roff_term.c

   1 /*      $Id: roff_term.c,v 1.17 2018/12/16 00:17:02 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2010,2014,2015,2017,2018 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_ft,  /* ft */
  46         roff_term_pre_ll,  /* ll */
  47         roff_term_pre_mc,  /* mc */
  48         roff_term_pre_po,  /* po */
  49         roff_term_pre_ce,  /* rj */
  50         roff_term_pre_sp,  /* sp */
  51         roff_term_pre_ta,  /* ta */
  52         roff_term_pre_ti,  /* ti */
  53 };
  54
  55
  56 void
  57 roff_term_pre(struct termp *p, const struct roff_node *n)
  58 {
  59         assert(n->tok < ROFF_MAX);
  60         (*roff_term_pre_acts[n->tok])(p, n);
  61 }
  62
  63 static void
  64 roff_term_pre_br(ROFF_TERM_ARGS)
  65 {
  66         term_newln(p);
  67         if (p->flags & TERMP_BRIND) {
  68                 p->tcol->offset = p->tcol->rmargin;
  69                 p->tcol->rmargin = p->maxrmargin;
  70                 p->flags &= ~(TERMP_NOBREAK | TERMP_BRIND);
  71         }
  72 }
  73
  74 static void
  75 roff_term_pre_ce(ROFF_TERM_ARGS)
  76 {
  77         const struct roff_node  *nc1, *nc2;
  78         size_t                   len, lm;
  79
  80         roff_term_pre_br(p, n);
  81         lm = p->tcol->offset;
  82         nc1 = n->child->next;
  83         while (nc1 != NULL) {
  84                 nc2 = nc1;
  85                 len = 0;
  86                 do {
  87                         if (nc2->type == ROFFT_TEXT) {
  88                                 if (len)
  89                                         len++;
  90                                 len += term_strlen(p, nc2->string);
  91                         }
  92                         nc2 = nc2->next;
  93                 } while (nc2 != NULL && (nc2->type != ROFFT_TEXT ||
  94                     (nc2->flags & NODE_LINE) == 0));
  95                 p->tcol->offset = len >= p->tcol->rmargin ? 0 :
  96                     lm + len >= p->tcol->rmargin ? p->tcol->rmargin - len :
  97                     n->tok == ROFF_rj ? p->tcol->rmargin - len :
  98                     (lm + p->tcol->rmargin - len) / 2;
  99                 while (nc1 != nc2) {
 100                         if (nc1->type == ROFFT_TEXT)
 101                                 term_word(p, nc1->string);
 102                         else
 103                                 roff_term_pre(p, nc1);
 104                         nc1 = nc1->next;
 105                 }
 106                 p->flags |= TERMP_NOSPACE;
 107                 term_flushln(p);
 108         }
 109         p->tcol->offset = lm;
 110 }
 111
 112 static void
 113 roff_term_pre_ft(ROFF_TERM_ARGS)
 114 {
 115         const char      *cp;
 116
 117         cp = n->child->string;
 118         switch (mandoc_font(cp, (int)strlen(cp))) {
 119         case ESCAPE_FONTBOLD:
 120                 term_fontrepl(p, TERMFONT_BOLD);
 121                 break;
 122         case ESCAPE_FONTITALIC:
 123                 term_fontrepl(p, TERMFONT_UNDER);
 124                 break;
 125         case ESCAPE_FONTBI:
 126                 term_fontrepl(p, TERMFONT_BI);
 127                 break;
 128         case ESCAPE_FONTPREV:
 129                 term_fontlast(p);
 130                 break;
 131         case ESCAPE_FONTROMAN:
 132         case ESCAPE_FONTCW:
 133                 term_fontrepl(p, TERMFONT_NONE);
 134                 break;
 135         default:
 136                 break;
 137         }
 138 }
 139
 140 static void
 141 roff_term_pre_ll(ROFF_TERM_ARGS)
 142 {
 143         term_setwidth(p, n->child != NULL ? n->child->string : NULL);
 144 }
 145
 146 static void
 147 roff_term_pre_mc(ROFF_TERM_ARGS)
 148 {
 149         if (p->col) {
 150                 p->flags |= TERMP_NOBREAK;
 151                 term_flushln(p);
 152                 p->flags &= ~(TERMP_NOBREAK | TERMP_NOSPACE);
 153         }
 154         if (n->child != NULL) {
 155                 p->mc = n->child->string;
 156                 p->flags |= TERMP_NEWMC;
 157         } else
 158                 p->flags |= TERMP_ENDMC;
 159 }
 160
 161 static void
 162 roff_term_pre_po(ROFF_TERM_ARGS)
 163 {
 164         struct roffsu    su;
 165         static int       po, polast;
 166         int              ponew;
 167
 168         if (n->child != NULL &&
 169             a2roffsu(n->child->string, &su, SCALE_EM) != NULL) {
 170                 ponew = term_hen(p, &su);
 171                 if (*n->child->string == '+' ||
 172                     *n->child->string == '-')
 173                         ponew += po;
 174         } else
 175                 ponew = polast;
 176         polast = po;
 177         po = ponew;
 178
 179         ponew = po - polast + (int)p->tcol->offset;
 180         p->tcol->offset = ponew > 0 ? ponew : 0;
 181 }
 182
 183 static void
 184 roff_term_pre_sp(ROFF_TERM_ARGS)
 185 {
 186         struct roffsu    su;
 187         int              len;
 188
 189         if (n->child != NULL) {
 190                 if (a2roffsu(n->child->string, &su, SCALE_VS) == NULL)
 191                         su.scale = 1.0;
 192                 len = term_vspan(p, &su);
 193         } else
 194                 len = 1;
 195
 196         if (len < 0)
 197                 p->skipvsp -= len;
 198         else
 199                 while (len--)
 200                         term_vspace(p);
 201
 202         roff_term_pre_br(p, n);
 203 }
 204
 205 static void
 206 roff_term_pre_ta(ROFF_TERM_ARGS)
 207 {
 208         term_tab_set(p, NULL);
 209         for (n = n->child; n != NULL; n = n->next)
 210                 term_tab_set(p, n->string);
 211 }
 212
 213 static void
 214 roff_term_pre_ti(ROFF_TERM_ARGS)
 215 {
 216         struct roffsu    su;
 217         const char      *cp;
 218         int              len, sign;
 219
 220         roff_term_pre_br(p, n);
 221
 222         if (n->child == NULL)
 223                 return;
 224         cp = n->child->string;
 225         if (*cp == '+') {
 226                 sign = 1;
 227                 cp++;
 228         } else if (*cp == '-') {
 229                 sign = -1;
 230                 cp++;
 231         } else
 232                 sign = 0;
 233
 234         if (a2roffsu(cp, &su, SCALE_EM) == NULL)
 235                 return;
 236         len = term_hen(p, &su);
 237
 238         if (sign == 0) {
 239                 p->ti = len - p->tcol->offset;
 240                 p->tcol->offset = len;
 241         } else if (sign == 1) {
 242                 p->ti = len;
 243                 p->tcol->offset += len;
 244         } else if ((size_t)len < p->tcol->offset) {
 245                 p->ti = -len;
 246                 p->tcol->offset -= len;
 247         } else {
 248                 p->ti = -p->tcol->offset;
 249                 p->tcol->offset = 0;
 250         }
 251 }