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 Twig.
 *
 * (c) Fabien Potencier
 * (c) Armin Ronacher
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Twig\Node;

use Twig\Attribute\YieldReady;
use Twig\Compiler;
use Twig\Node\Expression\ReturnPrimitiveTypeInterface;
use Twig\Node\Expression\Test\TrueTest;
use Twig\TwigTest;

/**
 * Represents an if node.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
#[YieldReady]
class IfNode extends Node
{
    public function __construct(Node $tests, ?Node $else, int $lineno)
    {
        for ($i = 0, $count = \count($tests); $i < $count; $i += 2) {
            $test = $tests->getNode((string) $i);
            if (!$test instanceof ReturnPrimitiveTypeInterface) {
                $tests->setNode($i, new TrueTest($test, new TwigTest('true'), null, $test->getTemplateLine()));
            }
        }
        $nodes = ['tests' => $tests];
        if (null !== $else) {
            $nodes['else'] = $else;
        }

        parent::__construct($nodes, [], $lineno);
    }

    public function compile(Compiler $compiler): void
    {
        $compiler->addDebugInfo($this);
        for ($i = 0, $count = \count($this->getNode('tests')); $i < $count; $i += 2) {
            if ($i > 0) {
                $compiler
                    ->outdent()
                    ->write('} elseif (')
                ;
            } else {
                $compiler
                    ->write('if (')
                ;
            }

            $compiler
                ->subcompile($this->getNode('tests')->getNode((string) $i))
                ->raw(") {\n")
                ->indent()
            ;
            // The node might not exists if the content is empty
            if ($this->getNode('tests')->hasNode((string) ($i + 1))) {
                $compiler->subcompile($this->getNode('tests')->getNode((string) ($i + 1)));
            }
        }

        if ($this->hasNode('else')) {
            $compiler
                ->outdent()
                ->write("} else {\n")
                ->indent()
                ->subcompile($this->getNode('else'))
            ;
        }

        $compiler
            ->outdent()
            ->write("}\n");
    }
}