/**
* @param Node|string|array|\Traversable|array $symbol
* @return Node|string|array|\Traversable|array
*/
public function push($symbol)
{
if ($symbol === false || $symbol === null || $symbol === '') {
return $symbol;
}
if ($symbol instanceof Buffer) {
$this->push($symbol->toValue());
} elseif ($symbol instanceof Node) {
$this->parts[] = $symbol;
$this->length++;
} elseif (is_string($symbol)) {
$len = count($this->parts);
if ($len > 0 && is_string($this->parts[$len - 1])) {
$this->parts[$len - 1] .= $symbol;
} else {
$this->parts[] = $symbol;
}
$this->length += strlen($symbol);
$this->strLength += strlen($symbol);
} elseif ($symbol instanceof \Traversable || is_array($symbol)) {
$ret = [];
foreach ($symbol as $part) {
$ret[] = $this->push($part);
}
return $ret;
} else {
throw new \InvalidArgumentException(sprintf('Part type unsupported: %s', get_class($symbol)));
}
return $symbol;
}