[clang-format] Fix a bug in annotating ObjCMethodSpecifier (#127159)

Fixes #58202.

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -1313,7 +1313,7 @@ class AnnotatingParser {
     switch (bool IsIf = false; Tok->Tok.getKind()) {
     case tok::plus:
     case tok::minus:
-      if (!Tok->Previous && Line.MustBeDeclaration)
+      if (!Tok->getPreviousNonComment() && Line.MustBeDeclaration)
         Tok->setType(TT_ObjCMethodSpecifier);
       break;
     case tok::colon:

clang/unittests/Format/FormatTestObjC.cpp

@@ -567,6 +567,13 @@ TEST_F(FormatTestObjC, FormatObjCMethodDeclarations) {
                "                error:(NSError **)theError {\n"
                "}");
   verifyFormat("+ (instancetype)new;");
+
+  verifyFormat("/*\n"
+               " */\n"
+               "- (void)foo;",
+               "/*\n"
+               " */- (void)foo;");
+
   Style.ColumnLimit = 60;
   verifyFormat("- (instancetype)initXxxxxx:(id<x>)x\n"
                "                         y:(id<yyyyyyyyyyyyyyyyyyyy>)y\n"

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -1849,6 +1849,13 @@ TEST_F(TokenAnnotatorTest, UnderstandsObjCMethodExpr) {
   EXPECT_TOKEN(Tokens[15], tok::greater, TT_BinaryOperator);
 }
 
+TEST_F(TokenAnnotatorTest, UnderstandsObjCMethodDecl) {
+  auto Tokens = annotate("/**/ - (void)foo;");
+  ASSERT_EQ(Tokens.size(), 8u) << Tokens;
+  EXPECT_TOKEN(Tokens[1], tok::minus, TT_ObjCMethodSpecifier);
+  EXPECT_TOKEN(Tokens[5], tok::identifier, TT_SelectorName);
+}
+
 TEST_F(TokenAnnotatorTest, UnderstandsLambdas) {
   auto Tokens = annotate("[]() constexpr {}");
   ASSERT_EQ(Tokens.size(), 8u) << Tokens;