1 //===--- UsingNamespaceDirectiveCheck.h - clang-tidy ------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_GOOGLE_USINGNAMESPACEDIRECTIVECHECK_H
10 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_GOOGLE_USINGNAMESPACEDIRECTIVECHECK_H
11 
12 #include "../ClangTidyCheck.h"
13 
14 namespace clang::tidy::google::build {
15 
16 /// Finds using namespace directives.
17 ///
18 /// https://google.github.io/styleguide/cppguide.html#Namespaces
19 ///
20 /// The check implements the following rule of the Google C++ Style Guide:
21 ///
22 ///   You may not use a using-directive to make all names from a namespace
23 ///   available.
24 ///
25 ///   \code
26 ///     // Forbidden -- This pollutes the namespace.
27 ///     using namespace foo;
28 ///   \endcode
29 ///
30 /// Corresponding cpplint.py check name: `build/namespaces`.
31 ///
32 /// For the user-facing documentation see:
33 /// https://clang.llvm.org/extra/clang-tidy/checks/google/build-using-namespace.html
34 class UsingNamespaceDirectiveCheck : public ClangTidyCheck {
35 public:
UsingNamespaceDirectiveCheck(StringRef Name,ClangTidyContext * Context)36   UsingNamespaceDirectiveCheck(StringRef Name, ClangTidyContext *Context)
37       : ClangTidyCheck(Name, Context) {}
isLanguageVersionSupported(const LangOptions & LangOpts)38   bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
39     return LangOpts.CPlusPlus;
40   }
41   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
42   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
43 
44 private:
45   static bool isStdLiteralsNamespace(const NamespaceDecl *NS);
46 };
47 
48 } // namespace clang::tidy::google::build
49 
50 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_GOOGLE_USINGNAMESPACEDIRECTIVECHECK_H
51