/// <summary>
/// Store the supplied character at the specified position
/// </summary>
/// <param name="putPosition">x/y coordinate position to store the supplied character.</param>
/// <param name="value">the character to store.</param>
/// <exception cref="InvalidOperationException">Thrown when an invalid position is specified</exception>
public void PutValue(CoOrds putPosition, char value)
{
if (CheckPosition(putPosition))
{
char[] yChars = _befungeGrid[putPosition.y].ToCharArray();
yChars[putPosition.x] = value;
_befungeGrid[putPosition.y] = new string(yChars);
}
}
/// <summary>
/// Get the character at the specified position
/// </summary>
/// <returns>
/// Returns the character stored at the specified position
/// </returns>
/// <param name="getPosition">x/y coordinate of the character to retrieve.</param>
/// <exception cref="InvalidOperationException">Thrown when an invalid position is specified</exception>
public char GetValue(CoOrds getPosition)
{
char rtn = ' ';
if (CheckPosition(getPosition))
{
rtn = _befungeGrid[getPosition.y][getPosition.x];
}
return(rtn);
}
private bool CheckPosition(CoOrds checkPosition)
{
bool isValid = (0 <= checkPosition.x && checkPosition.x <= MaxExtent.x && 0 <= checkPosition.y && checkPosition.y <= MaxExtent.y);
if (!isValid)
{
string message = $"Invalid Position specified: [{checkPosition.x},{checkPosition.y}].";
throw new InvalidOperationException(message);
}
return(isValid);
}
/// <summary>
/// Create the BefungeRunTime
/// </summary>
/// <param name="befungeCode">A String containing befunge code.</param>
/// <param name="mode">The mode (Number or String).</param>
/// <param name="outputStream">An optional TextWriter. It can be used to output to a file.</param>
/// <param name="inputStream">An optional TextReader. It can be used to pass input from a file or the console.</param>
public BefungeRunTime(string befungeCode, IMode mode, TextWriter outputStream = null, TextReader inputStream = null)
{
_befungeGrid = CreateGridFromString(befungeCode);
_intStack = new Stack <int>();
CurrentPosition = new CoOrds(0, 0);
CurrentMode = mode;
ReadInstruction();
CurrentDirection = MoveRight.Instance;
EndProgram = false;
_outputStream = outputStream == null ? Console.Out : outputStream;
_inputStream = inputStream == null ? Console.In : inputStream;
}