NDesk.Options/Mono.Options:具有多个键/值对的参数

Question

我需要解析以下命令行语法:

MyApplication.exe /p1 key1=value1 key2=value2 key3=value3 /p2

key1,key2和key3属于参数p1.

我在文档中找到了示例#3,它显示了解析单个键/值对的方法.

使用NDesk.Options解析单个参数的多个键/值对

Answer 1

还有一个更基本的问题:命令行上key = value集的数量是否有限制？

如果key = value集的数量是可变的,那么您希望使用默认处理程序允许的参数运行:<>

Dictionary<string, string> cur = null;
Dictionary<string, string> p1 = new Dictionary<string, string>();
Dictionary<string, string> p2 = new Dictionary<string, string>();
var p = new OptionSet () {
    { "p1", v => { cur = p1; } },
    { "p2", v => { cur = p2; } },
    { "<>", v => {
        string[] values = v.Split (new[]{'=', ':'}, 2);
        cur.Add (values [0], values [1]);
    } },
};

这将在之后拆分所有key = value选项/p1并将它们添加到p1字典中:

p.Parse (new[]{"/p1", "key1=value1", "key2=value2", "/p2"});
// `p1` now contains { { "key1", "value1" }, {"key2", "value2" } }

出于显而易见的原因,我认为上述是合理的方式.

但是,如果总有3组(因此需要6个值),则可以创建一个需要6个值的Option子类:

class ActionOption<T1, T2, T3, T4, T5, T6> : Option {
    Action<T1, T2, T3, T4, T5, T6> action;
    public ActionOption (string prototype, string description,
             Action<T1, T2, T3, T4, T5, T6> action)
        : base (prototype, description, 6)
    {
        this.action = action;
    }

    protected override void OnParseComplete (OptionContext c)
    {
        action (
                Parse<T1>(c.OptionValues [0], c)),
                Parse<T2>(c.OptionValues [1], c)),
                Parse<T3>(c.OptionValues [2], c)),
                Parse<T4>(c.OptionValues [3], c)),
                Parse<T5>(c.OptionValues [4], c)),
                Parse<T6>(c.OptionValues [5], c)));
    }
}

然后,您可以将此ActionOption提供给OptionSet.Add(Option):

var p = new OptionSet {
    new ActionOption<string, string, string, string, string, string> (
            "p1", null, (a, b, c, d, e, f) => {...}),
};

Answer 2

NDesk.Options有特殊的语法来支持这个:

        var pars = new Hashtable();
        var opts = new NDesk.Options.OptionSet{
            {"p={:}{/}", (n,v) => pars.Add(n, v)}
        };

现在您可以使用命令行运行您的程序,如下所示:

-p=key1:value1 -p=key2/value2

请注意,您可以在选项配置中设置对分隔符.在这个例子中它是[:/]