Added support for C++20 coroutines in class diagrams (#221)

tests/t00069/.clang-uml

@@ -0,0 +1,9 @@
+diagrams:
+  t00069_class:
+    type: class
+    glob:
+      - t00069.cc
+    include:
+      namespaces:
+        - clanguml::t00069
+    using_namespace: clanguml::t00069

tests/t00069/t00069.cc

@@ -0,0 +1,63 @@
+#include <coroutine>
+#include <optional>
+
+namespace clanguml {
+namespace t00069 {
+
+template <typename T> struct generator {
+    struct promise_type;
+    using handle_type = std::coroutine_handle<promise_type>;
+
+    generator(handle_type h)
+        : h_(h)
+    {
+    }
+
+    ~generator() { h_.destroy(); }
+
+    struct promise_type {
+        T value_;
+        std::exception_ptr exception_;
+
+        generator get_return_object()
+        {
+            return generator(handle_type::from_promise(*this));
+        }
+        std::suspend_always initial_suspend() { return {}; }
+
+        std::suspend_always final_suspend() noexcept { return {}; }
+
+        void unhandled_exception() { exception_ = std::current_exception(); }
+
+        template <std::convertible_to<T> From>
+        std::suspend_always yield_value(From &&from)
+        {
+            value_ = std::forward<From>(from);
+            return {};
+        }
+
+        void return_void() { }
+    };
+
+    handle_type h_;
+
+private:
+    bool full_ = false;
+};
+
+class A {
+public:
+    generator<unsigned long> iota() { co_yield counter_++; }
+
+    generator<unsigned long> seed()
+    {
+        counter_ = 42;
+        co_return;
+    }
+
+private:
+    unsigned long counter_;
+};
+
+} // namespace t00069
+} // namespace clanguml

tests/t00069/test_case.h

@@ -0,0 +1,87 @@
+/**
+ * tests/t00069/test_case.h
+ *
+ * Copyright (c) 2021-2023 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("t00069", "[test-case][class]")
+{
+    auto [config, db] = load_config("t00069");
+
+    auto diagram = config.diagrams["t00069_class"];
+
+    REQUIRE(diagram->name == "t00069_class");
+
+    auto model = generate_class_diagram(*db, diagram);
+
+    REQUIRE(model->name() == "t00069_class");
+
+    {
+        auto src = generate_class_puml(diagram, *model);
+        AliasMatcher _A(src);
+
+        REQUIRE_THAT(src, StartsWith("@startuml"));
+        REQUIRE_THAT(src, EndsWith("@enduml\n"));
+
+        // Check if all classes exist
+        REQUIRE_THAT(src, IsClass(_A("A")));
+
+        // Check if class templates exist
+        REQUIRE_THAT(src, IsClassTemplate("generator", "T"));
+
+        // Check if all inner classes exist
+        REQUIRE_THAT(src,
+            IsInnerClass(_A("generator<T>"), _A("generator::promise_type")));
+
+        // Check if all methods exist
+        REQUIRE_THAT(src,
+            (IsMethod<Public, Coroutine>("iota", "generator<unsigned long>")));
+        REQUIRE_THAT(src,
+            (IsMethod<Public, Coroutine>("seed", "generator<unsigned long>")));
+
+        // Check if all relationships exist
+        REQUIRE_THAT(
+            src, IsDependency(_A("A"), _A("generator<unsigned long>")));
+        REQUIRE_THAT(src,
+            IsInstantiation(
+                _A("generator<T>"), _A("generator<unsigned long>")));
+
+        save_puml(config.output_directory(), diagram->name + ".puml", src);
+    }
+
+    {
+        auto j = generate_class_json(diagram, *model);
+
+        using namespace json;
+
+        save_json(config.output_directory(), diagram->name + ".json", j);
+    }
+
+    {
+        auto src = generate_class_mermaid(diagram, *model);
+
+        mermaid::AliasMatcher _A(src);
+        using mermaid::IsClass;
+        using mermaid::IsMethod;
+
+        REQUIRE_THAT(src, IsClass(_A("A")));
+        REQUIRE_THAT(src,
+            (IsMethod<Public, Coroutine>("iota", "generator<unsigned long>")));
+        REQUIRE_THAT(src,
+            (IsMethod<Public, Coroutine>("seed", "generator<unsigned long>")));
+
+        save_mermaid(config.output_directory(), diagram->name + ".mmd", src);
+    }
+}