371 lines
8.7 KiB
C++
371 lines
8.7 KiB
C++
// -*- C++ -*-
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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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Written by James Clark (jjc@jclark.com)
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This file is part of groff.
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groff is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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groff is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with groff; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "refer.h"
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#include "token.h"
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#define TOKEN_TABLE_SIZE 1009
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// I believe in Icelandic thorn sorts after z.
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#define THORN_SORT_KEY "{"
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struct token_table_entry {
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const char *tok;
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token_info ti;
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token_table_entry();
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};
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token_table_entry token_table[TOKEN_TABLE_SIZE];
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int ntokens = 0;
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static void skip_name(const char **ptr, const char *end)
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{
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if (*ptr < end) {
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switch (*(*ptr)++) {
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case '(':
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if (*ptr < end) {
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*ptr += 1;
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if (*ptr < end)
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*ptr += 1;
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}
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break;
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case '[':
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while (*ptr < end)
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if (*(*ptr)++ == ']')
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break;
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break;
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}
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}
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}
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int get_token(const char **ptr, const char *end)
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{
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if (*ptr >= end)
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return 0;
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char c = *(*ptr)++;
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if (c == '\\' && *ptr < end) {
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switch (**ptr) {
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default:
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*ptr += 1;
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break;
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case '(':
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case '[':
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skip_name(ptr, end);
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break;
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case '*':
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case 'f':
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*ptr += 1;
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skip_name(ptr, end);
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break;
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}
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}
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return 1;
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}
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token_info::token_info()
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: type(TOKEN_OTHER), sort_key(0), other_case(0)
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{
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}
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void token_info::set(token_type t, const char *sk, const char *oc)
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{
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assert(oc == 0 || t == TOKEN_UPPER || t == TOKEN_LOWER);
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type = t;
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sort_key = sk;
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other_case = oc;
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}
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void token_info::sortify(const char *start, const char *end, string &result)
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const
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{
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if (sort_key)
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result += sort_key;
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else if (type == TOKEN_UPPER || type == TOKEN_LOWER) {
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for (; start < end; start++)
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if (csalpha(*start))
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result += cmlower(*start);
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}
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}
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int token_info::sortify_non_empty(const char *start, const char *end) const
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{
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if (sort_key)
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return *sort_key != '\0';
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if (type != TOKEN_UPPER && type != TOKEN_LOWER)
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return 0;
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for (; start < end; start++)
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if (csalpha(*start))
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return 1;
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return 0;
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}
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void token_info::lower_case(const char *start, const char *end,
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string &result) const
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{
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if (type != TOKEN_UPPER) {
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while (start < end)
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result += *start++;
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}
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else if (other_case)
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result += other_case;
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else {
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while (start < end)
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result += cmlower(*start++);
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}
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}
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void token_info::upper_case(const char *start, const char *end,
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string &result) const
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{
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if (type != TOKEN_LOWER) {
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while (start < end)
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result += *start++;
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}
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else if (other_case)
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result += other_case;
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else {
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while (start < end)
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result += cmupper(*start++);
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}
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}
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token_table_entry::token_table_entry()
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: tok(0)
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{
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}
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static void store_token(const char *tok, token_type typ,
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const char *sk = 0, const char *oc = 0)
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{
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unsigned n = hash_string(tok, strlen(tok)) % TOKEN_TABLE_SIZE;
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while (n >= 0) {
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if (token_table[n].tok == 0) {
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if (++ntokens == TOKEN_TABLE_SIZE)
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assert(0);
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token_table[n].tok = tok;
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break;
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}
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if (strcmp(tok, token_table[n].tok) == 0)
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break;
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if (--n < 0)
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n = TOKEN_TABLE_SIZE - 1;
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}
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token_table[n].ti.set(typ, sk, oc);
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}
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token_info default_token_info;
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const token_info *lookup_token(const char *start, const char *end)
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{
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unsigned n = hash_string(start, end - start) % TOKEN_TABLE_SIZE;
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while (n >= 0) {
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if (token_table[n].tok == 0)
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break;
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if (strlen(token_table[n].tok) == end - start
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&& memcmp(token_table[n].tok, start, end - start) == 0)
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return &(token_table[n].ti);
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if (--n < 0)
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n = TOKEN_TABLE_SIZE - 1;
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}
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return &default_token_info;
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}
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static void init_ascii()
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{
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const char *p; for (p = "abcdefghijklmnopqrstuvwxyz"; *p; p++) {
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char buf[2];
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buf[0] = *p;
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buf[1] = '\0';
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store_token(strsave(buf), TOKEN_LOWER);
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buf[0] = cmupper(buf[0]);
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store_token(strsave(buf), TOKEN_UPPER);
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}
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for (p = "0123456789"; *p; p++) {
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char buf[2];
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buf[0] = *p;
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buf[1] = '\0';
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const char *s = strsave(buf);
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store_token(s, TOKEN_OTHER, s);
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}
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for (p = ".,:;?!"; *p; p++) {
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char buf[2];
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buf[0] = *p;
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buf[1] = '\0';
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store_token(strsave(buf), TOKEN_PUNCT);
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}
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store_token("-", TOKEN_HYPHEN);
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}
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static void store_letter(const char *lower, const char *upper,
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const char *sort_key = 0)
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{
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store_token(lower, TOKEN_LOWER, sort_key, upper);
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store_token(upper, TOKEN_UPPER, sort_key, lower);
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}
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static void init_letter(unsigned char uc_code, unsigned char lc_code,
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const char *sort_key)
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{
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char lbuf[2];
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lbuf[0] = lc_code;
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lbuf[1] = 0;
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char ubuf[2];
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ubuf[0] = uc_code;
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ubuf[1] = 0;
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store_letter(strsave(lbuf), strsave(ubuf), sort_key);
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}
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static void init_latin1()
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{
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init_letter(0xc0, 0xe0, "a");
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init_letter(0xc1, 0xe1, "a");
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init_letter(0xc2, 0xe2, "a");
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init_letter(0xc3, 0xe3, "a");
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init_letter(0xc4, 0xe4, "a");
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init_letter(0xc5, 0xe5, "a");
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init_letter(0xc6, 0xe6, "ae");
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init_letter(0xc7, 0xe7, "c");
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init_letter(0xc8, 0xe8, "e");
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init_letter(0xc9, 0xe9, "e");
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init_letter(0xca, 0xea, "e");
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init_letter(0xcb, 0xeb, "e");
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init_letter(0xcc, 0xec, "i");
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init_letter(0xcd, 0xed, "i");
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init_letter(0xce, 0xee, "i");
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init_letter(0xcf, 0xef, "i");
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init_letter(0xd0, 0xf0, "d");
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init_letter(0xd1, 0xf1, "n");
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init_letter(0xd2, 0xf2, "o");
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init_letter(0xd3, 0xf3, "o");
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init_letter(0xd4, 0xf4, "o");
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init_letter(0xd5, 0xf5, "o");
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init_letter(0xd6, 0xf6, "o");
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init_letter(0xd8, 0xf8, "o");
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init_letter(0xd9, 0xf9, "u");
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init_letter(0xda, 0xfa, "u");
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init_letter(0xdb, 0xfb, "u");
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init_letter(0xdc, 0xfc, "u");
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init_letter(0xdd, 0xfd, "y");
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init_letter(0xde, 0xfe, THORN_SORT_KEY);
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store_token("\337", TOKEN_LOWER, "ss", "SS");
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store_token("\377", TOKEN_LOWER, "y", "Y");
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}
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static void init_two_char_letter(char l1, char l2, char u1, char u2,
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const char *sk = 0)
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{
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char buf[6];
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buf[0] = '\\';
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buf[1] = '(';
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buf[2] = l1;
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buf[3] = l2;
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buf[4] = '\0';
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const char *p = strsave(buf);
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buf[2] = u1;
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buf[3] = u2;
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store_letter(p, strsave(buf), sk);
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buf[1] = '[';
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buf[4] = ']';
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buf[5] = '\0';
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p = strsave(buf);
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buf[2] = l1;
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buf[3] = l2;
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store_letter(strsave(buf), p, sk);
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}
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static void init_special_chars()
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{
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const char *p; for (p = "':^`~"; *p; p++)
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for (const char *q = "aeiouy"; *q; q++) {
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// Use a variable to work around bug in gcc 2.0
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char c = cmupper(*q);
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init_two_char_letter(*p, *q, *p, c);
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}
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for (p = "/l/o~n,coeaeij"; *p; p += 2) {
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// Use variables to work around bug in gcc 2.0
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char c0 = cmupper(p[0]);
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char c1 = cmupper(p[1]);
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init_two_char_letter(p[0], p[1], c0, c1);
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}
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init_two_char_letter('v', 's', 'v', 'S', "s");
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init_two_char_letter('v', 'z', 'v', 'Z', "z");
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init_two_char_letter('o', 'a', 'o', 'A', "a");
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init_two_char_letter('T', 'p', 'T', 'P', THORN_SORT_KEY);
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init_two_char_letter('-', 'd', '-', 'D');
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store_token("\\(ss", TOKEN_LOWER, 0, "SS");
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store_token("\\[ss]", TOKEN_LOWER, 0, "SS");
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store_token("\\(Sd", TOKEN_LOWER, "d", "\\(-D");
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store_token("\\[Sd]", TOKEN_LOWER, "d", "\\[-D]");
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store_token("\\(hy", TOKEN_HYPHEN);
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store_token("\\[hy]", TOKEN_HYPHEN);
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}
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static void init_strings()
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{
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char buf[6];
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buf[0] = '\\';
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buf[1] = '*';
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for (const char *p = "'`^^,:~v_o./;"; *p; p++) {
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buf[2] = *p;
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buf[3] = '\0';
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store_token(strsave(buf), TOKEN_ACCENT);
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buf[2] = '[';
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buf[3] = *p;
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buf[4] = ']';
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buf[5] = '\0';
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store_token(strsave(buf), TOKEN_ACCENT);
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}
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// -ms special letters
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store_letter("\\*(th", "\\*(Th", THORN_SORT_KEY);
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store_letter("\\*[th]", "\\*[Th]", THORN_SORT_KEY);
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store_letter("\\*(d-", "\\*(D-");
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store_letter("\\*[d-]", "\\*[D-]");
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store_letter("\\*(ae", "\\*(Ae", "ae");
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store_letter("\\*[ae]", "\\*[Ae]", "ae");
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store_letter("\\*(oe", "\\*(Oe", "oe");
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store_letter("\\*[oe]", "\\*[Oe]", "oe");
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store_token("\\*3", TOKEN_LOWER, "y", "Y");
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store_token("\\*8", TOKEN_LOWER, "ss", "SS");
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store_token("\\*q", TOKEN_LOWER, "o", "O");
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}
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struct token_initer {
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token_initer();
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};
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static token_initer the_token_initer;
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token_initer::token_initer()
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{
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init_ascii();
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init_latin1();
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init_special_chars();
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init_strings();
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default_token_info.set(TOKEN_OTHER);
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}
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