1 files changed, 41 insertions, 0 deletions
diff --git a/clang-tools-extra/clang-tidy/modernize/ConcatNestedNamespacesCheck.h b/clang-tools-extra/clang-tidy/modernize/ConcatNestedNamespacesCheck.h
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index 00000000000..547690d2e87
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+++ b/clang-tools-extra/clang-tidy/modernize/ConcatNestedNamespacesCheck.h
@@ -0,0 +1,41 @@
+//===--- ConcatNestedNamespacesCheck.h - clang-tidy--------------*- C++ -*-===//
+//
+//                     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_MODERNIZE_CONCATNESTEDNAMESPACESCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_CONCATNESTEDNAMESPACESCHECK_H
+
+#include "../ClangTidy.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+
+namespace clang {
+namespace tidy {
+namespace modernize {
+
+class ConcatNestedNamespacesCheck : public ClangTidyCheck {
+public:
+  ConcatNestedNamespacesCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+private:
+  using NamespaceContextVec = llvm::SmallVector<const NamespaceDecl *, 6>;
+  using NamespaceString = llvm::SmallString<40>;
+
+  void reportDiagnostic(const SourceRange &FrontReplacement,
+                        const SourceRange &BackReplacement);
+  NamespaceString concatNamespaces();
+  NamespaceContextVec Namespaces;
+};
+} // namespace modernize
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_CONCATNESTEDNAMESPACESCHECK_H