Added recursive template sequence diagram test case

src/sequence_diagram/generators/plantuml/sequence_diagram_generator.cc

@@ -90,10 +90,9 @@ void generator::generate_return(const message &m, std::ostream &ostr) const
 {
     // Add return activity only for messages between different actors and
     // only if the return type is different than void
-    if ((m.from != m.to) && (m.return_type != "void")) {
     const auto &from = m_model.get_participant<model::participant>(m.from);
-        const auto &to = m_model.get_participant<model::participant>(m.to);
+    const auto &to = m_model.get_participant<model::function>(m.to);
-
+    if ((m.from != m.to) && !to.value().is_void()) {
         const std::string from_alias = generate_alias(from.value());
 
         const std::string to_alias = generate_alias(to.value());

src/sequence_diagram/model/participant.cc

@@ -209,6 +209,10 @@ bool function::is_void() const { return is_void_; }
 
 void function::is_void(bool v) { is_void_ = v; }
 
+bool function::is_static() const { return is_static_; }
+
+void function::is_static(bool s) { is_static_ = s; }
+
 void function::add_parameter(const std::string &a) { parameters_.push_back(a); }
 
 const std::vector<std::string> &function::parameters() const
@@ -268,10 +272,6 @@ std::string method::to_string() const
         type_name(), id(), full_name(false), class_id());
 }
 
-bool method::is_static() const { return is_static_; }
-
-void method::is_static(bool s) { is_static_ = s; }
-
 function_template::function_template(
     const common::model::namespace_ &using_namespace)
     : function{using_namespace}

src/sequence_diagram/model/participant.h

@@ -160,6 +160,10 @@ struct function : public participant {
 
     void is_void(bool v);
 
+    bool is_static() const;
+
+    void is_static(bool s);
+
     void add_parameter(const std::string &a);
 
     const std::vector<std::string> &parameters() const;
@@ -167,6 +171,7 @@ struct function : public participant {
 private:
     bool is_const_{false};
     bool is_void_{false};
+    bool is_static_{false};
     std::vector<std::string> parameters_;
 };
 
@@ -200,15 +205,10 @@ struct method : public function {
 
     std::string to_string() const override;
 
-    bool is_static() const;
-
-    void is_static(bool s);
-
 private:
     diagram_element::id_t class_id_;
     std::string method_name_;
     std::string class_full_name_;
-    bool is_static_{false};
 };
 
 struct function_template : public function, public template_trait {

tests/t20018/.clang-uml

@@ -0,0 +1,14 @@
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t20018_sequence:
+    type: sequence
+    glob:
+      - ../../tests/t20018/t20018.cc
+    include:
+      namespaces:
+        - clanguml::t20018
+    using_namespace:
+      - clanguml::t20018
+    start_from:
+      - function: "clanguml::t20018::tmain()"

tests/t20018/t20018.cc

@@ -0,0 +1,20 @@
+#include <iostream>
+
+namespace clanguml {
+namespace t20018 {
+
+template <int N> struct Factorial {
+    static const int value = N * Factorial<N - 1>::value;
+
+    static void print() { Factorial<N - 1>::print(); }
+};
+
+template <> struct Factorial<0> {
+    static const int value = 1;
+
+    static void print() { std::cout << "Hello world\n"; }
+};
+
+void tmain() { Factorial<5>::print(); }
+}
+}

tests/t20018/test_case.h

@@ -0,0 +1,57 @@
+/**
+ * tests/t20018/test_case.h
+ *
+ * Copyright (c) 2021-2022 Bartek Kryza <bkryza@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+TEST_CASE("t20018", "[test-case][sequence]")
+{
+    auto [config, db] = load_config("t20018");
+
+    auto diagram = config.diagrams["t20018_sequence"];
+
+    REQUIRE(diagram->name == "t20018_sequence");
+
+    auto model = generate_sequence_diagram(*db, diagram);
+
+    REQUIRE(model->name() == "t20018_sequence");
+
+    auto puml = generate_sequence_puml(diagram, *model);
+    AliasMatcher _A(puml);
+
+    REQUIRE_THAT(puml, StartsWith("@startuml"));
+    REQUIRE_THAT(puml, EndsWith("@enduml\n"));
+
+    // Check if all calls exist
+    REQUIRE_THAT(
+        puml, HasCall(_A("Factorial<5>"), _A("Factorial<4>"), "__print()__"));
+    REQUIRE_THAT(puml,
+        !HasCallWithResponse(
+            _A("Factorial<5>"), _A("Factorial<4>"), "__print()__"));
+    REQUIRE_THAT(
+        puml, HasCall(_A("Factorial<4>"), _A("Factorial<3>"), "__print()__"));
+    REQUIRE_THAT(
+        puml, HasCall(_A("Factorial<3>"), _A("Factorial<2>"), "__print()__"));
+    REQUIRE_THAT(
+        puml, HasCall(_A("Factorial<2>"), _A("Factorial<1>"), "__print()__"));
+    REQUIRE_THAT(
+        puml, HasCall(_A("Factorial<1>"), _A("Factorial<0>"), "__print()__"));
+
+    // REQUIRE_THAT(puml, HasCall("A", "log_result"));
+    // REQUIRE_THAT(puml, HasCallWithResponse("B", "A", "add3"));
+
+    save_puml(
+        "./" + config.output_directory() + "/" + diagram->name + ".puml", puml);
+}

tests/test_cases.cc

@@ -264,6 +264,7 @@ using namespace clanguml::test::matchers;
 #include "t20015/test_case.h"
 #include "t20016/test_case.h"
 #include "t20017/test_case.h"
+#include "t20018/test_case.h"
 
 ///
 /// Package diagram tests

tests/test_cases.yaml

@@ -199,6 +199,9 @@ test_cases:
     - name: t20017
       title: Test case for combine_free_functions_into_file_participants option
       description:
+    - name: t20018
+      title: Recursive template sequence diagram test case
+      description:
   Package diagrams:
     - name: t30001
       title: Basic package diagram test case