[clang-format] Don't re-annotate CaseLabelColon as ConditionalExpr

[owenca]

Fixes #114627.

[llvmbot]

@llvm/pr-subscribers-clang-format

Author: Owen Pan (owenca)

Changes

Fixes #114627.

---

Full diff: https://github.com/llvm/llvm-project/pull/114639.diff

2 Files Affected:

• (modified) clang/lib/Format/TokenAnnotator.cpp (+1-1)
• (modified) clang/unittests/Format/FormatTest.cpp (+2)

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 13037b6d00604b..269cbef2720792 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1259,7 +1259,7 @@ class AnnotatingParser {
 
   bool parseConditional() {
     while (CurrentToken) {
-      if (CurrentToken->is(tok::colon)) {
+      if (CurrentToken->is(tok::colon) && CurrentToken->is(TT_Unknown)) {
         CurrentToken->setType(TT_ConditionalExpr);
         next();
         return true;
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index cdb68b74ca79ff..250e51b5421664 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -24393,6 +24393,8 @@ TEST_F(FormatTest, DisableRegions) {
 TEST_F(FormatTest, DoNotCrashOnInvalidInput) {
   format("? ) =");
   verifyNoCrash("#define a\\\n /**/}");
+  verifyNoCrash("        tst     %o5     ! are we doing the gray case?\n"
+                "LY52:                   ! [internal]");
 }
 
 TEST_F(FormatTest, FormatsTableGenCode) {