insqypsr.c

clips源代码

   /*******************************************************/
   /*      "C" Language Integrated Production System      */
   /*                                                     */
   /*               CLIPS Version 6.24  06/05/06          */
   /*                                                     */
   /*          INSTANCE-SET QUERIES PARSER MODULE         */
   /*******************************************************/

/*************************************************************/
/* Purpose: Instance_set Queries Parsing Routines            */
/*                                                           */
/* Principal Programmer(s):                                  */
/*      Brian L. Donnell                                     */
/*                                                           */
/* Contributing Programmer(s):                               */
/*                                                           */
/*                                                           */
/* Revision History:                                         */
/*      6.23: Changed name of variable exp to theExp         */
/*            because of Unix compiler warnings of shadowed  */
/*            definitions.                                   */
/*                                                           */
/*      6.24: Renamed BOOLEAN macro type to intBool.         */
/*                                                           */
/*************************************************************/

/* =========================================
   *****************************************
               EXTERNAL DEFINITIONS
   =========================================
   ***************************************** */
#include "setup.h"

#if INSTANCE_SET_QUERIES && (! RUN_TIME)

#include <string.h>

#include "classcom.h"
#include "envrnmnt.h"
#include "exprnpsr.h"
#include "extnfunc.h"
#include "insquery.h"
#include "prcdrpsr.h"
#include "prntutil.h"
#include "router.h"
#include "scanner.h"
#include "strngrtr.h"

#define _INSQYPSR_SOURCE_
#include "insqypsr.h"

/* =========================================
   *****************************************
                   CONSTANTS
   =========================================
   ***************************************** */
#define INSTANCE_SLOT_REF ':'

/* =========================================
   *****************************************
      INTERNALLY VISIBLE FUNCTION HEADERS
   =========================================
   ***************************************** */

static EXPRESSION *ParseQueryRestrictions(void *,EXPRESSION *,char *,struct token *);
static intBool ReplaceClassNameWithReference(void *,EXPRESSION *);
static int ParseQueryTestExpression(void *,EXPRESSION *,char *);
static int ParseQueryActionExpression(void *,EXPRESSION *,char *,EXPRESSION *,struct token *);
static void ReplaceInstanceVariables(void *,EXPRESSION *,EXPRESSION *,int,int);
static void ReplaceSlotReference(void *,EXPRESSION *,EXPRESSION *,
                                 struct FunctionDefinition *,int);
static int IsQueryFunction(EXPRESSION *);

/* =========================================
   *****************************************
          EXTERNALLY VISIBLE FUNCTIONS
   =========================================
   ***************************************** */

/***********************************************************************
  NAME         : ParseQueryNoAction
  DESCRIPTION  : Parses the following functions :
                   (any-instancep)
                   (find-first-instance)
                   (find-all-instances)
  INPUTS       : 1) The address of the top node of the query function
                 2) The logical name of the input
  RETURNS      : The completed expression chain, or NULL on errors
  SIDE EFFECTS : The expression chain is extended, or the "top" node
                 is deleted on errors
  NOTES        : H/L Syntax :

                 (<function> <query-block>)

                 <query-block>  :== (<instance-var>+) <query-expression>
                 <instance-var> :== (<var-name> <class-name>+)

                 Parses into following form :

                 <query-function>
                      |
                      V
                 <query-expression>  ->

                 <class-1a> -> <class-1b> -> (QDS) ->

                 <class-2a> -> <class-2b> -> (QDS) -> ...
 ***********************************************************************/
globle EXPRESSION *ParseQueryNoAction(
  void *theEnv,
  EXPRESSION *top,
  char *readSource)
  {
   EXPRESSION *insQuerySetVars;
   struct token queryInputToken;

   insQuerySetVars = ParseQueryRestrictions(theEnv,top,readSource,&queryInputToken);
   if (insQuerySetVars == NULL)
     return(NULL);
   IncrementIndentDepth(theEnv,3);
   PPCRAndIndent(theEnv);
   if (ParseQueryTestExpression(theEnv,top,readSource) == FALSE)
     {
      DecrementIndentDepth(theEnv,3);
      ReturnExpression(theEnv,insQuerySetVars);
      return(NULL);
     }
   DecrementIndentDepth(theEnv,3);
   GetToken(theEnv,readSource,&queryInputToken);
   if (GetType(queryInputToken) != RPAREN)
     {
      SyntaxErrorMessage(theEnv,"instance-set query function");
      ReturnExpression(theEnv,top);
      ReturnExpression(theEnv,insQuerySetVars);
      return(NULL);
     }
   ReplaceInstanceVariables(theEnv,insQuerySetVars,top->argList,TRUE,0);
   ReturnExpression(theEnv,insQuerySetVars);
   return(top);
  }

/***********************************************************************
  NAME         : ParseQueryAction
  DESCRIPTION  : Parses the following functions :
                   (do-for-instance)
                   (do-for-all-instances)
                   (delayed-do-for-all-instances)
  INPUTS       : 1) The address of the top node of the query function
                 2) The logical name of the input
  RETURNS      : The completed expression chain, or NULL on errors
  SIDE EFFECTS : The expression chain is extended, or the "top" node
                 is deleted on errors
  NOTES        : H/L Syntax :

                 (<function> <query-block> <query-action>)

                 <query-block>  :== (<instance-var>+) <query-expression>
                 <instance-var> :== (<var-name> <class-name>+)

                 Parses into following form :

                 <query-function>
                      |
                      V
                 <query-expression> -> <query-action>  ->

                 <class-1a> -> <class-1b> -> (QDS) ->

                 <class-2a> -> <class-2b> -> (QDS) -> ...
 ***********************************************************************/
globle EXPRESSION *ParseQueryAction(
  void *theEnv,
  EXPRESSION *top,
  char *readSource)
  {
   EXPRESSION *insQuerySetVars;
   struct token queryInputToken;

   insQuerySetVars = ParseQueryRestrictions(theEnv,top,readSource,&queryInputToken);
   if (insQuerySetVars == NULL)
     return(NULL);
   IncrementIndentDepth(theEnv,3);
   PPCRAndIndent(theEnv);
   if (ParseQueryTestExpression(theEnv,top,readSource) == FALSE)
     {
      DecrementIndentDepth(theEnv,3);
      ReturnExpression(theEnv,insQuerySetVars);
      return(NULL);
     }
   PPCRAndIndent(theEnv);
   if (ParseQueryActionExpression(theEnv,top,readSource,insQuerySetVars,&queryInputToken) == FALSE)
     {
      DecrementIndentDepth(theEnv,3);
      ReturnExpression(theEnv,insQuerySetVars);
      return(NULL);
     }
   DecrementIndentDepth(theEnv,3);
   
   if (GetType(queryInputToken) != RPAREN)
     {
      SyntaxErrorMessage(theEnv,"instance-set query function");
      ReturnExpression(theEnv,top);
      ReturnExpression(theEnv,insQuerySetVars);
      return(NULL);
     }
   ReplaceInstanceVariables(theEnv,insQuerySetVars,top->argList,TRUE,0);
   ReplaceInstanceVariables(theEnv,insQuerySetVars,top->argList->nextArg,FALSE,0);
   ReturnExpression(theEnv,insQuerySetVars);
   return(top);
  }

/* =========================================
   *****************************************
          INTERNALLY VISIBLE FUNCTIONS
   =========================================
   ***************************************** */

/***************************************************************
  NAME         : ParseQueryRestrictions
  DESCRIPTION  : Parses the class restrictions for a query
  INPUTS       : 1) The top node of the query expression
                 2) The logical name of the input
                 3) Caller's token buffer
  RETURNS      : The instance-variable expressions
  SIDE EFFECTS : Entire query expression deleted on errors
                 Nodes allocated for restrictions and instance
                   variable expressions
                 Class restrictions attached to query-expression
                   as arguments
  NOTES        : Expects top != NULL
 ***************************************************************/
static EXPRESSION *ParseQueryRestrictions(
  void *theEnv,
  EXPRESSION *top,
  char *readSource,
  struct token *queryInputToken)
  {
   EXPRESSION *insQuerySetVars = NULL,*lastInsQuerySetVars = NULL,
              *classExp = NULL,*lastClassExp,
              *tmp,*lastOne = NULL;
   int error = FALSE;

   SavePPBuffer(theEnv," ");
   GetToken(theEnv,readSource,queryInputToken);
   if (queryInputToken->type != LPAREN)
     goto ParseQueryRestrictionsError1;
   GetToken(theEnv,readSource,queryInputToken);
   if (queryInputToken->type != LPAREN)
     goto ParseQueryRestrictionsError1;
   while (queryInputToken->type == LPAREN)
     {
      GetToken(theEnv,readSource,queryInputToken);
      if (queryInputToken->type != SF_VARIABLE)
        goto ParseQueryRestrictionsError1;
      tmp = insQuerySetVars;
      while (tmp != NULL)
        {
         if (tmp->value == queryInputToken->value)
           {
            PrintErrorID(theEnv,"INSQYPSR",1,FALSE);
            EnvPrintRouter(theEnv,WERROR,"Duplicate instance member variable name in function ");
            EnvPrintRouter(theEnv,WERROR,ValueToString(ExpressionFunctionCallName(top)));
            EnvPrintRouter(theEnv,WERROR,".\n");
            goto ParseQueryRestrictionsError2;
           }
         tmp = tmp->nextArg;
        }
      tmp = GenConstant(theEnv,SF_VARIABLE,queryInputToken->value);
      if (insQuerySetVars == NULL)
        insQuerySetVars = tmp;
      else
        lastInsQuerySetVars->nextArg = tmp;
      lastInsQuerySetVars = tmp;
      SavePPBuffer(theEnv," ");
      classExp = ArgumentParse(theEnv,readSource,&error);
      if (error)
        goto ParseQueryRestrictionsError2;
      if (classExp == NULL)
        goto ParseQueryRestrictionsError1;
      if (ReplaceClassNameWithReference(theEnv,classExp) == FALSE)
        goto ParseQueryRestrictionsError2;
      lastClassExp = classExp;
      SavePPBuffer(theEnv," ");
      while ((tmp = ArgumentParse(theEnv,readSource,&error)) != NULL)
        {
         if (ReplaceClassNameWithReference(theEnv,tmp) == FALSE)
           goto ParseQueryRestrictionsError2;
         lastClassExp->nextArg = tmp;
         lastClassExp = tmp;
         SavePPBuffer(theEnv," ");
        }
      if (error)
        goto ParseQueryRestrictionsError2;
      PPBackup(theEnv);
      PPBackup(theEnv);
      SavePPBuffer(theEnv,")");
      tmp = GenConstant(theEnv,SYMBOL,(void *) InstanceQueryData(theEnv)->QUERY_DELIMETER_SYMBOL);
      lastClassExp->nextArg = tmp;
      lastClassExp = tmp;
      if (top->argList == NULL)
        top->argList = classExp;
      else
        lastOne->nextArg = classExp;
      lastOne = lastClassExp;
      classExp = NULL;
      SavePPBuffer(theEnv," ");
      GetToken(theEnv,readSource,queryInputToken);
     }
   if (queryInputToken->type != RPAREN)
     goto ParseQueryRestrictionsError1;
   PPBackup(theEnv);
   PPBackup(theEnv);
   SavePPBuffer(theEnv,")");
   return(insQuerySetVars);

ParseQueryRestrictionsError1:
   SyntaxErrorMessage(theEnv,"instance-set query function");

ParseQueryRestrictionsError2:
   ReturnExpression(theEnv,classExp);
   ReturnExpression(theEnv,top);
   ReturnExpression(theEnv,insQuerySetVars);
   return(NULL);
  }

/***************************************************
  NAME         : ReplaceClassNameWithReference
  DESCRIPTION  : In parsing an instance-set query,
                 this function replaces a constant
                 class name with an actual pointer
                 to the class
  INPUTS       : The expression
  RETURNS      : TRUE if all OK, FALSE
                 if class cannot be found
  SIDE EFFECTS : The expression type and value are
                 modified if class is found
  NOTES        : Searches current and imported
                 modules for reference