[clang-format] Don't misannotate in CTor init list

[HazardyKnusperkeks]

Summary

They were annotated with TrailingAnnotation, which they are not. And that resulted in some quirky formatting in some cases.

[owenpan]

clang/unittests/Format/TokenAnnotatorTest.cpp

1077–1079

Maybe instead (or in addition), check the tokens after the comma?

clang/lib/Format/TokenAnnotator.cpp

if (Current.is(Keywords.kw_instanceof)) {
                    TT_ObjCMethodSpecifier)) {
       // This is the first part of an Objective-C selector name. (If there's no
       // colon after this, this is the only place which annotates the identifier
       // as a selector.)
       Current.setType(TT_SelectorName);
     } else if (Current.isOneOf(tok::identifier, tok::kw_const, tok::kw_noexcept,
                                tok::kw_requires) &&
                Current.Previous &&
-               !Current.Previous->isOneOf(tok::equal, tok::at) &&
+               !Current.Previous->isOneOf(tok::equal, tok::at,
+                                          TT_CtorInitializerComma,
+                                          TT_CtorInitializerColon) &&
                Line.MightBeFunctionDecl && Contexts.size() == 1) {
       // Line.MightBeFunctionDecl can only be true after the parentheses of a
       // function declaration have been found.
       Current.setType(TT_TrailingAnnotation);
     } else if ((Style.Language == FormatStyle::LK_Java ||
                 Style.isJavaScript()) &&
                Current.Previous) {
       if (Current.Previous->is(tok::at) &&

clang/unittests/Format/TokenAnnotatorTest.cpp

Tokens = Annotate("case (x)\n"
                     "    x;\n"
                     "endcase\n");
   ASSERT_EQ(Tokens.size(), 14u) << Tokens;
   EXPECT_TOKEN(Tokens[5], tok::question, TT_ConditionalExpr);
   EXPECT_TOKEN(Tokens[7], tok::colon, TT_ConditionalExpr);
   EXPECT_TOKEN(Tokens[9], tok::colon, TT_GotoLabelColon);
 }
 
+TEST_F(TokenAnnotatorTest, UnderstandConstructors) {
+  auto Tokens = annotate("Class::Class() : BaseClass(), Member() {}");
+
+  // The TT_Unknown is clearly not binding for the future, please adapt if those
+  // tokens get annotated.
+  ASSERT_EQ(Tokens.size(), 16u) << Tokens;
+  EXPECT_TOKEN(Tokens[5], tok::colon, TT_CtorInitializerColon);
+  EXPECT_TOKEN(Tokens[6], tok::identifier, TT_Unknown);
+  EXPECT_TOKEN(Tokens[7], tok::l_paren, TT_Unknown);
+  EXPECT_TOKEN(Tokens[8], tok::r_paren, TT_Unknown);
+  EXPECT_TOKEN(Tokens[9], tok::comma, TT_CtorInitializerComma);
+  EXPECT_TOKEN(Tokens[13], tok::l_brace, TT_FunctionLBrace);
+
+  Tokens = annotate("Class::Class() : BaseClass{}, Member{} {}");
+  EXPECT_TOKEN(Tokens[5], tok::colon, TT_CtorInitializerColon);
+  EXPECT_TOKEN(Tokens[6], tok::identifier, TT_Unknown);
+  EXPECT_TOKEN(Tokens[7], tok::l_brace, TT_Unknown);
+  EXPECT_TOKEN(Tokens[8], tok::r_brace, TT_Unknown);
+  EXPECT_TOKEN(Tokens[9], tok::comma, TT_CtorInitializerComma);
+  EXPECT_TOKEN(Tokens[13], tok::l_brace, TT_FunctionLBrace);
+}
+
 } // namespace
 } // namespace format
 } // namespace clang