ref: ba2d79127881030e079be609d77df850b660dd2d
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 */
/* 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 lower-cased s to d */
static void hw_strcpy(char *d, char *s)
{
while (*s) {
if (*s & 0x80)
*d++ = *s++;
else
*d++ = tolower(*s++);
}
*d = '\0';
}
static char *hw_lookup(char *s)
{
char word[ILNLEN];
int i, idx = -1;
hw_strcpy(word, s);
i = dict_prefix(&hwdict, s, &idx);
return i >= 0 ? hwhyph + hwoff[i] : NULL;
}
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 */
/* make s lower-case and replace its non-alphabetic characters with . */
static void hy_strcpy(char *d, char *s)
{
int c;
*d++ = '.';
while ((c = (unsigned char) *s++))
*d++ = c & 0x80 ? c : (isalpha(c) ? tolower(c) : '.');
*d++ = '.';
*d = '\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[ILNLEN] = {0};
char w[ILNLEN];
int c[ILNLEN]; /* start of the i-th character in w */
int nc = 0;
int i, wlen;
hy_strcpy(w, word);
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[c[i - 1]] = (~flg & HY_FINAL2 || w[c[i + 2]] != '.') &&
(~flg & HY_FIRST2 || w[c[i - 3]] != '.');
}
/* insert pattern s into hypats[] and hynums[] */
static void hy_ins(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;
}
static void hyph_readpatterns(char *s)
{
char word[ILNLEN];
char *d;
while (*s) {
d = word;
while (*s && !isspace((unsigned char) *s))
*d++ = *s++;
*d = '\0';
hy_ins(word);
while (*s && isspace((unsigned char) *s))
s++;
}
}
static void hyph_readexceptions(char *s)
{
char word[ILNLEN];
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)
{
char *r;
if (!hyinit) {
hyinit = 1;
hyph_readpatterns(en_patterns);
hyph_readexceptions(en_exceptions);
}
r = hw_lookup(word);
if (r)
memcpy(hyph, r, strlen(word) + 1);
else
hy_dohyph(hyph, word, flg);
}
void tr_hpfa(char **args)
{
char tok[ILNLEN];
FILE *filp;
/* reading patterns */
if (args[1]) {
hyinit = 1;
filp = fopen(args[1], "r");
while (fscanf(filp, "%s", tok) == 1)
hy_ins(tok);
fclose(filp);
}
/* reading exceptions */
if (args[2]) {
filp = fopen(args[1], "r");
while (fscanf(filp, "%s", tok) == 1)
hw_add(tok);
fclose(filp);
}
}
void hyph_init(void)
{
dict_init(&hwdict, NHYPHS, -1, 0, 1);
dict_init(&hydict, 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);
}