[clang-format] Support text proto extensions

Summary:
This adds support for text proto extensions, like:
```
msg {
  [type.type/ext] {
    key: value
  }
}
```

Reviewers: djasper

Reviewed By: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D43180

llvm-svn: 324995

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTestProto.cpp b/clang/unittests/Format/FormatTestProto.cpp
index d667ec2b3e9..27ecde7f340 100644
--- a/clang/unittests/Format/FormatTestProto.cpp
+++ b/clang/unittests/Format/FormatTestProto.cpp
@@ -421,5 +421,16 @@ TEST_F(FormatTestProto, KeepsLongStringLiteralsOnSameLine) {
       "}");
 }
 
+TEST_F(FormatTestProto, FormatsOptionsExtensions) {
+  verifyFormat("option (MyProto.options) = {\n"
+               "  msg_field: { field_d: 123 }\n"
+               "  [ext.t/u] { key: value }\n"
+               "  key: value\n"
+               "  [t.u/v] <\n"
+               "    [ext] { key: value }\n"
+               "  >\n"
+               "};");
+}
+
 } // end namespace tooling
 } // end namespace clang