home *** CD-ROM | disk | FTP | other *** search
- // -*- C++ -*-
- /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
- Written by James Clark (jjc@jclark.com)
-
- This file is part of groff.
-
- groff is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 2, or (at your option) any later
- version.
-
- groff is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License along
- with groff; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include <stdio.h>
- #include </gnu/include/string.h>
- #include <ctype.h>
- #include <assert.h>
- #include <stdlib.h>
- #include "lib.h"
- #include "errarg.h"
- #include "error.h"
- #include "font.h"
- #include "ptable.h"
-
- declare_ptable(int)
- implement_ptable(int)
-
- class character_indexer {
- public:
- character_indexer();
- ~character_indexer();
- int ascii_char_index(unsigned char);
- int named_char_index(const char *);
- int numbered_char_index(int);
- private:
- enum { NSMALL = 256 };
- int next_index;
- int ascii_index[256];
- int small_number_index[NSMALL];
- PTABLE(int) table;
- int lookup_char(const char *, int);
- };
-
- character_indexer::character_indexer()
- : next_index(0)
- {
- for (int i = 0; i < 256; i++)
- ascii_index[i] = -1;
- for (i = 0; i < NSMALL; i++)
- small_number_index[i] = -1;
- }
-
- character_indexer::~character_indexer()
- {
- }
-
- int character_indexer::ascii_char_index(unsigned char c)
- {
- if (ascii_index[c] < 0)
- ascii_index[c] = next_index++;
- return ascii_index[c];
- }
-
- int character_indexer::numbered_char_index(int n)
- {
- if (n >= 0 && n < NSMALL) {
- if (small_number_index[n] < 0)
- small_number_index[n] = next_index++;
- return small_number_index[n];
- }
- // Not the most efficient possible implementation.
- char buf[INT_DIGITS + 3];
- buf[0] = ' ';
- strcpy(buf + 1, itoa(n));
- return named_char_index(buf);
- }
-
- int character_indexer::named_char_index(const char *s)
- {
- int *np = table.lookup(s);
- if (!np) {
- np = new int;
- *np = next_index++;
- table.define(s, np);
- }
- return *np;
- }
-
- static character_indexer indexer;
-
- int font::number_to_index(int n)
- {
- return indexer.numbered_char_index(n);
- }
-
- int font::name_to_index(const char *s)
- {
- assert(s != 0 && s[0] != '\0' && s[0] != ' ');
- if (s[1] == '\0')
- return indexer.ascii_char_index(s[0]);
- /* char128 and \200 are synonyms */
- if (s[0] == 'c' && s[1] == 'h' && s[2] == 'a' && s[3] == 'r') {
- char *res;
- long n = strtol(s + 4, &res, 10);
- if (res != s + 4 && *res == '\0' && n >= 0 && n < 256)
- return indexer.ascii_char_index((unsigned char)n);
- }
- return indexer.named_char_index(s);
- }
-
-