Handle visibility in method call completion

Author: flodiebold

crates/ra_hir/src/code_model.rs

@@ -571,6 +571,14 @@ impl Function {
     }
 }
 
+impl HasVisibility for Function {
+    fn visibility(&self, db: &impl HirDatabase) -> Visibility {
+        let function_data = db.function_data(self.id);
+        let visibility = &function_data.visibility;
+        visibility.resolve(db, &self.id.resolver(db))
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct Const {
     pub(crate) id: ConstId,

crates/ra_hir_def/src/data.rs

@@ -7,13 +7,16 @@ use hir_expand::{
     AstId, InFile,
 };
 use ra_prof::profile;
-use ra_syntax::ast::{self, AstNode, ImplItem, ModuleItemOwner, NameOwner, TypeAscriptionOwner};
+use ra_syntax::ast::{
+    self, AstNode, ImplItem, ModuleItemOwner, NameOwner, TypeAscriptionOwner, VisibilityOwner,
+};
 
 use crate::{
     db::DefDatabase,
     path::{path, GenericArgs, Path},
     src::HasSource,
     type_ref::{Mutability, TypeBound, TypeRef},
+    visibility::RawVisibility,
     AssocContainerId, AssocItemId, ConstId, ConstLoc, Expander, FunctionId, FunctionLoc, HasModule,
     ImplId, Intern, Lookup, ModuleId, StaticId, TraitId, TypeAliasId, TypeAliasLoc,
 };
@@ -26,6 +29,7 @@ pub struct FunctionData {
     /// True if the first param is `self`. This is relevant to decide whether this
     /// can be called as a method.
     pub has_self_param: bool,
+    pub visibility: RawVisibility,
 }
 
 impl FunctionData {
@@ -72,7 +76,9 @@ impl FunctionData {
             ret_type
         };
 
-        let sig = FunctionData { name, params, ret_type, has_self_param };
+        let visibility = RawVisibility::from_ast(db, src.map(|s| s.visibility()));
+
+        let sig = FunctionData { name, params, ret_type, has_self_param, visibility };
         Arc::new(sig)
     }
 }
@@ -230,7 +236,7 @@ impl ConstData {
         Arc::new(ConstData::new(&node))
     }
 
-    fn new<N: NameOwner + TypeAscriptionOwner>(node: &N) -> ConstData {
+    fn new<N: NameOwner + TypeAscriptionOwner + VisibilityOwner>(node: &N) -> ConstData {
         let name = node.name().map(|n| n.as_name());
         let type_ref = TypeRef::from_ast_opt(node.ascribed_type());
         ConstData { name, type_ref }

crates/ra_ide/src/completion/complete_dot.rs

@@ -57,7 +57,10 @@ fn complete_methods(acc: &mut Completions, ctx: &CompletionContext, receiver: &T
         let mut seen_methods = FxHashSet::default();
         let traits_in_scope = ctx.scope().traits_in_scope();
         receiver.iterate_method_candidates(ctx.db, krate, &traits_in_scope, None, |_ty, func| {
-            if func.has_self_param(ctx.db) && seen_methods.insert(func.name(ctx.db)) {
+            if func.has_self_param(ctx.db)
+                && ctx.scope().module().map_or(true, |m| func.is_visible_from(ctx.db, m))
+                && seen_methods.insert(func.name(ctx.db))
+            {
                 acc.add_function(ctx, func);
             }
             None::<()>
@@ -307,6 +310,39 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_method_completion_private() {
+        assert_debug_snapshot!(
+            do_ref_completion(
+                r"
+            struct A {}
+            mod m {
+                impl super::A {
+                    fn private_method(&self) {}
+                    pub(super) fn the_method(&self) {}
+                }
+            }
+            fn foo(a: A) {
+               a.<|>
+            }
+            ",
+            ),
+            @r###"
+        [
+            CompletionItem {
+                label: "the_method()",
+                source_range: [256; 256),
+                delete: [256; 256),
+                insert: "the_method()$0",
+                kind: Method,
+                lookup: "the_method",
+                detail: "pub(super) fn the_method(&self)",
+            },
+        ]
+        "###
+        );
+    }
+
     #[test]
     fn test_trait_method_completion() {
         assert_debug_snapshot!(