[clang-format] Fix raw string prefix penalty

Summary: We weren't penalizing cases where the raw string prefix goes over the column limit.

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D44563

llvm-svn: 327708

1 files changed, 7 insertions, 1 deletions

diff --git a/clang/lib/Format/ContinuationIndenter.cpp b/clang/lib/Format/ContinuationIndenter.cpp
index 6027f5fd612..9d19262397a 100644
--- a/clang/lib/Format/ContinuationIndenter.cpp
+++ b/clang/lib/Format/ContinuationIndenter.cpp
@@ -1454,7 +1454,13 @@ unsigned ContinuationIndenter::reformatRawStringLiteral(
   unsigned RawLastLineEndColumn = getLastLineEndColumn(
       *NewCode, FirstStartColumn, Style.TabWidth, Encoding);
   State.Column = RawLastLineEndColumn + NewSuffixSize;
-  return Fixes.second;
+  // Since we're updating the column to after the raw string literal here, we
+  // have to manually add the penalty for the prefix R"delim( over the column
+  // limit.
+  unsigned PrefixExcessCharacters =
+      StartColumn + NewPrefixSize > Style.ColumnLimit ?
+      StartColumn + NewPrefixSize - Style.ColumnLimit : 0;
+  return Fixes.second + PrefixExcessCharacters * Style.PenaltyExcessCharacter;
 }
 
 unsigned ContinuationIndenter::addMultilineToken(const FormatToken &Current,