function read($len = null)
{
if (!class_exists('Tidy')) {
throw new BuildException("You must enable the 'tidy' extension in your PHP configuration in order to use the Tidy filter.");
}
if (!$this->getInitialized()) {
$this->_initialize();
$this->setInitialized(true);
}
$buffer = $this->in->read($len);
if ($buffer === -1) {
return -1;
}
$config = $this->getDistilledConfig();
$tidy = new Tidy();
$tidy->parseString($buffer, $config, $this->encoding);
$tidy->cleanRepair();
return tidy_get_output($tidy);
}