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 build {
20 
21 void UsingNamespaceDirectiveCheck::registerMatchers(
22     ast_matchers::MatchFinder *Finder) {
23   Finder->addMatcher(usingDirectiveDecl().bind("usingNamespace"), this);
24 }
25 
26 void
27 UsingNamespaceDirectiveCheck::check(const MatchFinder::MatchResult &Result) {
28   const auto *U = Result.Nodes.getNodeAs<UsingDirectiveDecl>("usingNamespace");
29   SourceLocation Loc = U->getLocStart();
30   if (U->isImplicit() || !Loc.isValid())
31     return;
32 
33   diag(Loc, "do not use namespace using-directives. Use using-declarations "
34             "instead.");
35   // TODO: We could suggest a list of using directives replacing the using
36   //       namespace directive.
37 }
38 
39 } // namespace build
40 } // namespace tidy
41 } // namespace clang
42