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Use shortest path

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This commit is contained in:
Florian Diebold 2019-12-30 22:22:12 +01:00
parent 1ea2b475a9
commit df9d3bd25e
1 changed files with 19 additions and 4 deletions
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23
crates/ra_hir_def/src/find_path.rs
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@ -10,7 +10,6 @@ use hir_expand::name::Name;
// TODO don't import from super imports? or at least deprioritize
// TODO use super?
// TODO use shortest path
// TODO performance / memoize
pub fn find_path(db: &impl DefDatabase, item: ItemInNs, from: ModuleId) -> Option<ModPath> {
@ -61,7 +60,7 @@ pub fn find_path(db: &impl DefDatabase, item: ItemInNs, from: ModuleId) -> Optio
// - otherwise, look for modules containing (reexporting) it and import it from one of those
let importable_locations = find_importable_locations(db, item, from);
// XXX going in order for now
let mut candidate_paths = Vec::new();
for (module_id, name) in importable_locations {
// TODO prevent infinite loops
let mut path = match find_path(db, ItemInNs::Types(ModuleDefId::ModuleId(module_id)), from) {
@ -69,9 +68,9 @@ pub fn find_path(db: &impl DefDatabase, item: ItemInNs, from: ModuleId) -> Optio
Some(path) => path,
};
path.segments.push(name);
return Some(path);
candidate_paths.push(path);
}
None
candidate_paths.into_iter().min_by_key(|path| path.segments.len())
}
fn find_importable_locations(db: &impl DefDatabase, item: ItemInNs, from: ModuleId) -> Vec<(ModuleId, Name)> {
@ -275,4 +274,20 @@ mod tests {
check_found_path(code, "None");
check_found_path(code, "Some");
}
#[test]
fn shortest_path() {
let code = r#"
//- /main.rs
pub mod foo;
pub mod baz;
struct S;
<|>
//- /foo.rs
pub mod bar { pub struct S; }
//- /baz.rs
pub use crate::foo::bar::S;
"#;
check_found_path(code, "baz::S");
}
}