101 lines
2.3 KiB
Rust
101 lines
2.3 KiB
Rust
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use parking_lot::Mutex;
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use std::hash::Hash;
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use rustc_hash::FxHashMap;
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/// There are two principle ways to refer to things:
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/// - by their locatinon (module in foo/bar/baz.rs at line 42)
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/// - by their numeric id (module `ModuleId(42)`)
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///
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/// The first one is more powerful (you can actually find the thing in question
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/// by id), but the second one is so much more compact.
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///
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/// `Loc2IdMap` allows us to have a cake an eat it as well: by maintaining a
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/// bidirectional mapping between positional and numeric ids, we can use compact
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/// representation wich still allows us to get the actual item
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#[derive(Debug)]
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struct Loc2IdMap<LOC, ID>
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where
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ID: NumericId,
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LOC: Clone + Eq + Hash,
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{
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loc2id: FxHashMap<LOC, ID>,
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id2loc: FxHashMap<ID, LOC>,
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}
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impl<LOC, ID> Default for Loc2IdMap<LOC, ID>
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where
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ID: NumericId,
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LOC: Clone + Eq + Hash,
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{
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fn default() -> Self {
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Loc2IdMap {
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loc2id: FxHashMap::default(),
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id2loc: FxHashMap::default(),
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}
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}
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}
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impl<LOC, ID> Loc2IdMap<LOC, ID>
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where
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ID: NumericId,
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LOC: Clone + Eq + Hash,
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{
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pub fn loc2id(&mut self, loc: &LOC) -> ID {
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match self.loc2id.get(loc) {
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Some(id) => return id.clone(),
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None => (),
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}
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let id = self.loc2id.len();
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assert!(id < u32::max_value() as usize);
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let id = ID::from_u32(id as u32);
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self.loc2id.insert(loc.clone(), id.clone());
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self.id2loc.insert(id.clone(), loc.clone());
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id
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}
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pub fn id2loc(&self, id: ID) -> LOC {
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self.id2loc[&id].clone()
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}
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}
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pub trait NumericId: Clone + Eq + Hash {
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fn from_u32(id: u32) -> Self;
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fn to_u32(self) -> u32;
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}
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#[derive(Debug)]
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pub struct LocationIntener<LOC, ID>
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where
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ID: NumericId,
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LOC: Clone + Eq + Hash,
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{
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map: Mutex<Loc2IdMap<LOC, ID>>,
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}
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impl<LOC, ID> Default for LocationIntener<LOC, ID>
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where
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ID: NumericId,
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LOC: Clone + Eq + Hash,
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{
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fn default() -> Self {
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LocationIntener {
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map: Default::default(),
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}
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}
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}
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impl<LOC, ID> LocationIntener<LOC, ID>
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where
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ID: NumericId,
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LOC: Clone + Eq + Hash,
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{
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pub fn loc2id(&self, loc: &LOC) -> ID {
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self.map.lock().loc2id(loc)
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}
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pub fn id2loc(&self, id: ID) -> LOC {
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self.map.lock().id2loc(id)
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}
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}
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