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/*******************************************************/
/* "C" Language Integrated Production System */
/* */
/* CLIPS Version 6.40 07/30/16 */
/* */
/* DEFTEMPLATE LHS MODULE */
/*******************************************************/
/*************************************************************/
/* Purpose: Parses LHS deftemplate patterns. */
/* */
/* Principal Programmer(s): */
/* Gary D. Riley */
/* */
/* Contributing Programmer(s): */
/* */
/* Revision History: */
/* */
/* 6.24: Renamed BOOLEAN macro type to intBool. */
/* */
/* 6.30: Support for rete network exists node. */
/* */
/* Added const qualifiers to remove C++ */
/* deprecation warnings. */
/* */
/* 6.40: Pragma once and other inclusion changes. */
/* */
/* Added support for booleans with <stdbool.h>. */
/* */
/* Removed use of void pointers for specific */
/* data structures. */
/* */
/*************************************************************/
#include "setup.h"
#if DEFTEMPLATE_CONSTRUCT && DEFRULE_CONSTRUCT && (! RUN_TIME) && (! BLOAD_ONLY)
#include <stdio.h>
#include <string.h>
#include "constant.h"
#include "constrct.h"
#include "constrnt.h"
#include "envrnmnt.h"
#include "exprnpsr.h"
#include "factrhs.h"
#include "memalloc.h"
#include "modulutl.h"
#include "pattern.h"
#include "pprint.h"
#include "prntutil.h"
#include "reorder.h"
#include "router.h"
#include "scanner.h"
#include "symbol.h"
#include "tmpltdef.h"
#include "tmpltutl.h"
#include "tmpltlhs.h"
/***************************************/
/* LOCAL INTERNAL FUNCTION DEFINITIONS */
/***************************************/
static struct lhsParseNode *GetLHSSlots(Environment *,const char *,struct token *,Deftemplate *,bool *);
static struct lhsParseNode *GetSingleLHSSlot(Environment *,const char *,struct token *,
struct templateSlot *,bool *,unsigned short);
static bool MultiplyDefinedLHSSlots(Environment *,struct lhsParseNode *,CLIPSLexeme *);
/*********************************************/
/* DeftemplateLHSParse: Parses a LHS pattern */
/* that uses the deftemplate format. */
/*********************************************/
struct lhsParseNode *DeftemplateLHSParse(
Environment *theEnv,
const char *readSource,
Deftemplate *theDeftemplate)
{
struct lhsParseNode *head, *firstSlot;
struct token theToken;
bool error;
/*===============================================================*/
/* Make sure the deftemplate name is not connected to subfields. */
/*===============================================================*/
GetToken(theEnv,readSource,&theToken);
if ((theToken.tknType == OR_CONSTRAINT_TOKEN) ||
(theToken.tknType == AND_CONSTRAINT_TOKEN))
{
SyntaxErrorMessage(theEnv,"deftemplate patterns");
return NULL;
}
/*===================================================*/
/* Create the pattern node for the deftemplate name. */
/*===================================================*/
head = GetLHSParseNode(theEnv);
head->pnType = SF_WILDCARD_NODE;
head->negated = false;
head->exists = false;
head->index = 0;
head->slotNumber = 1;
head->bottom = GetLHSParseNode(theEnv);
head->bottom->pnType = SYMBOL_NODE;
head->bottom->negated = false;
head->bottom->exists = false;
head->bottom->value = theDeftemplate->header.name;
/*==========================================*/
/* Get the other fields in the deftemplate. */
/*==========================================*/
error = false;
firstSlot = GetLHSSlots(theEnv,readSource,&theToken,theDeftemplate,&error);
if (error)
{
ReturnLHSParseNodes(theEnv,firstSlot);
ReturnLHSParseNodes(theEnv,head);
return NULL;
}
/*=========================*/
/* Return the LHS pattern. */
/*=========================*/
head->right = firstSlot;
return(head);
}
/******************************************/
/* GetLHSSlots: Retrieves all of the slot */
/* values used in a LHS pattern. */
/******************************************/
static struct lhsParseNode *GetLHSSlots(
Environment *theEnv,
const char *readSource,
struct token *tempToken,
Deftemplate *theDeftemplate,
bool *error)
{
struct lhsParseNode *firstSlot = NULL, *nextSlot, *lastSlot = NULL;
struct templateSlot *slotPtr;
unsigned short position;
/*=======================================================*/
/* Continue parsing slot definitions until the pattern's */
/* closing right parenthesis is encountered. */
/*=======================================================*/
while (tempToken->tknType != RIGHT_PARENTHESIS_TOKEN)
{
PPBackup(theEnv);
SavePPBuffer(theEnv," ");
SavePPBuffer(theEnv,tempToken->printForm);
/*=================================================*/
/* Slot definitions begin with a left parenthesis. */
/*=================================================*/
if (tempToken->tknType != LEFT_PARENTHESIS_TOKEN)
{
*error = true;
SyntaxErrorMessage(theEnv,"deftemplate patterns");
ReturnLHSParseNodes(theEnv,firstSlot);
return NULL;
}
/*====================*/
/* Get the slot name. */
/*====================*/
GetToken(theEnv,readSource,tempToken);
if (tempToken->tknType != SYMBOL_TOKEN)
{
*error = true;
SyntaxErrorMessage(theEnv,"deftemplate patterns");
ReturnLHSParseNodes(theEnv,firstSlot);
return NULL;
}
/*==========================================================*/
/* Determine if the slot name is valid for the deftemplate. */
/*==========================================================*/
if ((slotPtr = FindSlot(theDeftemplate,tempToken->lexemeValue,&position)) == NULL)
{
*error = true;
InvalidDeftemplateSlotMessage(theEnv,tempToken->lexemeValue->contents,
theDeftemplate->header.name->contents,true);
ReturnLHSParseNodes(theEnv,firstSlot);
return NULL;
}
/*============================================*/
/* Determine if the slot is multiply defined. */
/*============================================*/
if (MultiplyDefinedLHSSlots(theEnv,firstSlot,tempToken->lexemeValue) == true)
{
*error = true;
ReturnLHSParseNodes(theEnv,firstSlot);
return NULL;
}
/*==============================================================*/
/* Get the pattern matching values used in the slot definition. */
/*==============================================================*/
nextSlot = GetSingleLHSSlot(theEnv,readSource,tempToken,slotPtr,error,position+1);
if (*error)
{
ReturnLHSParseNodes(theEnv,firstSlot);
ReturnLHSParseNodes(theEnv,nextSlot);
return NULL;
}
/*=====================================*/
/* Add the slot definition to the list */
/* of slot definitions already parsed. */
/*=====================================*/
if (lastSlot == NULL)
{ firstSlot = nextSlot; }
else
{ lastSlot->right = nextSlot; }
while (nextSlot->right != NULL) nextSlot = nextSlot->right;
lastSlot = nextSlot;
/*==============================*/
/* Begin parsing the next slot. */
/*==============================*/
GetToken(theEnv,readSource,tempToken);
}
/*===========================================================*/
/* Return all the slot definitions found in the lhs pattern. */
/*===========================================================*/
return(firstSlot);
}
/*****************************************************/
/* GetSingleLHSSlot: Get the pattern matching values */
/* to be associated with a slot name. */
/*****************************************************/
static struct lhsParseNode *GetSingleLHSSlot(
Environment *theEnv,
const char *readSource,
struct token *tempToken,
struct templateSlot *slotPtr,
bool *error,
unsigned short position)
{
struct lhsParseNode *nextSlot;
CLIPSLexeme *slotName;
/*================================================*/
/* Get the slot name and read in the first token. */
/*================================================*/
slotName = tempToken->lexemeValue;
SavePPBuffer(theEnv," ");
GetToken(theEnv,readSource,tempToken);
/*====================================*/
/* Get value for a single field slot. */
/*====================================*/
if (slotPtr->multislot == false)
{
/*=======================*/
/* Get the single value. */
/*=======================*/
nextSlot = RestrictionParse(theEnv,readSource,tempToken,false,
slotPtr->slotName,position,
slotPtr->constraints,0);
if (nextSlot == NULL)
{
*error = true;
return NULL;
}
/*======================================*/
/* Multi field wildcards and variables */
/* not allowed in a single field slot. */
/*======================================*/
if ((nextSlot->pnType == MF_VARIABLE_NODE) ||
(nextSlot->pnType == MF_WILDCARD_NODE))
{
SingleFieldSlotCardinalityError(theEnv,slotPtr->slotName->contents);
*error = true;
ReturnLHSParseNodes(theEnv,nextSlot);
return NULL;
}
}
/*===================================*/
/* Get values for a multifield slot. */
/*===================================*/
else
{
nextSlot = RestrictionParse(theEnv,readSource,tempToken,true,slotName,position,
slotPtr->constraints,1);
if (nextSlot == NULL)
{
*error = true;
return NULL;
}
}
/*========================================================*/
/* The slot definition must end with a right parenthesis. */
/*========================================================*/
if (tempToken->tknType != RIGHT_PARENTHESIS_TOKEN)
{
PPBackup(theEnv);
SavePPBuffer(theEnv," ");
SavePPBuffer(theEnv,tempToken->printForm);
SyntaxErrorMessage(theEnv,"deftemplate patterns");
*error = true;
ReturnLHSParseNodes(theEnv,nextSlot);
return NULL;
}
/*===============================================*/
/* Fix the pretty print output if the multifield */
/* slot contained no restrictions. */
/*===============================================*/
if ((nextSlot->bottom == NULL) && slotPtr->multislot)
{
PPBackup(theEnv);
PPBackup(theEnv);
SavePPBuffer(theEnv,")");
}
/*=================================*/
/* Add the slot values to the slot */
/* structure and return it. */
/*=================================*/
return(nextSlot);
}
/******************************************************/
/* MultiplyDefinedLHSSlots: Determines if a slot name */
/* was used more than once in a LHS pattern. */
/******************************************************/
static bool MultiplyDefinedLHSSlots(
Environment *theEnv,
struct lhsParseNode *theSlots,
CLIPSLexeme *slotName)
{
for (;
theSlots != NULL;
theSlots = theSlots->right)
{
if (theSlots->slot == slotName)
{
AlreadyParsedErrorMessage(theEnv,"slot ",slotName->contents);
return true;
}
}
return false;
}
#endif /* DEFTEMPLATE_CONSTRUCT && DEFRULE_CONSTRUCT && (! RUN_TIME) && (! BLOAD_ONLY) */