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use std::sync::Arc;
use relative_path::RelativePathBuf;
use rustc_hash::{FxHashMap, FxHashSet};
use ra_syntax::{
SmolStr,
ast::{self, NameOwner},
};
use crate::{
FileId, Cancelable, FileResolverImp, db,
input::{SourceRoot, SourceRootId},
};
use super::{
ModuleData, ModuleTree, ModuleId, LinkId, LinkData, Problem, ModulesDatabase, ModuleScope
};
pub(super) fn submodules(db: &impl ModulesDatabase, file_id: FileId) -> Cancelable<Arc<Vec<SmolStr>>> {
db::check_canceled(db)?;
let file = db.file_syntax(file_id);
let root = file.ast();
let submodules = modules(root).map(|(name, _)| name).collect();
Ok(Arc::new(submodules))
}
pub(super) fn modules(root: ast::Root<'_>) -> impl Iterator<Item = (SmolStr, ast::Module<'_>)> {
root.modules().filter_map(|module| {
let name = module.name()?.text();
if !module.has_semi() {
return None;
}
Some((name, module))
})
}
pub(super) fn module_scope(
db: &impl ModulesDatabase,
source_root_id: SourceRootId,
module_id: ModuleId,
) -> Cancelable<Arc<ModuleScope>> {
let tree = db.module_tree(source_root_id)?;
let file_id = module_id.file_id(&tree);
let syntax = db.file_syntax(file_id);
let res = ModuleScope::new(&syntax);
Ok(Arc::new(res))
}
pub(super) fn module_tree(
db: &impl ModulesDatabase,
source_root: SourceRootId,
) -> Cancelable<Arc<ModuleTree>> {
db::check_canceled(db)?;
let res = create_module_tree(db, source_root)?;
Ok(Arc::new(res))
}
#[derive(Clone, Hash, PartialEq, Eq, Debug)]
pub struct Submodule {
pub name: SmolStr,
}
fn create_module_tree<'a>(
db: &impl ModulesDatabase,
source_root: SourceRootId,
) -> Cancelable<ModuleTree> {
let mut tree = ModuleTree {
mods: Vec::new(),
links: Vec::new(),
};
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() {
if visited.contains(&file_id) {
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, file_id)?;
roots.insert(file_id, module_id);
}
Ok(tree)
}
fn build_subtree(
db: &impl ModulesDatabase,
source_root: &SourceRoot,
tree: &mut ModuleTree,
visited: &mut FxHashSet<FileId>,
roots: &mut FxHashMap<FileId, ModuleId>,
parent: Option<LinkId>,
file_id: FileId,
) -> Cancelable<ModuleId> {
visited.insert(file_id);
let id = tree.push_mod(ModuleData {
file_id,
parent,
children: Vec::new(),
});
for name in db.submodules(file_id)?.iter() {
let (points_to, problem) = resolve_submodule(file_id, name, &source_root.file_resolver);
let link = tree.push_link(LinkData {
name: name.clone(),
owner: id,
points_to: Vec::new(),
problem: None,
});
let points_to = points_to
.into_iter()
.map(|file_id| match roots.remove(&file_id) {
Some(module_id) => {
tree.module_mut(module_id).parent = Some(link);
Ok(module_id)
}
None => build_subtree(db, source_root, tree, visited, roots, Some(link), file_id),
})
.collect::<Cancelable<Vec<_>>>()?;
tree.link_mut(link).points_to = points_to;
tree.link_mut(link).problem = problem;
}
Ok(id)
}
fn resolve_submodule(
file_id: FileId,
name: &SmolStr,
file_resolver: &FileResolverImp,
) -> (Vec<FileId>, Option<Problem>) {
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 points_to: Vec<FileId>;
let problem: Option<Problem>;
if is_dir_owner {
points_to = [&file_mod, &dir_mod]
.iter()
.filter_map(|path| file_resolver.resolve(file_id, path))
.collect();
problem = if points_to.is_empty() {
Some(Problem::UnresolvedModule {
candidate: file_mod,
})
} else {
None
}
} else {
points_to = Vec::new();
problem = Some(Problem::NotDirOwner {
move_to: RelativePathBuf::from(format!("../{}/mod.rs", mod_name)),
candidate: file_mod,
});
}
(points_to, problem)
}
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