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CommandLineHistory.cs

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 2016.0.1

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CommandLineHistory.cs

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// Copyright (c) 2010 Joe Moorhouse

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace PythonConsoleControl

{

/// <summary>

/// Stores the command line history for the PythonConsole.

/// </summary>

public class CommandLineHistory

{

List<string> lines = new List<string>();

int position;

public CommandLineHistory()

{

}

/// <summary>

/// Adds the command line to the history.

/// </summary>

public void Add(string line)

{

if (!String.IsNullOrEmpty(line))

{

int index = lines.Count - 1;

if (index >= 0)

{

if (lines[index] != line)

{

lines.Add(line);

}

}

else

{

lines.Add(line);

}

}

position = lines.Count;

}

/// <summary>

/// Gets the current command line. By default this will be the last command line entered.

/// </summary>

public string Current

{

get

{

if ((position >= 0) && (position < lines.Count))

{

return lines[position];

}

return null;

}

}

/// <summary>

/// Moves to the next command line.

/// </summary>

/// <returns>False if the current position is at the end of the command line history.</returns>

public bool MoveNext()

{

int nextPosition = position + 1;

if (nextPosition < lines.Count)

{

++position;

}

return nextPosition < lines.Count;

}

/// <summary>

/// Moves to the previous command line.

/// </summary>

/// <returns>False if the current position is at the start of the command line history.</returns>

public bool MovePrevious()

{

if (position >= 0)

{

if (position == 0)

{

return false;

}

--position;

}

return position >= 0;

}

}

}