oxihuman-core 0.1.2

Core data structures, algorithms, and asset management for OxiHuman
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162

// Copyright (C) 2026 COOLJAPAN OU (Team KitaSan) / SPDX-License-Identifier: Apache-2.0
#![allow(dead_code)]

/// A compact string that stores short strings inline (up to 23 bytes on 64-bit).
/// Falls back to heap allocation for longer strings.
#[allow(dead_code)]
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct CompactString {
    inner: CompactInner,
}

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
enum CompactInner {
    Inline { buf: [u8; 23], len: u8 },
    Heap(String),
}

const INLINE_CAP: usize = 23;

#[allow(dead_code)]
impl CompactString {
    pub fn new(s: &str) -> Self {
        if s.len() <= INLINE_CAP {
            let mut buf = [0u8; INLINE_CAP];
            buf[..s.len()].copy_from_slice(s.as_bytes());
            Self {
                inner: CompactInner::Inline {
                    buf,
                    len: s.len() as u8,
                },
            }
        } else {
            Self {
                inner: CompactInner::Heap(s.to_string()),
            }
        }
    }

    pub fn as_str(&self) -> &str {
        match &self.inner {
            CompactInner::Inline { buf, len } => {
                std::str::from_utf8(&buf[..*len as usize]).unwrap_or_default()
            }
            CompactInner::Heap(s) => s.as_str(),
        }
    }

    pub fn len(&self) -> usize {
        match &self.inner {
            CompactInner::Inline { len, .. } => *len as usize,
            CompactInner::Heap(s) => s.len(),
        }
    }

    pub fn is_empty(&self) -> bool {
        self.len() == 0
    }

    pub fn is_inline(&self) -> bool {
        matches!(self.inner, CompactInner::Inline { .. })
    }

    pub fn is_heap(&self) -> bool {
        matches!(self.inner, CompactInner::Heap(_))
    }

    pub fn to_string_owned(&self) -> String {
        self.as_str().to_string()
    }

    pub fn starts_with(&self, prefix: &str) -> bool {
        self.as_str().starts_with(prefix)
    }

    pub fn ends_with(&self, suffix: &str) -> bool {
        self.as_str().ends_with(suffix)
    }

    pub fn contains_str(&self, needle: &str) -> bool {
        self.as_str().contains(needle)
    }
}

impl std::fmt::Display for CompactString {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(self.as_str())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_short_inline() {
        let s = CompactString::new("hello");
        assert!(s.is_inline());
        assert_eq!(s.as_str(), "hello");
    }

    #[test]
    fn test_long_heap() {
        let long = "a]".repeat(20);
        let s = CompactString::new(&long);
        assert!(s.is_heap());
        assert_eq!(s.as_str(), long);
    }

    #[test]
    fn test_empty() {
        let s = CompactString::new("");
        assert!(s.is_empty());
        assert!(s.is_inline());
    }

    #[test]
    fn test_len() {
        let s = CompactString::new("abc");
        assert_eq!(s.len(), 3);
    }

    #[test]
    fn test_boundary_23() {
        let exactly = "a".repeat(23);
        let s = CompactString::new(&exactly);
        assert!(s.is_inline());
        assert_eq!(s.len(), 23);
    }

    #[test]
    fn test_boundary_24() {
        let over = "a".repeat(24);
        let s = CompactString::new(&over);
        assert!(s.is_heap());
    }

    #[test]
    fn test_starts_with() {
        let s = CompactString::new("hello world");
        assert!(s.starts_with("hello"));
        assert!(!s.starts_with("world"));
    }

    #[test]
    fn test_ends_with() {
        let s = CompactString::new("test.rs");
        assert!(s.ends_with(".rs"));
    }

    #[test]
    fn test_display() {
        let s = CompactString::new("display");
        assert_eq!(format!("{s}"), "display");
    }

    #[test]
    fn test_eq() {
        let a = CompactString::new("same");
        let b = CompactString::new("same");
        assert_eq!(a, b);
    }
}