function filter(HatenaSyntax_Node $rootnode)
{
if ($rootnode->getType() !== 'root') {
throw new Exception();
}
$header_arr = $this->fetchHeader($rootnode);
$ret = array();
foreach ($header_arr as $header) {
$buf = $header->getData();
$ret[] = array('level' => $buf['level'], 'value' => $header);
}
return $ret;
}
protected function renderNode(HatenaSyntax_Node $node)
{
$ret = $this->{'render' . $node->getType()}($node->getData());
return $ret;
}
protected static function assertRootNode(HatenaSyntax_Node $node)
{
if ($node->getType() !== 'root') {
throw new InvalidArgumentException('this node must be root node');
}
}
