Fix the issue that not recognizing single acronym with prefix as ObjC property name.

[Wizard]

Summary

This will make clang-tidy accept property names like xyz_URL (URL is a common acronym).

[Wizard]

Format code.

[Wizard]

format change

clang-tidy/objc/PropertyDeclarationCheck.cpp

 
 void PropertyDeclarationCheck::check(const MatchFinder::MatchResult &Result) {
   const auto *MatchedDecl =
       Result.Nodes.getNodeAs<ObjCPropertyDecl>("property");
   assert(MatchedDecl->getName().size() > 0);
   auto *DeclContext = MatchedDecl->getDeclContext();
   auto *CategoryDecl = llvm::dyn_cast<ObjCCategoryDecl>(DeclContext);
 
-  auto AcronymsRegex =
-      llvm::Regex("^" + AcronymsGroupRegex(EscapedAcronyms) + "$");
-  if (AcronymsRegex.match(MatchedDecl->getName())) {
+  auto SingleAcronymRegex =
+      llvm::Regex("^([a-zA-Z]+_)?" + AcronymsGroupRegex(EscapedAcronyms) + "$");
+  if (SingleAcronymRegex.match(MatchedDecl->getName())) {
     return;
   }
   if (CategoryDecl != nullptr &&
       hasCategoryPropertyPrefix(MatchedDecl->getName())) {
     if (!prefixedPropertyNameValid(MatchedDecl->getName(), EscapedAcronyms) ||
         CategoryDecl->IsClassExtension()) {
       NamingStyle Style = CategoryDecl->IsClassExtension() ? StandardProperty
                                                            : CategoryProperty;

test/clang-tidy/objc-property-declaration.m

 // CHECK-FIXES: @property(assign, nonatomic) int abcd_camelCase;
 @property(assign, nonatomic) int abCD_NotCamelCase;
 // CHECK-MESSAGES: :[[@LINE-1]]:34: warning: property name 'abCD_NotCamelCase' not using lowerCamelCase style or not prefixed in a category, according to the Apple Coding Guidelines [objc-property-declaration]
 // CHECK-FIXES: @property(assign, nonatomic) int abcd_notCamelCase;
 @property(assign, nonatomic) int wrongFormat_;
 // CHECK-MESSAGES: :[[@LINE-1]]:34: warning: property name 'wrongFormat_' not using lowerCamelCase style or not prefixed in a category, according to the Apple Coding Guidelines [objc-property-declaration]
 @property(strong, nonatomic) NSString *URLStr;
 @property(assign, nonatomic) int abc_camelCase;
+@property(strong, nonatomic) NSString *abc_URL;
 @end
 
 @interface Foo ()
 @property(assign, nonatomic) int abc_inClassExtension;
 // CHECK-MESSAGES: :[[@LINE-1]]:34: warning: property name 'abc_inClassExtension' not using lowerCamelCase style or not prefixed in a category, according to the Apple Coding Guidelines [objc-property-declaration]
 @end
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