/**
* @param ExpressionNode|NULL $node
* @return $this
*/
public function setValue($node)
{
if ($node === NULL) {
if (isset($this->value)) {
$this->value->previousUntil(Filter::isInstanceOf('\\Pharborist\\Variables\\VariableNode'))->remove();
$this->value->remove();
}
} else {
if (isset($this->value)) {
/** @var Node $node */
$this->value->replaceWith($node);
} else {
$this->append([Token::space(), Token::assign(), Token::space(), $node]);
}
}
return $this;
}