[clang-format] Fix a bug in annotating class member names (llvm#165351)

For declarations like `Type* ::Class::member...`, `Class` was not
annotated as `TT_StartOfName`as it should be. This prevented `member`
from being updated to `TT_FunctionDeclarationName` if `member` was a
function name.

Fixes llvm#164866

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -2674,8 +2674,11 @@ class AnnotatingParser {
     }
 
     // *a or &a or &&a.
-    if (PreviousNotConst->is(TT_PointerOrReference))
+    if (PreviousNotConst->is(TT_PointerOrReference) ||
+        PreviousNotConst->endsSequence(tok::coloncolon,
+                                       TT_PointerOrReference)) {
       return true;
+    }
 
     // MyClass a;
     if (PreviousNotConst->isTypeName(LangOpts))

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -1119,6 +1119,11 @@ TEST_F(TokenAnnotatorTest, UnderstandsOverloadedOperators) {
   EXPECT_TOKEN(Tokens[8], tok::amp, TT_PointerOrReference);
   EXPECT_TOKEN(Tokens[12], tok::amp, TT_PointerOrReference);
 
+  Tokens = annotate("::foo::bar& ::foo::bar::operator=(::foo::bar& other);");
+  ASSERT_EQ(Tokens.size(), 22u) << Tokens;
+  EXPECT_TOKEN(Tokens[6], tok::identifier, TT_FunctionDeclarationName);
+  EXPECT_TOKEN(Tokens[17], tok::amp, TT_PointerOrReference);
+
   Tokens = annotate("SomeLoooooooooooooooooType::Awaitable\n"
                     "SomeLoooooooooooooooooType::operator co_await();");
   ASSERT_EQ(Tokens.size(), 11u) << Tokens;
@@ -3484,6 +3489,10 @@ TEST_F(TokenAnnotatorTest, StartOfName) {
   ASSERT_EQ(Tokens.size(), 8u) << Tokens;
   EXPECT_TOKEN(Tokens[2], tok::identifier, TT_Unknown); // Not StartOfName
 
+  Tokens = annotate("int* ::foo::bar;");
+  ASSERT_EQ(Tokens.size(), 8u) << Tokens;
+  EXPECT_TOKEN(Tokens[3], tok::identifier, TT_StartOfName);
+
   auto Style = getLLVMStyle();
   Style.StatementAttributeLikeMacros.push_back("emit");
   Tokens = annotate("emit foo = 0;", Style);