Refactored class diagram visitor

src/main.cc

@@ -23,7 +23,7 @@
 #include "puml/class_diagram_generator.h"
 #include "puml/sequence_diagram_generator.h"
 #include "uml/class_diagram/model/diagram.h"
-#include "uml/class_diagram_visitor.h"
+#include "uml/class_diagram/visitor/translation_unit_visitor.h"
 #include "uml/sequence_diagram_visitor.h"
 #include "util/util.h"
 

src/puml/class_diagram_generator.cc

@@ -439,7 +439,8 @@ clanguml::class_diagram::model::diagram generate(
         type_safe::ref(idx)};
 
     // Process all matching translation units
-    clanguml::visitor::class_diagram::tu_visitor ctx(idx, d, diagram);
+    clanguml::class_diagram::visitor::translation_unit_visitor ctx(
+        idx, d, diagram);
     cppast::parse_files(parser, translation_units, db);
     for (auto &file : parser.files())
         ctx(file);

src/puml/class_diagram_generator.h

@@ -23,7 +23,7 @@
 #include "uml/class_diagram/model/class_relationship.h"
 #include "uml/class_diagram/model/diagram.h"
 #include "uml/class_diagram/model/enum.h"
-#include "uml/class_diagram_visitor.h"
+#include "uml/class_diagram/visitor/translation_unit_visitor.h"
 #include "util/util.h"
 
 #include <cppast/cpp_entity_index.hpp>

src/uml/class_diagram/visitor/element_visitor_context.cc

@@ -0,0 +1,57 @@
+/**
+ * src/uml/class_diagram/model/visitor/element_visitor_context.cc
+ *
+ * Copyright (c) 2021 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.
+ */
+
+#include "element_visitor_context.h"
+
+#include "translation_unit_context.h"
+
+namespace clanguml::class_diagram::visitor {
+
+template <typename T>
+element_visitor_context<T>::element_visitor_context(
+    clanguml::class_diagram::model::diagram &diagram, T &element)
+    : element_{element}
+    , diagram_{diagram}
+{
+}
+
+template <typename T>
+void element_visitor_context<T>::set_parent_class(
+    clanguml::class_diagram::model::class_ *parent_class)
+{
+    parent_class_ = parent_class;
+}
+
+template <typename T>
+clanguml::class_diagram::model::class_ *
+element_visitor_context<T>::parent_class()
+{
+    return parent_class_;
+}
+
+template <typename T> T &element_visitor_context<T>::element()
+{
+    return element_;
+}
+
+template <typename T>
+clanguml::class_diagram::model::diagram &element_visitor_context<T>::diagram()
+{
+    return diagram_;
+}
+}

src/uml/class_diagram/visitor/element_visitor_context.h

@@ -0,0 +1,48 @@
+/**
+ * src/uml/class_diagram/model/visitor/element_visitor_context.h
+ *
+ * Copyright (c) 2021 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 "uml/class_diagram/model/class.h"
+#include "uml/class_diagram/model/diagram.h"
+
+namespace clanguml::class_diagram::visitor {
+
+class translation_unit_context;
+
+template <typename T> class element_visitor_context {
+public:
+    element_visitor_context(
+        clanguml::class_diagram::model::diagram &diagram, T &element);
+
+    void set_parent_class(clanguml::class_diagram::model::class_ *parent_class);
+
+    clanguml::class_diagram::model::class_ *parent_class();
+
+    T &element();
+
+    clanguml::class_diagram::model::diagram &diagram();
+
+private:
+    translation_unit_context *ctx_;
+
+    T &element_;
+    clanguml::class_diagram::model::class_ *parent_class_{};
+    clanguml::class_diagram::model::diagram &diagram_;
+};
+
+}

src/uml/class_diagram/visitor/translation_unit_context.cc

@@ -0,0 +1,135 @@
+/**
+ * src/uml/class_diagram/visitor/translation_unit_context.cc
+ *
+ * Copyright (c) 2021 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.
+ */
+
+#include "translation_unit_context.h"
+
+#include "cx/util.h"
+
+namespace clanguml::class_diagram::visitor {
+
+translation_unit_context::translation_unit_context(
+    cppast::cpp_entity_index &idx,
+    clanguml::class_diagram::model::diagram &diagram,
+    const clanguml::config::class_diagram &config)
+    : entity_index_{idx}
+    , diagram_{diagram}
+    , config_{config}
+{
+}
+
+bool translation_unit_context::has_type_alias(
+    const std::string &full_name) const
+{
+    bool res = alias_index_.find(full_name) != alias_index_.end();
+
+    LOG_DBG("Alias {} {} found in index", full_name, res ? "" : "not");
+
+    return res;
+}
+
+void translation_unit_context::add_type_alias(const std::string &full_name,
+    type_safe::object_ref<const cppast::cpp_type> &&ref)
+{
+    if (!has_type_alias(full_name)) {
+        LOG_DBG("Stored type alias: {} -> {} ", full_name,
+            cppast::to_string(ref.get()));
+
+        alias_index_.emplace(full_name, std::move(ref));
+    }
+}
+
+type_safe::object_ref<const cppast::cpp_type>
+translation_unit_context::get_type_alias(const std::string &full_name) const
+{
+    assert(has_type_alias(full_name));
+
+    return alias_index_.at(full_name);
+}
+
+type_safe::object_ref<const cppast::cpp_type>
+translation_unit_context::get_type_alias_final(const cppast::cpp_type &t) const
+{
+    const auto fn =
+        cx::util::full_name(cppast::remove_cv(t), entity_index_, false);
+
+    if (has_type_alias(fn)) {
+        return get_type_alias_final(alias_index_.at(fn).get());
+    }
+
+    return type_safe::ref(t);
+}
+
+bool translation_unit_context::has_type_alias_template(
+    const std::string &full_name) const
+{
+    bool res =
+        alias_template_index_.find(full_name) != alias_template_index_.end();
+
+    LOG_DBG("Alias template {} {} found in index", full_name, res ? "" : "not");
+
+    return res;
+}
+
+void translation_unit_context::add_type_alias_template(
+    const std::string &full_name,
+    type_safe::object_ref<const cppast::cpp_type> &&ref)
+{
+    if (!has_type_alias_template(full_name)) {
+        LOG_DBG("Stored type alias template for: {} ", full_name);
+
+        alias_template_index_.emplace(full_name, std::move(ref));
+    }
+}
+
+type_safe::object_ref<const cppast::cpp_type>
+translation_unit_context::get_type_alias_template(
+    const std::string &full_name) const
+{
+    assert(has_type_alias_template(full_name));
+
+    return alias_template_index_.at(full_name);
+}
+
+void translation_unit_context::push_namespace(const std::string &ns)
+{
+    namespace_.push_back(ns);
+}
+
+void translation_unit_context::pop_namespace() { namespace_.pop_back(); }
+
+const std::vector<std::string> &translation_unit_context::get_namespace() const
+{
+    return namespace_;
+}
+
+const cppast::cpp_entity_index &translation_unit_context::entity_index() const
+{
+    return entity_index_;
+}
+
+const clanguml::config::class_diagram &translation_unit_context::config() const
+{
+    return config_;
+}
+
+clanguml::class_diagram::model::diagram &translation_unit_context::diagram()
+{
+    return diagram_;
+}
+
+}

src/uml/class_diagram/visitor/translation_unit_context.h

@@ -0,0 +1,87 @@
+/**
+ * src/uml/class_diagram/visitor/translation_unit_context.h
+ *
+ * Copyright (c) 2021 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 "config/config.h"
+
+#include <cppast/cpp_entity_index.hpp>
+#include <cppast/cpp_type.hpp>
+#include <type_safe/reference.hpp>
+
+namespace clanguml::class_diagram::visitor {
+
+class translation_unit_context {
+public:
+    translation_unit_context(cppast::cpp_entity_index &idx,
+        clanguml::class_diagram::model::diagram &diagram,
+        const clanguml::config::class_diagram &config);
+
+    bool has_type_alias(const std::string &full_name) const;
+
+    void add_type_alias(const std::string &full_name,
+        type_safe::object_ref<const cppast::cpp_type> &&ref);
+
+    type_safe::object_ref<const cppast::cpp_type> get_type_alias(
+        const std::string &full_name) const;
+
+    type_safe::object_ref<const cppast::cpp_type> get_type_alias_final(
+        const cppast::cpp_type &t) const;
+
+    bool has_type_alias_template(const std::string &full_name) const;
+
+    void add_type_alias_template(const std::string &full_name,
+        type_safe::object_ref<const cppast::cpp_type> &&ref);
+
+    type_safe::object_ref<const cppast::cpp_type> get_type_alias_template(
+        const std::string &full_name) const;
+
+    void push_namespace(const std::string &ns);
+
+    void pop_namespace();
+
+    const std::vector<std::string> &get_namespace() const;
+
+    const cppast::cpp_entity_index &entity_index() const;
+
+    const clanguml::config::class_diagram &config() const;
+
+    clanguml::class_diagram::model::diagram &diagram();
+
+private:
+    // Current visitor namespace
+    std::vector<std::string> namespace_;
+
+    // Reference to the cppast entity index
+    cppast::cpp_entity_index &entity_index_;
+
+    // Reference to the output diagram model
+    clanguml::class_diagram::model::diagram &diagram_;
+
+    // Reference to class diagram config
+    const clanguml::config::class_diagram &config_;
+
+    // Map of discovered aliases (declared with 'using' keyword)
+    std::map<std::string, type_safe::object_ref<const cppast::cpp_type>>
+        alias_index_;
+
+    // Map of discovered template aliases (declared with 'using' keyword)
+    std::map<std::string, type_safe::object_ref<const cppast::cpp_type>>
+        alias_template_index_;
+};
+
+}

src/uml/class_diagram/visitor/translation_unit_visitor.h

@@ -1,5 +1,5 @@
 /**
- * src/uml/class_diagram_visitor.h
+ * src/uml/class_diagram/visitor/translation_unit_visitor.h
  *
  * Copyright (c) 2021 Bartek Kryza <bkryza@gmail.com>
  *
@@ -20,6 +20,7 @@
 #include "config/config.h"
 #include "cx/cursor.h"
 #include "uml/class_diagram/model/diagram.h"
+#include "uml/class_diagram/visitor/translation_unit_context.h"
 
 #include <clang-c/CXCompilationDatabase.h>
 #include <clang-c/Index.h>
@@ -27,6 +28,7 @@
 #include <cppast/cpp_function_template.hpp>
 #include <cppast/cpp_member_function.hpp>
 #include <cppast/cpp_member_variable.hpp>
+#include <cppast/cpp_template.hpp>
 #include <cppast/cpp_template_parameter.hpp>
 #include <cppast/cpp_type.hpp>
 #include <cppast/visitor.hpp>
@@ -37,59 +39,13 @@
 #include <memory>
 #include <string>
 
-namespace clanguml {
-namespace visitor {
-namespace class_diagram {
+namespace clanguml::class_diagram::visitor {
 
-struct tu_context {
-    tu_context(cppast::cpp_entity_index &idx,
-        clanguml::class_diagram::model::diagram &d_,
-        const clanguml::config::class_diagram &config_);
-
-    bool has_type_alias(const std::string &full_name) const;
-
-    void add_type_alias(const std::string &full_name,
-        type_safe::object_ref<const cppast::cpp_type> &&ref);
-
-    type_safe::object_ref<const cppast::cpp_type> get_type_alias(
-        const std::string &full_name) const;
-
-    type_safe::object_ref<const cppast::cpp_type> get_type_alias_final(
-        const cppast::cpp_type &t) const;
-
-    bool has_type_alias_template(const std::string &full_name) const;
-
-    void add_type_alias_template(const std::string &full_name,
-        type_safe::object_ref<const cppast::cpp_type> &&ref);
-
-    type_safe::object_ref<const cppast::cpp_type> get_type_alias_template(
-        const std::string &full_name) const;
-
-    std::vector<std::string> namespace_;
-    cppast::cpp_entity_index &entity_index;
-    clanguml::class_diagram::model::diagram &d;
-    const clanguml::config::class_diagram &config;
-    std::map<std::string, type_safe::object_ref<const cppast::cpp_type>>
-        alias_index;
-    std::map<std::string, type_safe::object_ref<const cppast::cpp_type>>
-        alias_template_index;
-};
-
-template <typename T> struct element_visitor_context {
-    element_visitor_context(clanguml::class_diagram::model::diagram &d_, T &e);
-
-    tu_context *ctx;
-
-    T &element;
-    clanguml::class_diagram::model::class_ *parent_class{};
-    clanguml::class_diagram::model::diagram &d;
-};
-
-class tu_visitor {
+class translation_unit_visitor {
 public:
-    tu_visitor(cppast::cpp_entity_index &idx_,
-        clanguml::class_diagram::model::diagram &d_,
-        const clanguml::config::class_diagram &config_);
+    translation_unit_visitor(cppast::cpp_entity_index &idx,
+        clanguml::class_diagram::model::diagram &diagram,
+        const clanguml::config::class_diagram &config);
 
     void operator()(const cppast::cpp_entity &file);
 
@@ -168,10 +124,13 @@ private:
         const cppast::cpp_template_instantiation_type &t,
         std::optional<clanguml::class_diagram::model::class_ *> parent = {});
 
+    /**
+     * Try to resolve a type instance into a type referenced through an alias.
+     * If t does not represent an alias, returns t.
+     */
     const cppast::cpp_type &resolve_alias(const cppast::cpp_type &t);
 
-    tu_context ctx;
+    // ctx allows to track current visitor context, e.g. current namespace
+    translation_unit_context ctx;
 };
 }
-}
-}

tests/test_cases.h

@@ -24,7 +24,7 @@
 #include "puml/class_diagram_generator.h"
 #include "puml/sequence_diagram_generator.h"
 #include "uml/class_diagram/model/diagram.h"
-#include "uml/class_diagram_visitor.h"
+#include "uml/class_diagram/visitor/translation_unit_visitor.h"
 #include "uml/sequence_diagram_visitor.h"
 #include "util/util.h"