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<?php
declare(strict_types=1);
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
* - (c) John MacFarlane
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Extension\SmartPunct;
use League\CommonMark\Node\Inline\Text;
use League\CommonMark\Parser\Inline\InlineParserInterface;
use League\CommonMark\Parser\Inline\InlineParserMatch;
use League\CommonMark\Parser\InlineParserContext;
final class DashParser implements InlineParserInterface
{
private const EN_DASH = '–';
private const EM_DASH = '—';
public function getMatchDefinition(): InlineParserMatch
{
return InlineParserMatch::regex('(?<!-)(-{2,})');
}
public function parse(InlineParserContext $inlineContext): bool
{
$count = $inlineContext->getFullMatchLength();
$inlineContext->getCursor()->advanceBy($count);
$enCount = 0;
$emCount = 0;
if ($count % 3 === 0) { // If divisible by 3, use all em dashes
$emCount = (int) ($count / 3);
} elseif ($count % 2 === 0) { // If divisible by 2, use all en dashes
$enCount = (int) ($count / 2);
} elseif ($count % 3 === 2) { // If 2 extra dashes, use en dash for last 2; em dashes for rest
$emCount = (int) (($count - 2) / 3);
$enCount = 1;
} else { // Use en dashes for last 4 hyphens; em dashes for rest
$emCount = (int) (($count - 4) / 3);
$enCount = 2;
}
$inlineContext->getContainer()->appendChild(new Text(
\str_repeat(self::EM_DASH, $emCount) . \str_repeat(self::EN_DASH, $enCount)
));
return true;
}
}
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