Function petgraph::visit::depth_first_search

pub fn depth_first_search<G, I, F, C>(graph: G, starts: I, visitor: F) -> C where
    G: IntoNeighbors + Visitable,
    I: IntoIterator<Item = G::NodeId>,
    F: FnMut(DfsEvent<G::NodeId>) -> C,
    C: ControlFlow, 

A recursive depth first search.

Starting points are the nodes in the iterator starts (specify just one start vertex x by using Some(x)).

The traversal emits discovery and finish events for each reachable vertex, and edge classification of each reachable edge. visitor is called for each event, see DfsEvent for possible values.

If the return value of the visitor is simply (), the visit runs until it is finished. If the return value is a Control<B>, it can be used to change the control flow of the search. Control::Break will stop the visit early, returning the contained value from the function. Control::Prune will stop traversing any additional edges from the current node and proceed immediately to the Finish event.

*Panics if you attempt to prune a node from its Finish event.

Example

Find a path from vertex 0 to 5, and exit the visit as soon as we reach the goal vertex.

use petgraph::prelude::*;
use petgraph::graph::node_index as n;
use petgraph::visit::depth_first_search;
use petgraph::visit::{DfsEvent, Control};

let gr: Graph<(), ()> = Graph::from_edges(&[
    (0, 1), (0, 2), (0, 3),
    (1, 3),
    (2, 3), (2, 4),
    (4, 0), (4, 5),
]);

// record each predecessor, mapping node → node
let mut predecessor = vec![NodeIndex::end(); gr.node_count()];
let start = n(0);
let goal = n(5);
depth_first_search(&gr, Some(start), |event| {
    if let DfsEvent::TreeEdge(u, v) = event {
        predecessor[v.index()] = u;
        if v == goal {
            return Control::Break(v);
        }
    }
    Control::Continue
});

let mut next = goal;
let mut path = vec![next];
while next != start {
    let pred = predecessor[next.index()];
    path.push(pred);
    next = pred;
}
path.reverse();
assert_eq!(&path, &[n(0), n(2), n(4), n(5)]);