public static Object For(Cons args, Environment environment)
{
Environment localEnvironment = new Environment(environment);
Runtime.Eval(args.First(), localEnvironment);
object test;
while ((Conversions.ObjectToBoolean(test = Runtime.Eval(args.Second(), localEnvironment))))
{
foreach (object item in (Cons)args.Cdddr())
{
Runtime.Eval(item, localEnvironment);
}
Runtime.Eval(args.Third(), localEnvironment);
}
return(test);
}
/// <summary>
/// (for initialiser test iterator statement)
/// The for special form corresponds to the for construct found in most algebraic
/// programming languages. The initialiser is executed. The statement is executed
/// while test is true. The iterator is executed at the end of each statement execution.
/// </summary>
/// <param name="args"></param>
/// <param name="environment"></param>
/// <returns></returns>
public static Object For(Cons args, Environment environment)
{
Environment localEnvironment = new Environment(environment);
Runtime.Eval(args.First(),localEnvironment);
object test;
while ((Conversions.ObjectToBoolean(test = Runtime.Eval(args.Second(),localEnvironment))))
{
foreach (object item in (Cons)args.Cdddr())
{
Runtime.Eval(item, localEnvironment);
}
Runtime.Eval(args.Third(),localEnvironment);
}
return test;
}
/// <summary>
/// (for initialiser test iterator statement)
/// </summary>
public static Object For(Cons args, LSharp.Environment environment)
{
//string v = "//(for " + Printer.ConsToString(args) + ")" + NewLine + "{" + NewLine;
string v = "{" + NewLine;
LSharp.Environment localEnvironment = new LSharp.Environment(environment);
v += Generate(args.First(),localEnvironment);
v += Generate(args.Second(),localEnvironment);
v += @"while ((Conversions.ObjectToBoolean(retval))
{
";
foreach (object item in (Cons)args.Cdddr())
{
v += Generate(item, localEnvironment);
}
v += Generate(args.Third(),localEnvironment);
v += Generate(args.Second(),localEnvironment);
v += @"}
";
return v + "}" + NewLine;
}