/// <summary>
/// Returns the character as the specified document position.
/// </summary>
/// <param name="position">The zero-based document position of the character to get.</param>
/// <returns>The character at the specified <paramref name="position" />.</returns>
private static unsafe int GetCharAt(int position)
{
position = Clamp(position, 0, TextLength);
position = Lines.CharToBytePosition(position);
var nextPosition = Sci.Send(SciMsg.SCI_POSITIONRELATIVE, new IntPtr(position), new IntPtr(1)).ToInt32();
var length = (nextPosition - position);
if (length <= 1)
{
// Position is at single-byte character
return(Sci.Send(SciMsg.SCI_GETCHARAT, new IntPtr(position)).ToInt32());
}
// Position is at multibyte character
var bytes = new byte[length + 1];
fixed(byte *bp = bytes)
{
Sci_TextRange *range = stackalloc Sci_TextRange[1];
range->chrg.cpMin = position;
range->chrg.cpMax = nextPosition;
range->lpstrText = new IntPtr(bp);
Sci.Send(SciMsg.SCI_GETTEXTRANGE, IntPtr.Zero, new IntPtr(range));
var str = GetString(new IntPtr(bp), length, Encoding);
return(str[0]);
}
}
/// I keep those methods just in case, but they are either slower than their counterparts,
/// or their existence is unjustified...
#region Dont use...
/// <summary>
/// Deletes a range of text from the document.
/// </summary>
/// <param name="position">The zero-based character position to start deleting.</param>
/// <param name="length">The number of characters to delete.</param>
private static void DeleteRange(int position, int length)
{
var textLength = TextLength;
position = Clamp(position, 0, textLength);
length = Clamp(length, 0, textLength - position);
// Convert to byte position/length
var byteStartPos = Lines.CharToBytePosition(position);
var byteEndPos = Lines.CharToBytePosition(position + length);
Sci.Send(SciMsg.SCI_DELETERANGE, new IntPtr(byteStartPos), new IntPtr(byteEndPos - byteStartPos));
}