c_comment.gsp

This is the verbatim text of the file "c_comment.gsp" part of the LLOOP package. The copyright remains with Michel MEHL. All rights reserved.

/**
 * Pre-processes C comments.
 * Strips the input of any C comment,
 * but regardless of whether the comment is within quotes.
 */

preprocessor c_comment 
{{
  static bool bInComment = false;
  static char cPrev = 0;

  if (bInComment)
    {
      if ((cPrev == '*') && (c == '/'))
	{
	  bInComment = false;
	  discard();
	}
      else if (c != '\n') // Keep the new lines for the line count
	{
	  discard();
	}
    }
  else if ( (cPrev == '/') && (c == '*') ) // Comment detected
    {
      /* The previous char is a slash and the current is a star.
       * This means a C comment start is detected.
       * The / char has actually already been accepted in the previous step. 
       * It is cancelled by moving back of one char in the pre-processed stream
       * using the parser.pstream().seekp(-1,ios::cur)
       * Note that parser.pstream() returns the pre-processed stream. 
       */

      bInComment = true;
      parser.pstream().seekp(-1,ios::cur); // Remove the '/' read before
      discard();
    }

  cPrev =  c;
}}

This file is part of the LLOOP Reversible Object-Oriented Parser Generator. Copyright (c) 2005-2006 Michel MEHL, France. All rights reserved. LLOOP is distributed by the company ERSA SaRL.