Units gain exp for kills and level up

OpenRA.Mods.RA/GivesExperience.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it 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.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using OpenRA.Traits;
+using System.Linq;
+
+namespace OpenRA.Mods.RA
+{
+	class GivesExperienceInfo : TraitInfo<GivesExperience> { public readonly int Experience = -1;	}
+
+	class GivesExperience : INotifyDamage
+	{
+		public void Damaged(Actor self, AttackInfo e)
+		{
+			if (e.DamageState == DamageState.Dead)
+			{	
+				// Prevent TK from giving exp
+				//if (self.Owner == e.Attacker.Owner)
+				//	return;
+				
+				var exp = 0;
+				if (self.Info.Traits.Get<ValuedInfo>() != null)
+					exp = self.Info.Traits.Get<ValuedInfo>().Cost;
+				if (self.Info.Traits.Get<GivesExperienceInfo>().Experience >= 0)
+					exp = self.Info.Traits.Get<GivesExperienceInfo>().Experience;
+
+				var killer = e.Attacker.traits.WithInterface<GainsExperience>().FirstOrDefault();
+				if (killer != null)
+					killer.GiveExperience(exp);
+			}
+		}
+	}
+}