/// <summary>
/// Initialises a new instance of the <see cref="CommandLineOption{T}"/> class.
/// </summary>
/// <param name="shortName">The short name for this Option or <c>null</c> if not required. Either <paramref name="shortName"/> or <paramref name="longName"/> must not be <c>null</c>, <c>empty</c> or contain only <c>whitespace</c>.</param>
/// <param name="longName">The long name for this Option or <c>null</c> if not required. Either <paramref name="shortName"/> or <paramref name="longName"/> must not be <c>null</c>, <c>empty</c> or contain only <c>whitespace</c>.</param>
/// <param name="parser">The parser to use for this Option.</param>
/// <exception cref="ArgumentOutOfRangeException">Thrown if both <paramref name="shortName"/> and <paramref name="longName"/> are <c>null</c>, <c>empty</c> or contain only <c>whitespace</c>.</exception>
/// <exception cref="ArgumentNullException">If <paramref name="parser"/> is <c>null</c>.</exception>
public CommandLineOption(string shortName, string longName, ICommandLineOptionParser <T> parser)
{
if (parser == null)
{
throw new ArgumentNullException("parser");
}
this.ShortName = shortName;
this.LongName = longName;
this.Parser = parser;
}
/// <summary>
/// Adds the specified <see cref="ICommandLineOptionParser{T}"/> to this factories list of supported parsers.
/// If an existing parser has already been registered for the type then it will be replaced.
/// </summary>
/// <typeparam name="T">The type which the <see cref="ICommandLineOptionParser{T}"/> will be returned for.</typeparam>
/// <param name="parser">The parser to return for the specified type.</param>
/// <exception cref="ArgumentNullException">If <paramref name="parser"/> is <c>null</c>.</exception>
public void AddOrReplace <T>(ICommandLineOptionParser <T> parser)
{
if (parser == null)
{
throw new ArgumentNullException("parser");
}
var parserType = typeof(T);
// remove existing
this.Parsers.Remove(parserType);
this.Parsers.Add(parserType, parser);
}
internal static ICommandLineOptionParser <T> FindParser <T>()
{
ICommandLineOptionParser <T>?parser = null;
var optionType = typeof(T);
var parserType = optionType.Assembly.GetType($"{optionType.FullName}Parser", false, false);
// 尝试从目标程序集中查找一个命令行解析器。
if (parserType != null)
{
parser = Activator.CreateInstance(parserType) as ICommandLineOptionParser <T>;
}
// 如果找不到目标命令行解析器，那么就使用内置的运行时解析器。
return(parser ?? RuntimeCommandLineOptionParser <T> .Create());
}
public T As <T>(ICommandLineOptionParser <T> parser)
{
if (parser == null)
{
throw new ArgumentNullException(nameof(parser));
}
foreach (var optionValue in _optionArgs)
{
var option = optionValue.Key;
var values = optionValue.Value;
var valueCount = values?.Count ?? 0;
if (option.Length == 0)
{
// 没有选项，只有值。
// 包括此 if 分支之外的任何情况下，值都需要保持传入时的大小写。
if (valueCount > 0)
{
if (parser.Verb is null)
{
parser.SetValue(values !);
}
else
{
parser.SetValue(values !.Skip(1).ToList());
}
}
}
else if (option.Length == 1)
{
// 短名称。
var shortName = option[0];
if (parser is IRawCommandLineOptionParser <T> rawParser)
{
rawParser.SetValue(shortName, values);
}
else
{
if (valueCount == 0)
{
parser.SetValue(shortName, true);
}
else if (valueCount == 1)
{
if (bool.TryParse(values ![0], out var @bool))
public static CommandLineHandlerBuilder AddHandler <TVerb>(
this ICommandLineHandlerBuilder builder,
Action <TVerb> handler, ICommandLineOptionParser <TVerb>?parser = null)
{
if (builder is null)
{
throw new ArgumentNullException(nameof(builder));
}
builder.CommandLine.AddMatch <TVerb>(new CommandLineTypeMatcher <Task <int> >(typeof(TVerb),
verb => MatchWithHandler(builder.CommandLine, verb, options => Invoke(handler, options), parser)));
return(builder switch
{
CommandLineHandlerBuilder commandLineBuilder => commandLineBuilder,
CommandLine commandLine => new CommandLineHandlerBuilder(commandLine),
_ => throw new NotSupportedException($"接口 {nameof(ICommandLineHandlerBuilder)} 不支持第三方实现。"),
});
internal static CommandLineTypeMatchResult <int> MatchWithHandler <TVerb>(CommandLine commandLine, string?possibleVerb,
Func <TVerb, int> handler, ICommandLineOptionParser <TVerb>?parser)
{
if (handler == null)
{
throw new ArgumentNullException(nameof(handler));
}
// 为命令行参数类型寻找解析器。
parser ??= FindParser <TVerb>();
// 尝试匹配谓词，并执行处理器代码。
if (string.Equals(possibleVerb, parser.Verb, StringComparison.InvariantCultureIgnoreCase))
{
return(new CommandLineTypeMatchResult <int>(VerbMatchingResult.Matched,
typeof(TVerb), possibleVerb, () => handler(commandLine.As(parser))));
}
if (parser.Verb is null)
{
return(new CommandLineTypeMatchResult <int>(VerbMatchingResult.FallbackMatched,
typeof(TVerb), possibleVerb, () => handler(commandLine.As(parser))));
}
return(new CommandLineTypeMatchResult <int>(VerbMatchingResult.NotMatch,
typeof(TVerb), possibleVerb));
}
internal static CommandLineTypeMatchResult <int> MatchWithHandler <TVerb>(CommandLine commandLine, string?possibleVerb,
Action <TVerb> handler, ICommandLineOptionParser <TVerb>?parser)
{
return(MatchWithHandler(commandLine, possibleVerb, verb =>
{
handler(verb);
return 0;
}, parser));
}
internal static CommandLineFilterMatch MatchFilter <TFilter>(CommandLine commandLine, ICommandLineOptionParser <TFilter>?parser)
where TFilter : ICommandLineFilter
{
return(new CommandLineFilterMatch(typeof(TFilter), () => commandLine.As(parser ?? FindParser <TFilter>())));
}
internal static CommandLineTypeMatchResult <Task <int> > MatchWithHandler <TVerb>(CommandLine commandLine,
string?possibleVerb, Func <TVerb, Task> handler, ICommandLineOptionParser <TVerb>?parser)
{
return(MatchWithHandler(commandLine, possibleVerb, async verb =>
{
await handler(verb).ConfigureAwait(false);
return 0;
}, parser));
}
