/**
* @param string|NameNode|CommaListNode|array|NULL $implements
* @throws \InvalidArgumentException
* @return $this
*/
public function setImplements($implements)
{
if ($implements === NULL) {
if (isset($this->implements)) {
// Remove whitespace after implements keyword.
$this->implements->previous()->remove();
// Remove implements keyword
$this->implements->previous()->remove();
// Remove whitespace before implements keyword.
$this->implements->previous()->remove();
// Remove implements list.
$this->implements->remove();
$this->implements = NULL;
}
} else {
// Type conversions.
if (is_string($implements)) {
$implements = NameNode::create($implements);
}
if ($implements instanceof NameNode) {
$implementList = new CommaListNode();
$implementList->append($implements);
$implements = $implementList;
}
if (is_array($implements)) {
$implementList = new CommaListNode();
foreach ($implements as $implement) {
if (is_string($implement)) {
$implementList->appendItem(NameNode::create($implement));
} elseif ($implement instanceof NameNode) {
$implementList->appendItem($implement);
} else {
throw new \InvalidArgumentException('Invalid $implements argument');
}
}
$implements = $implementList;
}
// Set implements.
if (isset($this->implements)) {
$this->implements->replaceWith($implements);
} else {
$after = isset($this->extends) ? $this->extends : $this->name;
$after->after([Token::space(), Token::_implements(), Token::space(), $implements]);
}
$this->implements = $implements;
}
return $this;
}
