/**************************************************************************/
/*                          File: gram_state.h                            */
/**************************************************************************/
/* Project: Continuous Speech Recognition Search Algorithms               */
/* Author: Neeraj Deshmukh, Aravind Ganapathiraju                         */
/* Class: EE 8993 Spring 1996                        Date: March 27, 1996 */
/**************************************************************************/
 
/*========================================================================
  This file declares the grammar state class derived from the generic 
  linked list class that is used in the speech recognizer
  ========================================================================*/
 
/*------------------------------------------------------------------------
  make sure definitions are only made once
  ------------------------------------------------------------------------*/
#ifndef __ISIP_GRAM_STATE
#define __ISIP_GRAM_STATE
 
/*------------------------------------------------------------------------
  system and ISIP include files
  ------------------------------------------------------------------------*/
#include "linked_list.h"
 
/*------------------------------------------------------------------------
  forward declaration of classes
  ------------------------------------------------------------------------*/
class Linked_List;
class Trans_State;
class Gram_State;

/*========================================================================
  Gram_State
  class definition for the states of the grammar derived from the generic 
  linked list class
  ========================================================================*/
class Gram_State : public Linked_List {
  
  // members
  //
protected:
  
  String out_symbol_d;
  
  // methods
  //
public:

  /*--------------------------
    constructor and destructor
    --------------------------*/
  Gram_State (String out_name = "", Trans_State *trans_ptr = NULL);
  ~Gram_State ();

  /*----------------------
    input / output methods
    ----------------------*/
  String      get_state_name_cc ();
  void        set_state_name_cc (String out_name);
  float_8     get_transition_score_cc (String trans_state_name);
  void        add_transition_state_cc (Gram_State *trans_state, float_8 score);
  Trans_State *get_transition_cc ();

  /*-------------------------
    state linked list methods
    -------------------------*/
  Gram_State *get_next_state_cc ();
  Gram_State *get_prev_state_cc ();
  Gram_State *add_state_cc (String out_name, Trans_State *trans_ptr = NULL);
  Gram_State *find_state_cc (String out_name);
};

/*========================================================================
  Trans_State
  class definition for the state transitions of the grammar derived from 
  the generic linked list class
  ========================================================================*/
class Trans_State : public Linked_List {
  
  // members
  //
protected:
  
  float_8 trans_score_d;
  
  // methods
  //
public:

  /*--------------------------
    constructor and destructor
    --------------------------*/
  Trans_State (Gram_State *state_ptr = NULL, float_8 score = 0);
  ~Trans_State ();
  
  /*----------------------
    input / output methods
    ----------------------*/
  String   get_state_name_cc ();
  float_8  get_transition_score_cc (String trans_state_name = NULL);

  /*------------------------------------
    state transition linked list methods
    ------------------------------------*/
  Trans_State *get_next_transition_cc ();
  Trans_State *get_prev_transition_cc ();
  Trans_State *find_transition_cc (String trans_state_name);
  Trans_State *add_transition_state_cc (Gram_State *state_ptr, float_8 score);
};

#endif