| 1 | //===--- UsingNamespaceDirectiveCheck.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 "UsingNamespaceDirectiveCheck.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 | void UsingNamespaceDirectiveCheck::registerMatchers( |
| 19 | ast_matchers::MatchFinder *Finder) { |
| 20 | Finder->addMatcher(NodeMatch: usingDirectiveDecl().bind(ID: "usingNamespace"), Action: this); |
| 21 | } |
| 22 | |
| 23 | void UsingNamespaceDirectiveCheck::check( |
| 24 | const MatchFinder::MatchResult &Result) { |
| 25 | const auto *U = Result.Nodes.getNodeAs<UsingDirectiveDecl>(ID: "usingNamespace"); |
| 26 | SourceLocation Loc = U->getBeginLoc(); |
| 27 | if (U->isImplicit() || !Loc.isValid()) |
| 28 | return; |
| 29 | |
| 30 | // Do not warn if namespace is a std namespace with user-defined literals. The |
| 31 | // user-defined literals can only be used with a using directive. |
| 32 | if (isStdLiteralsNamespace(NS: U->getNominatedNamespace())) |
| 33 | return; |
| 34 | |
| 35 | diag(Loc, Description: "do not use namespace using-directives; " |
| 36 | "use using-declarations instead"); |
| 37 | // TODO: We could suggest a list of using directives replacing the using |
| 38 | // namespace directive. |
| 39 | } |
| 40 | |
| 41 | bool UsingNamespaceDirectiveCheck::isStdLiteralsNamespace( |
| 42 | const NamespaceDecl *NS) { |
| 43 | if (!NS->getName().ends_with("literals")) |
| 44 | return false; |
| 45 | |
| 46 | const auto *Parent = dyn_cast_or_null<NamespaceDecl>(NS->getParent()); |
| 47 | if (!Parent) |
| 48 | return false; |
| 49 | |
| 50 | if (Parent->isStdNamespace()) |
| 51 | return true; |
| 52 | |
| 53 | return Parent->getName() == "literals"&& Parent->getParent() && |
| 54 | Parent->getParent()->isStdNamespace(); |
| 55 | } |
| 56 | } // namespace clang::tidy::google::build |
| 57 |