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<?php
namespace League\HTMLToMarkdown\Converter;
use League\HTMLToMarkdown\Configuration;
use League\HTMLToMarkdown\ConfigurationAwareInterface;
use League\HTMLToMarkdown\ElementInterface;
class HeaderConverter implements ConverterInterface, ConfigurationAwareInterface
{
const STYLE_ATX = 'atx';
const STYLE_SETEXT = 'setext';
/**
* @var Configuration
*/
protected $config;
/**
* @param Configuration $config
*/
public function setConfig(Configuration $config)
{
$this->config = $config;
}
/**
* @param ElementInterface $element
*
* @return string
*/
public function convert(ElementInterface $element)
{
$level = (int) substr($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()
{
return array('h1', 'h2', 'h3', 'h4', 'h5', 'h6');
}
/**
* @param int $level
* @param string $content
*
* @return string
*/
private function createSetextHeader($level, $content)
{
$length = function_exists('mb_strlen') ? mb_strlen($content, 'utf-8') : strlen($content);
$underline = ($level === 1) ? '=' : '-';
return $content . "\n" . str_repeat($underline, $length) . "\n\n";
}
/**
* @param int $level
* @param string $content
*
* @return string
*/
private function createAtxHeader($level, $content)
{
$prefix = str_repeat('#', $level) . ' ';
return $prefix . $content . "\n\n";
}
}
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