globle struct expr *GetRHSPattern(
char *readSource,
struct token *tempToken,
int *error,
int constantsOnly,
int readFirstParen,
int checkFirstParen,
int endType)
{
struct expr *lastOne = NULL;
struct expr *nextOne, *firstOne, *argHead = NULL;
int printError, count;
struct deftemplate *theDeftemplate;
struct symbolHashNode *templateName;
/*=================================================*/
/* Get the opening parenthesis of the RHS pattern. */
/*=================================================*/
*error = FALSE;
if (readFirstParen) GetToken(readSource,tempToken);
if (checkFirstParen)
{
if (tempToken->type == endType) return(NULL);
if (tempToken->type != LPAREN)
{
SyntaxErrorMessage("RHS patterns");
*error = TRUE;
return(NULL);
}
}
/*======================================================*/
/* The first field of an asserted fact must be a symbol */
/* (but not = or : which have special significance). */
/*======================================================*/
GetToken(readSource,tempToken);
if (tempToken->type != SYMBOL)
{
SyntaxErrorMessage("first field of a RHS pattern");
*error = TRUE;
return(NULL);
}
else if ((strcmp(ValueToString(tempToken->value),"=") == 0) ||
(strcmp(ValueToString(tempToken->value),":") == 0))
{
SyntaxErrorMessage("first field of a RHS pattern");
*error = TRUE;
return(NULL);
}
/*=========================================================*/
/* Check to see if the relation name is a reserved symbol. */
/*=========================================================*/
templateName = (struct symbolHashNode *) tempToken->value;
if (ReservedPatternSymbol(ValueToString(templateName),NULL))
{
ReservedPatternSymbolErrorMsg(ValueToString(templateName),"a relation name");
*error = TRUE;
return(NULL);
}
/*============================================================*/
/* A module separator in the name is illegal in this context. */
/*============================================================*/
if (FindModuleSeparator(ValueToString(templateName)))
{
IllegalModuleSpecifierMessage();
*error = TRUE;
return(NULL);
}
/*=============================================================*/
/* Determine if there is an associated deftemplate. If so, let */
/* the deftemplate parsing functions parse the RHS pattern and */
/* then return the fact pattern that was parsed. */
/*=============================================================*/
theDeftemplate = (struct deftemplate *)
FindImportedConstruct("deftemplate",NULL,ValueToString(templateName),
&count,TRUE,NULL);
if (count > 1)
{
AmbiguousReferenceErrorMessage("deftemplate",ValueToString(templateName));
*error = TRUE;
return(NULL);
}
/*======================================================*/
/* If no deftemplate exists with the specified relation */
/* name, then create an implied deftemplate. */
/*======================================================*/
if (theDeftemplate == NULL)
#if (! BLOAD_ONLY) && (! RUN_TIME)
{
#if BLOAD || BLOAD_AND_BSAVE
if ((Bloaded()) && (! CheckSyntaxMode))
{
NoSuchTemplateError(ValueToString(templateName));
*error = TRUE;
return(NULL);
}
#endif
#if DEFMODULE_CONSTRUCT
if (FindImportExportConflict("deftemplate",((struct defmodule *) GetCurrentModule()),ValueToString(templateName)))
{
ImportExportConflictMessage("implied deftemplate",ValueToString(templateName),NULL,NULL);
*error = TRUE;
return(NULL);
}
#endif
if (! CheckSyntaxMode)
{ theDeftemplate = CreateImpliedDeftemplate((SYMBOL_HN *) templateName,TRUE); }
}
#else
{
NoSuchTemplateError(ValueToString(templateName));
*error = TRUE;
return(NULL);
}
#endif
/*=========================================*/
/* If an explicit deftemplate exists, then */
/* parse the fact as a deftemplate fact. */
/*=========================================*/
if ((theDeftemplate != NULL) && (theDeftemplate->implied == FALSE))
{
firstOne = GenConstant(DEFTEMPLATE_PTR,theDeftemplate);
firstOne->nextArg = ParseAssertTemplate(readSource,tempToken,
error,endType,
constantsOnly,theDeftemplate);
if (*error)
{
ReturnExpression(firstOne);
firstOne = NULL;
}
return(firstOne);
}
/*========================================*/
/* Parse the fact as an ordered RHS fact. */
/*========================================*/
firstOne = GenConstant(DEFTEMPLATE_PTR,theDeftemplate);
#if (! RUN_TIME) && (! BLOAD_ONLY)
SavePPBuffer(" ");
#endif
while ((nextOne = GetAssertArgument(readSource,tempToken,
error,endType,constantsOnly,&printError)) != NULL)
{
if (argHead == NULL) argHead = nextOne;
else lastOne->nextArg = nextOne;
lastOne = nextOne;
#if (! RUN_TIME) && (! BLOAD_ONLY)
SavePPBuffer(" ");
#endif
}
/*===========================================================*/
/* If an error occurred, set the error flag and return NULL. */
/*===========================================================*/
if (*error)
{
if (printError) SyntaxErrorMessage("RHS patterns");
ReturnExpression(firstOne);
ReturnExpression(argHead);
return(NULL);
}
/*=====================================*/
/* Fix the pretty print representation */
/* of the RHS ordered fact. */
/*=====================================*/
#if (! RUN_TIME) && (! BLOAD_ONLY)
PPBackup();
PPBackup();
SavePPBuffer(tempToken->printForm);
#endif
/*==========================================================*/
/* Ordered fact assertions are processed by stuffing all of */
/* the fact's proposition (except the relation name) into a */
/* single multifield slot. */
/*==========================================================*/
firstOne->nextArg = GenConstant(FACT_STORE_MULTIFIELD,AddBitMap("\0",1));
firstOne->nextArg->argList = argHead;
/*==============================*/
/* Return the RHS ordered fact. */
/*==============================*/
return(firstOne);
}
static struct expr *ParseAssertSlotValues(
char *inputSource,
struct token *tempToken,
struct templateSlot *slotPtr,
int *error,
int constantsOnly)
{
struct expr *nextSlot;
struct expr *newField, *valueList, *lastValue;
int printError;
/*=============================*/
/* Handle a single field slot. */
/*=============================*/
if (slotPtr->multislot == FALSE)
{
/*=====================*/
/* Get the slot value. */
/*=====================*/
SavePPBuffer(" ");
newField = GetAssertArgument(inputSource,tempToken,
error,RPAREN,constantsOnly,&printError);
if (*error)
{
if (printError) SyntaxErrorMessage("deftemplate pattern");
return(NULL);
}
/*=================================================*/
/* A single field slot value must contain a value. */
/* Only a multifield slot can be empty. */
/*=================================================*/
if (newField == NULL)
{
*error = TRUE;
SingleFieldSlotCardinalityError(slotPtr->slotName->contents);
return(NULL);
}
/*==============================================*/
/* A function returning a multifield value can */
/* not be called to get the value for the slot. */
/*==============================================*/
if ((newField->type == FCALL) ? (ExpressionFunctionType(newField) == 'm') :
(newField->type == MF_VARIABLE))
{
*error = TRUE;
SingleFieldSlotCardinalityError(slotPtr->slotName->contents);
ReturnExpression(newField);
return(NULL);
}
/*============================*/
/* Move on to the next token. */
/*============================*/
GetToken(inputSource,tempToken);
}
/*========================================*/
/* Handle a multifield slot. Build a list */
/* of the values stored in the slot. */
/*========================================*/
else
{
SavePPBuffer(" ");
valueList = GetAssertArgument(inputSource,tempToken,
error,RPAREN,constantsOnly,&printError);
if (*error)
{
if (printError) SyntaxErrorMessage("deftemplate pattern");
return(NULL);
}
if (valueList == NULL)
{
PPBackup();
PPBackup();
SavePPBuffer(")");
}
lastValue = valueList;
while (lastValue != NULL) /* (tempToken->type != RPAREN) */
{
if (tempToken->type == RPAREN)
{ SavePPBuffer(" "); }
else
{
/* PPBackup(); */
SavePPBuffer(" ");
/* SavePPBuffer(tempToken->printForm); */
}
newField = GetAssertArgument(inputSource,tempToken,error,RPAREN,constantsOnly,&printError);
if (*error)
{
if (printError) SyntaxErrorMessage("deftemplate pattern");
ReturnExpression(valueList);
return(NULL);
}
if (newField == NULL)
{
PPBackup();
PPBackup();
SavePPBuffer(")");
}
lastValue->nextArg = newField;
lastValue = newField;
}
newField = valueList;
}
/*==========================================================*/
/* Slot definition must be closed with a right parenthesis. */
/*==========================================================*/
if (tempToken->type != RPAREN)
{
SingleFieldSlotCardinalityError(slotPtr->slotName->contents);
*error = TRUE;
ReturnExpression(newField);
return(NULL);
}
/*=========================================================*/
/* Build and return a structure describing the slot value. */
/*=========================================================*/
nextSlot = GenConstant(SYMBOL,slotPtr->slotName);
nextSlot->argList = newField;
return(nextSlot);
}
static struct expr *ModAndDupParse(
void *theEnv,
struct expr *top,
char *logicalName,
char *name)
{
int error = FALSE;
struct token theToken;
struct expr *nextOne, *tempSlot;
struct expr *newField, *firstField, *lastField;
int printError;
short done;
/*==================================================================*/
/* Parse the fact-address or index to the modify/duplicate command. */
/*==================================================================*/
SavePPBuffer(theEnv," ");
GetToken(theEnv,logicalName,&theToken);
if ((theToken.type == SF_VARIABLE) || (theToken.type == GBL_VARIABLE))
{ nextOne = GenConstant(theEnv,theToken.type,theToken.value); }
else if (theToken.type == INTEGER)
{
if (! TopLevelCommand(theEnv))
{
PrintErrorID(theEnv,"TMPLTFUN",1,TRUE);
EnvPrintRouter(theEnv,WERROR,"Fact-indexes can only be used by ");
EnvPrintRouter(theEnv,WERROR,name);
EnvPrintRouter(theEnv,WERROR," as a top level command.\n");
ReturnExpression(theEnv,top);
return(NULL);
}
nextOne = GenConstant(theEnv,INTEGER,theToken.value);
}
else
{
ExpectedTypeError2(theEnv,name,1);
ReturnExpression(theEnv,top);
return(NULL);
}
nextOne->nextArg = NULL;
nextOne->argList = NULL;
top->argList = nextOne;
nextOne = top->argList;
/*=======================================================*/
/* Parse the remaining modify/duplicate slot specifiers. */
/*=======================================================*/
GetToken(theEnv,logicalName,&theToken);
while (theToken.type != RPAREN)
{
PPBackup(theEnv);
SavePPBuffer(theEnv," ");
SavePPBuffer(theEnv,theToken.printForm);
/*=================================================*/
/* Slot definition begins with a left parenthesis. */
/*=================================================*/
if (theToken.type != LPAREN)
{
SyntaxErrorMessage(theEnv,"duplicate/modify function");
ReturnExpression(theEnv,top);
return(NULL);
}
/*=================================*/
/* The slot name must be a symbol. */
/*=================================*/
GetToken(theEnv,logicalName,&theToken);
if (theToken.type != SYMBOL)
{
SyntaxErrorMessage(theEnv,"duplicate/modify function");
ReturnExpression(theEnv,top);
return(NULL);
}
/*=================================*/
/* Check for duplicate slot names. */
/*=================================*/
for (tempSlot = top->argList->nextArg;
tempSlot != NULL;
tempSlot = tempSlot->nextArg)
{
if (tempSlot->value == theToken.value)
{
AlreadyParsedErrorMessage(theEnv,"slot ",ValueToString(theToken.value));
ReturnExpression(theEnv,top);
return(NULL);
}
}
/*=========================================*/
/* Add the slot name to the list of slots. */
/*=========================================*/
nextOne->nextArg = GenConstant(theEnv,SYMBOL,theToken.value);
nextOne = nextOne->nextArg;
/*====================================================*/
/* Get the values to be stored in the specified slot. */
/*====================================================*/
firstField = NULL;
lastField = NULL;
done = FALSE;
while (! done)
{
SavePPBuffer(theEnv," ");
newField = GetAssertArgument(theEnv,logicalName,&theToken,&error,
RPAREN,FALSE,&printError);
if (error)
{
if (printError) SyntaxErrorMessage(theEnv,"deftemplate pattern");
ReturnExpression(theEnv,top);
return(NULL);
}
if (newField == NULL)
{ done = TRUE; }
if (lastField == NULL)
{ firstField = newField; }
else
{ lastField->nextArg = newField; }
lastField = newField;
}
/*================================================*/
/* Slot definition ends with a right parenthesis. */
/*================================================*/
if (theToken.type != RPAREN)
{
SyntaxErrorMessage(theEnv,"duplicate/modify function");
ReturnExpression(theEnv,top);
ReturnExpression(theEnv,firstField);
return(NULL);
}
else
{
PPBackup(theEnv);
PPBackup(theEnv);
SavePPBuffer(theEnv,")");
}
nextOne->argList = firstField;
GetToken(theEnv,logicalName,&theToken);
}
/*================================================*/
/* Return the parsed modify/duplicate expression. */
/*================================================*/
return(top);
}
globle struct expr *GetRHSPattern(
char *readSource,
struct token *tempToken,
int *error,
int constantsOnly,
int readFirstParen,
int checkFirstParen,
int endType)
{
struct expr *lastOne = NULL;
struct expr *nextOne, *firstOne, *argHead = NULL;
int printError, count;
struct deftemplate *theDeftemplate;
struct symbolHashNode *templateName;
/*=================================================*/
/* Get the opening parenthesis of the RHS pattern. */
/*=================================================*/
*error = FALSE;
if (readFirstParen) GetToken(readSource,tempToken);
if (checkFirstParen)
{
if (tempToken->type == endType) return(NULL);
if (tempToken->type != LPAREN)
{
SyntaxErrorMessage("RHS patterns");
*error = TRUE;
return(NULL);
}
}
/*======================================================*/
/* The first field of an asserted fact must be a symbol */
/* (but not = or : which have special significance). */
/*======================================================*/
GetToken(readSource,tempToken);
if (tempToken->type != SYMBOL)
{
SyntaxErrorMessage("first field of a RHS pattern");
*error = TRUE;
return(NULL);
}
else if ((strcmp(ValueToString(tempToken->value),"=") == 0) ||
(strcmp(ValueToString(tempToken->value),":") == 0))
{
SyntaxErrorMessage("first field of a RHS pattern");
*error = TRUE;
return(NULL);
}
/*=========================================================*/
/* Check to see if the relation name is a reserved symbol. */
/*=========================================================*/
templateName = (struct symbolHashNode *) tempToken->value;
if (ReservedPatternSymbol(ValueToString(templateName),NULL))
{
ReservedPatternSymbolErrorMsg(ValueToString(templateName),"a relation name");
*error = TRUE;
return(NULL);
}
/*============================================================*/
/* A module separator in the name is illegal in this context. */
/*============================================================*/
if (FindModuleSeparator(ValueToString(templateName)))
{
IllegalModuleSpecifierMessage();
*error = TRUE;
return(NULL);
}
/*=============================================================*/
/* Determine if there is an associated deftemplate. If so, let */
/* the deftemplate parsing functions parse the RHS pattern and */
/* then return the fact pattern that was parsed. */
/*=============================================================*/
theDeftemplate = (struct deftemplate *)
FindImportedConstruct("deftemplate",NULL,ValueToString(templateName),
&count,TRUE,NULL);
if (count > 1)
{
AmbiguousReferenceErrorMessage("deftemplate",ValueToString(templateName));
*error = TRUE;
return(NULL);
}
/*======================================================*/
/* If no deftemplate exists with the specified relation */
/* name, then create an implied deftemplate. */
/*======================================================*/
if (theDeftemplate == NULL)
#if (! BLOAD_ONLY) && (! RUN_TIME)
{
#if BLOAD || BLOAD_AND_BSAVE
if ((Bloaded()) && (! CheckSyntaxMode))
{
NoSuchTemplateError(ValueToString(templateName));
*error = TRUE;
return(NULL);
}
#endif
#if DEFMODULE_CONSTRUCT
if (FindImportExportConflict("deftemplate",((struct defmodule *) GetCurrentModule()),ValueToString(templateName)))
{
ImportExportConflictMessage("implied deftemplate",ValueToString(templateName),NULL,NULL);
*error = TRUE;
return(NULL);
}
#endif
if (! CheckSyntaxMode)
{ theDeftemplate = CreateImpliedDeftemplate((SYMBOL_HN *) templateName,TRUE); }
}
#else
{
NoSuchTemplateError(ValueToString(templateName));
*error = TRUE;
return(NULL);
}
#endif
/*=========================================*/
/* If an explicit deftemplate exists, then */
/* parse the fact as a deftemplate fact. */
/*=========================================*/
if ((theDeftemplate != NULL) && (theDeftemplate->implied == FALSE))
{
firstOne = GenConstant(DEFTEMPLATE_PTR,theDeftemplate);
#if FUZZY_DEFTEMPLATES
if (theDeftemplate->fuzzyTemplate != NULL)
firstOne->nextArg = ParseAssertFuzzyFact(readSource,tempToken,
error,endType,
constantsOnly,theDeftemplate,
TRUE);
else
#endif
firstOne->nextArg = ParseAssertTemplate(readSource,tempToken,
error,endType,
constantsOnly,theDeftemplate);
if (*error)
{
ReturnExpression(firstOne);
firstOne = NULL;
}
#if CERTAINTY_FACTORS
else
{
/* if certaintly factors allowed then the next item after a fact
specifier COULD be a certainty factor spec --- CF x.xxx
*/
SavePPBuffer(" ");
GetToken(readSource,tempToken);
if ((tempToken->type == SYMBOL) &&
((strcmp(ValueToString(tempToken->value),"CF") == 0) ||
(strcmp(ValueToString(tempToken->value),"cf") == 0))
)
{
struct expr *CFexpr;
/* expecting a certainty factor (float) expression */
/* tokenToFloatExpression expect 1st token already read */
SavePPBuffer(" ");
GetToken(readSource,tempToken);
CFexpr = tokenToFloatExpression(readSource,tempToken,error,constantsOnly);
if (*error)
{
ReturnExpression(firstOne);
return( NULL );
}
if (CFexpr->type == FLOAT) /* if constant -- check range */
{
double cfval = ValueToDouble(CFexpr->value);
if (cfval > 1.0 || cfval < 0.0)
{
*error = TRUE;
ReturnExpression(CFexpr);
cfRangeError();
ReturnExpression(firstOne);
return( NULL );
}
}
/* store the CF expression in the argList of the DEFTEMPLATE_PTR expr */
firstOne->argList = CFexpr;
}
else
{
/* Do an 'UnGetToken' function here to undo the lookahead for a CF.
Also need to PPBackup over the space added before reading the
potential CF expression -- UnGetToken does one PPBackup over the
token which was added to the PP Buffer
*/
UnGetToken(tempToken);
PPBackup();
}
}
#endif
return(firstOne);
}
/*========================================*/
/* Parse the fact as an ordered RHS fact. */
/*========================================*/
firstOne = GenConstant(DEFTEMPLATE_PTR,theDeftemplate);
#if FUZZY_DEFTEMPLATES
/*=============================================*/
/* Fuzzy facts parsed differently */
/*=============================================*/
if (theDeftemplate->fuzzyTemplate != NULL)
{
firstOne->nextArg = ParseAssertFuzzyFact(readSource,tempToken,
error,endType,
constantsOnly,theDeftemplate,
TRUE);
if (*error)
{
ReturnExpression(firstOne);
return(NULL);
}
}
else
{ /* --- matches } below with FUZZY_DEFTEMPLATES */
#endif /* FUZZY_DEFTEMPLATES */
#if (! RUN_TIME) && (! BLOAD_ONLY)
SavePPBuffer(" ");
#endif
while ((nextOne = GetAssertArgument(readSource,tempToken,
error,endType,constantsOnly,&printError)) != NULL)
{
if (argHead == NULL) argHead = nextOne;
else lastOne->nextArg = nextOne;
lastOne = nextOne;
#if (! RUN_TIME) && (! BLOAD_ONLY)
SavePPBuffer(" ");
#endif
}
/*===========================================================*/
/* If an error occurred, set the error flag and return NULL. */
/*===========================================================*/
if (*error)
{
if (printError) SyntaxErrorMessage("RHS patterns");
ReturnExpression(firstOne);
ReturnExpression(argHead);
return(NULL);
}
/*=====================================*/
/* Fix the pretty print representation */
/* of the RHS ordered fact. */
/*=====================================*/
#if (! RUN_TIME) && (! BLOAD_ONLY)
PPBackup();
PPBackup();
SavePPBuffer(tempToken->printForm);
#endif
/*==========================================================*/
/* Ordered fact assertions are processed by stuffing all of */
/* the fact's proposition (except the relation name) into a */
/* single multifield slot. */
/*==========================================================*/
firstOne->nextArg = GenConstant(FACT_STORE_MULTIFIELD,AddBitMap("\0",1));
firstOne->nextArg->argList = argHead;
#if FUZZY_DEFTEMPLATES
} /* --- matches else { above with FUZZY_DEFTEMPLATES */
#endif
#if CERTAINTY_FACTORS
/* if certaintly factors allowed then the next item after a fact
specifier could be a certainty factor spec --- CF x.xxx
*/
#if (! RUN_TIME) && (! BLOAD_ONLY)
SavePPBuffer(" ");
#endif
GetToken(readSource,tempToken);
if ((tempToken->type == SYMBOL) &&
((strcmp(ValueToString(tempToken->value),"CF") == 0) ||
(strcmp(ValueToString(tempToken->value),"cf") == 0))
)
{
struct expr *CFexpr;
/* expecting a certainty factor (float) expression */
/* tokenToFloatExpression expect 1st token already read */
#if (! RUN_TIME) && (! BLOAD_ONLY)
SavePPBuffer(" ");
#endif
GetToken(readSource,tempToken);
CFexpr = tokenToFloatExpression(readSource,tempToken,error,constantsOnly);
if (*error)
{
ReturnExpression(firstOne);
return( NULL );
}
if (CFexpr->type == FLOAT) /* if constant -- check range */
{
double cfval = ValueToDouble(CFexpr->value);
if (cfval > 1.0 || cfval < 0.0)
{
*error = TRUE;
ReturnExpression(CFexpr);
cfRangeError();
ReturnExpression(firstOne);
return( NULL );
}
}
/* store the CF expression in the argList of the DEFTEMPLATE_PTR expr */
firstOne->argList = CFexpr;
}
else
{
/* Do an 'UnGetToken' function here to undo the lookahead for a CF.
Also need to PPBackup over the space added before reading the
potential CF expression -- UnGetToken does one PPBackup over the
token which was added to the PP Buffer
*/
UnGetToken(tempToken);
#if (! RUN_TIME) && (! BLOAD_ONLY)
PPBackup();
#endif
}
#endif /* CERTAINTY_FACTORS */
/*==============================*/
/* Return the RHS ordered fact. */
/*==============================*/
return(firstOne);
}
