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engine.c
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engine.c
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/*******************************************************/
/* "C" Language Integrated Production System */
/* */
/* CLIPS Version 6.30 10/19/06 */
/* */
/* ENGINE MODULE */
/*******************************************************/
/*************************************************************/
/* Purpose: Provides functionality primarily associated with */
/* the run and focus commands. */
/* */
/* Principal Programmer(s): */
/* Gary D. Riley */
/* */
/* Contributing Programmer(s): */
/* Bebe Ly */
/* Brian L. Dantes */
/* */
/* Revision History: */
/* 6.23: Correction for FalseSymbol/TrueSymbol. DR0859 */
/* */
/* Corrected compilation errors for files */
/* generated by constructs-to-c. DR0861 */
/* */
/* 6.24: Removed DYNAMIC_SALIENCE, INCREMENTAL_RESET, */
/* and LOGICAL_DEPENDENCIES compilation flags. */
/* */
/* Renamed BOOLEAN macro type to intBool. */
/* */
/* Added access functions to the HaltRules flag. */
/* */
/* Added EnvGetNextFocus, EnvGetFocusChanged, and */
/* EnvSetFocusChanged functions. */
/* */
/* 6.30: Added additional developer statistics to help */
/* analyze join network performance. */
/* */
/* Removed pseudo-facts used in not CEs. */
/* */
/* Added context information for run functions. */
/* */
/*************************************************************/
#define _ENGINE_SOURCE_
#include <stdio.h>
#define _STDIO_INCLUDED_
#include <string.h>
#include "setup.h"
#if DEFRULE_CONSTRUCT
#include "agenda.h"
#include "argacces.h"
#include "constant.h"
#include "envrnmnt.h"
#include "factmngr.h"
#include "inscom.h"
#include "memalloc.h"
#include "modulutl.h"
#include "prccode.h"
#include "prcdrfun.h"
#include "proflfun.h"
#include "reteutil.h"
#include "retract.h"
#include "router.h"
#include "ruledlt.h"
#include "sysdep.h"
#include "utility.h"
#include "watch.h"
#include "engine.h"
/***************************************/
/* LOCAL INTERNAL FUNCTION DEFINITIONS */
/***************************************/
static struct defmodule *RemoveFocus(void *,struct defmodule *);
static void DeallocateEngineData(void *);
/*****************************************************************************/
/* InitializeEngine: Initializes the activations and statistics watch items. */
/*****************************************************************************/
globle void InitializeEngine(
void *theEnv)
{
AllocateEnvironmentData(theEnv,ENGINE_DATA,sizeof(struct engineData),DeallocateEngineData);
EngineData(theEnv)->IncrementalResetFlag = TRUE;
#if DEBUGGING_FUNCTIONS
AddWatchItem(theEnv,"statistics",0,&EngineData(theEnv)->WatchStatistics,20,NULL,NULL);
AddWatchItem(theEnv,"focus",0,&EngineData(theEnv)->WatchFocus,0,NULL,NULL);
#endif
}
/*************************************************/
/* DeallocateEngineData: Deallocates environment */
/* data for engine functionality. */
/*************************************************/
static void DeallocateEngineData(
void *theEnv)
{
struct focus *tmpPtr, *nextPtr;
DeallocateCallList(theEnv,EngineData(theEnv)->ListOfRunFunctions);
DeallocateCallListWithArg(theEnv,EngineData(theEnv)->ListOfBeforeRunFunctions);
tmpPtr = EngineData(theEnv)->CurrentFocus;
while (tmpPtr != NULL)
{
nextPtr = tmpPtr->next;
rtn_struct(theEnv,focus,tmpPtr);
tmpPtr = nextPtr;
}
}
/**********************************************/
/* Run: C access routine for the run command. */
/**********************************************/
#if ALLOW_ENVIRONMENT_GLOBALS
globle long long Run(
long long runLimit)
{
return EnvRun(GetCurrentEnvironment(),runLimit);
}
#endif
/*************************************************/
/* EnvRun: C access routine for the run command. */
/*************************************************/
globle long long EnvRun(
void *theEnv,
long long runLimit)
{
long long rulesFired = 0;
DATA_OBJECT result;
struct callFunctionItemWithArg* theBeforeRunFunction;
struct callFunctionItem *theRunFunction;
#if DEBUGGING_FUNCTIONS
unsigned long maxActivations = 0, sumActivations = 0;
#if DEFTEMPLATE_CONSTRUCT
unsigned long maxFacts = 0, sumFacts = 0;
#endif
#if OBJECT_SYSTEM
unsigned long maxInstances = 0, sumInstances = 0;
#endif
double endTime, startTime = 0.0;
unsigned long tempValue;
#endif
unsigned short i;
struct patternEntity *theMatchingItem;
struct partialMatch *theBasis;
ACTIVATION *theActivation;
char *ruleFiring;
#if PROFILING_FUNCTIONS
struct profileFrameInfo profileFrame;
#endif
struct trackedMemory *theTM;
struct garbageFrame newGarbageFrame, *oldGarbageFrame;
/*=====================================================*/
/* Make sure the run command is not already executing. */
/*=====================================================*/
if (EngineData(theEnv)->AlreadyRunning) return(0);
EngineData(theEnv)->AlreadyRunning = TRUE;
/*========================================*/
/* Set up the frame for tracking garbage. */
/*========================================*/
oldGarbageFrame = UtilityData(theEnv)->CurrentGarbageFrame;
memset(&newGarbageFrame,0,sizeof(struct garbageFrame));
newGarbageFrame.priorFrame = oldGarbageFrame;
UtilityData(theEnv)->CurrentGarbageFrame = &newGarbageFrame;
/*================================*/
/* Set up statistics information. */
/*================================*/
#if DEBUGGING_FUNCTIONS
if (EngineData(theEnv)->WatchStatistics)
{
#if DEFTEMPLATE_CONSTRUCT
maxFacts = GetNumberOfFacts(theEnv);
sumFacts = maxFacts;
#endif
#if OBJECT_SYSTEM
maxInstances = GetGlobalNumberOfInstances(theEnv);
sumInstances = maxInstances;
#endif
maxActivations = GetNumberOfActivations(theEnv);
sumActivations = maxActivations;
startTime = gentime();
}
#endif
/*=============================*/
/* Set up execution variables. */
/*=============================*/
if (UtilityData(theEnv)->CurrentGarbageFrame->topLevel) SetHaltExecution(theEnv,FALSE);
EngineData(theEnv)->HaltRules = FALSE;
#if DEVELOPER
EngineData(theEnv)->leftToRightComparisons = 0;
EngineData(theEnv)->rightToLeftComparisons = 0;
EngineData(theEnv)->leftToRightSucceeds = 0;
EngineData(theEnv)->rightToLeftSucceeds = 0;
EngineData(theEnv)->leftToRightLoops = 0;
EngineData(theEnv)->rightToLeftLoops = 0;
EngineData(theEnv)->findNextConflictingComparisons = 0;
EngineData(theEnv)->betaHashListSkips = 0;
EngineData(theEnv)->betaHashHTSkips = 0;
EngineData(theEnv)->unneededMarkerCompare = 0;
#endif
/*=====================================================*/
/* Fire rules until the agenda is empty, the run limit */
/* has been reached, or a rule execution error occurs. */
/*=====================================================*/
theActivation = NextActivationToFire(theEnv);
while ((theActivation != NULL) &&
(runLimit != 0) &&
(EvaluationData(theEnv)->HaltExecution == FALSE) &&
(EngineData(theEnv)->HaltRules == FALSE))
{
/*========================================*/
/* Execute the list of functions that are */
/* to be called before each rule firing. */
/*========================================*/
for (theBeforeRunFunction = EngineData(theEnv)->ListOfBeforeRunFunctions;
theBeforeRunFunction != NULL;
theBeforeRunFunction = theBeforeRunFunction->next)
{
SetEnvironmentCallbackContext(theEnv,theBeforeRunFunction->context);
if (theBeforeRunFunction->environmentAware)
{ (*theBeforeRunFunction->func)(theEnv,theActivation); }
else
{ ((void (*)(void *))(*theBeforeRunFunction->func))(theActivation); }
}
/*===========================================*/
/* Detach the activation from the agenda and */
/* determine which rule is firing. */
/*===========================================*/
DetachActivation(theEnv,theActivation);
theTM = AddTrackedMemory(theEnv,theActivation,sizeof(struct activation));
ruleFiring = EnvGetActivationName(theEnv,theActivation);
theBasis = (struct partialMatch *) GetActivationBasis(theActivation);
EngineData(theEnv)->ExecutingRule = (struct defrule *) GetActivationRule(theActivation);
/*=============================================*/
/* Update the number of rules that have fired. */
/*=============================================*/
rulesFired++;
if (runLimit > 0) { runLimit--; }
/*==================================*/
/* If rules are being watched, then */
/* print an information message. */
/*==================================*/
#if DEBUGGING_FUNCTIONS
if (EngineData(theEnv)->ExecutingRule->watchFiring)
{
char printSpace[60];
gensprintf(printSpace,"FIRE %4lld ",rulesFired);
EnvPrintRouter(theEnv,WTRACE,printSpace);
EnvPrintRouter(theEnv,WTRACE,ruleFiring);
EnvPrintRouter(theEnv,WTRACE,": ");
PrintPartialMatch(theEnv,WTRACE,theBasis);
EnvPrintRouter(theEnv,WTRACE,"\n");
}
#endif
/*=================================================*/
/* Remove the link between the activation and the */
/* completed match for the rule. Set the busy flag */
/* for the completed match to TRUE (so the match */
/* upon which our RHS variables are dependent is */
/* not deleted while our rule is firing). Set up */
/* the global pointers to the completed match for */
/* routines which do variable extractions. */
/*=================================================*/
theBasis->marker = NULL;
theBasis->busy = TRUE;
EngineData(theEnv)->GlobalLHSBinds = theBasis;
EngineData(theEnv)->GlobalRHSBinds = NULL;
/*===================================================================*/
/* Increment the count for each of the facts/objects associated with */
/* the rule activation so that the facts/objects cannot be deleted */
/* by garbage collection while the rule is executing. */
/*===================================================================*/
for (i = 0; i < theBasis->bcount; i++)
{
if (theBasis->binds[i].gm.theMatch == NULL) continue;
theMatchingItem = theBasis->binds[i].gm.theMatch->matchingItem;
if (theMatchingItem != NULL)
{ (*theMatchingItem->theInfo->incrementBasisCount)(theEnv,theMatchingItem); }
}
/*====================================================*/
/* Execute the rule's right hand side actions. If the */
/* rule has logical CEs, set up the pointer to the */
/* rules logical join so the assert command will */
/* attach the appropriate dependencies to the facts. */
/*====================================================*/
EngineData(theEnv)->TheLogicalJoin = EngineData(theEnv)->ExecutingRule->logicalJoin;
if (EngineData(theEnv)->TheLogicalJoin != NULL)
{
EngineData(theEnv)->TheLogicalBind = FindLogicalBind(EngineData(theEnv)->TheLogicalJoin,EngineData(theEnv)->GlobalLHSBinds);
EngineData(theEnv)->TheLogicalBind->busy = TRUE;
}
else
{ EngineData(theEnv)->TheLogicalBind = NULL; }
EvaluationData(theEnv)->CurrentEvaluationDepth++;
SetEvaluationError(theEnv,FALSE);
EngineData(theEnv)->ExecutingRule->executing = TRUE;
#if PROFILING_FUNCTIONS
StartProfile(theEnv,&profileFrame,
&EngineData(theEnv)->ExecutingRule->header.usrData,
ProfileFunctionData(theEnv)->ProfileConstructs);
#endif
EvaluateProcActions(theEnv,EngineData(theEnv)->ExecutingRule->header.whichModule->theModule,
EngineData(theEnv)->ExecutingRule->actions,EngineData(theEnv)->ExecutingRule->localVarCnt,
&result,NULL);
#if PROFILING_FUNCTIONS
EndProfile(theEnv,&profileFrame);
#endif
EngineData(theEnv)->ExecutingRule->executing = FALSE;
SetEvaluationError(theEnv,FALSE);
EvaluationData(theEnv)->CurrentEvaluationDepth--;
EngineData(theEnv)->TheLogicalJoin = NULL;
if (EngineData(theEnv)->TheLogicalBind != NULL)
{
EngineData(theEnv)->TheLogicalBind->busy = FALSE;
EngineData(theEnv)->TheLogicalBind = NULL;
}
/*=====================================================*/
/* If rule execution was halted, then print a message. */
/*=====================================================*/
#if DEBUGGING_FUNCTIONS
if ((EvaluationData(theEnv)->HaltExecution) || (EngineData(theEnv)->HaltRules && EngineData(theEnv)->ExecutingRule->watchFiring))
#else
if ((EvaluationData(theEnv)->HaltExecution) || (EngineData(theEnv)->HaltRules))
#endif
{
PrintErrorID(theEnv,"PRCCODE",4,FALSE);
EnvPrintRouter(theEnv,WERROR,"Execution halted during the actions of defrule ");
EnvPrintRouter(theEnv,WERROR,ruleFiring);
EnvPrintRouter(theEnv,WERROR,".\n");
}
/*===================================================*/
/* Decrement the count for each of the facts/objects */
/* associated with the rule activation. */
/*===================================================*/
theBasis->busy = FALSE;
for (i = 0; i < (theBasis->bcount); i++)
{
if (theBasis->binds[i].gm.theMatch == NULL) continue;
theMatchingItem = theBasis->binds[i].gm.theMatch->matchingItem;
if (theMatchingItem != NULL)
{ (*theMatchingItem->theInfo->decrementBasisCount)(theEnv,theMatchingItem); }
}
/*========================================*/
/* Return the agenda node to free memory. */
/*========================================*/
RemoveTrackedMemory(theEnv,theTM);
RemoveActivation(theEnv,theActivation,FALSE,FALSE);
/*======================================*/
/* Get rid of partial matches discarded */
/* while executing the rule's RHS. */
/*======================================*/
FlushGarbagePartialMatches(theEnv);
/*==================================*/
/* Get rid of other garbage created */
/* while executing the rule's RHS. */
/*==================================*/
CleanCurrentGarbageFrame(theEnv,NULL);
CallPeriodicTasks(theEnv);
/*==========================*/
/* Keep up with statistics. */
/*==========================*/
#if DEBUGGING_FUNCTIONS
if (EngineData(theEnv)->WatchStatistics)
{
#if DEFTEMPLATE_CONSTRUCT
tempValue = GetNumberOfFacts(theEnv);
if (tempValue > maxFacts) maxFacts = tempValue;
sumFacts += tempValue;
#endif
#if OBJECT_SYSTEM
tempValue = GetGlobalNumberOfInstances(theEnv);
if (tempValue > maxInstances) maxInstances = tempValue;
sumInstances += tempValue;
#endif
tempValue = GetNumberOfActivations(theEnv);
if (tempValue > maxActivations) maxActivations = tempValue;
sumActivations += tempValue;
}
#endif
/*==================================*/
/* Update saliences if appropriate. */
/*==================================*/
if (EnvGetSalienceEvaluation(theEnv) == EVERY_CYCLE) EnvRefreshAgenda(theEnv,NULL);
/*========================================*/
/* Execute the list of functions that are */
/* to be called after each rule firing. */
/*========================================*/
for (theRunFunction = EngineData(theEnv)->ListOfRunFunctions;
theRunFunction != NULL;
theRunFunction = theRunFunction->next)
{
SetEnvironmentCallbackContext(theEnv,theRunFunction->context);
if (theRunFunction->environmentAware)
{ (*theRunFunction->func)(theEnv); }
else
{ ((void (*)(void))(*theRunFunction->func))(); }
}
/*========================================*/
/* If a return was issued on the RHS of a */
/* rule, then remove *that* rule's module */
/* from the focus stack */
/*========================================*/
if (ProcedureFunctionData(theEnv)->ReturnFlag == TRUE)
{ RemoveFocus(theEnv,EngineData(theEnv)->ExecutingRule->header.whichModule->theModule); }
ProcedureFunctionData(theEnv)->ReturnFlag = FALSE;
/*========================================*/
/* Determine the next activation to fire. */
/*========================================*/
theActivation = (struct activation *) NextActivationToFire(theEnv);
/*==============================*/
/* Check for a rule breakpoint. */
/*==============================*/
if (theActivation != NULL)
{
if (((struct defrule *) GetActivationRule(theActivation))->afterBreakpoint)
{
EngineData(theEnv)->HaltRules = TRUE;
EnvPrintRouter(theEnv,WDIALOG,"Breaking on rule ");
EnvPrintRouter(theEnv,WDIALOG,EnvGetActivationName(theEnv,theActivation));
EnvPrintRouter(theEnv,WDIALOG,".\n");
}
}
}
/*=====================================================*/
/* Make sure run functions are executed at least once. */
/*=====================================================*/
if (rulesFired == 0)
{
for (theRunFunction = EngineData(theEnv)->ListOfRunFunctions;
theRunFunction != NULL;
theRunFunction = theRunFunction->next)
{
if (theRunFunction->environmentAware)
{ (*theRunFunction->func)(theEnv); }
else
{ ((void (*)(void))(*theRunFunction->func))(); }
}
}
/*======================================================*/
/* If rule execution was halted because the rule firing */
/* limit was reached, then print a message. */
/*======================================================*/
if (runLimit == rulesFired)
{ EnvPrintRouter(theEnv,WDIALOG,"rule firing limit reached\n"); }
/*==============================*/
/* Restore execution variables. */
/*==============================*/
EngineData(theEnv)->ExecutingRule = NULL;
EngineData(theEnv)->HaltRules = FALSE;
/*=================================================*/
/* Print out statistics if they are being watched. */
/*=================================================*/
#if DEBUGGING_FUNCTIONS
if (EngineData(theEnv)->WatchStatistics)
{
char printSpace[60];
endTime = gentime();
PrintLongInteger(theEnv,WDIALOG,rulesFired);
EnvPrintRouter(theEnv,WDIALOG," rules fired");
#if (! GENERIC)
if (startTime != endTime)
{
EnvPrintRouter(theEnv,WDIALOG," Run time is ");
PrintFloat(theEnv,WDIALOG,endTime - startTime);
EnvPrintRouter(theEnv,WDIALOG," seconds.\n");
PrintFloat(theEnv,WDIALOG,(double) rulesFired / (endTime - startTime));
EnvPrintRouter(theEnv,WDIALOG," rules per second.\n");
}
else
{ EnvPrintRouter(theEnv,WDIALOG,"\n"); }
#else
EnvPrintRouter(theEnv, WDIALOG, "\n");
#endif
#if DEFTEMPLATE_CONSTRUCT
gensprintf(printSpace,"%ld mean number of facts (%ld maximum).\n",
(long) (((double) sumFacts / (rulesFired + 1)) + 0.5),
maxFacts);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
#endif
#if OBJECT_SYSTEM
gensprintf(printSpace,"%ld mean number of instances (%ld maximum).\n",
(long) (((double) sumInstances / (rulesFired + 1)) + 0.5),
maxInstances);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
#endif
gensprintf(printSpace,"%ld mean number of activations (%ld maximum).\n",
(long) (((double) sumActivations / (rulesFired + 1)) + 0.5),
maxActivations);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
#if DEVELOPER
gensprintf(printSpace,"%9ld left to right comparisons.\n",
EngineData(theEnv)->leftToRightComparisons);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld left to right succeeds.\n",
EngineData(theEnv)->leftToRightSucceeds);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld left to right loops.\n",
EngineData(theEnv)->leftToRightLoops);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld right to left comparisons.\n",
EngineData(theEnv)->rightToLeftComparisons);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld right to left succeeds.\n",
EngineData(theEnv)->rightToLeftSucceeds);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld right to left loops.\n",
EngineData(theEnv)->rightToLeftLoops);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld find next conflicting comparisons.\n",
EngineData(theEnv)->findNextConflictingComparisons);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld beta hash list skips.\n",
EngineData(theEnv)->betaHashListSkips);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld beta hash hash table skips.\n",
EngineData(theEnv)->betaHashHTSkips);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
gensprintf(printSpace,"%9ld unneeded marker compare.\n",
EngineData(theEnv)->unneededMarkerCompare);
EnvPrintRouter(theEnv,WDIALOG,printSpace);
#endif
}
#endif
/*==========================================*/
/* The current module should be the current */
/* focus when the run finishes. */
/*==========================================*/
if (EngineData(theEnv)->CurrentFocus != NULL)
{
if (EngineData(theEnv)->CurrentFocus->theModule != ((struct defmodule *) EnvGetCurrentModule(theEnv)))
{ EnvSetCurrentModule(theEnv,(void *) EngineData(theEnv)->CurrentFocus->theModule); }
}
/*================================*/
/* Restore the old garbage frame. */
/*================================*/
RestorePriorGarbageFrame(theEnv,&newGarbageFrame, oldGarbageFrame,NULL);
CallPeriodicTasks(theEnv);
/*===================================*/
/* Return the number of rules fired. */
/*===================================*/
EngineData(theEnv)->AlreadyRunning = FALSE;
return(rulesFired);
}
/***********************************************************/
/* NextActivationToFire: Returns the next activation which */
/* should be executed based on the current focus. */
/***********************************************************/
globle struct activation *NextActivationToFire(
void *theEnv)
{
struct activation *theActivation;
struct defmodule *theModule;
/*====================================*/
/* If there is no current focus, then */
/* focus on the MAIN module. */
/*====================================*/
if (EngineData(theEnv)->CurrentFocus == NULL)
{
theModule = (struct defmodule *) EnvFindDefmodule(theEnv,"MAIN");
EnvFocus(theEnv,theModule);
}
/*===========================================================*/
/* Determine the top activation on the agenda of the current */
/* focus. If the current focus has no activations on its */
/* agenda, then pop the focus off the focus stack until */
/* a focus that has an activation on its agenda is found. */
/*===========================================================*/
theActivation = EngineData(theEnv)->CurrentFocus->theDefruleModule->agenda;
while ((theActivation == NULL) && (EngineData(theEnv)->CurrentFocus != NULL))
{
if (EngineData(theEnv)->CurrentFocus != NULL) EnvPopFocus(theEnv);
if (EngineData(theEnv)->CurrentFocus != NULL) theActivation = EngineData(theEnv)->CurrentFocus->theDefruleModule->agenda;
}
/*=========================================*/
/* Return the next activation to be fired. */
/*=========================================*/
return(theActivation);
}
/***************************************************/
/* RemoveFocus: Removes the first occurence of the */
/* specified module from the focus stack. */
/***************************************************/
static struct defmodule *RemoveFocus(
void *theEnv,
struct defmodule *theModule)
{
struct focus *tempFocus,*prevFocus, *nextFocus;
int found = FALSE;
int currentFocusRemoved = FALSE;
/*====================================*/
/* Return NULL if there is nothing on */
/* the focus stack to remove. */
/*====================================*/
if (EngineData(theEnv)->CurrentFocus == NULL) return(NULL);
/*=============================================*/
/* Remove the first occurence of the specified */
/* module from the focus stack. */
/*=============================================*/
prevFocus = NULL;
tempFocus = EngineData(theEnv)->CurrentFocus;
while ((tempFocus != NULL) && (! found))
{
if (tempFocus->theModule == theModule)
{
found = TRUE;
nextFocus = tempFocus->next;
rtn_struct(theEnv,focus,tempFocus);
tempFocus = nextFocus;
if (prevFocus == NULL)
{
currentFocusRemoved = TRUE;
EngineData(theEnv)->CurrentFocus = tempFocus;
}
else
{ prevFocus->next = tempFocus; }
}
else
{
prevFocus = tempFocus;
tempFocus = tempFocus->next;
}
}
/*=========================================*/
/* If the given module is not in the focus */
/* stack, simply return the current focus */
/*=========================================*/
if (! found) return(EngineData(theEnv)->CurrentFocus->theModule);
/*========================================*/
/* If the current focus is being watched, */
/* then print an informational message. */
/*========================================*/
#if DEBUGGING_FUNCTIONS
if (EngineData(theEnv)->WatchFocus)
{
EnvPrintRouter(theEnv,WTRACE,"<== Focus ");
EnvPrintRouter(theEnv,WTRACE,ValueToString(theModule->name));
if ((EngineData(theEnv)->CurrentFocus != NULL) && currentFocusRemoved)
{
EnvPrintRouter(theEnv,WTRACE," to ");
EnvPrintRouter(theEnv,WTRACE,ValueToString(EngineData(theEnv)->CurrentFocus->theModule->name));
}
EnvPrintRouter(theEnv,WTRACE,"\n");
}
#endif
/*======================================================*/
/* Set the current module to the module associated with */
/* the current focus (if it changed) and set a boolean */
/* flag indicating that the focus has changed. */
/*======================================================*/
if ((EngineData(theEnv)->CurrentFocus != NULL) && currentFocusRemoved)
{ EnvSetCurrentModule(theEnv,(void *) EngineData(theEnv)->CurrentFocus->theModule); }
EngineData(theEnv)->FocusChanged = TRUE;
/*====================================*/
/* Return the module that was removed */
/* from the focus stack. */
/*====================================*/
return(theModule);
}
/*************************************************************/
/* EnvPopFocus: C access routine for the pop-focus function. */
/*************************************************************/
globle void *EnvPopFocus(
void *theEnv)
{
if (EngineData(theEnv)->CurrentFocus == NULL) return(NULL);
return((void *) RemoveFocus(theEnv,EngineData(theEnv)->CurrentFocus->theModule));
}
/***************************************************************/
/* EnvGetNextFocus: Returns the next focus on the focus stack. */
/***************************************************************/
globle void *EnvGetNextFocus(
void *theEnv,
void *theFocus)
{
/*==================================================*/
/* If NULL is passed as an argument, return the top */
/* focus on the focus stack (the current focus). */
/*==================================================*/
if (theFocus == NULL) return((void *) EngineData(theEnv)->CurrentFocus);
/*=======================================*/
/* Otherwise, return the focus following */
/* the focus passed as an argument. */
/*=======================================*/
return((void *) ((struct focus *) theFocus)->next);
}
/******************************************************/
/* EnvFocus: C access routine for the focus function. */
/******************************************************/
globle void EnvFocus(
void *theEnv,
void *vTheModule)
{
struct defmodule *theModule = (struct defmodule *) vTheModule;
struct focus *tempFocus;
/*==================================================*/
/* Make the specified module be the current module. */
/* If the specified module is the current focus, */
/* then no further action is needed. */
/*==================================================*/
EnvSetCurrentModule(theEnv,(void *) theModule);
if (EngineData(theEnv)->CurrentFocus != NULL)
{ if (EngineData(theEnv)->CurrentFocus->theModule == theModule) return; }
/*=====================================*/
/* If the focus is being watched, then */
/* print an information message. */
/*=====================================*/
#if DEBUGGING_FUNCTIONS
if (EngineData(theEnv)->WatchFocus)
{
EnvPrintRouter(theEnv,WTRACE,"==> Focus ");
EnvPrintRouter(theEnv,WTRACE,ValueToString(theModule->name));
if (EngineData(theEnv)->CurrentFocus != NULL)
{
EnvPrintRouter(theEnv,WTRACE," from ");
EnvPrintRouter(theEnv,WTRACE,ValueToString(EngineData(theEnv)->CurrentFocus->theModule->name));
}
EnvPrintRouter(theEnv,WTRACE,"\n");
}
#endif
/*=======================================*/
/* Add the new focus to the focus stack. */
/*=======================================*/
tempFocus = get_struct(theEnv,focus);
tempFocus->theModule = theModule;
tempFocus->theDefruleModule = GetDefruleModuleItem(theEnv,theModule);
tempFocus->next = EngineData(theEnv)->CurrentFocus;
EngineData(theEnv)->CurrentFocus = tempFocus;
EngineData(theEnv)->FocusChanged = TRUE;
}
/************************************************/
/* ClearFocusStackCommand: H/L access routine */
/* for the clear-focus-stack command. */
/************************************************/
globle void ClearFocusStackCommand(
void *theEnv)
{
if (EnvArgCountCheck(theEnv,"list-focus-stack",EXACTLY,0) == -1) return;
EnvClearFocusStack(theEnv);
}
/****************************************/
/* EnvClearFocusStack: C access routine */
/* for the clear-focus-stack command. */
/****************************************/
globle void EnvClearFocusStack(
void *theEnv)
{
while (EngineData(theEnv)->CurrentFocus != NULL) EnvPopFocus(theEnv);
EngineData(theEnv)->FocusChanged = TRUE;
}
#if ALLOW_ENVIRONMENT_GLOBALS
/***********************************/
/* AddRunFunction: Adds a function */
/* to the ListOfRunFunctions. */
/***********************************/
globle intBool AddRunFunction(
char *name,
void (*functionPtr)(void),
int priority)
{
void *theEnv;
theEnv = GetCurrentEnvironment();
EngineData(theEnv)->ListOfRunFunctions =
AddFunctionToCallList(theEnv,name,priority,(void (*)(void *)) functionPtr,
EngineData(theEnv)->ListOfRunFunctions,TRUE);
return(1);
}
/*****************************************/
/* AddBeforeRunFunction: Adds a function */
/* to the ListOfBeforeRunFunctions. */
/*****************************************/
globle intBool AddBeforeRunFunction(
char *name,
void (*functionPtr)(void *),
int priority)
{
void *theEnv;
theEnv = GetCurrentEnvironment();
EngineData(theEnv)->ListOfBeforeRunFunctions =
AddFunctionToCallListWithArg(theEnv,name,priority,(void (*)(void *,void *)) functionPtr,
EngineData(theEnv)->ListOfBeforeRunFunctions,TRUE);
return(1);
}
#endif
/**************************************/
/* EnvAddRunFunction: Adds a function */
/* to the ListOfRunFunctions. */
/**************************************/
globle intBool EnvAddRunFunction(
void *theEnv,
char *name,
void (*functionPtr)(void *),
int priority)
{
EngineData(theEnv)->ListOfRunFunctions = AddFunctionToCallList(theEnv,name,priority,
functionPtr,
EngineData(theEnv)->ListOfRunFunctions,TRUE);
return(1);
}
/********************************************/
/* EnvAddBeforeRunFunction: Adds a function */
/* to the ListOfBeforeRunFunctions. */
/********************************************/
globle intBool EnvAddBeforeRunFunction(
void *theEnv,
char *name,
void (*functionPtr)(void *, void *),
int priority) {
EngineData(theEnv)->ListOfBeforeRunFunctions = AddFunctionToCallListWithArg(theEnv,name,priority,
functionPtr,
EngineData(theEnv)->ListOfBeforeRunFunctions,TRUE);
return(1);
}
/*****************************************/
/* EnvAddRunFunctionWithContext: Adds a */
/* function to the ListOfRunFunctions. */
/*****************************************/
globle intBool EnvAddRunFunctionWithContext(
void *theEnv,
char *name,
void (*functionPtr)(void *),
int priority,
void *context)
{
EngineData(theEnv)->ListOfRunFunctions =
AddFunctionToCallListWithContext(theEnv,name,priority,functionPtr,
EngineData(theEnv)->ListOfRunFunctions,
TRUE,context);
return(1);
}
/***********************************************/
/* EnvAddBeforeRunFunctionWithContext: Adds a */
/* function to the ListOfBeforeRunFunctions. */
/***********************************************/
globle intBool EnvAddBeforeRunFunctionWithContext(
void *theEnv,
char *name,
void (*functionPtr)(void *, void *),
int priority,
void *context)
{
EngineData(theEnv)->ListOfBeforeRunFunctions =
AddFunctionToCallListWithArgWithContext(theEnv,name,priority,functionPtr,
EngineData(theEnv)->ListOfBeforeRunFunctions,
TRUE,context);
return(1);
}
/********************************************/
/* EnvRemoveRunFunction: Removes a function */
/* from the ListOfRunFunctions. */
/********************************************/
globle intBool EnvRemoveRunFunction(