ya_sb_util/
lib.rs

1use std::collections::{hash_map::Entry, HashMap};
2
3#[cfg(feature = "with-futures")]
4pub use crate::futures::IntoFlatten as _;
5
6#[cfg(feature = "with-bytes")]
7pub mod bytes;
8
9#[cfg(feature = "with-futures")]
10pub mod futures;
11
12#[cfg(feature = "with-writer")]
13pub mod writer;
14
15#[cfg(feature = "with-tls")]
16pub mod tls;
17
18pub struct RevPrefixes<'a>(pub &'a str);
19
20impl<'a> Iterator for RevPrefixes<'a> {
21    type Item = &'a str;
22
23    fn next(&mut self) -> Option<Self::Item> {
24        let cv = self.0;
25        if cv.is_empty() {
26            return None;
27        }
28        if let Some(sep_pos) = cv.rfind('/') {
29            self.0 = &cv[..sep_pos];
30        } else {
31            self.0 = ""
32        }
33        Some(cv)
34    }
35}
36
37pub struct PrefixLookupBag<T> {
38    dict: HashMap<String, T>,
39}
40
41impl<T> Default for PrefixLookupBag<T> {
42    fn default() -> Self {
43        PrefixLookupBag {
44            dict: HashMap::new(),
45        }
46    }
47}
48
49impl<T> PrefixLookupBag<T> {
50    pub fn get(&self, key: &str) -> Option<&T> {
51        RevPrefixes(key).find_map(|key| self.dict.get(key))
52    }
53
54    pub fn keys(&self) -> impl Iterator<Item = &String> {
55        self.dict.keys()
56    }
57
58    pub fn get_mut(&mut self, key: &str) -> Option<&mut T> {
59        if let Some(k) = RevPrefixes(key).find(|&k| self.dict.contains_key(k)) {
60            self.dict.get_mut(k)
61        } else {
62            None
63        }
64    }
65
66    pub fn insert(&mut self, key: String, v: T) -> Option<T> {
67        self.dict.insert(key, v)
68    }
69
70    pub fn entry(&mut self, key: String) -> Entry<String, T> {
71        if let Some(k) = RevPrefixes(&key).find(|&k| self.dict.contains_key(k)) {
72            self.dict.entry(k.to_owned())
73        } else {
74            self.dict.entry(key)
75        }
76    }
77
78    pub fn remove(&mut self, key: &str) -> Option<T> {
79        self.dict.remove(key)
80    }
81
82    pub fn len(&self) -> usize {
83        self.dict.len()
84    }
85
86    pub fn is_empty(&self) -> bool {
87        self.dict.is_empty()
88    }
89}
90
91#[cfg(test)]
92mod test {
93    use super::*;
94
95    #[test]
96    fn test_rev() {
97        let v: Vec<_> = RevPrefixes("/net/0x1212xx/from/0x123/exeunit/exec").collect();
98        assert_eq!(
99            v,
100            [
101                "/net/0x1212xx/from/0x123/exeunit/exec",
102                "/net/0x1212xx/from/0x123/exeunit",
103                "/net/0x1212xx/from/0x123",
104                "/net/0x1212xx/from",
105                "/net/0x1212xx",
106                "/net"
107            ]
108        );
109        let v: Vec<_> = RevPrefixes("").collect();
110        assert!(v.is_empty());
111    }
112
113    #[test]
114    fn test_prefix_bag() {
115        let mut bag = PrefixLookupBag::default();
116
117        bag.insert("/ala/ma/kota".into(), 1);
118        bag.insert("/ala/ma/psa".into(), 2);
119        bag.insert("/ala".into(), 7);
120
121        assert_eq!(bag.get("/ala/ma/smoka"), Some(&7));
122        assert_eq!(bag.get("/ala/ma/kota"), Some(&1));
123        assert_eq!(bag.get("/jola/ma/psa"), None);
124    }
125}
ya_sb_util/lib.rs

ya_sb_util/
lib.rs
