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<?php
declare(strict_types=1);
namespace League\HTMLToMarkdown\Converter;
use League\HTMLToMarkdown\Configuration;
use League\HTMLToMarkdown\ConfigurationAwareInterface;
use League\HTMLToMarkdown\ElementInterface;
class LinkConverter implements ConverterInterface, ConfigurationAwareInterface
{
/** @var Configuration */
protected $config;
public function setConfig(Configuration $config): void
{
$this->config = $config;
}
public function convert(ElementInterface $element): string
{
$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 = '<' . $text . '>';
} else {
if (\stristr($href, ' ')) {
$href = '<' . $href . '>';
}
$markdown = '[' . $text . '](' . $href . ')';
}
if (! $href) {
if ($this->shouldStrip()) {
$markdown = $text;
} else {
$markdown = \html_entity_decode($element->getChildrenAsString());
}
}
return $markdown;
}
/**
* @return string[]
*/
public function getSupportedTags(): array
{
return ['a'];
}
private function isValidAutolink(string $href): bool
{
$useAutolinks = $this->config->getOption('use_autolinks');
return $useAutolinks && (\preg_match('/^[A-Za-z][A-Za-z0-9.+-]{1,31}:[^<>\x00-\x20]*/i', $href) === 1);
}
private function isValidEmail(string $email): bool
{
// Email validation is messy business, but this should cover most cases
return \filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
}
private function shouldStrip(): bool
{
return $this->config->getOption('strip_placeholder_links') ?? false;
}
}
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