clang-format: Fix bug in style option AlwaysBreakTemplateDeclarations.

Before:
  template <template <typename>
            class Fooooooo, template <typename>
            class Baaaaaaar>
  struct C {};

After:
  template <template <typename> class Fooooooo,
            template <typename> class Baaaaaaar>
  struct C {};

llvm-svn: 190747

2 files changed, 16 insertions, 9 deletions

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index db17135a0c7..f9b795ece90 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1052,7 +1052,10 @@ void TokenAnnotator::calculateFormattingInformation(AnnotatedLine &Line) {
                Current->Next->is(tok::string_literal)) {
       Current->MustBreakBefore = true;
     } else if (Current->Previous->ClosesTemplateDeclaration &&
+               Current->Previous->MatchingParen &&
+               Current->Previous->MatchingParen->BindingStrength == 1 &&
                Style.AlwaysBreakTemplateDeclarations) {
+      // FIXME: Fix horrible hack of using BindingStrength to find top-level <>.
       Current->MustBreakBefore = true;
     } else if (Current->Type == TT_CtorInitializerComma &&
                Style.BreakConstructorInitializersBeforeComma) {
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 6d504c0c786..020f4480330 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -3519,15 +3519,6 @@ TEST_F(FormatTest, WrapsTemplateDeclarations) {
   verifyFormat("template <typename T> class C {};");
   verifyFormat("template <typename T> void f();");
   verifyFormat("template <typename T> void f() {}");
-
-  FormatStyle AlwaysBreak = getLLVMStyle();
-  AlwaysBreak.AlwaysBreakTemplateDeclarations = true;
-  verifyFormat("template <typename T>\nclass C {};", AlwaysBreak);
-  verifyFormat("template <typename T>\nvoid f();", AlwaysBreak);
-  verifyFormat("template <typename T>\nvoid f() {}", AlwaysBreak);
-  verifyFormat("void aaaaaaaaaaaaaaaaaaa<aaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
-               "                         bbbbbbbbbbbbbbbbbbbbbbbbbbbb>(\n"
-               "    ccccccccccccccccccccccccccccccccccccccccccccccc);");
   verifyFormat(
       "aaaaaaaaaaaaa<aaaaaaaaaa, aaaaaaaaaaa,\n"
       "              aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
@@ -3537,6 +3528,19 @@ TEST_F(FormatTest, WrapsTemplateDeclarations) {
       "                      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa>(\n"
       "        bbbbbbbbbbbbbbbbbbbbbbbb);",
       getLLVMStyleWithColumns(72));
+
+  FormatStyle AlwaysBreak = getLLVMStyle();
+  AlwaysBreak.AlwaysBreakTemplateDeclarations = true;
+  verifyFormat("template <typename T>\nclass C {};", AlwaysBreak);
+  verifyFormat("template <typename T>\nvoid f();", AlwaysBreak);
+  verifyFormat("template <typename T>\nvoid f() {}", AlwaysBreak);
+  verifyFormat("void aaaaaaaaaaaaaaaaaaa<aaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+               "                         bbbbbbbbbbbbbbbbbbbbbbbbbbbb>(\n"
+               "    ccccccccccccccccccccccccccccccccccccccccccccccc);");
+  verifyFormat("template <template <typename> class Fooooooo,\n"
+               "          template <typename> class Baaaaaaar>\n"
+               "struct C {};",
+               AlwaysBreak);
 }
 
 TEST_F(FormatTest, WrapsAtNestedNameSpecifiers) {