[clang-format] Handle C# goto case constructs

[owenca]

Fixes #113256.

[llvmbot]

@llvm/pr-subscribers-clang-format

Author: Owen Pan (owenca)

Changes

Fixes #113256.

---

Full diff: https://github.com/llvm/llvm-project/pull/113257.diff

2 Files Affected:

• (modified) clang/lib/Format/UnwrappedLineParser.cpp (+5)
• (modified) clang/unittests/Format/FormatTestCSharp.cpp (+19-9)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 4a5109983dfcc5..ebb9f4c7da8313 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -1568,6 +1568,11 @@ void UnwrappedLineParser::parseStructuralElement(
     }
     parseCaseLabel();
     return;
+  case tok::kw_goto:
+    nextToken();
+    if (FormatTok->is(tok::kw_case))
+      nextToken();
+    break;
   case tok::kw_try:
   case tok::kw___try:
     if (Style.isJavaScript() && Line->MustBeDeclaration) {
diff --git a/clang/unittests/Format/FormatTestCSharp.cpp b/clang/unittests/Format/FormatTestCSharp.cpp
index 0c5afa1524374d..151f7072e0c657 100644
--- a/clang/unittests/Format/FormatTestCSharp.cpp
+++ b/clang/unittests/Format/FormatTestCSharp.cpp
@@ -1689,15 +1689,25 @@ TEST_F(FormatTestCSharp, BrokenBrackets) {
 }
 
 TEST_F(FormatTestCSharp, GotoCaseLabel) {
-  verifyNoCrash("switch (i) {\n"
-                "case 0:\n"
-                "  goto case 1;\n"
-                "case 1:\n"
-                "  j = 0;\n"
-                "  {\n"
-                "    break;\n"
-                "  }\n"
-                "}");
+  verifyFormat("switch (i)\n"
+               "{\n"
+               "case 0:\n"
+               "    goto case 1;\n"
+               "case 1:\n"
+               "    j = 0;\n"
+               "    {\n"
+               "        break;\n"
+               "    }\n"
+               "}",
+               "switch (i) {\n"
+               "case 0:\n"
+               "  goto case 1;\n"
+               "case 1:\n"
+               "  j = 0;\n"
+               "  {\n"
+               "    break;\n"
+               "  }\n"
+               "}");
 }
 
 } // namespace