EntityFormBuilder

EntityFormBuilder.php

<?php

namespace VS\UI;

/**
 * Simple form generator for plain old data objects.
 * 
 * Creates a field for each scalar setter. Nothing more.
 * 
 * @author Václav Šír
 */
class EntityFormBuilder extends \Nette\Object
{
	/**
	 * @param \Nette\Forms\Form $form
	 * @param object $entity 
	 */
	public function build(\Nette\Forms\Form $form, $entity)
	{
		$classType = \Nette\Reflection\ClassType::from($entity);
		$methods = $classType->getMethods(\ReflectionMethod::IS_PUBLIC);
		$fieldNames = array();
		foreach ($methods as $method) {
			if ($this->isSuitableSetter($method)) {
				
				// Field creation
				
				$fieldName = substr($method->name, 3);
				$type = $this->getFirstParameterType($method);
				$caption = "$fieldName: ";
				switch ($type) {
					case 'bool':
					case 'boolean':
						$form->addCheckbox($fieldName, $caption);
						break;
					default:
						$form->addTextArea($fieldName, $caption, 40, 3);
						break;
				}
				$fieldNames[] = $fieldName;
				
				// Assign default value
				
				$getterName = 'get' . $fieldName;
				$defaultValue = $classType->hasMethod($getterName)
						? $classType->getMethod($getterName)->invoke($entity)
						: null;
				$form[$fieldName]->setDefaultValue($defaultValue);
			}
		}
		
		$form->onSuccess[] = new EntityFormBuilder_OnSuccessCallback($entity, $fieldNames);
	}
	
	private function isSuitableSetter(\Nette\Reflection\Method $method)
	{
			$parameters = $method->getParameters();
			$typeOfTheParameter = $this->getFirstParameterType($method);
			return substr($method->name, 0, 3) === 'set'
					&& count($parameters) === 1
					&& $parameters[0]->getClass() === null
					&& $typeOfTheParameter !== 'array'
					&& $typeOfTheParameter !== 'object'
					&& !\Nette\Utils\Strings::endsWith($typeOfTheParameter, '[]')
					&& !class_exists($typeOfTheParameter);
	}
	
	private function getFirstParameterType(\Nette\Reflection\Method $method)
	{
		$parameters = $method->getParameters();
		if (empty($parameters)) { return null; }
		if ($typehintedClass = $parameters[0]->getClassName()) { return $typehintedClass; }
		if ($parameters[0]->isArray()) { return 'array'; }
		if ($annotation = $method->getAnnotation('param')) {
				$splits = preg_split('~[|\s]+~', $annotation, 2);
				return array_shift($splits);
		}
		return 'mixed';
	}
}

EntityFormBuilder_OnSuccessCallback.php

<?php

namespace VS\UI;

/**
 * @author Václav Šír
 */
class EntityFormBuilder_OnSuccessCallback extends \Nette\Object
{
	private $entity;
	private $fieldNames;
	
	public function __construct($entity, $fieldNames)
	{
		$this->entity = $entity;
		$this->fieldNames = $fieldNames;
	}
	
	public function __invoke(\Nette\Forms\Form $form)
	{
		$values = $form->getValues();
		foreach ($this->fieldNames as $fieldName) {
			$setterName = "set$fieldName";
			try {
				$this->entity->$setterName($values[$fieldName]);
			} catch (\Exception $e) {
				$form[$fieldName]->addError(get_class($e) . ': ' . $e->getMessage());
			}
		}
	}
}