roff_term.c

   1 /* $OpenBSD: roff_term.c,v 1.20 2020/09/03 17:37:06 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2010,2014,2015,2017-2020 Ingo Schwarze <schwarze@openbsd.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #include "config.h"
  18
  19 #include <sys/types.h>
  20
  21 #include <assert.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "mandoc.h"
  26 #include "roff.h"
  27 #include "out.h"
  28 #include "term.h"
  29
  30 #define ROFF_TERM_ARGS struct termp *p, const struct roff_node *n
  31
  32 typedef void    (*roff_term_pre_fp)(ROFF_TERM_ARGS);
  33
  34 static  void      roff_term_pre_br(ROFF_TERM_ARGS);
  35 static  void      roff_term_pre_ce(ROFF_TERM_ARGS);
  36 static  void      roff_term_pre_ft(ROFF_TERM_ARGS);
  37 static  void      roff_term_pre_ll(ROFF_TERM_ARGS);
  38 static  void      roff_term_pre_mc(ROFF_TERM_ARGS);
  39 static  void      roff_term_pre_po(ROFF_TERM_ARGS);
  40 static  void      roff_term_pre_sp(ROFF_TERM_ARGS);
  41 static  void      roff_term_pre_ta(ROFF_TERM_ARGS);
  42 static  void      roff_term_pre_ti(ROFF_TERM_ARGS);
  43
  44 static  const roff_term_pre_fp roff_term_pre_acts[ROFF_MAX] = {
  45         roff_term_pre_br,  /* br */
  46         roff_term_pre_ce,  /* ce */
  47         roff_term_pre_br,  /* fi */
  48         roff_term_pre_ft,  /* ft */
  49         roff_term_pre_ll,  /* ll */
  50         roff_term_pre_mc,  /* mc */
  51         roff_term_pre_br,  /* nf */
  52         roff_term_pre_po,  /* po */
  53         roff_term_pre_ce,  /* rj */
  54         roff_term_pre_sp,  /* sp */
  55         roff_term_pre_ta,  /* ta */
  56         roff_term_pre_ti,  /* ti */
  57 };
  58
  59
  60 void
  61 roff_term_pre(struct termp *p, const struct roff_node *n)
  62 {
  63         assert(n->tok < ROFF_MAX);
  64         (*roff_term_pre_acts[n->tok])(p, n);
  65 }
  66
  67 static void
  68 roff_term_pre_br(ROFF_TERM_ARGS)
  69 {
  70         term_newln(p);
  71         if (p->flags & TERMP_BRIND) {
  72                 p->tcol->offset = p->tcol->rmargin;
  73                 p->tcol->rmargin = p->maxrmargin;
  74                 p->trailspace = 0;
  75                 p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
  76                 p->flags |= TERMP_NOSPACE;
  77         }
  78 }
  79
  80 static void
  81 roff_term_pre_ce(ROFF_TERM_ARGS)
  82 {
  83         const struct roff_node  *nc1, *nc2;
  84
  85         roff_term_pre_br(p, n);
  86         p->flags |= n->tok == ROFF_ce ? TERMP_CENTER : TERMP_RIGHT;
  87         nc1 = n->child->next;
  88         while (nc1 != NULL) {
  89                 nc2 = nc1;
  90                 do {
  91                         nc2 = nc2->next;
  92                 } while (nc2 != NULL && (nc2->type != ROFFT_TEXT ||
  93                     (nc2->flags & NODE_LINE) == 0));
  94                 while (nc1 != nc2) {
  95                         if (nc1->type == ROFFT_TEXT)
  96                                 term_word(p, nc1->string);
  97                         else
  98                                 roff_term_pre(p, nc1);
  99                         nc1 = nc1->next;
 100                 }
 101                 p->flags |= TERMP_NOSPACE;
 102                 term_flushln(p);
 103         }
 104         p->flags &= ~(TERMP_CENTER | TERMP_RIGHT);
 105 }
 106
 107 static void
 108 roff_term_pre_ft(ROFF_TERM_ARGS)
 109 {
 110         const char      *cp;
 111
 112         cp = n->child->string;
 113         switch (mandoc_font(cp, (int)strlen(cp))) {
 114         case ESCAPE_FONTBOLD:
 115                 term_fontrepl(p, TERMFONT_BOLD);
 116                 break;
 117         case ESCAPE_FONTITALIC:
 118                 term_fontrepl(p, TERMFONT_UNDER);
 119                 break;
 120         case ESCAPE_FONTBI:
 121                 term_fontrepl(p, TERMFONT_BI);
 122                 break;
 123         case ESCAPE_FONTPREV:
 124                 term_fontlast(p);
 125                 break;
 126         case ESCAPE_FONTROMAN:
 127         case ESCAPE_FONTCW:
 128                 term_fontrepl(p, TERMFONT_NONE);
 129                 break;
 130         default:
 131                 break;
 132         }
 133 }
 134
 135 static void
 136 roff_term_pre_ll(ROFF_TERM_ARGS)
 137 {
 138         term_setwidth(p, n->child != NULL ? n->child->string : NULL);
 139 }
 140
 141 static void
 142 roff_term_pre_mc(ROFF_TERM_ARGS)
 143 {
 144         if (p->col) {
 145                 p->flags |= TERMP_NOBREAK;
 146                 term_flushln(p);
 147                 p->flags &= ~(TERMP_NOBREAK | TERMP_NOSPACE);
 148         }
 149         if (n->child != NULL) {
 150                 p->mc = n->child->string;
 151                 p->flags |= TERMP_NEWMC;
 152         } else
 153                 p->flags |= TERMP_ENDMC;
 154 }
 155
 156 static void
 157 roff_term_pre_po(ROFF_TERM_ARGS)
 158 {
 159         struct roffsu    su;
 160         static int       po, pouse, polast;
 161         int              ponew;
 162
 163         /* Revert the currently active page offset. */
 164         p->tcol->offset -= pouse;
 165
 166         /* Determine the requested page offset. */
 167         if (n->child != NULL &&
 168             a2roffsu(n->child->string, &su, SCALE_EM) != NULL) {
 169                 ponew = term_hen(p, &su);
 170                 if (*n->child->string == '+' ||
 171                     *n->child->string == '-')
 172                         ponew += po;
 173         } else
 174                 ponew = polast;
 175
 176         /* Remeber both the previous and the newly requested offset. */
 177         polast = po;
 178         po = ponew;
 179
 180         /* Truncate to the range [-offset, 60], remember, and apply it. */
 181         pouse = po >= 60 ? 60 :
 182             po < -(int)p->tcol->offset ? -p->tcol->offset : po;
 183         p->tcol->offset += pouse;
 184 }
 185
 186 static void
 187 roff_term_pre_sp(ROFF_TERM_ARGS)
 188 {
 189         struct roffsu    su;
 190         int              len;
 191
 192         if (n->child != NULL) {
 193                 if (a2roffsu(n->child->string, &su, SCALE_VS) == NULL)
 194                         su.scale = 1.0;
 195                 len = term_vspan(p, &su);
 196         } else
 197                 len = 1;
 198
 199         if (len < 0)
 200                 p->skipvsp -= len;
 201         else
 202                 while (len--)
 203                         term_vspace(p);
 204
 205         roff_term_pre_br(p, n);
 206 }
 207
 208 static void
 209 roff_term_pre_ta(ROFF_TERM_ARGS)
 210 {
 211         term_tab_set(p, NULL);
 212         for (n = n->child; n != NULL; n = n->next)
 213                 term_tab_set(p, n->string);
 214 }
 215
 216 static void
 217 roff_term_pre_ti(ROFF_TERM_ARGS)
 218 {
 219         struct roffsu    su;
 220         const char      *cp;
 221         const size_t     maxoff = 72;
 222         int              len, sign;
 223
 224         roff_term_pre_br(p, n);
 225
 226         if (n->child == NULL)
 227                 return;
 228         cp = n->child->string;
 229         if (*cp == '+') {
 230                 sign = 1;
 231                 cp++;
 232         } else if (*cp == '-') {
 233                 sign = -1;
 234                 cp++;
 235         } else
 236                 sign = 0;
 237
 238         if (a2roffsu(cp, &su, SCALE_EM) == NULL)
 239                 return;
 240         len = term_hen(p, &su);
 241
 242         switch (sign) {
 243         case 1:
 244                 if (p->tcol->offset + len <= maxoff)
 245                         p->ti = len;
 246                 else if (p->tcol->offset < maxoff)
 247                         p->ti = maxoff - p->tcol->offset;
 248                 else
 249                         p->ti = 0;
 250                 break;
 251         case -1:
 252                 if ((size_t)len < p->tcol->offset)
 253                         p->ti = -len;
 254                 else
 255                         p->ti = -p->tcol->offset;
 256                 break;
 257         default:
 258                 if ((size_t)len > maxoff)
 259                         len = maxoff;
 260                 p->ti = len - p->tcol->offset;
 261                 break;
 262         }
 263         p->tcol->offset += p->ti;
 264 }