[clang] [clang-format] RemoveParentheses shouldn't remove empty parentheses (PR #138229)

[Owen Pan via cfe-commits]

https://github.com/owenca created https://github.com/llvm/llvm-project/pull/138229

Fix #138124

>From 9ba504b25f9afa79a155004c635d618a141c8c39 Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Thu, 1 May 2025 21:07:39 -0700
Subject: [PATCH] [clang-format] RemoveParentheses shouldn't remove empty
 parentheses

Fix #138124
---
 clang/lib/Format/UnwrappedLineParser.cpp | 3 ++-
 clang/unittests/Format/FormatTest.cpp    | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 837146f0c6483..b67634c7f8ee0 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -2599,7 +2599,8 @@ bool UnwrappedLineParser::parseParens(TokenType AmpAmpTokenType) {
       if (Prev) {
         auto OptionalParens = [&] {
           if (MightBeStmtExpr || MightBeFoldExpr || Line->InMacroBody ||
-              SeenComma || Style.RemoveParentheses == FormatStyle::RPS_Leave) {
+              SeenComma || Style.RemoveParentheses == FormatStyle::RPS_Leave ||
+              RParen->getPreviousNonComment() == LParen) {
             return false;
           }
           const bool DoubleParens =
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index c4fcc5506d152..049df57ab5725 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -28453,6 +28453,8 @@ TEST_F(FormatTest, RemoveParentheses) {
   verifyFormat("return ((... && std::is_convertible_v<TArgsLocal, TArgs>));",
                "return (((... && std::is_convertible_v<TArgsLocal, TArgs>)));",
                Style);
+  verifyFormat("MOCK_METHOD(void, Function, (), override);",
+               "MOCK_METHOD(void, Function, (), (override));", Style);
 
   Style.RemoveParentheses = FormatStyle::RPS_ReturnStatement;
   verifyFormat("#define Return0 return (0);", Style);