private MObject EvalProgram(Program program, Environment env)
{
MObject rs = null;
foreach (var statement in program.Statements)
{
rs = Eval(statement, env);
if (rs == null)
{
return(rs);
}
var t = rs.GetType();
if (t == typeof(ReturnValue))
{
return(((ReturnValue)rs).value);
}
else if (t == typeof(Error))
{
return(rs);
}
}
return(rs);
}
private MObject UnwrapReturnValue(MObject obj)
{
if (obj.GetType() == typeof(ReturnValue))
{
return(((ReturnValue)obj).value);
}
return(obj);
}
