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<?php
namespace League\HTMLToMarkdown\Converter;
use League\HTMLToMarkdown\ElementInterface;
class LinkConverter implements ConverterInterface
{
/**
* @param ElementInterface $element
*
* @return string
*/
public function convert(ElementInterface $element)
{
$href = $element->getAttribute('href');
$title = $element->getAttribute('title');
$text = trim($element->getValue(), "\t\n\r\0\x0B");
if ($title !== '') {
$markdown = '[' . $text . '](' . $href . ' "' . $title . '")';
} elseif ($href === $text && $this->isValidAutolink($href)) {
$markdown = '<' . $href . '>';
} elseif ($href === 'mailto:' . $text && $this->isValidEmail($text)) {
$markdown = '<' . $text . '>';
} else {
$markdown = '[' . $text . '](' . $href . ')';
}
if (!$href) {
$markdown = html_entity_decode($element->getChildrenAsString());
}
return $markdown;
}
/**
* @return string[]
*/
public function getSupportedTags()
{
return array('a');
}
/**
* @param string $href
*
* @return bool
*/
private function isValidAutolink($href)
{
return preg_match('/^[A-Za-z][A-Za-z0-9.+-]{1,31}:[^<>\x00-\x20]*/i', $href) === 1;
}
/**
* @param string $email
*
* @return bool
*/
private function isValidEmail($email)
{
// Email validation is messy business, but this should cover most cases
return filter_var($email, FILTER_VALIDATE_EMAIL);
}
}
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