commline.c

VC嵌入式CLips专家系统,实现战场环境的目标识别

       
/*******************************************/
/* PrintPrompt: Prints the command prompt. */
/*******************************************/
globle void PrintPrompt(
   void *theEnv)
   {
    EnvPrintRouter(theEnv,WPROMPT,COMMAND_PROMPT);

    if (CommandLineData(theEnv)->AfterPromptFunction != NULL)
      { (*CommandLineData(theEnv)->AfterPromptFunction)(theEnv); }
   }

/*****************************************/
/* PrintBanner: Prints the CLIPS banner. */
/*****************************************/
globle void PrintBanner(
   void *theEnv)
   {
    EnvPrintRouter(theEnv,WPROMPT,CommandLineData(theEnv)->BannerString);
   }

/************************************************/
/* SetAfterPromptFunction: Replaces the current */
/*   value of AfterPromptFunction.              */
/************************************************/
globle void SetAfterPromptFunction(
  void *theEnv,
  int (*funptr)(void *))
  {
   CommandLineData(theEnv)->AfterPromptFunction = funptr;
  }

/************************************************/
/* RouteCommand: Processes a completed command. */
/************************************************/
globle intBool RouteCommand(
  void *theEnv,
  char *command,
  int printResult)
  {
   DATA_OBJECT result;
   struct expr *top;
   char *commandName;
   struct token theToken;

   if (command == NULL)
     { return(0); }

   /*========================================*/
   /* Open a string input source and get the */
   /* first token from that source.          */
   /*========================================*/

   OpenStringSource(theEnv,"command",command,0);

   GetToken(theEnv,"command",&theToken);

   /*=====================*/
   /* Evaluate constants. */
   /*=====================*/

   if ((theToken.type == SYMBOL) || (theToken.type == STRING) ||
       (theToken.type == FLOAT) || (theToken.type == INTEGER) ||
       (theToken.type == INSTANCE_NAME))
     {
      CloseStringSource(theEnv,"command");
      if (printResult)
        {
         PrintAtom(theEnv,"stdout",theToken.type,theToken.value);
         EnvPrintRouter(theEnv,"stdout","\n");
        }
      return(1);
     }

   /*============================*/
   /* Evaluate global variables. */
   /*============================*/

   if (theToken.type == GBL_VARIABLE)
     {
      CloseStringSource(theEnv,"command");
      top = GenConstant(theEnv,theToken.type,theToken.value);
      EvaluateExpression(theEnv,top,&result);
      rtn_struct(theEnv,expr,top);
      if (printResult)
        {
         PrintDataObject(theEnv,"stdout",&result);
         EnvPrintRouter(theEnv,"stdout","\n");
        }
      return(1);
     }

   /*========================================================*/
   /* If the next token isn't the beginning left parenthesis */
   /* of a command or construct, then whatever was entered   */
   /* cannot be evaluated at the command prompt.             */
   /*========================================================*/

   if (theToken.type != LPAREN)
     {
      PrintErrorID(theEnv,"COMMLINE",1,FALSE);
      EnvPrintRouter(theEnv,WERROR,"Expected a '(', constant, or global variable\n");
      CloseStringSource(theEnv,"command");
      return(0);
     }

   /*===========================================================*/
   /* The next token must be a function name or construct type. */
   /*===========================================================*/

   GetToken(theEnv,"command",&theToken);
   if (theToken.type != SYMBOL)
     {
      PrintErrorID(theEnv,"COMMLINE",2,FALSE);
      EnvPrintRouter(theEnv,WERROR,"Expected a command.\n");
      CloseStringSource(theEnv,"command");
      return(0);
     }

   commandName = ValueToString(theToken.value);

   /*======================*/
   /* Evaluate constructs. */
   /*======================*/

#if (! RUN_TIME) && (! BLOAD_ONLY)
   {
    int errorFlag;

    errorFlag = ParseConstruct(theEnv,commandName,"command");
    if (errorFlag != -1)
      {
       CloseStringSource(theEnv,"command");
       if (errorFlag == 1)
         {
          EnvPrintRouter(theEnv,WERROR,"\nERROR:\n");
          PrintInChunks(theEnv,WERROR,GetPPBuffer(theEnv));
          EnvPrintRouter(theEnv,WERROR,"\n");
         }
       DestroyPPBuffer(theEnv);
       return(errorFlag);
      }
   }
#endif

   /*========================*/
   /* Parse a function call. */
   /*========================*/

   CommandLineData(theEnv)->ParsingTopLevelCommand = TRUE;
   top = Function2Parse(theEnv,"command",commandName);
   CommandLineData(theEnv)->ParsingTopLevelCommand = FALSE;
   ClearParsedBindNames(theEnv);

   /*================================*/
   /* Close the string input source. */
   /*================================*/

   CloseStringSource(theEnv,"command");

   /*=========================*/
   /* Evaluate function call. */
   /*=========================*/

   if (top == NULL) return(0);
   CommandLineData(theEnv)->EvaluatingTopLevelCommand = TRUE;
   ExpressionInstall(theEnv,top);
   EvaluateExpression(theEnv,top,&result);
   ExpressionDeinstall(theEnv,top);
   CommandLineData(theEnv)->EvaluatingTopLevelCommand = FALSE;
   ReturnExpression(theEnv,top);

   if ((result.type != RVOID) && printResult)
     {
      PrintDataObject(theEnv,"stdout",&result);
      EnvPrintRouter(theEnv,"stdout","\n");
     }

   return(1);
  }

/*****************************************************************/
/* DefaultGetNextEvent: Default event-handling function. Handles */
/*   only keyboard events by first calling GetcRouter to get a   */
/*   character and then calling ExpandCommandString to add the   */
/*   character to the CommandString.                             */
/*****************************************************************/
static int DefaultGetNextEvent(
  void *theEnv)
  {
   int inchar;

   inchar = EnvGetcRouter(theEnv,"stdin");

   if (inchar == EOF) inchar = '\n';

   ExpandCommandString(theEnv,(char) inchar);
   
   return 0;
  }

/*************************************/
/* SetEventFunction: Replaces the    */
/*   current value of EventFunction. */
/*************************************/
globle int (*SetEventFunction(void *theEnv,int (*theFunction)(void *)))(void *)
  {
   int (*tmp_ptr)(void *);

   tmp_ptr = CommandLineData(theEnv)->EventFunction;
   CommandLineData(theEnv)->EventFunction = theFunction;
   return(tmp_ptr);
  }

/****************************************/
/* TopLevelCommand: Indicates whether a */
/*   top-level command is being parsed. */
/****************************************/
globle intBool TopLevelCommand(
  void *theEnv)
  {
   return(CommandLineData(theEnv)->ParsingTopLevelCommand);
  }

/***********************************************************/
/* GetCommandCompletionString: Returns the last token in a */
/*   string if it is a valid token for command completion. */
/***********************************************************/
globle char *GetCommandCompletionString(
  void *theEnv,
  char *theString,
  unsigned maxPosition)
  {
   struct token lastToken;
   struct token theToken;
   char lastChar;
   char *rs;
   unsigned length;

   /*=========================*/
   /* Get the command string. */
   /*=========================*/

   if (theString == NULL) return("");

   /*=========================================================================*/
   /* If the last character in the command string is a space, character       */
   /* return, or quotation mark, then the command completion can be anything. */
   /*=========================================================================*/

   lastChar = theString[maxPosition - 1];
   if ((lastChar == ' ') || (lastChar == '"') ||
       (lastChar == '\t') || (lastChar == '\f') ||
       (lastChar == '\n') || (lastChar == '\r'))
     { return(""); }

   /*============================================*/
   /* Find the last token in the command string. */
   /*============================================*/

   OpenTextSource(theEnv,"CommandCompletion",theString,0,maxPosition);
   ScannerData(theEnv)->IgnoreCompletionErrors = TRUE;
   GetToken(theEnv,"CommandCompletion",&theToken);
   CopyToken(&lastToken,&theToken);
   while (theToken.type != STOP)
     {
      CopyToken(&lastToken,&theToken);
      GetToken(theEnv,"CommandCompletion",&theToken);
     }
   CloseStringSource(theEnv,"CommandCompletion");
   ScannerData(theEnv)->IgnoreCompletionErrors = FALSE;

   /*===============================================*/
   /* Determine if the last token can be completed. */
   /*===============================================*/

   if (lastToken.type == SYMBOL)
     {
      rs = ValueToString(lastToken.value);
      if (rs[0] == '[') return (&rs[1]);
      return(ValueToString(lastToken.value));
     }
   else if (lastToken.type == SF_VARIABLE)
     { return(ValueToString(lastToken.value)); }
   else if (lastToken.type == MF_VARIABLE)
     { return(ValueToString(lastToken.value)); }
   else if ((lastToken.type == GBL_VARIABLE) || (lastToken.type == MF_GBL_VARIABLE) ||
            (lastToken.type == INSTANCE_NAME))
     { return(NULL); }
   else if (lastToken.type == STRING)
     {
      length = strlen(ValueToString(lastToken.value));
      return(GetCommandCompletionString(theEnv,ValueToString(lastToken.value),length));
     }
   else if ((lastToken.type == FLOAT) || (lastToken.type == INTEGER))
     { return(NULL); }

   return("");
  }

/****************************************************************/
/* SetHaltCommandLoopBatch: Sets the HaltCommandLoopBatch flag. */
/****************************************************************/
globle void SetHaltCommandLoopBatch(
  void *theEnv,
  int value)
  { 
   CommandLineData(theEnv)->HaltCommandLoopBatch = value; 
  }

/*******************************************************************/
/* GetHaltCommandLoopBatch: Returns the HaltCommandLoopBatch flag. */
/*******************************************************************/
globle int GetHaltCommandLoopBatch(
  void *theEnv)
  {
   return(CommandLineData(theEnv)->HaltCommandLoopBatch);
  }

#endif