[clang-tidy/checks] Update objc-property-declaration check to allow arbitrary acronyms and initialisms 🔧

Summary:
§1 Description

This changes the objc-property-declaration check to allow arbitrary acronyms and initialisms instead of using whitelisted acronyms. In Objective-C it is relatively common to use project prefixes in property names for the purposes of disambiguation. For example, the CIColor¹ and CGColor² properties on UIColor both represent symbol prefixes being used in proeprty names outside of Apple's accepted acronyms³. The union of Apple's accepted acronyms and all symbol prefixes that might be used for disambiguation in property declarations effectively allows for any arbitrary sequence of capital alphanumeric characters to be acceptable in property declarations. This change updates the check accordingly.

The test variants with custom configurations are deleted as part of this change because their configurations no longer impact behavior. The acronym configurations are currently preserved for backwards compatibility of check configuration.

[1] https://developer.apple.com/documentation/uikit/uicolor/1621951-cicolor?language=objc
[2] https://developer.apple.com/documentation/uikit/uicolor/1621954-cgcolor?language=objc
[3] https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CodingGuidelines/Articles/APIAbbreviations.html#//apple_ref/doc/uid/20001285-BCIHCGAE

§2 Test Notes

Changes verified by:
• Running clang-tidy unit tests.
• Used check_clang_tidy.py to verify expected output of processing objc-property-declaration.m

Reviewers: benhamilton, Wizard

Reviewed By: benhamilton

Subscribers: jfb, cfe-commits

Differential Revision: https://reviews.llvm.org/D51832

3 files changed, 7 insertions, 33 deletions

diff --git a/clang-tools-extra/test/clang-tidy/objc-property-declaration-additional.m b/clang-tools-extra/test/clang-tidy/objc-property-declaration-additional.m
deleted file mode 100644
index bf836fa1869..00000000000
--- a/clang-tools-extra/test/clang-tidy/objc-property-declaration-additional.m
+++ /dev/null
@@ -1,15 +0,0 @@
-// RUN: %check_clang_tidy %s objc-property-declaration %t \
-// RUN: -config='{CheckOptions: \
-// RUN:  [{key: objc-property-declaration.Acronyms, value: "ABC;TGIF"}]}' \
-// RUN: --
-@class NSString;
-
-@interface Foo
-@property(assign, nonatomic) int AbcNotRealPrefix;
-// CHECK-MESSAGES: :[[@LINE-1]]:34: warning: property name 'AbcNotRealPrefix' 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 abcNotRealPrefix;
-@property(assign, nonatomic) int ABCCustomPrefix;
-@property(strong, nonatomic) NSString *ABC_custom_prefix;
-// CHECK-MESSAGES: :[[@LINE-1]]:40: warning: property name 'ABC_custom_prefix' not using lowerCamelCase style or not prefixed in a category, according to the Apple Coding Guidelines [objc-property-declaration]
-@property(assign, nonatomic) int GIFShouldIncludeStandardAcronym;
-@end
diff --git a/clang-tools-extra/test/clang-tidy/objc-property-declaration-custom.m b/clang-tools-extra/test/clang-tidy/objc-property-declaration-custom.m
deleted file mode 100644
index 68374ec0e8f..00000000000
--- a/clang-tools-extra/test/clang-tidy/objc-property-declaration-custom.m
+++ /dev/null
@@ -1,18 +0,0 @@
-// RUN: %check_clang_tidy %s objc-property-declaration %t \
-// RUN: -config='{CheckOptions: \
-// RUN:  [{key: objc-property-declaration.Acronyms, value: "ABC;TGIF"}, \
-// RUN:   {key: objc-property-declaration.IncludeDefaultAcronyms, value: 0}]}' \
-// RUN: --
-@class NSString;
-
-@interface Foo
-@property(assign, nonatomic) int AbcNotRealPrefix;
-// CHECK-MESSAGES: :[[@LINE-1]]:34: warning: property name 'AbcNotRealPrefix' 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 abcNotRealPrefix;
-@property(assign, nonatomic) int ABCCustomPrefix;
-@property(strong, nonatomic) NSString *ABC_custom_prefix;
-// CHECK-MESSAGES: :[[@LINE-1]]:40: warning: property name 'ABC_custom_prefix' not using lowerCamelCase style or not prefixed in a category, according to the Apple Coding Guidelines [objc-property-declaration]
-@property(assign, nonatomic) int GIFIgnoreStandardAcronym;
-// CHECK-MESSAGES: :[[@LINE-1]]:34: warning: property name 'GIFIgnoreStandardAcronym' not using lowerCamelCase style or not prefixed in a category, according to the Apple Coding Guidelines [objc-property-declaration]
-@property(strong, nonatomic) NSString *TGIF;
-@end
diff --git a/clang-tools-extra/test/clang-tidy/objc-property-declaration.m b/clang-tools-extra/test/clang-tidy/objc-property-declaration.m
index 26e2f9a5281..07a06205302 100644
--- a/clang-tools-extra/test/clang-tidy/objc-property-declaration.m
+++ b/clang-tools-extra/test/clang-tidy/objc-property-declaration.m
@@ -1,8 +1,12 @@
 // RUN: %check_clang_tidy %s objc-property-declaration %t
+@class CIColor;
+@class NSArray;
 @class NSData;
 @class NSString;
 @class UIViewController;
 
+typedef void *CGColorRef;
+
 @interface Foo
 @property(assign, nonatomic) int NotCamelCase;
 // CHECK-MESSAGES: :[[@LINE-1]]:34: warning: property name 'NotCamelCase' not using lowerCamelCase style or not prefixed in a category, according to the Apple Coding Guidelines [objc-property-declaration]
@@ -23,6 +27,9 @@
 @property(assign, nonatomic) int enableGLAcceleration;
 @property(assign, nonatomic) int ID;
 @property(assign, nonatomic) int hasADog;
+@property(nonatomic, readonly) CGColorRef CGColor;
+@property(nonatomic, readonly) CIColor *CIColor;
+@property(nonatomic, copy) NSArray *IDs;
 @end
 
 @interface Foo (Bar)