Convention-Unity-Demo/Assets/Packages/TilemapGenerator2D/Scripts/Editor/SerializedPropertyExtension.cs

namespace DevelopersHub.ProceduralTilemapGenerator2D.Editor
{
    using System.Collections;
    using System.Linq;
    using System.Reflection;
    using System.Text.RegularExpressions;
    using UnityEditor;

    public static class SerializedPropertyExtension
    {
        
        private static readonly Regex rgx = new Regex(@"\[\d+\]", RegexOptions.Compiled);

        public static T GetValue<T>(this SerializedProperty property) where T : class
        {
            object obj = property.serializedObject.targetObject;
            string path = property.propertyPath.Replace(".Array.data", "");
            string[] fieldStructure = path.Split('.');
            for (int i = 0; i < fieldStructure.Length; i++)
            {
                if (fieldStructure[i].Contains("["))
                {
                    int index = System.Convert.ToInt32(new string(fieldStructure[i].Where(c => char.IsDigit(c)).ToArray()));
                    obj = GetFieldValueWithIndex(rgx.Replace(fieldStructure[i], ""), obj, index);
                }
                else
                {
                    obj = GetFieldValue(fieldStructure[i], obj);
                }
            }
            return (T)obj;
        }

        public static bool SetValue<T>(this SerializedProperty property, T value) where T : class
        {
            object obj = property.serializedObject.targetObject;
            string path = property.propertyPath.Replace(".Array.data", "");
            string[] fieldStructure = path.Split('.');
            for (int i = 0; i < fieldStructure.Length - 1; i++)
            {
                if (fieldStructure[i].Contains("["))
                {
                    int index = System.Convert.ToInt32(new string(fieldStructure[i].Where(c => char.IsDigit(c)).ToArray()));
                    obj = GetFieldValueWithIndex(rgx.Replace(fieldStructure[i], ""), obj, index);
                }
                else
                {
                    obj = GetFieldValue(fieldStructure[i], obj);
                }
            }
            string fieldName = fieldStructure.Last();
            if (fieldName.Contains("["))
            {
                int index = System.Convert.ToInt32(new string(fieldName.Where(c => char.IsDigit(c)).ToArray()));
                return SetFieldValueWithIndex(rgx.Replace(fieldName, ""), obj, index, value);
            }
            else
            {
                return SetFieldValue(fieldName, obj, value);
            }
        }

        private static object GetFieldValue(string fieldName, object obj, BindingFlags bindings = BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic)
        {
            FieldInfo field = obj.GetType().GetField(fieldName, bindings);
            if (field != null)
            {
                return field.GetValue(obj);
            }
            return default(object);
        }

        private static object GetFieldValueWithIndex(string fieldName, object obj, int index, BindingFlags bindings = BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic)
        {
            FieldInfo field = obj.GetType().GetField(fieldName, bindings);
            if (field != null)
            {
                object list = field.GetValue(obj);
                if (list.GetType().IsArray)
                {
                    return ((object[])list)[index];
                }
                else if (list is IEnumerable)
                {
                    return ((IList)list)[index];
                }
            }
            return default(object);
        }

        public static bool SetFieldValue(string fieldName, object obj, object value, bool includeAllBases = false, BindingFlags bindings = BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic)
        {
            FieldInfo field = obj.GetType().GetField(fieldName, bindings);
            if (field != null)
            {
                field.SetValue(obj, value);
                return true;
            }
            return false;
        }

        public static bool SetFieldValueWithIndex(string fieldName, object obj, int index, object value, bool includeAllBases = false, BindingFlags bindings = BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic)
        {
            FieldInfo field = obj.GetType().GetField(fieldName, bindings);
            if (field != null)
            {
                object list = field.GetValue(obj);
                if (list.GetType().IsArray)
                {
                    ((object[])list)[index] = value;
                    return true;
                }
                else if (list is IEnumerable)
                {
                    ((IList)list)[index] = value;
                    return true;
                }
            }
            return false;
        }
        
    }
}