| 1 | use crate::token::{Id, Span}; |
|---|---|
| 2 | use std::cell::Cell; |
| 3 | |
| 4 | thread_local!(static NEXT: Cell<u32> = Cell::new(0)); |
| 5 | |
| 6 | pub fn reset() { |
| 7 | NEXT.with(|c: &Cell |
| 8 | } |
| 9 | |
| 10 | pub fn generate(span: Span) -> Id<'static> { |
| 11 | NEXT.with(|next: &Cell |
| 12 | let generation: u32 = next.get() + 1; |
| 13 | next.set(val:generation); |
| 14 | Id::gensym(span, generation) |
| 15 | }) |
| 16 | } |
| 17 | |
| 18 | pub fn fill<'a>(span: Span, slot: &mut Option<Id<'a>>) -> Id<'a> { |
| 19 | *slot.get_or_insert_with(|| generate(span)) |
| 20 | } |
| 21 |