Created 2/3rd of ECS (EC has been added) and World for ECS

sourceCode/ECS.hpp

@@ -0,0 +1,147 @@
+/*
+ * SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#ifndef GUARD_TOURMALINE_ECS_H
+#define GUARD_TOURMALINE_ECS_H
+#include <any>
+#include <concepts>
+#include <format>
+#include <typeindex>
+#include <unordered_map>
+#include <utility>
+
+#include "Systems/Logging.hpp"
+#include "Types.hpp"
+
+namespace Tourmaline::ECS {
+using Entity = Tourmaline::Type::UUID;
+class World;
+
+struct BaseComponent {
+public:
+  virtual ~BaseComponent() = default;
+  const Entity &GetOwner();
+
+private:
+  const Entity *owner;
+  friend World;
+};
+
+// Concepts
+template <typename T>
+concept Component = std::derived_from<T, BaseComponent>;
+
+class World {
+public:
+  // Entity
+  Entity CreateEntity();
+  bool EntityExists(const Entity &entity) noexcept;
+  [[nodiscard(
+      "It is not guranteed that an entity can always be destroyed, please make "
+      "sure by checking the returned bool")]]
+  bool DestroyEntity(Entity entity);
+
+  // Components
+  template <Component T, typename... Args>
+  T &AddComponent(const Entity &entity, Args &&...constructionArguments) {
+    // Insert to entity list
+    auto entityIter = GetEntityIterator(
+        entity,
+        std::format(
+            "Cannot add component \"{}\"! Entity \"{}\" does not exist!",
+            typeid(T).name(), entity.asString()),
+        "AddComponent", Systems::Logging::LogLevel::Error);
+
+    auto [componentIter, success] = entityIter->second.try_emplace(
+        typeid(T), T(std::forward<Args>(constructionArguments)...));
+    Systems::Logging::Log(
+        std::format("Cannot add component! Component \"{}\" already exists "
+                    "in entity \"{}\" ",
+                    typeid(T).name(), entity.asString()),
+        "AddComponent", Systems::Logging::LogLevel::Error, !success);
+
+    T &component = std::any_cast<T &>(componentIter->second);
+    component.owner = &entity;
+    return component;
+  }
+
+  template <Component T>
+  [[nodiscard("Discarding an expensive operation's result!")]]
+  T &GetComponent(const Entity &entity) {
+    auto iter = GetEntityIterator(
+        entity,
+        std::format("Can't get entity \"{}\"'s component \"{}\", since "
+                    "entity does not exist!",
+                    entity.asString(), typeid(T).name()),
+        "GetComponent", Systems::Logging::LogLevel::Error);
+
+    auto component = iter->second.find(typeid(T));
+    Systems::Logging::Log(
+        std::format(
+            "Entity \"{}\" does not have component \"{}\", cannot get it!",
+            entity.asString(), typeid(T).name()),
+        "GetComponent", Systems::Logging::LogLevel::Error,
+        component == iter->second.end());
+
+    return std::any_cast<T &>(component->second);
+  }
+
+  template <Component T>
+  [[nodiscard("Discarding an expensive operation's result!")]]
+  bool HasComponent(const Entity &entity) {
+    auto iter = GetEntityIterator(
+        entity,
+        std::format("Can't find if entity \"{}\" has component \"{}\", since "
+                    "entity does not exist!",
+                    entity.asString(), typeid(T).name()));
+
+    return iter != entityComponentList.end() &&
+           (iter->second.find(typeid(T)) != iter->second.end());
+  }
+
+  template <Component T>
+  [[nodiscard(
+      "It is not guranteed that a component can always be removed, please make "
+      "sure by checking the returned bool")]]
+  bool RemoveComponent(const Entity &entity) {
+    auto entityIter = GetEntityIterator(
+        entity,
+        std::format("Cannot remove component {} from entity {}, since entity "
+                    "does not exist!",
+                    typeid(T).name(), entity.asString()),
+        "RemoveComponent", Systems::Logging::LogLevel::Warning);
+    if (entityIter == entityComponentList.end()) {
+      return false;
+    }
+
+    auto componentIter = entityIter->second.find(typeid(T));
+    if (componentIter == entityIter->second.end()) {
+      Systems::Logging::Log(
+          std::format("Cannot remove component {} from entity {}, since entity "
+                      "does not have that component",
+                      typeid(T).name(), entity.asString()),
+          "RemoveComponent", Systems::Logging::LogLevel::Warning);
+      return false;
+    }
+
+    entityIter->second.erase(componentIter);
+    return true;
+  }
+
+private:
+  std::unordered_map<Entity, std::unordered_map<std::type_index, std::any>>
+      entityComponentList{};
+
+  decltype(entityComponentList)::iterator
+  GetEntityIterator(const Entity &entity, const std::string &errorMessage = "",
+                    const std::string &position = "",
+                    Tourmaline::Systems::Logging::LogLevel severity =
+                        Systems::Logging::LogLevel::Warning);
+};
+} // namespace Tourmaline::ECS
+#endif

sourceCode/ECS/Component.cpp

@@ -0,0 +1,14 @@
+/*
+ * SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "../ECS.hpp"
+
+using namespace Tourmaline::ECS;
+
+const Entity &BaseComponent::GetOwner() { return *this->owner; }

sourceCode/ECS/World.cpp

@@ -0,0 +1,55 @@
+/*
+ * SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "../ECS.hpp"
+#include "../Systems/Random.hpp"
+
+using namespace Tourmaline::ECS;
+
+Entity World::CreateEntity() {
+  auto [iterator, success] =
+      entityComponentList.try_emplace(Systems::Random::GenerateUUID());
+
+  Systems::Logging::Log("Failed to create an entity! Possibly by incredible "
+                        "luck generated already existing UUID?",
+                        "CreateEntity", Systems::Logging::LogLevel::Critical,
+                        !success);
+  return iterator->first;
+}
+
+bool World::EntityExists(const Entity &entity) noexcept {
+  return entityComponentList.find(entity) != entityComponentList.end();
+}
+
+bool World::DestroyEntity(Entity entity) {
+  auto entityIter = GetEntityIterator(
+      entity,
+      std::format("Cannot delete entity \"{}\", it does not exist!",
+                  entity.asString()),
+      "DestroyEntity");
+
+  if (entityIter == entityComponentList.end()) {
+    return false;
+  }
+
+  entityComponentList.erase(entityIter);
+  return true;
+}
+
+// Very repetitive code
+decltype(World::entityComponentList)::iterator
+World::GetEntityIterator(const Entity &entity, const std::string &errorMessage,
+                         const std::string &position,
+                         Tourmaline::Systems::Logging::LogLevel severity) {
+  auto iter = entityComponentList.find(entity);
+
+  Systems::Logging::Log(errorMessage, "GetEntityIterator/" + position, severity,
+                        iter == entityComponentList.end());
+  return iter;
+}

sourceCode/Systems/Implementation/Logging.cpp

@@ -22,8 +22,8 @@ using namespace Tourmaline::Systems;
 
 // This is what happens when it takes you 50 years to implement
 // reflections to a language
-std::array<const std::string, 5> Logging::LogLevelToString{
-    "Critical", "Error", "Info", "Debug", "Trace"};
+std::array<const std::string, 6> Logging::LogLevelToString{
+    "Critical", "Error", "Warning", "Info", "Debug", "Trace"};
 std::fstream Logging::File;
 
 void Logging::LogToFile(std::string File) {
@@ -53,7 +53,8 @@ void Logging::Log(const std::string &message, const std::string &position,
       Logging::File.flush(); // Terrible but necessary sadly
     }
 
-    if (severity == Logging::LogLevel::Critical) {
+    // Error and Critical
+    if (severity < Logging::LogLevel::Warning) {
       throw std::runtime_error(output);
     }
   }

sourceCode/Systems/Logging.hpp

@@ -17,9 +17,10 @@ public:
   enum class LogLevel {
     Critical = 0,
     Error = 1,
-    Info = 2,
-    Debug = 3,
-    Trace = 4
+    Warning = 2,
+    Info = 3,
+    Debug = 4,
+    Trace = 5
   };
 
   static void LogToFile(std::string File = "");
@@ -29,6 +30,6 @@ public:
 
 private:
   static std::fstream File;
-  static std::array<const std::string, 5> LogLevelToString;
+  static std::array<const std::string, 6> LogLevelToString;
 };
 } // namespace Tourmaline::Systems

sourceCode/Types.hpp

@@ -9,15 +9,18 @@
 #ifndef GUARD_TOURMALINE_TYPES_H
 #define GUARD_TOURMALINE_TYPES_H
 #include <cstdint>
+#include <functional>
 #include <memory>
 namespace Tourmaline::Type {
-struct UUID {
+class UUID {
+public:
   constexpr static uint8_t BitLength = 128;
   constexpr static uint8_t QWORDLength = BitLength / 64;
   constexpr static uint8_t ByteLength = BitLength / 8;
 
   [[nodiscard]]
   std::string asString() const;
+  bool operator==(const UUID &rhs) const;
 
   UUID(uint64_t firstHalf, uint64_t secondHalf);
   UUID(const std::string &uuid);
@@ -30,6 +33,22 @@ struct UUID {
 
 private:
   std::unique_ptr<uint64_t[]> data = std::make_unique<uint64_t[]>(QWORDLength);
+  friend struct std::hash<Tourmaline::Type::UUID>;
 };
 } // namespace Tourmaline::Type
+
+namespace std {
+template <> struct hash<Tourmaline::Type::UUID> {
+  size_t operator()(const Tourmaline::Type::UUID &uuid) const noexcept {
+    const auto data = uuid.data.get();
+    size_t h1 = std::hash<uint64_t>{}(data[0]);
+    size_t h2 = std::hash<uint64_t>{}(data[1]);
+
+    // Combine the two hashes
+    return h1 ^ (h2 << 1);
+  }
+};
+
+} // namespace std
+
 #endif

sourceCode/Types/UUID.cpp

@@ -20,6 +20,16 @@ std::string UUID::asString() const {
   return std::format("{:016X}{:016X}", data[0], data[1]);
 }
 
+bool UUID::operator==(const UUID &rhs) const {
+  // Since size may be increased
+  for (uint8_t index = 0; index < QWORDLength; index++) {
+    if (this->data[index] != rhs.data[index]) {
+      return false;
+    }
+  }
+  return true;
+}
+
 UUID::UUID(const UUID &uuid) {
   std::memcpy(data.get(), uuid.data.get(), UUID::ByteLength);
 }