clang-tools-extra/clang-tidy/google/UnnamedNamespaceInHeaderCheck.cpp

   1 //===--- UnnamedNamespaceInHeaderCheck.cpp - 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 #include "UnnamedNamespaceInHeaderCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12 #include "clang/ASTMatchers/ASTMatchers.h"
  13
  14 using namespace clang::ast_matchers;
  15
  16 namespace clang::tidy::google::build {
  17
  18 UnnamedNamespaceInHeaderCheck::UnnamedNamespaceInHeaderCheck(
  19     StringRef Name, ClangTidyContext *Context)
  20     : ClangTidyCheck(Name, Context) {
  21   std::optional<StringRef> HeaderFileExtensionsOption =
  22       Options.get("HeaderFileExtensions");
  23   RawStringHeaderFileExtensions =
  24       HeaderFileExtensionsOption.value_or(utils::defaultHeaderFileExtensions());
  25   if (HeaderFileExtensionsOption) {
  26     if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
  27                                     HeaderFileExtensions,
  28                                     utils::defaultFileExtensionDelimiters())) {
  29       this->configurationDiag("Invalid header file extension: '%0'")
  30           << RawStringHeaderFileExtensions;
  31     }
  32   } else
  33     HeaderFileExtensions = Context->getHeaderFileExtensions();
  34 }
  35
  36 void UnnamedNamespaceInHeaderCheck::storeOptions(
  37     ClangTidyOptions::OptionMap &Opts) {
  38   Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
  39 }
  40
  41 void UnnamedNamespaceInHeaderCheck::registerMatchers(
  42     ast_matchers::MatchFinder *Finder) {
  43     Finder->addMatcher(namespaceDecl(isAnonymous()).bind("anonymousNamespace"),
  44                        this);
  45 }
  46
  47 void UnnamedNamespaceInHeaderCheck::check(
  48     const MatchFinder::MatchResult &Result) {
  49   const auto *N = Result.Nodes.getNodeAs<NamespaceDecl>("anonymousNamespace");
  50   SourceLocation Loc = N->getBeginLoc();
  51   if (!Loc.isValid())
  52     return;
  53
  54   if (utils::isPresumedLocInHeaderFile(Loc, *Result.SourceManager,
  55                                        HeaderFileExtensions))
  56     diag(Loc, "do not use unnamed namespaces in header files");
  57 }
  58
  59 } // namespace clang::tidy::google::build