Markdownify\Converter::parseString PHP Метод

    public function parseString($html)
    {
        $this->resetState();
        $this->parser->html = $html;
        $this->parse();
        return $this->output;
    }

 /**
  * @inheritdoc
  */
 public function transform($value)
 {
     if (is_null($value)) {
         return $value;
     }
     if (is_scalar($value)) {
         $value = (string) $value;
     }
     if (!is_string($value)) {
         throw new TransformationFailedException(sprintf('Expected a string to transform, got %s instead', json_encode($value)));
     }
     // replace non-breaking spaces, somehow this results in a question mark when markdownifying
     $value = str_replace([' ', " "], ' ', $value);
     // remove leading spaces/tabs
     $value = preg_replace('/^[ \\t]+/m', '', $value);
     // purify the html first
     $value = $this->purifier->purify($value);
     // perform some replacements...
     $replacements = [[['/>\\s+</', '/\\s+<\\//'], ['><', '</']], [['/\\s+<br\\/?>/', '/<br\\/?>\\s+/'], '<br>'], ['/([^>])\\n([^<])/', '\\1<br>\\2'], ['/(<(p|li)>)<br\\s?\\/?>/i', '\\1'], ['/<br\\s?\\/?>(<\\/(p|li)>)/i', '\\1']];
     foreach ($replacements as list($search, $replace)) {
         $value = preg_replace($search, $replace, $value);
     }
     // strip tags in headings
     foreach (range(1, 6) as $headingSize) {
         $value = preg_replace_callback('/(<h' . $headingSize . '>)(.*)(<\\/h' . $headingSize . '>)/iU', function ($matches) {
             if (count($matches) !== 4) {
                 return $matches[0];
             }
             return $matches[1] . trim(strip_tags(str_replace('<br>', ' ', $matches[2]))) . $matches[3];
         }, $value);
     }
     // remove any double bullets
     $value = preg_replace('/(<li>\\s*)[\\*|\\-]{1}/im', '\\1', $value);
     // convert to markdown
     $value = @$this->converter->parseString($value);
     // Fix different types of bullets. What this does is check each line if it starts with any of "-ו○",
     // not followed by another bullet, and normalizes it to "* text".
     $value = preg_replace('/^[\\-ו○]\\s*([^\\-ו○])/mu', '* $1', $value);
     // Now make sure there's a newline before 2 consecutive lines that start with a bullet.
     // This could lead to superfluous newlines, but they will be corrected later on.
     $value = preg_replace('/(\\n\\* [^\\n]+){2,}/', "\n\$0", "\n" . $value);
     // remove trailing spaces/tabs
     $value = preg_replace('/[ \\t]+$/m', '', $value);
     // remove excessive newlines
     $value = preg_replace('/\\n{3,}/m', "\n\n", $value);
     return trim($value);
 }