public function format($message)
{
$message = (string) $message;
$offset = 0;
$output = '';
$tagRegex = '[a-z][a-z0-9,_=;-]*+';
preg_match_all("#<(({$tagRegex}) | /({$tagRegex})?)>#ix", $message, $matches, PREG_OFFSET_CAPTURE);
foreach ($matches[0] as $i => $match) {
$pos = $match[1];
$text = $match[0];
if (0 != $pos && '\\' == $message[$pos - 1]) {
continue;
}
// add the text up to the next tag
$output .= $this->applyCurrentStyle(substr($message, $offset, $pos - $offset));
$offset = $pos + strlen($text);
// opening tag?
if ($open = '/' != $text[1]) {
$tag = $matches[1][$i][0];
} else {
$tag = isset($matches[3][$i][0]) ? $matches[3][$i][0] : '';
}
if (!$open && !$tag) {
// </>
$this->styleStack->pop();
} elseif (false === ($style = $this->createStyleFromString(strtolower($tag)))) {
$output .= $this->applyCurrentStyle($text);
} elseif ($open) {
$this->styleStack->push($style);
} else {
$this->styleStack->pop($style);
}
}
$output .= $this->applyCurrentStyle(substr($message, $offset));
if (false !== strpos($output, '<<')) {
return strtr($output, array('\\<' => '<', '<<' => '\\'));
}
return str_replace('\\<', '<', $output);
}