2 /* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
4 Written by James Clark (jjc@jclark.com)
6 This file is part of groff.
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
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
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. */
35 class character_indexer {
39 int ascii_char_index(unsigned char);
40 int named_char_index(const char *);
41 int numbered_char_index(int);
43 enum { NSMALL = 256 };
46 int small_number_index[NSMALL];
50 character_indexer::character_indexer()
54 for (i = 0; i < 256; i++)
56 for (i = 0; i < NSMALL; i++)
57 small_number_index[i] = -1;
60 character_indexer::~character_indexer()
64 int character_indexer::ascii_char_index(unsigned char c)
66 if (ascii_index[c] < 0)
67 ascii_index[c] = next_index++;
68 return ascii_index[c];
71 int character_indexer::numbered_char_index(int n)
73 if (n >= 0 && n < NSMALL) {
74 if (small_number_index[n] < 0)
75 small_number_index[n] = next_index++;
76 return small_number_index[n];
78 // Not the most efficient possible implementation.
79 char buf[INT_DIGITS + 3];
81 strcpy(buf + 1, i_to_a(n));
82 return named_char_index(buf);
85 int character_indexer::named_char_index(const char *s)
87 int *np = table.lookup(s);
96 static character_indexer indexer;
98 int font::number_to_index(int n)
100 return indexer.numbered_char_index(n);
103 int font::name_to_index(const char *s)
105 assert(s != 0 && s[0] != '\0' && s[0] != ' ');
107 return indexer.ascii_char_index(s[0]);
108 /* char128 and \200 are synonyms */
109 if (s[0] == 'c' && s[1] == 'h' && s[2] == 'a' && s[3] == 'r') {
111 long n = strtol(s + 4, &val, 10);
112 if (val != s + 4 && *val == '\0' && n >= 0 && n < 256)
113 return indexer.ascii_char_index((unsigned char)n);
115 return indexer.named_char_index(s);