roff_term.c

   1 /*      $Id: roff_term.c,v 1.19 2019/01/04 03:24:33 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 <sys/types.h>
  18
  19 #include <assert.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22
  23 #include "mandoc.h"
  24 #include "roff.h"
  25 #include "out.h"
  26 #include "term.h"
  27
  28 #define ROFF_TERM_ARGS struct termp *p, const struct roff_node *n
  29
  30 typedef void    (*roff_term_pre_fp)(ROFF_TERM_ARGS);
  31
  32 static  void      roff_term_pre_br(ROFF_TERM_ARGS);
  33 static  void      roff_term_pre_ce(ROFF_TERM_ARGS);
  34 static  void      roff_term_pre_ft(ROFF_TERM_ARGS);
  35 static  void      roff_term_pre_ll(ROFF_TERM_ARGS);
  36 static  void      roff_term_pre_mc(ROFF_TERM_ARGS);
  37 static  void      roff_term_pre_po(ROFF_TERM_ARGS);
  38 static  void      roff_term_pre_sp(ROFF_TERM_ARGS);
  39 static  void      roff_term_pre_ta(ROFF_TERM_ARGS);
  40 static  void      roff_term_pre_ti(ROFF_TERM_ARGS);
  41
  42 static  const roff_term_pre_fp roff_term_pre_acts[ROFF_MAX] = {
  43         roff_term_pre_br,  /* br */
  44         roff_term_pre_ce,  /* ce */
  45         roff_term_pre_br,  /* fi */
  46         roff_term_pre_ft,  /* ft */
  47         roff_term_pre_ll,  /* ll */
  48         roff_term_pre_mc,  /* mc */
  49         roff_term_pre_br,  /* nf */
  50         roff_term_pre_po,  /* po */
  51         roff_term_pre_ce,  /* rj */
  52         roff_term_pre_sp,  /* sp */
  53         roff_term_pre_ta,  /* ta */
  54         roff_term_pre_ti,  /* ti */
  55 };
  56
  57
  58 void
  59 roff_term_pre(struct termp *p, const struct roff_node *n)
  60 {
  61         assert(n->tok < ROFF_MAX);
  62         (*roff_term_pre_acts[n->tok])(p, n);
  63 }
  64
  65 static void
  66 roff_term_pre_br(ROFF_TERM_ARGS)
  67 {
  68         term_newln(p);
  69         if (p->flags & TERMP_BRIND) {
  70                 p->tcol->offset = p->tcol->rmargin;
  71                 p->tcol->rmargin = p->maxrmargin;
  72                 p->trailspace = 0;
  73                 p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
  74                 p->flags |= TERMP_NOSPACE;
  75         }
  76 }
  77
  78 static void
  79 roff_term_pre_ce(ROFF_TERM_ARGS)
  80 {
  81         const struct roff_node  *nc1, *nc2;
  82
  83         roff_term_pre_br(p, n);
  84         p->flags |= n->tok == ROFF_ce ? TERMP_CENTER : TERMP_RIGHT;
  85         nc1 = n->child->next;
  86         while (nc1 != NULL) {
  87                 nc2 = nc1;
  88                 do {
  89                         nc2 = nc2->next;
  90                 } while (nc2 != NULL && (nc2->type != ROFFT_TEXT ||
  91                     (nc2->flags & NODE_LINE) == 0));
  92                 while (nc1 != nc2) {
  93                         if (nc1->type == ROFFT_TEXT)
  94                                 term_word(p, nc1->string);
  95                         else
  96                                 roff_term_pre(p, nc1);
  97                         nc1 = nc1->next;
  98                 }
  99                 p->flags |= TERMP_NOSPACE;
 100                 term_flushln(p);
 101         }
 102         p->flags &= ~(TERMP_CENTER | TERMP_RIGHT);
 103 }
 104
 105 static void
 106 roff_term_pre_ft(ROFF_TERM_ARGS)
 107 {
 108         const char      *cp;
 109
 110         cp = n->child->string;
 111         switch (mandoc_font(cp, (int)strlen(cp))) {
 112         case ESCAPE_FONTBOLD:
 113                 term_fontrepl(p, TERMFONT_BOLD);
 114                 break;
 115         case ESCAPE_FONTITALIC:
 116                 term_fontrepl(p, TERMFONT_UNDER);
 117                 break;
 118         case ESCAPE_FONTBI:
 119                 term_fontrepl(p, TERMFONT_BI);
 120                 break;
 121         case ESCAPE_FONTPREV:
 122                 term_fontlast(p);
 123                 break;
 124         case ESCAPE_FONTROMAN:
 125         case ESCAPE_FONTCW:
 126                 term_fontrepl(p, TERMFONT_NONE);
 127                 break;
 128         default:
 129                 break;
 130         }
 131 }
 132
 133 static void
 134 roff_term_pre_ll(ROFF_TERM_ARGS)
 135 {
 136         term_setwidth(p, n->child != NULL ? n->child->string : NULL);
 137 }
 138
 139 static void
 140 roff_term_pre_mc(ROFF_TERM_ARGS)
 141 {
 142         if (p->col) {
 143                 p->flags |= TERMP_NOBREAK;
 144                 term_flushln(p);
 145                 p->flags &= ~(TERMP_NOBREAK | TERMP_NOSPACE);
 146         }
 147         if (n->child != NULL) {
 148                 p->mc = n->child->string;
 149                 p->flags |= TERMP_NEWMC;
 150         } else
 151                 p->flags |= TERMP_ENDMC;
 152 }
 153
 154 static void
 155 roff_term_pre_po(ROFF_TERM_ARGS)
 156 {
 157         struct roffsu    su;
 158         static int       po, polast;
 159         int              ponew;
 160
 161         if (n->child != NULL &&
 162             a2roffsu(n->child->string, &su, SCALE_EM) != NULL) {
 163                 ponew = term_hen(p, &su);
 164                 if (*n->child->string == '+' ||
 165                     *n->child->string == '-')
 166                         ponew += po;
 167         } else
 168                 ponew = polast;
 169         polast = po;
 170         po = ponew;
 171
 172         ponew = po - polast + (int)p->tcol->offset;
 173         p->tcol->offset = ponew > 0 ? ponew : 0;
 174 }
 175
 176 static void
 177 roff_term_pre_sp(ROFF_TERM_ARGS)
 178 {
 179         struct roffsu    su;
 180         int              len;
 181
 182         if (n->child != NULL) {
 183                 if (a2roffsu(n->child->string, &su, SCALE_VS) == NULL)
 184                         su.scale = 1.0;
 185                 len = term_vspan(p, &su);
 186         } else
 187                 len = 1;
 188
 189         if (len < 0)
 190                 p->skipvsp -= len;
 191         else
 192                 while (len--)
 193                         term_vspace(p);
 194
 195         roff_term_pre_br(p, n);
 196 }
 197
 198 static void
 199 roff_term_pre_ta(ROFF_TERM_ARGS)
 200 {
 201         term_tab_set(p, NULL);
 202         for (n = n->child; n != NULL; n = n->next)
 203                 term_tab_set(p, n->string);
 204 }
 205
 206 static void
 207 roff_term_pre_ti(ROFF_TERM_ARGS)
 208 {
 209         struct roffsu    su;
 210         const char      *cp;
 211         int              len, sign;
 212
 213         roff_term_pre_br(p, n);
 214
 215         if (n->child == NULL)
 216                 return;
 217         cp = n->child->string;
 218         if (*cp == '+') {
 219                 sign = 1;
 220                 cp++;
 221         } else if (*cp == '-') {
 222                 sign = -1;
 223                 cp++;
 224         } else
 225                 sign = 0;
 226
 227         if (a2roffsu(cp, &su, SCALE_EM) == NULL)
 228                 return;
 229         len = term_hen(p, &su);
 230
 231         if (sign == 0) {
 232                 p->ti = len - p->tcol->offset;
 233                 p->tcol->offset = len;
 234         } else if (sign == 1) {
 235                 p->ti = len;
 236                 p->tcol->offset += len;
 237         } else if ((size_t)len < p->tcol->offset) {
 238                 p->ti = -len;
 239                 p->tcol->offset -= len;
 240         } else {
 241                 p->ti = -p->tcol->offset;
 242                 p->tcol->offset = 0;
 243         }
 244 }