public static TextData GetTextDataFrom(RichTextBox rtb, BaseTextData btd, string eol)
{
DbgValidateEol(eol);
DbgValidateEol(btd.Eol);
Debug.Assert(object.ReferenceEquals(rtb.Document, btd.TextPointers.Doc));
string text;
TextPointers textpointers;
if (btd.Eol == eol)
{
text = btd.Text;
}
else
{
text = btd.Text.Replace(btd.Eol, eol);
}
if (btd.Eol.Length == eol.Length)
{
textpointers = btd.TextPointers;
}
else
{
textpointers = new TextPointers(rtb.Document, eol.Length);
}
var(selection_start, selection_end) = GetSelection(rtb.Selection, textpointers);
return(new TextData(text, eol, textpointers, selection_start, selection_end));
}
internal readonly TextPointers TextPointers; // (maps string index of 'Text' to 'TextPointer')
#pragma warning restore CA1051 // Do not declare visible instance fields
internal BaseTextData(string text, string eol, TextPointers pointers)
{
Debug.Assert(eol.Length == pointers.EolLength);
Text = text;
Eol = eol;
TextPointers = pointers;
}
#pragma warning restore CA1051 // Do not declare visible instance fields
internal TextData(string text, string eol, TextPointers pointers, int selectionStart, int selectionEnd)
: base(text, eol, pointers)
{
SelectionStart = selectionStart;
SelectionEnd = selectionEnd;
}
static (int selection_start, int selection_end) GetSelection(TextSelection selection, TextPointers pointers)
{
// TODO: implement 'pointers.GetIndices' that takes two text pointers
int selection_start = Math.Max(0, pointers.GetIndex(selection.Start, LogicalDirection.Backward));
int selection_end = Math.Max(0, pointers.GetIndex(selection.End, LogicalDirection.Forward));
return(selection_start, selection_end);
}