[clang] [clang-format] Fix a bug in annotating CastRParen (PR #102261)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-format

Author: Owen Pan (owenca)

<details>
<summary>Changes</summary>

Fixes #<!-- -->102102.

---
Full diff: https://github.com/llvm/llvm-project/pull/102261.diff


2 Files Affected:

- (modified) clang/lib/Format/TokenAnnotator.cpp (+10-1) 
- (modified) clang/unittests/Format/TokenAnnotatorTest.cpp (+7) 


``````````diff
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 4ed3e9d0e8e855..e1c9f37c6e8dc2 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -2874,9 +2874,18 @@ class AnnotatingParser {
       return false;
 
     // Search for unexpected tokens.
-    for (auto *Prev = BeforeRParen; Prev != LParen; Prev = Prev->Previous)
+    for (auto *Prev = BeforeRParen; Prev != LParen; Prev = Prev->Previous) {
+      if (Prev->is(tok::r_paren)) {
+        Prev = Prev->MatchingParen;
+        if (!Prev)
+          return false;
+        if (Prev->is(TT_FunctionTypeLParen))
+          break;
+        continue;
+      }
       if (!Prev->isOneOf(tok::kw_const, tok::identifier, tok::coloncolon))
         return false;
+    }
 
     return true;
   }
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index 6b71d0d18cf7a4..cbbe550a79ebc2 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -740,6 +740,13 @@ TEST_F(TokenAnnotatorTest, UnderstandsCasts) {
   EXPECT_TOKEN(Tokens[10], tok::r_paren, TT_Unknown);
   EXPECT_TOKEN(Tokens[11], tok::amp, TT_BinaryOperator);
 
+  Tokens = annotate("func((void (*)())&a);");
+  ASSERT_EQ(Tokens.size(), 15u) << Tokens;
+  EXPECT_TOKEN(Tokens[4], tok::l_paren, TT_FunctionTypeLParen);
+  EXPECT_TOKEN(Tokens[5], tok::star, TT_PointerOrReference);
+  EXPECT_TOKEN(Tokens[9], tok::r_paren, TT_CastRParen);
+  EXPECT_TOKEN(Tokens[10], tok::amp, TT_UnaryOperator);
+
   auto Style = getLLVMStyle();
   Style.TypeNames.push_back("Foo");
   Tokens = annotate("#define FOO(bar) foo((Foo)&bar)", Style);

``````````

</details>


https://github.com/llvm/llvm-project/pull/102261