clang-tools 6.0.0

UsingNamespaceDirectiveCheck.cpp
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1 //===--- UsingNamespaceDirectiveCheck.cpp - clang-tidy ----------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "UsingNamespaceDirectiveCheck.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 #include "clang/ASTMatchers/ASTMatchers.h"
14
15 using namespace clang::ast_matchers;
16
17 namespace clang {
18 namespace tidy {
19 namespace google {
20 namespace build {
21
22 void UsingNamespaceDirectiveCheck::registerMatchers(
23 ast_matchers::MatchFinder *Finder) {
24 // Only register the matchers for C++; the functionality currently does not
25 // provide any benefit to other languages, despite being benign.
26 if (getLangOpts().CPlusPlus)
27 Finder->addMatcher(usingDirectiveDecl().bind("usingNamespace"), this);
28 }
29
30 void UsingNamespaceDirectiveCheck::check(
31 const MatchFinder::MatchResult &Result) {
32 const auto *U = Result.Nodes.getNodeAs<UsingDirectiveDecl>("usingNamespace");
33 SourceLocation Loc = U->getLocStart();
34 if (U->isImplicit() || !Loc.isValid())
35 return;
36
37 // Do not warn if namespace is a std namespace with user-defined literals. The
38 // user-defined literals can only be used with a using directive.
39 if (isStdLiteralsNamespace(U->getNominatedNamespace()))
40 return;
41
42 diag(Loc, "do not use namespace using-directives; "
43 "use using-declarations instead");
44 // TODO: We could suggest a list of using directives replacing the using
45 // namespace directive.
46 }
47
48 bool UsingNamespaceDirectiveCheck::isStdLiteralsNamespace(
49 const NamespaceDecl *NS) {
50 if (!NS->getName().endswith("literals"))
51 return false;
52
53 const auto *Parent = dyn_cast_or_null<NamespaceDecl>(NS->getParent());
54 if (!Parent)
55 return false;
56
57 if (Parent->isStdNamespace())
58 return true;
59
60 return Parent->getName() == "literals" && Parent->getParent() &&
61 Parent->getParent()->isStdNamespace();
62 }
63 } // namespace build
64 } // namespace google
65 } // namespace tidy
66 } // namespace clang
Loc
SourceLocation Loc
&#39;#&#39; location in the include directive
Definition: IncludeOrderCheck.cpp:36
clang::ast_matchers
Definition: ClangTidyDiagnosticConsumer.h:27
UsingNamespaceDirectiveCheck.h
clang
Definition: AndroidTidyModule.cpp:28