freebsd-dev/contrib/groff/refer/token.cc
1996-09-07 16:18:32 +00:00

379 lines
8.8 KiB
C++

// -*- 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "refer.h"
#include "token.h"
#define TOKEN_TABLE_SIZE 1009
// I believe in Icelandic thorn sorts after z.
#define THORN_SORT_KEY "{"
struct token_table_entry {
const char *tok;
token_info ti;
token_table_entry();
};
token_table_entry token_table[TOKEN_TABLE_SIZE];
int ntokens = 0;
static void skip_name(const char **ptr, const char *end)
{
if (*ptr < end) {
switch (*(*ptr)++) {
case '(':
if (*ptr < end) {
*ptr += 1;
if (*ptr < end)
*ptr += 1;
}
break;
case '[':
while (*ptr < end)
if (*(*ptr)++ == ']')
break;
break;
}
}
}
int get_token(const char **ptr, const char *end)
{
if (*ptr >= end)
return 0;
char c = *(*ptr)++;
if (c == '\\' && *ptr < end) {
switch (**ptr) {
default:
*ptr += 1;
break;
case '(':
case '[':
skip_name(ptr, end);
break;
case '*':
case 'f':
*ptr += 1;
skip_name(ptr, end);
break;
}
}
return 1;
}
token_info::token_info()
: type(TOKEN_OTHER), sort_key(0), other_case(0)
{
}
void token_info::set(token_type t, const char *sk, const char *oc)
{
assert(oc == 0 || t == TOKEN_UPPER || t == TOKEN_LOWER);
type = t;
sort_key = sk;
other_case = oc;
}
void token_info::sortify(const char *start, const char *end, string &result)
const
{
if (sort_key)
result += sort_key;
else if (type == TOKEN_UPPER || type == TOKEN_LOWER) {
for (; start < end; start++)
if (csalpha(*start))
result += cmlower(*start);
}
}
int token_info::sortify_non_empty(const char *start, const char *end) const
{
if (sort_key)
return *sort_key != '\0';
if (type != TOKEN_UPPER && type != TOKEN_LOWER)
return 0;
for (; start < end; start++)
if (csalpha(*start))
return 1;
return 0;
}
void token_info::lower_case(const char *start, const char *end,
string &result) const
{
if (type != TOKEN_UPPER) {
while (start < end)
result += *start++;
}
else if (other_case)
result += other_case;
else {
while (start < end)
result += cmlower(*start++);
}
}
void token_info::upper_case(const char *start, const char *end,
string &result) const
{
if (type != TOKEN_LOWER) {
while (start < end)
result += *start++;
}
else if (other_case)
result += other_case;
else {
while (start < end)
result += cmupper(*start++);
}
}
token_table_entry::token_table_entry()
: tok(0)
{
}
static void store_token(const char *tok, token_type typ,
const char *sk = 0, const char *oc = 0)
{
unsigned n = hash_string(tok, strlen(tok)) % TOKEN_TABLE_SIZE;
for (;;) {
if (token_table[n].tok == 0) {
if (++ntokens == TOKEN_TABLE_SIZE)
assert(0);
token_table[n].tok = tok;
break;
}
if (strcmp(tok, token_table[n].tok) == 0)
break;
if (n == 0)
n = TOKEN_TABLE_SIZE - 1;
else
--n;
}
token_table[n].ti.set(typ, sk, oc);
}
token_info default_token_info;
const token_info *lookup_token(const char *start, const char *end)
{
unsigned n = hash_string(start, end - start) % TOKEN_TABLE_SIZE;
for (;;) {
if (token_table[n].tok == 0)
break;
if (strlen(token_table[n].tok) == end - start
&& memcmp(token_table[n].tok, start, end - start) == 0)
return &(token_table[n].ti);
if (n == 0)
n = TOKEN_TABLE_SIZE - 1;
else
--n;
}
return &default_token_info;
}
static void init_ascii()
{
const char *p;
for (p = "abcdefghijklmnopqrstuvwxyz"; *p; p++) {
char buf[2];
buf[0] = *p;
buf[1] = '\0';
store_token(strsave(buf), TOKEN_LOWER);
buf[0] = cmupper(buf[0]);
store_token(strsave(buf), TOKEN_UPPER);
}
for (p = "0123456789"; *p; p++) {
char buf[2];
buf[0] = *p;
buf[1] = '\0';
const char *s = strsave(buf);
store_token(s, TOKEN_OTHER, s);
}
for (p = ".,:;?!"; *p; p++) {
char buf[2];
buf[0] = *p;
buf[1] = '\0';
store_token(strsave(buf), TOKEN_PUNCT);
}
store_token("-", TOKEN_HYPHEN);
}
static void store_letter(const char *lower, const char *upper,
const char *sort_key = 0)
{
store_token(lower, TOKEN_LOWER, sort_key, upper);
store_token(upper, TOKEN_UPPER, sort_key, lower);
}
static void init_letter(unsigned char uc_code, unsigned char lc_code,
const char *sort_key)
{
char lbuf[2];
lbuf[0] = lc_code;
lbuf[1] = 0;
char ubuf[2];
ubuf[0] = uc_code;
ubuf[1] = 0;
store_letter(strsave(lbuf), strsave(ubuf), sort_key);
}
static void init_latin1()
{
init_letter(0xc0, 0xe0, "a");
init_letter(0xc1, 0xe1, "a");
init_letter(0xc2, 0xe2, "a");
init_letter(0xc3, 0xe3, "a");
init_letter(0xc4, 0xe4, "a");
init_letter(0xc5, 0xe5, "a");
init_letter(0xc6, 0xe6, "ae");
init_letter(0xc7, 0xe7, "c");
init_letter(0xc8, 0xe8, "e");
init_letter(0xc9, 0xe9, "e");
init_letter(0xca, 0xea, "e");
init_letter(0xcb, 0xeb, "e");
init_letter(0xcc, 0xec, "i");
init_letter(0xcd, 0xed, "i");
init_letter(0xce, 0xee, "i");
init_letter(0xcf, 0xef, "i");
init_letter(0xd0, 0xf0, "d");
init_letter(0xd1, 0xf1, "n");
init_letter(0xd2, 0xf2, "o");
init_letter(0xd3, 0xf3, "o");
init_letter(0xd4, 0xf4, "o");
init_letter(0xd5, 0xf5, "o");
init_letter(0xd6, 0xf6, "o");
init_letter(0xd8, 0xf8, "o");
init_letter(0xd9, 0xf9, "u");
init_letter(0xda, 0xfa, "u");
init_letter(0xdb, 0xfb, "u");
init_letter(0xdc, 0xfc, "u");
init_letter(0xdd, 0xfd, "y");
init_letter(0xde, 0xfe, THORN_SORT_KEY);
store_token("\337", TOKEN_LOWER, "ss", "SS");
store_token("\377", TOKEN_LOWER, "y", "Y");
}
static void init_two_char_letter(char l1, char l2, char u1, char u2,
const char *sk = 0)
{
char buf[6];
buf[0] = '\\';
buf[1] = '(';
buf[2] = l1;
buf[3] = l2;
buf[4] = '\0';
const char *p = strsave(buf);
buf[2] = u1;
buf[3] = u2;
store_letter(p, strsave(buf), sk);
buf[1] = '[';
buf[4] = ']';
buf[5] = '\0';
p = strsave(buf);
buf[2] = l1;
buf[3] = l2;
store_letter(strsave(buf), p, sk);
}
static void init_special_chars()
{
const char *p;
for (p = "':^`~"; *p; p++)
for (const char *q = "aeiouy"; *q; q++) {
// Use a variable to work around bug in gcc 2.0
char c = cmupper(*q);
init_two_char_letter(*p, *q, *p, c);
}
for (p = "/l/o~n,coeaeij"; *p; p += 2) {
// Use variables to work around bug in gcc 2.0
char c0 = cmupper(p[0]);
char c1 = cmupper(p[1]);
init_two_char_letter(p[0], p[1], c0, c1);
}
init_two_char_letter('v', 's', 'v', 'S', "s");
init_two_char_letter('v', 'z', 'v', 'Z', "z");
init_two_char_letter('o', 'a', 'o', 'A', "a");
init_two_char_letter('T', 'p', 'T', 'P', THORN_SORT_KEY);
init_two_char_letter('-', 'd', '-', 'D');
store_token("\\(ss", TOKEN_LOWER, 0, "SS");
store_token("\\[ss]", TOKEN_LOWER, 0, "SS");
store_token("\\(Sd", TOKEN_LOWER, "d", "\\(-D");
store_token("\\[Sd]", TOKEN_LOWER, "d", "\\[-D]");
store_token("\\(hy", TOKEN_HYPHEN);
store_token("\\[hy]", TOKEN_HYPHEN);
store_token("\\(en", TOKEN_RANGE_SEP);
store_token("\\[en]", TOKEN_RANGE_SEP);
}
static void init_strings()
{
char buf[6];
buf[0] = '\\';
buf[1] = '*';
for (const char *p = "'`^^,:~v_o./;"; *p; p++) {
buf[2] = *p;
buf[3] = '\0';
store_token(strsave(buf), TOKEN_ACCENT);
buf[2] = '[';
buf[3] = *p;
buf[4] = ']';
buf[5] = '\0';
store_token(strsave(buf), TOKEN_ACCENT);
}
// -ms special letters
store_letter("\\*(th", "\\*(Th", THORN_SORT_KEY);
store_letter("\\*[th]", "\\*[Th]", THORN_SORT_KEY);
store_letter("\\*(d-", "\\*(D-");
store_letter("\\*[d-]", "\\*[D-]");
store_letter("\\*(ae", "\\*(Ae", "ae");
store_letter("\\*[ae]", "\\*[Ae]", "ae");
store_letter("\\*(oe", "\\*(Oe", "oe");
store_letter("\\*[oe]", "\\*[Oe]", "oe");
store_token("\\*3", TOKEN_LOWER, "y", "Y");
store_token("\\*8", TOKEN_LOWER, "ss", "SS");
store_token("\\*q", TOKEN_LOWER, "o", "O");
}
struct token_initer {
token_initer();
};
static token_initer the_token_initer;
token_initer::token_initer()
{
init_ascii();
init_latin1();
init_special_chars();
init_strings();
default_token_info.set(TOKEN_OTHER);
}