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use std::sync::{Arc, RwLock};
use rustc_hash::FxHashMap;
use serde::{Deserialize, Serialize};
use stc_visit::Visit;
use swc_common::{EqIgnoreSpan, FileName, Mark, TypeEq};
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, EqIgnoreSpan, TypeEq, Visit, Serialize, Deserialize)]
pub struct ModuleId(u32);
impl ModuleId {
pub const fn builtin() -> Self {
ModuleId(0)
}
pub fn is_builtin(self) -> bool {
self.0 == 0
}
}
#[derive(Default)]
pub struct ModuleIdGenerator {
cache: RwLock<Data>,
}
#[derive(Default)]
struct Data {
cur: u32,
modules: FxHashMap<Arc<FileName>, (ModuleId, Mark)>,
paths: FxHashMap<ModuleId, (Arc<FileName>, Mark)>,
}
impl ModuleIdGenerator {
pub fn generate(&self, path: &Arc<FileName>) -> (ModuleId, Mark) {
let mut data = self.cache.write().unwrap();
if let Some(v) = data.modules.get(path) {
return *v;
}
data.cur += 1;
let top_level_mark = Mark::new();
let module_id = ModuleId(data.cur);
let res = data.modules.insert(path.clone(), (module_id, top_level_mark));
data.paths.insert(module_id, (path.clone(), top_level_mark));
debug_assert_eq!(res, None, "Found multiple module id for one file");
(module_id, top_level_mark)
}
pub fn path(&self, module_id: ModuleId) -> Arc<FileName> {
self.cache.read().unwrap().paths.get(&module_id).cloned().unwrap().0
}
pub fn top_level_mark(&self, module_id: ModuleId) -> Mark {
self.cache.read().unwrap().paths.get(&module_id).cloned().unwrap().1
}
}