piccolo 0.3.3

Stackless Lua VM implemented in pure Rust
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

use std::rc::Rc;

use ahash::HashSet;

pub trait StringInterner {
    type String: AsRef<[u8]> + Clone;

    fn intern(&mut self, s: &[u8]) -> Self::String;
}

impl<'a, S: StringInterner> StringInterner for &'a mut S {
    type String = S::String;

    fn intern(&mut self, s: &[u8]) -> Self::String {
        S::intern(self, s)
    }
}

#[derive(Default)]
pub struct BasicInterner(HashSet<Rc<[u8]>>);

impl StringInterner for BasicInterner {
    type String = Rc<[u8]>;

    fn intern(&mut self, string: &[u8]) -> Self::String {
        if let Some(s) = self.0.get(string) {
            s.clone()
        } else {
            let s = Rc::from(Box::from(string));
            self.0.insert(Rc::clone(&s));
            s
        }
    }
}