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use std::{
collections::HashMap,
default::Default,
path::{Path, PathBuf},
};
use indexmap::IndexSet;
#[derive(Copy, Clone, Debug, PartialEq, PartialOrd, Eq, Ord, Hash)]
pub struct FileId(u32);
#[derive(Debug, Default)]
pub struct Interner {
map: IndexSet<PathBuf>,
}
impl Interner {
pub fn get<P: AsRef<Path>>(&self, path: P) -> Option<FileId> {
self.map
.get_index_of(path.as_ref())
.map(|i| FileId(i as u32))
}
pub fn intern(&mut self, path: PathBuf) -> FileId {
let (id, _) = self.map.insert_full(path);
FileId(id as u32)
}
pub fn lookup(&self, file: FileId) -> Option<&Path> {
self.map.get_index(file.0 as usize).map(|p| p.as_path())
}
}
#[derive(Default)]
pub struct ReadOnlyVfs {
interner: Interner,
data: HashMap<FileId, Vec<u8>>,
}
impl ReadOnlyVfs {
pub fn singleton<P: AsRef<Path>>(path: P, contents: &[u8]) -> Self {
let mut vfs = ReadOnlyVfs::default();
vfs.set_file_contents(path, contents);
vfs
}
pub fn alloc_file_id<P: AsRef<Path>>(&mut self, path: P) -> FileId {
self.interner.intern(path.as_ref().to_owned())
}
pub fn len(&self) -> usize {
self.data.len()
}
pub fn file_path(&self, file_id: FileId) -> &Path {
self.interner.lookup(file_id).unwrap()
}
pub fn get(&self, file_id: FileId) -> &Vec<u8> {
self.data.get(&file_id).unwrap()
}
pub fn get_str(&self, file_id: FileId) -> &str {
std::str::from_utf8(self.get(file_id)).unwrap()
}
pub fn get_mut(&mut self, file_id: FileId) -> &mut Vec<u8> {
self.data.get_mut(&file_id).unwrap()
}
pub fn set_file_contents<P: AsRef<Path>>(&mut self, path: P, contents: &[u8]) {
let file_id = self.alloc_file_id(path);
self.data.insert(file_id, contents.to_owned());
}
pub fn iter(&self) -> impl Iterator<Item = VfsEntry> {
self.data.iter().map(move |(file_id, _)| VfsEntry {
file_id: *file_id,
file_path: self.file_path(*file_id),
contents: self.get_str(*file_id),
})
}
}
pub struct VfsEntry<'ρ> {
pub file_id: FileId,
pub file_path: &'ρ Path,
pub contents: &'ρ str,
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn trivial() {
let mut vfs = ReadOnlyVfs::default();
let f1 = "a/b/c";
let id1 = vfs.alloc_file_id(f1);
let data = "hello".as_bytes().to_vec();
vfs.set_file_contents(f1, &data);
assert_eq!(vfs.get(id1), &data);
}
}
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