module-inspector/Runtime/Utilities/ReflectionUtility.cs

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

namespace Module.Inspector.Utilities
{
    internal static class ReflectionUtility
    {
        #if UNITY_EDITOR
        public static T GetValue<T>(object obj, string name)
        {
            return GetValue<T>(obj, name, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
        }

        public static T GetValue<T>(object obj, string name, BindingFlags flags)
        {
            FieldInfo field = obj.GetType().GetField(name, flags);
            return field != null ? (T)field.GetValue(obj) : default;
        }

        public static T GetValue<T>(object obj, FieldInfo field)
        {
            return field != null ? (T)field.GetValue(obj) : default;
        }

        public static T[] GetArrayValue<T>(object obj, string name)
        {
            return GetArrayValue<T>(obj, name, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
        }

        public static T[] GetArrayValue<T>(object obj, string name, BindingFlags flags)
        {
            FieldInfo field = obj.GetType().GetField(name, flags);
            return field != null ? (T[])field.GetValue(obj) : default;
        }

        public static void SetValue<T>(object obj, string name, T value)
        {
            SetValue(obj, name, value, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
        }

        public static void SetValue<T>(object obj, string name, T value, BindingFlags flags)
        {
            FieldInfo field = obj.GetType().GetField(name, flags);

            if (field != null)
                field.SetValue(obj, value);
        }

        public static void SetValue<T>(object obj, T value, FieldInfo field)
        {
            field.SetValue(obj, value);
        }

        public static void SetValue<T>(object obj, string name, T[] value)
        {
            SetValue(obj, name, value, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
        }

        public static void SetValue<T>(object obj, string name, T[] value, BindingFlags flags)
        {
            FieldInfo field = obj.GetType().GetField(name, flags);

            if (field != null)
                field.SetValue(obj, value);
        }

        public static FieldInfo[] GetFields<T>(BindingFlags flags)
        {
            return typeof(T).GetFields(flags);
        }

        public static FieldInfo[] GetFields(Type type, BindingFlags flags)
        {
            return type.GetFields(flags);
        }

        public static FieldInfo[] GetFields(Type type, BindingFlags flags, string[] ignoreFields)
        {
            var fields = new List<FieldInfo>(GetFields(type, flags));

            for (int i = fields.Count - 1; i >= 0; i--)
            {
                FieldInfo fi = fields[i];

                for (var j = 0; j < ignoreFields.Length; j++)
                {
                    if (!fi.Name.Equals(ignoreFields[j]))
                        continue;

                    fields.RemoveAt(i);
                    break;
                }
            }

            return fields.ToArray();
        }

        public static bool HasField<T>(object obj, string name)
        {
            return HasField<T>(obj, name, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
        }

        public static bool HasField<T>(object obj, string name, BindingFlags flags)
        {
            FieldInfo field = obj.GetType().GetField(name, flags);
            return field != null && field.FieldType.IsAssignableFrom(typeof(T));
        }

        public static T GetPropertyValue<T>(object obj, string name)
        {
            return GetPropertyValue<T>(obj, name, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
        }

        public static T GetPropertyValue<T>(object obj, string name, BindingFlags flags)
        {
            PropertyInfo pi = obj.GetType().GetProperty(name, flags);
            return pi != null ? (T)pi.GetValue(obj, null) : default(T);
        }

        public static void SetPropertyValue<T>(object obj, string name, T value)
        {
            SetPropertyValue<T>(obj, name, value, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
        }

        public static void SetPropertyValue<T>(object obj, string name, T value, BindingFlags flags)
        {
            PropertyInfo pi = obj.GetType().GetProperty(name, flags);

            if (pi != null)
                pi.SetValue(obj, value, null);
        }

        public static bool HasAttribute(FieldInfo field, System.Type attributeType)
        {
            // WSU: Needs the explicit conversion
            var objs = (object[])field.GetCustomAttributes(attributeType, true);
            return objs.Length != 0;
        }

        public static bool HasAttributeTitle(FieldInfo field)
        {
            return HasAttribute(field, typeof(HeaderAttribute));
        }

        public static T GetAttribute<T>(FieldInfo field)
        {
            // WSU: Needs the explicit conversion
            var objs = (object[])field.GetCustomAttributes(typeof(T), true);

            if (objs.Length != 0)
                return (T)objs[0];

            return default;
        }

        public static string GetAttributeTitle(FieldInfo field)
        {
            // WSU: Needs the explicit conversion
            var objs = (object[])field.GetCustomAttributes(typeof(HeaderAttribute), true);

            if (objs.Length == 0)
                return "Unknown";

            Type type = objs[0].GetType();
            return (string)type.GetFields()[0].GetValue(objs[0]);
        }

        public static Type[] GetTypesWith(System.Type type)
        {
            Type[] types = type.Assembly.GetTypes();
            var arr = new List<Type>();

            for (var i = 0; i < types.Length; i++)
            {
                Type t = types[i];

                if (t == type || type.IsAssignableFrom(t))
                    arr.Add(t);
            }

            return arr.ToArray();
        }

        public static Type GetAnyTypeWithName(string typeName)
        {
            Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();

            for (var i = 0; i < assemblies.Length; i++)
            {
                Type type = assemblies[i].GetType(typeName);

                if (type != null)
                    return type;
            }

            return null;
        }

        public static object Create(Type type)
        {
            return Activator.CreateInstance(type);
        }

        public static void CopyFields(object source, object destination)
        {
            // Get fields
            FieldInfo[] sourceFields = GetFields(source.GetType(), BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
            FieldInfo[] destinationFields = GetFields(destination.GetType(), BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);

            // Start setting fields (if of same type)
            for (var i = 0; i < sourceFields.Length; i++)
            {
                FieldInfo fiSource = sourceFields[i];

                for (var j = 0; j < destinationFields.Length; j++)
                {
                    FieldInfo fiDestination = destinationFields[j];

                    if (fiSource.Name.Equals(fiDestination.Name) && fiSource.FieldType == fiDestination.FieldType)
                    {
                        fiDestination.SetValue(destination, fiSource.GetValue(source));
                        break;
                    }
                }
            }
        }
        #endif
    }
}