public Commands ParseCommands(string[] args)
{
if(args.Length==0)
{
PrintHelp();
return null;
}
var commands=new Commands();
var state=CurrentState.Bare;
bool resetState=true;
foreach(var arg in args)
{
resetState=true;
if(state == CurrentState.Bare)
{
switch(arg)
{
case "--help":
PrintHelp();
return null;
case "--identify":
commands.Identify=true;
break;
case "--json":
commands.JsonOut=true;
break;
case "--verbose":
commands.Verbose=true;
break;
case "--trigger":
state=CurrentState.Trigger;
resetState=false;
break;
case "--frequency":
state=CurrentState.Frequency;
resetState=false;
break;
case "--samples":
state=CurrentState.Samples;
resetState=false;
break;
case "--config":
state=CurrentState.Config;
resetState=false;
break;
default:
if(commands.DeviceName==null)
{
commands.DeviceName=arg;
}
else if(commands.DataOut==null)
{
commands.DataOut=arg;
}
else
{
throw new ApplicationException("unexpected extra argument after dataout");
}
break;
}
}
else if(state == CurrentState.Trigger)
{
int n, v;
try
{
n=int.Parse(arg.Split(new char[]{'='})[0]);
v=int.Parse(arg.Split(new char[]{'='})[1]);
}catch
{
throw new ArgumentParseException("--trigger parameter is wrong. Should look like `N=V` where N and V are integers, like --trigger 10=1");
}
if(n>31 || n<0)
{
throw new ArgumentParseException("The channel number for a trigger can be no greater than 31 and no less than 0");
}
commands.Triggers.Add(n, v);
}
else if(state==CurrentState.Frequency)
{
int f=0;
if(!int.TryParse(arg, out f))
{
throw new ArgumentParseException("--frequency parameter is wrong. Should look like F where F is an integer, like --frequency 1000");
}
commands.Frequency=f;
}
else if(state==CurrentState.Samples)
{
int n=0;
if(!int.TryParse(arg, out n))
{
throw new ArgumentParseException("--samples parameter is wrong. Should look like N where N is an integer, like --samples 100");
}
commands.Samples=n;
}
else if(state==CurrentState.Config)
{
commands.ConfigFile=arg;
}
else
{
throw new NotImplementedException("that's not suppose to happen :/");
}
if(resetState)
{
state=CurrentState.Bare;
}
}
if(state!=CurrentState.Bare)
{
Console.WriteLine("Warning: probably an error parsing the last parameter on the command line");
}
if(commands.DeviceName==null)
{
throw new ArgumentParseException("No device name was given. See --help");
}
return commands;
}