From 9ea6ee6b2785da02ff1963fbbc2eea340450905c Mon Sep 17 00:00:00 2001
From: Lukas Wirth <lukastw97@gmail.com>
Date: Wed, 16 Jun 2021 17:56:04 +0200
Subject: Don't show incorrect completions after unsafe or visiblity node

---
 crates/ide_completion/src/completions/keyword.rs | 22 ++++++++-------
 crates/ide_completion/src/completions/snippet.rs |  7 ++++-
 crates/ide_completion/src/context.rs             | 17 +++++++-----
 crates/ide_completion/src/tests/item_list.rs     | 34 +++++++-----------------
 4 files changed, 38 insertions(+), 42 deletions(-)

(limited to 'crates')

diff --git a/crates/ide_completion/src/completions/keyword.rs b/crates/ide_completion/src/completions/keyword.rs
index 0bfdf9603..7970e75c7 100644
--- a/crates/ide_completion/src/completions/keyword.rs
+++ b/crates/ide_completion/src/completions/keyword.rs
@@ -90,11 +90,13 @@ pub(crate) fn complete_expr_keyword(acc: &mut Completions, ctx: &CompletionConte
     }
 
     if expects_item || has_block_expr_parent {
+        if !ctx.has_visibility_prev_sibling() {
+            add_keyword("impl", "impl $1 {\n    $0\n}");
+            add_keyword("extern", "extern $0");
+        }
         add_keyword("use", "use $0");
-        add_keyword("impl", "impl $1 {\n    $0\n}");
         add_keyword("trait", "trait $1 {\n    $0\n}");
         add_keyword("static", "static $0");
-        add_keyword("extern", "extern $0");
         add_keyword("mod", "mod $0");
     }
 
@@ -241,11 +243,11 @@ mod tests {
                 kw fn
                 kw const
                 kw type
-                kw use
                 kw impl
+                kw extern
+                kw use
                 kw trait
                 kw static
-                kw extern
                 kw mod
                 kw match
                 kw while
@@ -269,11 +271,11 @@ mod tests {
                 kw fn
                 kw const
                 kw type
-                kw use
                 kw impl
+                kw extern
+                kw use
                 kw trait
                 kw static
-                kw extern
                 kw mod
                 kw match
                 kw while
@@ -297,11 +299,11 @@ mod tests {
                 kw fn
                 kw const
                 kw type
-                kw use
                 kw impl
+                kw extern
+                kw use
                 kw trait
                 kw static
-                kw extern
                 kw mod
                 kw match
                 kw while
@@ -399,11 +401,11 @@ fn quux() -> i32 {
                 kw fn
                 kw const
                 kw type
-                kw use
                 kw impl
+                kw extern
+                kw use
                 kw trait
                 kw static
-                kw extern
                 kw mod
                 kw match
                 kw while
diff --git a/crates/ide_completion/src/completions/snippet.rs b/crates/ide_completion/src/completions/snippet.rs
index 5560f1acf..4e64a0090 100644
--- a/crates/ide_completion/src/completions/snippet.rs
+++ b/crates/ide_completion/src/completions/snippet.rs
@@ -1,6 +1,7 @@
 //! This file provides snippet completions, like `pd` => `eprintln!(...)`.
 
 use ide_db::helpers::SnippetCap;
+use syntax::T;
 
 use crate::{
     context::PathCompletionContext, item::Builder, CompletionContext, CompletionItem,
@@ -35,9 +36,13 @@ pub(crate) fn complete_expr_snippet(acc: &mut Completions, ctx: &CompletionConte
 }
 
 pub(crate) fn complete_item_snippet(acc: &mut Completions, ctx: &CompletionContext) {
-    if !ctx.expects_item() {
+    if !ctx.expects_item() || ctx.previous_token_is(T![unsafe]) {
         return;
     }
+    if ctx.has_visibility_prev_sibling() {
+        return; // technically we could do some of these snippet completions if we were to put the
+                // attributes before the vis node.
+    }
     let cap = match ctx.config.snippet_cap {
         Some(it) => it,
         None => return,
diff --git a/crates/ide_completion/src/context.rs b/crates/ide_completion/src/context.rs
index 3885db702..907ffdc7a 100644
--- a/crates/ide_completion/src/context.rs
+++ b/crates/ide_completion/src/context.rs
@@ -311,13 +311,16 @@ impl<'a> CompletionContext<'a> {
     }
 
     pub(crate) fn is_path_disallowed(&self) -> bool {
-        matches!(
-            self.completion_location,
-            Some(ImmediateLocation::Attribute(_))
-                | Some(ImmediateLocation::ModDeclaration(_))
-                | Some(ImmediateLocation::RecordPat(_))
-                | Some(ImmediateLocation::RecordExpr(_))
-        ) || self.attribute_under_caret.is_some()
+        self.attribute_under_caret.is_some()
+            || self.previous_token_is(T![unsafe])
+            || self.has_visibility_prev_sibling()
+            || matches!(
+                self.completion_location,
+                Some(ImmediateLocation::Attribute(_))
+                    | Some(ImmediateLocation::ModDeclaration(_))
+                    | Some(ImmediateLocation::RecordPat(_))
+                    | Some(ImmediateLocation::RecordExpr(_))
+            )
     }
 
     pub(crate) fn expects_expression(&self) -> bool {
diff --git a/crates/ide_completion/src/tests/item_list.rs b/crates/ide_completion/src/tests/item_list.rs
index e7b77d7e7..c8aa44d88 100644
--- a/crates/ide_completion/src/tests/item_list.rs
+++ b/crates/ide_completion/src/tests/item_list.rs
@@ -16,11 +16,11 @@ fn in_mod_item_list() {
             kw fn
             kw const
             kw type
-            kw use
             kw impl
+            kw extern
+            kw use
             kw trait
             kw static
-            kw extern
             kw mod
             kw enum
             kw struct
@@ -51,11 +51,11 @@ $0"#,
             kw fn
             kw const
             kw type
-            kw use
             kw impl
+            kw extern
+            kw use
             kw trait
             kw static
-            kw extern
             kw mod
             kw enum
             kw struct
@@ -89,11 +89,11 @@ crate::$0"#,
             kw fn
             kw const
             kw type
-            kw use
             kw impl
+            kw extern
+            kw use
             kw trait
             kw static
-            kw extern
             kw mod
             kw enum
             kw struct
@@ -119,17 +119,11 @@ mod bar {}
 const CONST: () = ();
 
 unsafe $0"#,
-        expect![[r##"
+        expect![[r#"
             kw fn
             kw trait
             kw impl
-            sn tmod (Test module)
-            sn tfn (Test function)
-            sn macro_rules
-            md bar
-            ma foo!(…)          #[macro_export] macro_rules! foo
-            ma foo!(…)          #[macro_export] macro_rules! foo
-        "##]],
+        "#]],
     );
 }
 
@@ -145,26 +139,18 @@ mod bar {}
 const CONST: () = ();
 
 pub $0"#,
-        expect![[r##"
+        expect![[r#"
             kw unsafe
             kw fn
             kw const
             kw type
             kw use
-            kw impl
             kw trait
             kw static
-            kw extern
             kw mod
             kw enum
             kw struct
             kw union
-            sn tmod (Test module)
-            sn tfn (Test function)
-            sn macro_rules
-            md bar
-            ma foo!(…)          #[macro_export] macro_rules! foo
-            ma foo!(…)          #[macro_export] macro_rules! foo
-        "##]],
+        "#]],
     );
 }
-- 
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