[PATCH] D146434: [clang-format] Fix support for ObjC blocks with pointer return types

[Jared Grubb via Phabricator via cfe-commits]

jaredgrubb created this revision.
jaredgrubb added reviewers: djasper, egorzhdan, benhamilton.
jaredgrubb added a project: clang-format.
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The ObjC-block detection code only supports a single token as the return type. Add support to detect pointers, too (ObjC has lots of object-pointers).

For example, using `BasedOnStyle: WebKit`, the following is stable output:

  int* p = ^int*(void)
  { //
      return nullptr;
  }
  ();

After the patch:

  int* p = ^int*(void) { //
      return nullptr;
  }();


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146434

Files:
  clang/lib/Format/UnwrappedLineParser.cpp
  clang/unittests/Format/FormatTest.cpp
  clang/unittests/Format/FormatTestObjC.cpp


Index: clang/unittests/Format/FormatTestObjC.cpp
===================================================================
--- clang/unittests/Format/FormatTestObjC.cpp
+++ clang/unittests/Format/FormatTestObjC.cpp
@@ -994,6 +994,20 @@
   verifyFormat("int (^foo[kNumEntries])(char, float);");
   verifyFormat("int (^foo[kNumEntries + 10])(char, float);");
   verifyFormat("int (^foo[(kNumEntries + 10)])(char, float);");
+
+  verifyFormat("int *p = ^int *() { //\n"
+               "  return nullptr;\n"
+               "}();");
+
+  verifyFormat("int * (^p)(void) = ^int *(void) { //\n"
+               "  return nullptr;\n"
+               "};");
+
+  // WebKit forces function braces onto a newline, but blocks should not.
+  Style = getWebKitStyle();
+  verifyFormat("int* p = ^int*() { //\n"
+               "    return nullptr;\n"
+               "}();");
 }
 
 TEST_F(FormatTestObjC, ObjCSnippets) {
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -22175,7 +22175,8 @@
                "    }\n"
                "  }\n"
                "});");
-  verifyFormat("Block b = ^int *(A *a, B *b) {}");
+  verifyFormat("Block b = ^int *(A *a, B *b) {\n"
+               "};");
   verifyFormat("BOOL (^aaa)(void) = ^BOOL {\n"
                "};");
 
Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -1773,12 +1773,18 @@
       break;
     case tok::caret:
       nextToken();
+      // Block return type.
       if (FormatTok->Tok.isAnyIdentifier() ||
           FormatTok->isSimpleTypeSpecifier()) {
         nextToken();
+        // Return types: pointers are ok too.
+        while (FormatTok->is(tok::star))
+          nextToken();
       }
+      // Block argument list.
       if (FormatTok->is(tok::l_paren))
         parseParens();
+      // Block body.
       if (FormatTok->is(tok::l_brace))
         parseChildBlock();
       break;


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