clang-format: Less eagerly try to keep label-value pairs on a line.

Before:
  string v =
      StrCat("aaaaaaaaaaaaaaaaaaaaaaaaaaa: ", SomeFunction(aaaaaaaaaaaa,
                                                           aaaaaaaaaaaaaaa),
             bbbbbbbbbbbbbbbbbbbbbbb);

After:
  string v = StrCat("aaaaaaaaaaaaaaaaaaaaaaaaaaa: ",
                    SomeFunction(aaaaaaaaaaaa, aaaaaaaaaaaaaaa),
                    bbbbbbbbbbbbbbbbbbbbbbb);

llvm-svn: 290337

2 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 7f573061594..cf6373f4565 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -2001,7 +2001,7 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
   if (Left.isOneOf(tok::plus, tok::comma) && Left.Previous &&
       Left.Previous->isLabelString() &&
       (Left.NextOperator || Left.OperatorIndex != 0))
-    return 100;
+    return 45;
   if (Right.is(tok::plus) && Left.isLabelString() &&
       (Right.NextOperator || Right.OperatorIndex != 0))
     return 25;
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 09b85357d15..6f9df680eef 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -5220,6 +5220,10 @@ TEST_F(FormatTest, KeepStringLabelValuePairsOnALine) {
   verifyFormat("string v = StrCat(\"aaaaaaaaaaaa: \" +\n"
                "                  (aaaaaaa + aaaaa));",
                getLLVMStyleWithColumns(40));
+  verifyFormat(
+      "string v = StrCat(\"aaaaaaaaaaaaaaaaaaaaaaaaaaa: \",\n"
+      "                  SomeFunction(aaaaaaaaaaaa, aaaaaaaa.aaaaaaa),\n"
+      "                  bbbbbbbbbbbbbbbbbbbbbbb);");
 }
 
 TEST_F(FormatTest, UnderstandsEquals) {