[clang-format] Add a NamespaceEndCommentsFixer

Summary:
This patch adds a NamespaceEndCommentsFixer TokenAnalyzer for clang-format,
which fixes end namespace comments.
It currently supports inserting and updating existing wrong comments.

Example source:
```
namespace A {
int i;
}

namespace B {
int j;
} // namespace A
```

after formatting:
```
namespace A {
int i;
} // namespace A

namespace B {
int j;
} // namespace B
```

Reviewers: klimek, djasper

Reviewed By: djasper

Subscribers: klimek, mgorny

Differential Revision: https://reviews.llvm.org/D30269

llvm-svn: 296341

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index a48bd37d4d9..99787408133 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -17,6 +17,7 @@
 #include "AffectedRangeManager.h"
 #include "ContinuationIndenter.h"
 #include "FormatTokenLexer.h"
+#include "NamespaceEndCommentsFixer.h"
 #include "SortJavaScriptImports.h"
 #include "TokenAnalyzer.h"
 #include "TokenAnnotator.h"
@@ -1857,6 +1858,16 @@ tooling::Replacements cleanup(const FormatStyle &Style, StringRef Code,
   return Clean.process();
 }
 
+tooling::Replacements fixNamespaceEndComments(const FormatStyle &Style,
+                                              StringRef Code,
+                                              ArrayRef<tooling::Range> Ranges,
+                                              StringRef FileName) {
+  std::unique_ptr<Environment> Env =
+      Environment::CreateVirtualEnvironment(Code, FileName, Ranges);
+  NamespaceEndCommentsFixer Fix(*Env, Style);
+  return Fix.process();
+}
+
 LangOptions getFormattingLangOpts(const FormatStyle &Style) {
   LangOptions LangOpts;
   LangOpts.CPlusPlus = 1;