/*

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 */

// utl_strlist.cc
//
// 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.
//
//	 For portability reasons we have decided to provide both this and
//	 an implementation of the list classes in terms of templates. If
//	 your compiler supports templates, please use the files in the
//	 include/utl_tmpl and util/utl_tmpl directories instead of the
//	 files by the same names in the include and util directories.

#include	<idl.hh>
#include	<idl_extern.hh>

/*
 * Constructor(s)
 */

UTL_StrList::UTL_StrList(String *s, UTL_StrList *cdr)
	   :  UTL_List(cdr),
             pd_car_data(s)
{
}

/*
 * Private operations
 */

/*
 * Public operations
 */

// Get list item
String *
UTL_StrList::head()
{
  return pd_car_data;
}

// Set list item
void
UTL_StrList::set_head(String *s)
{
  pd_car_data = s;
}

// Get last item of this list
String *
UTL_StrList::last_component()
{
  if (tail() == NULL)
    return pd_car_data;
  return ((UTL_StrList *) tail())->last_component();
}

// Copy a list
UTL_List *
UTL_StrList::copy()
{
  if (tail() == NULL)
    return new UTL_StrList(head(), NULL);
  return new UTL_StrList(head(), (UTL_StrList *) tail()->copy());
}

// AST Dumping
void
UTL_StrList::dump(std::ostream &o)
{
  char			      *s;
  UTL_StrlistActiveIterator *i = new UTL_StrlistActiveIterator(this);
  idl_bool		       first = I_TRUE;
  idl_bool		       second = I_FALSE;

  while (!(i->is_done())) {
    if (!first)
      o << "::";
    else if (second)
      first = second = I_FALSE;
    s = i->item()->get_string();
    o << s;
    if (first) {
      if (strcmp(s, "::") != 0)
	first = I_FALSE;
      else
	second = I_TRUE;
    }
    i->next();
  }
}

/*
 * Redefinition of inherited virtual operations
 */

// UTL_StrList active iterator

/*
 * Constructor
 */

UTL_StrlistActiveIterator::UTL_StrlistActiveIterator(UTL_StrList *s)
			   : UTL_ListActiveIterator(s)
{
}

/*
 * Private operations
 */

/*
 * Public operations
 */

// Get current item
String *
UTL_StrlistActiveIterator::item()
{
  if (source == NULL)
    return NULL;
  return ((UTL_StrList *) source)->head();
}

/*
 * Redefinition of inherited virtual operations
 */
