Added json class generator test cases

src/class_diagram/generators/json/class_diagram_generator.cc

@@ -34,6 +34,9 @@ void to_json(nlohmann::json &j, const element &c)
         {"namespace", c.get_namespace().to_string()}, {"type", c.type_name()},
         {"display_name", c.full_name(false)}};
 
+    if (c.comment())
+        j["comment"] = c.comment().value();
+
     if (!c.file().empty())
         j["source_location"] =
             dynamic_cast<const common::model::source_location &>(c);
@@ -60,7 +63,12 @@ void to_json(nlohmann::json &j, const relationship &c)
         j["multiplicity_source"] = c.multiplicity_source();
     if (!c.multiplicity_destination().empty())
         j["multiplicity_destination"] = c.multiplicity_destination();
-    j["access"] = to_string(c.access());
+    if (c.access() != access_t::kNone)
+        j["access"] = to_string(c.access());
+    if (!c.label().empty())
+        j["label"] = c.label();
+    if (c.comment())
+        j["comment"] = c.comment().value();
 }
 
 }
@@ -69,11 +77,15 @@ namespace clanguml::class_diagram::model {
 using nlohmann::json;
 void to_json(nlohmann::json &j, const class_element &c)
 {
-    j = {{"name", c.name()}, {"type", c.type()},
+    j["name"] = c.name();
-        {"access", to_string(c.access())}};
+    j["type"] = c.type();
+    if (c.access() != common::model::access_t::kNone)
+        j["access"] = to_string(c.access());
     if (!c.file().empty())
         j["source_location"] =
             dynamic_cast<const common::model::source_location &>(c);
+    if (c.comment())
+        j["comment"] = c.comment().value();
 }
 
 void to_json(nlohmann::json &j, const class_member &c)
@@ -92,6 +104,8 @@ void to_json(nlohmann::json &j, const method_parameter &c)
 
 void to_json(nlohmann::json &j, const class_method &c)
 {
+    j = dynamic_cast<const class_element &>(c);
+
     j["is_static"] = c.is_static();
     j["is_const"] = c.is_const();
     j["is_defaulted"] = c.is_defaulted();
@@ -106,7 +120,8 @@ void to_json(nlohmann::json &j, const class_parent &c)
 {
     j["is_virtual"] = c.is_virtual();
     j["id"] = std::to_string(c.id());
-    j["access"] = to_string(c.access());
+    if (c.access() != common::model::access_t::kNone)
+        j["access"] = to_string(c.access());
     j["name"] = c.name();
 }
 
@@ -152,6 +167,8 @@ void generator::generate(std::ostream &ostr) const
 {
     generate_top_level_elements(json_);
 
+    generate_relationships(json_);
+
     ostr << json_;
 }
 
@@ -167,6 +184,16 @@ void generator::generate_top_level_elements(nlohmann::json &parent) const
                 generate(*cls, parent);
             }
         }
+        else if (auto *enm = dynamic_cast<enum_ *>(p.get()); enm) {
+            if (m_model.should_include(*enm)) {
+                generate(*enm, parent);
+            }
+        }
+        else if (auto *cpt = dynamic_cast<concept_ *>(p.get()); cpt) {
+            if (m_model.should_include(*cpt)) {
+                generate(*cpt, parent);
+            }
+        }
     }
 }
 
@@ -177,11 +204,11 @@ void generator::generate(const package &p, nlohmann::json &parent) const
     nlohmann::json package_object;
 
     if (m_config.generate_packages()) {
-        LOG_DBG("Generating package {}", p.name());
-
         // Don't generate packages from namespaces filtered out by
         // using_namespace
         if (!uns.starts_with({p.full_name(false)})) {
+            LOG_DBG("Generating package {}", p.name());
+
             package_object["type"] = "namespace";
             package_object["name"] = p.name();
             package_object["display_name"] = p.full_name(false);
@@ -190,7 +217,6 @@ void generator::generate(const package &p, nlohmann::json &parent) const
 
     for (const auto &subpackage : p) {
         if (dynamic_cast<package *>(subpackage.get()) != nullptr) {
-            // TODO: add option - generate_empty_packages
             const auto &sp = dynamic_cast<package &>(*subpackage);
             if (!sp.is_empty()) {
                 if (m_config.generate_packages())
@@ -200,35 +226,32 @@ void generator::generate(const package &p, nlohmann::json &parent) const
             }
         }
         else if (auto *cls = dynamic_cast<class_ *>(subpackage.get()); cls) {
-            const auto &sp = dynamic_cast<class_ &>(*subpackage);
+            if (m_model.should_include(*cls)) {
-            if (m_model.should_include(*subpackage)) {
                 if (m_config.generate_packages())
-                    generate(sp, package_object);
+                    generate(*cls, package_object);
                 else
-                    generate(sp, parent);
+                    generate(*cls, parent);
             }
         }
         else if (auto *enm = dynamic_cast<enum_ *>(subpackage.get()); enm) {
-            const auto &sp = dynamic_cast<enum_ &>(*subpackage);
+            if (m_model.should_include(*enm)) {
-            if (m_model.should_include(*subpackage)) {
                 if (m_config.generate_packages())
-                    generate(sp, package_object);
+                    generate(*enm, package_object);
                 else
-                    generate(sp, parent);
+                    generate(*enm, parent);
             }
         }
         else if (auto *cpt = dynamic_cast<concept_ *>(subpackage.get()); cpt) {
-            const auto &sp = dynamic_cast<concept_ &>(*subpackage);
+            if (m_model.should_include(*cpt)) {
-            if (m_model.should_include(*subpackage)) {
                 if (m_config.generate_packages())
-                    generate(sp, package_object);
+                    generate(*cpt, package_object);
                 else
-                    generate(sp, parent);
+                    generate(*cpt, parent);
             }
         }
     }
 
-    if (m_config.generate_packages()) {
+    if (m_config.generate_packages() && !package_object.empty()) {
         parent["elements"].push_back(std::move(package_object));
     }
 }
@@ -236,20 +259,19 @@ void generator::generate(const package &p, nlohmann::json &parent) const
 void generator::generate(const class_ &c, nlohmann::json &parent) const
 {
     nlohmann::json object = c;
-    json_["elements"].push_back(std::move(object));
+    parent["elements"].push_back(std::move(object));
 }
 
 void generator::generate(const enum_ &e, nlohmann::json &parent) const
 {
     nlohmann::json object = e;
-    json_["elements"].push_back(std::move(object));
+    parent["elements"].push_back(std::move(object));
 }
 
 void generator::generate(const concept_ &c, nlohmann::json &parent) const
 {
     nlohmann::json object = c;
-    json_["elements"].push_back(std::move(object));
+    parent["elements"].push_back(std::move(object));
-    generate_relationships(json_);
 }
 
 void generator::generate_relationships(nlohmann::json &parent) const
@@ -280,6 +302,14 @@ void generator::generate_relationships(
     const class_ &c, nlohmann::json &parent) const
 {
     for (const auto &r : c.relationships()) {
+        auto target_element = m_model.get(r.destination());
+        if (!target_element.has_value()) {
+            LOG_DBG("Skipping {} relation from {} to {} due "
+                    "to unresolved destination id",
+                to_string(r.type()), c.full_name(), r.destination());
+            continue;
+        }
+
         nlohmann::json rel = r;
         rel["source"] = std::to_string(c.id());
         parent["relationships"].push_back(rel);
@@ -300,6 +330,14 @@ void generator::generate_relationships(
     const enum_ &c, nlohmann::json &parent) const
 {
     for (const auto &r : c.relationships()) {
+        auto target_element = m_model.get(r.destination());
+        if (!target_element.has_value()) {
+            LOG_DBG("Skipping {} relation from {} to {} due "
+                    "to unresolved destination id",
+                to_string(r.type()), c.full_name(), r.destination());
+            continue;
+        }
+
         nlohmann::json rel = r;
         rel["source"] = std::to_string(c.id());
         parent["relationships"].push_back(rel);
@@ -310,6 +348,14 @@ void generator::generate_relationships(
     const concept_ &c, nlohmann::json &parent) const
 {
     for (const auto &r : c.relationships()) {
+        auto target_element = m_model.get(r.destination());
+        if (!target_element.has_value()) {
+            LOG_DBG("Skipping {} relation from {} to {} due "
+                    "to unresolved destination id",
+                to_string(r.type()), c.full_name(), r.destination());
+            continue;
+        }
+
         nlohmann::json rel = r;
         rel["source"] = std::to_string(c.id());
         parent["relationships"].push_back(rel);
@@ -319,6 +365,31 @@ void generator::generate_relationships(
 void generator::generate_relationships(
     const package &p, nlohmann::json &parent) const
 {
+    for (const auto &subpackage : p) {
+        if (dynamic_cast<package *>(subpackage.get()) != nullptr) {
+            const auto &sp = dynamic_cast<package &>(*subpackage);
+            if (!sp.is_empty())
+                generate_relationships(sp, parent);
+        }
+        else if (dynamic_cast<class_ *>(subpackage.get()) != nullptr) {
+            if (m_model.should_include(*subpackage)) {
+                generate_relationships(
+                    dynamic_cast<class_ &>(*subpackage), parent);
+            }
+        }
+        else if (dynamic_cast<enum_ *>(subpackage.get()) != nullptr) {
+            if (m_model.should_include(*subpackage)) {
+                generate_relationships(
+                    dynamic_cast<enum_ &>(*subpackage), parent);
+            }
+        }
+        else if (dynamic_cast<concept_ *>(subpackage.get()) != nullptr) {
+            if (m_model.should_include(*subpackage)) {
+                generate_relationships(
+                    dynamic_cast<concept_ &>(*subpackage), parent);
+            }
+        }
+    }
 }
 
 } // namespace clanguml::class_diagram::generators::plantuml

tests/t00002/test_case.h

@@ -74,4 +74,445 @@ TEST_CASE("t00002", "[test-case][class]")
             "This is class B"));
 
     save_puml(config.output_directory() + "/" + diagram->name + ".puml", puml);
+
+    const std::string expected_json = R"##(
+{
+  "elements": [
+    {
+      "bases": [],
+      "comment": {
+        "brief": [
+          " This is class A\n"
+        ],
+        "formatted": "\\brief This is class A",
+        "paragraph": [
+          " \n"
+        ],
+        "raw": "/// \\brief This is class A",
+        "text": "\n \n"
+      },
+      "display_name": "clanguml::t00002::A",
+      "id": "987634239855407298",
+      "is_abstract": true,
+      "is_nested": false,
+      "is_struct": false,
+      "is_template": false,
+      "is_union": false,
+      "members": [],
+      "methods": [
+        {
+          "access": "public",
+          "comment": {
+            "formatted": "Abstract foo_a",
+            "paragraph": [
+              " Abstract foo_a\n"
+            ],
+            "raw": "/// Abstract foo_a",
+            "text": "\n Abstract foo_a\n"
+          },
+          "is_const": false,
+          "is_defaulted": false,
+          "is_implicit": false,
+          "is_pure_virtual": true,
+          "is_static": false,
+          "is_virtual": true,
+          "name": "foo_a",
+          "parameters": [],
+          "type": "void"
+        },
+        {
+          "access": "public",
+          "comment": {
+            "formatted": "Abstract foo_c",
+            "paragraph": [
+              " Abstract foo_c\n"
+            ],
+            "raw": "/// Abstract foo_c",
+            "text": "\n Abstract foo_c\n"
+          },
+          "is_const": false,
+          "is_defaulted": false,
+          "is_implicit": false,
+          "is_pure_virtual": true,
+          "is_static": false,
+          "is_virtual": true,
+          "name": "foo_c",
+          "parameters": [],
+          "type": "void"
+        }
+      ],
+      "name": "A",
+      "namespace": "clanguml::t00002",
+      "source_location": {
+        "file": "/home/bartek/devel/clang-uml/tests/t00002/t00002.cc",
+        "line": 7
+      },
+      "template_parameters": [],
+      "type": "class"
+    },
+    {
+      "bases": [
+        {
+          "access": "public",
+          "id": "987634239855407298",
+          "is_virtual": false,
+          "name": "clanguml::t00002::A"
+        }
+      ],
+      "comment": {
+        "brief": [
+          " This is class B\n"
+        ],
+        "formatted": "\\brief This is class B",
+        "paragraph": [
+          " \n"
+        ],
+        "raw": "/// \\brief This is class B",
+        "text": "\n \n"
+      },
+      "display_name": "clanguml::t00002::B",
+      "id": "594234458687375950",
+      "is_abstract": false,
+      "is_nested": false,
+      "is_struct": false,
+      "is_template": false,
+      "is_union": false,
+      "members": [],
+      "methods": [
+        {
+          "access": "public",
+          "is_const": false,
+          "is_defaulted": false,
+          "is_implicit": false,
+          "is_pure_virtual": false,
+          "is_static": false,
+          "is_virtual": true,
+          "name": "foo_a",
+          "parameters": [],
+          "type": "void"
+        }
+      ],
+      "name": "B",
+      "namespace": "clanguml::t00002",
+      "source_location": {
+        "file": "/home/bartek/devel/clang-uml/tests/t00002/t00002.cc",
+        "line": 16
+      },
+      "template_parameters": [],
+      "type": "class"
+    },
+    {
+      "bases": [
+        {
+          "access": "public",
+          "id": "987634239855407298",
+          "is_virtual": false,
+          "name": "clanguml::t00002::A"
+        }
+      ],
+      "comment": {
+        "brief": [
+          " This is class C - class C has a long comment\n"
+        ],
+        "formatted": "@brief This is class C - class C has a long comment\n\nVivamus integer non suscipit taciti mus etiam at primis tempor sagittis sit,\neuismod libero facilisi aptent elementum felis blandit cursus gravida sociis\nerat ante, eleifend lectus nullam dapibus netus feugiat curae curabitur est\nad.",
+        "paragraph": [
+          " \n",
+          " Vivamus integer non suscipit taciti mus etiam at primis tempor sagittis sit,\n euismod libero facilisi aptent elementum felis blandit cursus gravida sociis\n erat ante, eleifend lectus nullam dapibus netus feugiat curae curabitur est\n ad.\n"
+        ],
+        "raw": "/// @brief This is class C - class C has a long comment\n///\n/// Vivamus integer non suscipit taciti mus etiam at primis tempor sagittis sit,\n/// euismod libero facilisi aptent elementum felis blandit cursus gravida sociis\n/// erat ante, eleifend lectus nullam dapibus netus feugiat curae curabitur est\n/// ad.",
+        "text": "\n \n\n Vivamus integer non suscipit taciti mus etiam at primis tempor sagittis sit,\n euismod libero facilisi aptent elementum felis blandit cursus gravida sociis\n erat ante, eleifend lectus nullam dapibus netus feugiat curae curabitur est\n ad.\n"
+      },
+      "display_name": "clanguml::t00002::C",
+      "id": "1142499429598587507",
+      "is_abstract": false,
+      "is_nested": false,
+      "is_struct": false,
+      "is_template": false,
+      "is_union": false,
+      "members": [],
+      "methods": [
+        {
+          "access": "public",
+          "comment": {
+            "formatted": "Do nothing unless override is provided",
+            "paragraph": [
+              " Do nothing unless override is provided\n"
+            ],
+            "raw": "/// Do nothing unless override is provided",
+            "text": "\n Do nothing unless override is provided\n"
+          },
+          "is_const": false,
+          "is_defaulted": false,
+          "is_implicit": false,
+          "is_pure_virtual": false,
+          "is_static": false,
+          "is_virtual": true,
+          "name": "foo_c",
+          "parameters": [],
+          "type": "void"
+        }
+      ],
+      "name": "C",
+      "namespace": "clanguml::t00002",
+      "source_location": {
+        "file": "/home/bartek/devel/clang-uml/tests/t00002/t00002.cc",
+        "line": 27
+      },
+      "template_parameters": [],
+      "type": "class"
+    },
+    {
+      "bases": [
+        {
+          "access": "public",
+          "id": "594234458687375950",
+          "is_virtual": false,
+          "name": "clanguml::t00002::B"
+        },
+        {
+          "access": "public",
+          "id": "1142499429598587507",
+          "is_virtual": false,
+          "name": "clanguml::t00002::C"
+        }
+      ],
+      "comment": {
+        "formatted": "This is class D\nwhich is a little like B\nand a little like C",
+        "paragraph": [
+          " This is class D\n which is a little like B\n and a little like C\n"
+        ],
+        "raw": "/// This is class D\n/// which is a little like B\n/// and a little like C",
+        "text": "\n This is class D\n which is a little like B\n and a little like C\n"
+      },
+      "display_name": "clanguml::t00002::D",
+      "id": "60950494980414724",
+      "is_abstract": false,
+      "is_nested": false,
+      "is_struct": false,
+      "is_template": false,
+      "is_union": false,
+      "members": [
+        {
+          "access": "private",
+          "comment": {
+            "formatted": "All the A pointers",
+            "paragraph": [
+              " All the A pointers\n"
+            ],
+            "raw": "/// All the A pointers",
+            "text": "\n All the A pointers\n"
+          },
+          "is_static": false,
+          "name": "as",
+          "source_location": {
+            "file": "/home/bartek/devel/clang-uml/tests/t00002/t00002.cc",
+            "line": 58
+          },
+          "type": "std::vector<A *>"
+        }
+      ],
+      "methods": [
+        {
+          "access": "public",
+          "comment": {
+            "formatted": "\n Forward foo_a\n     ",
+            "paragraph": [
+              " Forward foo_a\n"
+            ],
+            "raw": "/**\n     * Forward foo_a\n     */",
+            "text": "\n Forward foo_a\n"
+          },
+          "is_const": false,
+          "is_defaulted": false,
+          "is_implicit": false,
+          "is_pure_virtual": false,
+          "is_static": false,
+          "is_virtual": true,
+          "name": "foo_a",
+          "parameters": [],
+          "type": "void"
+        },
+        {
+          "access": "public",
+          "comment": {
+            "formatted": "\n Forward foo_c\n     ",
+            "paragraph": [
+              " Forward foo_c\n"
+            ],
+            "raw": "/**\n     * Forward foo_c\n     */",
+            "text": "\n Forward foo_c\n"
+          },
+          "is_const": false,
+          "is_defaulted": false,
+          "is_implicit": false,
+          "is_pure_virtual": false,
+          "is_static": false,
+          "is_virtual": true,
+          "name": "foo_c",
+          "parameters": [],
+          "type": "void"
+        }
+      ],
+      "name": "D",
+      "namespace": "clanguml::t00002",
+      "source_location": {
+        "file": "/home/bartek/devel/clang-uml/tests/t00002/t00002.cc",
+        "line": 36
+      },
+      "template_parameters": [],
+      "type": "class"
+    },
+    {
+      "bases": [
+        {
+          "access": "public",
+          "id": "594234458687375950",
+          "is_virtual": true,
+          "name": "clanguml::t00002::B"
+        },
+        {
+          "access": "public",
+          "id": "1142499429598587507",
+          "is_virtual": true,
+          "name": "clanguml::t00002::C"
+        }
+      ],
+      "display_name": "clanguml::t00002::E",
+      "id": "2237886670308966220",
+      "is_abstract": false,
+      "is_nested": false,
+      "is_struct": false,
+      "is_template": false,
+      "is_union": false,
+      "members": [
+        {
+          "access": "private",
+          "comment": {
+            "formatted": "All the A pointers",
+            "paragraph": [
+              " All the A pointers\n"
+            ],
+            "raw": "/// All the A pointers",
+            "text": "\n All the A pointers\n"
+          },
+          "is_static": false,
+          "name": "as",
+          "source_location": {
+            "file": "/home/bartek/devel/clang-uml/tests/t00002/t00002.cc",
+            "line": 83
+          },
+          "type": "std::vector<A *>"
+        }
+      ],
+      "methods": [
+        {
+          "access": "public",
+          "comment": {
+            "formatted": "\n Forward foo_a",
+            "paragraph": [
+              " Forward foo_a\n"
+            ],
+            "raw": "///\n    /// Forward foo_a\n    ///",
+            "text": "\n Forward foo_a\n"
+          },
+          "is_const": false,
+          "is_defaulted": false,
+          "is_implicit": false,
+          "is_pure_virtual": false,
+          "is_static": false,
+          "is_virtual": true,
+          "name": "foo_a",
+          "parameters": [],
+          "type": "void"
+        },
+        {
+          "access": "public",
+          "comment": {
+            "formatted": "\n Forward foo_c",
+            "paragraph": [
+              " Forward foo_c\n"
+            ],
+            "raw": "///\n    /// Forward foo_c\n    ///",
+            "text": "\n Forward foo_c\n"
+          },
+          "is_const": false,
+          "is_defaulted": false,
+          "is_implicit": false,
+          "is_pure_virtual": false,
+          "is_static": false,
+          "is_virtual": true,
+          "name": "foo_c",
+          "parameters": [],
+          "type": "void"
+        }
+      ],
+      "name": "E",
+      "namespace": "clanguml::t00002",
+      "source_location": {
+        "file": "/home/bartek/devel/clang-uml/tests/t00002/t00002.cc",
+        "line": 61
+      },
+      "template_parameters": [],
+      "type": "class"
+    }
+  ],
+  "relationships": [
+    {
+      "access": "public",
+      "destination": "987634239855407298",
+      "source": "594234458687375950",
+      "type": "extension"
+    },
+    {
+      "access": "public",
+      "destination": "987634239855407298",
+      "source": "1142499429598587507",
+      "type": "extension"
+    },
+    {
+      "access": "private",
+      "destination": "987634239855407298",
+      "label": "as",
+      "source": "60950494980414724",
+      "type": "association"
+    },
+    {
+      "access": "public",
+      "destination": "594234458687375950",
+      "source": "60950494980414724",
+      "type": "extension"
+    },
+    {
+      "access": "public",
+      "destination": "1142499429598587507",
+      "source": "60950494980414724",
+      "type": "extension"
+    },
+    {
+      "access": "private",
+      "destination": "987634239855407298",
+      "label": "as",
+      "source": "2237886670308966220",
+      "type": "association"
+    },
+    {
+      "access": "public",
+      "destination": "594234458687375950",
+      "source": "2237886670308966220",
+      "type": "extension"
+    },
+    {
+      "access": "public",
+      "destination": "1142499429598587507",
+      "source": "2237886670308966220",
+      "type": "extension"
+    }
+  ]
 }
+)##";
+    auto j = generate_class_json(diagram, *model);
+
+    REQUIRE(j == nlohmann::json::parse(expected_json));
+
+    save_json(config.output_directory() + "/" + diagram->name + ".json", j);
+}

tests/t00036/test_case.h

@@ -46,4 +46,197 @@ TEST_CASE("t00036", "[test-case][class]")
     REQUIRE_THAT(puml, IsAggregation(_A("B"), _A("A<int>"), "+a_int"));
 
     save_puml(config.output_directory() + "/" + diagram->name + ".puml", puml);
+
+    const std::string expected_json = R"##(
+{
+  "elements": [
+    {
+      "display_name": "clanguml::t00036::ns1",
+      "elements": [
+        {
+          "constants": [
+            "blue",
+            "yellow"
+          ],
+          "display_name": "clanguml::t00036::ns1::E",
+          "id": "2144761953049158478",
+          "is_nested": false,
+          "name": "E",
+          "namespace": "clanguml::t00036::ns1",
+          "source_location": {
+            "file": "/home/bartek/devel/clang-uml/tests/t00036/t00036.cc",
+            "line": 6
+          },
+          "type": "enum"
+        },
+        {
+          "display_name": "clanguml::t00036::ns1::ns11",
+          "elements": [
+            {
+              "bases": [],
+              "display_name": "clanguml::t00036::ns1::ns11::A<T>",
+              "id": "571573305652194946",
+              "is_abstract": false,
+              "is_nested": false,
+              "is_struct": true,
+              "is_template": false,
+              "is_union": false,
+              "members": [
+                {
+                  "access": "public",
+                  "is_static": false,
+                  "name": "a",
+                  "source_location": {
+                    "file": "/home/bartek/devel/clang-uml/tests/t00036/t00036.cc",
+                    "line": 11
+                  },
+                  "type": "T"
+                }
+              ],
+              "methods": [],
+              "name": "A",
+              "namespace": "clanguml::t00036::ns1::ns11",
+              "source_location": {
+                "file": "/home/bartek/devel/clang-uml/tests/t00036/t00036.cc",
+                "line": 10
+              },
+              "template_parameters": [
+                {
+                  "is_template_parameter": true,
+                  "is_template_template_parameter": false,
+                  "is_variadic": false,
+                  "name": "T",
+                  "type": ""
+                }
+              ],
+              "type": "class"
+            },
+            {
+              "display_name": "clanguml::t00036::ns1::ns11::ns111",
+              "elements": [
+                {
+                  "bases": [],
+                  "display_name": "clanguml::t00036::ns1::ns11::ns111::B",
+                  "id": "1964031933563607376",
+                  "is_abstract": false,
+                  "is_nested": false,
+                  "is_struct": true,
+                  "is_template": false,
+                  "is_union": false,
+                  "members": [
+                    {
+                      "access": "public",
+                      "is_static": false,
+                      "name": "a_int",
+                      "source_location": {
+                        "file": "/home/bartek/devel/clang-uml/tests/t00036/t00036.cc",
+                        "line": 17
+                      },
+                      "type": "A<int>"
+                    }
+                  ],
+                  "methods": [],
+                  "name": "B",
+                  "namespace": "clanguml::t00036::ns1::ns11::ns111",
+                  "source_location": {
+                    "file": "/home/bartek/devel/clang-uml/tests/t00036/t00036.cc",
+                    "line": 16
+                  },
+                  "template_parameters": [],
+                  "type": "class"
+                }
+              ],
+              "name": "ns111",
+              "type": "namespace"
+            },
+            {
+              "bases": [],
+              "display_name": "clanguml::t00036::ns1::ns11::A<int>",
+              "id": "1832710427462319797",
+              "is_abstract": false,
+              "is_nested": false,
+              "is_struct": false,
+              "is_template": false,
+              "is_union": false,
+              "members": [],
+              "methods": [],
+              "name": "A",
+              "namespace": "clanguml::t00036::ns1::ns11",
+              "template_parameters": [
+                {
+                  "is_template_parameter": false,
+                  "is_template_template_parameter": false,
+                  "is_variadic": false,
+                  "name": "int",
+                  "type": ""
+                }
+              ],
+              "type": "class"
+            }
+          ],
+          "name": "ns11",
+          "type": "namespace"
+        }
+      ],
+      "name": "ns1",
+      "type": "namespace"
+    },
+    {
+      "display_name": "clanguml::t00036::ns2",
+      "elements": [
+        {
+          "display_name": "clanguml::t00036::ns2::ns22",
+          "elements": [
+            {
+              "bases": [],
+              "display_name": "clanguml::t00036::ns2::ns22::C",
+              "id": "2038956882066165590",
+              "is_abstract": false,
+              "is_nested": false,
+              "is_struct": true,
+              "is_template": false,
+              "is_union": false,
+              "members": [],
+              "methods": [],
+              "name": "C",
+              "namespace": "clanguml::t00036::ns2::ns22",
+              "source_location": {
+                "file": "/home/bartek/devel/clang-uml/tests/t00036/t00036.cc",
+                "line": 28
+              },
+              "template_parameters": [],
+              "type": "class"
+            }
+          ],
+          "name": "ns22",
+          "type": "namespace"
+        }
+      ],
+      "name": "ns2",
+      "type": "namespace"
+    }
+  ],
+  "relationships": [
+    {
+      "access": "public",
+      "destination": "1832710427462319797",
+      "label": "a_int",
+      "source": "1964031933563607376",
+      "type": "aggregation"
+    },
+    {
+      "access": "public",
+      "destination": "571573305652194946",
+      "source": "1832710427462319797",
+      "type": "instantiation"
+    }
+  ]
+}
+)##";
+
+    auto j = generate_class_json(diagram, *model);
+
+    REQUIRE(j == nlohmann::json::parse(expected_json));
+
+    save_json(config.output_directory() + "/" + diagram->name + ".json", j);
 }

tests/test_cases.cc

@@ -156,6 +156,20 @@ std::string generate_class_puml(
     return ss.str();
 }
 
+nlohmann::json generate_class_json(
+    std::shared_ptr<clanguml::config::diagram> config,
+    clanguml::class_diagram::model::diagram &model)
+{
+    using namespace clanguml::class_diagram::generators::json;
+
+    std::stringstream ss;
+
+    ss << generator(
+        dynamic_cast<clanguml::config::class_diagram &>(*config), model);
+
+    return nlohmann::json::parse(ss.str());
+}
+
 std::string generate_package_puml(
     std::shared_ptr<clanguml::config::diagram> config,
     clanguml::package_diagram::model::diagram &model)
@@ -198,6 +212,16 @@ void save_puml(const std::string &path, const std::string &puml)
     ofs.close();
 }
 
+void save_json(const std::string &path, const nlohmann::json &j)
+{
+    std::filesystem::path p{path};
+    std::filesystem::create_directory(p.parent_path());
+    std::ofstream ofs;
+    ofs.open(p, std::ofstream::out | std::ofstream::trunc);
+    ofs << std::setw(2) << j;
+    ofs.close();
+}
+
 using namespace clanguml::test::matchers;
 
 ///