/*=============================================================================*\
 * File: gfsmArcIter.hi
 * Author: Bryan Jurish <moocow@ling.uni-potsdam.de>
 * Description: finite state machine library: arc iterators: inline definitions
 *
 * Copyright (c) 2004-2007 Bryan Jurish.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *=============================================================================*/

/*======================================================================
 * Methods: Arc iterators: open/close
 */

//--------------------------------------------------------------
// open()
GFSM_INLINE
void gfsm_arciter_open(gfsmArcIter *aip, gfsmAutomaton *fsm, gfsmStateId stateid)
{
  aip->fsm = fsm;
  aip->state = gfsm_automaton_find_state(fsm,stateid);
  aip->arcs = NULL;
  gfsm_arciter_reset(aip);
}

//--------------------------------------------------------------
// open_ptr()
GFSM_INLINE
void gfsm_arciter_open_ptr(gfsmArcIter *aip, gfsmAutomaton *fsm, gfsmState *stateptr)
{
  aip->fsm = fsm;
  aip->state = stateptr;
  aip->arcs = NULL;
  gfsm_arciter_reset(aip);
}

//--------------------------------------------------------------
// reset()
GFSM_INLINE
void gfsm_arciter_reset(gfsmArcIter *aip) {
  if (aip->state && gfsm_state_is_ok(aip->state)) {
    aip->arcs = aip->state->arcs;
  } else {
    aip->arcs = NULL;
  }
}

//--------------------------------------------------------------
// close()
GFSM_INLINE
void gfsm_arciter_close(gfsmArcIter *aip) {
  if (!aip) return;
  aip->fsm   = NULL;
  aip->state = NULL;
  aip->arcs  = NULL;
}

//--------------------------------------------------------------
// copy()
GFSM_INLINE
gfsmArcIter *gfsm_arciter_copy(gfsmArcIter *dst, const gfsmArcIter *src) {
  *dst = *src;
  return dst;
}

//--------------------------------------------------------------
// clone()
GFSM_INLINE
gfsmArcIter *gfsm_arciter_clone(const gfsmArcIter *src) {
  return (gfsmArcIter*)gfsm_mem_dup_n(src,sizeof(gfsmArcIter));
}

/*======================================================================
 * Methods: Arc iterators: Accessors
 */

//--------------------------------------------------------------
// arc()
GFSM_INLINE
gfsmArc *gfsm_arciter_arc(const gfsmArcIter *aip)
{
  //return aip->arcs ? ((gfsmArc*)aip->arcs->data) : NULL;
  return aip->arcs ? (&(aip->arcs->arc)) : NULL;
}

//--------------------------------------------------------------
// ok()
GFSM_INLINE
gboolean gfsm_arciter_ok(const gfsmArcIter *aip)
{ return (aip != NULL && aip->arcs != NULL); }

//--------------------------------------------------------------
// next()
GFSM_INLINE
void gfsm_arciter_next(gfsmArcIter *aip)
{ if (aip && aip->arcs) aip->arcs = aip->arcs->next; }


//--------------------------------------------------------------
// seek_X()
//--EXTERN

//--------------------------------------------------------------
// remove()
GFSM_INLINE
void gfsm_arciter_remove(gfsmArcIter *aip)
{
  if (aip && aip->arcs) {
    gfsmArcList *next = aip->arcs->next;
    aip->state->arcs = gfsm_arclist_delete_node(aip->state->arcs, aip->arcs);
    aip->arcs = next;
  }
}