Move completion to ra_analysis

While we should handle completion for isolated file, it's better
achieved by using empty Analysis, rather than working only with &File:
we need memoization for type inference even inside a single file.

1 files changed, 5 insertions, 1 deletions

diff --git a/crates/ra_analysis/src/descriptors/module/scope.rs b/crates/ra_analysis/src/descriptors/module/scope.rs
index 0f8f325ab..846b8b44f 100644
--- a/crates/ra_analysis/src/descriptors/module/scope.rs
+++ b/crates/ra_analysis/src/descriptors/module/scope.rs
@@ -30,8 +30,12 @@ enum EntryKind {
 
 impl ModuleScope {
     pub fn new(file: &File) -> ModuleScope {
+        ModuleScope::from_items(file.ast().items())
+    }
+
+    pub fn from_items<'a>(items: impl Iterator<Item = ast::ModuleItem<'a>>) -> ModuleScope {
         let mut entries = Vec::new();
-        for item in file.ast().items() {
+        for item in items {
             let entry = match item {
                 ast::ModuleItem::StructDef(item) => Entry::new(item),
                 ast::ModuleItem::EnumDef(item) => Entry::new(item),