elst2.cpp

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  if (current) {                 //not removed so
                                 //set previous
    prev = current;
    started_cycling = TRUE;
  }
  else {
    if (ex_current_was_cycle_pt)
      cycle_pt = next;
  }
  current = next;
  next = current->next;

  #ifdef _DEBUG
  if (!current)
    NULL_DATA.error ("ELIST2_ITERATOR::forward", ABORT, NULL);
  if (!next)
    NULL_NEXT.error ("ELIST2_ITERATOR::forward", ABORT,
      "This is: %i  Current is: %i",
      (int) this, (int) current);
  #endif
  return current;
}


/***********************************************************************
 *							ELIST2_ITERATOR::backward
 *
 *  Move the iterator to the previous element of the list.
 *  REMEMBER: ALL LISTS ARE CIRCULAR.
 **********************************************************************/

ELIST2_LINK *ELIST2_ITERATOR::backward() {
  #ifdef _DEBUG
  if (!this)
    NULL_OBJECT.error ("ELIST2_ITERATOR::backward", ABORT, NULL);
  if (!list)
    NO_LIST.error ("ELIST2_ITERATOR::backward", ABORT, NULL);
  #endif
  if (list->empty ())
    return NULL;

  if (current) {                 //not removed so
                                 //set previous
    next = current;
    started_cycling = TRUE;
  }
  else {
    if (ex_current_was_cycle_pt)
      cycle_pt = prev;
  }
  current = prev;
  prev = current->prev;

  #ifdef _DEBUG
  if (!current)
    NULL_DATA.error ("ELIST2_ITERATOR::backward", ABORT, NULL);
  if (!prev)
    NULL_PREV.error ("ELIST2_ITERATOR::backward", ABORT,
      "This is: %i  Current is: %i",
      (int) this, (int) current);
  #endif
  return current;
}


/***********************************************************************
 *							ELIST2_ITERATOR::data_relative
 *
 *  Return the data pointer to the element "offset" elements from current.
 *  (This function can't be INLINEd because it contains a loop)
 **********************************************************************/

ELIST2_LINK *ELIST2_ITERATOR::data_relative(                //get data + or - ..
                                            INT8 offset) {  //offset from current
  ELIST2_LINK *ptr;

  #ifdef _DEBUG
  if (!this)
    NULL_OBJECT.error ("ELIST2_ITERATOR::data_relative", ABORT, NULL);
  if (!list)
    NO_LIST.error ("ELIST2_ITERATOR::data_relative", ABORT, NULL);
  if (list->empty ())
    EMPTY_LIST.error ("ELIST2_ITERATOR::data_relative", ABORT, NULL);
  #endif

  if (offset < 0)
    for (ptr = current ? current : next; offset++ < 0; ptr = ptr->prev);
  else
    for (ptr = current ? current : prev; offset-- > 0; ptr = ptr->next);

  #ifdef _DEBUG
  if (!ptr)
    NULL_DATA.error ("ELIST2_ITERATOR::data_relative", ABORT, NULL);
  #endif

  return ptr;
}


/***********************************************************************
 *							ELIST2_ITERATOR::exchange()
 *
 *  Given another iterator, whose current element is a different element on
 *  the same list list OR an element of another list, exchange the two current
 *  elements.  On return, each iterator points to the element which was the
 *  other iterators current on entry.
 *  (This function hasn't been in-lined because its a bit big!)
 **********************************************************************/

void ELIST2_ITERATOR::exchange(                              //positions of 2 links
                               ELIST2_ITERATOR *other_it) {  //other iterator
  const ERRCODE DONT_EXCHANGE_DELETED =
    "Can't exchange deleted elements of lists";

  ELIST2_LINK *old_current;

  #ifdef _DEBUG
  if (!this)
    NULL_OBJECT.error ("ELIST2_ITERATOR::exchange", ABORT, NULL);
  if (!list)
    NO_LIST.error ("ELIST2_ITERATOR::exchange", ABORT, NULL);
  if (!other_it)
    BAD_PARAMETER.error ("ELIST2_ITERATOR::exchange", ABORT, "other_it NULL");
  if (!(other_it->list))
    NO_LIST.error ("ELIST2_ITERATOR::exchange", ABORT, "other_it");
  #endif

  /* Do nothing if either list is empty or if both iterators reference the same
  link */

  if ((list->empty ()) ||
    (other_it->list->empty ()) || (current == other_it->current))
    return;

  /* Error if either current element is deleted */

  if (!current || !other_it->current)
    DONT_EXCHANGE_DELETED.error ("ELIST2_ITERATOR.exchange", ABORT, NULL);

  /* Now handle the 4 cases: doubleton list; non-doubleton adjacent elements
  (other before this); non-doubleton adjacent elements (this before other);
  non-adjacent elements. */

                                 //adjacent links
  if ((next == other_it->current) ||
  (other_it->next == current)) {
                                 //doubleton list
    if ((next == other_it->current) &&
    (other_it->next == current)) {
      prev = next = current;
      other_it->prev = other_it->next = other_it->current;
    }
    else {                       //non-doubleton with
                                 //adjacent links
                                 //other before this
      if (other_it->next == current) {
        other_it->prev->next = current;
        other_it->current->next = next;
        other_it->current->prev = current;
        current->next = other_it->current;
        current->prev = other_it->prev;
        next->prev = other_it->current;

        other_it->next = other_it->current;
        prev = current;
      }
      else {                     //this before other
        prev->next = other_it->current;
        current->next = other_it->next;
        current->prev = other_it->current;
        other_it->current->next = current;
        other_it->current->prev = prev;
        other_it->next->prev = current;

        next = current;
        other_it->prev = other_it->current;
      }
    }
  }
  else {                         //no overlap
    prev->next = other_it->current;
    current->next = other_it->next;
    current->prev = other_it->prev;
    next->prev = other_it->current;
    other_it->prev->next = current;
    other_it->current->next = next;
    other_it->current->prev = prev;
    other_it->next->prev = current;
  }

  /* update end of list pointer when necessary (remember that the 2 iterators
    may iterate over different lists!) */

  if (list->last == current)
    list->last = other_it->current;
  if (other_it->list->last == other_it->current)
    other_it->list->last = current;

  if (current == cycle_pt)
    cycle_pt = other_it->cycle_pt;
  if (other_it->current == other_it->cycle_pt)
    other_it->cycle_pt = cycle_pt;

  /* The actual exchange - in all cases*/

  old_current = current;
  current = other_it->current;
  other_it->current = old_current;
}


/***********************************************************************
 *							ELIST2_ITERATOR::extract_sublist()
 *
 *  This is a private member, used only by ELIST2::assign_to_sublist.
 *  Given another iterator for the same list, extract the links from THIS to
 *  OTHER inclusive, link them into a new circular list, and return a
 *  pointer to the last element.
 *  (Can't inline this function because it contains a loop)
 **********************************************************************/

ELIST2_LINK *ELIST2_ITERATOR::extract_sublist(                              //from this current
                                              ELIST2_ITERATOR *other_it) {  //to other current
  #ifdef _DEBUG
  const ERRCODE BAD_EXTRACTION_PTS =
    "Can't extract sublist from points on different lists";
  const ERRCODE DONT_EXTRACT_DELETED =
    "Can't extract a sublist marked by deleted points";
  #endif
  const ERRCODE BAD_SUBLIST = "Can't find sublist end point in original list";

  ELIST2_ITERATOR temp_it = *this;
  ELIST2_LINK *end_of_new_list;

  #ifdef _DEBUG
  if (!this)
    NULL_OBJECT.error ("ELIST2_ITERATOR::extract_sublist", ABORT, NULL);
  if (!other_it)
    BAD_PARAMETER.error ("ELIST2_ITERATOR::extract_sublist", ABORT,
      "other_it NULL");
  if (!list)
    NO_LIST.error ("ELIST2_ITERATOR::extract_sublist", ABORT, NULL);
  if (list != other_it->list)
    BAD_EXTRACTION_PTS.error ("ELIST2_ITERATOR.extract_sublist", ABORT, NULL);
  if (list->empty ())
    EMPTY_LIST.error ("ELIST2_ITERATOR::extract_sublist", ABORT, NULL);

  if (!current || !other_it->current)
    DONT_EXTRACT_DELETED.error ("ELIST2_ITERATOR.extract_sublist", ABORT,
      NULL);
  #endif

  ex_current_was_last = other_it->ex_current_was_last = FALSE;
  ex_current_was_cycle_pt = FALSE;
  other_it->ex_current_was_cycle_pt = FALSE;

  temp_it.mark_cycle_pt ();
  do {                           //walk sublist
    if (temp_it.cycled_list ())  //cant find end pt
      BAD_SUBLIST.error ("ELIST2_ITERATOR.extract_sublist", ABORT, NULL);

    if (temp_it.at_last ()) {
      list->last = prev;
      ex_current_was_last = other_it->ex_current_was_last = TRUE;
    }

    if (temp_it.current == cycle_pt)
      ex_current_was_cycle_pt = TRUE;

    if (temp_it.current == other_it->cycle_pt)
      other_it->ex_current_was_cycle_pt = TRUE;

    temp_it.forward ();
  }
                                 //do INCLUSIVE list
  while (temp_it.prev != other_it->current);

                                 //circularise sublist
  other_it->current->next = current;
                                 //circularise sublist
  current->prev = other_it->current;
  end_of_new_list = other_it->current;

                                 //sublist = whole list
  if (prev == other_it->current) {
    list->last = NULL;
    prev = current = next = NULL;
    other_it->prev = other_it->current = other_it->next = NULL;
  }
  else {
    prev->next = other_it->next;
    other_it->next->prev = prev;

    current = other_it->current = NULL;
    next = other_it->next;
    other_it->prev = prev;
  }
  return end_of_new_list;
}