First commit

.gitignore

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+# This .gitignore file should be placed at the root of your Unity project directory
+#
+# Get latest from https://github.com/github/gitignore/blob/master/Unity.gitignore
+#
+/[Ll]ibrary/
+/[Tt]emp/
+/[Oo]bj/
+/[Bb]uild/
+/[Bb]uilds/
+/[Ll]ogs/
+/[Uu]ser[Ss]ettings/
+
+# MemoryCaptures can get excessive in size.
+# They also could contain extremely sensitive data
+/[Mm]emoryCaptures/
+
+# Asset meta data should only be ignored when the corresponding asset is also ignored
+!/[Aa]ssets/**/*.meta
+
+# Uncomment this line if you wish to ignore the asset store tools plugin
+# /[Aa]ssets/AssetStoreTools*
+
+# Autogenerated Jetbrains Rider plugin
+/[Aa]ssets/Plugins/Editor/JetBrains*
+
+# Visual Studio cache directory
+.vs/
+
+# Gradle cache directory
+.gradle/
+
+# Autogenerated VS/MD/Consulo solution and project files
+ExportedObj/
+.consulo/
+*.csproj
+*.unityproj
+*.sln
+*.suo
+*.tmp
+*.user
+*.userprefs
+*.pidb
+*.booproj
+*.svd
+*.pdb
+*.mdb
+*.opendb
+*.VC.db
+
+# Unity3D generated meta files
+*.pidb.meta
+*.pdb.meta
+*.mdb.meta
+
+# Unity3D generated file on crash reports
+sysinfo.txt
+
+# Builds
+*.apk
+*.unitypackage
+
+# Crashlytics generated file
+crashlytics-build.properties
+
+# Packed Addressables
+/[Aa]ssets/[Aa]ddressable[Aa]ssets[Dd]ata/*/*.bin*
+
+# Temporary auto-generated Android Assets
+/[Aa]ssets/[Ss]treamingAssets/aa.meta
+/[Aa]ssets/[Ss]treamingAssets/aa/*

Assets/MackySoft/MackySoft.Modiferty/Scripts/IModifiablePropertyExtensions.cs

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+using System.Linq;
+
+namespace MackySoft.Modiferty {
+	public static class IModifiablePropertyExtensions {
+
+		public static bool Contains<T> (this IReadOnlyModifiableProperty<T> source,IModifier<T> modifier) {
+			return source.Modifiers.Contains(modifier);
+		}
+
+		/// <summary>
+		/// Shortcut of <see cref="IModifiableProperty{T}.Modifiers"/>.Add(modifier);
+		/// </summary>
+		public static void Add<T> (this IModifiableProperty<T> source,IModifier<T> modifier) {
+			source.Modifiers.Add(modifier);
+		}
+
+		/// <summary>
+		/// Shortcut of <see cref="IModifiableProperty{T}.Modifiers"/>.Remove(modifier);
+		/// </summary>
+		public static bool Remove<T> (this IModifiableProperty<T> source,IModifier<T> modifier) {
+			return source.Modifiers.Remove(modifier);
+		}
+
+		/// <summary>
+		/// Shortcut of <see cref="IModifiableProperty{T}.Modifiers"/>.Clear();
+		/// </summary>
+		public static void Clear<T> (this IModifiableProperty<T> source) {
+			source.Modifiers.Clear();
+		}
+
+	}
+
+}

Assets/MackySoft/MackySoft.Modiferty/Scripts/IModifier.cs

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+namespace MackySoft.Modiferty {
+
+	public interface IModifier<T> {
+
+		/// <summary>
+		/// <para> Priority of evaluation. </para>
+		/// <para> See: <see cref="ModifierList{T}.Evaluate(T)"/> </para>
+		/// </summary>
+		int Priority { get; }
+
+		/// <summary>
+		/// Evaluate the value.
+		/// </summary>
+		/// <param name="value"> Value to be modified. </param>
+		T Evaluate (T value);
+
+	}
+}

Assets/MackySoft/MackySoft.Modiferty/Scripts/MackySoft.Modiferty.asmdef

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+{
+    "name": "MackySoft.Modiferty",
+    "references": [],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Assets/MackySoft/MackySoft.Modiferty/Scripts/ModifieableProperty.cs

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+using System;
+using UnityEngine;
+
+namespace MackySoft.Modiferty {
+
+	public interface IReadOnlyModifiableProperty<T> {
+
+		/// <summary>
+		/// Base value before the evaluation.
+		/// </summary>
+		T BaseValue { get; }
+
+		/// <summary>
+		/// List of <see cref="IModifier{T}"/> to evaluate base value.
+		/// </summary>
+		IReadOnlyModifierList<T> Modifiers { get; }
+
+		/// <summary>
+		/// <para> Whether has modifiers. </para> 
+		/// <para> This is used to avoid creating unnecessary ModifierList. </para>
+		/// </summary>
+		bool HasModifiers { get; }
+
+		/// <summary>
+		/// Evaluate the base value by modifiers.
+		/// </summary>
+		T Evaluate ();
+
+	}
+
+	public interface IModifiableProperty<T> : IReadOnlyModifiableProperty<T> {
+
+		/// <summary>
+		/// Base value before the evaluation.
+		/// </summary>
+		new T BaseValue { get; set; }
+
+		/// <summary>
+		/// List of <see cref="IModifier{T}"/> to evaluate base value.
+		/// </summary>
+		new IModifierList<T> Modifiers { get; }
+
+	}
+
+	[Serializable]
+	public class ModifieableProperty<T> : IModifiableProperty<T> {
+
+		[SerializeField]
+		T m_BaseValue;
+
+		[NonSerialized]
+		ModifierList<T> m_Modifiers;
+
+		public T BaseValue {
+			get => m_BaseValue;
+			set => m_BaseValue = value;
+		}
+
+		public IModifierList<T> Modifiers => m_Modifiers ?? (m_Modifiers = new ModifierList<T>());
+
+		public bool HasModifiers => (m_Modifiers != null) && (m_Modifiers.Count > 0);
+
+		IReadOnlyModifierList<T> IReadOnlyModifiableProperty<T>.Modifiers => Modifiers;
+
+		public ModifieableProperty () : this(default) {
+		}
+
+		public ModifieableProperty (T baseValue) {
+			m_BaseValue = baseValue;
+		}
+
+		public T Evaluate () {
+			return (m_Modifiers != null) ? m_Modifiers.Evaluate(m_BaseValue) : m_BaseValue;
+		}
+
+	}
+
+}

Assets/MackySoft/MackySoft.Modiferty/Scripts/ModifierList.cs

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+using System;
+using System.Linq;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+
+namespace MackySoft.Modiferty {
+
+	public interface IReadOnlyModifierList<T> : IReadOnlyList<IModifier<T>> {
+
+		/// <summary>
+		/// Evaluate the value.
+		/// </summary>
+		/// <param name="value"> Value to be modified. </param>
+		T Evaluate (T value);
+
+	}
+
+	public interface IModifierList<T> : IList<IModifier<T>>, IReadOnlyModifierList<T> {
+		new int Count { get; }
+	}
+
+	[Serializable]
+	public class ModifierList<T> : Collection<IModifier<T>>, IModifierList<T> {
+
+		public T Evaluate (T value) {
+			if (Items.Count > 0) {
+				foreach (IModifier<T> modifier in Items.OrderByDescending(m => m.Priority)) {
+					value = modifier.Evaluate(value);
+				}
+			}
+			return value;
+		}
+
+	}
+
+}

Assets/MackySoft/MackySoft.Modiferty/Scripts/Modifiers/CreateModifier.cs

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+using System;
+
+namespace MackySoft.Modiferty {
+	public class CreateModifier<T> : IModifier<T> {
+
+		public Func<T,T> ModifyMethod { get; set; }
+		public int Priority { get; set; }
+
+		public CreateModifier (Func<T,T> modifyMethod) {
+			ModifyMethod = modifyMethod;
+		}
+
+		public T Evaluate (T value) {
+			return ModifyMethod.Invoke(value);
+		}
+
+	}
+
+}