clang-format: Don't wrap after @interface.

This fixes llvm.org/PR19450.

Before:
  @interface
  BookmarkHomeHandsetViewController ()<BookmarkAllCollectionViewDelegate,
                                       BookmarkFolderCollectionViewDelegate,
                                       BookmarkMenuViewControllerDelegate,
                                       BookmarkSearchViewControllerDelegate> {
  }

After:
  @interface aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ()<
      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa> {
  }

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@207400 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 12 insertions, 0 deletions

diff --git a/lib/Format/TokenAnnotator.cpp b/lib/Format/TokenAnnotator.cpp
index 52764552b0..d2b79e544e 100644
--- a/lib/Format/TokenAnnotator.cpp
+++ b/lib/Format/TokenAnnotator.cpp
@@ -1583,6 +1583,8 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
   const FormatToken &Left = *Right.Previous;
   if (Left.is(tok::at))
     return false;
+  if (Left.Tok.getObjCKeywordID() == tok::objc_interface)
+    return false;
   if (Right.Type == TT_StartOfName || Right.is(tok::kw_operator))
     return true;
   if (Right.isTrailingComment())
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index d18968afd5..7d5ad9ba14 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -5848,6 +5848,16 @@ TEST_F(FormatTest, FormatObjCInterface) {
                "}\n"
                "+ (id)init;\n"
                "@end");
+
+  FormatStyle OnePerLine = getGoogleStyle();
+  OnePerLine.BinPackParameters = false;
+  verifyFormat("@interface aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ()<\n"
+               "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+               "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+               "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+               "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa> {\n"
+               "}",
+               OnePerLine);
 }
 
 TEST_F(FormatTest, FormatObjCImplementation) {