utils/wvstringmask.cc

   1 /* -*- Mode: C++ -*-
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 2005 Net Integration Technologies, Inc.
   4  *
   5  * Implementation of an efficient lookup for a set characters.
   6  *
   7  * It is, however, a little space intensive, but you should statically
   8  * create them in your functions, and then they won't be so bad.
   9  */
  10 #include "wvstringmask.h"
  11
  12 WvStringMask::WvStringMask(WvStringParm s)
  13 {
  14     zap();
  15     set(s, true);
  16 }
  17
  18 WvStringMask::WvStringMask(char c)
  19 {
  20     zap();
  21     set(c, true);
  22 }
  23
  24 bool WvStringMask::operator[](const char c) const
  25 {
  26     unsigned char uc = c;
  27     return _set[uc];
  28 }
  29
  30 const char WvStringMask::first() const
  31 {
  32     return _first;
  33 }
  34
  35 void WvStringMask::zap()
  36 {
  37     memset(_set, 0, sizeof(bool) * sizeof(_set));
  38     _first = '\0';
  39 }
  40
  41 void WvStringMask::set(const char c, bool value)
  42 {
  43     if (!_first)
  44         _first = c;
  45
  46     _set[unsigned(c)] = value;
  47 }
  48
  49 void WvStringMask::set(WvStringParm s, bool value)
  50 {
  51     if (!s.isnull())
  52     {
  53         const char *c = s.cstr();
  54
  55         if (!_first)
  56             _first = *c;
  57
  58         while (*c)
  59         {
  60             _set[unsigned(*c)] = value;
  61             ++c;
  62         }
  63     }
  64 }