用 C# 编写我的第一个 DSL,并沉迷于 func&行动

发布于 2024-08-12 12:06:23 字数 1065 浏览 8 评论 0原文

我正在尝试为工作中的一个简单工具编写我的第一个 DSL。我正在使用构建器模式来设置复杂的父对象,但在构建父对象的子集合时遇到了困难。这是一个示例:

使用:

var myMorningCoffee = Coffee.Make.WithCream().WithOuncesToServe(16);

带有闭包的示例(我认为这就是它们的名称):

var myMorningCoffee = Coffee.Make.WithCream().PourIn( 
                        x => {
                                x.ShotOfExpresso.AtTemperature(100);
                                x.ShotOfExpresso.AtTemperature(100).OfPremiumType();
                             }
                        ).WithOuncesToServe(16);

示例类(没有子 PourIn() 方法,因为这是我想要弄清楚的。)

 public class Coffee
 {
   private bool _cream;

   public Coffee Make { get new Coffee(); }
   public Coffee WithCream()
   {
     _cream = true;
     return this;
   }
   public Coffee WithOuncesToServe(int ounces)
   {
     _ounces = ounces;
     return this;
   }
 }

所以在我的工作应用程序中,我构建复杂的对象就好了,但我一生都无法弄清楚如何为父对象上的子集合编码 lambda。 (在本例中是浓缩咖啡的镜头(子集合))。

也许我在这里混淆了概念,但我不介意被澄清;然而,我真的很喜欢它的读法,并且想弄清楚如何让它发挥作用。

谢谢, 山姆

I'm taking a crack at writing my first DSL for a simple tool at work. I'm using the builder pattern to setup the complex parent object but am running into brick walls for building out the child collections of the parent object. Here's a sample:

Use:

var myMorningCoffee = Coffee.Make.WithCream().WithOuncesToServe(16);

Sample with closure (I think that's what they're called):

var myMorningCoffee = Coffee.Make.WithCream().PourIn( 
                        x => {
                                x.ShotOfExpresso.AtTemperature(100);
                                x.ShotOfExpresso.AtTemperature(100).OfPremiumType();
                             }
                        ).WithOuncesToServe(16);

Sample class (without the child PourIn() method as this is what I'm trying to figure out.)

 public class Coffee
 {
   private bool _cream;

   public Coffee Make { get new Coffee(); }
   public Coffee WithCream()
   {
     _cream = true;
     return this;
   }
   public Coffee WithOuncesToServe(int ounces)
   {
     _ounces = ounces;
     return this;
   }
 }

So in my app for work I have the complex object building just fine, but I can't for the life of me figure out how to get the lambda coded for the sub collection on the parent object. (in this example it's the shots (child collection) of expresso).

Perhaps I'm confusing concepts here and I don't mind being set straight; however, I really like how this reads and would like to figure out how to get this working.

Thanks,
Sam

如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。

扫码二维码加入Web技术交流群

发布评论

需要 登录 才能够评论, 你可以免费 注册 一个本站的账号。

评论(3

似最初 2024-08-19 12:06:23

好的,我想出了如何使用附加表达式生成器来编写 DSL。这就是我希望 DSL 的阅读方式:

var myPreferredCoffeeFromStarbucks =
            Coffee.Make.WithCream().PourIn(
                x =>
                    {
                        x.ShotOfExpresso().AtTemperature(100);
                        x.ShotOfExpresso().AtTemperature(100).OfPremiumType();
                    }
                ).ACupSizeInOunces(16);

这是我通过的测试:

[TestFixture]
public class CoffeeTests
{
    [Test]
    public void Can_Create_A_Caramel_Macchiato()
    {
        var myPreferredCoffeeFromStarbucks =
            Coffee.Make.WithCream().PourIn(
                x =>
                    {
                        x.ShotOfExpresso().AtTemperature(100);
                        x.ShotOfExpresso().AtTemperature(100).OfPremiumType();
                    }
                ).ACupSizeInOunces(16);

        Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Count == 2);
        Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Dequeue().IsOfPremiumType == true);
        Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Dequeue().IsOfPremiumType == false);
        Assert.IsTrue(myPreferredCoffeeFromStarbucks.CupSizeInOunces.Equals(16));
    }
}

这是我的 CoffeeExpressionBuilder DSL 类:

public class Coffee
{
    public List<ExpressoExpressionBuilder> expressoExpressions { get; private set; }

    public bool HasCream { get; private set; }
    public int CupSizeInOunces { get; private set; }

    public static Coffee Make
    {
        get
        {
            var coffee = new Coffee
                             {
                                 expressoExpressions = new List<ExpressoExpressionBuilder>()
                             };

            return coffee;
        }
    }

    public Coffee WithCream()
    {
        HasCream = true;
        return this;
    }

    public Coffee ACupSizeInOunces(int ounces)
    {
        CupSizeInOunces = ounces;

        return this;
    }

    public Coffee PourIn(Action<ExpressoExpressionBuilder> action)
    {
        var expression = new ExpressoExpressionBuilder();
        action.Invoke(expression);
        expressoExpressions.Add(expression);

        return this;
    }

    }

public class ExpressoExpressionBuilder
{
    public readonly Queue<ExpressoExpression> ExpressoShots = 
        new Queue<ExpressoExpression>();

    public ExpressoExpressionBuilder ShotOfExpresso()
    {
        var shot = new ExpressoExpression();
        ExpressoShots.Enqueue(shot);

        return this;
    }

    public ExpressoExpressionBuilder AtTemperature(int temp)
    {
        var recentlyAddedShot = ExpressoShots.Peek();
        recentlyAddedShot.Temperature = temp;

        return this;
    }

    public ExpressoExpressionBuilder OfPremiumType()
    {
        var recentlyAddedShot = ExpressoShots.Peek();
        recentlyAddedShot.IsOfPremiumType = true;

        return this;
    }
}

public class ExpressoExpression
{
    public int Temperature { get; set; }
    public bool IsOfPremiumType { get; set; }

    public ExpressoExpression()
    {
        Temperature = 0;
        IsOfPremiumType = false;
    }
}

欢迎任何和所有建议。

Ok, so I figured out how to write my DSL using an additional expression builder. This is how I wanted my DSL to read:

var myPreferredCoffeeFromStarbucks =
            Coffee.Make.WithCream().PourIn(
                x =>
                    {
                        x.ShotOfExpresso().AtTemperature(100);
                        x.ShotOfExpresso().AtTemperature(100).OfPremiumType();
                    }
                ).ACupSizeInOunces(16);

Here's my passing test:

[TestFixture]
public class CoffeeTests
{
    [Test]
    public void Can_Create_A_Caramel_Macchiato()
    {
        var myPreferredCoffeeFromStarbucks =
            Coffee.Make.WithCream().PourIn(
                x =>
                    {
                        x.ShotOfExpresso().AtTemperature(100);
                        x.ShotOfExpresso().AtTemperature(100).OfPremiumType();
                    }
                ).ACupSizeInOunces(16);

        Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Count == 2);
        Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Dequeue().IsOfPremiumType == true);
        Assert.IsTrue(myPreferredCoffeeFromStarbucks.expressoExpressions[0].ExpressoShots.Dequeue().IsOfPremiumType == false);
        Assert.IsTrue(myPreferredCoffeeFromStarbucks.CupSizeInOunces.Equals(16));
    }
}

And here's my CoffeeExpressionBuilder DSL class(s):

public class Coffee
{
    public List<ExpressoExpressionBuilder> expressoExpressions { get; private set; }

    public bool HasCream { get; private set; }
    public int CupSizeInOunces { get; private set; }

    public static Coffee Make
    {
        get
        {
            var coffee = new Coffee
                             {
                                 expressoExpressions = new List<ExpressoExpressionBuilder>()
                             };

            return coffee;
        }
    }

    public Coffee WithCream()
    {
        HasCream = true;
        return this;
    }

    public Coffee ACupSizeInOunces(int ounces)
    {
        CupSizeInOunces = ounces;

        return this;
    }

    public Coffee PourIn(Action<ExpressoExpressionBuilder> action)
    {
        var expression = new ExpressoExpressionBuilder();
        action.Invoke(expression);
        expressoExpressions.Add(expression);

        return this;
    }

    }

public class ExpressoExpressionBuilder
{
    public readonly Queue<ExpressoExpression> ExpressoShots = 
        new Queue<ExpressoExpression>();

    public ExpressoExpressionBuilder ShotOfExpresso()
    {
        var shot = new ExpressoExpression();
        ExpressoShots.Enqueue(shot);

        return this;
    }

    public ExpressoExpressionBuilder AtTemperature(int temp)
    {
        var recentlyAddedShot = ExpressoShots.Peek();
        recentlyAddedShot.Temperature = temp;

        return this;
    }

    public ExpressoExpressionBuilder OfPremiumType()
    {
        var recentlyAddedShot = ExpressoShots.Peek();
        recentlyAddedShot.IsOfPremiumType = true;

        return this;
    }
}

public class ExpressoExpression
{
    public int Temperature { get; set; }
    public bool IsOfPremiumType { get; set; }

    public ExpressoExpression()
    {
        Temperature = 0;
        IsOfPremiumType = false;
    }
}

Any and all suggestions are welcome.

只想待在家 2024-08-19 12:06:23

如果 .IncludeApps 接受 AppRegistrations 数组

IncludeApps(params IAppRegistration[] apps)

,那么

public static class App
{
  public static IAppRegistration IncludeAppFor(AppType type)
  {
    return new AppRegistration(type);
  }
}

public class AppRegistration
{
  private AppType _type;
  private bool _cost;

  public AppRegistration(AppType type)
  {
    _type = type;
  }

  public AppRegistration AtNoCost()
  { 
    _cost = 0;
    return this;
  }
}

最终它会看起来像这样......

.IncludeApps
(
  App.IncludeAppFor(AppType.Any), 
  App.IncludeAppFor(AppType.Any).AtNoCost()
)

在您的 IncludeApps 方法中,您将检查注册并根据需要创建对象。

What if .IncludeApps accepted an array of AppRegistrations

IncludeApps(params IAppRegistration[] apps)

then

public static class App
{
  public static IAppRegistration IncludeAppFor(AppType type)
  {
    return new AppRegistration(type);
  }
}

public class AppRegistration
{
  private AppType _type;
  private bool _cost;

  public AppRegistration(AppType type)
  {
    _type = type;
  }

  public AppRegistration AtNoCost()
  { 
    _cost = 0;
    return this;
  }
}

so eventually it would look like this...

.IncludeApps
(
  App.IncludeAppFor(AppType.Any), 
  App.IncludeAppFor(AppType.Any).AtNoCost()
)

Inside your IncludeApps method you would inspect the registrations and create the objects as required.

孤城病女 2024-08-19 12:06:23

要走委托路线,也许这样的事情会起作用?

var aPhone = MyPhone.Create;
  MyPhone.Create.IncludeApps
  (
    x =>
      {
        x.IncludeAppFor(new object());
      }
  );

class MyPhone
  {
    public MyPhone IncludeApps(Action<MyPhone> includeCommand)
    {
        includeCommand.Invoke(this);
        return this;
    }
  }

如果您没有设置委托路线,也许参数可以工作?

var anotherPhone = MyPhone.Create.IncludeApps(
    new IncludeAppClass(AppType.Math),
    new IncludeAppClass(AppType.Entertainment).AtNoCost());


class MyPhone
{
    internal MyPhone IncludeApps(params IncludeAppClass[] includeThese)
    {
        if (includeThese == null)
        {
            return this;
        }
        foreach (var item in includeThese)
        {
            this.Apps.Add(Item);
        }
        return this;
    }
}

To go the delegate route maybe something like this would work?

var aPhone = MyPhone.Create;
  MyPhone.Create.IncludeApps
  (
    x =>
      {
        x.IncludeAppFor(new object());
      }
  );

class MyPhone
  {
    public MyPhone IncludeApps(Action<MyPhone> includeCommand)
    {
        includeCommand.Invoke(this);
        return this;
    }
  }

If you aren't set on the delegate route maybe params would work?

var anotherPhone = MyPhone.Create.IncludeApps(
    new IncludeAppClass(AppType.Math),
    new IncludeAppClass(AppType.Entertainment).AtNoCost());


class MyPhone
{
    internal MyPhone IncludeApps(params IncludeAppClass[] includeThese)
    {
        if (includeThese == null)
        {
            return this;
        }
        foreach (var item in includeThese)
        {
            this.Apps.Add(Item);
        }
        return this;
    }
}
~没有更多了~
我们使用 Cookies 和其他技术来定制您的体验包括您的登录状态等。通过阅读我们的 隐私政策 了解更多相关信息。 单击 接受 或继续使用网站,即表示您同意使用 Cookies 和您的相关数据。
原文