jaredgrubb updated this revision to Diff 520247.
jaredgrubb added a comment.

Update `ClangFormatStyleOptions.rst` as requested by the auto-comment (thanks 
auto-bot!).


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D150083/new/

https://reviews.llvm.org/D150083

Files:
  clang/docs/ClangFormatStyleOptions.rst
  clang/docs/ReleaseNotes.rst
  clang/docs/tools/clang-formatted-files.txt
  clang/include/clang/Format/Format.h
  clang/lib/Format/CMakeLists.txt
  clang/lib/Format/Format.cpp
  clang/lib/Format/ObjCPropertyAttributeOrderFixer.cpp
  clang/lib/Format/ObjCPropertyAttributeOrderFixer.h
  clang/lib/Format/QualifierAlignmentFixer.cpp
  clang/lib/Format/QualifierAlignmentFixer.h
  clang/unittests/Format/CMakeLists.txt
  clang/unittests/Format/ObjCPropertyAttributeOrderFixerTest.cpp
  llvm/utils/gn/secondary/clang/lib/Format/BUILD.gn
  llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
  utils/bazel/llvm-project-overlay/clang/BUILD.bazel

Index: utils/bazel/llvm-project-overlay/clang/BUILD.bazel
===================================================================
--- utils/bazel/llvm-project-overlay/clang/BUILD.bazel
+++ utils/bazel/llvm-project-overlay/clang/BUILD.bazel
@@ -1301,6 +1301,7 @@
         "lib/Format/FormatTokenLexer.h",
         "lib/Format/FormatTokenSource.h",
         "lib/Format/Macros.h",
+        "lib/Format/ObjCPropertyAttributeOrderFixer.h",
         "lib/Format/QualifierAlignmentFixer.h",
         "lib/Format/UnwrappedLineParser.h",
     ] + glob([
Index: llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
+++ llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
@@ -36,6 +36,7 @@
     "MacroCallReconstructorTest.cpp",
     "MacroExpanderTest.cpp",
     "NamespaceEndCommentsFixerTest.cpp",
+    "ObjCPropertyAttributeOrderFixerTest.cpp",
     "QualifierFixerTest.cpp",
     "SortImportsTestJS.cpp",
     "SortImportsTestJava.cpp",
Index: llvm/utils/gn/secondary/clang/lib/Format/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/clang/lib/Format/BUILD.gn
+++ llvm/utils/gn/secondary/clang/lib/Format/BUILD.gn
@@ -20,6 +20,7 @@
     "MacroCallReconstructor.cpp",
     "MacroExpander.cpp",
     "NamespaceEndCommentsFixer.cpp",
+    "ObjCPropertyAttributeOrderFixer.cpp",
     "QualifierAlignmentFixer.cpp",
     "SortJavaScriptImports.cpp",
     "TokenAnalyzer.cpp",
Index: clang/unittests/Format/ObjCPropertyAttributeOrderFixerTest.cpp
===================================================================
--- /dev/null
+++ clang/unittests/Format/ObjCPropertyAttributeOrderFixerTest.cpp
@@ -0,0 +1,192 @@
+//===- unittest/Format/ObjCPropertyAttributeOrderFixerTest.cpp - unit tests
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "../lib/Format/ObjCPropertyAttributeOrderFixer.h"
+#include "FormatTestBase.h"
+#include "TestLexer.h"
+
+#define DEBUG_TYPE "format-objc-property-attribute-order-fixer-test"
+
+namespace clang {
+namespace format {
+namespace test {
+namespace {
+
+#define CHECK_PARSE(TEXT, FIELD, VALUE)                                        \
+  EXPECT_NE(VALUE, Style.FIELD) << "Initial value already the same!";          \
+  EXPECT_EQ(0, parseConfiguration(TEXT, &Style).value());                      \
+  EXPECT_EQ(VALUE, Style.FIELD) << "Unexpected value after parsing!"
+
+#define FAIL_PARSE(TEXT, FIELD, VALUE)                                         \
+  EXPECT_NE(0, parseConfiguration(TEXT, &Style).value());                      \
+  EXPECT_EQ(VALUE, Style.FIELD) << "Unexpected value after parsing!"
+
+class ObjCPropertyAttributeOrderFixerTest : public FormatTestBase {
+protected:
+  TokenList annotate(llvm::StringRef Code,
+                     const FormatStyle &Style = getLLVMStyle()) {
+    return TestLexer(Allocator, Buffers, Style).annotate(Code);
+  }
+  llvm::SpecificBumpPtrAllocator<FormatToken> Allocator;
+  std::vector<std::unique_ptr<llvm::MemoryBuffer>> Buffers;
+};
+
+TEST_F(ObjCPropertyAttributeOrderFixerTest, ParsesStyleOption) {
+  FormatStyle Style = {};
+  Style.Language = FormatStyle::LK_ObjC;
+
+  CHECK_PARSE("ObjCPropertyAttributeOrder: [class]", ObjCPropertyAttributeOrder,
+              std::vector<std::string>({"class"}));
+
+  CHECK_PARSE("ObjCPropertyAttributeOrder: [direct, strong]",
+              ObjCPropertyAttributeOrder,
+              std::vector<std::string>({"direct", "strong"}));
+}
+
+TEST_F(ObjCPropertyAttributeOrderFixerTest, SortsSpecifiedAttributes) {
+  FormatStyle Style = getLLVMStyle();
+  Style.ObjCPropertyAttributeOrder = {"a", "b", "c"};
+
+  verifyFormat("@property() int p;", Style);
+
+  // One: shouldn't move.
+  verifyFormat("@property(a) int p;", Style);
+  verifyFormat("@property(b) int p;", Style);
+  verifyFormat("@property(c) int p;", Style);
+
+  // Two in correct order already: no change.
+  verifyFormat("@property(a, b) int p;", Style);
+  verifyFormat("@property(a, c) int p;", Style);
+  verifyFormat("@property(b, c) int p;", Style);
+
+  // Three in correct order already: no change.
+  verifyFormat("@property(a, b, c) int p;", Style);
+
+  // Two wrong order.
+  verifyFormat("@property(a, b) int p;", "@property(b, a) int p;", Style);
+  verifyFormat("@property(a, c) int p;", "@property(c, a) int p;", Style);
+  verifyFormat("@property(b, c) int p;", "@property(c, b) int p;", Style);
+
+  // Three wrong order.
+  verifyFormat("@property(a, b, c) int p;", "@property(b, a, c) int p;", Style);
+  verifyFormat("@property(a, b, c) int p;", "@property(c, b, a) int p;", Style);
+}
+
+TEST_F(ObjCPropertyAttributeOrderFixerTest, SortsAttributesWithValues) {
+  FormatStyle Style = getLLVMStyle();
+  Style.ObjCPropertyAttributeOrder = {"a", "getter", "c"};
+
+  // No change
+  verifyFormat("@property(getter=G, c) int p;", Style);
+  verifyFormat("@property(a, getter=G) int p;", Style);
+  verifyFormat("@property(a, getter=G, c) int p;", Style);
+
+  // Reorder
+  verifyFormat("@property(getter=G, c) int p;", "@property(c, getter=G) int p;",
+               Style);
+  verifyFormat("@property(a, getter=G) int p;", "@property(getter=G, a) int p;",
+               Style);
+  verifyFormat("@property(a, getter=G, c) int p;",
+               "@property(getter=G, c, a) int p;", Style);
+
+  // Multiple set properties, including ones not recognized
+  verifyFormat("@property(a=A, c=C, x=X, y=Y) int p;",
+               "@property(c=C, x=X, y=Y, a=A) int p;", Style);
+}
+
+TEST_F(ObjCPropertyAttributeOrderFixerTest, SortsUnspecifiedAttributesToBack) {
+  FormatStyle Style = getLLVMStyle();
+  Style.ObjCPropertyAttributeOrder = {"a", "b", "c"};
+
+  verifyFormat("@property(x) int p;", Style);
+
+  // No change in order.
+  verifyFormat("@property(a, x, y) int p;", Style);
+  verifyFormat("@property(b, x, y) int p;", Style);
+  verifyFormat("@property(a, b, c, x, y) int p;", Style);
+
+  // Reorder one unrecognized one.
+  verifyFormat("@property(a, x) int p;", "@property(x, a) int p;", Style);
+
+  // Prove the unrecognized ones have a stable sort order
+  verifyFormat("@property(a, b, x, y) int p;", "@property(x, b, y, a) int p;",
+               Style);
+  verifyFormat("@property(a, b, y, x) int p;", "@property(y, b, x, a) int p;",
+               Style);
+}
+
+TEST_F(ObjCPropertyAttributeOrderFixerTest, RemovesDuplicateAttributes) {
+  FormatStyle Style = getLLVMStyle();
+  Style.ObjCPropertyAttributeOrder = {"a", "b", "c"};
+
+  verifyFormat("@property(a) int p;", "@property(a, a) int p;", Style);
+  verifyFormat("@property(a) int p;", "@property(a, a, a, a) int p;", Style);
+
+  verifyFormat("@property(a, b, c) int p;",
+               "@property(c, b, a, b, a, c) int p;", Style);
+
+  verifyFormat("@property(a, b, c, x, y) int p;",
+               "@property(c, x, b, a, y, b, a, c, y) int p;", Style);
+}
+
+TEST_F(ObjCPropertyAttributeOrderFixerTest, HandlesClassAttribute) {
+  // 'class' is the only attribute that is a keyword, so make sure it works too.
+  FormatStyle Style = getLLVMStyle();
+  Style.ObjCPropertyAttributeOrder = {"a", "class", "c"};
+
+  // No change
+  verifyFormat("@property(class, c) int p;", Style);
+  verifyFormat("@property(a, class) int p;", Style);
+  verifyFormat("@property(a, class, c) int p;", Style);
+
+  // Reorder
+  verifyFormat("@property(class, c) int p;", "@property(c, class) int p;",
+               Style);
+  verifyFormat("@property(a, class) int p;", "@property(class, a) int p;",
+               Style);
+  verifyFormat("@property(a, class, c) int p;", "@property(class, c, a) int p;",
+               Style);
+}
+
+TEST_F(ObjCPropertyAttributeOrderFixerTest, HandlesCommentsAroundAttributes) {
+  FormatStyle Style = getLLVMStyle();
+  Style.ObjCPropertyAttributeOrder = {"a", "b", "c"};
+
+  // Handle zero attributes but comments.
+  verifyFormat("@property(/* 1 */) int p;", Style);
+  verifyFormat("@property(/* 1 */ /* 2 */) int p;", Style);
+
+  // Handle one attribute with comments before or after.
+  verifyFormat("@property(/* 1 */ a) int p;", Style);
+  verifyFormat("@property(a /* 2 */) int p;", Style);
+  verifyFormat("@property(/* 1 */ a /* 2 */) int p;", Style);
+
+  // Handle reordering with comments, before or after or both.
+  verifyFormat("@property(/* 1 */ a, b, x, y) int p;",
+               "@property(/* 1 */ x, b, a, y) int p;", Style);
+
+  verifyFormat("@property(a, b, x, y /* 2 */) int p;",
+               "@property(x, b, a, y /* 2 */) int p;", Style);
+
+  verifyFormat("@property(/* 1 */ a, b, x, y /* 2 */) int p;",
+               "@property(/* 1 */ x, b, a, y /* 2 */) int p;", Style);
+
+  verifyFormat("@property(/* 1 */ /* 2 */ a, b, x, y /* 3 */ /* 4 */) int p;",
+               "@property(/* 1 *//* 2 */ x,b,a,y /* 3 *//* 4 */) int p;",
+               Style);
+
+  // Comments between properties cause the pass to bail.
+  verifyFormat("@property(a, /* 1 */ b) int p;", Style);
+  verifyFormat("@property(b, /* 1 */ a) int p;", Style);
+  verifyFormat("@property(b /* 1 */, a) int p;", Style);
+}
+
+} // namespace
+} // namespace test
+} // namespace format
+} // namespace clang
Index: clang/unittests/Format/CMakeLists.txt
===================================================================
--- clang/unittests/Format/CMakeLists.txt
+++ clang/unittests/Format/CMakeLists.txt
@@ -28,6 +28,7 @@
   MacroCallReconstructorTest.cpp
   MacroExpanderTest.cpp
   NamespaceEndCommentsFixerTest.cpp
+  ObjCPropertyAttributeOrderFixerTest.cpp
   QualifierFixerTest.cpp
   SortImportsTestJS.cpp
   SortImportsTestJava.cpp
Index: clang/lib/Format/QualifierAlignmentFixer.h
===================================================================
--- clang/lib/Format/QualifierAlignmentFixer.h
+++ clang/lib/Format/QualifierAlignmentFixer.h
@@ -1,4 +1,4 @@
-//===--- LeftRightQualifierAlignmentFixer.h ------------------------------*- C++
+//===--- QualifierAlignmentFixer.h ------------------------------*- C++
 //-*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
@@ -8,7 +8,7 @@
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// This file declares LeftRightQualifierAlignmentFixer, a TokenAnalyzer that
+/// This file declares QualifierAlignmentFixer, a TokenAnalyzer that
 /// enforces either east or west const depending on the style.
 ///
 //===----------------------------------------------------------------------===//
Index: clang/lib/Format/QualifierAlignmentFixer.cpp
===================================================================
--- clang/lib/Format/QualifierAlignmentFixer.cpp
+++ clang/lib/Format/QualifierAlignmentFixer.cpp
@@ -1,4 +1,4 @@
-//===--- LeftRightQualifierAlignmentFixer.cpp -------------------*- C++--*-===//
+//===--- QualifierAlignmentFixer.cpp ----------------------------*- C++--*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// This file implements LeftRightQualifierAlignmentFixer, a TokenAnalyzer that
+/// This file implements QualifierAlignmentFixer, a TokenAnalyzer that
 /// enforces either left or right const depending on the style.
 ///
 //===----------------------------------------------------------------------===//
@@ -248,7 +248,7 @@
     // The cases:
     // `Foo() const` -> `Foo() const`
     // `Foo() const final` -> `Foo() const final`
-    // `Foo() const override` -> `Foo() const final`
+    // `Foo() const override` -> `Foo() const override`
     // `Foo() const volatile override` -> `Foo() const volatile override`
     // `Foo() volatile const final` -> `Foo() const volatile final`
     if (PreviousCheck->is(tok::r_paren))
Index: clang/lib/Format/ObjCPropertyAttributeOrderFixer.h
===================================================================
--- /dev/null
+++ clang/lib/Format/ObjCPropertyAttributeOrderFixer.h
@@ -0,0 +1,53 @@
+//===--- ObjCPropertyAttributeOrderFixer.h ------------------------------*- C++
+//-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file declares ObjCPropertyAttributeOrderFixer, a TokenAnalyzer that
+/// adjusts the order of attributes in an ObjC `@property(...)` declaration,
+/// depending on the style.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_FORMAT_OBJCPROPERTYATTRIBUTEORDERFIXER_H
+#define LLVM_CLANG_LIB_FORMAT_OBJCPROPERTYATTRIBUTEORDERFIXER_H
+
+#include "TokenAnalyzer.h"
+#include "llvm/ADT/StringMap.h"
+
+namespace clang {
+namespace format {
+
+class ObjCPropertyAttributeOrderFixer : public TokenAnalyzer {
+  llvm::StringMap<unsigned> SortOrderMap;
+  unsigned SortOrderMax;
+
+  const FormatToken *analyzeObjCPropertyDecl(const SourceManager &SourceMgr,
+                                             const AdditionalKeywords &Keywords,
+                                             tooling::Replacements &Fixes,
+                                             const FormatToken *Tok) const;
+
+  void sortPropertyAttributes(const SourceManager &SourceMgr,
+                              tooling::Replacements &Fixes,
+                              const FormatToken *LParenTok,
+                              const FormatToken *RParenTok) const;
+
+public:
+  ObjCPropertyAttributeOrderFixer(const Environment &Env,
+                                  const FormatStyle &Style);
+
+  std::pair<tooling::Replacements, unsigned>
+  analyze(TokenAnnotator &Annotator,
+          SmallVectorImpl<AnnotatedLine *> &AnnotatedLines,
+          FormatTokenLexer &Tokens) override;
+};
+
+} // end namespace format
+} // end namespace clang
+
+#endif
Index: clang/lib/Format/ObjCPropertyAttributeOrderFixer.cpp
===================================================================
--- /dev/null
+++ clang/lib/Format/ObjCPropertyAttributeOrderFixer.cpp
@@ -0,0 +1,198 @@
+//===--- ObjCPropertyAttributeOrderFixer.cpp -------------------*- C++--*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file implements ObjCPropertyAttributeOrderFixer, a TokenAnalyzer that
+/// adjusts the order of attributes in an ObjC `@property(...)` declaration,
+/// depending on the style.
+///
+//===----------------------------------------------------------------------===//
+
+#include "ObjCPropertyAttributeOrderFixer.h"
+
+#include "FormatToken.h"
+#include "llvm/ADT/Sequence.h"
+#include "llvm/Support/Debug.h"
+
+#include <algorithm>
+
+#define DEBUG_TYPE "format-objc-property-attribute-order-fixer"
+
+namespace clang {
+namespace format {
+
+ObjCPropertyAttributeOrderFixer::ObjCPropertyAttributeOrderFixer(
+    const Environment &Env, const FormatStyle &Style)
+    : TokenAnalyzer(Env, Style) {
+
+  // Create an "order priority" map to use to sort properties.
+  unsigned index = 0;
+  for (auto const &Property : Style.ObjCPropertyAttributeOrder)
+    SortOrderMap[Property] = index++;
+  // A sentinel value bigger than all others (used to sort unknown ones to the
+  // end).
+  SortOrderMax = index;
+}
+
+struct ObjCPropertyEntry {
+  StringRef attribute; // eg, "readwrite"
+  StringRef value;     // eg, the "foo" of the attribute "getter=foo"
+};
+
+void ObjCPropertyAttributeOrderFixer::sortPropertyAttributes(
+    const SourceManager &SourceMgr, tooling::Replacements &Fixes,
+    const FormatToken *LParenTok, const FormatToken *RParenTok) const {
+  // Skip past any leading comments.
+  const FormatToken *const BeginTok = LParenTok->getNextNonComment();
+
+  // Block out any trailing comments. ("End" marks a left-closed interval, so
+  // store one-past-last) This will point to either the right-paren, or a
+  // comment (if there were multiple trailing comments).
+  const FormatToken *const EndTok = RParenTok->getPreviousNonComment()->Next;
+  assert(EndTok->isOneOf(tok::r_paren, tok::comment) &&
+         "Expect the range to be bounded by comment or paren");
+
+  // If there are zero or one elements, nothing to do.
+  if (BeginTok == EndTok || BeginTok->Next == EndTok)
+    return;
+
+  // Collect the attributes.
+  SmallVector<ObjCPropertyEntry, 8> PropertyAttributes;
+  for (auto Tok = BeginTok; Tok != EndTok; Tok = Tok->Next) {
+    if (Tok->is(tok::comma)) {
+      // Ignore the comma separators.
+      continue;
+    } else if (Tok->isOneOf(tok::identifier, tok::kw_class)) {
+      // Memoize the attribute. (Note that 'class' is a legal attribute!)
+      PropertyAttributes.push_back({Tok->TokenText.trim(), StringRef{}});
+
+      // Also handle `getter=getFoo` attributes.
+      // (Note: no check needed against `EndTok`, since its type is not
+      // BinaryOperator or Identifier)
+      if (Tok->Next->is(tok::equal)) {
+        Tok = Tok->Next;
+        if (Tok->Next->is(tok::identifier)) {
+          Tok = Tok->Next;
+          PropertyAttributes.back().value = Tok->TokenText.trim();
+        } else {
+          // If we hit any other kind of token, just bail. It's unusual/illegal.
+          return;
+        }
+      }
+    } else {
+      // If we hit any other kind of token, just bail.
+      return;
+    }
+  }
+
+  // Create a "remapping index" on how to reorder the attributes.
+  SmallVector<unsigned, 8> Indices =
+      llvm::to_vector<8>(llvm::seq<unsigned>(0, PropertyAttributes.size()));
+
+  // Sort the indices based on the priority stored in 'SortOrderMap'; use Max
+  // for missing values.
+  auto sortIndex = [&](const StringRef &needle) -> unsigned {
+    auto i = SortOrderMap.find(needle);
+    return (i == SortOrderMap.end()) ? SortOrderMax : i->getValue();
+  };
+  llvm::stable_sort(Indices, [&](unsigned LHSI, unsigned RHSI) {
+    return sortIndex(PropertyAttributes[LHSI].attribute) <
+           sortIndex(PropertyAttributes[RHSI].attribute);
+  });
+
+  // Deduplicate the attributes.
+  Indices.erase(std::unique(Indices.begin(), Indices.end(),
+                            [&](unsigned LHSI, unsigned RHSI) {
+                              return PropertyAttributes[LHSI].attribute ==
+                                     PropertyAttributes[RHSI].attribute;
+                            }),
+                Indices.end());
+
+  // If there are no removals or shuffling, then don't suggest any fixup.
+  if (Indices.size() == PropertyAttributes.size() && llvm::is_sorted(Indices))
+    return;
+
+  // Generate the replacement text.
+  std::string NewText;
+  for (unsigned Index : Indices) {
+    if (!NewText.empty())
+      NewText += ", ";
+    NewText += PropertyAttributes[Index].attribute;
+    if (!PropertyAttributes[Index].value.empty()) {
+      NewText += "=";
+      NewText += PropertyAttributes[Index].value;
+    }
+  }
+
+  auto Range = CharSourceRange::getCharRange(
+      BeginTok->getStartOfNonWhitespace(), EndTok->Previous->Tok.getEndLoc());
+  auto Replacement = tooling::Replacement(SourceMgr, Range, NewText);
+  auto Err = Fixes.add(Replacement);
+  if (Err) {
+    llvm::errs() << "Error while reodering ObjC property attributes : "
+                 << llvm::toString(std::move(Err)) << "\n";
+  }
+}
+
+const FormatToken *ObjCPropertyAttributeOrderFixer::analyzeObjCPropertyDecl(
+    const SourceManager &SourceMgr, const AdditionalKeywords &Keywords,
+    tooling::Replacements &Fixes, const FormatToken *const Tok) const {
+  // Expect `property` to be the very next token or else just bail early.
+  const FormatToken *const PropertyTok = Tok->Next;
+  if (!PropertyTok || PropertyTok->TokenText != "property")
+    return Tok;
+
+  // Expect the opening paren to be the next token or else just bail early.
+  const FormatToken *const LParenTok = PropertyTok->getNextNonComment();
+  if (!LParenTok || LParenTok->isNot(tok::l_paren))
+    return Tok;
+
+  // Get the matching right-paren, the bounds for property attributes.
+  const FormatToken *const RParenTok = LParenTok->MatchingParen;
+  if (!RParenTok)
+    return Tok;
+
+  sortPropertyAttributes(SourceMgr, Fixes, LParenTok, RParenTok);
+
+  // Return the final token since we can skip past everything in between.
+  return RParenTok;
+}
+
+std::pair<tooling::Replacements, unsigned>
+ObjCPropertyAttributeOrderFixer::analyze(
+    TokenAnnotator & /*Annotator*/,
+    SmallVectorImpl<AnnotatedLine *> &AnnotatedLines,
+    FormatTokenLexer &Tokens) {
+  tooling::Replacements Fixes;
+  const AdditionalKeywords &Keywords = Tokens.getKeywords();
+  const SourceManager &SourceMgr = Env.getSourceManager();
+  AffectedRangeMgr.computeAffectedLines(AnnotatedLines);
+
+  for (AnnotatedLine *Line : AnnotatedLines) {
+    if (!Line->Affected || Line->InPPDirective)
+      continue;
+    FormatToken *First = Line->First;
+    assert(First);
+    if (First->Finalized)
+      continue;
+
+    const auto *Last = Line->Last;
+
+    for (const auto *Tok = First; Tok && Tok != Last && Tok->Next;
+         Tok = Tok->Next) {
+      // Skip until the `@` of a `@property` declaration.
+      if (Tok->isNot(TT_ObjCProperty))
+        continue;
+      Tok = analyzeObjCPropertyDecl(SourceMgr, Keywords, Fixes, Tok);
+    }
+  }
+  return {Fixes, 0};
+}
+
+} // namespace format
+} // namespace clang
Index: clang/lib/Format/Format.cpp
===================================================================
--- clang/lib/Format/Format.cpp
+++ clang/lib/Format/Format.cpp
@@ -22,6 +22,7 @@
 #include "FormatTokenLexer.h"
 #include "IntegerLiteralSeparatorFixer.h"
 #include "NamespaceEndCommentsFixer.h"
+#include "ObjCPropertyAttributeOrderFixer.h"
 #include "QualifierAlignmentFixer.h"
 #include "SortJavaScriptImports.h"
 #include "TokenAnalyzer.h"
@@ -952,6 +953,8 @@
     IO.mapOptional("ObjCBlockIndentWidth", Style.ObjCBlockIndentWidth);
     IO.mapOptional("ObjCBreakBeforeNestedBlockParam",
                    Style.ObjCBreakBeforeNestedBlockParam);
+    IO.mapOptional("ObjCPropertyAttributeOrder",
+                   Style.ObjCPropertyAttributeOrder);
     IO.mapOptional("ObjCSpaceAfterProperty", Style.ObjCSpaceAfterProperty);
     IO.mapOptional("ObjCSpaceBeforeProtocolList",
                    Style.ObjCSpaceBeforeProtocolList);
@@ -3482,6 +3485,12 @@
       });
     }
 
+    if (!Style.ObjCPropertyAttributeOrder.empty()) {
+      Passes.emplace_back([&](const Environment &Env) {
+        return ObjCPropertyAttributeOrderFixer(Env, Expanded).process();
+      });
+    }
+
     if (Style.InsertBraces) {
       FormatStyle S = Expanded;
       S.InsertBraces = true;
Index: clang/lib/Format/CMakeLists.txt
===================================================================
--- clang/lib/Format/CMakeLists.txt
+++ clang/lib/Format/CMakeLists.txt
@@ -12,6 +12,7 @@
   MacroCallReconstructor.cpp
   MacroExpander.cpp
   NamespaceEndCommentsFixer.cpp
+  ObjCPropertyAttributeOrderFixer.cpp
   QualifierAlignmentFixer.cpp
   SortJavaScriptImports.cpp
   TokenAnalyzer.cpp
Index: clang/include/clang/Format/Format.h
===================================================================
--- clang/include/clang/Format/Format.h
+++ clang/include/clang/Format/Format.h
@@ -2986,6 +2986,29 @@
   /// \version 11
   bool ObjCBreakBeforeNestedBlockParam;
 
+  /// The order in which property attributes should appear, such as:
+  ///
+  ///   * class
+  ///   * direct
+  ///   * atomic, nonatomic
+  ///   * assign, retain, strong, copy, weak, unsafe_unretained
+  ///   * readonly, readwrite
+  ///   * getter, setter
+  ///   * nullable, nonnull, null_resettable, null_unspecified
+  ///
+  /// Attributes in code will be sorted in the order specified. Any attributes
+  /// encountered that are not mentioned in this array will be sorted last, in
+  /// stable order. Duplicate attributes will be removed, but no other conflict
+  /// checking is performed. A leading or trailing comment is allowed to the
+  /// whole set, but comments encountered between attributes will leave the
+  /// entire set untouched.
+  ///
+  /// \code{.yaml}
+  ///   ObjCPropertyAttributeOrder: [nonatomic, strong, readwrite, nullable]
+  /// \endcode
+  /// \version 17
+  std::vector<std::string> ObjCPropertyAttributeOrder;
+
   /// Add a space after ``@property`` in Objective-C, i.e. use
   /// ``@property (readonly)`` instead of ``@property(readonly)``.
   /// \version 3.7
@@ -4379,6 +4402,7 @@
            ObjCBlockIndentWidth == R.ObjCBlockIndentWidth &&
            ObjCBreakBeforeNestedBlockParam ==
                R.ObjCBreakBeforeNestedBlockParam &&
+           ObjCPropertyAttributeOrder == R.ObjCPropertyAttributeOrder &&
            ObjCSpaceAfterProperty == R.ObjCSpaceAfterProperty &&
            ObjCSpaceBeforeProtocolList == R.ObjCSpaceBeforeProtocolList &&
            PackConstructorInitializers == R.PackConstructorInitializers &&
Index: clang/docs/tools/clang-formatted-files.txt
===================================================================
--- clang/docs/tools/clang-formatted-files.txt
+++ clang/docs/tools/clang-formatted-files.txt
@@ -458,6 +458,8 @@
 clang/lib/Format/Macros.h
 clang/lib/Format/NamespaceEndCommentsFixer.cpp
 clang/lib/Format/NamespaceEndCommentsFixer.h
+clang/lib/Format/ObjCPropertyAttributeOrderFixer.h
+clang/lib/Format/ObjCPropertyAttributeOrderFixer.cpp
 clang/lib/Format/QualifierAlignmentFixer.cpp
 clang/lib/Format/QualifierAlignmentFixer.h
 clang/lib/Format/SortJavaScriptImports.cpp
@@ -672,6 +674,7 @@
 clang/unittests/Format/FormatTestUtils.h
 clang/unittests/Format/MacroExpanderTest.cpp
 clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp
+clang/unittests/Format/ObjCPropertyAttributeOrderFixerTest.cpp
 clang/unittests/Format/QualifierFixerTest.cpp
 clang/unittests/Format/SortImportsTestJava.cpp
 clang/unittests/Format/SortImportsTestJS.cpp
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -555,6 +555,8 @@
 - Fix all known issues associated with ``LambdaBodyIndentation: OuterScope``.
 - Add ``BracedInitializerIndentWidth`` which can be used to configure
   the indentation level of the contents of braced init lists.
+- Add ``ObjCPropertyAttributeOrder`` which can be used to sort ObjC property
+  attributes (like ``nonatomic, strong, nullable``).
 
 libclang
 --------
Index: clang/docs/ClangFormatStyleOptions.rst
===================================================================
--- clang/docs/ClangFormatStyleOptions.rst
+++ clang/docs/ClangFormatStyleOptions.rst
@@ -3916,6 +3916,31 @@
              }]
      }
 
+.. _ObjCPropertyAttributeOrder:
+
+**ObjCPropertyAttributeOrder** (``List of Strings``) :versionbadge:`clang-format 17` :ref:`¶ <ObjCPropertyAttributeOrder>`
+  The order in which property attributes should appear, such as:
+
+    * class
+    * direct
+    * atomic, nonatomic
+    * assign, retain, strong, copy, weak, unsafe_unretained
+    * readonly, readwrite
+    * getter, setter
+    * nullable, nonnull, null_resettable, null_unspecified
+
+  Attributes in code will be sorted in the order specified. Any attributes
+  encountered that are not mentioned in this array will be sorted last, in
+  stable order. Duplicate attributes will be removed, but no other conflict
+  checking is performed. A leading or trailing comment is allowed to the
+  whole set, but comments encountered between attributes will leave the
+  entire set untouched.
+
+
+  .. code-block:: yaml
+
+    ObjCPropertyAttributeOrder: [nonatomic, strong, readwrite, nullable]
+
 .. _ObjCSpaceAfterProperty:
 
 **ObjCSpaceAfterProperty** (``Boolean``) :versionbadge:`clang-format 3.7` :ref:`¶ <ObjCSpaceAfterProperty>`
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