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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 crate::{
db,
descriptors::DescriptorDatabase,
input::{SourceRoot, SourceRootId},
Cancelable, FileId, FileResolverImp,
};
use super::{
LinkData, LinkId, ModuleData, ModuleId, ModuleSource, ModuleSourceNode,
ModuleTree, Problem,
};
#[derive(Clone, Hash, PartialEq, Eq, Debug)]
pub(crate) 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 submodules(
db: &impl DescriptorDatabase,
source: ModuleSource,
) -> Cancelable<Arc<Vec<Submodule>>> {
db::check_canceled(db)?;
let file_id = source.file_id();
let submodules = match source.resolve(db) {
ModuleSourceNode::SourceFile(it) => collect_submodules(file_id, it.borrowed()),
ModuleSourceNode::Module(it) => it
.borrowed()
.item_list()
.map(|it| collect_submodules(file_id, it))
.unwrap_or_else(Vec::new),
};
return Ok(Arc::new(submodules));
fn collect_submodules<'a>(
file_id: FileId,
root: impl ast::ModuleItemOwner<'a>,
) -> Vec<Submodule> {
modules(root)
.map(|(name, m)| {
if m.has_semi() {
Submodule::Declaration(name)
} else {
let src = ModuleSource::new_inline(file_id, m);
Submodule::Definition(name, src)
}
})
.collect()
}
}
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 DescriptorDatabase,
source_root: SourceRootId,
) -> Cancelable<Arc<ModuleTree>> {
db::check_canceled(db)?;
let res = create_module_tree(db, source_root)?;
Ok(Arc::new(res))
}
fn create_module_tree<'a>(
db: &impl DescriptorDatabase,
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() {
let source = ModuleSource::SourceFile(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 DescriptorDatabase,
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.module_mut(module_id).parent = Some(link);
Ok(module_id)
}
None => build_subtree(
db,
source_root,
tree,
visited,
roots,
Some(link),
ModuleSource::SourceFile(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.link_mut(link).points_to = points_to;
tree.link_mut(link).problem = problem;
}
Ok(id)
}
fn resolve_submodule(
source: ModuleSource,
name: &SmolStr,
file_resolver: &FileResolverImp,
) -> (Vec<FileId>, Option<Problem>) {
let file_id = match source {
ModuleSource::SourceFile(it) => it,
ModuleSource::Module(..) => {
// TODO
return (Vec::new(), None);
}
};
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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