clang-format: [JS] Understand line breaks in concatenated strings.

Before:
  var literal = 'hello ' + 'world';

After:
  var literal = 'hello ' +
                'world';

There is no reason to concatenated two string literals with a '+' unless
the line break is intended.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209413 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/unittests/Format/FormatTestJS.cpp b/unittests/Format/FormatTestJS.cpp
index 33bfe06e5f..ecf4e69999 100644
--- a/unittests/Format/FormatTestJS.cpp
+++ b/unittests/Format/FormatTestJS.cpp
@@ -164,6 +164,11 @@ TEST_F(FormatTestJS, TryCatch) {
                "}");
 }
 
+TEST_F(FormatTestJS, StringLiteralConcatenation) {
+  verifyFormat("var literal = 'hello ' +\n"
+               "              'world';");
+}
+
 TEST_F(FormatTestJS, RegexLiteralClassification) {
   // Regex literals.
   verifyFormat("var regex = /abc/;");