Allow breaking after "::" if absolutely necessary.

Otherwise, really long nested name specifiers can easily lead to a
violation of the column limit.

Not sure about the rules for indentation in those cases, so input is
appreciated (see tests.).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173438 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 27 insertions, 0 deletions

diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index d8a6ddcb68..2250c03b58 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -1204,6 +1204,33 @@ TEST_F(FormatTest, WrapsTemplateDeclarations) {
       "void f();");
 }
 
+TEST_F(FormatTest, WrapsAtNestedNameSpecifiers) {
+  verifyFormat(
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa::\n"
+      "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa();");
+  verifyFormat(
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa::\n"
+      "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
+      "        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa());");
+
+  // FIXME: Should we have an extra indent after the second break?
+  verifyFormat(
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa::\n"
+      "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa::\n"
+      "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa();");
+
+  // FIXME: Look into whether we should indent 4 from the start or 4 from
+  // "bbbbb..." here instead of what we are doing now.
+  verifyFormat(
+      "aaaaaaaaaaaaaaa(bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb::\n"
+      "                cccccccccccccccccccccccccccccccccccccccccccccccccc());");
+
+  // Breaking at nested name specifiers is generally not desirable.
+  verifyFormat(
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa::aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
+      "    aaaaaaaaaaaaaaaaaaaaaaa);");
+}
+
 TEST_F(FormatTest, UnderstandsTemplateParameters) {
   verifyFormat("A<int> a;");
   verifyFormat("A<A<A<int> > > a;");