1 files changed, 92 insertions, 0 deletions

diff --git a/crates/ra_ide_api/src/references/search_scope.rs b/crates/ra_ide_api/src/references/search_scope.rs
new file mode 100644
index 000000000..5cb69b8fc
--- /dev/null
+++ b/crates/ra_ide_api/src/references/search_scope.rs
@@ -0,0 +1,92 @@
+//! 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) -> 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(),
+            };
+            res.insert((file_id, Some(range)));
+            return res;
+        }
+
+        let vis =
+            self.visibility.as_ref().map(|v| v.syntax().to_string()).unwrap_or("".to_string());
+
+        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)
+                        }));
+                    }
+                }
+                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::<FxHashSet<_>>();
+
+            // FIXME: add "pub(in path)"
+
+            if vis.as_str() == "pub(crate)" {
+                return files;
+            }
+            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);
+                        let source_root = db.source_root(source_root_id);
+                        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,
+        };
+        res.insert((file_id, range));
+        res
+    }
+}