Become a little smarter with formatting long chains of pipes.

Assign a high penalty to breaking before "<<" if the previous token is a
string literal ending in ":" or "=".

Before:
llvm::outs()
    << "aaaaaaaaaaaaaaaaa = " << aaaaaaaaaaaaaaaaa << "bbbbbbbbbbbbbbbbb = "
    << bbbbbbbbbbbbbbbbb << "ccccccccccccccccc = " << ccccccccccccccccc
    << "ddddddddddddddddd = " << ddddddddddddddddd << "eeeeeeeeeeeeeeeee = "
    << eeeeeeeeeeeeeeeee;

After:
llvm::outs() << "aaaaaaaaaaaaaaaaa = " << aaaaaaaaaaaaaaaaa
             << "bbbbbbbbbbbbbbbbb = " << bbbbbbbbbbbbbbbbb
             << "ccccccccccccccccc = " << ccccccccccccccccc
             << "ddddddddddddddddd = " << ddddddddddddddddd
             << "eeeeeeeeeeeeeeeee = " << eeeeeeeeeeeeeeeee;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174545 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/Format/TokenAnnotator.cpp b/lib/Format/TokenAnnotator.cpp
index 9c7834f564..ad3baae00d 100644
--- a/lib/Format/TokenAnnotator.cpp
+++ b/lib/Format/TokenAnnotator.cpp
@@ -784,8 +784,16 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
       Left.Type == TT_TemplateOpener)
     return 20;
 
-  if (Right.is(tok::lessless))
+  if (Right.is(tok::lessless)) {
+    if (Left.is(tok::string_literal)) {
+      char LastChar =
+          StringRef(Left.FormatTok.Tok.getLiteralData(),
+                    Left.FormatTok.TokenLength).drop_back(1).rtrim().back();
+      if (LastChar == ':' || LastChar == '=')
+        return 100;
+    }
     return prec::Shift;
+  }
   if (Left.Type == TT_ConditionalExpr)
     return prec::Assignment;
   prec::Level Level = getPrecedence(Left);