/// <summary>
/// Parses a set of arguments
/// </summary>
/// <param name="args">The arguments to parse</param>
/// <returns>The arguments</returns>
public IEnumerable<CommandLineArgument> ParseArguments(IEnumerable<string> args)
{
var soMap = options.Where(x => x.ShortOption != default(char)).ToDictionary(x => ShortOptionStylizer != null ? ShortOptionStylizer(x.ShortOption) : x.ShortOption);
var loMap = options.Where(x => x.LongOption != null).ToDictionary(x => LongOptionStylizer?.Invoke(x.LongOption) ?? x.LongOption);
var option = default(CommandLineOption);
var buffer = new StringBuilder();
var state = ParseState.Head;
var argbuf = new List<string>();
var pos = new CommandLineArgumentPosition(0, 0);
int pchr = int.MinValue;
foreach (var chr in new StringArrayEnumerable(args, -1, -2))
{
switch (pchr)
{
case -1:
pos.Argument++;
pos.Index = 0;
break;
case int.MinValue:
break;
default:
pos.Index++;
break;
}
pchr = chr;
switch (state)
{
#region "Discard"
case ParseState.Discard:
switch (chr)
{
case -1:
state = ParseState.Head;
break;
default:
break;
}
break;
#endregion
#region "Head"
case ParseState.Head:
switch (chr)
{
case -1:
argbuf.Add("");
if (option != null && option.MaximumArguments == argbuf.Count)
{
yield return new CommandLineArgument(option, argbuf.ToArray(), pos.Argument - argbuf.Count);
option = null;
argbuf.Clear();
}
break;
case -2:
if (argbuf.Count > 0 || option != null)
{
yield return new CommandLineArgument(option, argbuf.ToArray(), pos.Argument - argbuf.Count);
option = null;
argbuf.Clear();
}
break;
case '-':
state = ParseState.FirstDash;
break;
default:
state = ParseState.Body;
buffer.Clear();
buffer.Append((char)chr);
break;
}
break;
#endregion
#region "FirstDash"
case ParseState.FirstDash:
switch (chr)
{
case -1:
argbuf.Add("-");
if (option != null && option.MaximumArguments == argbuf.Count)
{
yield return new CommandLineArgument(option, argbuf.ToArray(), pos.Argument - argbuf.Count);
option = null;
argbuf.Clear();
}
state = ParseState.Head;
break;
case '-':
if (option != null)
{
yield return new CommandLineArgument(option, argbuf.ToArray(), pos.Argument - argbuf.Count);
option = null;
argbuf.Clear();
}
state = ParseState.SecondDash;
break;
default:
if (argbuf.Count > 0 || option != null)
{
yield return new CommandLineArgument(option, argbuf.ToArray(), pos.Argument - argbuf.Count);
option = null;
argbuf.Clear();
}
state = ParseState.SingleDash;
if (!soMap.TryGetValue((char)chr, out option))
{
var ex = new CommandLineParserException(string.Format("Unknown short option: {0}", (char)chr), pos);
if (Error != null)
Error(this, new CommandLineParser.ErrorEventArgs(ex));
else
throw ex;
}
break;
}
break;
#endregion
#region "SingleDash"
case ParseState.SingleDash:
switch (chr)
{
case -1:
if (option != null && option.MaximumArguments == 0)
{
yield return new CommandLineArgument(option, pos.Argument);
option = null;
}
state = ParseState.Head;
break;
case '=':
if (option == null)
{
buffer.Clear();
state = ParseState.Discard;
}
else if (option.MaximumArguments != 0)
{
buffer.Clear();
state = ParseState.Equals;
}
else
{
yield return new CommandLineArgument(option, pos.Argument);
option = null;
state = ParseState.Discard;
}
break;
default:
if (option != null)
yield return new CommandLineArgument(option);
if (!soMap.TryGetValue((char)chr, out option))
{
var ex = new CommandLineParserException(string.Format("Unknown short option: {0}", (char)chr), pos);
if (Error != null)
Error(this, new CommandLineParser.ErrorEventArgs(ex));
else
throw ex;
}
break;
}
break;
#endregion
#region "Equals"
case ParseState.Equals:
switch (chr)
{
case -1:
yield return new CommandLineArgument(option, buffer.ToString(), pos.Argument - 1);
option = null;
state = ParseState.Head;
break;
default:
buffer.Append((char)chr);
break;
}
break;
#endregion
#region "SecondDash"
case ParseState.SecondDash:
switch (chr)
{
case -1:
buffer.Clear();
state = ParseState.Tail;
break;
default:
if (argbuf.Count > 0 || option != null)
{
yield return new CommandLineArgument(option, argbuf.ToArray(), pos.Argument - argbuf.Count);
option = null;
argbuf.Clear();
}
buffer.Clear();
buffer.Append((char)chr);
state = ParseState.DoubleDash;
break;
}
break;
#endregion
#region "DoubleDash"
case ParseState.DoubleDash:
switch (chr)
{
case -1:
if (loMap.TryGetValue(buffer.ToString(), out option))
{
if (option.MaximumArguments == 0)
{
yield return new CommandLineArgument(option, pos.Argument);
option = null;
}
}
else
{
var ex = new CommandLineParserException(string.Format("Unknown long option: {0}", buffer.ToString()), pos);
if (Error != null)
Error(this, new CommandLineParser.ErrorEventArgs(ex));
else
throw ex;
}
state = ParseState.Head;
break;
case '=':
if (loMap.TryGetValue(buffer.ToString(), out option))
{
if (option.MaximumArguments != 0)
{
buffer.Clear();
state = ParseState.Equals;
}
else
{
yield return new CommandLineArgument(option, pos.Argument);
option = null;
state = ParseState.Discard;
}
}
else
{
var ex = new CommandLineParserException(string.Format("Unknown long option: {0}", buffer.ToString()), pos);
if (Error != null)
Error(this, new CommandLineParser.ErrorEventArgs(ex));
else
throw ex;
buffer.Clear();
state = ParseState.Discard;
}
break;
default:
buffer.Append((char)chr);
break;
}
break;
#endregion
#region "Tail"
case ParseState.Tail:
switch (chr)
{
case -2:
if (argbuf.Count > 0)
{
yield return new CommandLineArgument(option, argbuf.ToArray(), pos.Argument - argbuf.Count);
option = null;
argbuf.Clear();
}
break;
case -1:
argbuf.Add(buffer.ToString());
buffer.Clear();
break;
default:
buffer.Append((char)chr);
break;
}
break;
#endregion
#region "Body"
case ParseState.Body:
switch (chr)
{
case -1:
argbuf.Add(buffer.ToString());
if (option != null && option.MaximumArguments == argbuf.Count)
{
yield return new CommandLineArgument(option, argbuf.ToArray(), pos.Argument - argbuf.Count);
option = null;
argbuf.Clear();
}
state = ParseState.Head;
break;
default:
buffer.Append((char)chr);
break;
}
break;
#endregion
}
}
}
/// <summary>
/// Creates a new error args
/// </summary>
/// <param name="Error">The error</param>
public ErrorEventArgs(CommandLineParserException Error)
{
this.Error = Error;
}
