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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 HeaderConverter implements ConverterInterface, ConfigurationAwareInterface
{
public const STYLE_ATX = 'atx';
public const STYLE_SETEXT = 'setext';
/** @var Configuration */
protected $config;
public function setConfig(Configuration $config): void
{
$this->config = $config;
}
public function convert(ElementInterface $element): string
{
$level = (int) \substr($element->getTagName(), 1, 1);
$style = $this->config->getOption('header_style', self::STYLE_SETEXT);
if (\strlen($element->getValue()) === 0) {
return "\n";
}
if (($level === 1 || $level === 2) && ! $element->isDescendantOf('blockquote') && $style === self::STYLE_SETEXT) {
return $this->createSetextHeader($level, $element->getValue());
}
return $this->createAtxHeader($level, $element->getValue());
}
/**
* @return string[]
*/
public function getSupportedTags(): array
{
return ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'];
}
private function createSetextHeader(int $level, string $content): string
{
$length = \function_exists('mb_strlen') ? \mb_strlen($content, 'utf-8') : \strlen($content);
$underline = $level === 1 ? '=' : '-';
return $content . "\n" . \str_repeat($underline, $length) . "\n\n";
}
private function createAtxHeader(int $level, string $content): string
{
$prefix = \str_repeat('#', $level) . ' ';
return $prefix . $content . "\n\n";
}
}
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