void DeprecatedIosBaseAliasesCheck::check(
    const MatchFinder::MatchResult &Result) {
  SourceManager &SM = *Result.SourceManager;

  const auto *Typedef = Result.Nodes.getNodeAs<TypedefDecl>("TypeDecl");
  StringRef TypeName = Typedef->getName();
  bool HasReplacement = ReplacementTypes.count(TypeName);

  const auto *TL = Result.Nodes.getNodeAs<TypeLoc>("TypeLoc");
  SourceLocation IoStateLoc = TL->getBeginLoc();

  // Do not generate fixits for matches depending on template arguments and
  // macro expansions.
  bool Fix = HasReplacement && !TL->getType()->isDependentType();
  if (IoStateLoc.isMacroID()) {
    IoStateLoc = SM.getSpellingLoc(IoStateLoc);
    Fix = false;
  }

  SourceLocation EndLoc = IoStateLoc.getLocWithOffset(TypeName.size() - 1);

  if (HasReplacement) {
    auto FixName = ReplacementTypes.lookup(TypeName);
    auto Builder = diag(IoStateLoc, "'std::ios_base::%0' is deprecated; use "
                                    "'std::ios_base::%1' instead")
                   << TypeName << FixName;

    if (Fix)
      Builder << FixItHint::CreateReplacement(SourceRange(IoStateLoc, EndLoc),
                                              FixName);
  } else
    diag(IoStateLoc, "'std::ios_base::%0' is deprecated") << TypeName;
}
static FoundationClass findKnownClass(const ObjCInterfaceDecl *ID) {
  static llvm::StringMap<FoundationClass> Classes;
  if (Classes.empty()) {
    Classes["NSArray"] = FC_NSArray;
    Classes["NSDictionary"] = FC_NSDictionary;
    Classes["NSEnumerator"] = FC_NSEnumerator;
    Classes["NSOrderedSet"] = FC_NSOrderedSet;
    Classes["NSSet"] = FC_NSSet;
    Classes["NSString"] = FC_NSString;
  }

  // FIXME: Should we cache this at all?
  FoundationClass result = Classes.lookup(ID->getIdentifier()->getName());
  if (result == FC_None)
    if (const ObjCInterfaceDecl *Super = ID->getSuperClass())
      return findKnownClass(Super);

  return result;
}