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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
//===--- UsingNamespaceDirectiveCheck.cpp - clang-tidy ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "UsingNamespaceDirectiveCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/ASTMatchers/ASTMatchers.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace google {
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namespace build {
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void UsingNamespaceDirectiveCheck::registerMatchers(
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ast_matchers::MatchFinder *Finder) {
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// Only register the matchers for C++; the functionality currently does not
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// provide any benefit to other languages, despite being benign.
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if (getLangOpts().CPlusPlus)
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Finder->addMatcher(usingDirectiveDecl().bind("usingNamespace"), this);
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}
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void UsingNamespaceDirectiveCheck::check(
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const MatchFinder::MatchResult &Result) {
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const auto *U = Result.Nodes.getNodeAs<UsingDirectiveDecl>("usingNamespace");
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SourceLocation Loc = U->getBeginLoc();
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if (U->isImplicit() || !Loc.isValid())
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return;
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// Do not warn if namespace is a std namespace with user-defined literals. The
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// user-defined literals can only be used with a using directive.
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if (isStdLiteralsNamespace(U->getNominatedNamespace()))
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return;
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diag(Loc, "do not use namespace using-directives; "
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"use using-declarations instead");
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// TODO: We could suggest a list of using directives replacing the using
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// namespace directive.
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}
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bool UsingNamespaceDirectiveCheck::isStdLiteralsNamespace(
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const NamespaceDecl *NS) {
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if (!NS->getName().endswith("literals"))
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return false;
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const auto *Parent = dyn_cast_or_null<NamespaceDecl>(NS->getParent());
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if (!Parent)
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return false;
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if (Parent->isStdNamespace())
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return true;
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return Parent->getName() == "literals" && Parent->getParent() &&
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Parent->getParent()->isStdNamespace();
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}
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} // namespace build
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} // namespace google
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} // namespace tidy
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} // namespace clang
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