Add matcher for NamespaceDecls.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179027 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/ASTMatchers/ASTMatchers.h

@@ -129,7 +129,8 @@ typedef internal::Matcher<NestedNameSpecifierLoc> NestedNameSpecifierLocMatcher;
 /// \endcode
 ///
 /// Usable as: Any Matcher
-inline internal::PolymorphicMatcherWithParam0<internal::TrueMatcher> anything() {
+inline internal::PolymorphicMatcherWithParam0<internal::TrueMatcher>
+anything() {
   return internal::PolymorphicMatcherWithParam0<internal::TrueMatcher>();
 }
 
@@ -157,6 +158,17 @@ const internal::VariadicAllOfMatcher<Decl> decl;
 /// \endcode
 const internal::VariadicDynCastAllOfMatcher<Decl, NamedDecl> namedDecl;
 
+/// \brief Matches a declaration of a namespace.
+///
+/// Given
+/// \code
+///   namespace {}
+///   namespace test {}
+/// \endcode
+/// namespaceDecl()
+///   matches "namespace {}" and "namespace test {}"
+const internal::VariadicDynCastAllOfMatcher<Decl, NamespaceDecl> namespaceDecl;
+
 /// \brief Matches C++ class declarations.
 ///
 /// Example matches \c X, \c Z

unittests/ASTMatchers/ASTMatchersTest.cpp

@@ -337,14 +337,22 @@ TEST(DeclarationMatcher, hasDeclContext) {
       "    class D {};"
       "  }"
       "}",
-      recordDecl(hasDeclContext(namedDecl(hasName("M"))))));
+      recordDecl(hasDeclContext(namespaceDecl(hasName("M"))))));
   EXPECT_TRUE(notMatches(
       "namespace N {"
       "  namespace M {"
       "    class D {};"
       "  }"
       "}",
-      recordDecl(hasDeclContext(namedDecl(hasName("N"))))));
+      recordDecl(hasDeclContext(namespaceDecl(hasName("N"))))));
+
+  EXPECT_TRUE(matches("namespace {"
+                      "  namespace M {"
+                      "    class D {};"
+                      "  }"
+                      "}",
+                      recordDecl(hasDeclContext(namespaceDecl(
+                          hasName("M"), hasDeclContext(namespaceDecl()))))));
 }
 
 TEST(ClassTemplate, DoesNotMatchClass) {