Recommit "[ClangTidy] Add UsingInserter and NamespaceAliaser"

Summary: This adds helper classes to add using declaractions and namespace aliases to function bodies. These help making function calls to deeply nested functions concise (e.g. when calling helpers in a refactoring)

Patch by Julian Bangert!

Reviewers: alexfh, hokein

Subscribers: beanz, mgorny, cfe-commits

Differential Revision: https://reviews.llvm.org/D24997

llvm-svn: 284368

1 files changed, 25 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-tidy/utils/ASTUtils.h b/clang-tools-extra/clang-tidy/utils/ASTUtils.h
new file mode 100644
index 00000000000..898ba9e6429
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/utils/ASTUtils.h
@@ -0,0 +1,25 @@
+//===---------- ASTUtils.h - clang-tidy -----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ASTUTILS_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ASTUTILS_H
+
+#include "clang/AST/AST.h"
+
+namespace clang {
+namespace tidy {
+namespace utils {
+// Returns the (closest) Function declaration surrounding |Statement| or NULL.
+const FunctionDecl *getSurroundingFunction(ASTContext &Context,
+                                           const Stmt &Statement);
+} // namespace utils
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ASTUTILS_H