[clang-tidy] readability-identifier-naming - fix StructCase and UnionCase in C (#65202)

In C struct are visible as RecordDecl, not as CXXRecordDecl, this type
of declaration were not supported in this check before. Changing check
to support it. Added tests.

Fixes: #55422

3 files changed, 16 insertions, 4 deletions

diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/Inputs/identifier-naming/hungarian-notation1/.clang-tidy b/clang-tools-extra/test/clang-tidy/checkers/readability/Inputs/identifier-naming/hungarian-notation1/.clang-tidy
index fb68fa5..ff41479 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/Inputs/identifier-naming/hungarian-notation1/.clang-tidy
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/Inputs/identifier-naming/hungarian-notation1/.clang-tidy
@@ -1,6 +1,8 @@
 Checks: readability-identifier-naming
 CheckOptions:
   readability-identifier-naming.AbstractClassCase: CamelCase
+  readability-identifier-naming.StructCase: CamelCase
+  readability-identifier-naming.UnionCase: camelBack
   readability-identifier-naming.ClassCase: CamelCase
   readability-identifier-naming.ClassConstantCase: CamelCase
   readability-identifier-naming.ClassMemberCase: CamelCase
diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-hungarian-notation-c-language.c b/clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-hungarian-notation-c-language.c
index abd7e1b..dd82c11 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-hungarian-notation-c-language.c
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-hungarian-notation-c-language.c
@@ -63,9 +63,14 @@ struct MyStruct { int StructCase; };
 // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: invalid case style for public member 'StructCase' [readability-identifier-naming]
 // CHECK-FIXES: {{^}}struct MyStruct { int iStructCase; };
 
+struct shouldBeCamelCaseStruct { int iField; };
+// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: invalid case style for struct 'shouldBeCamelCaseStruct' [readability-identifier-naming]
+// CHECK-FIXES: {{^}}struct ShouldBeCamelCaseStruct { int iField; };
+
 union MyUnion { int UnionCase; long lUnionCase; };
-// CHECK-MESSAGES: :[[@LINE-1]]:21: warning: invalid case style for public member 'UnionCase' [readability-identifier-naming]
-// CHECK-FIXES: {{^}}union MyUnion { int iUnionCase; long lUnionCase; };
+// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: invalid case style for union 'MyUnion' [readability-identifier-naming]
+// CHECK-MESSAGES: :[[@LINE-2]]:21: warning: invalid case style for public member 'UnionCase' [readability-identifier-naming]
+// CHECK-FIXES: {{^}}union myUnion { int iUnionCase; long lUnionCase; };
 
 //===----------------------------------------------------------------------===//
 // C string
diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-hungarian-notation.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-hungarian-notation.cpp
index 10feff3..b974fae 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-hungarian-notation.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-hungarian-notation.cpp
@@ -115,9 +115,14 @@ struct MyStruct { int StructCase; };
 // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: invalid case style for public member 'StructCase' [readability-identifier-naming]
 // CHECK-FIXES: {{^}}struct MyStruct { int iStructCase; };
 
+struct shouldBeCamelCaseStruct { int iField; };
+// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: invalid case style for struct 'shouldBeCamelCaseStruct' [readability-identifier-naming]
+// CHECK-FIXES: {{^}}struct ShouldBeCamelCaseStruct { int iField; };
+
 union MyUnion { int UnionCase; long lUnionCase; };
-// CHECK-MESSAGES: :[[@LINE-1]]:21: warning: invalid case style for public member 'UnionCase' [readability-identifier-naming]
-// CHECK-FIXES: {{^}}union MyUnion { int iUnionCase; long lUnionCase; };
+// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: invalid case style for union 'MyUnion' [readability-identifier-naming]
+// CHECK-MESSAGES: :[[@LINE-2]]:21: warning: invalid case style for public member 'UnionCase' [readability-identifier-naming]
+// CHECK-FIXES: {{^}}union myUnion { int iUnionCase; long lUnionCase; };
 
 //===----------------------------------------------------------------------===//
 // C string