Add ModuleScope as a query

This is a first step towards queryifing completion and resolve.

Some code currently duplicates ra_editor: the plan is to move all
completion from ra_editor, but it'll take more than one commit.

1 files changed, 13 insertions, 1 deletions

diff --git a/crates/ra_analysis/src/descriptors/module/imp.rs b/crates/ra_analysis/src/descriptors/module/imp.rs
index aecf6e29a..5fdaad137 100644
--- a/crates/ra_analysis/src/descriptors/module/imp.rs
+++ b/crates/ra_analysis/src/descriptors/module/imp.rs
@@ -13,7 +13,7 @@ use crate::{
 };
 
 use super::{
-    ModuleData, ModuleTree, ModuleId, LinkId, LinkData, Problem, ModulesDatabase
+    ModuleData, ModuleTree, ModuleId, LinkId, LinkData, Problem, ModulesDatabase, ModuleScope
 };
 
 
@@ -35,6 +35,18 @@ pub(super) fn modules(root: ast::Root<'_>) -> impl Iterator<Item = (SmolStr, ast
     })
 }
 
+pub(super) fn module_scope(
+    db: &impl ModulesDatabase,
+    source_root_id: SourceRootId,
+    module_id: ModuleId,
+) -> Cancelable<Arc<ModuleScope>> {
+    let tree = db.module_tree(source_root_id)?;
+    let file_id = module_id.file_id(&tree);
+    let syntax = db.file_syntax(file_id);
+    let res = ModuleScope::new(&syntax);
+    Ok(Arc::new(res))
+}
+
 pub(super) fn module_tree(
     db: &impl ModulesDatabase,
     source_root: SourceRootId,