public static int GetLineIndex(
this LinePosition linePosition,
LineBuffer lineBuffer,
LinePositionOptions options = LinePositionOptions.None)
{
int lineIndex = linePosition.GetLineIndex(lineBuffer.LineCount, options);
return(lineIndex);
}
/// <summary>
/// Translates the magic values (End, Beginning) into actual values based
/// on the given count.
/// </summary>
/// <param name="count">The number of items in the current collection.</param>
/// <returns>The normalized index.</returns>
/// <exception cref="System.IndexOutOfRangeException">Encountered an invalid index: + Index</exception>
public int GetLineIndex(
int count,
LinePositionOptions options = LinePositionOptions.None)
{
// All the magic values are negative, so if we don't have one, there is
// nothing to do.
if (Index >= 0)
{
// If we are beyond the string, throw an exception.
if (Index >= count)
{
// If we aren't doing bound checking, then we just return
// the end of the buffer.
if (options.HasFlag(LinePositionOptions.NoBoundsChecking))
{
return(count - 1);
}
// We have bounds checking, so throw an exception.
throw new IndexOutOfRangeException(
string.Format("Line position {0} is beyond line count {1}.", Index, count));
}
return(Index);
}
// If we have the end magic number, then the index is equal to the end
// of the text line.
if (Index == End.Index)
{
return(count - 1);
}
// If we got this far, then we have an invalid value.
if (options.HasFlag(LinePositionOptions.NoBoundsChecking))
{
return(0);
}
// We don't know how to process this, so throw an exception.
throw new IndexOutOfRangeException("Encountered an invalid index: " + Index);
}