晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Form;

use Symfony\Component\Form\Exception\UnexpectedTypeException;

class FormFactory implements FormFactoryInterface
{
    /**
     * @var FormRegistryInterface
     */
    private $registry;

    /**
     * @var ResolvedFormTypeFactoryInterface
     */
    private $resolvedTypeFactory;

    public function __construct(FormRegistryInterface $registry, ResolvedFormTypeFactoryInterface $resolvedTypeFactory)
    {
        $this->registry = $registry;
        $this->resolvedTypeFactory = $resolvedTypeFactory;
    }

    /**
     * {@inheritdoc}
     */
    public function create($type = 'form', $data = null, array $options = array())
    {
        return $this->createBuilder($type, $data, $options)->getForm();
    }

    /**
     * {@inheritdoc}
     */
    public function createNamed($name, $type = 'form', $data = null, array $options = array())
    {
        return $this->createNamedBuilder($name, $type, $data, $options)->getForm();
    }

    /**
     * {@inheritdoc}
     */
    public function createForProperty($class, $property, $data = null, array $options = array())
    {
        return $this->createBuilderForProperty($class, $property, $data, $options)->getForm();
    }

    /**
     * {@inheritdoc}
     */
    public function createBuilder($type = 'form', $data = null, array $options = array())
    {
        $name = $type instanceof FormTypeInterface || $type instanceof ResolvedFormTypeInterface
            ? $type->getName()
            : $type;

        return $this->createNamedBuilder($name, $type, $data, $options);
    }

    /**
     * {@inheritdoc}
     */
    public function createNamedBuilder($name, $type = 'form', $data = null, array $options = array())
    {
        if (null !== $data && !array_key_exists('data', $options)) {
            $options['data'] = $data;
        }

        if ($type instanceof FormTypeInterface) {
            $type = $this->resolveType($type);
        } elseif (is_string($type)) {
            $type = $this->registry->getType($type);
        } elseif (!$type instanceof ResolvedFormTypeInterface) {
            throw new UnexpectedTypeException($type, 'string, Symfony\Component\Form\ResolvedFormTypeInterface or Symfony\Component\Form\FormTypeInterface');
        }

        $builder = $type->createBuilder($this, $name, $options);

        // Explicitly call buildForm() in order to be able to override either
        // createBuilder() or buildForm() in the resolved form type
        $type->buildForm($builder, $builder->getOptions());

        return $builder;
    }

    /**
     * {@inheritdoc}
     */
    public function createBuilderForProperty($class, $property, $data = null, array $options = array())
    {
        if (null === $guesser = $this->registry->getTypeGuesser()) {
            return $this->createNamedBuilder($property, 'text', $data, $options);
        }

        $typeGuess = $guesser->guessType($class, $property);
        $maxLengthGuess = $guesser->guessMaxLength($class, $property);
        $requiredGuess = $guesser->guessRequired($class, $property);
        $patternGuess = $guesser->guessPattern($class, $property);

        $type = $typeGuess ? $typeGuess->getType() : 'text';

        $maxLength = $maxLengthGuess ? $maxLengthGuess->getValue() : null;
        $pattern   = $patternGuess ? $patternGuess->getValue() : null;

        if (null !== $pattern) {
            $options = array_merge(array('pattern' => $pattern), $options);
        }

        if (null !== $maxLength) {
            $options = array_merge(array('max_length' => $maxLength), $options);
        }

        if ($requiredGuess) {
            $options = array_merge(array('required' => $requiredGuess->getValue()), $options);
        }

        // user options may override guessed options
        if ($typeGuess) {
            $options = array_merge($typeGuess->getOptions(), $options);
        }

        return $this->createNamedBuilder($property, $type, $data, $options);
    }

    /**
     * Wraps a type into a ResolvedFormTypeInterface implementation and connects
     * it with its parent type.
     *
     * @param FormTypeInterface $type The type to resolve.
     *
     * @return ResolvedFormTypeInterface The resolved type.
     */
    private function resolveType(FormTypeInterface $type)
    {
        $parentType = $type->getParent();

        if ($parentType instanceof FormTypeInterface) {
            $parentType = $this->resolveType($parentType);
        } elseif (null !== $parentType) {
            $parentType = $this->registry->getType($parentType);
        }

        return $this->resolvedTypeFactory->createResolvedType(
            $type,
            // Type extensions are not supported for unregistered type instances,
            // i.e. type instances that are passed to the FormFactory directly,
            // nor for their parents, if getParent() also returns a type instance.
            array(),
            $parentType
        );
    }
}