ref: 93691381ddd563a675b962970ea135bc89489dd4
dir: /hyph.c/
/* hyphenation */
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "roff.h"
#include "hyen.h"
#define HYPATLEN (NHYPHS * 16) /* hyphenation pattern length */
static int hcode_mapchar(char *s);
/* the hyphenation dictionary (.hw) */
static char hwword[HYPATLEN]; /* buffer for .hw words */
static char hwhyph[HYPATLEN]; /* buffer for .hw hyphenations */
static int hwword_len; /* used hwword[] length */
static struct dict hwdict; /* map words to their index in hwoff[] */
static int hwoff[NHYPHS]; /* the offset of this word in hwword[] */
static int hwlen[NHYPHS]; /* the length of the word */
static int hw_n; /* number of words in hw_*[] lists */
/* functions for the hyphenation dictionary */
static void hw_add(char *word)
{
char *s = word;
char *d = hwword + hwword_len;
int c, i;
if (hw_n == LEN(hwoff) || hwword_len + 128 > sizeof(hwword))
return;
i = hw_n++;
while ((c = *s++)) {
if (c == '-')
hwhyph[d - hwword] = 1;
else
*d++ = c;
}
*d++ = '\0';
hwoff[i] = hwword_len;
hwword_len = d - hwword;
hwlen[i] = hwword_len - hwoff[i] - 1;
dict_put(&hwdict, hwword + hwoff[i], i);
}
/* copy s to d after .hcode mappings; s[map[j]] corresponds to d[j] */
static void hw_strcpy(char *d, char *s, int *map)
{
int di = 0, si = 0, len;
while (s[si]) {
len = utf8len((unsigned char) s[si]);
map[di] = si;
memcpy(d + di, s + si, len);
si += len;
di += hcode_mapchar(d + di);
}
d[di] = '\0';
}
static int hw_lookup(char *word, char *hyph)
{
char word2[WORDLEN] = {0};
char *hyph2;
int map[WORDLEN] = {0};
int i, j, idx = -1;
hw_strcpy(word2, word, map);
i = dict_prefix(&hwdict, word2, &idx);
if (i < 0)
return 1;
hyph2 = hwhyph + hwoff[i];
for (j = 0; word2[j]; j++)
if (hyph2[j])
hyph[map[j]] = hyph2[j];
return 0;
}
void tr_hw(char **args)
{
int i;
for (i = 1; i < NARGS && args[i]; i++)
hw_add(args[i]);
}
/* the tex hyphenation algorithm */
static int hyinit; /* hyphenation data initialized */
static char hypats[HYPATLEN]; /* the patterns */
static char hynums[HYPATLEN]; /* numbers in the patterns */
static int hypats_len;
static struct dict hydict; /* map patterns to their index in hyoff[] */
static int hyoff[NHYPHS]; /* the offset of this pattern in hypats[] */
static int hy_n; /* number of words in hy_*[] lists */
/* copy s to d after .hcode mappings; s[map[j]] corresponds to d[j] */
static void hy_strcpy(char *d, char *s, int *map)
{
int di = 0, si = 0, len;
d[di++] = '.';
while (s[si]) {
len = utf8len((unsigned char) s[si]);
map[di] = si;
memcpy(d + di, s + si, len);
si += len;
di += hcode_mapchar(d + di);
}
d[di++] = '.';
d[di] = '\0';
}
/* find the patterns matching s and update hyphenation values in n */
static void hy_find(char *s, char *n)
{
int plen;
char *p, *np;
int i, j;
int idx = -1;
while ((i = dict_prefix(&hydict, s, &idx)) >= 0) {
p = hypats + hyoff[i];
np = hynums + (p - hypats);
plen = strlen(p);
for (j = 0; j < plen; j++)
if (n[j] < np[j])
n[j] = np[j];
}
}
/* mark the hyphenation points of word in hyph */
static void hy_dohyph(char *hyph, char *word, int flg)
{
char n[WORDLEN] = {0};
char w[WORDLEN] = {0};
int c[WORDLEN]; /* start of the i-th character in w */
int wmap[WORDLEN] = {0}; /* word[wmap[i]] is w[i] */
int nc = 0;
int i, wlen;
hy_strcpy(w, word, wmap);
wlen = strlen(w);
for (i = 0; i < wlen - 1; i += utf8len((unsigned int) w[i]))
c[nc++] = i;
for (i = 0; i < nc - 1; i++)
hy_find(w + c[i], n + c[i]);
memset(hyph, 0, wlen * sizeof(hyph[0]));
for (i = 3; i < nc - 2; i++)
if (n[i] % 2 && w[c[i - 1]] != '.' && w[c[i - 2]] != '.' && w[c[i + 1]] != '.')
hyph[wmap[c[i]]] = (~flg & HY_FINAL2 || w[c[i + 2]] != '.') &&
(~flg & HY_FIRST2 || w[c[i - 3]] != '.');
}
/* insert pattern s into hypats[] and hynums[] */
static void hy_add(char *s)
{
char *p = hypats + hypats_len;
char *n = hynums + hypats_len;
int i = 0, idx;
if (hy_n >= NHYPHS || hypats_len + 64 >= sizeof(hypats))
return;
idx = hy_n++;
while (*s) {
if (*s >= '0' && *s <= '9')
n[i] = *s++ - '0';
else
p[i++] = *s++;
}
p[i] = '\0';
hyoff[idx] = hypats_len;
dict_put(&hydict, hypats + hyoff[idx], idx);
hypats_len += i + 1;
}
/* .hcode request */
static struct dict hcodedict;
static char hcodesrc[NHCODES][GNLEN];
static char hcodedst[NHCODES][GNLEN];
static int hcode_n;
/* replace the character in s after .hcode mapping; returns s's new length */
static int hcode_mapchar(char *s)
{
int i = dict_get(&hcodedict, s);
if (i >= 0)
strcpy(s, hcodedst[i]);
else if (isalpha((unsigned char) *s))
*s = tolower(*s);
return strlen(s);
}
void tr_hcode(char **args)
{
int i = 1;
while (i + 1 <= NARGS && args[i + 1] && hcode_n < NHCODES) {
strcpy(hcodesrc[hcode_n], args[i++]);
strcpy(hcodedst[hcode_n], args[i++]);
dict_put(&hcodedict, hcodesrc[hcode_n], hcode_n);
hcode_n++;
}
}
static void hyph_readpatterns(char *s)
{
char word[WORDLEN];
char *d;
while (*s) {
d = word;
while (*s && !isspace((unsigned char) *s))
*d++ = *s++;
*d = '\0';
hy_add(word);
while (*s && isspace((unsigned char) *s))
s++;
}
}
static void hyph_readexceptions(char *s)
{
char word[WORDLEN];
char *d;
while (*s) {
d = word;
while (*s && !isspace((unsigned char) *s))
*d++ = *s++;
*d = '\0';
hw_add(word);
while (*s && isspace((unsigned char) *s))
s++;
}
}
void hyphenate(char *hyph, char *word, int flg)
{
if (!hyinit) {
hyinit = 1;
hyph_readpatterns(en_patterns);
hyph_readexceptions(en_exceptions);
}
if (hw_lookup(word, hyph))
hy_dohyph(hyph, word, flg);
}
void tr_hpfa(char **args)
{
char tok[ILNLEN];
FILE *filp;
hyinit = 1;
/* load english hyphenation patterns with no arguments */
if (!args[1]) {
hyph_readpatterns(en_patterns);
hyph_readexceptions(en_exceptions);
}
/* reading patterns */
if (args[1]) {
filp = fopen(args[1], "r");
while (fscanf(filp, "%s", tok) == 1)
if (strlen(tok) < WORDLEN)
hy_add(tok);
fclose(filp);
}
/* reading exceptions */
if (args[2]) {
filp = fopen(args[1], "r");
while (fscanf(filp, "%s", tok) == 1)
if (strlen(tok) < WORDLEN)
hw_add(tok);
fclose(filp);
}
}
void hyph_init(void)
{
dict_init(&hwdict, NHYPHS, -1, 0, 1);
dict_init(&hydict, NHYPHS, -1, 0, 1);
dict_init(&hcodedict, NHYPHS, -1, 0, 1);
}
void tr_hpf(char **args)
{
/* reseting the patterns */
hypats_len = 0;
hy_n = 0;
dict_done(&hydict);
/* reseting the dictionary */
hwword_len = 0;
hw_n = 0;
dict_done(&hwdict);
/* reading */
hyph_init();
tr_hpfa(args);
}