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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 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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thephpleague /
commonmark
