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use std::path::{Component, Path, PathBuf};
use im;
use ra_analysis::{FileId, FileResolver};
use relative_path::RelativePath;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Root {
Workspace,
Lib,
}
#[derive(Debug, Default, Clone)]
pub struct PathMap {
next_id: u32,
path2id: im::HashMap<PathBuf, FileId>,
id2path: im::HashMap<FileId, PathBuf>,
id2root: im::HashMap<FileId, Root>,
}
impl PathMap {
pub fn new() -> PathMap {
Default::default()
}
pub fn get_or_insert(&mut self, path: PathBuf, root: Root) -> FileId {
self.path2id
.get(path.as_path())
.map(|&id| id)
.unwrap_or_else(|| {
let id = self.new_file_id();
self.insert(path, id, root);
id
})
}
pub fn get_id(&self, path: &Path) -> Option<FileId> {
self.path2id.get(path).map(|&id| id)
}
pub fn get_path(&self, file_id: FileId) -> &Path {
self.id2path.get(&file_id).unwrap().as_path()
}
pub fn get_root(&self, file_id: FileId) -> Root {
self.id2root[&file_id]
}
fn insert(&mut self, path: PathBuf, file_id: FileId, root: Root) {
self.path2id.insert(path.clone(), file_id);
self.id2path.insert(file_id, path.clone());
self.id2root.insert(file_id, root);
}
fn new_file_id(&mut self) -> FileId {
let id = FileId(self.next_id);
self.next_id += 1;
id
}
}
impl FileResolver for PathMap {
fn file_stem(&self, file_id: FileId) -> String {
self.get_path(file_id)
.file_stem()
.unwrap()
.to_str()
.unwrap()
.to_string()
}
fn resolve(&self, file_id: FileId, path: &RelativePath) -> Option<FileId> {
let path = path.to_path(&self.get_path(file_id));
let path = normalize(&path);
self.get_id(&path)
}
}
fn normalize(path: &Path) -> PathBuf {
let mut components = path.components().peekable();
let mut ret = if let Some(c @ Component::Prefix(..)) = components.peek().cloned() {
components.next();
PathBuf::from(c.as_os_str())
} else {
PathBuf::new()
};
for component in components {
match component {
Component::Prefix(..) => unreachable!(),
Component::RootDir => {
ret.push(component.as_os_str());
}
Component::CurDir => {}
Component::ParentDir => {
ret.pop();
}
Component::Normal(c) => {
ret.push(c);
}
}
}
ret
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_resolve() {
let mut m = PathMap::new();
let id1 = m.get_or_insert(PathBuf::from("/foo"), Root::Workspace);
let id2 = m.get_or_insert(PathBuf::from("/foo/bar.rs"), Root::Workspace);
assert_eq!(m.resolve(id1, &RelativePath::new("bar.rs")), Some(id2),)
}
}
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