32 lines
856 B
Rust
32 lines
856 B
Rust
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//! Maps paths to compact integer ids. We don't care about clearings paths which
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//! no longer exist -- the assumption is total size of paths we ever look at is
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//! not too big.
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use rustc_hash::FxHashMap;
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use crate::{FileId, VfsPath};
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#[derive(Default)]
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pub(crate) struct PathInterner {
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map: FxHashMap<VfsPath, FileId>,
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vec: Vec<VfsPath>,
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}
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impl PathInterner {
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pub(crate) fn get(&self, path: &VfsPath) -> Option<FileId> {
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self.map.get(path).copied()
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}
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pub(crate) fn intern(&mut self, path: VfsPath) -> FileId {
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if let Some(id) = self.get(&path) {
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return id;
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}
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let id = FileId(self.vec.len() as u32);
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self.map.insert(path.clone(), id);
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self.vec.push(path);
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id
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}
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pub(crate) fn lookup(&self, id: FileId) -> &VfsPath {
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&self.vec[id.0 as usize]
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}
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}
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