public int Main(int x, int y, int z)
{
ContextGrammar context = new ContextGrammar();
context.SetVariable("x", x);
context.SetVariable("y", y);
context.SetVariable("z", z);
IExpression expression = new SubtractExpression(new AddExpression(new NumberExpression("x"),
new NumberExpression("y")),
new NumberExpression("z"));
return(expression.Interpret(context));
}
public int Interpret(ContextGrammar context)
{
return(context.GetVariable(_name));
}
public int Interpret(ContextGrammar context)
{
return(_leftExpression.Interpret(context) - _rightExpression.Interpret(context));
}