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<?php
declare(strict_types=1);
namespace League\HTMLToMarkdown\Converter;
use League\HTMLToMarkdown\ElementInterface;
class CodeConverter implements ConverterInterface
{
public function convert(ElementInterface $element): string
{
$language = '';
// Checking for language class on the code block
$classes = $element->getAttribute('class');
if ($classes) {
// Since tags can have more than one class, we need to find the one that starts with 'language-'
$classes = \explode(' ', $classes);
foreach ($classes as $class) {
if (\strpos($class, 'language-') !== false) {
// Found one, save it as the selected language and stop looping over the classes.
$language = \str_replace('language-', '', $class);
break;
}
}
}
$markdown = '';
$code = \html_entity_decode($element->getChildrenAsString());
// In order to remove the code tags we need to search for them and, in the case of the opening tag
// use a regular expression to find the tag and the other attributes it might have
$code = \preg_replace('/<code\b[^>]*>/', '', $code);
\assert($code !== null);
$code = \str_replace('</code>', '', $code);
// Checking if it's a code block or span
if ($this->shouldBeBlock($element, $code)) {
// Code block detected, newlines will be added in parent
$markdown .= '```' . $language . "\n" . $code . "\n" . '```';
} else {
// One line of code, wrapping it on one backtick, removing new lines
$markdown .= '`' . \preg_replace('/\r\n|\r|\n/', '', $code) . '`';
}
return $markdown;
}
/**
* @return string[]
*/
public function getSupportedTags(): array
{
return ['code'];
}
private function shouldBeBlock(ElementInterface $element, string $code): bool
{
$parent = $element->getParent();
if ($parent !== null && $parent->getTagName() === 'pre') {
return true;
}
return \preg_match('/[^\s]` `/', $code) === 1;
}
}
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