// utl_idlist.cpp,v 1.19 2006/06/15 18:56:10 parsons Exp

/*

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 */

// Implementation of a list of utl_string nodes.

// NOTE: This list class only works correctly because we use single public
//   inheritance, as opposed to multiple inheritance or public virtual.
//   It relies on a type-unsafe cast from UTL_List to subclasses, which
//   will cease to operate correctly if you use either multiple or
//   public virtual inheritance.

#include "utl_idlist.h"
#include "utl_identifier.h"
#include "ace/OS_Memory.h"
#include "ace/OS_NS_string.h"

// FUZZ: disable check_for_streams_include
#include "ace/streams.h"

ACE_RCSID (util,
           utl_idlist,
           "utl_idlist.cpp,v 1.19 2006/06/15 18:56:10 parsons Exp")

// Constructor
UTL_IdList::UTL_IdList (Identifier *s,
                        UTL_IdList *cdr)
  : UTL_List ((UTL_List *) cdr),
    pd_car_data (s)
{
}

// Public operations

// Copy a list.
UTL_List *
UTL_IdList::copy (void)
{
  UTL_IdList *retval = 0;

  if (this->tail () == 0)
    {
      ACE_NEW_RETURN (retval,
                      UTL_IdList (this->head ()->copy (),
                                  0),
                      0);
    }
  else
    {
      ACE_NEW_RETURN (retval,
                      UTL_IdList (this->head ()->copy (),
                                  (UTL_IdList *) this->tail ()->copy ()),
                      0);
    }

  return (UTL_List *) retval;
}

// Get list item.
Identifier *
UTL_IdList::head (void)
{
  return this->pd_car_data;
}

// Get last item of this list.
Identifier *
UTL_IdList::last_component (void)
{
  if (this->tail () == 0)
    {
      return this->head ();
    }

  return ((UTL_IdList *) this->tail ())->last_component ();
}

// Get first item of this list holding a non-empty string.
Identifier *
UTL_IdList::first_component (void)
{
  if (ACE_OS::strlen (this->pd_car_data->get_string ()) > 0)
    {
      return this->pd_car_data;
    }

  return ((UTL_IdList *) this->tail ())->first_component ();
}

int
UTL_IdList::compare (UTL_IdList *other)
{
  long this_length = this->length ();

  // Strip away any leading empty segments.

  if (ACE_OS::strlen (this->pd_car_data->get_string ()) == 0)
    {
      UTL_List *this_tail = this->tail ();

      if (this_tail == 0)
        {
          return 1;
        }

      return ((UTL_IdList *) this_tail)->compare (other);
    }

  if (ACE_OS::strlen (other->pd_car_data->get_string ()) == 0)
    {
      UTL_List *other_tail = other->tail ();

      if (other_tail == 0)
        {
          return 1;
        }

      return this->compare ((UTL_IdList *) other->tail ());
    }

  if (this_length != other->length ())
    {
      return 1;
   }

  Identifier *this_id = 0;
  Identifier *other_id = 0;

  for (UTL_IdListActiveIterator this_iter (this), other_iter (other);
       !this_iter.is_done ();
       this_iter.next (), other_iter.next ())
    {
      this_id = this_iter.item ();
      other_id = other_iter.item ();

      if (ACE_OS::strcmp (this_id->get_string (),
                          other_id->get_string ())
            != 0)
        {
          return 1;
        }
    }

  return 0;
}

// AST Dumping.
void
UTL_IdList::dump (ACE_OSTREAM_TYPE &o)
{
  long first = true;
  long second = false;

  for (UTL_IdListActiveIterator i (this);
       !i.is_done ();
       i.next ())
    {
      if (!first)
        {
          o << "::";
        }
      else if (second)
        {
          first = second = false;
        }

      i.item ()->dump (o);

      if (first)
        {
          if (ACE_OS::strcmp (i.item ()->get_string (), "::") != 0)
            {
              first = false;
            }
          else
            {
              second = true;
            }
        }
    }
}

void
UTL_IdList::destroy (void)
{
  if (this->pd_car_data != 0)
    {
      this->pd_car_data->destroy ();
      delete this->pd_car_data;
      this->pd_car_data = 0;
    }

  this->UTL_List::destroy ();
}

// UTL_IdList active iterator.

// Constructor
UTL_IdListActiveIterator::UTL_IdListActiveIterator (UTL_IdList *s)
  : UTL_ListActiveIterator (s)
{
}

// Public operations.

// Get current item.
Identifier *
UTL_IdListActiveIterator::item (void)
{
    if (this->source == 0)
      {
        return 0;
      }

    return ((UTL_IdList *) source)->head ();
}
