tbl_layout.c

   1 /*      $Id: tbl_layout.c,v 1.43 2017/06/13 16:12:01 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2012, 2014, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include "config.h"
  19
  20 #include <sys/types.h>
  21
  22 #include <ctype.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <time.h>
  26
  27 #include "mandoc.h"
  28 #include "mandoc_aux.h"
  29 #include "libmandoc.h"
  30 #include "libroff.h"
  31
  32 struct  tbl_phrase {
  33         char             name;
  34         enum tbl_cellt   key;
  35 };
  36
  37 static  const struct tbl_phrase keys[] = {
  38         { 'c',           TBL_CELL_CENTRE },
  39         { 'r',           TBL_CELL_RIGHT },
  40         { 'l',           TBL_CELL_LEFT },
  41         { 'n',           TBL_CELL_NUMBER },
  42         { 's',           TBL_CELL_SPAN },
  43         { 'a',           TBL_CELL_LONG },
  44         { '^',           TBL_CELL_DOWN },
  45         { '-',           TBL_CELL_HORIZ },
  46         { '_',           TBL_CELL_HORIZ },
  47         { '=',           TBL_CELL_DHORIZ }
  48 };
  49
  50 #define KEYS_MAX ((int)(sizeof(keys)/sizeof(keys[0])))
  51
  52 static  void             mods(struct tbl_node *, struct tbl_cell *,
  53                                 int, const char *, int *);
  54 static  void             cell(struct tbl_node *, struct tbl_row *,
  55                                 int, const char *, int *);
  56 static  struct tbl_cell *cell_alloc(struct tbl_node *, struct tbl_row *,
  57                                 enum tbl_cellt);
  58
  59
  60 static void
  61 mods(struct tbl_node *tbl, struct tbl_cell *cp,
  62                 int ln, const char *p, int *pos)
  63 {
  64         char            *endptr;
  65         size_t           sz;
  66
  67 mod:
  68         while (p[*pos] == ' ' || p[*pos] == '\t')
  69                 (*pos)++;
  70
  71         /* Row delimiters and cell specifiers end modifier lists. */
  72
  73         if (strchr(".,-=^_ACLNRSaclnrs", p[*pos]) != NULL)
  74                 return;
  75
  76         /* Throw away parenthesised expression. */
  77
  78         if ('(' == p[*pos]) {
  79                 (*pos)++;
  80                 while (p[*pos] && ')' != p[*pos])
  81                         (*pos)++;
  82                 if (')' == p[*pos]) {
  83                         (*pos)++;
  84                         goto mod;
  85                 }
  86                 mandoc_msg(MANDOCERR_TBLLAYOUT_PAR, tbl->parse,
  87                     ln, *pos, NULL);
  88                 return;
  89         }
  90
  91         /* Parse numerical spacing from modifier string. */
  92
  93         if (isdigit((unsigned char)p[*pos])) {
  94                 cp->spacing = strtoull(p + *pos, &endptr, 10);
  95                 *pos = endptr - p;
  96                 goto mod;
  97         }
  98
  99         switch (tolower((unsigned char)p[(*pos)++])) {
 100         case 'b':
 101                 cp->flags |= TBL_CELL_BOLD;
 102                 goto mod;
 103         case 'd':
 104                 cp->flags |= TBL_CELL_BALIGN;
 105                 goto mod;
 106         case 'e':
 107                 cp->flags |= TBL_CELL_EQUAL;
 108                 goto mod;
 109         case 'f':
 110                 break;
 111         case 'i':
 112                 cp->flags |= TBL_CELL_ITALIC;
 113                 goto mod;
 114         case 'm':
 115                 mandoc_msg(MANDOCERR_TBLLAYOUT_MOD, tbl->parse,
 116                     ln, *pos, "m");
 117                 goto mod;
 118         case 'p':
 119         case 'v':
 120                 if (p[*pos] == '-' || p[*pos] == '+')
 121                         (*pos)++;
 122                 while (isdigit((unsigned char)p[*pos]))
 123                         (*pos)++;
 124                 goto mod;
 125         case 't':
 126                 cp->flags |= TBL_CELL_TALIGN;
 127                 goto mod;
 128         case 'u':
 129                 cp->flags |= TBL_CELL_UP;
 130                 goto mod;
 131         case 'w':
 132                 sz = 0;
 133                 if (p[*pos] == '(') {
 134                         (*pos)++;
 135                         while (p[*pos + sz] != '\0' && p[*pos + sz] != ')')
 136                                 sz++;
 137                 } else
 138                         while (isdigit((unsigned char)p[*pos + sz]))
 139                                 sz++;
 140                 if (sz) {
 141                         free(cp->wstr);
 142                         cp->wstr = mandoc_strndup(p + *pos, sz);
 143                         *pos += sz;
 144                         if (p[*pos] == ')')
 145                                 (*pos)++;
 146                 }
 147                 goto mod;
 148         case 'x':
 149                 cp->flags |= TBL_CELL_WMAX;
 150                 goto mod;
 151         case 'z':
 152                 cp->flags |= TBL_CELL_WIGN;
 153                 goto mod;
 154         case '|':
 155                 if (cp->vert < 2)
 156                         cp->vert++;
 157                 else
 158                         mandoc_msg(MANDOCERR_TBLLAYOUT_VERT,
 159                             tbl->parse, ln, *pos - 1, NULL);
 160                 goto mod;
 161         default:
 162                 mandoc_vmsg(MANDOCERR_TBLLAYOUT_CHAR, tbl->parse,
 163                     ln, *pos - 1, "%c", p[*pos - 1]);
 164                 goto mod;
 165         }
 166
 167         /* Ignore parenthised font names for now. */
 168
 169         if (p[*pos] == '(')
 170                 goto mod;
 171
 172         /* Support only one-character font-names for now. */
 173
 174         if (p[*pos] == '\0' || (p[*pos + 1] != ' ' && p[*pos + 1] != '.')) {
 175                 mandoc_vmsg(MANDOCERR_FT_BAD, tbl->parse,
 176                     ln, *pos, "TS %s", p + *pos - 1);
 177                 if (p[*pos] != '\0')
 178                         (*pos)++;
 179                 if (p[*pos] != '\0')
 180                         (*pos)++;
 181                 goto mod;
 182         }
 183
 184         switch (p[(*pos)++]) {
 185         case '3':
 186         case 'B':
 187                 cp->flags |= TBL_CELL_BOLD;
 188                 goto mod;
 189         case '2':
 190         case 'I':
 191                 cp->flags |= TBL_CELL_ITALIC;
 192                 goto mod;
 193         case '1':
 194         case 'R':
 195                 goto mod;
 196         default:
 197                 mandoc_vmsg(MANDOCERR_FT_BAD, tbl->parse,
 198                     ln, *pos - 1, "TS f%c", p[*pos - 1]);
 199                 goto mod;
 200         }
 201 }
 202
 203 static void
 204 cell(struct tbl_node *tbl, struct tbl_row *rp,
 205                 int ln, const char *p, int *pos)
 206 {
 207         int              i;
 208         enum tbl_cellt   c;
 209
 210         /* Handle leading vertical lines */
 211
 212         while (p[*pos] == ' ' || p[*pos] == '\t' || p[*pos] == '|') {
 213                 if (p[*pos] == '|') {
 214                         if (rp->vert < 2)
 215                                 rp->vert++;
 216                         else
 217                                 mandoc_msg(MANDOCERR_TBLLAYOUT_VERT,
 218                                     tbl->parse, ln, *pos, NULL);
 219                 }
 220                 (*pos)++;
 221         }
 222
 223 again:
 224         while (p[*pos] == ' ' || p[*pos] == '\t')
 225                 (*pos)++;
 226
 227         if (p[*pos] == '.' || p[*pos] == '\0')
 228                 return;
 229
 230         /* Parse the column position (`c', `l', `r', ...). */
 231
 232         for (i = 0; i < KEYS_MAX; i++)
 233                 if (tolower((unsigned char)p[*pos]) == keys[i].name)
 234                         break;
 235
 236         if (i == KEYS_MAX) {
 237                 mandoc_vmsg(MANDOCERR_TBLLAYOUT_CHAR, tbl->parse,
 238                     ln, *pos, "%c", p[*pos]);
 239                 (*pos)++;
 240                 goto again;
 241         }
 242         c = keys[i].key;
 243
 244         /* Special cases of spanners. */
 245
 246         if (c == TBL_CELL_SPAN) {
 247                 if (rp->last == NULL)
 248                         mandoc_msg(MANDOCERR_TBLLAYOUT_SPAN,
 249                             tbl->parse, ln, *pos, NULL);
 250                 else if (rp->last->pos == TBL_CELL_HORIZ ||
 251                     rp->last->pos == TBL_CELL_DHORIZ)
 252                         c = rp->last->pos;
 253         } else if (c == TBL_CELL_DOWN && rp == tbl->first_row)
 254                 mandoc_msg(MANDOCERR_TBLLAYOUT_DOWN,
 255                     tbl->parse, ln, *pos, NULL);
 256
 257         (*pos)++;
 258
 259         /* Allocate cell then parse its modifiers. */
 260
 261         mods(tbl, cell_alloc(tbl, rp, c), ln, p, pos);
 262 }
 263
 264 void
 265 tbl_layout(struct tbl_node *tbl, int ln, const char *p, int pos)
 266 {
 267         struct tbl_row  *rp;
 268
 269         rp = NULL;
 270         for (;;) {
 271                 /* Skip whitespace before and after each cell. */
 272
 273                 while (p[pos] == ' ' || p[pos] == '\t')
 274                         pos++;
 275
 276                 switch (p[pos]) {
 277                 case ',':  /* Next row on this input line. */
 278                         pos++;
 279                         rp = NULL;
 280                         continue;
 281                 case '\0':  /* Next row on next input line. */
 282                         return;
 283                 case '.':  /* End of layout. */
 284                         pos++;
 285                         tbl->part = TBL_PART_DATA;
 286
 287                         /*
 288                          * When the layout is completely empty,
 289                          * default to one left-justified column.
 290                          */
 291
 292                         if (tbl->first_row == NULL) {
 293                                 tbl->first_row = tbl->last_row =
 294                                     mandoc_calloc(1, sizeof(*rp));
 295                         }
 296                         if (tbl->first_row->first == NULL) {
 297                                 mandoc_msg(MANDOCERR_TBLLAYOUT_NONE,
 298                                     tbl->parse, ln, pos, NULL);
 299                                 cell_alloc(tbl, tbl->first_row,
 300                                     TBL_CELL_LEFT);
 301                                 if (tbl->opts.lvert < tbl->first_row->vert)
 302                                         tbl->opts.lvert = tbl->first_row->vert;
 303                                 return;
 304                         }
 305
 306                         /*
 307                          * Search for the widest line
 308                          * along the left and right margins.
 309                          */
 310
 311                         for (rp = tbl->first_row; rp; rp = rp->next) {
 312                                 if (tbl->opts.lvert < rp->vert)
 313                                         tbl->opts.lvert = rp->vert;
 314                                 if (rp->last != NULL &&
 315                                     rp->last->col + 1 == tbl->opts.cols &&
 316                                     tbl->opts.rvert < rp->last->vert)
 317                                         tbl->opts.rvert = rp->last->vert;
 318
 319                                 /* If the last line is empty, drop it. */
 320
 321                                 if (rp->next != NULL &&
 322                                     rp->next->first == NULL) {
 323                                         free(rp->next);
 324                                         rp->next = NULL;
 325                                         tbl->last_row = rp;
 326                                 }
 327                         }
 328                         return;
 329                 default:  /* Cell. */
 330                         break;
 331                 }
 332
 333                 /*
 334                  * If the last line had at least one cell,
 335                  * start a new one; otherwise, continue it.
 336                  */
 337
 338                 if (rp == NULL) {
 339                         if (tbl->last_row == NULL ||
 340                             tbl->last_row->first != NULL) {
 341                                 rp = mandoc_calloc(1, sizeof(*rp));
 342                                 if (tbl->last_row)
 343                                         tbl->last_row->next = rp;
 344                                 else
 345                                         tbl->first_row = rp;
 346                                 tbl->last_row = rp;
 347                         } else
 348                                 rp = tbl->last_row;
 349                 }
 350                 cell(tbl, rp, ln, p, &pos);
 351         }
 352 }
 353
 354 static struct tbl_cell *
 355 cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos)
 356 {
 357         struct tbl_cell *p, *pp;
 358
 359         p = mandoc_calloc(1, sizeof(*p));
 360         p->pos = pos;
 361
 362         if ((pp = rp->last) != NULL) {
 363                 pp->next = p;
 364                 p->col = pp->col + 1;
 365         } else
 366                 rp->first = p;
 367         rp->last = p;
 368
 369         if (tbl->opts.cols <= p->col)
 370                 tbl->opts.cols = p->col + 1;
 371
 372         return p;
 373 }