Simplify logic for avoiding concatenation after numeric constants.

I threw in a couple of test cases for UD-suffixes -- already working, but
it wasn't immediately obvious to me.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174767 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 47 insertions, 0 deletions

diff --git a/test/Preprocessor/output_paste_avoid.cpp b/test/Preprocessor/output_paste_avoid.cpp
new file mode 100644
index 0000000000..689d966e86
--- /dev/null
+++ b/test/Preprocessor/output_paste_avoid.cpp
@@ -0,0 +1,47 @@
+// RUN: %clang_cc1 -E -std=c++11 %s -o - | FileCheck -strict-whitespace %s
+
+
+#define y(a) ..a
+A: y(.)
+// This should print as ".. ." to avoid turning into ...
+// CHECK: A: .. .
+
+#define X 0 .. 1
+B: X
+// CHECK: B: 0 .. 1
+
+#define DOT .
+C: ..DOT
+// CHECK: C: .. .
+
+
+#define PLUS +
+#define EMPTY
+#define f(x) =x=
+D: +PLUS -EMPTY- PLUS+ f(=)
+// CHECK: D: + + - - + + = = =
+
+
+#define test(x) L#x
+E: test(str)
+// Should expand to L "str" not L"str"
+// CHECK: E: L "str"
+
+// Should avoid producing >>=.
+#define equal =
+F: >>equal
+// CHECK: F: >> =
+
+// Make sure we don't introduce spaces in the guid because we try to avoid
+// pasting '-' to a numeric constant.
+#define TYPEDEF(guid)   typedef [uuid(guid)]
+TYPEDEF(66504301-BE0F-101A-8BBB-00AA00300CAB) long OLE_COLOR;
+// CHECK: typedef [uuid(66504301-BE0F-101A-8BBB-00AA00300CAB)] long OLE_COLOR;
+
+// Be careful with UD-suffixes.
+#define StrSuffix() "abc"_suffix
+#define IntSuffix() 123_suffix
+UD: StrSuffix()ident
+UD: IntSuffix()ident
+// CHECK: UD: "abc"_suffix ident
+// CHECK: UD: 123_suffix ident