clang-format: Support case ranges.

Before (note the missing space before "..." which can lead to compile
errors):
  switch (x) {
    case 'A'... 'Z':
    case 1... 5:
        break;
  }

After:
  switch (x) {
    case 'A' ... 'Z':
    case 1 ... 5:
        break;
  }

llvm-svn: 193050

2 files changed, 9 insertions, 1 deletions

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 9bc109787ae..7e794a3d2d5 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1237,7 +1237,7 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
   if (Left.is(tok::less) || Right.isOneOf(tok::greater, tok::less))
     return false;
   if (Right.is(tok::ellipsis))
-    return false;
+    return Left.Tok.isLiteral();
   if (Left.is(tok::l_square) && Right.is(tok::amp))
     return false;
   if (Right.Type == TT_PointerOrReference)
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index dcb708e0d78..ad1cf75392b 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -590,6 +590,14 @@ TEST_F(FormatTest, FormatsSwitchStatement) {
                "});");
 }
 
+TEST_F(FormatTest, CaseRanges) {
+  verifyFormat("switch (x) {\n"
+               "case 'A' ... 'Z':\n"
+               "case 1 ... 5:\n"
+               "  break;\n"
+               "}");
+}
+
 TEST_F(FormatTest, FormatsLabels) {
   verifyFormat("void f() {\n"
                "  some_code();\n"