BookStack/app/Entities/Tools/Markdown/CheckboxConverter.php

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<?php
namespace BookStack\Entities\Tools\Markdown;
use League\HTMLToMarkdown\Converter\ConverterInterface;
use League\HTMLToMarkdown\ElementInterface;
class CheckboxConverter implements ConverterInterface
{
public function convert(ElementInterface $element): string
{
if (strtolower($element->getAttribute('type')) === 'checkbox') {
$isChecked = $element->getAttribute('checked') === 'checked';
return $isChecked ? ' [x] ' : ' [ ] ';
}
return $element->getValue();
}
/**
* @return string[]
*/
public function getSupportedTags(): array
{
return ['input'];
}
}