clang-tools-extra/clang-tidy/modernize/ConcatNestedNamespacesCheck.h

   1 //===--- ConcatNestedNamespacesCheck.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_MODERNIZE_CONCATNESTEDNAMESPACESCHECK_H
  10 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_CONCATNESTEDNAMESPACESCHECK_H
  11
  12 #include "../ClangTidyCheck.h"
  13 #include "llvm/ADT/SmallString.h"
  14 #include "llvm/ADT/SmallVector.h"
  15
  16 namespace clang::tidy::modernize {
  17
  18 using NamespaceName = llvm::SmallString<40>;
  19
  20 class NS : public llvm::SmallVector<const NamespaceDecl *, 6> {
  21 public:
  22   std::optional<SourceRange>
  23   getCleanedNamespaceFrontRange(const SourceManager &SM,
  24                                 const LangOptions &LangOpts) const;
  25   SourceRange getReplacedNamespaceFrontRange() const;
  26   SourceRange getNamespaceBackRange(const SourceManager &SM,
  27                                     const LangOptions &LangOpts) const;
  28   SourceRange getDefaultNamespaceBackRange() const;
  29   void appendName(NamespaceName &Str) const;
  30   void appendCloseComment(NamespaceName &Str) const;
  31 };
  32
  33 class ConcatNestedNamespacesCheck : public ClangTidyCheck {
  34 public:
  35   ConcatNestedNamespacesCheck(StringRef Name, ClangTidyContext *Context)
  36       : ClangTidyCheck(Name, Context) {}
  37   bool unsupportedNamespace(const NamespaceDecl &ND, bool IsChild) const;
  38   bool singleNamedNamespaceChild(const NamespaceDecl &ND) const;
  39   bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
  40     return LangOpts.CPlusPlus17;
  41   }
  42   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
  43   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
  44
  45 private:
  46   using NamespaceContextVec = llvm::SmallVector<NS, 6>;
  47
  48   void reportDiagnostic(const SourceManager &SM, const LangOptions &LangOpts);
  49   NamespaceContextVec Namespaces;
  50 };
  51 } // namespace clang::tidy::modernize
  52
  53 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_CONCATNESTEDNAMESPACESCHECK_H