取得有效的 BuildTargetGroup 替代名稱

BuildTargetGroupExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;
using UnityEditor;

public sealed class EnumTest
{
    [Test]
    [TestCase("iOS", true, "iOS")] // iOS 有效
    [TestCase("iPhone", true, "iOS")] // iPhone 已棄用但有替代名稱 iOS
    [TestCase("PS3", false, null)] // PS3 已棄用且沒替代名稱
    public void TestTryGetAvailableName(string name, bool available, string altName)
    {
        var enumValue = Enum.Parse<BuildTargetGroup>(name);
        Assert.AreEqual(available, enumValue.TryGetAvailableName(out var availableName));
        Assert.AreEqual(altName, availableName);
    }
}

public static class BuildTargetGroupExtensions
{
    static readonly Dictionary<string, (bool deprecated, BuildTargetGroup value)> s_name2Available;

    static BuildTargetGroupExtensions()
    {
        var buildTargetGroupType = typeof(BuildTargetGroup);
        var obsoleteAttributeType = typeof(ObsoleteAttribute);
        s_name2Available = Enum.GetNames(buildTargetGroupType)
            .ToDictionary(name => name, name =>
            {
                var deprecated = Attribute.IsDefined(buildTargetGroupType.GetField(name), obsoleteAttributeType);
                var value = Enum.Parse<BuildTargetGroup>(name);
                return (deprecated, value);
            });
    }

    /// <summary>
    /// 嘗試取得有效的替代名稱 (排除已由 <see cref="ObsoleteAttribute" /> 標註為棄用的部分)
    /// </summary>
    /// <param name="name">有效的替代名稱, 如果沒有傳回 null</param>
    /// <returns>傳入的 <paramref name="buildTarget"/> 如果有任何有效的名稱或替代名稱</returns>
    public static bool TryGetAvailableName(this BuildTargetGroup buildTarget, out string name)
    {
        name = buildTarget.ToString();
        if (!s_name2Available.TryGetValue(name, out var meta))
        {
            name = null;
            return false;
        }

        var alt = s_name2Available.FirstOrDefault(p => p.Value.value == buildTarget && !p.Value.deprecated);
        if (string.IsNullOrEmpty(alt.Key))
        {
            name = null;
            return false;
        }

        name = alt.Key;
        return true;
    }
}