strngfun.c

NASA 开发使用的一个专家系统

   /*******************************************************/
   /*      "C" Language Integrated Production System      */
   /*                                                     */
   /*             CLIPS Version 6.05  04/09/97            */
   /*                                                     */
   /*               STRING FUNCTIONS MODULE               */
   /*******************************************************/

/*************************************************************/
/* Purpose: Contains the code for several string functions   */
/*   including str-cat, sym-cat, str-length, str-compare,    */
/*   upcase, lowcase, sub-string, str-index, eval, and       */
/*   build.                                                  */
/*                                                           */
/* Principal Programmer(s):                                  */
/*      Gary D. Riley                                        */
/*                                                           */
/* Contributing Programmer(s):                               */
/*      Barry Cameron                                        */
/*                                                           */
/* Revision History:                                         */
/*                                                           */
/*************************************************************/

#define _STRNGFUN_SOURCE_

#include "setup.h"

#if STRING_FUNCTIONS

#include <stdio.h>
#define _CLIPS_STDIO_
#include <ctype.h>
#include <string.h>

#include "clipsmem.h"
#include "extnfunc.h"
#include "argacces.h"
#include "router.h"
#include "strngrtr.h"
#include "scanner.h" 
#include "prcdrpsr.h"
#include "cstrcpsr.h"
#include "exprnpsr.h"
#include "constrct.h"

#if DEFRULE_CONSTRUCT
#include "drive.h"
#endif

#include "strngfun.h"

/***************************************/
/* LOCAL INTERNAL FUNCTION DEFINITIONS */
/***************************************/

#if ANSI_COMPILER   
   static VOID                    StrOrSymCatFunction(DATA_OBJECT_PTR,int);
#else
   static VOID                    StrOrSymCatFunction();
#endif

#if ! RUN_TIME
/******************************************/
/* StringFunctionDefinitions: Initializes */
/*   the string manipulation functions.   */
/******************************************/
globle VOID StringFunctionDefinitions()
  {
   DefineFunction2("str-cat", 'k', PTIF StrCatFunction, "StrCatFunction", "1*");
   DefineFunction2("sym-cat", 'k', PTIF SymCatFunction, "SymCatFunction", "1*");
   DefineFunction2("str-length", 'l', PTIF StrLengthFunction, "StrLengthFunction", "11j");
   DefineFunction2("str-compare", 'l', PTIF StrCompareFunction, "StrCompareFunction", "23*jji");
   DefineFunction2("upcase", 'j', PTIF UpcaseFunction, "UpcaseFunction", "11j");
   DefineFunction2("lowcase", 'j', PTIF LowcaseFunction, "LowcaseFunction", "11j");
   DefineFunction2("sub-string", 's', PTIF SubStringFunction, "SubStringFunction", "33*iij");
   DefineFunction2("str-index", 'u', PTIF StrIndexFunction, "StrIndexFunction", "22j");
   DefineFunction2("eval", 'u', PTIF EvalFunction, "EvalFunction", "11k");
   DefineFunction2("build", 'b', PTIF BuildFunction, "BuildFunction", "11k");
  }
#endif

/****************************************/
/* StrCatFunction: CLIPS access routine */
/*   for the str-cat function.          */
/****************************************/
globle VOID StrCatFunction(returnValue)
  DATA_OBJECT_PTR returnValue;
  { StrOrSymCatFunction(returnValue,STRING); }

/****************************************/
/* SymCatFunction: CLIPS access routine */
/*   for the sym-cat function.          */
/****************************************/
globle VOID SymCatFunction(returnValue)
  DATA_OBJECT_PTR returnValue;
  {
   StrOrSymCatFunction(returnValue,SYMBOL);
  }

/********************************************************/
/* StrOrSymCatFunction: Driver routine for implementing */
/*   the str-cat and sym-cat functions.                 */
/********************************************************/
static VOID StrOrSymCatFunction(returnValue,returnType)
  DATA_OBJECT_PTR returnValue;
  int returnType;
  {
   DATA_OBJECT theArg;
   int numArgs, i, total, j;
   char *theString, **arrayOfStrings;
   VOID *hashPtr;
   char *functionName;

   /*============================================*/
   /* Determine the calling function name.       */
   /* Store the null string or the symbol nil as */
   /* the return value in the event of an error. */
   /*============================================*/
   
   SetpType(returnValue,returnType);
   if (returnType == STRING) 
     {
      functionName = "str-cat";
      SetpValue(returnValue,(VOID *) AddSymbol(""));
     }
   else 
     {
      functionName = "sym-cat";
      SetpValue(returnValue,(VOID *) AddSymbol("nil"));
     }

   /*===============================================*/
   /* Determine the number of arguments as create a */
   /* string array which is large enough to store   */
   /* the string representation of each argument.   */
   /*===============================================*/
   
   numArgs = RtnArgCount();
   arrayOfStrings = (char **) gm1((int) sizeof(char *) * numArgs);

   /*=============================================*/
   /* Evaluate each argument and store its string */
   /* representation in the string array.         */
   /*=============================================*/
   
   total = 1;
   for (i = 1 ; i <= numArgs ; i++)
     {
      RtnUnknown(i,&theArg);
        
      switch(GetType(theArg))
        {
         case STRING:
#if OBJECT_SYSTEM
         case INSTANCE_NAME:
#endif
         case SYMBOL:
           arrayOfStrings[i-1] = ValueToString(GetValue(theArg));
           break;
           
         case FLOAT:
           hashPtr = AddSymbol(FloatToString(ValueToDouble(GetValue(theArg))));
           arrayOfStrings[i-1] = ValueToString(hashPtr);
           break;
           
         case INTEGER:
           hashPtr = AddSymbol(LongIntegerToString(ValueToLong(GetValue(theArg))));
           arrayOfStrings[i-1] = ValueToString(hashPtr);
           break;
           
         default: 
           ExpectedTypeError1(functionName,i,"string, instance name, symbol, float, or integer");
           SetEvaluationError(CLIPS_TRUE);
           break;
        }

      if (EvaluationError)
        {
         rm(arrayOfStrings,(int) sizeof(char *) * numArgs);
         return;
        }
        
      total += strlen(arrayOfStrings[i - 1]);
     }
     
   /*=========================================================*/
   /* Allocate the memory to store the concatenated string or */
   /* symbol, then copy the values in the string array to the */
   /* memory just allocated.                                  */
   /*=========================================================*/
   
   theString = (char *) gm2 (((int) sizeof(char) * total));

   j = 0;
   for (i = 0 ; i < numArgs ; i++)
     {
      sprintf(&theString[j],"%s",arrayOfStrings[i]);
      j += strlen(arrayOfStrings[i]);
     }

   /*=========================================*/
   /* Return the concatenated value and clean */
   /* up the temporary memory used.           */
   /*=========================================*/
   
   SetpValue(returnValue,(VOID *) AddSymbol(theString));
   rm(theString,(int) sizeof(char) * total);
   rm(arrayOfStrings,(int) sizeof(char *) * numArgs);
  }

/*******************************************/
/* StrLengthFunction: CLIPS access routine */
/*   for the str-length function.          */
/*******************************************/
globle long int StrLengthFunction()
  {
   DATA_OBJECT theArg;

   /*===================================================*/
   /* Function str-length expects exactly one argument. */
   /*===================================================*/

   if (ArgCountCheck("str-length",EXACTLY,1) == -1)
     { return(-1L); }

   /*==================================================*/
   /* The argument should be of type symbol or string. */
   /*==================================================*/

   if (ArgTypeCheck("str-length",1,SYMBOL_OR_STRING,&theArg) == CLIPS_FALSE)
     { return(-1L); }

   /*============================================*/
   /* Return the length of the string or symbol. */
   /*============================================*/

   return( (long) strlen(DOToString(theArg)));
  }

/****************************************/
/* UpcaseFunction: CLIPS access routine */
/*   for the upcase function.           */
/****************************************/
globle VOID UpcaseFunction(returnValue)
  DATA_OBJECT_PTR returnValue;
  {
   DATA_OBJECT theArg;
   int i, slen;
   char *osptr, *nsptr;

   /*===============================================*/
   /* Function upcase expects exactly one argument. */
   /*===============================================*/

   if (ArgCountCheck("upcase",EXACTLY,1) == -1)
     {
      SetpType(returnValue,STRING);
      SetpValue(returnValue,(VOID *) AddSymbol(""));
      return;
     }

   /*==================================================*/
   /* The argument should be of type symbol or string. */
   /*==================================================*/

   if (ArgTypeCheck("upcase",1,SYMBOL_OR_STRING,&theArg) == CLIPS_FALSE)
     {
      SetpType(returnValue,STRING);
      SetpValue(returnValue,(VOID *) AddSymbol(""));
      return;
     }

   /*======================================================*/
   /* Allocate temporary memory and then copy the original */
   /* string or symbol to that memory, while uppercasing   */
   /* lower case alphabetic characters.                    */
   /*======================================================*/
    
   osptr = DOToString(theArg);
   slen = strlen(osptr) + 1;
   nsptr = (char *) gm2(slen);

   for (i = 0  ; i < slen ; i++)
     {
      if (islower(osptr[i]))
        { nsptr[i] = (char) toupper(osptr[i]); }
      else
        { nsptr[i] = osptr[i]; }
     }

   /*========================================*/
   /* Return the uppercased string and clean */
   /* up the temporary memory used.          */
   /*========================================*/

   SetpType(returnValue,GetType(theArg));
   SetpValue(returnValue,(VOID *) AddSymbol(nsptr));
   rm(nsptr,slen);
  }

/*****************************************/
/* LowcaseFunction: CLIPS access routine */
/*   for the lowcase function.           */
/*****************************************/
globle VOID LowcaseFunction(returnValue)
  DATA_OBJECT_PTR returnValue;
  {
   DATA_OBJECT theArg;
   int i, slen;
   char *osptr, *nsptr;

   /*================================================*/
   /* Function lowcase expects exactly one argument. */
   /*================================================*/

   if (ArgCountCheck("lowcase",EXACTLY,1) == -1)
     {
      SetpType(returnValue,STRING);
      SetpValue(returnValue,(VOID *) AddSymbol(""));
      return;
     }

   /*==================================================*/
   /* The argument should be of type symbol or string. */
   /*==================================================*/

   if (ArgTypeCheck("lowcase",1,SYMBOL_OR_STRING,&theArg) == CLIPS_FALSE)
     {
      SetpType(returnValue,STRING);
      SetpValue(returnValue,(VOID *) AddSymbol(""));
      return;
     }

   /*======================================================*/
   /* Allocate temporary memory and then copy the original */
   /* string or symbol to that memory, while lowercasing   */
   /* upper case alphabetic characters.                    */
   /*======================================================*/
   
   osptr = DOToString(theArg);
   slen = strlen(osptr) + 1;
   nsptr = (char *) gm2(slen);

   for (i = 0  ; i < slen ; i++)
     {
      if (isupper(osptr[i]))
        { nsptr[i] = (char) tolower(osptr[i]); }
      else
        { nsptr[i] = osptr[i]; }
     }

   /*========================================*/
   /* Return the lowercased string and clean */
   /* up the temporary memory used.          */
   /*========================================*/

   SetpType(returnValue,GetType(theArg));
   SetpValue(returnValue,(VOID *) AddSymbol(nsptr));
   rm(nsptr,slen);
  }

/********************************************/
/* StrCompareFunction: CLIPS access routine */
/*   for the str-compare function.          */
/********************************************/
globle long int StrCompareFunction()
  {
   int numArgs, length;
   DATA_OBJECT arg1, arg2, arg3;
   long returnValue;

   /*=======================================================*/
   /* Function str-compare expects either 2 or 3 arguments. */
   /*=======================================================*/

   if ((numArgs = ArgRangeCheck("str-compare",2,3)) == -1) return(0L);

   /*=============================================================*/
   /* The first two arguments should be of type symbol or string. */
   /*=============================================================*/

   if (ArgTypeCheck("str-compare",1,SYMBOL_OR_STRING,&arg1) == CLIPS_FALSE)
     { return(0L); }

   if (ArgTypeCheck("str-compare",2,SYMBOL_OR_STRING,&arg2) == CLIPS_FALSE)
     { return(0L); }

   /*===================================================*/
   /* Compare the strings. Use the 3rd argument for the */
   /* maximum length of comparison, if it is provided.  */
   /*===================================================*/

   if (numArgs == 3)
     {
      if (ArgTypeCheck("str-compare",3,INTEGER,&arg3) == CLIPS_FALSE)
        { return(0L); }

      length = CoerceToInteger(GetType(arg3),GetValue(arg3));
      returnValue = strncmp(DOToString(arg1),DOToString(arg2),
                            (CLIPS_STD_SIZE) length);
     }
   else
     { returnValue = strcmp(DOToString(arg1),DOToString(arg2)); }

   /*========================================================*/
   /* Return Values are as follows:                          */
   /* -1 is returned if <string-1> is less than <string-2>.  */
   /*  1 is return if <string-1> is greater than <string-2>. */
   /*  0 is returned if <string-1> is equal to <string-2>.   */
   /*========================================================*/
   
   if (returnValue < 0) returnValue = -1;
   else if (returnValue > 0) returnValue = 1;
   return(returnValue);
  }

/*******************************************/
/* SubStringFunction: CLIPS access routine */
/*   for the sub-string function.          */
/*******************************************/
globle VOID *SubStringFunction()
  {
   DATA_OBJECT theArgument;
   char *tempString, *returnString;
   int start, end, i, j;
   VOID *returnValue;

   /*===================================*/
   /* Check and retrieve the arguments. */
   /*===================================*/

   if (ArgCountCheck("sub-string",EXACTLY,3) == -1)
     { return((VOID *) AddSymbol("")); }

   if (ArgTypeCheck("sub-string",1,INTEGER,&theArgument) == CLIPS_FALSE)
     { return((VOID *) AddSymbol("")); }

   start = CoerceToInteger(theArgument.type,theArgument.value) - 1;

   if (ArgTypeCheck("sub-string",2,INTEGER,&theArgument) == CLIPS_FALSE)
     {  return((VOID *) AddSymbol("")); }