Get less confused by trailing comma in Google style.

The formatter can now format:
void aaaaaaaaaaaaaaaaaa(int level,
                        double *min_x,
                        double *max_x,
                        double *min_y,
                        double *max_y,
                        double *min_z,
                        double *max_z, ) {
}

Although this is invalid code, it frequently happens during development and
clang-format should be nicer :-).

llvm-svn: 175151

2 files changed, 13 insertions, 1 deletions

diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 1bd864e5c9d..f03b77853ce 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -781,7 +781,8 @@ private:
       return true;
     if (State.NextToken->Parent->is(tok::comma) &&
         State.Stack.back().BreakBeforeParameter &&
-        !isTrailingComment(*State.NextToken))
+        !isTrailingComment(*State.NextToken) &&
+        State.NextToken->isNot(tok::r_paren))
       return true;
     // FIXME: Comparing LongestObjCSelectorName to 0 is a hacky way of finding
     // out whether it is the first parameter. Clean this up.
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index d5e3c24545a..e99aad7a8cf 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -1817,6 +1817,17 @@ TEST_F(FormatTest, HandlesIncludeDirectives) {
 // Error recovery tests.
 //===----------------------------------------------------------------------===//
 
+TEST_F(FormatTest, IncompleteParameterLists) {
+  verifyGoogleFormat("void aaaaaaaaaaaaaaaaaa(int level,\n"
+                     "                        double *min_x,\n"
+                     "                        double *max_x,\n"
+                     "                        double *min_y,\n"
+                     "                        double *max_y,\n"
+                     "                        double *min_z,\n"
+                     "                        double *max_z, ) {\n"
+                     "}");
+}
+
 TEST_F(FormatTest, IncorrectCodeTrailingStuff) {
   verifyFormat("void f() { return; }\n42");
   verifyFormat("void f() {\n"