| //===--- UsingNamespaceDirectiveCheck.cpp - clang-tidy ----------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "UsingNamespaceDirectiveCheck.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/ASTMatchers/ASTMatchFinder.h" |
| #include "clang/ASTMatchers/ASTMatchers.h" |
| |
| using namespace clang::ast_matchers; |
| |
| namespace clang { |
| namespace tidy { |
| namespace google { |
| namespace build { |
| |
| void UsingNamespaceDirectiveCheck::registerMatchers( |
| ast_matchers::MatchFinder *Finder) { |
| Finder->addMatcher(usingDirectiveDecl().bind("usingNamespace"), this); |
| } |
| |
| void UsingNamespaceDirectiveCheck::check( |
| const MatchFinder::MatchResult &Result) { |
| const auto *U = Result.Nodes.getNodeAs<UsingDirectiveDecl>("usingNamespace"); |
| SourceLocation Loc = U->getBeginLoc(); |
| if (U->isImplicit() || !Loc.isValid()) |
| return; |
| |
| // Do not warn if namespace is a std namespace with user-defined literals. The |
| // user-defined literals can only be used with a using directive. |
| if (isStdLiteralsNamespace(U->getNominatedNamespace())) |
| return; |
| |
| diag(Loc, "do not use namespace using-directives; " |
| "use using-declarations instead"); |
| // TODO: We could suggest a list of using directives replacing the using |
| // namespace directive. |
| } |
| |
| bool UsingNamespaceDirectiveCheck::isStdLiteralsNamespace( |
| const NamespaceDecl *NS) { |
| if (!NS->getName().endswith("literals")) |
| return false; |
| |
| const auto *Parent = dyn_cast_or_null<NamespaceDecl>(NS->getParent()); |
| if (!Parent) |
| return false; |
| |
| if (Parent->isStdNamespace()) |
| return true; |
| |
| return Parent->getName() == "literals" && Parent->getParent() && |
| Parent->getParent()->isStdNamespace(); |
| } |
| } // namespace build |
| } // namespace google |
| } // namespace tidy |
| } // namespace clang |