
/*
 
COPYRIGHT
 
Copyright 1992, 1993, 1994 Sun Microsystems, Inc.  Printed in the United
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This product is protected by copyright and distributed under the following
license restricting its use.
 
The Interface Definition Language Compiler Front End (CFE) is made
available for your use provided that you include this license and copyright
notice on all media and documentation and the software program in which
this product is incorporated in whole or part. You may copy and extend
functionality (but may not remove functionality) of the Interface
Definition Language CFE without charge, but you are not authorized to
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program developed by you or with the express written consent of Sun
Microsystems, Inc. ("Sun").
 
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affiliates may not be used in advertising or publicity pertaining to
distribution of Interface Definition Language CFE as permitted herein.
 
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with this license.  Upon termination, you shall destroy or return all code
and documentation for the Interface Definition Language CFE.
 
INTERFACE DEFINITION LANGUAGE CFE IS PROVIDED AS IS WITH NO WARRANTIES OF
ANY KIND INCLUDING THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS
FOR A PARTICULAR PURPOSE, NONINFRINGEMENT, OR ARISING FROM A COURSE OF
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TO ASSIST IN ITS USE, CORRECTION, MODIFICATION OR ENHANCEMENT.
 
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 */

// utl_idlist.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.h"
#include "idl_extern.h"

/*
 * Constructor(s)
 */

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

/*
 * Private operations
 */

/*
 * Public operations
 */

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

   return (UTL_List *) new UTL_IdList(head(), (UTL_IdList *) tail()->copy());
}

// Get list item
Identifier *
UTL_IdList::head()
{
   return pd_car_data;
}

// Get last item of this list
Identifier *
UTL_IdList::last_component()
{
   if (tail() == NULL)
      return head();

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

// compare this list to another
long
UTL_IdList::compare(UTL_IdList* that) const
{
   long result = false;
   UTL_IdListActiveIterator ithis((UTL_IdList*)this);
   UTL_IdListActiveIterator ithat(that);

   while (!result)
   {
      // they have different lengths

      if ( (ithis.is_done() && !ithat.is_done()) ||
            (!ithis.is_done() && ithat.is_done()) )
      {
         break;
      }

      // they're the same to the last one
      if (ithis.is_done() && ithat.is_done())
      {
         result = true;
         break;
      }
      else
      {
         // let's compare this component
         Identifier * thisid = ithis.item();
         Identifier * thatid = ithat.item();

         // this identifier isn't the same

         if (!thisid->compare(thatid))
         {
            break;
         }
      }

      // increment
      ithis.next();

      ithat.next();
   }

   return result;
}



// AST Dumping
void
UTL_IdList::dump(ostream &o)
{
   UTL_IdListActiveIterator *i = new UTL_IdListActiveIterator(this);
   long first = true;
   long second = false;

   while (!(i->is_done()))
   {
      if (!first)
         o << "::";
      else if (second)
         first = second = false;

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

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

      i->next();
   }
}

/*
 * Redefinition of inherited virtual operations
 */

// UTL_IdList active iterator

/*
 * Constructor
 */

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

/*
 * Private operations
 */

/*
 * Public operations
 */

// Get current item
Identifier *
UTL_IdListActiveIterator::item()
{
   if (source == NULL)
      return NULL;

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

/*
 * Redefinition of inherited virtual operations
 */
