/// accept - Potentially accept the current argument, returning a
/// new Argument instance, or 0 if the option does not accept this
/// argument (or the argument is missing values).
///
/// If the option accepts the current argument, accept() sets
/// Index to the position where argument parsing should resume
/// (even if the argument is missing values).
///
/// \param ArgSize The number of bytes taken up by the matched Option prefix
/// and name. This is used to determine where joined values
/// start.
public Argument Accept(ArgumentList args,
ref int index,
int argSize)
{
var unaliasedOption = GetUnaliasedOption();
string spelling;
// If the option was an alias, get the spelling from the unaliased one.
if (GetId() == unaliasedOption.GetId())
{
spelling = args.GetArgString(index).Substring(0,
argSize);
}
else
{
spelling = args.MakeArgString(unaliasedOption.GetPrefix() + unaliasedOption.GetName());
}
var kind = GetKind();
if (kind == OptionKind.FlagClass)
{
if (argSize != args.GetArgString(index).Length)
{
return(null);
}
var a = new Argument(unaliasedOption,
spelling,
index++);
if (!string.IsNullOrEmpty(GetAliasArgs()))
{
var vals = GetAliasArgs().Split(new[] { " " },
StringSplitOptions.RemoveEmptyEntries);
a.GetValues().AddRange(vals.Select(item => item));
//while (*Val != '\0')
//{
// A.getValues().AddRange(Val);
// // Move past the '\0' to the next argument.
// Val += Val.Length + 1;
//}
}
if (unaliasedOption.GetKind() == OptionKind.JoinedClass &&
string.IsNullOrEmpty(GetAliasArgs()))
{
a.GetValues().Add(string.Empty);
}
return(a);
}
else if (kind == OptionKind.JoinedClass)
{
string value = args.GetArgString(index).Substring(argSize);
return(new Argument(unaliasedOption,
spelling,
index++,
value));
}
else if (kind == OptionKind.CommaJoinedClass)
{
// Always matches.
var str = args.GetArgString(index).Substring(argSize).
Split(new[] { ',' },
StringSplitOptions.RemoveEmptyEntries); // + ArgSize;
var a = new Argument(unaliasedOption,
spelling,
index++);
a.GetValues().AddRange(str.Select(item => item));
a.SetOwnsValues(true);
return(a);
}
else if (kind == OptionKind.SeparateClass)
{
// Matches iff this is an exact match.
// FIXME: Avoid strlen.
if (argSize != args.GetArgString(index).Length)
{
return(null);
}
index += 2;
if (index > args.GetNumInputArgStrings() ||
args.GetArgString(index - 1) == null)
{
return(null);
}
return(new Argument(unaliasedOption,
spelling,
index - 2,
args.GetArgString(index - 1)));
}
else if (kind == OptionKind.MultiArgClass)
{
// Matches iff this is an exact match.
// FIXME: Avoid strlen.
if (argSize != args.GetArgString(index).Length)
{
return(null);
}
index += 1 + GetNumArgs();
if (index > args.GetNumInputArgStrings())
{
return(null);
}
var a = new Argument(unaliasedOption,
spelling,
index - 1 - GetNumArgs(),
args.GetArgString(index - GetNumArgs()));
for (var i = 1; i != GetNumArgs(); ++i)
{
a.GetValues().Add(args.GetArgString(index - GetNumArgs() + i));
}
return(a);
}
else if (kind == OptionKind.JoinedOrSeparateClass)
{
// If this is not an exact match, it is a joined arg.
// FIXME: Avoid strlen.
if (argSize != args.GetArgString(index).Length)
{
var value = args.GetArgString(index).Substring(argSize);
return(new Argument(this,
spelling,
index++,
value));
}
// Otherwise it must be separate.
index += 2;
if (index > args.GetNumInputArgStrings() ||
args.GetArgString(index - 1) == null)
{
return(null);
}
return(new Argument(unaliasedOption,
spelling,
index - 2,
args.GetArgString(index - 1)));
}
else if (kind == OptionKind.JoinedAndSeparateClass)
{
// Always matches.
index += 2;
if (index > args.GetNumInputArgStrings() ||
args.GetArgString(index - 1) == null)
{
return(null);
}
return(new Argument(unaliasedOption,
spelling,
index - 2,
args.GetArgString(index - 2).Substring(argSize),
args.GetArgString(index - 1)));
}
else if (kind == OptionKind.RemainingArgsClass)
{
// Matches iff this is an exact match.
// FIXME: Avoid strlen.
if (argSize != args.GetArgString(index).Length)
{
return(null);
}
var a = new Argument(unaliasedOption,
spelling,
index++);
while (index < args.GetNumInputArgStrings() &&
args.GetArgString(index) != null)
{
a.GetValues().Add(args.GetArgString(index++));
}
return(a);
}
else if (kind == OptionKind.RemainingArgsJoinedClass)
{
var a = new Argument(unaliasedOption,
spelling,
index);
if (argSize != args.GetArgString(index).Length)
{
a.GetValues().Add(args.GetArgString(index).Substring(argSize));
}
index++;
while (index < args.GetNumInputArgStrings() &&
args.GetArgString(index) != null)
{
a.GetValues().Add(args.GetArgString(index++));
}
return(a);
}
throw new Exception("Invalid option kind!");
}