public static bool IsDefinedCommand(this BFCommand command)
{
var definedTypes = ((BFCommandType[])Enum.GetValues(typeof(BFCommandType)))
.Where(x => !x.IsCommandTypeOf(BFCommandType.Undefined));
return(definedTypes.Contains(command.CommandType));
}
protected override IEnumerable <BFCommand> ParseByRow(string row)
{
BFCommand prevCommand = default;
for (int currentPos = 0; currentPos < row.Length;)
{
if (this.TryGetNextCommand(row, currentPos, out var command) && !prevCommand.IsBeginComment())
{
yield return(command);
prevCommand = command;
currentPos += command.Length;
continue;
}
else
{
command = this.GetTrivia(row, currentPos, prevCommand.IsBeginComment());
yield return(command);
prevCommand = command;
currentPos += command.Length;
continue;
}
}
}
private bool TryGetNextCommand(string row, int currentPos, out BFCommand command)
{
command = this._definedCommands
.FirstOrDefault(x => row.Substring(currentPos).StartsWith(x));
if (command.IsDefinedCommand())
{
command = new BFCommand(command, this._currentRowPos, currentPos);
return(true);
}
return(false);
}
private static string BuildErrorMessage(BFCommand command, string message = "")
{
var builder = new StringBuilder();
builder.Append($"BFRuntimeError at line:{command.RowPos + 1} index:{command.Pos + 1}.");
if (message.HasMeaningfulValue())
{
builder.AppendLine($" {message}");
}
else
{
builder.AppendLine();
}
builder.AppendLine(command.ToString());
return(builder.ToString());
}
public BFRuntimeException(BFCommand command, string message, System.Exception innerException) : base(BuildErrorMessage(command, message), innerException)
{
this.Command = command;
}
public BFRuntimeException(BFCommand command, string message) : base(BuildErrorMessage(command, message))
{
this.Command = command;
}
public static bool StartsWith(this string source, BFCommand command)
{
return(source.StartsWith(command.Command));
}
public static bool IsUndefined(this BFCommand command)
{
return(command.CommandType.IsCommandTypeOf(BFCommandType.Undefined));
}
public static bool IsExecutable(this BFCommand command)
{
return(!(command.IsUndefined() || command.IsTrivia() || command.IsBeginComment() || command.IsEndComment()));
}
public static bool IsWrite(this BFCommand command)
{
return(command.CommandType.IsCommandTypeOf(BFCommandType.Write));
}
public static bool IsEndComment(this BFCommand command)
{
return(command.CommandType.IsCommandTypeOf(BFCommandType.EndComment));
}
public static bool IsRead(this BFCommand command)
{
return(command.CommandType.IsCommandTypeOf(BFCommandType.Read));
}
public static bool IsLoopTail(this BFCommand command)
{
return(command.CommandType.IsCommandTypeOf(BFCommandType.LoopTail));
}
public static bool IsMoveLeft(this BFCommand command)
{
return(command.CommandType.IsCommandTypeOf(BFCommandType.MoveLeft));
}
public static bool IsDecrement(this BFCommand command)
{
return(command.CommandType.IsCommandTypeOf(BFCommandType.Decrement));
}
public static bool IsTrivia(this BFCommand command)
{
return(command.CommandType.IsCommandTypeOf(BFCommandType.Trivia));
}
