ref: 2f5ccbee8981330d8e872a6b505c9aae647d6320
dir: /ren.c/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "xroff.h"
#define LL (n_l - n_i) /* effective line length */
/* diversion */
struct div {
int f, s, f0, s0; /* backup variables */
};
static struct adj adj; /* line buffer */
static int ren_backed = -1; /* pushed back character */
static int ren_div; /* current diversion */
static struct sbuf out_div; /* current diversion output */
static struct div cur_div;
static int ren_next(void)
{
int c = ren_backed >= 0 ? ren_backed : tr_next();
ren_backed = -1;
return c;
}
static void ren_back(int c)
{
ren_backed = c;
}
static int nextchar(char *s)
{
int c = ren_next();
int l = utf8len(c);
int i;
if (c < 0)
return 0;
s[0] = c;
for (i = 1; i < l; i++)
s[i] = ren_next();
s[l] = '\0';
return l;
}
static void ren_ne(int n)
{
if (n_nl + n > n_p && !ren_div)
ren_page(n_pg + 1);
}
void tr_di(char **args)
{
if (args[1]) {
sbuf_init(&out_div);
ren_div = REG(args[1][0], args[1][1]);
n_d = 0;
} else if (ren_div) {
sbuf_putnl(&out_div);
str_set(ren_div, sbuf_buf(&out_div));
sbuf_done(&out_div);
ren_div = 0;
}
}
/* begin outputting diverted line */
static void div_beg(void)
{
cur_div.f = n_f;
cur_div.s = n_s;
cur_div.f0 = n_f0;
cur_div.s0 = n_s0;
}
/* end outputting diverted line */
static void div_end(void)
{
n_f = cur_div.f;
n_s = cur_div.s;
n_f0 = cur_div.f0;
n_s0 = cur_div.s0;
}
/* vertical motion before rendering lines */
static void down(int n)
{
char cmd[32];
n_d += n;
if (ren_div) {
sbuf_putnl(&out_div);
sprintf(cmd, ".sp %du\n", n);
sbuf_append(&out_div, cmd);
} else {
n_nl = n_d;
if (n_nl <= n_p)
OUT("v%d\n", n);
}
ren_ne(0);
}
static void out_line(char *out)
{
char cmd[32];
if (ren_div) {
if (!sbuf_empty(&out_div))
down(n_v);
sprintf(cmd, "\\h'%d'", n_i);
sbuf_append(&out_div, DIV_BEG);
sbuf_append(&out_div, cmd);
sbuf_append(&out_div, out);
sbuf_append(&out_div, DIV_END);
} else {
down(n_v);
OUT("H%d\n", n_o + n_i);
output(out);
}
}
static void ren_br(int sp)
{
char out[LNLEN];
if (adj.nwords) {
adj_fi(&adj, n_u ? n_ad : ADJ_N, LL, out);
ren_ne(n_v);
out_line(out);
ren_ne(n_v);
}
if (sp)
down(sp);
}
void tr_br(char **args)
{
ren_br(0);
}
void tr_sp(char **args)
{
int sp = 0;
if (args[1])
sp = tr_int(args[1], 0, 'v');
ren_br(sp);
}
void ren_page(int pg)
{
n_nl = -1;
n_d = 0;
n_pg = pg;
OUT("p%d\n", pg);
OUT("V%d\n", 0);
}
void tr_bp(char **args)
{
if (!ren_div) {
ren_br(0);
ren_page(args[1] ? tr_int(args[1], n_pg, 'v') : n_pg + 1);
}
}
static void ren_ps(char *s)
{
int ps = !*s || !strcmp("0", s) ? n_s0 : tr_int(s, n_s, '\0');
n_s0 = n_s;
n_s = ps;
}
void tr_ps(char **args)
{
if (args[1])
ren_ps(args[1]);
}
void tr_in(char **args)
{
ren_br(0);
if (args[1])
n_i = tr_int(args[1], n_i, 'm');
}
static void ren_ft(char *s)
{
int fn = !*s || !strcmp("P", s) ? n_f0 : dev_font(s);
if (fn >= 0) {
n_f0 = n_f;
n_f = fn;
}
}
void tr_ft(char **args)
{
if (args[1])
ren_ft(args[1]);
}
void tr_fp(char **args)
{
if (!args[2])
return;
if (dev_mnt(atoi(args[1]), args[2], args[3] ? args[3] : args[2]) < 0)
errmsg("troff: failed to mount %s\n", args[2]);
}
void tr_nf(char **args)
{
ren_br(0);
n_u = 0;
}
static void escarg_ren(char *d, int cmd)
{
int c, q;
if (strchr(ESC_P, cmd)) {
c = ren_next();
if (cmd == 's' && (c == '-' || c == '+')) {
*d++ = c;
c = ren_next();
}
if (c == '(') {
*d++ = ren_next();
*d++ = ren_next();
} else {
*d++ = c;
if (cmd == 's' && c >= '1' && c <= '3') {
c = ren_next();
if (isdigit(c))
*d++ = c;
else
ren_back(c);
}
}
}
if (strchr(ESC_Q, cmd)) {
q = ren_next();
while (1) {
c = ren_next();
if (c == q || c < 0)
break;
*d++ = c;
}
}
if (cmd == 'z')
*d++ = ren_next();
*d = '\0';
}
void render(void)
{
char c[GNLEN * 2];
char arg[ILNLEN];
struct glyph *g;
int blanks = 0;
int newline = 0;
int r_s = n_s;
int r_f = n_f;
int esc = 0;
int space_br = 0; /* .br caused by indented lines */
ren_br(0);
while (nextchar(c) > 0) {
g = NULL;
if (n_u && adj_inbreak(&adj, LL))
ren_br(0);
if (c[0] == ' ' || c[0] == '\n') {
if (adj_inword(&adj))
adj_wordend(&adj);
if (!n_u && c[0] == '\n')
ren_br(0);
if (n_u && newline && c[0] == '\n')
ren_br(n_v);
if (n_u && newline && c[0] == ' ' && !space_br) {
space_br = 1;
ren_br(0);
}
if (c[0] == '\n') {
blanks = 0;
newline = 1;
space_br = 0;
}
if (c[0] == ' ')
blanks += charwid(dev_spacewid(), n_s);
continue;
}
esc = 0;
if (c[0] == '\\') {
esc = 1;
nextchar(c);
/* rendered lines inside diversions */
if (c[0] == DIV_BEG[1]) {
nextchar(c);
if (c[0] == DIV_BEG[2])
div_beg();
if (c[0] == DIV_END[2])
div_end();
continue;
}
if (c[0] == '(') {
int l = nextchar(c);
l += nextchar(c + l);
c[l] = '\0';
} else if (strchr("sf", c[0])) {
escarg_ren(arg, c[0]);
if (c[0] == 'f')
ren_ft(arg);
if (c[0] == 's')
ren_ps(arg);
continue;
}
}
if (!adj_inword(&adj)) {
if (newline && !blanks && adj.nwords >= 1)
blanks = charwid(dev_spacewid(), n_s);
adj_wordbeg(&adj, blanks);
newline = 0;
blanks = 0;
}
if (r_s != n_s) {
adj_putcmd(&adj, "\\s(%02d", n_s);
r_s = n_s;
}
if (r_f != n_f) {
adj_putcmd(&adj, "\\f(%02d", n_f);
r_f = n_f;
}
if (utf8len(c[0]) == strlen(c))
sprintf(arg, "%s%s", esc ? "\\" : "", c);
else
sprintf(arg, "\\(%s", c);
g = dev_glyph(c, n_f);
adj_putchar(&adj, charwid(g ? g->wid : dev_spacewid(), n_s), arg);
}
if (n_u)
ren_br(0);
ren_br(0);
}