watch.c

NASA 开发使用的一个专家系统

   /*******************************************************/
   /*      "C" Language Integrated Production System      */
   /*                                                     */
   /*             CLIPS Version 6.05  04/09/97            */
   /*                                                     */
   /*                    WATCH MODULE                     */
   /*******************************************************/
                   
                   
/*************************************************************/
/* Purpose: Support functions for the watch and unwatch      */
/*   commands.                                               */
/*                                                           */
/* Principal Programmer(s):                                  */
/*      Gary D. Riley                                        */
/*                                                           */
/* Contributing Programmer(s):                               */
/*      Brian Donnell                                        */
/*                                                           */
/* Revision History:                                         */
/*                                                           */
/*************************************************************/

#define _WATCH_SOURCE_

#include "setup.h"

#if DEBUGGING_FUNCTIONS

#include <stdio.h>
#define _CLIPS_STDIO_
#include <string.h>

#include "constant.h"
#include "clipsmem.h"
#include "router.h"
#include "argacces.h"
#include "extnfunc.h"
#include "watch.h"

/*************************/
/* STRUCTURE DEFINITIONS */
/*************************/

struct watchItem
  {
   char *name;
   int *flag;
   int code,priority;
#if ANSI_COMPILER
   BOOLEAN (*accessFunc)(int,int,struct expr *);
   BOOLEAN (*printFunc)(char *,int,struct expr *);
#else
   BOOLEAN (*accessFunc)();
   BOOLEAN (*printFunc)();
#endif
   struct watchItem *next;
  };

/***************************************/
/* LOCAL INTERNAL FUNCTION DEFINITIONS */
/***************************************/

#if ANSI_COMPILER
   static struct watchItem       *ValidWatchItem(char *,int *);
   static BOOLEAN                 RecognizeWatchRouters(char *);
   static int                     CaptureWatchPrints(char *,char *);
#else
   static struct watchItem       *ValidWatchItem();
   static BOOLEAN                 RecognizeWatchRouters();
   static int                     CaptureWatchPrints();
#endif

/***************************************/
/* LOCAL INTERNAL VARIABLE DEFINITIONS */
/***************************************/

   static struct watchItem      *ListOfWatchItems = NULL;

/*************************************************************/
/* AddWatchItem: Adds an item to the list of watchable items */
/*   that can be set using the watch and unwatch commands.   */
/*   Returns FALSE if the item is already in the list,       */
/*   otherwise returns TRUE.                                 */
/*************************************************************/
globle BOOLEAN AddWatchItem(name,code,flag,priority,accessFunc,printFunc)
  char *name;
  int *flag;
  int code,priority;
#if ANSI_COMPILER
  BOOLEAN (*accessFunc)(int,int,struct expr *);
  BOOLEAN (*printFunc)(char *,int,struct expr *);
#else
  BOOLEAN (*accessFunc)();
  BOOLEAN (*printFunc)();
#endif
  {
   struct watchItem *newPtr, *currentPtr, *lastPtr;

   /*================================================================*/
   /* Find the insertion point in the watchable items list to place  */
   /* the new item. If the item is already in the list return FALSE. */
   /*================================================================*/
   
   for (currentPtr = ListOfWatchItems, lastPtr = NULL; 
        currentPtr != NULL; 
        currentPtr = currentPtr->next)
     {
      if (strcmp(currentPtr->name,name) == 0) return(CLIPS_FALSE);
      if (priority < currentPtr->priority) lastPtr = currentPtr;
     }
     
   /*============================*/
   /* Create the new watch item. */
   /*============================*/
   
   newPtr = get_struct(watchItem);
   newPtr->name = name;
   newPtr->flag = flag;
   newPtr->code = code;
   newPtr->priority = priority;
   newPtr->accessFunc = accessFunc;
   newPtr->printFunc = printFunc;
   
   /*=================================================*/
   /* Insert the new item in the list of watch items. */
   /*=================================================*/
   
   if (lastPtr == NULL)
     {
      newPtr->next = ListOfWatchItems;
      ListOfWatchItems = newPtr;
     }
   else
     {
      newPtr->next = lastPtr->next;
      lastPtr->next = newPtr;
     }

   /*==================================================*/
   /* Return TRUE to indicate the item has been added. */
   /*==================================================*/
   
   return(CLIPS_TRUE);
  }

/**************************************************/
/* Watch: C access routine for the watch command. */
/**************************************************/
globle BOOLEAN Watch(itemName)
  char *itemName;
  {
   return(SetWatchItem(itemName,ON,NULL));
  }
  
/******************************************************/
/* Unwatch: C access routine for the unwatch command. */
/******************************************************/
globle BOOLEAN Unwatch(itemName)
  char *itemName;
  {
   return(SetWatchItem(itemName,OFF,NULL));
  }
   
/********************************************************************/
/* SetWatchItem: Sets the state of a specified watch item to either */
/*   on or off. Returns TRUE if the item was set, otherwise FALSE.  */
/********************************************************************/
globle BOOLEAN SetWatchItem(itemName,newState,argExprs)
  char *itemName;
  int newState;
  struct expr *argExprs;
  {
   struct watchItem *wPtr;

   /*======================================================*/
   /* If the new state isn't on or off, then return FALSE. */
   /*======================================================*/
   
   if ((newState != ON) && (newState != OFF)) return(CLIPS_FALSE);

   /*===================================================*/
   /* If the name of the watch item to set is all, then */
   /* all watch items are set to the new state and TRUE */
   /* is returned.                                      */
   /*===================================================*/
   
   if (strcmp(itemName,"all") == 0)
     {
      for (wPtr = ListOfWatchItems; wPtr != NULL; wPtr = wPtr->next)
        {
         /*==============================================*/
         /* If no specific arguments are specified, then */
         /* set the global flag for the watch item.      */
         /*==============================================*/
                   
         if (argExprs == NULL) *(wPtr->flag) = newState;
         
         /*=======================================*/
         /* Set flags for individual watch items. */
         /*=======================================*/
         
         if ((wPtr->accessFunc == NULL) ? CLIPS_FALSE :
             ((*wPtr->accessFunc)(wPtr->code,newState,argExprs) == CLIPS_FALSE))
           {
            SetEvaluationError(CLIPS_TRUE);
            return(CLIPS_FALSE);
           }
        }
      return(CLIPS_TRUE);
     }

   /*=================================================*/
   /* Search for the watch item to be set in the list */
   /* of watch items. If found, set the watch item to */
   /* its new state and return TRUE.                  */
   /*=================================================*/
   
   for (wPtr = ListOfWatchItems; wPtr != NULL; wPtr = wPtr->next)
     {
      if (strcmp(itemName,wPtr->name) == 0)
        {
         /*==============================================*/
         /* If no specific arguments are specified, then */
         /* set the global flag for the watch item.      */
         /*==============================================*/
         
         if (argExprs == NULL) *(wPtr->flag) = newState;
         
         /*=======================================*/
         /* Set flags for individual watch items. */
         /*=======================================*/
         
         if ((wPtr->accessFunc == NULL) ? CLIPS_FALSE :
             ((*wPtr->accessFunc)(wPtr->code,newState,argExprs) == CLIPS_FALSE))
           {
            SetEvaluationError(CLIPS_TRUE);
            return(CLIPS_FALSE);
           }
           
         return(CLIPS_TRUE);
        }
     }

   /*=================================================*/
   /* If the specified item was not found in the list */
   /* of watchable items then return FALSE.           */
   /*=================================================*/

   return(CLIPS_FALSE);
  }

/*********************************************************************/
/* GetWatchItem: Gets the current state of the specified watch item. */
/*   Returns the state of the watch item (0 for off and 1 for on) if */
/*   the watch item is found in the list of watch items, otherwise   */
/*   -1 is returned.                                                 */               
/*********************************************************************/
globle int GetWatchItem(itemName)
  char *itemName;
  {
   struct watchItem *wPtr;
   
   for (wPtr = ListOfWatchItems; wPtr != NULL; wPtr = wPtr->next)
     { if (strcmp(itemName,wPtr->name) == 0) return(*(wPtr->flag)); }

   return(-1);
  }