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:
ConcatNestedNamespacesCheck(StringRef Name,ClangTidyContext * Context)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;
isLanguageVersionSupported(const LangOptions & LangOpts)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
54