Added layout hints config option to class diagrams

src/config/config.cc

@@ -204,6 +204,8 @@ using clanguml::common::model::scope_t;
 using clanguml::config::class_diagram;
 using clanguml::config::config;
 using clanguml::config::filter;
+using clanguml::config::hint_t;
+using clanguml::config::layout_hint;
 using clanguml::config::method_arguments;
 using clanguml::config::package_diagram;
 using clanguml::config::plantuml;
@@ -375,6 +377,7 @@ template <> struct convert<class_diagram> {
             return false;
 
         get_option(node, rhs.classes);
+        get_option(node, rhs.layout);
         get_option(node, rhs.include_relations_also_as_members);
         get_option(node, rhs.generate_method_arguments);
 
@@ -410,6 +413,41 @@ template <> struct convert<package_diagram> {
     }
 };
 
+//
+// layout_hint Yaml decoder
+//
+template <> struct convert<layout_hint> {
+    static bool decode(const Node &node, layout_hint &rhs)
+    {
+        assert(node.Type() == NodeType::Map);
+
+        if (node["up"]) {
+            rhs.hint = hint_t::up;
+            rhs.entity = node["up"].as<std::string>();
+        }
+        else if (node["down"]) {
+            rhs.hint = hint_t::down;
+            rhs.entity = node["down"].as<std::string>();
+        }
+        else if (node["left"]) {
+            rhs.hint = hint_t::left;
+            rhs.entity = node["left"].as<std::string>();
+        }
+        else if (node["right"]) {
+            rhs.hint = hint_t::right;
+            rhs.entity = node["right"].as<std::string>();
+        }
+        else if (node["hidden"]) {
+            rhs.hint = hint_t::hidden;
+            rhs.entity = node["hidden"].as<std::string>();
+        }
+        else
+            return false;
+
+        return true;
+    }
+};
+
 //
 // config Yaml decoder
 //

src/config/config.h

@@ -65,6 +65,15 @@ struct filter {
     std::vector<common::model::scope_t> scopes;
 };
 
+enum class hint_t { up, down, left, right, hidden };
+
+struct layout_hint {
+    hint_t hint;
+    std::string entity;
+};
+
+using layout_hints = std::map<std::string, std::vector<layout_hint>>;
+
 std::string to_string(const diagram_type t);
 
 struct inheritable_diagram_options {
@@ -109,6 +118,7 @@ struct class_diagram : public diagram {
     diagram_type type() const override;
 
     option<std::vector<std::string>> classes{"classes"};
+    option<layout_hints> layout{"layout"};
 
     bool has_class(std::string clazz);
 };

tests/test_config.cc

@@ -78,3 +78,27 @@ TEST_CASE("Test config includes", "[unit-test]")
     CHECK(cus.generate_method_arguments() ==
         clanguml::config::method_arguments::none);
 }
+
+TEST_CASE("Test config layout", "[unit-test]")
+{
+    auto cfg = clanguml::config::load("./test_config_data/layout.yml");
+
+    CHECK(cfg.diagrams.size() == 1);
+    auto &def = static_cast<clanguml::config::class_diagram &>(
+        *cfg.diagrams["class_main"]);
+    CHECK(def.type() == clanguml::config::diagram_type::class_diagram);
+
+    CHECK(def.layout().at("ABCD").size() == 2);
+    CHECK(def.layout().at("ABCD")[0].hint == clanguml::config::hint_t::up);
+    CHECK(def.layout().at("ABCD")[0].entity == "ABCD_SUBCLASS");
+    CHECK(def.layout().at("ABCD")[1].hint == clanguml::config::hint_t::left);
+    CHECK(def.layout().at("ABCD")[1].entity == "ABCD_SIBLING");
+
+    CHECK(def.layout().at("ABCD_SIBLING").size() == 2);
+    CHECK(def.layout().at("ABCD_SIBLING")[0].hint ==
+        clanguml::config::hint_t::right);
+    CHECK(def.layout().at("ABCD_SIBLING")[0].entity == "ABCD_OTHER_SIBLING");
+    CHECK(def.layout().at("ABCD_SIBLING")[1].hint ==
+        clanguml::config::hint_t::down);
+    CHECK(def.layout().at("ABCD_SIBLING")[1].entity == "ABCD_SIBLING_SIBLING");
+}

tests/test_config_data/layout.yml

@@ -0,0 +1,22 @@
+compilation_database_dir: debug
+output_directory: output
+diagrams:
+  class_main:
+    type: class
+    glob:
+      - src/**/*.cc
+      - src/**/*.h
+    using_namespace:
+      - clanguml
+    generate_method_arguments: full
+    layout:
+      ABCD:
+        - up: ABCD_SUBCLASS
+        - left: ABCD_SIBLING
+      ABCD_SIBLING:
+        - right: ABCD_OTHER_SIBLING
+        - down: ABCD_SIBLING_SIBLING
+    include:
+      namespaces:
+        - clanguml
+        - ABCD