public void Interpret(PlayContext context)
{
if (context.PlayText.Length == 0)
{
return;
}
else
{
string playKey = context.PlayText.Substring(0, 1);
context.PlayText = context.PlayText.Substring(2);
double playValue = Convert.ToDouble(context.PlayText.Substring(0, context.PlayText.IndexOf(" ")));
context.PlayText = context.PlayText.Substring(context.PlayText.IndexOf(" ") + 1);
Excute(playKey, playValue);
}
}
static void Main(string[] args)
{
PlayContext context = new PlayContext();
Console.WriteLine("name：");
context.PlayText = " O 2 E 0.5 G 0.5 A 3 E 0.5 G 0.5 D 3 E ";
Expression expression = null;
try
{
while (context.PlayText.Length > 0)
{
string str = context.PlayText.Substring(0, 1);
switch (str)
{
//当首字段是O时，则表达式实例化为音阶。
case "O":
expression = new Scale();
break;
case "C":
case "D":
case "E":
case "F":
case "G":
case "A":
case "B":
case "P":
expression = new Note(); //当首字母是CDP时，则实例化音符。
break;
default:
break;
}
expression.Interpret(context);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}