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|
use std::sync::Arc;
use ra_syntax::{
ast::{self, NameOwner},
SmolStr,
};
use relative_path::RelativePathBuf;
use rustc_hash::{FxHashMap, FxHashSet};
use ra_db::{SourceRoot, SourceRootId, FileResolverImp, Cancelable, FileId,};
use crate::{
HirDatabase,
};
use super::{
LinkData, LinkId, ModuleData, ModuleId, ModuleSource,
ModuleTree, Problem,
};
#[derive(Clone, Hash, PartialEq, Eq, Debug)]
pub enum Submodule {
Declaration(SmolStr),
Definition(SmolStr, ModuleSource),
}
impl Submodule {
fn name(&self) -> &SmolStr {
match self {
Submodule::Declaration(name) => name,
Submodule::Definition(name, _) => name,
}
}
}
pub(crate) fn modules<'a>(
root: impl ast::ModuleItemOwner<'a>,
) -> impl Iterator<Item = (SmolStr, ast::Module<'a>)> {
root.items()
.filter_map(|item| match item {
ast::ModuleItem::Module(m) => Some(m),
_ => None,
})
.filter_map(|module| {
let name = module.name()?.text();
Some((name, module))
})
}
pub(crate) fn module_tree(
db: &impl HirDatabase,
source_root: SourceRootId,
) -> Cancelable<Arc<ModuleTree>> {
db.check_canceled()?;
let res = create_module_tree(db, source_root)?;
Ok(Arc::new(res))
}
fn create_module_tree<'a>(
db: &impl HirDatabase,
source_root: SourceRootId,
) -> Cancelable<ModuleTree> {
let mut tree = ModuleTree::default();
let mut roots = FxHashMap::default();
let mut visited = FxHashSet::default();
let source_root = db.source_root(source_root);
for &file_id in source_root.files.iter() {
let source = ModuleSource::new_file(db, file_id);
if visited.contains(&source) {
continue; // TODO: use explicit crate_roots here
}
assert!(!roots.contains_key(&file_id));
let module_id = build_subtree(
db,
&source_root,
&mut tree,
&mut visited,
&mut roots,
None,
source,
)?;
roots.insert(file_id, module_id);
}
Ok(tree)
}
fn build_subtree(
db: &impl HirDatabase,
source_root: &SourceRoot,
tree: &mut ModuleTree,
visited: &mut FxHashSet<ModuleSource>,
roots: &mut FxHashMap<FileId, ModuleId>,
parent: Option<LinkId>,
source: ModuleSource,
) -> Cancelable<ModuleId> {
visited.insert(source);
let id = tree.push_mod(ModuleData {
source,
parent,
children: Vec::new(),
});
for sub in db.submodules(source)?.iter() {
let link = tree.push_link(LinkData {
name: sub.name().clone(),
owner: id,
points_to: Vec::new(),
problem: None,
});
let (points_to, problem) = match sub {
Submodule::Declaration(name) => {
let (points_to, problem) =
resolve_submodule(source, &name, &source_root.file_resolver);
let points_to = points_to
.into_iter()
.map(|file_id| match roots.remove(&file_id) {
Some(module_id) => {
tree.mods[module_id].parent = Some(link);
Ok(module_id)
}
None => build_subtree(
db,
source_root,
tree,
visited,
roots,
Some(link),
ModuleSource::new_file(db, file_id),
),
})
.collect::<Cancelable<Vec<_>>>()?;
(points_to, problem)
}
Submodule::Definition(_name, submodule_source) => {
let points_to = build_subtree(
db,
source_root,
tree,
visited,
roots,
Some(link),
*submodule_source,
)?;
(vec![points_to], None)
}
};
tree.links[link].points_to = points_to;
tree.links[link].problem = problem;
}
Ok(id)
}
fn resolve_submodule(
source: ModuleSource,
name: &SmolStr,
file_resolver: &FileResolverImp,
) -> (Vec<FileId>, Option<Problem>) {
// TODO: handle submodules of inline modules properly
let file_id = source.file_id();
let mod_name = file_resolver.file_stem(file_id);
let is_dir_owner = mod_name == "mod" || mod_name == "lib" || mod_name == "main";
let file_mod = RelativePathBuf::from(format!("../{}.rs", name));
let dir_mod = RelativePathBuf::from(format!("../{}/mod.rs", name));
let file_dir_mod = RelativePathBuf::from(format!("../{}/{}.rs", mod_name, name));
let tmp1;
let tmp2;
let candidates = if is_dir_owner {
tmp1 = [&file_mod, &dir_mod];
tmp1.iter()
} else {
tmp2 = [&file_dir_mod];
tmp2.iter()
};
let points_to = candidates
.filter_map(|path| file_resolver.resolve(file_id, path))
.collect::<Vec<_>>();
let problem = if points_to.is_empty() {
Some(Problem::UnresolvedModule {
candidate: if is_dir_owner { file_mod } else { file_dir_mod },
})
} else {
None
};
(points_to, problem)
}
|
