commline.c

来自「clips源代码」· C语言 代码 · 共 997 行 · 第 1/3 页

              if (isprint(inchar))
                {
                 while ((inchar = mstring[i++]) != EOS)
                   {
                    if ((inchar == '\n') || (inchar == '\r'))
                      {
                       if (error) return(-1);
                       else return(1);
                      }
                   }
                 return(0);
                }
             }
           break;
        }
     }

   /*====================================================*/
   /* Return 0 because a complete command was not found. */
   /*====================================================*/

   return(0);
  }

/***********************************************************/
/* DoString: Skips over a string contained within a string */
/*   until the closing quotation mark is encountered.      */
/***********************************************************/
static int DoString(
  char *str,
  int pos,
  int *complete)
  {
   int inchar;

   /*=================================================*/
   /* Process the string character by character until */
   /* the closing quotation mark is found.            */
   /*=================================================*/

   inchar = str[pos];
   while (inchar  != '"')
     {
      /*=====================================================*/
      /* If a \ is found, then the next character is ignored */
      /* even if it is a closing quotation mark.             */
      /*=====================================================*/

      if (inchar == '\\')
        {
         pos++;
         inchar = str[pos];
        }

      /*===================================================*/
      /* If the end of input is reached before the closing */
      /* quotation mark is found, the return the last      */
      /* position that was reached and indicate that a     */
      /* complete string was not found.                    */
      /*===================================================*/

      if (inchar == EOS)
        {
         *complete = FALSE;
         return(pos);
        }

      /*================================*/
      /* Move on to the next character. */
      /*================================*/

      pos++;
      inchar = str[pos];
     }

   /*======================================================*/
   /* Indicate that a complete string was found and return */
   /* the position of the closing quotation mark.          */
   /*======================================================*/

   pos++;
   *complete = TRUE;
   return(pos);
  }

/*************************************************************/
/* DoComment: Skips over a comment contained within a string */
/*   until a line feed or carriage return is encountered.    */
/*************************************************************/
static int DoComment(
  char *str,
  int pos)
  {
   int inchar;

   inchar = str[pos];
   while ((inchar != '\n') && (inchar != '\r'))
     {
      if (inchar == EOS)
        { return(pos); }

      pos++;
      inchar = str[pos];
     }

   return(pos);
  }

/**************************************************************/
/* DoWhiteSpace: Skips over white space consisting of spaces, */
/*   tabs, and form feeds that is contained within a string.  */
/**************************************************************/
static int DoWhiteSpace(
  char *str,
  int pos)
  {
   int inchar;

   inchar = str[pos];
   while ((inchar == ' ') || (inchar == '\f') || (inchar == '\t'))
     {
      pos++;
      inchar = str[pos];
     }

   return(pos);
  }

/********************************************************************/
/* CommandLoop: Endless loop which waits for user commands and then */
/*   executes them. The command loop will bypass the EventFunction  */
/*   if there is an active batch file.                              */
/********************************************************************/
globle void CommandLoop(
  void *theEnv)
  {
   int inchar;

   EnvPrintRouter(theEnv,WPROMPT,CommandLineData(theEnv)->BannerString);
   SetHaltExecution(theEnv,FALSE);
   SetEvaluationError(theEnv,FALSE);
   PeriodicCleanup(theEnv,TRUE,FALSE);
   PrintPrompt(theEnv);
   RouterData(theEnv)->CommandBufferInputCount = 0;

   while (TRUE)
     {
      /*===================================================*/
      /* If a batch file is active, grab the command input */
      /* directly from the batch file, otherwise call the  */
      /* event function.                                   */
      /*===================================================*/

      if (BatchActive(theEnv) == TRUE)
        {
         inchar = LLGetcBatch(theEnv,"stdin",TRUE);
         if (inchar == EOF)
           { (*CommandLineData(theEnv)->EventFunction)(theEnv); }
         else
           { ExpandCommandString(theEnv,(char) inchar); }
        }
      else
        { (*CommandLineData(theEnv)->EventFunction)(theEnv); }

      /*=================================================*/
      /* If execution was halted, then remove everything */
      /* from the command buffer.                        */
      /*=================================================*/

      if (GetHaltExecution(theEnv) == TRUE)
        {
         SetHaltExecution(theEnv,FALSE);
         SetEvaluationError(theEnv,FALSE);
         FlushCommandString(theEnv);
#if ! WINDOW_INTERFACE
         fflush(stdin);
#endif
         EnvPrintRouter(theEnv,WPROMPT,"\n");
         PrintPrompt(theEnv);
        }

      /*=========================================*/
      /* If a complete command is in the command */
      /* buffer, then execute it.                */
      /*=========================================*/

      ExecuteIfCommandComplete(theEnv);
     }
  }
  
/***********************************************************/
/* CommandLoopBatch: Loop which waits for commands from a  */
/*   batch file and then executes them. Returns when there */
/*   are no longer any active batch files.                 */
/***********************************************************/
globle void CommandLoopBatch(
  void *theEnv)
  {
   SetHaltExecution(theEnv,FALSE);
   SetEvaluationError(theEnv,FALSE);
   PeriodicCleanup(theEnv,TRUE,FALSE);
   PrintPrompt(theEnv);
   RouterData(theEnv)->CommandBufferInputCount = 0;

   CommandLoopBatchDriver(theEnv);
  }

/************************************************************/
/* CommandLoopOnceThenBatch: Loop which waits for commands  */
/*   from a batch file and then executes them. Returns when */
/*   there are no longer any active batch files.            */
/************************************************************/
globle void CommandLoopOnceThenBatch(
  void *theEnv)
  {
   if (! ExecuteIfCommandComplete(theEnv)) return;

   CommandLoopBatchDriver(theEnv);
  }
  
/*********************************************************/
/* CommandLoopBatchDriver: Loop which waits for commands */
/*   from a batch file and then executes them. Returns   */
/*   when there are no longer any active batch files.    */
/*********************************************************/
globle void CommandLoopBatchDriver(
  void *theEnv)
  {
   int inchar;

   while (TRUE)
     {
      if (GetHaltCommandLoopBatch(theEnv) == TRUE)
        { 
         CloseAllBatchSources(theEnv);
         SetHaltCommandLoopBatch(theEnv,FALSE);
        }
        
      /*===================================================*/
      /* If a batch file is active, grab the command input */
      /* directly from the batch file, otherwise call the  */
      /* event function.                                   */
      /*===================================================*/

      if (BatchActive(theEnv) == TRUE)
        {
         inchar = LLGetcBatch(theEnv,"stdin",TRUE);
         if (inchar == EOF)
           { return; }
         else
           { ExpandCommandString(theEnv,(char) inchar); }
        }
      else
        { return; }

      /*=================================================*/
      /* If execution was halted, then remove everything */
      /* from the command buffer.                        */
      /*=================================================*/

      if (GetHaltExecution(theEnv) == TRUE)
        {
         SetHaltExecution(theEnv,FALSE);
         SetEvaluationError(theEnv,FALSE);
         FlushCommandString(theEnv);
#if ! WINDOW_INTERFACE
         fflush(stdin);
#endif
         EnvPrintRouter(theEnv,WPROMPT,"\n");
         PrintPrompt(theEnv);
        }

      /*=========================================*/
      /* If a complete command is in the command */
      /* buffer, then execute it.                */
      /*=========================================*/

      ExecuteIfCommandComplete(theEnv);
     }
  }

/**********************************************************/
/* ExecuteIfCommandComplete: Checks to determine if there */
/*   is a completed command and if so executes it.        */
/**********************************************************/
globle intBool ExecuteIfCommandComplete(
  void *theEnv)
  {
   if ((CompleteCommand(CommandLineData(theEnv)->CommandString) == 0) || 
       (RouterData(theEnv)->CommandBufferInputCount <= 0))
     { return FALSE; }
     
   if (CommandLineData(theEnv)->BeforeCommandExecutionFunction != NULL)
     { 
      if (! (*CommandLineData(theEnv)->BeforeCommandExecutionFunction)(theEnv))
        { return FALSE; }
     }
       
   FlushPPBuffer(theEnv);
   SetPPBufferStatus(theEnv,OFF);
   RouterData(theEnv)->CommandBufferInputCount = -1;
   RouteCommand(theEnv,CommandLineData(theEnv)->CommandString,TRUE);
   FlushPPBuffer(theEnv);
   SetHaltExecution(theEnv,FALSE);
   SetEvaluationError(theEnv,FALSE);
   FlushCommandString(theEnv);
   FlushBindList(theEnv);
   PeriodicCleanup(theEnv,TRUE,FALSE);
   PrintPrompt(theEnv);
         
   return TRUE;
  }

/*******************************************/
/* CommandCompleteAndNotEmpty: */
/*******************************************/
globle intBool CommandCompleteAndNotEmpty(
  void *theEnv)
  {
   if ((CompleteCommand(CommandLineData(theEnv)->CommandString) == 0) || 
       (RouterData(theEnv)->CommandBufferInputCount <= 0))
     { return FALSE; }
     
   return TRUE;
  }
       
/*******************************************/
/* PrintPrompt: Prints the command prompt. */
/*******************************************/
globle void PrintPrompt(
   void *theEnv)
   {
    EnvPrintRouter(theEnv,WPROMPT,COMMAND_PROMPT);