roff_term.c

   1 /* $Id: roff_term.c,v 1.20 2020/06/22 19:20:40 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2010,2014,2015,2017-2019 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, polast;
 161         int              ponew;
 162
 163         if (n->child != NULL &&
 164             a2roffsu(n->child->string, &su, SCALE_EM) != NULL) {
 165                 ponew = term_hen(p, &su);
 166                 if (*n->child->string == '+' ||
 167                     *n->child->string == '-')
 168                         ponew += po;
 169         } else
 170                 ponew = polast;
 171         polast = po;
 172         po = ponew;
 173
 174         ponew = po - polast + (int)p->tcol->offset;
 175         p->tcol->offset = ponew > 0 ? ponew : 0;
 176 }
 177
 178 static void
 179 roff_term_pre_sp(ROFF_TERM_ARGS)
 180 {
 181         struct roffsu    su;
 182         int              len;
 183
 184         if (n->child != NULL) {
 185                 if (a2roffsu(n->child->string, &su, SCALE_VS) == NULL)
 186                         su.scale = 1.0;
 187                 len = term_vspan(p, &su);
 188         } else
 189                 len = 1;
 190
 191         if (len < 0)
 192                 p->skipvsp -= len;
 193         else
 194                 while (len--)
 195                         term_vspace(p);
 196
 197         roff_term_pre_br(p, n);
 198 }
 199
 200 static void
 201 roff_term_pre_ta(ROFF_TERM_ARGS)
 202 {
 203         term_tab_set(p, NULL);
 204         for (n = n->child; n != NULL; n = n->next)
 205                 term_tab_set(p, n->string);
 206 }
 207
 208 static void
 209 roff_term_pre_ti(ROFF_TERM_ARGS)
 210 {
 211         struct roffsu    su;
 212         const char      *cp;
 213         int              len, sign;
 214
 215         roff_term_pre_br(p, n);
 216
 217         if (n->child == NULL)
 218                 return;
 219         cp = n->child->string;
 220         if (*cp == '+') {
 221                 sign = 1;
 222                 cp++;
 223         } else if (*cp == '-') {
 224                 sign = -1;
 225                 cp++;
 226         } else
 227                 sign = 0;
 228
 229         if (a2roffsu(cp, &su, SCALE_EM) == NULL)
 230                 return;
 231         len = term_hen(p, &su);
 232
 233         if (sign == 0) {
 234                 p->ti = len - p->tcol->offset;
 235                 p->tcol->offset = len;
 236         } else if (sign == 1) {
 237                 p->ti = len;
 238                 p->tcol->offset += len;
 239         } else if ((size_t)len < p->tcol->offset) {
 240                 p->ti = -len;
 241                 p->tcol->offset -= len;
 242         } else {
 243                 p->ti = -p->tcol->offset;
 244                 p->tcol->offset = 0;
 245         }
 246 }