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use crate::syntax::set::UnorderedSet as Set;
use lazy_static::lazy_static;
use std::sync::{Mutex, PoisonError};
#[derive(Copy, Clone, Default)]
pub struct InternedString(&'static str);
impl InternedString {
pub fn str(self) -> &'static str {
self.0
}
}
pub fn intern(s: &str) -> InternedString {
lazy_static! {
static ref INTERN: Mutex<Set<&'static str>> = Mutex::new(Set::new());
}
let mut set = INTERN.lock().unwrap_or_else(PoisonError::into_inner);
InternedString(match set.get(s) {
Some(interned) => *interned,
None => {
let interned = Box::leak(Box::from(s));
set.insert(interned);
interned
}
})
}
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