man_macro.c

   1 /*      $Id: man_macro.c,v 1.60 2011/03/23 15:33:57 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
   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 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include <assert.h>
  22 #include <ctype.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include "man.h"
  27 #include "mandoc.h"
  28 #include "libmandoc.h"
  29 #include "libman.h"
  30
  31 enum    rew {
  32         REW_REWIND,
  33         REW_NOHALT,
  34         REW_HALT
  35 };
  36
  37 static  int              blk_close(MACRO_PROT_ARGS);
  38 static  int              blk_exp(MACRO_PROT_ARGS);
  39 static  int              blk_imp(MACRO_PROT_ARGS);
  40 static  int              in_line_eoln(MACRO_PROT_ARGS);
  41 static  int              man_args(struct man *, int,
  42                                 int *, char *, char **);
  43
  44 static  int              rew_scope(enum man_type,
  45                                 struct man *, enum mant);
  46 static  enum rew         rew_dohalt(enum mant, enum man_type,
  47                                 const struct man_node *);
  48 static  enum rew         rew_block(enum mant, enum man_type,
  49                                 const struct man_node *);
  50 static  void             rew_warn(struct man *,
  51                                 struct man_node *, enum mandocerr);
  52
  53 const   struct man_macro __man_macros[MAN_MAX] = {
  54         { in_line_eoln, MAN_NSCOPED }, /* br */
  55         { in_line_eoln, 0 }, /* TH */
  56         { blk_imp, MAN_SCOPED }, /* SH */
  57         { blk_imp, MAN_SCOPED }, /* SS */
  58         { blk_imp, MAN_SCOPED | MAN_FSCOPED }, /* TP */
  59         { blk_imp, 0 }, /* LP */
  60         { blk_imp, 0 }, /* PP */
  61         { blk_imp, 0 }, /* P */
  62         { blk_imp, 0 }, /* IP */
  63         { blk_imp, 0 }, /* HP */
  64         { in_line_eoln, MAN_SCOPED }, /* SM */
  65         { in_line_eoln, MAN_SCOPED }, /* SB */
  66         { in_line_eoln, 0 }, /* BI */
  67         { in_line_eoln, 0 }, /* IB */
  68         { in_line_eoln, 0 }, /* BR */
  69         { in_line_eoln, 0 }, /* RB */
  70         { in_line_eoln, MAN_SCOPED }, /* R */
  71         { in_line_eoln, MAN_SCOPED }, /* B */
  72         { in_line_eoln, MAN_SCOPED }, /* I */
  73         { in_line_eoln, 0 }, /* IR */
  74         { in_line_eoln, 0 }, /* RI */
  75         { in_line_eoln, MAN_NSCOPED }, /* na */
  76         { in_line_eoln, MAN_NSCOPED }, /* sp */
  77         { in_line_eoln, 0 }, /* nf */
  78         { in_line_eoln, 0 }, /* fi */
  79         { blk_close, 0 }, /* RE */
  80         { blk_exp, MAN_EXPLICIT }, /* RS */
  81         { in_line_eoln, 0 }, /* DT */
  82         { in_line_eoln, 0 }, /* UC */
  83         { in_line_eoln, 0 }, /* PD */
  84         { in_line_eoln, 0 }, /* AT */
  85         { in_line_eoln, 0 }, /* in */
  86         { in_line_eoln, 0 }, /* ft */
  87 };
  88
  89 const   struct man_macro * const man_macros = __man_macros;
  90
  91
  92 /*
  93  * Warn when "n" is an explicit non-roff macro.
  94  */
  95 static void
  96 rew_warn(struct man *m, struct man_node *n, enum mandocerr er)
  97 {
  98
  99         if (er == MANDOCERR_MAX || MAN_BLOCK != n->type)
 100                 return;
 101         if (MAN_VALID & n->flags)
 102                 return;
 103         if ( ! (MAN_EXPLICIT & man_macros[n->tok].flags))
 104                 return;
 105
 106         assert(er < MANDOCERR_FATAL);
 107         man_nmsg(m, n, er);
 108 }
 109
 110
 111 /*
 112  * Rewind scope.  If a code "er" != MANDOCERR_MAX has been provided, it
 113  * will be used if an explicit block scope is being closed out.
 114  */
 115 int
 116 man_unscope(struct man *m, const struct man_node *to,
 117                 enum mandocerr er)
 118 {
 119         struct man_node *n;
 120
 121         assert(to);
 122
 123         /* LINTED */
 124         while (m->last != to) {
 125                 /*
 126                  * Save the parent here, because we may delete the
 127                  * m->last node in the post-validation phase and reset
 128                  * it to m->last->parent, causing a step in the closing
 129                  * out to be lost.
 130                  */
 131                 n = m->last->parent;
 132                 rew_warn(m, m->last, er);
 133                 if ( ! man_valid_post(m))
 134                         return(0);
 135                 m->last = n;
 136                 assert(m->last);
 137         }
 138
 139         rew_warn(m, m->last, er);
 140         if ( ! man_valid_post(m))
 141                 return(0);
 142
 143         m->next = MAN_ROOT == m->last->type ?
 144                 MAN_NEXT_CHILD : MAN_NEXT_SIBLING;
 145
 146         return(1);
 147 }
 148
 149
 150 static enum rew
 151 rew_block(enum mant ntok, enum man_type type, const struct man_node *n)
 152 {
 153
 154         if (MAN_BLOCK == type && ntok == n->parent->tok &&
 155                         MAN_BODY == n->parent->type)
 156                 return(REW_REWIND);
 157         return(ntok == n->tok ? REW_HALT : REW_NOHALT);
 158 }
 159
 160
 161 /*
 162  * There are three scope levels: scoped to the root (all), scoped to the
 163  * section (all less sections), and scoped to subsections (all less
 164  * sections and subsections).
 165  */
 166 static enum rew
 167 rew_dohalt(enum mant tok, enum man_type type, const struct man_node *n)
 168 {
 169         enum rew         c;
 170
 171         /* We cannot progress beyond the root ever. */
 172         if (MAN_ROOT == n->type)
 173                 return(REW_HALT);
 174
 175         assert(n->parent);
 176
 177         /* Normal nodes shouldn't go to the level of the root. */
 178         if (MAN_ROOT == n->parent->type)
 179                 return(REW_REWIND);
 180
 181         /* Already-validated nodes should be closed out. */
 182         if (MAN_VALID & n->flags)
 183                 return(REW_NOHALT);
 184
 185         /* First: rewind to ourselves. */
 186         if (type == n->type && tok == n->tok)
 187                 return(REW_REWIND);
 188
 189         /*
 190          * Next follow the implicit scope-smashings as defined by man.7:
 191          * section, sub-section, etc.
 192          */
 193
 194         switch (tok) {
 195         case (MAN_SH):
 196                 break;
 197         case (MAN_SS):
 198                 /* Rewind to a section, if a block. */
 199                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 200                         return(c);
 201                 break;
 202         case (MAN_RS):
 203                 /* Rewind to a subsection, if a block. */
 204                 if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
 205                         return(c);
 206                 /* Rewind to a section, if a block. */
 207                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 208                         return(c);
 209                 break;
 210         default:
 211                 /* Rewind to an offsetter, if a block. */
 212                 if (REW_NOHALT != (c = rew_block(MAN_RS, type, n)))
 213                         return(c);
 214                 /* Rewind to a subsection, if a block. */
 215                 if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
 216                         return(c);
 217                 /* Rewind to a section, if a block. */
 218                 if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
 219                         return(c);
 220                 break;
 221         }
 222
 223         return(REW_NOHALT);
 224 }
 225
 226
 227 /*
 228  * Rewinding entails ascending the parse tree until a coherent point,
 229  * for example, the `SH' macro will close out any intervening `SS'
 230  * scopes.  When a scope is closed, it must be validated and actioned.
 231  */
 232 static int
 233 rew_scope(enum man_type type, struct man *m, enum mant tok)
 234 {
 235         struct man_node *n;
 236         enum rew         c;
 237
 238         /* LINTED */
 239         for (n = m->last; n; n = n->parent) {
 240                 /*
 241                  * Whether we should stop immediately (REW_HALT), stop
 242                  * and rewind until this point (REW_REWIND), or keep
 243                  * rewinding (REW_NOHALT).
 244                  */
 245                 c = rew_dohalt(tok, type, n);
 246                 if (REW_HALT == c)
 247                         return(1);
 248                 if (REW_REWIND == c)
 249                         break;
 250         }
 251
 252         /*
 253          * Rewind until the current point.  Warn if we're a roff
 254          * instruction that's mowing over explicit scopes.
 255          */
 256         assert(n);
 257
 258         return(man_unscope(m, n, MANDOCERR_MAX));
 259 }
 260
 261
 262 /*
 263  * Close out a generic explicit macro.
 264  */
 265 /* ARGSUSED */
 266 int
 267 blk_close(MACRO_PROT_ARGS)
 268 {
 269         enum mant                ntok;
 270         const struct man_node   *nn;
 271
 272         switch (tok) {
 273         case (MAN_RE):
 274                 ntok = MAN_RS;
 275                 break;
 276         default:
 277                 abort();
 278                 /* NOTREACHED */
 279         }
 280
 281         for (nn = m->last->parent; nn; nn = nn->parent)
 282                 if (ntok == nn->tok)
 283                         break;
 284
 285         if (NULL == nn)
 286                 man_pmsg(m, line, ppos, MANDOCERR_NOSCOPE);
 287
 288         if ( ! rew_scope(MAN_BODY, m, ntok))
 289                 return(0);
 290         if ( ! rew_scope(MAN_BLOCK, m, ntok))
 291                 return(0);
 292
 293         return(1);
 294 }
 295
 296
 297 /* ARGSUSED */
 298 int
 299 blk_exp(MACRO_PROT_ARGS)
 300 {
 301         int              la;
 302         char            *p;
 303
 304         /*
 305          * Close out prior scopes.  "Regular" explicit macros cannot be
 306          * nested, but we allow roff macros to be placed just about
 307          * anywhere.
 308          */
 309
 310         if ( ! rew_scope(MAN_BODY, m, tok))
 311                 return(0);
 312         if ( ! rew_scope(MAN_BLOCK, m, tok))
 313                 return(0);
 314
 315         if ( ! man_block_alloc(m, line, ppos, tok))
 316                 return(0);
 317         if ( ! man_head_alloc(m, line, ppos, tok))
 318                 return(0);
 319
 320         for (;;) {
 321                 la = *pos;
 322                 if ( ! man_args(m, line, pos, buf, &p))
 323                         break;
 324                 if ( ! man_word_alloc(m, line, la, p))
 325                         return(0);
 326         }
 327
 328         assert(m);
 329         assert(tok != MAN_MAX);
 330
 331         if ( ! rew_scope(MAN_HEAD, m, tok))
 332                 return(0);
 333         return(man_body_alloc(m, line, ppos, tok));
 334 }
 335
 336
 337
 338 /*
 339  * Parse an implicit-block macro.  These contain a MAN_HEAD and a
 340  * MAN_BODY contained within a MAN_BLOCK.  Rules for closing out other
 341  * scopes, such as `SH' closing out an `SS', are defined in the rew
 342  * routines.
 343  */
 344 /* ARGSUSED */
 345 int
 346 blk_imp(MACRO_PROT_ARGS)
 347 {
 348         int              la;
 349         char            *p;
 350         struct man_node *n;
 351
 352         /* Close out prior scopes. */
 353
 354         if ( ! rew_scope(MAN_BODY, m, tok))
 355                 return(0);
 356         if ( ! rew_scope(MAN_BLOCK, m, tok))
 357                 return(0);
 358
 359         /* Allocate new block & head scope. */
 360
 361         if ( ! man_block_alloc(m, line, ppos, tok))
 362                 return(0);
 363         if ( ! man_head_alloc(m, line, ppos, tok))
 364                 return(0);
 365
 366         n = m->last;
 367
 368         /* Add line arguments. */
 369
 370         for (;;) {
 371                 la = *pos;
 372                 if ( ! man_args(m, line, pos, buf, &p))
 373                         break;
 374                 if ( ! man_word_alloc(m, line, la, p))
 375                         return(0);
 376         }
 377
 378         /* Close out head and open body (unless MAN_SCOPE). */
 379
 380         if (MAN_SCOPED & man_macros[tok].flags) {
 381                 /* If we're forcing scope (`TP'), keep it open. */
 382                 if (MAN_FSCOPED & man_macros[tok].flags) {
 383                         m->flags |= MAN_BLINE;
 384                         return(1);
 385                 } else if (n == m->last) {
 386                         m->flags |= MAN_BLINE;
 387                         return(1);
 388                 }
 389         }
 390
 391         if ( ! rew_scope(MAN_HEAD, m, tok))
 392                 return(0);
 393         return(man_body_alloc(m, line, ppos, tok));
 394 }
 395
 396
 397 /* ARGSUSED */
 398 int
 399 in_line_eoln(MACRO_PROT_ARGS)
 400 {
 401         int              la;
 402         char            *p;
 403         struct man_node *n;
 404
 405         if ( ! man_elem_alloc(m, line, ppos, tok))
 406                 return(0);
 407
 408         n = m->last;
 409
 410         for (;;) {
 411                 la = *pos;
 412                 if ( ! man_args(m, line, pos, buf, &p))
 413                         break;
 414                 if ( ! man_word_alloc(m, line, la, p))
 415                         return(0);
 416         }
 417
 418         /*
 419          * If no arguments are specified and this is MAN_SCOPED (i.e.,
 420          * next-line scoped), then set our mode to indicate that we're
 421          * waiting for terms to load into our context.
 422          */
 423
 424         if (n == m->last && MAN_SCOPED & man_macros[tok].flags) {
 425                 assert( ! (MAN_NSCOPED & man_macros[tok].flags));
 426                 m->flags |= MAN_ELINE;
 427                 return(1);
 428         }
 429
 430         /* Set ignorable context, if applicable. */
 431
 432         if (MAN_NSCOPED & man_macros[tok].flags) {
 433                 assert( ! (MAN_SCOPED & man_macros[tok].flags));
 434                 m->flags |= MAN_ILINE;
 435         }
 436
 437         /*
 438          * Rewind our element scope.  Note that when TH is pruned, we'll
 439          * be back at the root, so make sure that we don't clobber as
 440          * its sibling.
 441          */
 442
 443         for ( ; m->last; m->last = m->last->parent) {
 444                 if (m->last == n)
 445                         break;
 446                 if (m->last->type == MAN_ROOT)
 447                         break;
 448                 if ( ! man_valid_post(m))
 449                         return(0);
 450         }
 451
 452         assert(m->last);
 453
 454         /*
 455          * Same here regarding whether we're back at the root.
 456          */
 457
 458         if (m->last->type != MAN_ROOT && ! man_valid_post(m))
 459                 return(0);
 460
 461         m->next = MAN_ROOT == m->last->type ?
 462                 MAN_NEXT_CHILD : MAN_NEXT_SIBLING;
 463
 464         return(1);
 465 }
 466
 467
 468 int
 469 man_macroend(struct man *m)
 470 {
 471
 472         return(man_unscope(m, m->first, MANDOCERR_SCOPEEXIT));
 473 }
 474
 475 static int
 476 man_args(struct man *m, int line, int *pos, char *buf, char **v)
 477 {
 478         char     *start;
 479
 480         assert(*pos);
 481         *v = start = buf + *pos;
 482         assert(' ' != *start);
 483
 484         if ('\0' == *start)
 485                 return(0);
 486
 487         *v = mandoc_getarg(m->parse, v, line, pos);
 488         return(1);
 489 }