From 11f19b784923ac701bc6fc39a6aea712f0091bf7 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Wed, 21 Nov 2018 17:51:02 +0300
Subject: name res uses paths

---
 .../src/completion/reference_completion.rs         | 64 ++++++++--------------
 1 file changed, 22 insertions(+), 42 deletions(-)

(limited to 'crates/ra_analysis/src/completion')

diff --git a/crates/ra_analysis/src/completion/reference_completion.rs b/crates/ra_analysis/src/completion/reference_completion.rs
index 84383b547..a96570415 100644
--- a/crates/ra_analysis/src/completion/reference_completion.rs
+++ b/crates/ra_analysis/src/completion/reference_completion.rs
@@ -10,8 +10,11 @@ use ra_syntax::{
 use crate::{
     db::RootDatabase,
     completion::CompletionItem,
-    descriptors::module::{ModuleDescriptor},
-    descriptors::function::FnScopes,
+    descriptors::{
+        module::{ModuleDescriptor},
+        function::FnScopes,
+        Path, PathKind,
+    },
     Cancelable
 };
 
@@ -55,7 +58,7 @@ pub(super) fn completions(
                     }),
             );
         }
-        NameRefKind::CratePath(path) => complete_path(acc, db, module, path)?,
+        NameRefKind::Path(path) => complete_path(acc, db, module, path)?,
         NameRefKind::BareIdentInMod => {
             let name_range = name_ref.syntax().range();
             let top_node = name_ref
@@ -79,8 +82,8 @@ enum NameRefKind<'a> {
     LocalRef {
         enclosing_fn: Option<ast::FnDef<'a>>,
     },
-    /// NameRef is the last segment in crate:: path
-    CratePath(Vec<ast::NameRef<'a>>),
+    /// NameRef is the last segment in some path
+    Path(Path),
     /// NameRef is bare identifier at the module's root.
     /// Used for keyword completion
     BareIdentInMod,
@@ -102,8 +105,10 @@ fn classify_name_ref(name_ref: ast::NameRef) -> Option<NameRefKind> {
     let parent = name_ref.syntax().parent()?;
     if let Some(segment) = ast::PathSegment::cast(parent) {
         let path = segment.parent_path();
-        if let Some(crate_path) = crate_path(path) {
-            return Some(NameRefKind::CratePath(crate_path));
+        if let Some(path) = Path::from_ast(path) {
+            if !path.is_ident() {
+                return Some(NameRefKind::Path(path));
+            }
         }
         if path.qualifier().is_none() {
             let enclosing_fn = name_ref
@@ -117,32 +122,6 @@ fn classify_name_ref(name_ref: ast::NameRef) -> Option<NameRefKind> {
     None
 }
 
-fn crate_path(mut path: ast::Path) -> Option<Vec<ast::NameRef>> {
-    let mut res = Vec::new();
-    loop {
-        let segment = path.segment()?;
-        match segment.kind()? {
-            ast::PathSegmentKind::Name(name) => res.push(name),
-            ast::PathSegmentKind::CrateKw => break,
-            ast::PathSegmentKind::SelfKw | ast::PathSegmentKind::SuperKw => return None,
-        }
-        path = qualifier(path)?;
-    }
-    res.reverse();
-    return Some(res);
-
-    fn qualifier(path: ast::Path) -> Option<ast::Path> {
-        if let Some(q) = path.qualifier() {
-            return Some(q);
-        }
-        // TODO: this bottom up traversal is not too precise.
-        // Should we handle do a top-down analysiss, recording results?
-        let use_tree_list = path.syntax().ancestors().find_map(ast::UseTreeList::cast)?;
-        let use_tree = use_tree_list.parent_use_tree();
-        use_tree.path()
-    }
-}
-
 fn complete_fn(name_ref: ast::NameRef, scopes: &FnScopes, acc: &mut Vec<CompletionItem>) {
     let mut shadowed = FxHashSet::default();
     acc.extend(
@@ -169,9 +148,9 @@ fn complete_path(
     acc: &mut Vec<CompletionItem>,
     db: &RootDatabase,
     module: &ModuleDescriptor,
-    crate_path: Vec<ast::NameRef>,
+    path: Path,
 ) -> Cancelable<()> {
-    let target_module = match find_target_module(module, crate_path) {
+    let target_module = match find_target_module(module, path) {
         None => return Ok(()),
         Some(it) => it,
     };
@@ -188,14 +167,15 @@ fn complete_path(
     Ok(())
 }
 
-fn find_target_module(
-    module: &ModuleDescriptor,
-    mut crate_path: Vec<ast::NameRef>,
-) -> Option<ModuleDescriptor> {
-    crate_path.pop();
+fn find_target_module(module: &ModuleDescriptor, path: Path) -> Option<ModuleDescriptor> {
+    if path.kind != PathKind::Crate {
+        return None;
+    }
+    let mut segments = path.segments;
+    segments.pop();
     let mut target_module = module.crate_root();
-    for name in crate_path {
-        target_module = target_module.child(name.text().as_str())?;
+    for name in segments {
+        target_module = target_module.child(&name)?;
     }
     Some(target_module)
 }
-- 
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