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);
Execute(playKey, playValue);
}
}
// 解释器模式 给定一种语言，定义它的文法表示，并定义一个解释器，该解释器用来根据文法表示来解释语言中的句子。
static void Interpreter()
{
PlayContext context = new PlayContext();
Console.WriteLine("上海滩：");
context.PlayText = "O 2 E 0.5 A 3 E 0.5 G";
Expression expression = null;
try
{
while (context.PlayText.Length > 0)
{
string str = context.PlayText.Substring(0, 1);
switch (str)
{
case "O":
expression = new Scale();
break;
case "C":
case "D":
case "E":
case "F":
case "G":
case "A":
case "B":
expression = new Note();
break;
}
expression.Interpret(context);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}