Unity Compiler Define Symbol Custom Menu Example

using UnityEngine;
using UnityEditor;
using System.Collections.Generic;

public class CompilerDefineMenuExample {

    const string defineString = "COMPILER_DEFINE_EXAMPLE";

    [MenuItem("Compiler Define Example/Enable")]
    static void Enable()
    {
        SetEnabled(true);
    }

    [MenuItem("Compiler Define Example/Enable", true)]
    static bool EnableValidate()
    {
        var defines = GetDefinesList();
        return !defines.Contains(defineString);
    }

    [MenuItem("Compiler Define Example/Disable")]
    static void Disable()
    {
        SetEnabled(false);
    }
    [MenuItem("Compiler Define Example/Disable", true)]
    static bool DisableValidate()
    {
        var defines = GetDefinesList();
        return defines.Contains(defineString);
    }

    static void SetEnabled(bool enable)
    {
        var defines = GetDefinesList();
        if (enable)
        {
            defines.Add(defineString);
            PlayerSettings.SetScriptingDefineSymbolsForGroup( BuildTargetGroup.Standalone, string.Join(";",defines.ToArray()) );

        } else  {
            defines.Remove(defineString);
            PlayerSettings.SetScriptingDefineSymbolsForGroup( BuildTargetGroup.Standalone, string.Join(";",defines.ToArray()) );
        }

    }

    static List<string> GetDefinesList()
    {
        return new List<string>( PlayerSettings.GetScriptingDefineSymbolsForGroup( BuildTargetGroup.Standalone ).Split(';'));
    }

}