beehave/
sequence.rs

1use behaviour_result::BehaviourResult;
2use behaviour_node::BehaviourNode;
3
4/// A composite node which stops evaluating it's children and returns `BehaviourResult::Failure` when a child returns `BehaviourResult::Failure`.
5///
6/// Child nodes can also be added to this node.
7///
8/// A `BehaviourResult::Success` indicates that all of it's children returned `BehaviourResult::Success` when evaluated.
9///
10/// A `BehaviourResult::Failure` indicates that one it's children returned `BehaviourResult::Failure` when evaluated.
11///
12pub struct Sequence<'a, T> {
13    pub name: &'static str,
14    pub children: Vec<Box<BehaviourNode<T> + 'a>>
15}
16
17impl <'a, T: 'a> Sequence<'a, T> {
18
19    pub fn new(name: &'static str) -> Sequence<'a, T> {
20        Sequence {
21            name: name,
22            children: vec![]
23        }
24    }
25
26    pub fn with_capacity(name: &'static str, capacity: usize) -> Sequence<'a, T> {
27        Sequence {
28            name: name,
29            children: Vec::with_capacity(capacity)
30        }
31    }
32
33    pub fn with_children(name: &'static str, children: Vec<Box<BehaviourNode<T> + 'a>>) -> Sequence<'a, T> {
34        Sequence {
35            name: name,
36            children: children
37        }
38    }
39
40    pub fn children(&mut self, new_children: Vec<Box<BehaviourNode<T> + 'a>>) {
41        self.children = new_children;
42    }
43
44    pub fn add(&mut self, new_child: Box<BehaviourNode<T> + 'a>) {
45        self.children.push(new_child);
46    }
47
48}
49
50impl <'a, T: 'a> BehaviourNode<T> for Sequence<'a, T> {
51
52    fn evaluate(&mut self, target: &mut T) -> BehaviourResult {
53
54        for child in self.children.iter_mut() {
55            let result = child.evaluate(target);
56            match result {
57                BehaviourResult::Success => { /* Null-Op */ },
58                _ => { return result; }
59            }
60        }
61
62        BehaviourResult::Success
63    }
64
65}
beehave/sequence.rs

beehave/
sequence.rs
