[clang-format] Support sorting using declarations

Summary:
This patch adds UsingDeclarationsSorter, a TokenAnalyzer that sorts consecutive
using declarations.

Reviewers: klimek

Reviewed By: klimek

Subscribers: Typz, djasper, cfe-commits, klimek, mgorny

Differential Revision: https://reviews.llvm.org/D33823

llvm-svn: 305901

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 39da87c..aebe22c 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -23,6 +23,7 @@
 #include "TokenAnnotator.h"
 #include "UnwrappedLineFormatter.h"
 #include "UnwrappedLineParser.h"
+#include "UsingDeclarationsSorter.h"
 #include "WhitespaceManager.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticOptions.h"
@@ -1943,6 +1944,16 @@ tooling::Replacements fixNamespaceEndComments(const FormatStyle &Style,
   return Fix.process();
 }
 
+tooling::Replacements sortUsingDeclarations(const FormatStyle &Style,
+                                            StringRef Code,
+                                            ArrayRef<tooling::Range> Ranges,
+                                            StringRef FileName) {
+  std::unique_ptr<Environment> Env =
+      Environment::CreateVirtualEnvironment(Code, FileName, Ranges);
+  UsingDeclarationsSorter Sorter(*Env, Style);
+  return Sorter.process();
+}
+
 LangOptions getFormattingLangOpts(const FormatStyle &Style) {
   LangOptions LangOpts;
   LangOpts.CPlusPlus = 1;