[clang] [clang-format] Fix a regression in annotating class decl braces (PR #93657)

[Owen Pan via cfe-commits]

https://github.com/owenca created https://github.com/llvm/llvm-project/pull/93657

Fixes #93604.

>From e853b7d6f13c152bfe57cec28a75507422f52edb Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Wed, 29 May 2024 00:49:10 -0700
Subject: [PATCH] [clang-format] Fix a regression in annotating class decl
 braces

Fixes #93604.
---
 clang/lib/Format/UnwrappedLineParser.cpp      | 3 +++
 clang/unittests/Format/TokenAnnotatorTest.cpp | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index b6f7567adc140..bf89def05bb2d 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -4026,6 +4026,9 @@ void UnwrappedLineParser::parseRecord(bool ParseAsExpr) {
       if (AngleNestingLevel == 0) {
         if (FormatTok->is(tok::colon)) {
           IsDerived = true;
+        } else if (FormatTok->is(tok::identifier) &&
+                   FormatTok->Previous->is(tok::coloncolon)) {
+          ClassName = FormatTok;
         } else if (FormatTok->is(tok::l_paren) &&
                    IsNonMacroIdentifier(FormatTok->Previous)) {
           break;
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index 6ea9c4a241dc5..3339a749df3a5 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -2914,6 +2914,11 @@ TEST_F(TokenAnnotatorTest, BraceKind) {
   EXPECT_BRACE_KIND(Tokens[5], BK_Block);
   EXPECT_BRACE_KIND(Tokens[6], BK_Block);
 
+  Tokens = annotate("struct Foo<int>::Bar {};");
+  ASSERT_EQ(Tokens.size(), 11u) << Tokens;
+  EXPECT_BRACE_KIND(Tokens[7], BK_Block);
+  EXPECT_BRACE_KIND(Tokens[8], BK_Block);
+
   Tokens = annotate("struct Foo<int> : Base {};");
   ASSERT_EQ(Tokens.size(), 11u) << Tokens;
   EXPECT_BRACE_KIND(Tokens[7], BK_Block);