[clangd] Suppress unwritten scopes when expanding auto.

Summary: otherwise the replacement will break the code.

Reviewers: sammccall

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64627

llvm-svn: 366446

clang-tools-extra/clangd/AST.cpp

@@ -192,6 +192,7 @@ std::string shortenNamespace(const llvm::StringRef OriginalName,
 
 std::string printType(const QualType QT, const DeclContext & Context){
   PrintingPolicy PP(Context.getParentASTContext().getPrintingPolicy());
+  PP.SuppressUnwrittenScope = 1;
   PP.SuppressTagKeyword = 1;
   return shortenNamespace(
       QT.getAsString(PP),

clang-tools-extra/clangd/AST.h

@@ -67,7 +67,8 @@ llvm::Optional<SymbolID> getSymbolID(const IdentifierInfo &II,
                                      const MacroInfo *MI,
                                      const SourceManager &SM);
 
-/// Returns a QualType as string.
+/// Returns a QualType as string. The result doesn't contain unwritten scopes
+/// like annoymous/inline namespace.
 std::string printType(const QualType QT, const DeclContext & Context);
 
 /// Try to shorten the OriginalName by removing namespaces from the left of

clang-tools-extra/clangd/unittests/TweakTests.cpp

@@ -663,6 +663,20 @@ TEST(TweakTest, ExpandAutoType) {
     const char * x = "test";
   )cpp";
   checkTransform(ID, Input, Output);
+
+  Input = R"cpp(
+  namespace {
+  class Foo {};
+  }
+  au^to f = Foo();
+  )cpp";
+  Output = R"cpp(
+  namespace {
+  class Foo {};
+  }
+  Foo f = Foo();
+  )cpp";
+  checkTransform(ID, Input, Output);
 }
 
 } // namespace