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//! This module resolves `mod foo;` declaration to file.
use hir_expand::name::Name;
use ra_db::{FileId, RelativePathBuf};
use ra_syntax::SmolStr;
use crate::{db::DefDatabase, HirFileId};
#[derive(Clone, Debug)]
pub(super) struct ModDir {
/// `.` for `mod.rs`, `lib.rs`
/// `./foo` for `foo.rs`
/// `./foo/bar` for `mod bar { mod x; }` nested in `foo.rs`
path: RelativePathBuf,
/// inside `./foo.rs`, mods with `#[path]` should *not* be relative to `./foo/`
root_non_dir_owner: bool,
}
impl ModDir {
pub(super) fn root() -> ModDir {
ModDir { path: RelativePathBuf::default(), root_non_dir_owner: false }
}
pub(super) fn descend_into_definition(
&self,
name: &Name,
attr_path: Option<&SmolStr>,
) -> ModDir {
let mut path = self.path.clone();
match attr_to_path(attr_path) {
None => path.push(&name.to_string()),
Some(attr_path) => {
if self.root_non_dir_owner {
assert!(path.pop());
}
path.push(attr_path);
}
}
ModDir { path, root_non_dir_owner: false }
}
pub(super) fn resolve_declaration(
&self,
db: &dyn DefDatabase,
file_id: HirFileId,
name: &Name,
attr_path: Option<&SmolStr>,
) -> Result<(FileId, ModDir), String> {
let file_id = file_id.original_file(db.upcast());
let mut candidate_files = Vec::new();
match attr_to_path(attr_path) {
Some(attr_path) => {
let base =
if self.root_non_dir_owner { self.path.parent().unwrap() } else { &self.path };
candidate_files.push(base.join(attr_path).to_string())
}
None => {
candidate_files.push(self.path.join(&format!("{}.rs", name)).to_string());
candidate_files.push(self.path.join(&format!("{}/mod.rs", name)).to_string());
}
};
for candidate in candidate_files.iter() {
if let Some(file_id) = db.resolve_path(file_id, candidate.as_str()) {
let mut root_non_dir_owner = false;
let mut mod_path = RelativePathBuf::new();
if !(candidate.ends_with("mod.rs") || attr_path.is_some()) {
root_non_dir_owner = true;
mod_path.push(&name.to_string());
}
return Ok((file_id, ModDir { path: mod_path, root_non_dir_owner }));
}
}
Err(candidate_files.remove(0))
}
}
fn attr_to_path(attr: Option<&SmolStr>) -> Option<RelativePathBuf> {
attr.and_then(|it| RelativePathBuf::from_path(&it.replace("\\", "/")).ok())
}
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