1 /* rendering lines and managing traps */
8 #define NOPAGE 0x40000000 /* undefined bp_next */
9 #define cfmt env_fmt() /* current formatter */
10 #define cwb env_wb() /* current word buffer */
14 struct sbuf sbuf
; /* diversion output */
15 int reg
; /* diversion register */
16 int tpos
; /* diversion trap position */
17 int treg
; /* diversion trap register */
18 int dl
; /* diversion width */
19 int prev_d
; /* previous \n(.d value */
20 int prev_h
; /* previous \n(.h value */
21 int prev_mk
; /* previous .mk internal register */
22 int prev_ns
; /* previous .ns value */
24 static struct div divs
[NPREV
]; /* diversion stack */
25 static struct div
*cdiv
; /* current diversion */
26 static int ren_div
; /* rendering a diversion */
27 static int trap_em
= -1; /* end macro */
29 static int ren_nl
; /* just after a newline */
30 static int ren_partial
; /* reading an input line in render_rec() */
31 static int ren_unbuf
[8]; /* ren_back() buffer */
33 static int ren_aborted
; /* .ab executed */
35 static int bp_first
= 1; /* prior to the first page */
36 static int bp_next
= NOPAGE
; /* next page number */
37 static int bp_count
; /* number of pages so far */
38 static int bp_ejected
; /* current ejected page */
39 static int bp_final
; /* 1: executing em, 2: the final page, 3: the 2nd final page */
40 static int ren_level
; /* the depth of render_rec() calls */
42 static char c_fa
[GNLEN
]; /* field delimiter */
43 static char c_fb
[GNLEN
]; /* field padding */
45 static int ren_next(void)
47 return ren_un
> 0 ? ren_unbuf
[--ren_un
] : tr_next();
50 static void ren_back(int c
)
52 ren_unbuf
[ren_un
++] = c
;
55 void tr_di(char **args
)
58 cdiv
= cdiv
? cdiv
+ 1 : divs
;
59 memset(cdiv
, 0, sizeof(*cdiv
));
60 sbuf_init(&cdiv
->sbuf
);
61 cdiv
->reg
= map(args
[1]);
63 if (args
[0][2] == 'a' && str_get(cdiv
->reg
)) /* .da */
64 sbuf_append(&cdiv
->sbuf
, str_get(cdiv
->reg
));
65 sbuf_printf(&cdiv
->sbuf
, "%c%s\n", c_cc
, TR_DIVBEG
);
75 sbuf_putnl(&cdiv
->sbuf
);
76 sbuf_printf(&cdiv
->sbuf
, "%c%s\n", c_cc
, TR_DIVEND
);
77 str_set(cdiv
->reg
, sbuf_buf(&cdiv
->sbuf
));
78 sbuf_done(&cdiv
->sbuf
);
85 cdiv
= cdiv
> divs
? cdiv
- 1 : NULL
;
91 return cdiv
? cdiv
->reg
: -1;
96 return fmt_wid(cfmt
) + wb_wid(cwb
);
99 void tr_divbeg(char **args
)
105 void tr_divend(char **args
)
108 errdie("neatroff: diversion stack empty\n");
113 static int trap_reg(int pos
);
114 static int trap_pos(int pos
);
115 static void trap_exec(int reg
);
117 static void ren_page(int force
)
119 if (!force
&& bp_final
>= 2)
124 n_pg
= bp_next
!= NOPAGE
? bp_next
: n_pg
+ 1;
129 if (trap_pos(-1) == 0)
130 trap_exec(trap_reg(-1));
133 static int ren_first(void)
135 if (bp_first
&& !cdiv
) {
143 /* when nodiv, do not append .sp to diversions */
144 static void ren_sp(int n
, int nodiv
)
147 /* ignore .sp without arguments when reading diversions */
148 if (!n
&& ren_div
&& !n_u
)
153 if (cdiv
&& !nodiv
) {
154 sbuf_putnl(&cdiv
->sbuf
);
155 sbuf_printf(&cdiv
->sbuf
, "%csp %du\n", c_cc
, n
? n
: n_v
);
161 static int render_rec(int level
);
162 static void trap_exec(int reg
)
165 int partial
= ren_partial
&& (!ren_un
|| ren_unbuf
[0] != '\n');
167 sprintf(cmd
, "%c%s %d\n", c_cc
, TR_POPREN
, ren_level
);
169 in_push(str_get(reg
), NULL
);
172 render_rec(++ren_level
);
173 /* executed the trap while in the middle of an input line */
175 fmt_suppressnl(cfmt
);
179 static int detect_traps(int beg
, int end
)
181 int pos
= trap_pos(beg
);
182 return pos
>= 0 && (cdiv
|| pos
< n_p
) && pos
<= end
;
185 /* return 1 if executed a trap */
186 static int ren_traps(int beg
, int end
, int dosp
)
188 int pos
= trap_pos(beg
);
189 if (detect_traps(beg
, end
)) {
190 if (dosp
&& pos
> beg
)
191 ren_sp(pos
- beg
, 0);
192 trap_exec(trap_reg(beg
));
198 static int detect_pagelimit(int ne
)
200 return !cdiv
&& n_nl
+ ne
>= n_p
;
203 /* start a new page if needed */
204 static int ren_pagelimit(int ne
)
206 if (detect_pagelimit(ne
)) {
213 /* return 1 if triggered a trap */
214 static int down(int n
)
216 if (ren_traps(n_d
, n_d
+ (n
? n
: n_v
), 1))
219 return ren_pagelimit(0);
222 /* line adjustment */
223 static int ren_ljust(struct sbuf
*spre
, int w
, int ad
, int li
, int ll
)
226 int llen
= ll
- ljust
;
228 if ((ad
& AD_B
) == AD_C
)
229 ljust
+= llen
> w
? (llen
- w
) / 2 : 0;
230 if ((ad
& AD_B
) == AD_R
)
233 sbuf_printf(spre
, "%ch'%du'", c_ec
, ljust
);
234 if (cdiv
&& cdiv
->dl
< w
+ ljust
)
235 cdiv
->dl
= w
+ ljust
;
239 /* append the line to the current diversion or send it to out.c */
240 static void ren_out(char *beg
, char *mid
, char *end
)
243 sbuf_append(&cdiv
->sbuf
, beg
);
244 sbuf_append(&cdiv
->sbuf
, mid
);
245 sbuf_append(&cdiv
->sbuf
, end
);
255 static void ren_transparent(char *s
)
258 sbuf_printf(&cdiv
->sbuf
, "%s\n", s
);
263 static int zwid(void)
265 struct glyph
*g
= dev_glyph("0", n_f
);
266 return g
? font_gwid(g
->font
, dev_font(n_f
), n_s
, g
->wid
) : 0;
269 /* append the line number to the output line */
270 static void ren_lnum(struct sbuf
*spre
)
277 if (n_nn
<= 0 && (n_ln
% n_nM
) == 0)
278 sprintf(num
, "%d", n_ln
);
279 wb_hmov(&wb
, n_nI
* zwid());
281 wb_hmov(&wb
, (3 - strlen(num
)) * zwid());
286 wb_hmov(&wb
, n_nS
* zwid());
287 sbuf_append(spre
, wb_buf(&wb
));
295 /* append margin character */
296 static void ren_mc(struct sbuf
*sbuf
, int w
, int ljust
)
300 if (w
+ ljust
< n_l
+ n_mcn
)
301 wb_hmov(&wb
, n_l
+ n_mcn
- w
- ljust
);
302 wb_putexpand(&wb
, c_mc
);
303 sbuf_append(sbuf
, wb_buf(&wb
));
307 /* process a line and print it with ren_out() */
308 static int ren_line(char *line
, int w
, int ad
, int body
,
309 int li
, int ll
, int els_neg
, int els_pos
)
311 struct sbuf sbeg
, send
;
312 int prev_d
, lspc
, ljust
;
316 lspc
= MAX(1, n_L
) * n_v
; /* line space, ignoreing \x */
320 if (!n_ns
|| line
[0] || els_neg
|| els_pos
) {
322 if (line
[0] && n_nm
&& body
)
324 ljust
= ren_ljust(&sbeg
, w
, ad
, li
, ll
);
325 if (line
[0] && body
&& n_mc
)
326 ren_mc(&send
, w
, ljust
);
327 ren_out(sbuf_buf(&sbeg
), line
, sbuf_buf(&send
));
335 if (detect_traps(prev_d
, n_d
) || detect_pagelimit(lspc
- n_v
)) {
336 if (!ren_pagelimit(lspc
- n_v
))
337 ren_traps(prev_d
, n_d
, 0);
340 if (lspc
- n_v
&& down(lspc
- n_v
))
345 /* read a line from fmt and send it to ren_line() */
346 static int ren_passline(struct fmt
*fmt
)
349 int ll
, li
, els_neg
, els_pos
, w
, ret
;
352 if (!fmt_morewords(fmt
))
355 fmt_nextline(fmt
, &sbuf
, &w
, &li
, &ll
, &els_neg
, &els_pos
);
356 if ((n_cp
&& !n_u
) || n_na
)
360 ret
= ren_line(sbuf_buf(&sbuf
), w
, ad
, 1, li
, ll
, els_neg
, els_pos
);
365 /* output formatted lines in fmt */
366 static void ren_fmtpop(struct fmt
*fmt
)
368 while (fmt_morelines(fmt
))
372 /* format and output all lines in fmt */
373 static void ren_fmtpopall(struct fmt
*fmt
)
375 while (fmt_fill(fmt
))
380 /* pass the given word buffer to the current line buffer (cfmt) */
381 static void ren_fmtword(struct wb
*wb
)
383 while (fmt_word(cfmt
, wb
))
388 /* output current line; returns 1 if triggered a trap */
389 static int ren_br(void)
396 return ren_passline(cfmt
);
399 void tr_br(char **args
)
401 ren_fmtpopall(cfmt
); /* output the completed lines first */
402 if (args
[0][0] == c_cc
)
406 void tr_sp(char **args
)
409 int n
= args
[1] ? eval(args
[1], 'v') : n_v
;
410 if (args
[0][0] == c_cc
)
412 if (n
&& !n_ns
&& !traps
)
416 void tr_sv(char **args
)
418 int n
= eval(args
[1], 'v');
420 if (n_d
+ n
< f_nexttrap())
426 void tr_ns(char **args
)
431 void tr_rs(char **args
)
436 void tr_os(char **args
)
443 void tr_mk(char **args
)
446 num_set(map(args
[1]), n_d
);
451 void tr_rt(char **args
)
453 int n
= args
[1] ? eval_re(args
[1], n_d
, 'v') : n_mk
;
454 if (n
>= 0 && n
< n_d
)
458 void tr_ne(char **args
)
460 int n
= args
[1] ? eval(args
[1], 'v') : n_v
;
463 if (!ren_traps(n_d
, n_d
+ n
- 1, 1))
467 static void ren_ejectpage(int br
)
469 bp_ejected
= bp_count
;
472 while (bp_count
== bp_ejected
&& !cdiv
) {
473 if (detect_traps(n_d
, n_p
)) {
474 ren_traps(n_d
, n_p
, 1);
482 void tr_bp(char **args
)
484 if (!cdiv
&& (args
[1] || !n_ns
)) {
486 bp_next
= eval_re(args
[1], n_pg
, 0);
487 ren_ejectpage(args
[0][0] == c_cc
);
491 void tr_pn(char **args
)
494 bp_next
= eval_re(args
[1], n_pg
, 0);
497 static void ren_ps(char *s
)
499 int ps
= !s
|| !*s
|| !strcmp("0", s
) ?
500 n_s0
* SC_PT
: eval_re(s
, n_s
* SC_PT
, 'p');
502 n_s
= MAX(1, (ps
+ SC_PT
/ 2) / SC_PT
);
505 void tr_ps(char **args
)
510 void tr_ll(char **args
)
512 int ll
= args
[1] ? eval_re(args
[1], n_l
, 'm') : n_l0
;
517 void tr_in(char **args
)
519 int in
= args
[1] ? eval_re(args
[1], n_i
, 'm') : n_i0
;
520 if (args
[0][0] == c_cc
)
527 void tr_ti(char **args
)
529 if (args
[0][0] == c_cc
)
532 n_ti
= eval_re(args
[1], n_i
, 'm');
535 static void ren_ft(char *s
)
537 int fn
= !s
|| !*s
|| !strcmp("P", s
) ? n_f0
: dev_pos(s
);
539 errmsg("neatroff: failed to mount <%s>\n", s
);
546 void tr_ft(char **args
)
551 void tr_fp(char **args
)
555 if (dev_mnt(atoi(args
[1]), args
[2], args
[3] ? args
[3] : args
[2]) < 0)
556 errmsg("neatroff: failed to mount <%s>\n", args
[2]);
559 void tr_nf(char **args
)
561 if (args
[0][0] == c_cc
)
566 void tr_fi(char **args
)
568 if (args
[0][0] == c_cc
)
573 void tr_ce(char **args
)
575 if (args
[0][0] == c_cc
)
577 n_ce
= args
[1] ? atoi(args
[1]) : 1;
580 void tr_fc(char **args
)
584 if (fa
&& charread(&fa
, c_fa
) >= 0) {
585 if (!fb
|| charread(&fb
, c_fb
) < 0)
593 static void ren_cl(char *s
)
595 int m
= !s
|| !*s
? n_m0
: clr_get(s
);
600 void tr_cl(char **args
)
605 void tr_ab(char **args
)
607 fprintf(stderr
, "%s\n", args
[1]);
611 static void ren_cmd(struct wb
*wb
, int c
, char *arg
)
615 wb_hmov(wb
, font_swid(dev_font(n_f
), n_s
, n_ss
));
627 wb_vmov(wb
, SC_EM
/ 2);
633 wb_hmov(wb
, eval(arg
, 'm'));
636 num_set(map(arg
), wb
== cwb
? f_hpos() - n_lb
: wb_wid(wb
));
652 while (fmt_fillreq(cfmt
))
662 wb_vmov(wb
, -SC_EM
/ 2);
665 wb_vmov(wb
, eval(arg
, 'v'));
671 wb_els(wb
, eval(arg
, 'v'));
680 wb_hmov(wb
, SC_EM
/ 6);
686 wb_hmov(wb
, SC_EM
/ 12);
689 wb_italiccorrection(wb
);
692 wb_italiccorrectionleft(wb
);
697 static void ren_field(struct wb
*wb
, int (*next
)(void), void (*back
)(int));
698 static void ren_tab(struct wb
*wb
, char *tc
, int (*next
)(void), void (*back
)(int));
700 /* insert a character, escape sequence, field or etc into wb */
701 static void ren_put(struct wb
*wb
, char *c
, int (*next
)(void), void (*back
)(int))
706 if (c
[0] == ' ' || c
[0] == '\n') {
710 if (c
[0] == '\t' || c
[0] == '\x01') {
711 ren_tab(wb
, c
[0] == '\t' ? c_tc
: c_lc
, next
, back
);
714 if (c_fa
[0] && !strcmp(c_fa
, c
)) {
715 ren_field(wb
, next
, back
);
721 ren_char(wb
, next
, back
);
722 wb_hmov(wb
, w
- wb_wid(wb
));
726 if (ren_nl
&& next
== ren_next
) {
729 while (n
>= 0 && n
!= '\n') {
734 ren_transparent(arg
);
738 if (strchr(" bCcDdefHhkLlmNoprSsuvXxZz0^|{}&/,", c
[1])) {
740 if (strchr(ESC_P
, c
[1]))
741 unquotednext(arg
, c
[1], next
, back
);
742 if (strchr(ESC_Q
, c
[1]))
743 quotednext(arg
, next
, back
);
745 snprintf(c
, GNLEN
, "%c%c", c_ec
, c_ec
);
746 } else if (c
[1] == 'N') {
747 snprintf(c
, GNLEN
, "GID=%s", arg
);
749 ren_cmd(wb
, c
[1], arg
);
758 if (cdef_map(c
, n_f
)) /* .char characters */
764 /* read one character and place it inside wb buffer */
765 int ren_char(struct wb
*wb
, int (*next
)(void), void (*back
)(int))
768 if (charnext(c
, next
, back
) < 0)
770 ren_put(wb
, c
, next
, back
);
774 /* like ren_char(); return 1 if d1 was read and 2 if d2 was read */
775 static int ren_chardel(struct wb
*wb
, int (*next
)(void), void (*back
)(int),
779 if (charnext(c
, next
, back
) < 0)
781 if (d1
&& !strcmp(d1
, c
))
783 if (d2
&& !strcmp(d2
, c
))
785 ren_put(wb
, c
, next
, back
);
789 /* read the argument of \w and push its width */
790 int ren_wid(int (*next
)(void), void (*back
)(int))
796 charnext(delim
, next
, back
);
799 while (c
>= 0 && c
!= '\n') {
801 if (ren_chardel(&wb
, next
, back
, delim
, NULL
))
807 wb_wconf(&wb
, &n_ct
, &n_st
, &n_sb
, &n_llx
, &n_lly
, &n_urx
, &n_ury
);
812 /* return 1 if d1 was read and 2 if d2 was read */
813 static int ren_until(struct wb
*wb
, char *d1
, char *d2
,
814 int (*next
)(void), void (*back
)(int))
818 while (c
>= 0 && c
!= '\n') {
820 ret
= ren_chardel(wb
, next
, back
, d1
, d2
);
830 static void wb_cpy(struct wb
*dst
, struct wb
*src
, int left
)
832 wb_hmov(dst
, left
- wb_wid(dst
));
836 void ren_tl(int (*next
)(void), void (*back
)(int))
842 charnext(delim
, next
, back
);
843 if (!strcmp("\n", delim
))
845 /* the left-adjusted string */
846 ren_until(&wb2
, delim
, NULL
, next
, back
);
847 wb_cpy(&wb
, &wb2
, 0);
848 /* the centered string */
849 ren_until(&wb2
, delim
, NULL
, next
, back
);
850 wb_cpy(&wb
, &wb2
, (n_lt
- wb_wid(&wb2
)) / 2);
851 /* the right-adjusted string */
852 ren_until(&wb2
, delim
, NULL
, next
, back
);
853 wb_cpy(&wb
, &wb2
, n_lt
- wb_wid(&wb2
));
854 /* flushing the line */
855 ren_line(wb_buf(&wb
), wb_wid(&wb
), AD_L
, 0,
856 0, n_lt
, wb
.els_neg
, wb
.els_pos
);
861 static void ren_field(struct wb
*wb
, int (*next
)(void), void (*back
)(int))
863 struct wb wbs
[NFIELDS
];
866 int left
, right
, cur_left
;
868 while (n
< LEN(wbs
)) {
870 if (ren_until(&wbs
[n
++], c_fb
, c_fa
, next
, back
) != 1)
873 left
= wb
== cwb
? f_hpos() : wb_wid(wb
);
874 right
= tab_next(left
);
875 for (i
= 0; i
< n
; i
++)
876 wid
+= wb_wid(&wbs
[i
]);
877 pad
= (right
- left
- wid
) / (n
> 1 ? n
- 1 : 1);
878 rem
= (right
- left
- wid
) % (n
> 1 ? n
- 1 : 1);
879 for (i
= 0; i
< n
; i
++) {
883 cur_left
= right
- wb_wid(&wbs
[i
]);
885 cur_left
= wb_wid(wb
) + pad
+ (i
+ rem
>= n
);
886 wb_cpy(wb
, &wbs
[i
], cur_left
);
891 static void ren_tab(struct wb
*wb
, char *tc
, int (*next
)(void), void (*back
)(int))
894 int pos
= wb
== cwb
? f_hpos() : wb_wid(wb
);
895 int ins
= tab_next(pos
); /* insertion position */
896 int typ
= tab_type(pos
); /* tab type */
899 if (typ
== 'R' || typ
== 'C') {
901 while (c
>= 0 && c
!= '\n' && c
!= '\t' && c
!= '\x01') {
903 ren_char(&t
, next
, back
);
909 ins
-= wb_wid(&t
) / 2;
912 if (!tc
[0] || ins
<= pos
)
913 wb_hmov(wb
, ins
- pos
);
915 ren_hline(wb
, ins
- pos
, tc
);
920 /* parse characters and troff requests of s and append them to wb */
921 int ren_parse(struct wb
*wb
, char *s
)
929 if (ren_char(wb
, sstr_next
, sstr_back
))
938 /* cause nested render_rec() to exit */
939 void tr_popren(char **args
)
941 ren_level
= args
[1] ? atoi(args
[1]) : 0;
944 #define FMT_PAR() (n_u && !n_na && !n_ce && (n_j & AD_P) == AD_P)
946 /* read characters from tr.c and pass the rendered lines to out.c */
947 static int render_rec(int level
)
950 while (ren_level
>= level
) {
951 while (!ren_un
&& !tr_nextreq())
952 if (ren_level
< level
)
954 if (ren_level
< level
)
973 ren_partial
= c
!= '\n';
974 /* add cwb (the current word) to cfmt */
975 if (c
== ' ' || c
== '\n') {
976 if (!wb_part(cwb
)) { /* not after a \c */
979 while (fmt_newline(cfmt
))
987 /* flush the line if necessary */
988 if ((!FMT_PAR() && (c
== ' ' || c
== '\n')) || c
< 0)
990 if (c
== '\n' || ren_nl
) /* end or start of input line */
992 if (c
== '\n' && n_it
&& --n_itn
== 0)
994 if (c
== '\n' && !wb_part(cwb
))
995 n_ce
= MAX(0, n_ce
- 1);
996 if (c
!= ' ' && c
>= 0) {
998 ren_char(cwb
, ren_next
, ren_back
);
1006 /* render input words */
1010 while (!tr_nextreq())
1012 ren_first(); /* transition to the first page */
1015 if (fmt_morewords(cfmt
))
1023 #define tposval(i) (tpos[i] < 0 ? n_p + tpos[i] : tpos[i])
1025 static int tpos
[NTRAPS
]; /* trap positions */
1026 static int treg
[NTRAPS
]; /* trap registers */
1029 static int trap_first(int pos
)
1033 for (i
= 0; i
< ntraps
; i
++)
1034 if (treg
[i
] >= 0 && tposval(i
) > pos
)
1035 if (best
< 0 || tposval(i
) < tposval(best
))
1040 static int trap_byreg(int reg
)
1043 for (i
= 0; i
< ntraps
; i
++)
1049 static int trap_bypos(int reg
, int pos
)
1052 for (i
= 0; i
< ntraps
; i
++)
1053 if (treg
[i
] >= 0 && tposval(i
) == pos
)
1054 if (reg
== -1 || treg
[i
] == reg
)
1059 void tr_wh(char **args
)
1064 pos
= eval(args
[1], 'v');
1065 id
= trap_bypos(-1, pos
);
1072 if (id
< 0) /* find an unused position in treg[] */
1073 id
= trap_byreg(-1);
1080 void tr_ch(char **args
)
1087 id
= trap_byreg(reg
);
1090 tpos
[id
] = eval(args
[2], 'v');
1096 void tr_dt(char **args
)
1101 cdiv
->tpos
= eval(args
[1], 'v');
1102 cdiv
->treg
= map(args
[2]);
1108 void tr_em(char **args
)
1110 trap_em
= args
[1] ? map(args
[1]) : -1;
1113 static int trap_pos(int pos
)
1115 int ret
= trap_first(pos
);
1119 return cdiv
->treg
&& cdiv
->tpos
> pos
? cdiv
->tpos
: -1;
1120 return ret
>= 0 ? tposval(ret
) : -1;
1123 static int trap_reg(int pos
)
1125 int ret
= trap_first(pos
);
1127 return cdiv
->treg
&& cdiv
->tpos
> pos
? cdiv
->treg
: -1;
1128 return ret
>= 0 ? treg
[ret
] : -1;
1131 int f_nexttrap(void)
1133 int pos
= trap_pos(n_d
);
1135 return pos
>= 0 ? pos
: 0x7fffffff;
1136 return (pos
>= 0 && pos
< n_p
? pos
: n_p
) - n_d
;