statsig_rust/evaluation/user_agent_parsing/statsig_uaparser/
window_iter.rs

1use std::collections::VecDeque;
2
3pub struct WindowIter<'a> {
4    iter: std::str::Split<'a, [char; 2]>,
5    window: VecDeque<&'a str>,
6}
7
8type Window<'a> = (
9    Option<&'a str>,
10    Option<&'a str>,
11    Option<&'a str>,
12    Option<&'a str>,
13);
14
15impl<'a> WindowIter<'a> {
16    pub fn new(input: &'a str) -> Self {
17        let mut iter: std::str::Split<'_, [char; 2]> = input.split([';', ' ']);
18        let mut window = VecDeque::new();
19
20        for _ in 0..4 {
21            if let Some(word) = iter.next() {
22                window.push_back(word);
23            }
24        }
25
26        Self { iter, window }
27    }
28
29    #[allow(clippy::get_first)]
30    pub fn get_window(&self) -> Window<'a> {
31        (
32            self.window.get(0).copied(),
33            self.window.get(1).copied(),
34            self.window.get(2).copied(),
35            self.window.get(3).copied(),
36        )
37    }
38
39    pub fn slide_window_by(&mut self, n: usize) {
40        for _ in 0..n {
41            self.window.pop_front();
42            if let Some(word) = self.iter.next() {
43                self.window.push_back(word);
44            }
45        }
46    }
47
48    pub fn is_empty(&self) -> bool {
49        self.window.is_empty()
50    }
51}

statsig_rust/evaluation/user_agent_parsing/statsig_uaparser/window_iter.rs

statsig_rust/evaluation/user_agent_parsing/statsig_uaparser/
window_iter.rs