gnu/dist/groff/src/include/symbol.h

   1 /*      $NetBSD$        */
   2
   3 // -*- C++ -*-
   4 /* Copyright (C) 1989, 1990, 1991, 1992, 2002, 2004
   5    Free Software Foundation, Inc.
   6      Written by James Clark (jjc@jclark.com)
   7
   8 This file is part of groff.
   9
  10 groff is free software; you can redistribute it and/or modify it under
  11 the terms of the GNU General Public License as published by the Free
  12 Software Foundation; either version 2, or (at your option) any later
  13 version.
  14
  15 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18 for more details.
  19
  20 You should have received a copy of the GNU General Public License along
  21 with groff; see the file COPYING.  If not, write to the Free Software
  22 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
  23
  24 #define DONT_STORE 1
  25 #define MUST_ALREADY_EXIST 2
  26
  27 class symbol {
  28   static const char **table;
  29   static int table_used;
  30   static int table_size;
  31   static char *block;
  32   static int block_size;
  33   const char *s;
  34 public:
  35   symbol(const char *p, int how = 0);
  36   symbol();
  37   unsigned long hash() const;
  38   int operator ==(symbol) const;
  39   int operator !=(symbol) const;
  40   const char *contents() const;
  41   int is_null() const;
  42   int is_empty() const;
  43 };
  44
  45
  46 extern const symbol NULL_SYMBOL;
  47 extern const symbol EMPTY_SYMBOL;
  48
  49 inline symbol::symbol() : s(0)
  50 {
  51 }
  52
  53 inline int symbol::operator==(symbol p) const
  54 {
  55   return s == p.s;
  56 }
  57
  58 inline int symbol::operator!=(symbol p) const
  59 {
  60   return s != p.s;
  61 }
  62
  63 inline unsigned long symbol::hash() const
  64 {
  65   return (unsigned long)s;
  66 }
  67
  68 inline const char *symbol::contents() const
  69 {
  70   return s;
  71 }
  72
  73 inline int symbol::is_null() const
  74 {
  75   return s == 0;
  76 }
  77
  78 inline int symbol::is_empty() const
  79 {
  80   return s != 0 && *s == 0;
  81 }
  82
  83 symbol concat(symbol, symbol);
  84
  85 extern symbol default_symbol;