public void Edit(string erased, string replacement)
{
int index = Written.LastIndexOf(erased);
Erase(erased);
if (string.IsNullOrWhiteSpace(Written.Substring(index, erased.Length)))
{
if (replacement.Length == erased.Length)
{
Written = Written.Remove(index, erased.Length).Insert(index, replacement);
}
else if (replacement.Length != erased.Length)
{
var sb = new StringBuilder(Written);
foreach (char c in replacement)
{
int i = index + replacement.IndexOf(c);
if (char.IsWhiteSpace(Written, i))
{
sb.Remove(i, 1).Insert(i, c);
}
else
{
sb.Remove(i, 1).Insert(i, '@');
}
}
Written = sb.ToString();
}
}
}
public void Erase(string erased)
{
int index = Written.LastIndexOf(erased);
string replacementString = "";
if (EraserDurability >= erased.Length)
{
replacementString = replacementString.PadRight(erased.Length);
Written = Written.Remove(index, erased.Length).Insert(index, replacementString);
EraserDurability -= erased.Length;
}
else
{
string erasedNew = erased.Substring(0, erased.Length - EraserDurability);
replacementString = erasedNew + replacementString.PadRight(EraserDurability);
Written = Written.Remove(index, erased.Length).Insert(index, replacementString);
EraserDurability = 0;
}
}