Move Upgrades and Prerequisites

OpenRA.Mods.Common/Traits/Player/ProvidesCustomPrerequisite.cs

@@ -0,0 +1,87 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Linq;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	public class ProvidesCustomPrerequisiteInfo : ITraitInfo
+	{
+		[Desc("The prerequisite type that this provides")]
+		public readonly string Prerequisite = null;
+
+		[Desc("Only grant this prerequisite when you have these prerequisites")]
+		public readonly string[] RequiresPrerequisites = { };
+
+		[Desc("Only grant this prerequisite for certain factions")]
+		public readonly string[] Race = { };
+
+		[Desc("Should it recheck everything when it is captured?")]
+		public readonly bool ResetOnOwnerChange = false;
+		public object Create(ActorInitializer init) { return new ProvidesCustomPrerequisite(init, this); }
+	}
+
+	public class ProvidesCustomPrerequisite : ITechTreePrerequisite, INotifyOwnerChanged
+	{
+		readonly ProvidesCustomPrerequisiteInfo info;
+
+		bool enabled = true;
+
+		public ProvidesCustomPrerequisite(ActorInitializer init, ProvidesCustomPrerequisiteInfo info)
+		{
+			this.info = info;
+
+			var race = init.Contains<RaceInit>() ? init.Get<RaceInit, string>() : init.self.Owner.Country.Race; 
+
+			Update(init.self.Owner, race);
+		}
+
+		public IEnumerable<string> ProvidesPrerequisites
+		{
+			get
+			{
+				if (!enabled)
+					yield break;
+
+				yield return info.Prerequisite;
+			}
+		}
+
+		public void OnOwnerChanged(Actor self, Player oldOwner, Player newOwner)
+		{
+			if (info.ResetOnOwnerChange)
+				Update(newOwner, newOwner.Country.Race);
+		}
+
+		void Update(Player owner, string race)
+		{
+			enabled = true;
+
+			if (info.Race.Any())
+				enabled = info.Race.Contains(race);
+
+			if (info.RequiresPrerequisites.Any() && enabled)
+				enabled = owner.PlayerActor.Trait<TechTree>().HasPrerequisites(info.RequiresPrerequisites);
+		}
+	}
+
+	// Allows maps / transformations to specify the race variant of an actor.
+	public class RaceInit : IActorInit<string>
+	{
+		[FieldFromYamlKey] public readonly string Race;
+
+		public RaceInit() { }
+		public RaceInit(string race) { Race = race; }
+		public string Value(World world) { return Race; }
+	}
+}