clang-format: Improve token breaking behavior.

Two changes:
* Don't add an extra penalty on breaking the same token multiple times.
  Generally, we should prefer not to break, but once we break, the
  normal line breaking penalties apply.
* Slightly increase the penalty for breaking comments. In general, the
  author has put some thought into how to break the comment and we
  should not overwrite this unnecessarily.

With a 40-column column limit, formatting
  aaaaaa("aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaa");

Leads to:
Before:
  aaaaaa(
      "aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaa "
      "aaaaaaaaaaaaaaaa");

After:
  aaaaaa("aaaaaaaaaaaaaaaa "
         "aaaaaaaaaaaaaaaa "
         "aaaaaaaaaaaaaaaa");

llvm-svn: 189466

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 1cd55d72973..3982ba6a771 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -152,7 +152,7 @@ namespace clang {
 namespace format {
 
 void setDefaultPenalties(FormatStyle &Style) {
-  Style.PenaltyBreakComment = 45;
+  Style.PenaltyBreakComment = 60;
   Style.PenaltyBreakFirstLessLess = 120;
   Style.PenaltyBreakString = 1000;
   Style.PenaltyExcessCharacter = 1000000;