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use na::RealField;
use node::*;
#[derive(Debug)]
pub struct Ancestors<T>
where
T: RealField,
{
parent: Option<Node<T>>,
}
impl<T> Ancestors<T>
where
T: RealField,
{
pub fn new(parent: Option<Node<T>>) -> Self {
Self { parent }
}
}
impl<T> Iterator for Ancestors<T>
where
T: RealField,
{
type Item = Node<T>;
#[allow(clippy::question_mark)]
fn next(&mut self) -> Option<Node<T>> {
if self.parent.is_none() {
return None;
}
let next = self.parent.clone().unwrap();
self.parent = next.parent().clone();
Some(next)
}
}
#[derive(Debug)]
pub struct Descendants<T>
where
T: RealField,
{
stack: Vec<Node<T>>,
}
impl<T> Descendants<T>
where
T: RealField,
{
pub fn new(stack: Vec<Node<T>>) -> Self {
Self { stack }
}
}
impl<T> Iterator for Descendants<T>
where
T: RealField,
{
type Item = Node<T>;
fn next(&mut self) -> Option<Self::Item> {
let node = match self.stack.pop() {
Some(node) => node,
None => {
return None;
}
};
self.stack.extend(node.children().clone());
Some(node)
}
}