tbl_layout.c

   1 /*      $Id: tbl_layout.c,v 1.38 2015/02/10 11:03:13 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2012, 2014, 2015 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
  66 mod:
  67         while (p[*pos] == ' ' || p[*pos] == '\t')
  68                 (*pos)++;
  69
  70         /* Row delimiters and cell specifiers end modifier lists. */
  71
  72         if (strchr(".,-=^_ACLNRSaclnrs", p[*pos]) != NULL)
  73                 return;
  74
  75         /* Throw away parenthesised expression. */
  76
  77         if ('(' == p[*pos]) {
  78                 (*pos)++;
  79                 while (p[*pos] && ')' != p[*pos])
  80                         (*pos)++;
  81                 if (')' == p[*pos]) {
  82                         (*pos)++;
  83                         goto mod;
  84                 }
  85                 mandoc_msg(MANDOCERR_TBLLAYOUT_PAR, tbl->parse,
  86                     ln, *pos, NULL);
  87                 return;
  88         }
  89
  90         /* Parse numerical spacing from modifier string. */
  91
  92         if (isdigit((unsigned char)p[*pos])) {
  93                 cp->spacing = strtoull(p + *pos, &endptr, 10);
  94                 *pos = endptr - p;
  95                 goto mod;
  96         }
  97
  98         switch (tolower((unsigned char)p[(*pos)++])) {
  99         case 'b':
 100                 cp->flags |= TBL_CELL_BOLD;
 101                 goto mod;
 102         case 'd':
 103                 cp->flags |= TBL_CELL_BALIGN;
 104                 goto mod;
 105         case 'e':
 106                 cp->flags |= TBL_CELL_EQUAL;
 107                 goto mod;
 108         case 'f':
 109                 break;
 110         case 'i':
 111                 cp->flags |= TBL_CELL_ITALIC;
 112                 goto mod;
 113         case 'm':
 114                 mandoc_msg(MANDOCERR_TBLLAYOUT_MOD, tbl->parse,
 115                     ln, *pos, "m");
 116                 goto mod;
 117         case 'p':
 118                 /* FALLTHROUGH */
 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':  /* XXX for now, ignore minimal column width */
 132                 goto mod;
 133         case 'x':
 134                 cp->flags |= TBL_CELL_WMAX;
 135                 goto mod;
 136         case 'z':
 137                 cp->flags |= TBL_CELL_WIGN;
 138                 goto mod;
 139         case '|':
 140                 if (cp->vert < 2)
 141                         cp->vert++;
 142                 else
 143                         mandoc_msg(MANDOCERR_TBLLAYOUT_VERT,
 144                             tbl->parse, ln, *pos - 1, NULL);
 145                 goto mod;
 146         default:
 147                 mandoc_vmsg(MANDOCERR_TBLLAYOUT_CHAR, tbl->parse,
 148                     ln, *pos - 1, "%c", p[*pos - 1]);
 149                 goto mod;
 150         }
 151
 152         /* Ignore parenthised font names for now. */
 153
 154         if (p[*pos] == '(')
 155                 goto mod;
 156
 157         /* Support only one-character font-names for now. */
 158
 159         if (p[*pos] == '\0' || (p[*pos + 1] != ' ' && p[*pos + 1] != '.')) {
 160                 mandoc_vmsg(MANDOCERR_FT_BAD, tbl->parse,
 161                     ln, *pos, "TS %s", p + *pos - 1);
 162                 if (p[*pos] != '\0')
 163                         (*pos)++;
 164                 if (p[*pos] != '\0')
 165                         (*pos)++;
 166                 goto mod;
 167         }
 168
 169         switch (p[(*pos)++]) {
 170         case '3':
 171                 /* FALLTHROUGH */
 172         case 'B':
 173                 cp->flags |= TBL_CELL_BOLD;
 174                 goto mod;
 175         case '2':
 176                 /* FALLTHROUGH */
 177         case 'I':
 178                 cp->flags |= TBL_CELL_ITALIC;
 179                 goto mod;
 180         case '1':
 181                 /* FALLTHROUGH */
 182         case 'R':
 183                 goto mod;
 184         default:
 185                 mandoc_vmsg(MANDOCERR_FT_BAD, tbl->parse,
 186                     ln, *pos - 1, "TS f%c", p[*pos - 1]);
 187                 goto mod;
 188         }
 189 }
 190
 191 static void
 192 cell(struct tbl_node *tbl, struct tbl_row *rp,
 193                 int ln, const char *p, int *pos)
 194 {
 195         int              i;
 196         enum tbl_cellt   c;
 197
 198         /* Handle leading vertical lines */
 199
 200         while (p[*pos] == ' ' || p[*pos] == '\t' || p[*pos] == '|') {
 201                 if (p[*pos] == '|') {
 202                         if (rp->vert < 2)
 203                                 rp->vert++;
 204                         else
 205                                 mandoc_msg(MANDOCERR_TBLLAYOUT_VERT,
 206                                     tbl->parse, ln, *pos, NULL);
 207                 }
 208                 (*pos)++;
 209         }
 210
 211 again:
 212         while (p[*pos] == ' ' || p[*pos] == '\t')
 213                 (*pos)++;
 214
 215         if (p[*pos] == '.' || p[*pos] == '\0')
 216                 return;
 217
 218         /* Parse the column position (`c', `l', `r', ...). */
 219
 220         for (i = 0; i < KEYS_MAX; i++)
 221                 if (tolower((unsigned char)p[*pos]) == keys[i].name)
 222                         break;
 223
 224         if (i == KEYS_MAX) {
 225                 mandoc_vmsg(MANDOCERR_TBLLAYOUT_CHAR, tbl->parse,
 226                     ln, *pos, "%c", p[*pos]);
 227                 (*pos)++;
 228                 goto again;
 229         }
 230         c = keys[i].key;
 231
 232         /* Special cases of spanners. */
 233
 234         if (c == TBL_CELL_SPAN) {
 235                 if (rp->last == NULL)
 236                         mandoc_msg(MANDOCERR_TBLLAYOUT_SPAN,
 237                             tbl->parse, ln, *pos, NULL);
 238                 else if (rp->last->pos == TBL_CELL_HORIZ ||
 239                     rp->last->pos == TBL_CELL_DHORIZ)
 240                         c = rp->last->pos;
 241         } else if (c == TBL_CELL_DOWN && rp == tbl->first_row)
 242                 mandoc_msg(MANDOCERR_TBLLAYOUT_DOWN,
 243                     tbl->parse, ln, *pos, NULL);
 244
 245         (*pos)++;
 246
 247         /* Allocate cell then parse its modifiers. */
 248
 249         mods(tbl, cell_alloc(tbl, rp, c), ln, p, pos);
 250 }
 251
 252 void
 253 tbl_layout(struct tbl_node *tbl, int ln, const char *p, int pos)
 254 {
 255         struct tbl_row  *rp;
 256
 257         rp = NULL;
 258         for (;;) {
 259                 /* Skip whitespace before and after each cell. */
 260
 261                 while (p[pos] == ' ' || p[pos] == '\t')
 262                         pos++;
 263
 264                 switch (p[pos]) {
 265                 case ',':  /* Next row on this input line. */
 266                         pos++;
 267                         rp = NULL;
 268                         continue;
 269                 case '\0':  /* Next row on next input line. */
 270                         return;
 271                 case '.':  /* End of layout. */
 272                         pos++;
 273                         tbl->part = TBL_PART_DATA;
 274
 275                         /*
 276                          * When the layout is completely empty,
 277                          * default to one left-justified column.
 278                          */
 279
 280                         if (tbl->first_row == NULL) {
 281                                 tbl->first_row = tbl->last_row =
 282                                     mandoc_calloc(1, sizeof(*rp));
 283                         }
 284                         if (tbl->first_row->first == NULL) {
 285                                 mandoc_msg(MANDOCERR_TBLLAYOUT_NONE,
 286                                     tbl->parse, ln, pos, NULL);
 287                                 cell_alloc(tbl, tbl->first_row,
 288                                     TBL_CELL_LEFT);
 289                                 return;
 290                         }
 291
 292                         /*
 293                          * Search for the widest line
 294                          * along the left and right margins.
 295                          */
 296
 297                         for (rp = tbl->first_row; rp; rp = rp->next) {
 298                                 if (tbl->opts.lvert < rp->vert)
 299                                         tbl->opts.lvert = rp->vert;
 300                                 if (rp->last != NULL &&
 301                                     rp->last->col + 1 == tbl->opts.cols &&
 302                                     tbl->opts.rvert < rp->last->vert)
 303                                         tbl->opts.rvert = rp->last->vert;
 304
 305                                 /* If the last line is empty, drop it. */
 306
 307                                 if (rp->next != NULL &&
 308                                     rp->next->first == NULL) {
 309                                         free(rp->next);
 310                                         rp->next = NULL;
 311                                 }
 312                         }
 313                         return;
 314                 default:  /* Cell. */
 315                         break;
 316                 }
 317
 318                 /*
 319                  * If the last line had at least one cell,
 320                  * start a new one; otherwise, continue it.
 321                  */
 322
 323                 if (rp == NULL) {
 324                         if (tbl->last_row == NULL ||
 325                             tbl->last_row->first != NULL) {
 326                                 rp = mandoc_calloc(1, sizeof(*rp));
 327                                 if (tbl->last_row)
 328                                         tbl->last_row->next = rp;
 329                                 else
 330                                         tbl->first_row = rp;
 331                                 tbl->last_row = rp;
 332                         } else
 333                                 rp = tbl->last_row;
 334                 }
 335                 cell(tbl, rp, ln, p, &pos);
 336         }
 337 }
 338
 339 static struct tbl_cell *
 340 cell_alloc(struct tbl_node *tbl, struct tbl_row *rp, enum tbl_cellt pos)
 341 {
 342         struct tbl_cell *p, *pp;
 343
 344         p = mandoc_calloc(1, sizeof(*p));
 345         p->pos = pos;
 346
 347         if ((pp = rp->last) != NULL) {
 348                 pp->next = p;
 349                 p->col = pp->col + 1;
 350         } else
 351                 rp->first = p;
 352         rp->last = p;
 353
 354         if (tbl->opts.cols <= p->col)
 355                 tbl->opts.cols = p->col + 1;
 356
 357         return(p);
 358 }