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by Colin
01:59
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src/Extension/SmartPunct/PunctuationParser.php (1 issue)

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<?php
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declare(strict_types=1);
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/*
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 * This file is part of the league/commonmark package.
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 *
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 * (c) Colin O'Dell <[email protected]>
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 *
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 * Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
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 *  - (c) John MacFarlane
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace League\CommonMark\Extension\SmartPunct;
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use League\CommonMark\Node\Inline\Text;
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use League\CommonMark\Parser\Inline\InlineParserInterface;
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use League\CommonMark\Parser\Inline\InlineParserMatch;
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use League\CommonMark\Parser\InlineParserContext;
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final class PunctuationParser implements InlineParserInterface
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{
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    public function getMatchDefinition(): InlineParserMatch
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    {
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        return InlineParserMatch::oneOf('-', '.');
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    }
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    public function parse(InlineParserContext $inlineContext): bool
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    {
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        $char   = $inlineContext->getFullMatch();
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        $cursor = $inlineContext->getCursor();
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        // Ellipses
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        if ($char === '.' && $matched = $cursor->match('/^\\.( ?\\.)\\1/')) {
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            $inlineContext->getContainer()->appendChild(new Text('…'));
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            return true;
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        }
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        // Em/En-dashes
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        if ($char === '-' && $matched = $cursor->match('/^(?<!-)(-{2,})/')) {
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            $count   = \strlen($matched);
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            $enDash  = '–';
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            $enCount = 0;
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            $emDash  = '—';
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            $emCount = 0;
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            if ($count % 3 === 0) { // If divisible by 3, use all em dashes
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                $emCount = (int) ($count / 3);
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            } elseif ($count % 2 === 0) { // If divisible by 2, use all en dashes
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                $enCount = (int) ($count / 2);
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            } elseif ($count % 3 === 2) { // If 2 extra dashes, use en dash for last 2; em dashes for rest
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                $emCount = (int) (($count - 2) / 3);
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                $enCount = 1;
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            } else { // Use en dashes for last 4 hyphens; em dashes for rest
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                $emCount = (int) (($count - 4) / 3);
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                $enCount = 2;
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            }
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            $inlineContext->getContainer()->appendChild(new Text(
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                \str_repeat($emDash, $emCount) . \str_repeat($enDash, $enCount)
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            ));
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            return true;
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        }
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        return false;
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    }
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}
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