/// <summary>
/// 解释器
/// </summary>
/// <param name="context"></param>
public void Interpret(PlayContext context)
{
if (context.PlayTest.Length == 0)
return;
else
{
string playKey = context.PlayTest.Substring(0, 1);
context.PlayTest = context.PlayTest.Substring(2);
double playValue = Convert.ToDouble(context.PlayTest.Substring(0, context.PlayTest.IndexOf(" ")));
context.PlayTest = context.PlayTest.Substring(context.PlayTest.IndexOf(" ") + 1);
Excute(playKey, playValue);
}
}
static void Main(string[] args)
{
//解释器模式:给定一个语言,定义它的文法的一种表示,并定义一个解释器,这个解释器使用该表示来解释语言中的句子
PlayContext context = new PlayContext();
//音乐-上海滩
Console.WriteLine("上海滩: ");
context.PlayTest = "T 800 O 2 E 0.5 G 0.5 A 3 E 0.5 G 0.5 D 3 E 0.5 G 0.5 A 0.5 O 3 C 1 O 2 A 0.5 G 1 C 0.5 E 0.5 D 3 ";
Expression exp = null;
try
{
while (context.PlayTest.Length > 0)
{
string str = context.PlayTest.Substring(0, 1);
switch (str)
{
case "O": exp = new Scale(); break;
case "T": exp = new Speed(); break;
case "C":
case "D":
case "E":
case "F":
case "G":
case "A":
case "B":
case "P": exp = new Note(); break;
default: break;
}
if (exp != null)
{
exp.Interpret(context);
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.Read();
}