<?php

/**
 * @package    Grav\Common\Twig
 *
 * @copyright  Copyright (C) 2015 - 2020 Trilby Media, LLC. All rights reserved.
 * @license    MIT License; see LICENSE file for details.
 */

namespace Grav\Common\Twig\Node;

use Twig\Compiler;
use Twig\Node\Node;
use Twig\Node\NodeOutputInterface;

/**
 * Class TwigNodeMarkdown
 * @package Grav\Common\Twig\Node
 */
class TwigNodeMarkdown extends Node implements NodeOutputInterface
{
    /**
     * TwigNodeMarkdown constructor.
     * @param Node $body
     * @param int $lineno
     * @param string $tag
     */
    public function __construct(Node $body, $lineno, $tag = 'markdown')
    {
        parent::__construct(['body' => $body], [], $lineno, $tag);
    }

    /**
     * Compiles the node to PHP.
     *
     * @param Compiler $compiler A Twig Compiler instance
     * @return void
     */
    public function compile(Compiler $compiler): void
    {
        $compiler
            ->addDebugInfo($this)
            ->write('ob_start();' . PHP_EOL)
            ->subcompile($this->getNode('body'))
            ->write('$content = ob_get_clean();' . PHP_EOL)
            ->write('preg_match("/^\s*/", $content, $matches);' . PHP_EOL)
            ->write('$lines = explode("\n", $content);' . PHP_EOL)
            ->write('$content = preg_replace(\'/^\' . $matches[0]. \'/\', "", $lines);' . PHP_EOL)
            ->write('$content = join("\n", $content);' . PHP_EOL)
            ->write('echo $this->env->getExtension(\'Grav\Common\Twig\TwigExtension\')->markdownFunction($context, $content);' . PHP_EOL);
    }
}
