bin/mandoc/tbl_layout.c

   1 /*      $Id: tbl_layout.c,v 1.48 2018/12/14 05:18:03 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 <stdint.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <time.h>
  28
  29 #include "mandoc_aux.h"
  30 #include "mandoc.h"
  31 #include "tbl.h"
  32 #include "libmandoc.h"
  33 #include "tbl_int.h"
  34
  35 struct  tbl_phrase {
  36         char             name;
  37         enum tbl_cellt   key;
  38 };
  39
  40 static  const struct tbl_phrase keys[] = {
  41         { 'c',           TBL_CELL_CENTRE },
  42         { 'r',           TBL_CELL_RIGHT },
  43         { 'l',           TBL_CELL_LEFT },
  44         { 'n',           TBL_CELL_NUMBER },
  45         { 's',           TBL_CELL_SPAN },
  46         { 'a',           TBL_CELL_LONG },
  47         { '^',           TBL_CELL_DOWN },
  48         { '-',           TBL_CELL_HORIZ },
  49         { '_',           TBL_CELL_HORIZ },
  50         { '=',           TBL_CELL_DHORIZ }
  51 };
  52
  53 #define KEYS_MAX ((int)(sizeof(keys)/sizeof(keys[0])))
  54
  55 static  void             mods(struct tbl_node *, struct tbl_cell *,
  56                                 int, const char *, int *);
  57 static  void             cell(struct tbl_node *, struct tbl_row *,
  58                                 int, const char *, int *);
  59 static  struct tbl_cell *cell_alloc(struct tbl_node *, struct tbl_row *,
  60                                 enum tbl_cellt);
  61
  62
  63 static void
  64 mods(struct tbl_node *tbl, struct tbl_cell *cp,
  65                 int ln, const char *p, int *pos)
  66 {
  67         char            *endptr;
  68         size_t           sz;
  69
  70 mod:
  71         while (p[*pos] == ' ' || p[*pos] == '\t')
  72                 (*pos)++;
  73
  74         /* Row delimiters and cell specifiers end modifier lists. */
  75
  76         if (strchr(".,-=^_ACLNRSaclnrs", p[*pos]) != NULL)
  77                 return;
  78
  79         /* Throw away parenthesised expression. */
  80
  81         if ('(' == p[*pos]) {
  82                 (*pos)++;
  83                 while (p[*pos] && ')' != p[*pos])
  84                         (*pos)++;
  85                 if (')' == p[*pos]) {
  86                         (*pos)++;
  87                         goto mod;
  88                 }
  89                 mandoc_msg(MANDOCERR_TBLLAYOUT_PAR, ln, *pos, NULL);
  90                 return;
  91         }
  92
  93         /* Parse numerical spacing from modifier string. */
  94
  95         if (isdigit((unsigned char)p[*pos])) {
  96                 cp->spacing = strtoull(p + *pos, &endptr, 10);
  97                 *pos = endptr - p;
  98                 goto mod;
  99         }
 100
 101         switch (tolower((unsigned char)p[(*pos)++])) {
 102         case 'b':
 103                 cp->flags |= TBL_CELL_BOLD;
 104                 goto mod;
 105         case 'd':
 106                 cp->flags |= TBL_CELL_BALIGN;
 107                 goto mod;
 108         case 'e':
 109                 cp->flags |= TBL_CELL_EQUAL;
 110                 goto mod;
 111         case 'f':
 112                 break;
 113         case 'i':
 114                 cp->flags |= TBL_CELL_ITALIC;
 115                 goto mod;
 116         case 'm':
 117                 mandoc_msg(MANDOCERR_TBLLAYOUT_MOD, ln, *pos, "m");
 118                 goto mod;
 119         case 'p':
 120         case 'v':
 121                 if (p[*pos] == '-' || p[*pos] == '+')
 122                         (*pos)++;
 123                 while (isdigit((unsigned char)p[*pos]))
 124                         (*pos)++;
 125                 goto mod;
 126         case 't':
 127                 cp->flags |= TBL_CELL_TALIGN;
 128                 goto mod;
 129         case 'u':
 130                 cp->flags |= TBL_CELL_UP;
 131                 goto mod;
 132         case 'w':
 133                 sz = 0;
 134                 if (p[*pos] == '(') {
 135                         (*pos)++;
 136                         while (p[*pos + sz] != '\0' && p[*pos + sz] != ')')
 137                                 sz++;
 138                 } else
 139                         while (isdigit((unsigned char)p[*pos + sz]))
 140                                 sz++;
 141                 if (sz) {
 142                         free(cp->wstr);
 143                         cp->wstr = mandoc_strndup(p + *pos, sz);
 144                         *pos += sz;
 145                         if (p[*pos] == ')')
 146                                 (*pos)++;
 147                 }
 148                 goto mod;
 149         case 'x':
 150                 cp->flags |= TBL_CELL_WMAX;
 151                 goto mod;
 152         case 'z':
 153                 cp->flags |= TBL_CELL_WIGN;
 154                 goto mod;
 155         case '|':
 156                 if (cp->vert < 2)
 157                         cp->vert++;
 158                 else
 159                         mandoc_msg(MANDOCERR_TBLLAYOUT_VERT,
 160                             ln, *pos - 1, NULL);
 161                 goto mod;
 162         default:
 163                 mandoc_msg(MANDOCERR_TBLLAYOUT_CHAR,
 164                     ln, *pos - 1, "%c", p[*pos - 1]);
 165                 goto mod;
 166         }
 167
 168         /* Ignore parenthised font names for now. */
 169
 170         if (p[*pos] == '(')
 171                 goto mod;
 172
 173         /* Support only one-character font-names for now. */
 174
 175         if (p[*pos] == '\0' || (p[*pos + 1] != ' ' && p[*pos + 1] != '.')) {
 176                 mandoc_msg(MANDOCERR_FT_BAD,
 177                     ln, *pos, "TS %s", p + *pos - 1);
 178                 if (p[*pos] != '\0')
 179                         (*pos)++;
 180                 if (p[*pos] != '\0')
 181                         (*pos)++;
 182                 goto mod;
 183         }
 184
 185         switch (p[(*pos)++]) {
 186         case '3':
 187         case 'B':
 188                 cp->flags |= TBL_CELL_BOLD;
 189                 goto mod;
 190         case '2':
 191         case 'I':
 192                 cp->flags |= TBL_CELL_ITALIC;
 193                 goto mod;
 194         case '1':
 195         case 'R':
 196                 goto mod;
 197         default:
 198                 mandoc_msg(MANDOCERR_FT_BAD,
 199                     ln, *pos - 1, "TS f%c", p[*pos - 1]);
 200                 goto mod;
 201         }
 202 }
 203
 204 static void
 205 cell(struct tbl_node *tbl, struct tbl_row *rp,
 206                 int ln, const char *p, int *pos)
 207 {
 208         int              i;
 209         enum tbl_cellt   c;
 210
 211         /* Handle leading vertical lines */
 212
 213         while (p[*pos] == ' ' || p[*pos] == '\t' || p[*pos] == '|') {
 214                 if (p[*pos] == '|') {
 215                         if (rp->vert < 2)
 216                                 rp->vert++;
 217                         else
 218                                 mandoc_msg(MANDOCERR_TBLLAYOUT_VERT,
 219                                     ln, *pos, NULL);
 220                 }
 221                 (*pos)++;
 222         }
 223
 224 again:
 225         while (p[*pos] == ' ' || p[*pos] == '\t')
 226                 (*pos)++;
 227
 228         if (p[*pos] == '.' || p[*pos] == '\0')
 229                 return;
 230
 231         /* Parse the column position (`c', `l', `r', ...). */
 232
 233         for (i = 0; i < KEYS_MAX; i++)
 234                 if (tolower((unsigned char)p[*pos]) == keys[i].name)
 235                         break;
 236
 237         if (i == KEYS_MAX) {
 238                 mandoc_msg(MANDOCERR_TBLLAYOUT_CHAR,
 239                     ln, *pos, "%c", p[*pos]);
 240                 (*pos)++;
 241                 goto again;
 242         }
 243         c = keys[i].key;
 244
 245         /* Special cases of spanners. */
 246
 247         if (c == TBL_CELL_SPAN) {
 248                 if (rp->last == NULL)
 249                         mandoc_msg(MANDOCERR_TBLLAYOUT_SPAN, 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, ln, *pos, NULL);
 255
 256         (*pos)++;
 257
 258         /* Allocate cell then parse its modifiers. */
 259
 260         mods(tbl, cell_alloc(tbl, rp, c), ln, p, pos);
 261 }
 262
 263 void
 264 tbl_layout(struct tbl_node *tbl, int ln, const char *p, int pos)
 265 {
 266         struct tbl_row  *rp;
 267
 268         rp = NULL;
 269         for (;;) {
 270                 /* Skip whitespace before and after each cell. */
 271
 272                 while (p[pos] == ' ' || p[pos] == '\t')
 273                         pos++;
 274
 275                 switch (p[pos]) {
 276                 case ',':  /* Next row on this input line. */
 277                         pos++;
 278                         rp = NULL;
 279                         continue;
 280                 case '\0':  /* Next row on next input line. */
 281                         return;
 282                 case '.':  /* End of layout. */
 283                         pos++;
 284                         tbl->part = TBL_PART_DATA;
 285
 286                         /*
 287                          * When the layout is completely empty,
 288                          * default to one left-justified column.
 289                          */
 290
 291                         if (tbl->first_row == NULL) {
 292                                 tbl->first_row = tbl->last_row =
 293                                     mandoc_calloc(1, sizeof(*rp));
 294                         }
 295                         if (tbl->first_row->first == NULL) {
 296                                 mandoc_msg(MANDOCERR_TBLLAYOUT_NONE,
 297                                     ln, pos, NULL);
 298                                 cell_alloc(tbl, tbl->first_row,
 299                                     TBL_CELL_LEFT);
 300                                 if (tbl->opts.lvert < tbl->first_row->vert)
 301                                         tbl->opts.lvert = tbl->first_row->vert;
 302                                 return;
 303                         }
 304
 305                         /*
 306                          * Search for the widest line
 307                          * along the left and right margins.
 308                          */
 309
 310                         for (rp = tbl->first_row; rp; rp = rp->next) {
 311                                 if (tbl->opts.lvert < rp->vert)
 312                                         tbl->opts.lvert = rp->vert;
 313                                 if (rp->last != NULL &&
 314                                     rp->last->col + 1 == tbl->opts.cols &&
 315                                     tbl->opts.rvert < rp->last->vert)
 316                                         tbl->opts.rvert = rp->last->vert;
 317
 318                                 /* If the last line is empty, drop it. */
 319
 320                                 if (rp->next != NULL &&
 321                                     rp->next->first == NULL) {
 322                                         free(rp->next);
 323                                         rp->next = NULL;
 324                                         tbl->last_row = rp;
 325                                 }
 326                         }
 327                         return;
 328                 default:  /* Cell. */
 329                         break;
 330                 }
 331
 332                 /*
 333                  * If the last line had at least one cell,
 334                  * start a new one; otherwise, continue it.
 335                  */
 336
 337                 if (rp == NULL) {
 338                         if (tbl->last_row == NULL ||
 339                             tbl->last_row->first != NULL) {
 340                                 rp = mandoc_calloc(1, sizeof(*rp));
 341                                 if (tbl->last_row)
 342                                         tbl->last_row->next = rp;
 343                                 else
 344                                         tbl->first_row = rp;
 345                                 tbl->last_row = rp;
 346                         } else
 347                                 rp = tbl->last_row;
 348                 }
 349                 cell(tbl, rp, ln, p, &pos);
 350         }
 351 }
 352
 353 static struct tbl_cell *
 354 cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos)
 355 {
 356         struct tbl_cell *p, *pp;
 357
 358         p = mandoc_calloc(1, sizeof(*p));
 359         p->spacing = SIZE_MAX;
 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 }