ref: c55c928fc9ce1cdbb8fa8a7aeeb6eea54e2b7657
dir: /trfn.c/
#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <stdio.h>
#include "mkfn.h"
#include "trfn_agl.h"
#include "trfn_ch.h"
#define LEN(a) ((sizeof(a) / sizeof((a)[0])))
#define HEXDIGS "0123456789ABCDEF"
#define NCHAR 8 /* number of characters per glyph */
#define GNLEN 64 /* glyph name length */
/* for buffering the output */
static struct sbuf *sbuf_char; /* character definitions */
/* handling ligatures */
static char mkfn_ligs[8192]; /* font ligatures */
static char mkfn_ligs2[8192]; /* font ligatures, whose length is two */
/* character type */
static int mkfn_asc; /* minimum height of glyphs with ascender */
static int mkfn_desc; /* minimum depth of glyphs with descender */
/* lookup tables */
static struct tab *tab_agl; /* adobe glyph list table */
static struct tab *tab_alts; /* character aliases table */
static int utf8len(int c)
{
if (c > 0 && c <= 0x7f)
return 1;
if (c >= 0xfc)
return 6;
if (c >= 0xf8)
return 5;
if (c >= 0xf0)
return 4;
if (c >= 0xe0)
return 3;
if (c >= 0xc0)
return 2;
return c != 0;
}
static int utf8get(char **src)
{
int result;
int l = 1;
char *s = *src;
if (~((unsigned char) **src) & 0xc0)
return (unsigned char) *(*src)++;
while (l < 6 && (unsigned char) *s & (0x40 >> l))
l++;
result = (0x3f >> l) & (unsigned char) *s++;
while (l--)
result = (result << 6) | ((unsigned char) *s++ & 0x3f);
*src = s;
return result;
}
static void utf8put(char **d, int c)
{
int l = 0;
if (c > 0xffff) {
*(*d)++ = 0xf0 | (c >> 18);
l = 3;
} else if (c > 0x7ff) {
*(*d)++ = 0xe0 | (c >> 12);
l = 2;
} else if (c > 0x7f) {
*(*d)++ = 0xc0 | (c >> 6);
l = 1;
} else {
*(*d)++ = c > 0 ? c : ' ';
}
while (l--)
*(*d)++ = 0x80 | ((c >> (l * 6)) & 0x3f);
**d = '\0';
}
static int hexval(char *s, int len)
{
char *digs = HEXDIGS;
int n = 0;
int i;
for (i = 0; i < len; i++) {
if (s[i] && strchr(digs, s[i]))
n = n * 16 + (strchr(digs, s[i]) - digs);
else
break;
}
return i < 4 ? -1 : n;
}
static int agl_map(char *d, char *s)
{
char *u = tab_get(tab_agl, s); /* unicode code point like "FB8E" */
if (!u)
return 1;
while (u && *u) {
while (*u == ' ')
u++;
utf8put(&d, hexval(u, 6));
u = strchr(u, ' ');
}
*d = '\0';
return 0;
}
static int achar_map(char *name)
{
int i;
for (i = 0; i < LEN(achars); i++) {
struct achar *a = &achars[i];
if (!strncmp(a->name, name, strlen(a->name))) {
char *postfix = name + strlen(a->name);
if (!*postfix)
return a->c;
if (!strcmp("isolated", postfix))
return a->s ? a->s : a->c;
if (!strcmp("initial", postfix))
return a->i ? a->i : a->c;
if (!strcmp("medial", postfix))
return a->m ? a->m : a->c;
if (!strcmp("final", postfix))
return a->f ? a->f : a->c;
}
}
return 0;
}
static int achar_shape(int c, int pjoin, int njoin)
{
int i;
for (i = 0; i < LEN(achars); i++) {
struct achar *a = &achars[i];
if (a->c == c) {
if (!pjoin && !njoin)
return a->c;
if (!pjoin && njoin)
return a->i ? a->i : a->c;
if (pjoin && njoin)
return a->m ? a->m : a->c;
if (pjoin && !njoin)
return a->f ? a->f : a->c;
}
}
return c;
}
static void ashape(char *str, char *ext)
{
int s[NCHAR];
char *src = str;
int i, l;
int bjoin = !strcmp(".medi", ext) || !strcmp(".fina", ext);
int ejoin = !strcmp(".medi", ext) || !strcmp(".init", ext);
for (l = 0; l < NCHAR && *src; l++)
s[l] = utf8get(&src);
for (i = 0; i < l; i++)
s[i] = achar_shape(s[i], i > 0 || bjoin, i < l - 1 || ejoin);
for (i = 0; i < l; i++)
utf8put(&str, s[i]);
}
/* find the utf-8 name of src with the given unicode codepoint */
static int trfn_name(char *dst, char *src, int codepoint)
{
char ch[GNLEN];
char *d = dst;
char *s;
int i;
if (codepoint) {
utf8put(&dst, codepoint);
return 0;
}
if (!src || src[0] == '.')
return 1;
while (*src && *src != '.') {
s = ch;
if (src[0] == '_')
src++;
while (*src && *src != '_' && *src != '.')
*s++ = *src++;
*s = '\0';
if (!agl_map(d, ch)) {
d = strchr(d, '\0');
} else if (ch[0] == 'u' && ch[1] == 'n' &&
ch[2] == 'i' && hexval(ch + 3, 4) > 0) {
for (i = 0; strlen(ch + 3 + 4 * i) >= 4; i++)
utf8put(&d, hexval(ch + 3 + 4 * i, 4));
} else if (ch[0] == 'u' && hexval(ch + 1, 4) > 0) {
utf8put(&d, hexval(ch + 1, 6));
} else if (achar_map(ch)) {
utf8put(&d, achar_map(ch));
} else {
return 1;
}
}
ashape(dst, src);
return *src && strcmp(src, ".medi") && strcmp(src, ".fina") &&
strcmp(src, ".init") && strcmp(src, ".isol");
}
static void trfn_aglexceptions(char *dst)
{
int i;
for (i = 0; i < LEN(agl_exceptions); i++)
if (!strcmp(agl_exceptions[i][0], dst))
strcpy(dst, agl_exceptions[i][1]);
}
static void trfn_ligput(char *c)
{
char *dst = strlen(c) == 2 ? mkfn_ligs2 : mkfn_ligs;
sprintf(strchr(dst, '\0'), "%s ", c);
}
static void trfn_lig(char *c)
{
int i;
for (i = 0; i < LEN(agl_exceptions); i++)
if (!strcmp(agl_exceptions[i][1], c))
return;
if (c[0] && c[1] && strlen(c) > utf8len((unsigned char) c[0])) {
trfn_ligput(c);
} else {
for (i = 0; i < LEN(ligs_utf8); i++)
if (!strcmp(ligs_utf8[i][0], c))
trfn_ligput(ligs_utf8[i][1]);
}
}
static int trfn_type(char *s, int lly, int ury)
{
int typ = 0;
int c = !s[0] || s[1] ? 0 : (unsigned char) *s;
if (c == 't' && !mkfn_asc)
mkfn_asc = ury;
if ((c == 'g' || c == 'j' || c == 'p' || c == 'q' || c == 'y') &&
(!mkfn_desc || mkfn_desc < lly))
mkfn_desc = lly;
if (!mkfn_desc || !mkfn_asc) {
if (c > 0 && c < 128)
return ctype_ascii[c];
return 3;
}
if (!mkfn_desc || lly <= mkfn_desc)
typ |= 1;
if (!mkfn_asc || ury >= mkfn_asc)
typ |= 2;
return typ;
}
/* n is the position and u is the unicode codepoint */
void mkfn_char(char *psname, int n, int u, int wid,
int llx, int lly, int urx, int ury)
{
char uc[GNLEN]; /* mapping unicode character */
char **a_tr; /* troff character names */
char pos[GNLEN] = ""; /* postscript character position/name */
int typ; /* character type */
/* initializing character attributes */
if (trfn_name(uc, psname, u))
strcpy(uc, "---");
trfn_aglexceptions(uc);
if (mkfn_pos && n >= 0 && n < 256)
sprintf(pos, "%d", n);
if (mkfn_pos && n < 0 && !uc[1] && uc[0] >= 32 && uc[0] <= 125)
if (!strchr(psname, '.'))
sprintf(pos, "%d", uc[0]);
typ = trfn_type(!strchr(psname, '.') ? uc : "", lly, ury);
if (!mkfn_swid && (!strcmp(" ", uc) || !strcmp(" ", uc)))
mkfn_swid = wid;
/* printing troff charset */
if (isspace((unsigned char) uc[0]) || strchr(uc, ' '))
strcpy(uc, "---"); /* space not allowed in char names */
if (strcmp("---", uc))
trfn_lig(uc);
sbuf_printf(sbuf_char, "char %s\t%d", uc, wid);
if (mkfn_bbox && (llx || lly || urx || ury))
sbuf_printf(sbuf_char, ",%d,%d,%d,%d", llx, lly, urx, ury);
sbuf_printf(sbuf_char, "\t%d\t%s\t%s\n", typ, psname, pos);
a_tr = tab_get(tab_alts, uc);
while (a_tr && *a_tr)
sbuf_printf(sbuf_char, "char %s\t\"\n", *a_tr++);
}
void mkfn_kern(char *c1, char *c2, int x)
{
if (x && abs(x) >= mkfn_kmin)
if (!mkfn_dry)
printf("kern %s\t%s\t%d\n", c1, c2, x);
}
/* print spacewidth and ligature lines */
void trfn_header(void)
{
printf("spacewidth %d\n", mkfn_swid);
if (!mkfn_noligs)
printf("ligatures %s%s0\n", mkfn_ligs, mkfn_ligs2);
}
/* print character definitions */
void trfn_cdefs(void)
{
fputs(sbuf_buf(sbuf_char), stdout);
}
void trfn_init(void)
{
int i;
sbuf_char = sbuf_make();
tab_agl = tab_alloc(LEN(agl));
for (i = 0; i < LEN(agl); i++)
tab_put(tab_agl, agl[i][0], agl[i][1]);
tab_alts = tab_alloc(LEN(alts));
for (i = 0; i < LEN(alts); i++)
tab_put(tab_alts, alts[i][0], alts[i] + 1);
}
void trfn_done(void)
{
sbuf_free(sbuf_char);
tab_free(tab_alts);
if (tab_agl)
tab_free(tab_agl);
}