CommandOptions

CommandOptions.cs

using System;
using System.Collections.Generic;

/// <summary>
/// A class for parsing commands inside a tool. Based on Novell Options class (http://www.ndesk.org/Options).
/// </summary>
public class CommandOptions
{
	private Dictionary<string, Action<string[]>> _actions;
	private Dictionary<string, Action> _actionsNoParams;

	/// <summary>
	/// Initializes a new instance of the <see cref="CommandOptions"/> class.
	/// </summary>
	public CommandOptions()
	{
		_actions = new Dictionary<string, Action<string[]>>();
		_actionsNoParams = new Dictionary<string, Action>();
	}
	
	/// <summary>
	/// Adds a command option and an action to perform when the command is found.
	/// </summary>
	/// <param name="name">The name of the command.</param>
	/// <param name="action">An action delegate</param>
	/// <returns>The current CommandOptions instance.</returns>
	public CommandOptions Add(string name, Action action)
	{
		_actionsNoParams.Add(name, action);
		return this;
	}
	
	/// <summary>
	/// Adds a command option and an action (with parameter) to perform when the command is found.
	/// </summary>
	/// <param name="name">The name of the command.</param>
	/// <param name="action">An action delegate that has one parameter - string[] args.</param>
	/// <returns>The current CommandOptions instance.</returns>
	public CommandOptions Add(string name, Action<string[]> action)
	{
		_actions.Add(name, action);
		return this;
	}
	
	/// <summary>
	/// Parses the text command and calls any actions associated with the command.
	/// </summary>
	/// <param name="command">The text command, e.g "show databases"</param>
	public bool Parse(string command)
	{
		if (command.IndexOf(" ") == -1)
		{
			// No params
			foreach (string key in _actionsNoParams.Keys)
			{
				if (command == key)
				{
					_actionsNoParams[key].Invoke();
					return true;
				}
			}
		}
		else
		{
			// Params
			foreach (string key in _actions.Keys)
			{
				if (command.StartsWith(key) && command.Length > key.Length)
				{
					string options = command.Substring(key.Length);
					options = options.Trim();
					
					string[] parts = options.Split(' ');
					_actions[key].Invoke(parts);
	
					return true;
				}
			}
		}
		return false;
	}
}