NullLib.CommandLine 1.1.0.2

NullLib.CommandLine

Index / 索引

1. This document has two version, English and Chinese.

   这个文档有两个版本, 英文和中文.

2. The following content is English version, to read Chinese version, scroll down.

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3. To read whole document, open file in source repository which name like "readme.language.md". readme.en-us.md for English

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4. For more information, go to Github

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EN-US

Easily calling methods defined in C# with a command string.

Usage

First of all, the basic type in NullLib.CommandLine for calling methods is CommandObject, it contains methods' information, such as MethodInfo, ParameterInfo, and attributes.

Then, a class which contains methods for being called should be defined, in this class, each method which will be called must has a Command attribute, and then, we will initialize a CommandObject instance with this type.

An example class:

public class AppCommands
{
    [Command]
    public void HelloWorld()
    {
        Console.WriteLine("Hello world!");
    }
}

Initialize a CommandObject instance, and loop execute command.

using System;
using NullLib.CommandLine;

class Program
{
    static CommandObject<AppCommands> AppCommandObject = new CommandObject<AppCommands>();   // new CommandObject instance
    static void Main(string[] args)
    {
        Console.WriteLine("Now input commands.");
        while (true)
        {
            Console.Write(">>> ");          // prompt
            string cmdline = Console.ReadLine();
            if (!AppCommandObject.TryExecuteCommand(cmdline, out var result))
            {
                if (result != null)             // if a method has no return value, then result is null.
	                Console.WriteLine(result);
            }
            else
            {
                Console.WriteLine("Command execute failed.");
            }
        }
    }
}

Run application, and input command:

Now input commands.
>>> HelloWorld
Hello world!

To pass parameters to method, specify ArgumentConverter for each parameter.

Let's add these methods to AppCommands

[Command(typeof(FloatArguConverter), typeof(FloatArguConverter))]      // the build-in ArgumentConverter in NullLib.CommandLine
public float Plus(float a, float b)
{
    return a + b;
}
[Command(typeof(FloatArguConverter))]        // if the following converters is same as the last one, you can ignore these
public float Mul(float a, float b)
{
    return a * b;
}
[Command(typeof(DoubleArguConverter))]
public double Log(double n, double newBase = Math.E)    // you can also use optional parameter
{
    return Math.Log(n, newBase);
}
[Command(typeof(ForeachArguConverter<FloatArguConverter>))]   // each string of array will be converted by FloatConverter
public float Sum(params float[] nums)                 // variable length parameter method is supported
{
    float result = 0;
    foreach (var i in nums)
        result += i;
    return result;
}
[Command(typeof(ArgutConverter))]        // if don't need to do any convertion, specify an 'ArguConverter'
public void Print(string txt)
{
    Console.WriteLine(txt);
}
[Command]                                // the defualt converter is 'ArgumentConverter', you can ignore these
public bool StringEquals(string txt1, string txt2)   // or specify 'null' to use the last converter (here is ArgumentConverter)
{
    return txt1.Equals(txt2);
}
[Command(typeof(EnumArguConverter<ConsoleColor>))]   // EnumConverter helps convert string to Enum type automatically.
public void SetBackground(ConsoleColor color)
{
    Console.BackgroundColor = color;
}

Run and input:

Now input commands.
>>> Plus 1 1
2
>>> Mul 2 4
8
>>> Log 8 2
3
>>> Log 8
2.07944154167984
>>> Sum 1 2 3 4
10
>>> Print "some text`tescaped char is also supported"
some text       escaped char is also supported
>>> StringEquals qwq awa
False
>>> SetBackground White
>>> SetBackground 0

ZH-CN

通过命令行字符串来方便快捷的调用 C# 中定义的方法

使用方式

首先, 在 NullLib.CommandLine 中用于调用方法的最基本类型是 CommandObject, 它包含了方法的各种信息, 例如 MethodInfo, ParameterInfo, 以及属性.

然后, 你需要定义一个包含要调用方法的类, 在这个类中, 每一个将被调用的方法都应该有一个 Command 属性, 之后我们将用这个类型实例化一个 CommandObject 实例.

一个示例类型:

public class AppCommands
{
    [Command]
    public void HelloWorld()
    {
        Console.WriteLine("Hello world!");
    }
}

实例化一个 CommandObject 对象, 然后循环执行指令.

using System;
using NullLib.CommandLine;

class Program
{
    static CommandObject<AppCommands> AppCommandObject = new CommandObject<AppCommands>();   // 实例化一个 CommandObject 对象
    static void Main(string[] args)
    {
        Console.WriteLine("Now input commands.");
        while (true)
        {
            Console.Write(">>> ");          // 提示符
            string cmdline = Console.ReadLine();
            if (!AppCommandObject.TryExecuteCommand(cmdline, out var result))
            {
                if (result != null)             // 如果一个方法没有返回值, 则结果是 null.
	                Console.WriteLine(result);
            }
            else
            {
                Console.WriteLine("Command execute failed.");
            }
        }
    }
}

运行程序, 并输入指令:

Now input commands.
>>> HelloWorld
Hello world!

为每一个参数指定 ArgumentConverter 以传递参数到方法.

那么, 我们再试试将这些方法添加到 AppCommands 中

[Command(typeof(FloatArguConverter), typeof(FloatArguConverter))]      // NullLib.CommandLine 中的内置 ArgumentConverter
public float Plus(float a, float b)
{
    return a + b;
}
[Command(typeof(FloatArguConverter))]        // 如果跟着的转换器与上一个是一样的, 那么你可以忽略它们
public float Mul(float a, float b)
{
    return a * b;
}
[Command(typeof(DoubleArguConverter))]
public double Log(double n, double newBase = Math.E)    // 你也可以使用可选参数
{
    return Math.Log(n, newBase);
}
[Command(typeof(ForeachArguConverter<FloatArguConverter>))]   // 数组中的每一个字符串都将被 FloatArguConverter 转换
public float Sum(params float[] nums)                 // 可变参数的方法也是受支持的
{
    float result = 0;
    foreach (var i in nums)
        result += i;
    return result;
}
[Command(typeof(ArgutConverter))]        // 如果不需要做任何转换, 则可以指定一个 'ArguConverter'
public void Print(string txt)
{
    Console.WriteLine(txt);
}
[Command]                                // 默认的转换器是 'ArguConverter', 在这种情况下你可以忽略它们
public bool StringEquals(string txt1, string txt2)   // 或者指定 'null' 来使用上一个转换器(在这里指 ArguConverter)
{
    return txt1.Equals(txt2);
}
[Command(typeof(EnumArguConverter<ConsoleColor>))]   // EnumConverter 可以用来将字符串自动转换为枚举类型
public void SetBackground(ConsoleColor color)
{
    Console.BackgroundColor = color;
}

Run and input:

Now input commands.
>>> Plus 1 1
2
>>> Mul 2 4
8
>>> Log 8 2
3
>>> Log 8
2.07944154167984
>>> Sum 1 2 3 4
10
>>> Print "一些文本`t转义字符也是受支持的"
一些文本	转义字符也是受支持的
>>> StringEquals qwq awa
False
>>> SetBackground White
>>> SetBackground 0