1 files changed, 37 insertions, 44 deletions

diff --git a/crates/ra_ide_api/src/references/search_scope.rs b/crates/ra_ide_api/src/references/search_scope.rs
index 8495a92a5..5cb69b8fc 100644
--- a/crates/ra_ide_api/src/references/search_scope.rs
+++ b/crates/ra_ide_api/src/references/search_scope.rs
@@ -1,72 +1,66 @@
-//! FIXME: write short doc here
-
-use std::collections::HashSet;
+//! Generally, `search_scope` returns files that might contain references for the element.
+//! For `pub(crate)` things it's a crate, for `pub` things it's a crate and dependant crates.
+//! In some cases, the location of the references is known to within a `TextRange`,
+//! e.g. for things like local variables.
 
 use hir::{DefWithBody, HasSource, ModuleSource};
 use ra_db::{FileId, SourceDatabase, SourceDatabaseExt};
 use ra_syntax::{AstNode, TextRange};
+use rustc_hash::FxHashSet;
 
 use crate::db::RootDatabase;
 
 use super::{NameDefinition, NameKind};
 
 impl NameDefinition {
-    pub(crate) fn search_scope(&self, db: &RootDatabase) -> HashSet<(FileId, Option<TextRange>)> {
+    pub(crate) fn search_scope(&self, db: &RootDatabase) -> FxHashSet<(FileId, Option<TextRange>)> {
         let module_src = self.container.definition_source(db);
         let file_id = module_src.file_id.original_file(db);
 
         if let NameKind::Pat((def, _)) = self.kind {
+            let mut res = FxHashSet::default();
             let range = match def {
                 DefWithBody::Function(f) => f.source(db).ast.syntax().text_range(),
                 DefWithBody::Const(c) => c.source(db).ast.syntax().text_range(),
                 DefWithBody::Static(s) => s.source(db).ast.syntax().text_range(),
             };
-            return [(file_id, Some(range))].iter().cloned().collect();
+            res.insert((file_id, Some(range)));
+            return res;
         }
 
-        if let Some(ref vis) = self.visibility {
-            let vis = vis.syntax().to_string();
-
-            // FIXME: add "pub(in path)"
-
-            if vis.as_str() == "pub(super)" {
-                if let Some(parent_module) = self.container.parent(db) {
-                    let mut files = HashSet::new();
+        let vis =
+            self.visibility.as_ref().map(|v| v.syntax().to_string()).unwrap_or("".to_string());
 
-                    let parent_src = parent_module.definition_source(db);
-                    let file_id = parent_src.file_id.original_file(db);
+        if vis.as_str() == "pub(super)" {
+            if let Some(parent_module) = self.container.parent(db) {
+                let mut files = FxHashSet::default();
+                let parent_src = parent_module.definition_source(db);
+                let file_id = parent_src.file_id.original_file(db);
 
-                    match parent_src.ast {
-                        ModuleSource::Module(m) => {
-                            let range = Some(m.syntax().text_range());
-                            files.insert((file_id, range));
-                        }
-                        ModuleSource::SourceFile(_) => {
-                            files.insert((file_id, None));
-                            files.extend(
-                                parent_module
-                                    .children(db)
-                                    .map(|m| {
-                                        let src = m.definition_source(db);
-                                        (src.file_id.original_file(db), None)
-                                    })
-                                    .collect::<HashSet<_>>(),
-                            );
-                        }
+                match parent_src.ast {
+                    ModuleSource::Module(m) => {
+                        let range = Some(m.syntax().text_range());
+                        files.insert((file_id, range));
+                    }
+                    ModuleSource::SourceFile(_) => {
+                        files.insert((file_id, None));
+                        files.extend(parent_module.children(db).map(|m| {
+                            let src = m.definition_source(db);
+                            (src.file_id.original_file(db), None)
+                        }));
                     }
-                    return files;
-                } else {
-                    let range = match module_src.ast {
-                        ModuleSource::Module(m) => Some(m.syntax().text_range()),
-                        ModuleSource::SourceFile(_) => None,
-                    };
-                    return [(file_id, range)].iter().cloned().collect();
                 }
+                return files;
             }
+        }
 
+        if vis.as_str() != "" {
             let source_root_id = db.file_source_root(file_id);
             let source_root = db.source_root(source_root_id);
-            let mut files = source_root.walk().map(|id| (id.into(), None)).collect::<HashSet<_>>();
+            let mut files =
+                source_root.walk().map(|id| (id.into(), None)).collect::<FxHashSet<_>>();
+
+            // FIXME: add "pub(in path)"
 
             if vis.as_str() == "pub(crate)" {
                 return files;
@@ -74,10 +68,8 @@ impl NameDefinition {
             if vis.as_str() == "pub" {
                 let krate = self.container.krate(db).unwrap();
                 let crate_graph = db.crate_graph();
-
                 for crate_id in crate_graph.iter() {
                     let mut crate_deps = crate_graph.dependencies(crate_id);
-
                     if crate_deps.any(|dep| dep.crate_id() == krate.crate_id()) {
                         let root_file = crate_graph.crate_root(crate_id);
                         let source_root_id = db.file_source_root(root_file);
@@ -85,15 +77,16 @@ impl NameDefinition {
                         files.extend(source_root.walk().map(|id| (id.into(), None)));
                     }
                 }
-
                 return files;
             }
         }
 
+        let mut res = FxHashSet::default();
         let range = match module_src.ast {
             ModuleSource::Module(m) => Some(m.syntax().text_range()),
             ModuleSource::SourceFile(_) => None,
         };
-        [(file_id, range)].iter().cloned().collect()
+        res.insert((file_id, range));
+        res
     }
 }