[add] Added ContextBuilderInterface and Replaced Context from struct to class.

sjplayer/src/sjplayer/Context.d

@@ -2,23 +2,23 @@
 module sjplayer.Context;
 
 import std.algorithm,
+       std.array,
        std.typecons;
 
 import sjscript;
 
-import sjplayer.ElementInterface,
+import sjplayer.ContextBuilderInterface,
+       sjplayer.ElementInterface,
        sjplayer.ProgramSet,
        sjplayer.ScheduledControllerInterface,
        sjplayer.VarStoreInterface;
 
 ///
-struct Context {
+class Context {
  public:
-  @disable this();
-  @disable this(this);
-
   ///
   this(ParametersBlock[] params, ProgramSet programs) {
+    auto builder  = new Builder;
     auto varstore = new BlackHole!VarStoreInterface;
 
     import sjplayer.CircleElementScheduledController;
@@ -29,12 +29,13 @@ struct Context {
         ),
       );
     foreach (factory; factories) {
-      auto result = factory[1].
-        Create(params.filter!(x => x.name == factory[0]));
-      elements_    ~= result.elements;
-      drawers_     ~= result.drawer;
-      controllers_ ~= result.controllers;
+      factory[1].
+        Create(params.filter!(x => x.name == factory[0]), builder);
     }
+
+    elements_    = builder.elements[];
+    drawers_     = builder.drawers[];
+    controllers_ = builder.controllers[];
   }
   ///
   ~this() {
@@ -47,7 +48,6 @@ struct Context {
   ElementInterface.DamageCalculationResult CalculateDamage() const {
     assert(false);  // TODO:
   }
-
   ///
   void DrawElements() {
     drawers_.each!(x => x.Draw());
@@ -58,6 +58,22 @@ struct Context {
   }
 
  private:
+  class Builder : ContextBuilderInterface {
+   public:
+    override void AddElement(ElementInterface element) {
+      elements ~= element;
+    }
+    override void AddElementDrawer(ElementDrawerInterface drawer) {
+      drawers ~= drawer;
+    }
+    override void AddScheduledController(ScheduledControllerInterface controller) {
+      controllers ~= controller;
+    }
+    Appender!(ElementInterface[])             elements;
+    Appender!(ElementDrawerInterface[])       drawers;
+    Appender!(ScheduledControllerInterface[]) controllers;
+  }
+
   ElementInterface[] elements_;
 
   ElementDrawerInterface[] drawers_;

sjplayer/src/sjplayer/ContextBuilderInterface.d

@@ -0,0 +1,16 @@
+/// License: MIT
+module sjplayer.ContextBuilderInterface;
+
+import sjplayer.ElementInterface,
+       sjplayer.ScheduledControllerInterface;
+
+///
+interface ContextBuilderInterface {
+ public:
+  ///
+  void AddElement(ElementInterface element);
+  ///
+  void AddElementDrawer(ElementDrawerInterface drawer);
+  ///
+  void AddScheduledController(ScheduledControllerInterface controller);
+}

sjplayer/src/sjplayer/ScheduledControllerFactory.d

@@ -10,23 +10,13 @@ import std.algorithm,
 
 import sjscript;
 
-import sjplayer.ElementInterface,
+import sjplayer.ContextBuilderInterface,
+       sjplayer.ElementInterface,
        sjplayer.ProgramSet,
        sjplayer.ScheduledControllerInterface,
        sjplayer.VarStoreInterface,
        sjplayer.util.Period;
 
-///
-struct ScheduledControllerCreationResult {
-  ///
-  ElementInterface[] elements;
-  ///
-  ScheduledControllerInterface[] controllers;
-
-  ///
-  ElementDrawerInterface drawer;
-}
-
 ///
 struct ElementScheduledControllerFactory(ScheduledController, ElementDrawer)
   if (is(ScheduledController : ScheduledControllerInterface) &&
@@ -54,22 +44,19 @@ struct ElementScheduledControllerFactory(ScheduledController, ElementDrawer)
   }
 
   ///
-  ScheduledControllerCreationResult Create(R)(R params)
+  void Create(R)(R params, ContextBuilderInterface builder)
       if (isInputRange!R && is(ElementType!R == ParametersBlock)) {
     auto parallelized = params.ParallelizeParams();
-
     auto elements     = appender!(Element[]);
-    auto controllers = appender!(ScheduledController[]);
 
     foreach (ref serial; parallelized) {
       auto element = new Element;
       elements    ~= element;
-      controllers ~= new ScheduledController(element, varstore_, serial);
+      builder.AddElement(element);
+      builder.AddScheduledController(
+          new ScheduledController(element, varstore_, serial));
     }
-    return ScheduledControllerCreationResult(
-        elements[]   .map!(x => cast(ElementInterface)             x).array,
-        controllers[].map!(x => cast(ScheduledControllerInterface) x).array,
-        new ElementDrawer(program_, elements[]));
+    builder.AddElementDrawer(new ElementDrawer(program_, elements[]));
   }
 
  private:

sjplayer/src/sjplayer/package.d

@@ -15,5 +15,5 @@ Context CreateContextFromText(string src, ProgramSet programs) {
 ///
 Context CreateContextFromScriptAst(
     ParametersBlock[] params, ProgramSet programs) {
-  return Context(params, programs);
+  return new Context(params, programs);
 }

sjplayer/standalone/main.d

@@ -26,6 +26,7 @@ int main(string[] args) {
   scope(exit) programs.destroy();
 
   auto context = script_file.readText.CreateContextFromText(programs);
+  scope(exit) context.destroy();
 
   while (true) {
     sfEvent e;