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crstrtgy.c
1074 lines (922 loc) · 36.5 KB
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crstrtgy.c
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/*******************************************************/
/* "C" Language Integrated Production System */
/* */
/* CLIPS Version 6.30 10/19/06 */
/* */
/* CONFLICT RESOLUTION STRATEGY MODULE */
/*******************************************************/
/*************************************************************/
/* Purpose: Used to determine where a new activation is */
/* placed on the agenda based on the current conflict */
/* resolution strategy (depth, breadth, mea, lex, */
/* simplicity, or complexity). Also provides the */
/* set-strategy and get-strategy commands. */
/* */
/* Principal Programmer(s): */
/* Gary D. Riley */
/* */
/* Contributing Programmer(s): */
/* */
/* Revision History: */
/* 6.23: Corrected compilation errors for files */
/* generated by constructs-to-c. DR0861 */
/* */
/* 6.24: Removed CONFLICT_RESOLUTION_STRATEGIES */
/* compilation flag. */
/* */
/* 6.30: Added salience groups to improve performance */
/* with large numbers of activations of different */
/* saliences. */
/* */
/* Removed pseudo-facts used for not CEs. */
/* */
/*************************************************************/
#define _CRSTRTGY_SOURCE_
#include <stdio.h>
#define _STDIO_INCLUDED_
#include <string.h>
#include "setup.h"
#if DEFRULE_CONSTRUCT
#include "constant.h"
#include "pattern.h"
#include "reteutil.h"
#include "argacces.h"
#include "agenda.h"
#include "envrnmnt.h"
#include "memalloc.h"
#include "crstrtgy.h"
#define GetMatchingItem(x,i) ((x->basis->binds[i].gm.theMatch != NULL) ? \
(x->basis->binds[i].gm.theMatch->matchingItem) : NULL)
/***************************************/
/* LOCAL INTERNAL FUNCTION DEFINITIONS */
/***************************************/
static ACTIVATION *PlaceDepthActivation(ACTIVATION *,struct salienceGroup *);
static ACTIVATION *PlaceBreadthActivation(ACTIVATION *,struct salienceGroup *);
static ACTIVATION *PlaceLEXActivation(void *,ACTIVATION *,struct salienceGroup *);
static ACTIVATION *PlaceMEAActivation(void *,ACTIVATION *,struct salienceGroup *);
static ACTIVATION *PlaceComplexityActivation(ACTIVATION *,struct salienceGroup *);
static ACTIVATION *PlaceSimplicityActivation(ACTIVATION *,struct salienceGroup *);
static ACTIVATION *PlaceRandomActivation(ACTIVATION *,struct salienceGroup *);
static int ComparePartialMatches(void *,ACTIVATION *,ACTIVATION *);
static char *GetStrategyName(int);
static unsigned long long *SortPartialMatch(void *,struct partialMatch *);
/******************************************************************/
/* PlaceActivation: Coordinates placement of an activation on the */
/* Agenda based on the current conflict resolution strategy. */
/******************************************************************/
globle void PlaceActivation(
void *theEnv,
ACTIVATION **whichAgenda,
ACTIVATION *newActivation,
struct salienceGroup *theGroup)
{
ACTIVATION *placeAfter = NULL;
/*================================================*/
/* Set the flag which indicates that a change has */
/* been made to the agenda. */
/*================================================*/
EnvSetAgendaChanged(theEnv,TRUE);
/*=============================================*/
/* Determine the location where the activation */
/* should be placed in the agenda based on the */
/* current conflict resolution strategy. */
/*==============================================*/
if (*whichAgenda != NULL)
{
switch (AgendaData(theEnv)->Strategy)
{
case DEPTH_STRATEGY:
placeAfter = PlaceDepthActivation(newActivation,theGroup);
break;
case BREADTH_STRATEGY:
placeAfter = PlaceBreadthActivation(newActivation,theGroup);
break;
case LEX_STRATEGY:
placeAfter = PlaceLEXActivation(theEnv,newActivation,theGroup);
break;
case MEA_STRATEGY:
placeAfter = PlaceMEAActivation(theEnv,newActivation,theGroup);
break;
case COMPLEXITY_STRATEGY:
placeAfter = PlaceComplexityActivation(newActivation,theGroup);
break;
case SIMPLICITY_STRATEGY:
placeAfter = PlaceSimplicityActivation(newActivation,theGroup);
break;
case RANDOM_STRATEGY:
placeAfter = PlaceRandomActivation(newActivation,theGroup);
break;
}
}
else
{
theGroup->first = newActivation;
theGroup->last = newActivation;
}
/*==============================================================*/
/* Place the activation at the appropriate place in the agenda. */
/*==============================================================*/
if (placeAfter == NULL) /* then place it at the beginning of then agenda. */
{
newActivation->next = *whichAgenda;
*whichAgenda = newActivation;
if (newActivation->next != NULL) newActivation->next->prev = newActivation;
}
else /* insert it in the agenda. */
{
newActivation->next = placeAfter->next;
newActivation->prev = placeAfter;
placeAfter->next = newActivation;
if (newActivation->next != NULL)
{ newActivation->next->prev = newActivation; }
}
}
/*******************************************************************/
/* PlaceDepthActivation: Determines the location in the agenda */
/* where a new activation should be placed for the depth */
/* strategy. Returns a pointer to the activation after which */
/* the new activation should be placed (or NULL if the */
/* activation should be placed at the beginning of the agenda). */
/*******************************************************************/
static ACTIVATION *PlaceDepthActivation(
ACTIVATION *newActivation,
struct salienceGroup *theGroup)
{
ACTIVATION *lastAct, *actPtr;
unsigned long long timetag;
/*============================================*/
/* Set up initial information for the search. */
/*============================================*/
timetag = newActivation->timetag;
if (theGroup->prev == NULL)
{ lastAct = NULL; }
else
{ lastAct = theGroup->prev->last; }
/*=========================================================*/
/* Find the insertion point in the agenda. The activation */
/* is placed before activations of lower salience and */
/* after activations of higher salience. Among activations */
/* of equal salience, the activation is placed before */
/* activations with an equal or lower timetag (yielding */
/* depth first traversal). */
/*=========================================================*/
actPtr = theGroup->first;
while (actPtr != NULL)
{
if (timetag < actPtr->timetag)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else
{ break; }
}
/*========================================*/
/* Update the salience group information. */
/*========================================*/
if ((lastAct == NULL) ||
((theGroup->prev != NULL) && (theGroup->prev->last == lastAct)))
{ theGroup->first = newActivation; }
if ((theGroup->last == NULL) || (theGroup->last == lastAct))
{ theGroup->last = newActivation; }
/*===========================================*/
/* Return the insertion point in the agenda. */
/*===========================================*/
return(lastAct);
}
/*******************************************************************/
/* PlaceBreadthActivation: Determines the location in the agenda */
/* where a new activation should be placed for the breadth */
/* strategy. Returns a pointer to the activation after which */
/* the new activation should be placed (or NULL if the */
/* activation should be placed at the beginning of the agenda). */
/*******************************************************************/
static ACTIVATION *PlaceBreadthActivation(
ACTIVATION *newActivation,
struct salienceGroup *theGroup)
{
unsigned long long timetag;
ACTIVATION *lastAct, *actPtr;
/*============================================*/
/* Set up initial information for the search. */
/*============================================*/
timetag = newActivation->timetag;
if (theGroup->last == NULL)
{
if (theGroup->prev == NULL)
{ lastAct = NULL; }
else
{ lastAct = theGroup->prev->last; }
}
else
{ lastAct = theGroup->last; }
/*=========================================================*/
/* Find the insertion point in the agenda. The activation */
/* is placed before activations of lower salience and */
/* after activations of higher salience. Among activations */
/* of equal salience, the activation is placed after */
/* activations with a lessor timetag (yielding breadth */
/* first traversal). */
/*=========================================================*/
actPtr = theGroup->last;
while (actPtr != NULL)
{
if (timetag < actPtr->timetag)
{
if (actPtr == theGroup->first)
{
if (theGroup->prev == NULL)
{ lastAct = NULL; }
else
{ lastAct = theGroup->prev->last; }
break;
}
else
{ actPtr = actPtr->prev; }
}
else
{
lastAct = actPtr;
break;
}
}
/*========================================*/
/* Update the salience group information. */
/*========================================*/
if ((lastAct == NULL) ||
((theGroup->prev != NULL) && (theGroup->prev->last == lastAct)))
{ theGroup->first = newActivation; }
if ((theGroup->last == NULL) || (theGroup->last == lastAct))
{ theGroup->last = newActivation; }
/*===========================================*/
/* Return the insertion point in the agenda. */
/*===========================================*/
return(lastAct);
}
/*******************************************************************/
/* PlaceLEXActivation: Determines the location in the agenda */
/* where a new activation should be placed for the lex */
/* strategy. Returns a pointer to the activation after which */
/* the new activation should be placed (or NULL if the */
/* activation should be placed at the beginning of the agenda). */
/*******************************************************************/
static ACTIVATION *PlaceLEXActivation(
void *theEnv,
ACTIVATION *newActivation,
struct salienceGroup *theGroup)
{
unsigned long long timetag;
ACTIVATION *lastAct, *actPtr;
int flag;
/*============================================*/
/* Set up initial information for the search. */
/*============================================*/
timetag = newActivation->timetag;
if (theGroup->prev == NULL)
{ lastAct = NULL; }
else
{ lastAct = theGroup->prev->last; }
/*================================================*/
/* Look first at the very end of the group to see */
/* if the activation should be placed there. */
/*================================================*/
actPtr = theGroup->last;
if (actPtr != NULL)
{
flag = ComparePartialMatches(theEnv,actPtr,newActivation);
if ((flag == LESS_THAN) ||
((flag == EQUAL) && (timetag > actPtr->timetag)))
{
theGroup->last = newActivation;
return(actPtr);
}
}
/*=========================================================*/
/* Find the insertion point in the agenda. The activation */
/* is placed before activations of lower salience and */
/* after activations of higher salience. Among activations */
/* of equal salience, the OPS5 lex strategy is used for */
/* determining placement. */
/*=========================================================*/
actPtr = theGroup->first;
while (actPtr != NULL)
{
flag = ComparePartialMatches(theEnv,actPtr,newActivation);
if (flag == LESS_THAN)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else if (flag == GREATER_THAN)
{ break; }
else /* flag == EQUAL */
{
if (timetag > actPtr->timetag)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else
{ break; }
}
}
/*========================================*/
/* Update the salience group information. */
/*========================================*/
if ((lastAct == NULL) ||
((theGroup->prev != NULL) && (theGroup->prev->last == lastAct)))
{ theGroup->first = newActivation; }
if ((theGroup->last == NULL) || (theGroup->last == lastAct))
{ theGroup->last = newActivation; }
/*===========================================*/
/* Return the insertion point in the agenda. */
/*===========================================*/
return(lastAct);
}
/*******************************************************************/
/* PlaceMEAActivation: Determines the location in the agenda */
/* where a new activation should be placed for the mea */
/* strategy. Returns a pointer to the activation after which */
/* the new activation should be placed (or NULL if the */
/* activation should be placed at the beginning of the agenda). */
/*******************************************************************/
static ACTIVATION *PlaceMEAActivation(
void *theEnv,
ACTIVATION *newActivation,
struct salienceGroup *theGroup)
{
unsigned long long timetag;
ACTIVATION *lastAct, *actPtr;
int flag;
long long cWhoset = 0, oWhoset = 0;
intBool cSet, oSet;
/*============================================*/
/* Set up initial information for the search. */
/*============================================*/
timetag = newActivation->timetag;
if (theGroup->prev == NULL)
{ lastAct = NULL; }
else
{ lastAct = theGroup->prev->last; }
/*================================================*/
/* Look first at the very end of the group to see */
/* if the activation should be placed there. */
/*================================================*/
actPtr = theGroup->last;
if (actPtr != NULL)
{
if (GetMatchingItem(newActivation,0) != NULL)
{
cWhoset = GetMatchingItem(newActivation,0)->timeTag;
cSet = TRUE;
}
else
{ cSet = FALSE; }
if (GetMatchingItem(actPtr,0) != NULL)
{
oWhoset = GetMatchingItem(actPtr,0)->timeTag;
oSet = TRUE;
}
else
{ oSet = FALSE; }
if ((cSet == FALSE) && (oSet == FALSE))
{ flag = ComparePartialMatches(theEnv,actPtr,newActivation); }
else if ((cSet == TRUE) && (oSet == FALSE))
{ flag = GREATER_THAN; }
else if ((cSet == FALSE) && (oSet == TRUE))
{ flag = LESS_THAN; }
else if (oWhoset < cWhoset)
{ flag = GREATER_THAN; }
else if (oWhoset > cWhoset)
{ flag = LESS_THAN; }
else
{ flag = ComparePartialMatches(theEnv,actPtr,newActivation); }
if ((flag == LESS_THAN) ||
((flag == EQUAL) && (timetag > actPtr->timetag)))
{
theGroup->last = newActivation;
return(actPtr);
}
}
/*=========================================================*/
/* Find the insertion point in the agenda. The activation */
/* is placed before activations of lower salience and */
/* after activations of higher salience. Among activations */
/* of equal salience, the OPS5 mea strategy is used for */
/* determining placement. */
/*=========================================================*/
actPtr = theGroup->first;
while (actPtr != NULL)
{
cWhoset = -1;
oWhoset = -1;
if (GetMatchingItem(newActivation,0) != NULL)
{ cWhoset = GetMatchingItem(newActivation,0)->timeTag; }
if (GetMatchingItem(actPtr,0) != NULL)
{ oWhoset = GetMatchingItem(actPtr,0)->timeTag; }
if (oWhoset < cWhoset)
{
if (cWhoset > 0) flag = GREATER_THAN;
else flag = LESS_THAN;
}
else if (oWhoset > cWhoset)
{
if (oWhoset > 0) flag = LESS_THAN;
else flag = GREATER_THAN;
}
else
{ flag = ComparePartialMatches(theEnv,actPtr,newActivation); }
if (flag == LESS_THAN)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else if (flag == GREATER_THAN)
{ break; }
else /* flag == EQUAL */
{
if (timetag > actPtr->timetag)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else
{ break; }
}
}
/*========================================*/
/* Update the salience group information. */
/*========================================*/
if ((lastAct == NULL) ||
((theGroup->prev != NULL) && (theGroup->prev->last == lastAct)))
{ theGroup->first = newActivation; }
if ((theGroup->last == NULL) || (theGroup->last == lastAct))
{ theGroup->last = newActivation; }
/*===========================================*/
/* Return the insertion point in the agenda. */
/*===========================================*/
return(lastAct);
}
/*********************************************************************/
/* PlaceComplexityActivation: Determines the location in the agenda */
/* where a new activation should be placed for the complexity */
/* strategy. Returns a pointer to the activation after which the */
/* new activation should be placed (or NULL if the activation */
/* should be placed at the beginning of the agenda). */
/*********************************************************************/
static ACTIVATION *PlaceComplexityActivation(
ACTIVATION *newActivation,
struct salienceGroup *theGroup)
{
int complexity;
unsigned long long timetag;
ACTIVATION *lastAct, *actPtr;
/*========================================*/
/* Set up initial information for search. */
/*========================================*/
timetag = newActivation->timetag;
complexity = newActivation->theRule->complexity;
if (theGroup->prev == NULL)
{ lastAct = NULL; }
else
{ lastAct = theGroup->prev->last; }
/*=========================================================*/
/* Find the insertion point in the agenda. The activation */
/* is placed before activations of lower salience and */
/* after activations of higher salience. Among activations */
/* of equal salience, the activation is placed before */
/* activations of equal or lessor complexity. */
/*=========================================================*/
actPtr = theGroup->first;
while (actPtr != NULL)
{
if (complexity < (int) actPtr->theRule->complexity)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else if (complexity > (int) actPtr->theRule->complexity)
{ break; }
else if (timetag > actPtr->timetag)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else
{ break; }
}
/*========================================*/
/* Update the salience group information. */
/*========================================*/
if ((lastAct == NULL) ||
((theGroup->prev != NULL) && (theGroup->prev->last == lastAct)))
{ theGroup->first = newActivation; }
if ((theGroup->last == NULL) || (theGroup->last == lastAct))
{ theGroup->last = newActivation; }
/*===========================================*/
/* Return the insertion point in the agenda. */
/*===========================================*/
return(lastAct);
}
/*********************************************************************/
/* PlaceSimplicityActivation: Determines the location in the agenda */
/* where a new activation should be placed for the simplicity */
/* strategy. Returns a pointer to the activation after which the */
/* new activation should be placed (or NULL if the activation */
/* should be placed at the beginning of the agenda). */
/*********************************************************************/
static ACTIVATION *PlaceSimplicityActivation(
ACTIVATION *newActivation,
struct salienceGroup *theGroup)
{
int complexity;
unsigned long long timetag;
ACTIVATION *lastAct, *actPtr;
/*============================================*/
/* Set up initial information for the search. */
/*============================================*/
timetag = newActivation->timetag;
complexity = newActivation->theRule->complexity;
if (theGroup->prev == NULL)
{ lastAct = NULL; }
else
{ lastAct = theGroup->prev->last; }
/*=========================================================*/
/* Find the insertion point in the agenda. The activation */
/* is placed before activations of lower salience and */
/* after activations of higher salience. Among activations */
/* of equal salience, the activation is placed after */
/* activations of equal or greater complexity. */
/*=========================================================*/
actPtr = theGroup->first;
while (actPtr != NULL)
{
if (complexity > (int) actPtr->theRule->complexity)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else if (complexity < (int) actPtr->theRule->complexity)
{ break; }
else if (timetag > actPtr->timetag)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else
{ break; }
}
/*========================================*/
/* Update the salience group information. */
/*========================================*/
if ((lastAct == NULL) ||
((theGroup->prev != NULL) && (theGroup->prev->last == lastAct)))
{ theGroup->first = newActivation; }
if ((theGroup->last == NULL) || (theGroup->last == lastAct))
{ theGroup->last = newActivation; }
/*===========================================*/
/* Return the insertion point in the agenda. */
/*===========================================*/
return(lastAct);
}
/*******************************************************************/
/* PlaceRandomActivation: Determines the location in the agenda */
/* where a new activation should be placed for the random */
/* strategy. Returns a pointer to the activation after which */
/* the new activation should be placed (or NULL if the */
/* activation should be placed at the beginning of the agenda). */
/*******************************************************************/
static ACTIVATION *PlaceRandomActivation(
ACTIVATION *newActivation,
struct salienceGroup *theGroup)
{
int randomID;
unsigned long long timetag;
ACTIVATION *lastAct, *actPtr;
/*============================================*/
/* Set up initial information for the search. */
/*============================================*/
timetag = newActivation->timetag;
randomID = newActivation->randomID;
if (theGroup->prev == NULL)
{ lastAct = NULL; }
else
{ lastAct = theGroup->prev->last; }
/*=========================================================*/
/* Find the insertion point in the agenda. The activation */
/* is placed before activations of lower salience and */
/* after activations of higher salience. Among activations */
/* of equal salience, the placement of the activation is */
/* determined through the generation of a random number. */
/*=========================================================*/
actPtr = theGroup->first;
while (actPtr != NULL)
{
if (randomID > actPtr->randomID)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else if (randomID < actPtr->randomID)
{ break; }
else if (timetag > actPtr->timetag)
{
lastAct = actPtr;
if (actPtr == theGroup->last)
{ break; }
else
{ actPtr = actPtr->next; }
}
else
{ break; }
}
/*========================================*/
/* Update the salience group information. */
/*========================================*/
if ((lastAct == NULL) ||
((theGroup->prev != NULL) && (theGroup->prev->last == lastAct)))
{ theGroup->first = newActivation; }
if ((theGroup->last == NULL) || (theGroup->last == lastAct))
{ theGroup->last = newActivation; }
/*===========================================*/
/* Return the insertion point in the agenda. */
/*===========================================*/
return(lastAct);
}
/*********************************************************/
/* SortPartialMatch: Creates an array of sorted timetags */
/* in ascending order from a partial match. */
/*********************************************************/
static unsigned long long *SortPartialMatch(
void *theEnv,
struct partialMatch *binds)
{
unsigned long long *nbinds;
unsigned long long temp;
int flag;
unsigned j, k;
/*====================================================*/
/* Copy the array. Use 0 to represent the timetags of */
/* negated patterns. Patterns matching fact/instances */
/* should have timetags greater than 0. */
/*====================================================*/
nbinds = (unsigned long long *) get_mem(theEnv,sizeof(long long) * binds->bcount);
for (j = 0; j < (unsigned) binds->bcount; j++)
{
if ((binds->binds[j].gm.theMatch != NULL) &&
(binds->binds[j].gm.theMatch->matchingItem != NULL))
{ nbinds[j] = binds->binds[j].gm.theMatch->matchingItem->timeTag; }
else
{ nbinds[j] = 0; }
}
/*=================*/
/* Sort the array. */
/*=================*/
for (flag = TRUE, k = binds->bcount - 1;
flag == TRUE;
k--)
{
flag = FALSE;
for (j = 0 ; j < k ; j++)
{
if (nbinds[j] < nbinds[j + 1])
{
temp = nbinds[j];
nbinds[j] = nbinds[j+1];
nbinds[j+1] = temp;
flag = TRUE;
}
}
}
/*===================*/
/* Return the array. */
/*===================*/
return(nbinds);
}
/**************************************************************************/
/* ComparePartialMatches: Compares two activations using the lex conflict */
/* resolution strategy to determine which activation should be placed */
/* first on the agenda. This lexicographic comparison function is used */
/* for both the lex and mea strategies. */
/**************************************************************************/
static int ComparePartialMatches(
void *theEnv,
ACTIVATION *actPtr,
ACTIVATION *newActivation)
{
int cCount, oCount, mCount, i;
unsigned long long *basis1, *basis2;
/*=================================================*/
/* If the activation already on the agenda doesn't */
/* have a set of sorted timetags, then create one. */
/*=================================================*/
basis1 = SortPartialMatch(theEnv,newActivation->basis);
basis2 = SortPartialMatch(theEnv,actPtr->basis);
/*==============================================================*/
/* Determine the number of timetags in each of the activations. */
/* The number of timetags to be compared is the lessor of these */
/* two numbers. */
/*==============================================================*/
cCount = newActivation->basis->bcount;
oCount = actPtr->basis->bcount;
if (oCount > cCount) mCount = cCount;
else mCount = oCount;
/*===========================================================*/
/* Compare the sorted timetags one by one until there are no */
/* more timetags to compare or the timetags being compared */
/* are not equal. If the timetags aren't equal, then the */
/* activation containing the larger timetag is placed before */
/* the activation containing the smaller timetag. */
/*===========================================================*/
for (i = 0 ; i < mCount ; i++)
{
if (basis1[i] < basis2[i])
{
rtn_mem(theEnv,sizeof(long long) * cCount,basis1);
rtn_mem(theEnv,sizeof(long long) * oCount,basis2);
return(LESS_THAN);
}
else if (basis1[i] > basis2[i])
{
rtn_mem(theEnv,sizeof(long long) * cCount,basis1);
rtn_mem(theEnv,sizeof(long long) * oCount,basis2);
return(GREATER_THAN);
}
}
rtn_mem(theEnv,sizeof(long long) * cCount,basis1);
rtn_mem(theEnv,sizeof(long long) * oCount,basis2);
/*==========================================================*/
/* If the sorted timetags are identical up to the number of */
/* timetags contained in the smaller partial match, then */
/* the activation containing more timetags should be */
/* placed before the activation containing fewer timetags. */
/*==========================================================*/
if (cCount < oCount) return(LESS_THAN);
else if (cCount > oCount) return(GREATER_THAN);
/*=========================================================*/
/* If the sorted partial matches for both activations are */
/* identical (containing the same number and values of */
/* timetags), then the activation associated with the rule */
/* having the highest complexity is placed before the */
/* other partial match. */
/*=========================================================*/
if (newActivation->theRule->complexity < actPtr->theRule->complexity)
{ return(LESS_THAN); }
else if (newActivation->theRule->complexity > actPtr->theRule->complexity)
{ return(GREATER_THAN); }
/*================================================*/
/* The two partial matches are equal for purposes */
/* of placement on the agenda for the lex and mea */
/* conflict resolution strategies. */
/*================================================*/
return(EQUAL);
}
/************************************/
/* EnvSetStrategy: C access routine */
/* for the set-strategy command. */
/************************************/
globle int EnvSetStrategy(
void *theEnv,
int value)
{
int oldStrategy;
oldStrategy = AgendaData(theEnv)->Strategy;
AgendaData(theEnv)->Strategy = value;
if (oldStrategy != AgendaData(theEnv)->Strategy) EnvReorderAgenda(theEnv,NULL);
return(oldStrategy);
}
/************************************/
/* EnvGetStrategy: C access routine */
/* for the get-strategy command. */
/************************************/
globle int EnvGetStrategy(
void *theEnv)
{
return(AgendaData(theEnv)->Strategy);
}
/********************************************/
/* GetStrategyCommand: H/L access routine */
/* for the get-strategy command. */
/********************************************/
globle void *GetStrategyCommand(
void *theEnv)
{
EnvArgCountCheck(theEnv,"get-strategy",EXACTLY,0);
return((SYMBOL_HN *) EnvAddSymbol(theEnv,GetStrategyName(EnvGetStrategy(theEnv))));
}
/********************************************/
/* SetStrategyCommand: H/L access routine */
/* for the set-strategy command. */
/********************************************/
globle void *SetStrategyCommand(
void *theEnv)
{
DATA_OBJECT argPtr;
char *argument;
int oldStrategy;
oldStrategy = AgendaData(theEnv)->Strategy;
/*=====================================================*/
/* Check for the correct number and type of arguments. */
/*=====================================================*/
if (EnvArgCountCheck(theEnv,"set-strategy",EXACTLY,1) == -1)
{ return((SYMBOL_HN *) EnvAddSymbol(theEnv,GetStrategyName(EnvGetStrategy(theEnv)))); }
if (EnvArgTypeCheck(theEnv,"set-strategy",1,SYMBOL,&argPtr) == FALSE)
{ return((SYMBOL_HN *) EnvAddSymbol(theEnv,GetStrategyName(EnvGetStrategy(theEnv)))); }
argument = DOToString(argPtr);
/*=============================================*/