Added support for 'together' option in class diagrams with rendered namespaces

src/common/generators/nested_element_stack.h

@@ -0,0 +1,74 @@
+/**
+ * src/common/generators/nested_element_stack.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.
+ */
+#pragma once
+
+#include <map>
+#include <string>
+#include <vector>
+
+namespace clanguml::common::generators {
+
+template <typename T> class nested_element_stack {
+public:
+    nested_element_stack(bool is_flat)
+        : is_flat_{is_flat}
+        , current_level_{0}
+    {
+        current_level_groups_.push_back({});
+    }
+
+    void enter()
+    {
+        if (!is_flat_)
+            current_level_++;
+
+        current_level_groups_.push_back({});
+    }
+
+    void leave()
+    {
+        if (!is_flat_)
+            current_level_--;
+
+        current_level_groups_.pop_back();
+    }
+
+    void group_together(const std::string &group_name, T *e)
+    {
+        current_level_groups_[current_level_][group_name].push_back(e);
+    }
+
+    const std::map<std::string, std::vector<T *>> &get_current_groups()
+    {
+        return current_level_groups_.at(current_level_);
+    }
+
+    const std::vector<T *> &get_group(const std::string &group_name)
+    {
+        return get_current_groups().at(group_name);
+    }
+
+private:
+    bool is_flat_;
+
+    uint32_t current_level_;
+
+    std::vector<std::map<std::string, std::vector<T *>>> current_level_groups_;
+};
+
+} // namespace clanguml::common::generators