ($this->enableTransformer) { |
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* return [new MyTransformer($this->transformerOptions)]; |
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* } |
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* |
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* return []; |
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* }); |
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* </code> |
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* |
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* @param callable(RegistryInterface):TransformerInterface[] $provider |
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*/ |
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final protected function addTransformerProvider(callable $provider): void |
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{ |
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$this->transformerProviders[] = $provider; |
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} |
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/** |
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* Get the registry instance |
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* |
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* @return RegistryInterface |
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*/ |
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abstract protected function registry(): RegistryInterface; |
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/** |
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* Create the transformer for the element |
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* |
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* @return TransformerInterface |
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*/ |
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private function buildTransformer(): TransformerInterface |
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{ |
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$providedTransformers = []; |
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foreach ($this->transformerProviders as $provider) { |
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$providedTransformers = array_merge($providedTransformers, $provider($this->registry())); |
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} |
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$transformers = array_map([$this->registry(), 'transformer'], $this->transformers); |
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if (!empty($providedTransformers)) { |
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$transformers = array_merge($providedTransformers, $transformers); |
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} |
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switch (count($transformers)) { |
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case 0: |
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return NullTransformer::instance(); |
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case 1: |
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return $transformers[0]; |
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default: |
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return new TransformerAggregate($transformers); |
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} |
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} |
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} |
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b2pweb /
bdf-form
