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<?php
declare(strict_types=1);
namespace League\HTMLToMarkdown\Converter;
use League\HTMLToMarkdown\ElementInterface;
class PreformattedConverter implements ConverterInterface
{
public function convert(ElementInterface $element): string
{
$preContent = \html_entity_decode($element->getChildrenAsString());
$preContent = \str_replace(['<pre>', '</pre>'], '', $preContent);
/*
* Checking for the code tag.
* Usually pre tags are used along with code tags. This conditional will check for already converted code tags,
* which use backticks, and if those backticks are at the beginning and at the end of the string it means
* there's no more information to convert.
*/
$firstBacktick = \strpos(\trim($preContent), '`');
$lastBacktick = \strrpos(\trim($preContent), '`');
if ($firstBacktick === 0 && $lastBacktick === \strlen(\trim($preContent)) - 1) {
return $preContent . "\n\n";
}
// If the execution reaches this point it means it's just a pre tag, with no code tag nested
// Empty lines are a special case
if ($preContent === '') {
return "```\n```\n\n";
}
// Normalizing new lines
$preContent = \preg_replace('/\r\n|\r|\n/', "\n", $preContent);
\assert(\is_string($preContent));
// Ensure there's a newline at the end
if (\strrpos($preContent, "\n") !== \strlen($preContent) - \strlen("\n")) {
$preContent .= "\n";
}
// Use three backticks
return "```\n" . $preContent . "```\n\n";
}
/**
* @return string[]
*/
public function getSupportedTags(): array
{
return ['pre'];
}
}
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