[llvm-branch-commits] [clang] release/19.x: [clang-format] Handle template opener/closer in braced list (#112494) (PR #112815)

[via llvm-branch-commits]

https://github.com/llvmbot created https://github.com/llvm/llvm-project/pull/112815

Backport 67f576f31d661897c5da302b8611decb7e0f9237

Requested by: @owenca

>From d2c97f90d9b1fe0d6f239c6bf6483632be05483e Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Thu, 17 Oct 2024 19:56:09 -0700
Subject: [PATCH] [clang-format] Handle template opener/closer in braced list
 (#112494)

Fixes #112487.

(cherry picked from commit 67f576f31d661897c5da302b8611decb7e0f9237)
---
 clang/lib/Format/UnwrappedLineParser.cpp      | 5 +++++
 clang/unittests/Format/TokenAnnotatorTest.cpp | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 631c7c62baac18..a5268e153bcc5b 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -2500,6 +2500,11 @@ bool UnwrappedLineParser::parseBracedList(bool IsAngleBracket, bool IsEnum) {
       // Assume there are no blocks inside a braced init list apart
       // from the ones we explicitly parse out (like lambdas).
       FormatTok->setBlockKind(BK_BracedInit);
+      if (!IsAngleBracket) {
+        auto *Prev = FormatTok->Previous;
+        if (Prev && Prev->is(tok::greater))
+          Prev->setFinalizedType(TT_TemplateCloser);
+      }
       nextToken();
       parseBracedList();
       break;
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index 6f3ef3b646c619..4acd900ff061f8 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -3404,6 +3404,12 @@ TEST_F(TokenAnnotatorTest, TemplateInstantiation) {
   ASSERT_EQ(Tokens.size(), 21u) << Tokens;
   EXPECT_TOKEN(Tokens[4], tok::less, TT_TemplateOpener);
   EXPECT_TOKEN(Tokens[16], tok::greater, TT_TemplateCloser);
+
+  Tokens =
+      annotate("auto x{std::conditional_t<T::value == U::value, T, U>{}};");
+  ASSERT_EQ(Tokens.size(), 24u) << Tokens;
+  EXPECT_TOKEN(Tokens[6], tok::less, TT_TemplateOpener);
+  EXPECT_TOKEN(Tokens[18], tok::greater, TT_TemplateCloser);
 }
 
 } // namespace