[clang] [clang-format] Fix a misannotation of less/greater as angle brackets (PR #105941)

[Owen Pan via cfe-commits]

https://github.com/owenca created https://github.com/llvm/llvm-project/pull/105941

Fixes #105877.

>From 28983f4532df55ee31fc366fb5a945594c0baf1a Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Sat, 24 Aug 2024 07:32:08 -0700
Subject: [PATCH] [clang-format] Fix a misannotation of less/greater as angle
 brackets

Fixes #105877.
---
 clang/lib/Format/TokenAnnotator.cpp           | 2 +-
 clang/unittests/Format/TokenAnnotatorTest.cpp | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 0d5741ed76f7cb..a570a909313f41 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -250,7 +250,7 @@ class AnnotatingParser {
         if (Precedence > prec::Conditional && Precedence < prec::Relational)
           return false;
       }
-      if (Prev.is(TT_ConditionalExpr))
+      if (Prev.isOneOf(tok::question, tok::colon) && !Style.isProto())
         SeenTernaryOperator = true;
       updateParameterCount(Left, CurrentToken);
       if (Style.Language == FormatStyle::LK_Proto) {
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index 99798de43e70ff..bb28b175eb5d50 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -620,6 +620,11 @@ TEST_F(TokenAnnotatorTest, UnderstandsNonTemplateAngleBrackets) {
   EXPECT_TOKEN(Tokens[2], tok::less, TT_BinaryOperator);
   EXPECT_TOKEN(Tokens[8], tok::greater, TT_BinaryOperator);
 
+  Tokens = annotate("return checklower ? a < b : a > b;");
+  ASSERT_EQ(Tokens.size(), 12u) << Tokens;
+  EXPECT_TOKEN(Tokens[4], tok::less, TT_BinaryOperator);
+  EXPECT_TOKEN(Tokens[8], tok::greater, TT_BinaryOperator);
+
   Tokens = annotate("return A < B ^ A > B;");
   ASSERT_EQ(Tokens.size(), 10u) << Tokens;
   EXPECT_TOKEN(Tokens[2], tok::less, TT_BinaryOperator);