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