man_macro.c

   1 /*      $Id: man_macro.c,v 1.123 2017/06/25 11:45:37 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2012-2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
   5  * Copyright (c) 2013 Franco Fichtner <franco@lastsummer.de>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include "config.h"
  20
  21 #include <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "mandoc.h"
  29 #include "roff.h"
  30 #include "man.h"
  31 #include "libmandoc.h"
  32 #include "roff_int.h"
  33 #include "libman.h"
  34
  35 static  void             blk_close(MACRO_PROT_ARGS);
  36 static  void             blk_exp(MACRO_PROT_ARGS);
  37 static  void             blk_imp(MACRO_PROT_ARGS);
  38 static  void             in_line_eoln(MACRO_PROT_ARGS);
  39 static  int              man_args(struct roff_man *, int,
  40                                 int *, char *, char **);
  41 static  void             rew_scope(struct roff_man *, enum roff_tok);
  42
  43 const   struct man_macro __man_macros[MAN_MAX - MAN_TH] = {
  44         { in_line_eoln, MAN_BSCOPE }, /* TH */
  45         { blk_imp, MAN_BSCOPE | MAN_SCOPED }, /* SH */
  46         { blk_imp, MAN_BSCOPE | MAN_SCOPED }, /* SS */
  47         { blk_imp, MAN_BSCOPE | MAN_SCOPED }, /* TP */
  48         { blk_imp, MAN_BSCOPE }, /* LP */
  49         { blk_imp, MAN_BSCOPE }, /* PP */
  50         { blk_imp, MAN_BSCOPE }, /* P */
  51         { blk_imp, MAN_BSCOPE }, /* IP */
  52         { blk_imp, MAN_BSCOPE }, /* HP */
  53         { in_line_eoln, MAN_SCOPED | MAN_JOIN }, /* SM */
  54         { in_line_eoln, MAN_SCOPED | MAN_JOIN }, /* SB */
  55         { in_line_eoln, 0 }, /* BI */
  56         { in_line_eoln, 0 }, /* IB */
  57         { in_line_eoln, 0 }, /* BR */
  58         { in_line_eoln, 0 }, /* RB */
  59         { in_line_eoln, MAN_SCOPED | MAN_JOIN }, /* R */
  60         { in_line_eoln, MAN_SCOPED | MAN_JOIN }, /* B */
  61         { in_line_eoln, MAN_SCOPED | MAN_JOIN }, /* I */
  62         { in_line_eoln, 0 }, /* IR */
  63         { in_line_eoln, 0 }, /* RI */
  64         { in_line_eoln, MAN_NSCOPED }, /* nf */
  65         { in_line_eoln, MAN_NSCOPED }, /* fi */
  66         { blk_close, MAN_BSCOPE }, /* RE */
  67         { blk_exp, MAN_BSCOPE }, /* RS */
  68         { in_line_eoln, 0 }, /* DT */
  69         { in_line_eoln, 0 }, /* UC */
  70         { in_line_eoln, MAN_NSCOPED }, /* PD */
  71         { in_line_eoln, 0 }, /* AT */
  72         { in_line_eoln, MAN_NSCOPED }, /* in */
  73         { in_line_eoln, 0 }, /* OP */
  74         { in_line_eoln, MAN_BSCOPE }, /* EX */
  75         { in_line_eoln, MAN_BSCOPE }, /* EE */
  76         { blk_exp, MAN_BSCOPE }, /* UR */
  77         { blk_close, MAN_BSCOPE }, /* UE */
  78         { blk_exp, MAN_BSCOPE }, /* MT */
  79         { blk_close, MAN_BSCOPE }, /* ME */
  80 };
  81 const   struct man_macro *const man_macros = __man_macros - MAN_TH;
  82
  83
  84 void
  85 man_unscope(struct roff_man *man, const struct roff_node *to)
  86 {
  87         struct roff_node *n;
  88
  89         to = to->parent;
  90         n = man->last;
  91         while (n != to) {
  92
  93                 /* Reached the end of the document? */
  94
  95                 if (to == NULL && ! (n->flags & NODE_VALID)) {
  96                         if (man->flags & (MAN_BLINE | MAN_ELINE) &&
  97                             man_macros[n->tok].flags & MAN_SCOPED) {
  98                                 mandoc_vmsg(MANDOCERR_BLK_LINE,
  99                                     man->parse, n->line, n->pos,
 100                                     "EOF breaks %s", roff_name[n->tok]);
 101                                 if (man->flags & MAN_ELINE)
 102                                         man->flags &= ~MAN_ELINE;
 103                                 else {
 104                                         assert(n->type == ROFFT_HEAD);
 105                                         n = n->parent;
 106                                         man->flags &= ~MAN_BLINE;
 107                                 }
 108                                 man->last = n;
 109                                 n = n->parent;
 110                                 roff_node_delete(man, man->last);
 111                                 continue;
 112                         }
 113                         if (n->type == ROFFT_BLOCK &&
 114                             man_macros[n->tok].fp == blk_exp)
 115                                 mandoc_msg(MANDOCERR_BLK_NOEND,
 116                                     man->parse, n->line, n->pos,
 117                                     roff_name[n->tok]);
 118                 }
 119
 120                 /*
 121                  * We might delete the man->last node
 122                  * in the post-validation phase.
 123                  * Save a pointer to the parent such that
 124                  * we know where to continue the iteration.
 125                  */
 126
 127                 man->last = n;
 128                 n = n->parent;
 129                 man->last->flags |= NODE_VALID;
 130         }
 131
 132         /*
 133          * If we ended up at the parent of the node we were
 134          * supposed to rewind to, that means the target node
 135          * got deleted, so add the next node we parse as a child
 136          * of the parent instead of as a sibling of the target.
 137          */
 138
 139         man->next = (man->last == to) ?
 140             ROFF_NEXT_CHILD : ROFF_NEXT_SIBLING;
 141 }
 142
 143 /*
 144  * Rewinding entails ascending the parse tree until a coherent point,
 145  * for example, the `SH' macro will close out any intervening `SS'
 146  * scopes.  When a scope is closed, it must be validated and actioned.
 147  */
 148 static void
 149 rew_scope(struct roff_man *man, enum roff_tok tok)
 150 {
 151         struct roff_node *n;
 152
 153         /* Preserve empty paragraphs before RS. */
 154
 155         n = man->last;
 156         if (tok == MAN_RS && n->child == NULL &&
 157             (n->tok == MAN_P || n->tok == MAN_PP || n->tok == MAN_LP))
 158                 return;
 159
 160         for (;;) {
 161                 if (n->type == ROFFT_ROOT)
 162                         return;
 163                 if (n->flags & NODE_VALID) {
 164                         n = n->parent;
 165                         continue;
 166                 }
 167                 if (n->type != ROFFT_BLOCK) {
 168                         if (n->parent->type == ROFFT_ROOT) {
 169                                 man_unscope(man, n);
 170                                 return;
 171                         } else {
 172                                 n = n->parent;
 173                                 continue;
 174                         }
 175                 }
 176                 if (tok != MAN_SH && (n->tok == MAN_SH ||
 177                     (tok != MAN_SS && (n->tok == MAN_SS ||
 178                      man_macros[n->tok].fp == blk_exp))))
 179                         return;
 180                 man_unscope(man, n);
 181                 n = man->last;
 182         }
 183 }
 184
 185
 186 /*
 187  * Close out a generic explicit macro.
 188  */
 189 void
 190 blk_close(MACRO_PROT_ARGS)
 191 {
 192         enum roff_tok            ntok;
 193         const struct roff_node  *nn;
 194         char                    *p;
 195         int                      nrew, target;
 196
 197         nrew = 1;
 198         switch (tok) {
 199         case MAN_RE:
 200                 ntok = MAN_RS;
 201                 if ( ! man_args(man, line, pos, buf, &p))
 202                         break;
 203                 for (nn = man->last->parent; nn; nn = nn->parent)
 204                         if (nn->tok == ntok && nn->type == ROFFT_BLOCK)
 205                                 nrew++;
 206                 target = strtol(p, &p, 10);
 207                 if (*p != '\0')
 208                         mandoc_vmsg(MANDOCERR_ARG_EXCESS, man->parse,
 209                             line, p - buf, "RE ... %s", p);
 210                 if (target == 0)
 211                         target = 1;
 212                 nrew -= target;
 213                 if (nrew < 1) {
 214                         mandoc_vmsg(MANDOCERR_RE_NOTOPEN, man->parse,
 215                             line, ppos, "RE %d", target);
 216                         return;
 217                 }
 218                 break;
 219         case MAN_UE:
 220                 ntok = MAN_UR;
 221                 break;
 222         case MAN_ME:
 223                 ntok = MAN_MT;
 224                 break;
 225         default:
 226                 abort();
 227         }
 228
 229         for (nn = man->last->parent; nn; nn = nn->parent)
 230                 if (nn->tok == ntok && nn->type == ROFFT_BLOCK && ! --nrew)
 231                         break;
 232
 233         if (nn == NULL) {
 234                 mandoc_msg(MANDOCERR_BLK_NOTOPEN, man->parse,
 235                     line, ppos, roff_name[tok]);
 236                 rew_scope(man, MAN_PP);
 237         } else {
 238                 line = man->last->line;
 239                 ppos = man->last->pos;
 240                 ntok = man->last->tok;
 241                 man_unscope(man, nn);
 242
 243                 if (tok == MAN_RE && nn->head->aux > 0)
 244                         roff_setreg(man->roff, "an-margin",
 245                             nn->head->aux, '-');
 246
 247                 /* Move a trailing paragraph behind the block. */
 248
 249                 if (ntok == MAN_LP || ntok == MAN_PP || ntok == MAN_P) {
 250                         *pos = strlen(buf);
 251                         blk_imp(man, ntok, line, ppos, pos, buf);
 252                 }
 253         }
 254 }
 255
 256 void
 257 blk_exp(MACRO_PROT_ARGS)
 258 {
 259         struct roff_node *head;
 260         char            *p;
 261         int              la;
 262
 263         rew_scope(man, tok);
 264         roff_block_alloc(man, line, ppos, tok);
 265         head = roff_head_alloc(man, line, ppos, tok);
 266
 267         la = *pos;
 268         if (man_args(man, line, pos, buf, &p)) {
 269                 roff_word_alloc(man, line, la, p);
 270                 if (tok == MAN_RS) {
 271                         if (roff_getreg(man->roff, "an-margin") == 0)
 272                                 roff_setreg(man->roff, "an-margin",
 273                                     7 * 24, '=');
 274                         if ((head->aux = strtod(p, NULL) * 24.0) > 0)
 275                                 roff_setreg(man->roff, "an-margin",
 276                                     head->aux, '+');
 277                 }
 278         }
 279
 280         if (buf[*pos] != '\0')
 281                 mandoc_vmsg(MANDOCERR_ARG_EXCESS, man->parse, line,
 282                     *pos, "%s ... %s", roff_name[tok], buf + *pos);
 283
 284         man_unscope(man, head);
 285         roff_body_alloc(man, line, ppos, tok);
 286 }
 287
 288 /*
 289  * Parse an implicit-block macro.  These contain a ROFFT_HEAD and a
 290  * ROFFT_BODY contained within a ROFFT_BLOCK.  Rules for closing out other
 291  * scopes, such as `SH' closing out an `SS', are defined in the rew
 292  * routines.
 293  */
 294 void
 295 blk_imp(MACRO_PROT_ARGS)
 296 {
 297         int              la;
 298         char            *p;
 299         struct roff_node *n;
 300
 301         rew_scope(man, tok);
 302         n = roff_block_alloc(man, line, ppos, tok);
 303         if (n->tok == MAN_SH || n->tok == MAN_SS)
 304                 man->flags &= ~MAN_LITERAL;
 305         n = roff_head_alloc(man, line, ppos, tok);
 306
 307         /* Add line arguments. */
 308
 309         for (;;) {
 310                 la = *pos;
 311                 if ( ! man_args(man, line, pos, buf, &p))
 312                         break;
 313                 roff_word_alloc(man, line, la, p);
 314         }
 315
 316         /*
 317          * For macros having optional next-line scope,
 318          * keep the head open if there were no arguments.
 319          * For `TP', always keep the head open.
 320          */
 321
 322         if (man_macros[tok].flags & MAN_SCOPED &&
 323             (tok == MAN_TP || n == man->last)) {
 324                 man->flags |= MAN_BLINE;
 325                 return;
 326         }
 327
 328         /* Close out the head and open the body. */
 329
 330         man_unscope(man, n);
 331         roff_body_alloc(man, line, ppos, tok);
 332 }
 333
 334 void
 335 in_line_eoln(MACRO_PROT_ARGS)
 336 {
 337         int              la;
 338         char            *p;
 339         struct roff_node *n;
 340
 341         roff_elem_alloc(man, line, ppos, tok);
 342         n = man->last;
 343
 344         for (;;) {
 345                 if (buf[*pos] != '\0' && (tok == MAN_fi || tok == MAN_nf)) {
 346                         mandoc_vmsg(MANDOCERR_ARG_SKIP,
 347                             man->parse, line, *pos, "%s %s",
 348                             roff_name[tok], buf + *pos);
 349                         break;
 350                 }
 351                 if (buf[*pos] != '\0' && man->last != n && tok == MAN_PD) {
 352                         mandoc_vmsg(MANDOCERR_ARG_EXCESS,
 353                             man->parse, line, *pos, "%s ... %s",
 354                             roff_name[tok], buf + *pos);
 355                         break;
 356                 }
 357                 la = *pos;
 358                 if ( ! man_args(man, line, pos, buf, &p))
 359                         break;
 360                 if (man_macros[tok].flags & MAN_JOIN &&
 361                     man->last->type == ROFFT_TEXT)
 362                         roff_word_append(man, p);
 363                 else
 364                         roff_word_alloc(man, line, la, p);
 365         }
 366
 367         /*
 368          * Append NODE_EOS in case the last snipped argument
 369          * ends with a dot, e.g. `.IR syslog (3).'
 370          */
 371
 372         if (n != man->last &&
 373             mandoc_eos(man->last->string, strlen(man->last->string)))
 374                 man->last->flags |= NODE_EOS;
 375
 376         /*
 377          * If no arguments are specified and this is MAN_SCOPED (i.e.,
 378          * next-line scoped), then set our mode to indicate that we're
 379          * waiting for terms to load into our context.
 380          */
 381
 382         if (n == man->last && man_macros[tok].flags & MAN_SCOPED) {
 383                 assert( ! (man_macros[tok].flags & MAN_NSCOPED));
 384                 man->flags |= MAN_ELINE;
 385                 return;
 386         }
 387
 388         assert(man->last->type != ROFFT_ROOT);
 389         man->next = ROFF_NEXT_SIBLING;
 390
 391         /* Rewind our element scope. */
 392
 393         for ( ; man->last; man->last = man->last->parent) {
 394                 man_state(man, man->last);
 395                 if (man->last == n)
 396                         break;
 397         }
 398 }
 399
 400 void
 401 man_endparse(struct roff_man *man)
 402 {
 403
 404         man_unscope(man, man->first);
 405         man->flags &= ~MAN_LITERAL;
 406 }
 407
 408 static int
 409 man_args(struct roff_man *man, int line, int *pos, char *buf, char **v)
 410 {
 411         char     *start;
 412
 413         assert(*pos);
 414         *v = start = buf + *pos;
 415         assert(' ' != *start);
 416
 417         if ('\0' == *start)
 418                 return 0;
 419
 420         *v = mandoc_getarg(man->parse, v, line, pos);
 421         return 1;
 422 }