internal void Insert (Line line, int pos, bool update_caret, string s)
{
Insert (line, pos, update_caret, s, line.FindTag (pos));
}
/// <summary>
/// Scans the next paragraph for http:/ ftp:/ www. https:/ etc and marks the tags
/// as links.
/// </summary>
/// <param name="start_line">The line to start on</param>
/// <param name="link_changed">marks as true if something is changed</param>
private void ScanForLinks (Line start_line, ref bool link_changed)
{
Line current_line = start_line;
StringBuilder line_no_breaks = new StringBuilder ();
StringBuilder line_link_record = new StringBuilder ();
ArrayList cumulative_length_list = new ArrayList ();
bool update_caret_tag = false;
cumulative_length_list.Add (0);
while (current_line != null) {
line_no_breaks.Append (current_line.text);
if (link_changed == false)
current_line.LinkRecord (line_link_record);
current_line.ClearLinks ();
cumulative_length_list.Add (line_no_breaks.Length);
if (current_line.ending == LineEnding.Wrap)
current_line = GetLine (current_line.LineNo + 1);
else
break;
}
// search for protocols.. make sure www. is first!
string [] search_terms = new string [] { "www.", "http:/", "ftp:/", "https:/" };
int search_found = 0;
int index_found = 0;
string line_no_breaks_string = line_no_breaks.ToString ();
int line_no_breaks_index = 0;
int link_end = 0;
while (true) {
if (line_no_breaks_index >= line_no_breaks_string.Length)
break;
index_found = FirstIndexOfAny (line_no_breaks_string, search_terms, line_no_breaks_index, out search_found);
//no links found on this line
if (index_found == -1)
break;
if (search_found == 0) {
// if we are at the end of the line to analyse and the end of the line
// is "www." then there are no links here
if (line_no_breaks_string.Length == index_found + search_terms [0].Length)
break;
// if after www. we don't have a letter a digit or a @ or - or /
// then it is not a web address, we should continue searching
if (char.IsLetterOrDigit (line_no_breaks_string [index_found + search_terms [0].Length]) == false &&
"@/~".IndexOf (line_no_breaks_string [index_found + search_terms [0].Length].ToString ()) == -1) {
line_no_breaks_index = index_found + search_terms [0].Length;
continue;
}
}
link_end = line_no_breaks_string.Length - 1;
line_no_breaks_index = line_no_breaks_string.Length;
// we've found a link, we just need to find where it ends now
for (int i = index_found + search_terms [search_found].Length; i < line_no_breaks_string.Length; i++) {
if (line_no_breaks_string [i - 1] == '.') {
if (char.IsLetterOrDigit (line_no_breaks_string [i]) == false &&
"@/~".IndexOf (line_no_breaks_string [i].ToString ()) == -1) {
link_end = i - 1;
line_no_breaks_index = i;
break;
}
} else {
if (char.IsLetterOrDigit (line_no_breaks_string [i]) == false &&
"@-/:~.?=_&".IndexOf (line_no_breaks_string [i].ToString ()) == -1) {
link_end = i - 1;
line_no_breaks_index = i;
break;
}
}
}
string link_text = line_no_breaks_string.Substring (index_found, link_end - index_found + 1);
int current_cumulative = 0;
// we've found a link - index_found -> link_end
// now we just make all the tags as containing link and
// point them to the text for the whole link
current_line = start_line;
//find the line we start on
for (current_cumulative = 1; current_cumulative < cumulative_length_list.Count; current_cumulative++)
if ((int)cumulative_length_list [current_cumulative] > index_found)
break;
current_line = GetLine (start_line.LineNo + current_cumulative - 1);
// find the tag we start on
LineTag current_tag = current_line.FindTag (index_found - (int)cumulative_length_list [current_cumulative - 1] + 1);
if (current_tag.Start != (index_found - (int)cumulative_length_list [current_cumulative - 1]) + 1) {
if (current_tag == CaretTag)
update_caret_tag = true;
current_tag = current_tag.Break ((index_found - (int)cumulative_length_list [current_cumulative - 1]) + 1);
}
// set the tag
current_tag.IsLink = true;
current_tag.LinkText = link_text;
//go through each character
// find the tag we are in
// skip the number of characters in the tag
for (int i = 1; i < link_text.Length; i++) {
// on to a new word-wrapped line
if ((int)cumulative_length_list [current_cumulative] <= index_found + i) {
current_line = GetLine (start_line.LineNo + current_cumulative++);
current_tag = current_line.FindTag (index_found + i - (int)cumulative_length_list [current_cumulative - 1] + 1);
current_tag.IsLink = true;
current_tag.LinkText = link_text;
continue;
}
if (current_tag.End < index_found + 1 + i - (int)cumulative_length_list [current_cumulative - 1]) {
// skip empty tags in the middle of the URL
do {
current_tag = current_tag.Next;
} while (current_tag.Length == 0);
current_tag.IsLink = true;
current_tag.LinkText = link_text;
}
}
//if there are characters left in the tag after the link
// split the tag
// make the second part a non link
if (current_tag.End > (index_found + link_text.Length + 1) - (int)cumulative_length_list [current_cumulative - 1]) {
if (current_tag == CaretTag)
update_caret_tag = true;
current_tag.Break ((index_found + link_text.Length + 1) - (int)cumulative_length_list [current_cumulative - 1]);
}
}
if (update_caret_tag) {
CaretTag = LineTag.FindTag (CaretLine, CaretPosition);
link_changed = true;
} else {
if (link_changed == false) {
current_line = start_line;
StringBuilder new_link_record = new StringBuilder ();
while (current_line != null) {
current_line.LinkRecord (new_link_record);
if (current_line.ending == LineEnding.Wrap)
current_line = GetLine (current_line.LineNo + 1);
else
break;
}
if (new_link_record.Equals (line_link_record) == false)
link_changed = true;
}
}
}
internal void PositionCaret(Line line, int pos) {
caret.tag = line.FindTag (pos);
MoveCaretToTextTag ();
caret.line = line;
caret.pos = pos;
if (owner.IsHandleCreated) {
if (owner.Focused) {
if (caret.height != caret.tag.Height)
XplatUI.CreateCaret (owner.Handle, caret_width, caret.height);
XplatUI.SetCaretPos(owner.Handle,
offset_x + (int)caret.tag.Line.widths[caret.pos] + caret.line.X - viewport_x,
offset_y + caret.line.Y + caret.tag.Shift - viewport_y + caret_shift);
}
if (CaretMoved != null) CaretMoved(this, EventArgs.Empty);
}
// We set this at the end because we use the heights to determine whether or
// not we need to recreate the caret
caret.height = caret.tag.Height;
}
