beginning query syntax system

encompass-cs/Engine.cs

@@ -561,7 +561,7 @@ namespace Encompass
         /// <param name="easeInTime">The time that will elapse before time is fully dilated, in real time.</param>
         /// <param name="activeTime">The length of real time that time will be fully dilated.</param>
         /// <param name="easeOutTime">The time that will elapse before time is fully undilated.</param>
-        public void ActivateTimeDilation(double factor, double easeInTime, double activeTime, double easeOutTime)
+        protected void ActivateTimeDilation(double factor, double easeInTime, double activeTime, double easeOutTime)
         {
             timeManager.ActivateTimeDilation(factor, easeInTime, activeTime, easeOutTime);
         }
@@ -576,7 +576,7 @@ namespace Encompass
         /// <param name="easeInFunction">An easing function for the easing in of time dilation.</param>
         /// <param name="activeTime">The length of real time that time will be fully dilated.</param>
         /// <param name="easeOutTime">The time that will elapse before time is fully undilated.</param>
-        public void ActivateTimeDilation(double factor, double easeInTime, System.Func<double, double, double, double, double> easeInFunction, double activeTime, double easeOutTime)
+        protected void ActivateTimeDilation(double factor, double easeInTime, System.Func<double, double, double, double, double> easeInFunction, double activeTime, double easeOutTime)
         {
             timeManager.ActivateTimeDilation(factor, easeInTime, easeInFunction, activeTime, easeOutTime);
         }
@@ -591,7 +591,7 @@ namespace Encompass
         /// <param name="activeTime">The length of real time that time will be fully dilated.</param>
         /// <param name="easeOutTime">The time that will elapse before time is fully undilated.</param>
         /// <param name="easeOutFunction">An easing function for the easing out of time dilation.</param>
-        public void ActivateTimeDilation(double factor, double easeInTime, double activeTime, double easeOutTime, System.Func<double, double, double, double, double> easeOutFunction)
+        protected void ActivateTimeDilation(double factor, double easeInTime, double activeTime, double easeOutTime, System.Func<double, double, double, double, double> easeOutFunction)
         {
             timeManager.ActivateTimeDilation(factor, easeInTime, activeTime, easeOutTime, easeOutFunction);
         }
@@ -607,14 +607,14 @@ namespace Encompass
         /// <param name="activeTime">The length of real time that time will be fully dilated.</param>
         /// <param name="easeOutTime">The time that will elapse before time is fully undilated.</param>
         /// <param name="easeOutFunction">An easing function for the easing out of time dilation.</param>
-        public void ActivateTimeDilation(double factor, double easeInTime, System.Func<double, double, double, double, double> easeInFunction, double activeTime, double easeOutTime, System.Func<double, double, double, double, double> easeOutFunction)
+        protected void ActivateTimeDilation(double factor, double easeInTime, System.Func<double, double, double, double, double> easeInFunction, double activeTime, double easeOutTime, System.Func<double, double, double, double, double> easeOutFunction)
         {
             timeManager.ActivateTimeDilation(factor, easeInTime, easeInFunction, activeTime, easeOutTime, easeOutFunction);
         }
 
-        public IEnumerable<Entity> EntitiesWithComponents(IEnumerable<Type> types)
+        protected EntitySetQuery QueryEntities()
         {
-            return componentManager.EntitiesWithComponents(types);
+            return new EntitySetQuery(componentManager);
         }
     }
 }

encompass-cs/EntitySetQuery.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+
+namespace Encompass
+{
+    public struct EntitySetQuery : IEnumerable<Entity>
+    {
+        private EntitySetQuery(ComponentManager componentManager, ImmutableArray<Type> includes, ImmutableArray<Type> excludes)
+        {
+            ComponentManager = componentManager;
+            Includes = includes;
+            Excludes = excludes;
+        }
+
+        internal EntitySetQuery(ComponentManager componentManager)
+        {
+            ComponentManager = componentManager;
+            Includes = ImmutableArray.Create<Type>();
+            Excludes = ImmutableArray.Create<Type>();
+        }
+
+        private ComponentManager ComponentManager { get; }
+        private ImmutableArray<Type> Includes { get; }
+        private ImmutableArray<Type> Excludes { get; }
+
+        public EntitySetQuery With<TComponent>() where TComponent : struct, IComponent
+        {
+            return new EntitySetQuery(ComponentManager, Includes.Add(typeof(TComponent)), Excludes);
+        }
+
+        public EntitySetQuery Without<TComponent>() where TComponent : struct, IComponent
+        {
+            return new EntitySetQuery(ComponentManager, Includes, Excludes.Add(typeof(TComponent)));
+        }
+
+        public IEnumerator<Entity> GetEnumerator()
+        {
+            return ComponentManager.EntitiesWithComponents(Includes).GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+    }
+}

encompass-cs/encompass-cs.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <RootNamespace>Encompass</RootNamespace>
@@ -24,5 +24,6 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="MoonTools.Core.Graph" Version="1.0.0"/>
+    <PackageReference Include="System.Collections.Immutable" Version="1.7.0"/>
   </ItemGroup>
 </Project>

test/EngineTest.cs

@@ -1096,7 +1096,7 @@ namespace Tests
         {
             public override void Update(double dt)
             {
-                queriedEntities = EntitiesWithComponents(new Type[] { typeof(MockComponent), typeof(MockComponentB) }).ToArray();
+                queriedEntities = QueryEntities().With<MockComponent>().With<MockComponentB>().ToArray();
             }
         }