private TextSeparator? IsCommentSeparator(string s)
{
for(int i = 0; i < commentSeparators.Count; i++) {
if(commentSeparators[i].start.Equals(s) ||
(commentSeparators[i].hasEnd && commentSeparators[i].end.Equals(s))) {
return commentSeparators[i];
}
}
return null;
}