60 lines
1.9 KiB
PHP
60 lines
1.9 KiB
PHP
<?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 <colinodell@gmail.com>
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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 DashParser implements InlineParserInterface
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{
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private const EN_DASH = '–';
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private const EM_DASH = '—';
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public function getMatchDefinition(): InlineParserMatch
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{
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return InlineParserMatch::regex('(?<!-)(-{2,})');
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}
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public function parse(InlineParserContext $inlineContext): bool
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{
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$count = $inlineContext->getFullMatchLength();
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$inlineContext->getCursor()->advanceBy($count);
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$enCount = 0;
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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(self::EM_DASH, $emCount) . \str_repeat(self::EN_DASH, $enCount)
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));
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return true;
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}
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}
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