Put a higher penalty on breaking before "." or "->".

This fixes llvm.org/PR14823.

Before:
    local_state->SetString(prefs::kApplicationLocale, parent_local_state
                                ->GetString(prefs::kApplicationLocale));
After:
    local_state->SetString(
        prefs::kApplicationLocale,
        parent_local_state->GetString(prefs::kApplicationLocale));

llvm-svn: 171705

2 files changed, 7 insertions, 2 deletions

diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 4d401a5be9e..c6ff8801861 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -99,7 +99,7 @@ public:
         Annotations(Annotations), Replaces(Replaces),
         StructuralError(StructuralError) {
     Parameters.PenaltyIndentLevel = 15;
-    Parameters.PenaltyLevelDecrease = 10;
+    Parameters.PenaltyLevelDecrease = 30;
   }
 
   /// \brief Formats an \c UnwrappedLine.
@@ -369,7 +369,7 @@ private:
       return Level;
 
     if (Right.Tok.is(tok::arrow) || Right.Tok.is(tok::period))
-      return 50;
+      return 150;
 
     return 3;
   }
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 28f63aa0551..de794dabb6c 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -713,9 +713,14 @@ TEST_F(FormatTest, WrapsAtFunctionCallsIfNecessary) {
       "function(LoooooooooooooooooooooooooooooooooooongObject\n"
       "             ->loooooooooooooooooooooooooooooooooooooooongFunction());");
 
+  // Here, it is not necessary to wrap at "." or "->".
   verifyFormat("if (aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaa) ||\n"
                "    aaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) {\n"
                "}");
+  verifyFormat(
+      "aaaaaaaaaaa->aaaaaaaaa(\n"
+      "    aaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+      "    aaaaaaaaaaaaaaaaaa->aaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaaaa));\n");
 }
 
 TEST_F(FormatTest, WrapsTemplateDeclarations) {