discreteset.h

用于词法分析的词法分析器

/*
  $Id: DiscreteSet.h,v 1.4 1997/05/19 02:24:05 matt Exp $
  
  Basic discrete set implemented as a byte array.
  
  (c) Apr 95 Matt Phillips 
  */

#ifndef _DISCSET_H
#define _DISCSET_H

#ifndef __GNUC__
#  include <mem.h>
#endif

#include "checks.h"
#include "Range.h"

#define DSET_INCHECK(i) CHECK (i >= LOWER && i <= UPPER, "item outside set")

template <class T, int LOWER, int UPPER>
class DiscreteSet
{
public:

  DiscreteSet () {removeAll ();}

  void addAll () {memset (data, 1, sizeof (data));}
  void removeAll () {memset (data, 0, sizeof (data));}

  void add (T i) {DSET_INCHECK (i); data [i] = 1;}
  void add (const Range<T> &r) {set (r, 1);}

  void remove (const Range<T> &r) {set (r, 0);}
  void remove (T i) {DSET_INCHECK (i); data [i] = 0;}

  void set (T i, int b) {DSET_INCHECK (i); data [i] = b;}
  void set (const Range<T> &r, int b)
  {
    DSET_INCHECK (r.lower);
    DSET_INCHECK (r.upper);
    memset (data + r.lower, b, r.length ());
  }

  int isIn (T i) const {DSET_INCHECK (i); return data [i];}

  static T getLower () {return (T)LOWER;}
  static T getUpper () {return (T)UPPER;}
  static int inRange (T i) {return i >= LOWER && i <= UPPER;}
   
protected:

  char data [UPPER - LOWER + 1];
};
#endif