Struct TreeZipper 

pub struct TreeZipper {
    pub focus: TreeNodeExt,
    pub context: Vec<(String, Vec<TreeNodeExt>, Vec<TreeNodeExt>)>,
}

A simple tree zipper for navigating trees.

Fields

focus: TreeNodeExt

Current focus node

context: Vec<(String, Vec<TreeNodeExt>, Vec<TreeNodeExt>)>

Context: (parent_label, left_siblings, right_siblings)

Implementations

impl TreeZipper

pub fn new(tree: TreeNodeExt) -> Self

Create a zipper from a tree.

pub fn down(self, i: usize) -> Option<Self>

Go down into the i-th child.

pub fn depth(&self) -> usize

Returns the depth (number of levels descended).

pub fn label(&self) -> &str

Returns the label of the current focus node.

Trait Implementations

impl Clone for TreeZipper

fn clone(&self) -> TreeZipper

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TreeZipper

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.