DesignPatterns/BehaviorPattern/InterpreterPattern/MusicalExpression.cs at master · paylove/DesignPatterns · GitHub

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using System;

namespace InterpreterPattern
{
    internal abstract class MusicalExpression
    {
        public virtual void Interpret(PlayContext context)
        {
            if (string.IsNullOrEmpty(context.PlayText))
            {
                return;
            }

            var playKey = context.PlayText.Substring(0, 1);
            context.PlayText = context.PlayText.Substring(2);
            var playValue = context.PlayText.IndexOf(" ", StringComparison.Ordinal) > 0 ? Convert.ToDouble(context.PlayText.Substring(0, context.PlayText.IndexOf(" ", StringComparison.Ordinal))) : 0;

            context.PlayText = context.PlayText.Substring(context.PlayText.IndexOf(" ", StringComparison.Ordinal) + 1);

            Execute(playKey, playValue);
        }

        public abstract void Execute(string key, double value);
    }

    internal class MusicalNote : MusicalExpression
    {
        public override void Execute(string key, double value)
        {
            var note = string.Empty;
            switch (key)
            {
                case "C":
                    note = "1";
                    break;

                case "D":
                    note = "2";
                    break;

                case "E":
                    note = "3";
                    break;

                case "F":
                    note = "4";
                    break;

                case "G":
                    note = "5";
                    break;

                case "A":
                    note = "6";
                    break;

                case "B":
                    note = "7";
                    break;
            }

            Console.Write(note + " ");
        }
    }

    internal class MusicalScale : MusicalExpression
    {
        public override void Execute(string key, double value)
        {
            var scale = string.Empty;

            switch (value)
            {
                case 1:
                    scale = "低音";
                    break;

                case 2:
                    scale = "中音";
                    break;

                case 3:
                    scale = "高音";
                    break;
            }

            Console.Write(scale + " ");
        }
    }

    internal class MusicalSpeed : MusicalExpression
    {
        public override void Execute(string key, double value)
        {
            string speed;
            if (value < 500)
            {
                speed = "快速";
            }
            else if (value >= 1000)
            {
                speed = "快速";
            }
            else
            {
                speed = "中速";
            }
            Console.Write(speed + " ");
        }
    }
}