Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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

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+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Frozen;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	public class ProvidesPrerequisiteInfo : ConditionalTraitInfo, ITechTreePrerequisiteInfo
+	{
+		[Desc("The prerequisite type that this provides. If left empty it defaults to the actor's name.")]
+		public readonly string Prerequisite = null;
+
+		[Desc("Only grant this prerequisite when you have these prerequisites.")]
+		public readonly ImmutableArray<string> RequiresPrerequisites = [];
+
+		[Desc("Only grant this prerequisite for certain factions.")]
+		public readonly FrozenSet<string> Factions = FrozenSet<string>.Empty;
+
+		[Desc("Should it recheck everything when it is captured?")]
+		public readonly bool ResetOnOwnerChange = false;
+
+		IEnumerable<string> ITechTreePrerequisiteInfo.Prerequisites(ActorInfo info)
+		{
+			return [Prerequisite ?? info.Name];
+		}
+
+		public override object Create(ActorInitializer init) { return new ProvidesPrerequisite(init, this); }
+	}
+
+	public class ProvidesPrerequisite : ConditionalTrait<ProvidesPrerequisiteInfo>, ITechTreePrerequisite, INotifyOwnerChanged, INotifyCreated
+	{
+		readonly string[] prerequisites;
+
+		bool enabled;
+		TechTree techTree;
+		string faction;
+
+		public ProvidesPrerequisite(ActorInitializer init, ProvidesPrerequisiteInfo info)
+			: base(info)
+		{
+			if (string.IsNullOrEmpty(info.Prerequisite))
+				prerequisites = [init.Self.Info.Name];
+			else
+				prerequisites = [info.Prerequisite];
+
+			faction = init.GetValue<FactionInit, string>(init.Self.Owner.Faction.InternalName);
+		}
+
+		public IEnumerable<string> ProvidesPrerequisites => enabled ? prerequisites : Enumerable.Empty<string>();
+
+		protected override void Created(Actor self)
+		{
+			techTree = self.Owner.PlayerActor.Trait<TechTree>();
+
+			Update();
+
+			base.Created(self);
+		}
+
+		public void OnOwnerChanged(Actor self, Player oldOwner, Player newOwner)
+		{
+			techTree = newOwner.PlayerActor.Trait<TechTree>();
+
+			if (Info.ResetOnOwnerChange)
+				faction = newOwner.Faction.InternalName;
+
+			Update();
+		}
+
+		void Update()
+		{
+			enabled = !IsTraitDisabled;
+			if (IsTraitDisabled)
+				return;
+
+			if (Info.Factions.Count > 0)
+				enabled = Info.Factions.Contains(faction);
+
+			if (Info.RequiresPrerequisites.Length > 0 && enabled)
+				enabled = techTree.HasPrerequisites(Info.RequiresPrerequisites);
+		}
+
+		protected override void TraitEnabled(Actor self)
+		{
+			Update();
+			techTree.ActorChanged(self);
+		}
+
+		protected override void TraitDisabled(Actor self)
+		{
+			Update();
+			techTree.ActorChanged(self);
+		}
+	}
+}