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;

/**
 * The default implementation of FormFactoryBuilderInterface.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
class FormFactoryBuilder implements FormFactoryBuilderInterface
{
    /**
     * @var ResolvedFormTypeFactoryInterface
     */
    private $resolvedTypeFactory;

    /**
     * @var array
     */
    private $extensions = array();

    /**
     * @var array
     */
    private $types = array();

    /**
     * @var array
     */
    private $typeExtensions = array();

    /**
     * @var array
     */
    private $typeGuessers = array();

    /**
     * {@inheritdoc}
     */
    public function setResolvedTypeFactory(ResolvedFormTypeFactoryInterface $resolvedTypeFactory)
    {
        $this->resolvedTypeFactory = $resolvedTypeFactory;

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addExtension(FormExtensionInterface $extension)
    {
        $this->extensions[] = $extension;

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addExtensions(array $extensions)
    {
        $this->extensions = array_merge($this->extensions, $extensions);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addType(FormTypeInterface $type)
    {
        $this->types[$type->getName()] = $type;

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addTypes(array $types)
    {
        foreach ($types as $type) {
            $this->types[$type->getName()] = $type;
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addTypeExtension(FormTypeExtensionInterface $typeExtension)
    {
        $this->typeExtensions[$typeExtension->getExtendedType()][] = $typeExtension;

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addTypeExtensions(array $typeExtensions)
    {
        foreach ($typeExtensions as $typeExtension) {
            $this->typeExtensions[$typeExtension->getExtendedType()][] = $typeExtension;
        }

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addTypeGuesser(FormTypeGuesserInterface $typeGuesser)
    {
        $this->typeGuessers[] = $typeGuesser;

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function addTypeGuessers(array $typeGuessers)
    {
        $this->typeGuessers = array_merge($this->typeGuessers, $typeGuessers);

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function getFormFactory()
    {
        $extensions = $this->extensions;

        if (count($this->types) > 0 || count($this->typeExtensions) > 0 || count($this->typeGuessers) > 0) {
            if (count($this->typeGuessers) > 1) {
                $typeGuesser = new FormTypeGuesserChain($this->typeGuessers);
            } else {
                $typeGuesser = isset($this->typeGuessers[0]) ? $this->typeGuessers[0] : null;
            }

            $extensions[] = new PreloadedExtension($this->types, $this->typeExtensions, $typeGuesser);
        }

        $resolvedTypeFactory = $this->resolvedTypeFactory ?: new ResolvedFormTypeFactory();
        $registry = new FormRegistry($extensions, $resolvedTypeFactory);

        return new FormFactory($registry, $resolvedTypeFactory);
    }
}