Symplify\PHP7_Sculpin\MarkdownBundle\MarkdownConverter

Complexity

Total Complexity

3

Size/Duplication

Total Lines	69
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	2

Test Coverage

Coverage

0%

Importance

Changes

0

3 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	5	1
A	convert()	0	8	1
B	generateHeaderId()	0	35	1

<?php

/*
 * This file is a part of Sculpin.
 *
 * (c) Dragonfly Development Inc.
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symplify\PHP7_Sculpin\MarkdownBundle;

use Michelf\MarkdownExtra;
use Symplify\PHP7_Sculpin\Converter\SourceConverterContext;
use Symplify\PHP7_Sculpin\Converter\ConverterInterface;

final class MarkdownConverter implements ConverterInterface
{
    /**
     * @var string
     */
    const NAME = 'markdown';

    /**
     * @var MarkdownExtra
     */
    private $markdown;

    public function __construct(MarkdownExtra $markdown)
    {
        $this->markdown = $markdown;
        $this->markdown->header_id_func = [$this, 'generateHeaderId'];
    }

    /**
     * {@inheritdoc}
     */
    public function convert(SourceConverterContext $converterContext)
    {
        $converterContext->setContent(
            $this->markdown->transform(
                $converterContext->content()
            )
        );
    }

    /**
     * This method is called to generate an id="" attribute for a header.
     */
    public function generateHeaderId(string $headerText) : string
    {
        // $headerText is completely raw markdown input. We need to strip it
        // from all markup, because we are only interested in the actual 'text'
        // part of it.

        // Step 1: Remove html tags.
        $result = strip_tags($headerText);

        // Step 2: Remove all markdown links. To do this, we simply remove
        // everything between ( and ) if the ( occurs right after a ].
        $result = preg_replace('%
            (?<= \\]) # Look behind to find ]
            (
                \\(     # match (
                [^\\)]* # match everything except )
                \\)     # match )
            )

            %x', '', $result);

        // Step 3: Convert spaces to dashes, and remove unwanted special
        // characters.
        $map = [
            ' ' => '-',
            '(' => '',
            ')' => '',
            '[' => '',
            ']' => '',
        ];

        return rawurlencode(strtolower(
            strtr($result, $map)
        ));
    }
}