Rimworld generic backstory def loading

BackstoryDef.cs

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Xml;
using UnityEngine;
using Verse;

namespace RimWorld
{
	// Allows loading of backstories defined via <BackstoryDef> with optional <defName> (and optional <bodyTypeMale>/<bodyTypeFemale>)
	public class BackstoryDef : Def
	{
		private Backstory backstory;

		public void LoadDataFromXmlCustom(XmlNode xmlRoot)
		{
			XmlNode defNameNode = xmlRoot.SelectSingleNode("defName");
			if (defNameNode != null)
			{
				defName = defNameNode.InnerText;
				xmlRoot.RemoveChild(defNameNode); // need to remove, since Backstory doesn't have a defName field
			}
			backstory = DirectXmlToObject.ObjectFromXml<Backstory>(xmlRoot, doPostLoad: true);
			if (defName == Def.DefaultDefName && backstory != null)
			{
				// The defName needs to default to backstory.identifier, but that is only calculated in Backstory.ResolveReferences().
				// Furthermore, defName cannot be Def.DefaultDefName, or else DefDatabase.AddAllInMods() will coerce it with a warning before ResolveReferences() is called.
				// Copying the backstory.identifier calculation logic here, which doesn't depend on any references.
				int num = Mathf.Abs(GenText.StableStringHash(backstory.baseDesc) % 100);
				string s = backstory.title.Replace('-', ' ');
				s = GenText.CapitalizedNoSpaces(s);
				defName = GenText.RemoveNonAlphanumeric(s) + num.ToString();
			}
		}

		public override void ResolveReferences()
		{
			if (backstory != null)
			{
				if (backstory.slot == BackstorySlot.Adulthood && GetPrivateStringFieldValue(backstory, "bodyTypeGlobal").NullOrEmpty())
				{
					SetPrivateStringFieldValueIfNull(backstory, "bodyTypeMale", DefDatabase<BodyTypeDef>.GetNamedSilentFail("Male")?.defName ?? "Male");
					SetPrivateStringFieldValueIfNull(backstory, "bodyTypeFemale", DefDatabase<BodyTypeDef>.GetNamedSilentFail("Female")?.defName ?? "Female");
				}
				backstory.ResolveReferences();
				backstory.identifier = defName;
				BackstoryDatabase.AddBackstory(backstory); // like BackstoryDatabase.ReloadAllBackstories, add even if there are any config errors
				//Log.Message("Added custom backstory: " + defName);
			}
		}

		private static string GetPrivateStringFieldValue<T>(T obj, String fieldName)
		{
			return (string)typeof(T).GetField(fieldName, BindingFlags.Instance | BindingFlags.NonPublic).GetValue(obj);
		}

		private static void SetPrivateStringFieldValueIfNull<T>(T obj, String fieldName, object value)
		{
			FieldInfo field = typeof(T).GetField(fieldName, BindingFlags.Instance | BindingFlags.NonPublic);
			if (((string)field.GetValue(obj)).NullOrEmpty())
				field.SetValue(obj, value);
		}

		public override IEnumerable<string> ConfigErrors()
		{
			foreach (string error in base.ConfigErrors())
				yield return error;
			if (backstory != null)
				foreach (string error in backstory.ConfigErrors(ignoreNoSpawnCategories: false))
					yield return error;
		}
	}
}