static void InitShortNamesCacheRange(char first, char last)
{
for (var ch = first; ch <= last; ch++)
{
ShortNamesCache[ch] = new OptionNames(ShortOptionName.Parse(ch), null, null);
}
}
OptionSpec(OptionNames names, bool isFlag, bool isLongNameNegatable, bool isValueOptional, string valueName, string description)
{
Names = names ?? throw new ArgumentNullException(nameof(names));
IsFlag = isFlag;
IsLongNameNegatable = isLongNameNegatable;
IsValueOptional = isValueOptional;
ValueName = valueName;
Description = description;
}
public static OptionSpec Parse(string spec, ParseOptions options)
{
var tokens = spec.Split((char[])null, 2, StringSplitOptions.RemoveEmptyEntries);
var description = tokens.Length > 1 && tokens[1].Length > 0 ? tokens[1] : null;
var names = tokens[0].Split(PipeSeparator, 3, StringSplitOptions.RemoveEmptyEntries);
string name1 = null, name2 = null, name3 = null, valueName = null;
var isValueOptional = false;
var isFlag = false;
var isLongNameNegatable = false;
var i = 0;
foreach (var name in names)
{
var nameToken = name;
var ei = name.IndexOf('=');
if (ei < 0)
{
if ((options & ParseOptions.ForbidFlag) == ParseOptions.ForbidFlag)
{
throw new ArgumentException("Invalid option specification.", nameof(spec));
}
isFlag = true;
}
else
{
if ((options & ParseOptions.ForbidValue) == ParseOptions.ForbidValue)
{
throw new ArgumentException("Invalid option specification.", nameof(spec));
}
isFlag = false;
var bi = name.IndexOf('[');
if (ei == 0 || bi == 0)
{
throw new ArgumentException("Option specification is missing name.", nameof(spec));
}
if (bi > 0 && name[name.Length - 1] != ']')
{
throw new ArgumentException("Option specification has invalid syntax (missing ']').", nameof(spec));
}
isValueOptional = bi > 0 && bi + 1 == ei;
if (ei > 0)
{
nameToken = name.Substring(0, bi > 0 ? bi : ei);
var valueNameLength = name.Length - (ei + 1) - (isValueOptional ? 1 : 0);
if (valueNameLength > 0)
{
valueName = name.Substring(ei + 1, valueNameLength);
}
}
}
const string noPrefix = "[no-]";
if (nameToken.Length > noPrefix.Length && nameToken.StartsWith(noPrefix, StringComparison.Ordinal))
{
if ((options & ParseOptions.ForbidNoPrefix) == ParseOptions.ForbidNoPrefix)
{
throw new ArgumentException("Invalid option specification.", nameof(spec));
}
if (!isFlag)
{
throw new ArgumentException("Non-flag option specification cannot specify the \"[no-]\" prefix in its long name.", nameof(spec));
}
nameToken = nameToken.Substring(noPrefix.Length);
isLongNameNegatable = true;
}
switch (i)
{
case 0: name1 = nameToken; break;
case 1: name2 = nameToken; break;
case 2: name3 = nameToken; break;
default: Debug.Fail($"0 <= '{nameof(i)}' < 3"); break;
}
i++;
}
return(new OptionSpec(OptionNames.Guess(name1, name2, name3),
isFlag, isLongNameNegatable,
isValueOptional, valueName, description));
}
