clang-format: Handle \n the same way as std::endl with stream operator.

clang-format breaks multi-line streams after std::endl.
It now also break for '\n', the suggested replacement for std::endl:

  http://llvm.org/docs/CodingStandards.html#avoid-std-endl

Before:
  llvm::errs() << aaaaaaaaaaaaaaaaaaaaaa << '\n' << bbbbbbbbbbbbbbbbbbbbbb
               << '\n';
  llvm::errs() << aaaa << "aaaaaaaaaaaaaaaaaa\n" << bbbb
               << "bbbbbbbbbbbbbbbbbb\n";

After:
  llvm::errs() << aaaaaaaaaaaaaaaaaaaaaa << '\n'
               << bbbbbbbbbbbbbbbbbbbbbb << '\n';
  llvm::errs() << aaaa << "aaaaaaaaaaaaaaaaaa\n"
               << bbbb << "bbbbbbbbbbbbbbbbbb\n";

This changeset ensure that multiline streams have a line break after:
  - std::endl
  - '\n'
  - "\n"
  - "Some Text\n"

Patch by Jean-Philippe Dufraigne, thank you.

llvm-svn: 256832

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 11acb9ec1b9..8156dc7a3aa 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -5065,6 +5065,15 @@ TEST_F(FormatTest, AlignsPipes) {
   verifyFormat("llvm::errs() << aaaaaaaaaaaaaaaaaaaaaa << endl\n"
                "             << bbbbbbbbbbbbbbbbbbbbbb << endl;");
   verifyFormat("llvm::errs() << endl << bbbbbbbbbbbbbbbbbbbbbb << endl;");
+
+  // Handle '\n'.
+  verifyFormat("llvm::errs() << aaaaaaaaaaaaaaaaaaaaaa << \"\\n\"\n"
+               "             << bbbbbbbbbbbbbbbbbbbbbb << \"\\n\";");
+  verifyFormat("llvm::errs() << aaaaaaaaaaaaaaaaaaaaaa << \'\\n\'\n"
+               "             << bbbbbbbbbbbbbbbbbbbbbb << \'\\n\';");
+  verifyFormat("llvm::errs() << aaaa << \"aaaaaaaaaaaaaaaaaa\\n\"\n"
+               "             << bbbb << \"bbbbbbbbbbbbbbbbbb\\n\";");
+  verifyFormat("llvm::errs() << \"\\n\" << bbbbbbbbbbbbbbbbbbbbbb << \"\\n\";");
 }
 
 TEST_F(FormatTest, UnderstandsEquals) {