Merge #693

693: Name resolution refactoring r=matklad a=flodiebold

This is still very WIP, but it's becoming quite big and I want to make sure this isn't going in a completely bad direction :sweat_smile:. I'm not really happy with how the path resolution looks, and I'm not sure `PerNs<Resolution>` is the best return type -- there are 'this cannot happen in the (types/values) namespace' cases everywhere. I also want to unify the `resolver` and `nameres` namespaces once I'm done switching everything to `Resolver`. Also, `Resolver` only has a lifetime because it needs to have a reference to the `ItemMap` during import resolution :confused: 

The differences in the completion snapshots are almost completely just ordering (except it completes `Self` as well now), so I changed it to sort the completions before snapshotting.

Co-authored-by: Florian Diebold <[email protected]>

1 files changed, 31 insertions, 19 deletions

diff --git a/crates/ra_ide_api/src/goto_definition.rs b/crates/ra_ide_api/src/goto_definition.rs
index 2a20c20ee..88efcea2a 100644
--- a/crates/ra_ide_api/src/goto_definition.rs
+++ b/crates/ra_ide_api/src/goto_definition.rs
@@ -4,6 +4,7 @@ use ra_syntax::{
     algo::find_node_at_offset,
 };
 use test_utils::tested_by;
+use hir::Resolution;
 
 use crate::{FilePosition, NavigationTarget, db::RootDatabase, RangeInfo};
 
@@ -48,14 +49,7 @@ pub(crate) fn reference_definition(
     if let Some(function) =
         hir::source_binder::function_from_child_node(db, file_id, name_ref.syntax())
     {
-        let scope = function.scopes(db);
-        // First try to resolve the symbol locally
-        if let Some(entry) = scope.resolve_local_name(name_ref) {
-            let nav = NavigationTarget::from_scope_entry(file_id, &entry);
-            return Exact(nav);
-        };
-
-        // Next check if it is a method
+        // Check if it is a method
         if let Some(method_call) = name_ref
             .syntax()
             .parent()
@@ -86,19 +80,37 @@ pub(crate) fn reference_definition(
             };
         }
     }
-    // Then try module name resolution
-    if let Some(module) = hir::source_binder::module_from_child_node(db, file_id, name_ref.syntax())
+    // Try name resolution
+    let resolver = hir::source_binder::resolver_for_node(db, file_id, name_ref.syntax());
+    if let Some(path) = name_ref
+        .syntax()
+        .ancestors()
+        .find_map(ast::Path::cast)
+        .and_then(hir::Path::from_ast)
     {
-        if let Some(path) = name_ref
-            .syntax()
-            .ancestors()
-            .find_map(ast::Path::cast)
-            .and_then(hir::Path::from_ast)
-        {
-            let resolved = module.resolve_path(db, &path);
-            if let Some(def_id) = resolved.take_types().or(resolved.take_values()) {
-                return Exact(NavigationTarget::from_def(db, def_id));
+        let resolved = resolver.resolve_path(db, &path);
+        match resolved.clone().take_types().or(resolved.take_values()) {
+            Some(Resolution::Def(def)) => return Exact(NavigationTarget::from_def(db, def)),
+            Some(Resolution::LocalBinding(pat)) => {
+                let body = resolver.body().expect("no body for local binding");
+                let syntax_mapping = body.syntax_mapping(db);
+                let ptr = syntax_mapping
+                    .pat_syntax(pat)
+                    .expect("pattern not found in syntax mapping");
+                let name = path
+                    .as_ident()
+                    .cloned()
+                    .expect("local binding from a multi-segment path");
+                let nav = NavigationTarget::from_scope_entry(file_id, name, ptr);
+                return Exact(nav);
+            }
+            Some(Resolution::GenericParam(..)) => {
+                // TODO go to the generic param def
+            }
+            Some(Resolution::SelfType(_impl_block)) => {
+                // TODO go to the implemented type
             }
+            None => {}
         }
     }
     // If that fails try the index based approach.