Fix issue when parsing anonymous namespaces

include/cppast/cpp_namespace.hpp

@@ -60,6 +60,12 @@ namespace cppast
             return inline_;
         }
 
+        /// \returns Whether or not the namespace is anonymous.
+        bool is_anonymous() const noexcept
+        {
+            return name().empty();
+        }
+
     private:
         cpp_namespace(std::string name, bool is_inline)
         : cpp_entity(std::move(name)), inline_(is_inline)

src/libclang/namespace_parser.cpp

@@ -27,9 +27,12 @@ namespace
         skip_attribute(stream);
 
         // <identifier> {
+        // or when anonymous: {
+        if (detail::skip_if(stream, "{"))
+            return cpp_namespace::builder("", is_inline);
+
         auto& name = stream.get().value();
         skip(stream, "{");
-
         return cpp_namespace::builder(name.c_str(), is_inline);
     }
 }

test/cpp_namespace.cpp

@@ -29,6 +29,10 @@ namespace c
     /// }
     namespace d {}
 }
+
+/// namespace {
+/// }
+namespace {}
 )";
 
     auto file  = parse({}, "cpp_namespace.cpp", code);
@@ -36,29 +40,39 @@ namespace c
         auto no_children = count_children(ns);
         if (ns.name() == "a")
         {
+            REQUIRE(!ns.is_anonymous());
             REQUIRE(!ns.is_inline());
             REQUIRE(no_children == 0u);
         }
         else if (ns.name() == "b")
         {
+            REQUIRE(!ns.is_anonymous());
             REQUIRE(ns.is_inline());
             REQUIRE(no_children == 0u);
         }
         else if (ns.name() == "c")
         {
+            REQUIRE(!ns.is_anonymous());
             REQUIRE(!ns.is_inline());
             REQUIRE(no_children == 1u);
         }
         else if (ns.name() == "d")
         {
+            REQUIRE(!ns.is_anonymous());
             check_parent(ns, "c", "c::d");
             REQUIRE(!ns.is_inline());
             REQUIRE(no_children == 0u);
         }
+        else if (ns.name() == "")
+        {
+            REQUIRE(ns.is_anonymous());
+            REQUIRE(!ns.is_inline());
+            REQUIRE(no_children == 0u);
+        }
         else
             REQUIRE(false);
     });
-    REQUIRE(count == 4u);
+    REQUIRE(count == 5u);
 }
 
 TEST_CASE("cpp_namespace_alias")