mdoc_validate.c

   1 /*      $Id: mdoc_validate.c,v 1.125 2010/11/29 13:51:03 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 <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <limits.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "mandoc.h"
  31 #include "libmdoc.h"
  32 #include "libmandoc.h"
  33
  34 /* FIXME: .Bl -diag can't have non-text children in HEAD. */
  35
  36 #define PRE_ARGS  struct mdoc *mdoc, struct mdoc_node *n
  37 #define POST_ARGS struct mdoc *mdoc
  38
  39 enum    check_ineq {
  40         CHECK_LT,
  41         CHECK_GT,
  42         CHECK_EQ
  43 };
  44
  45 enum    check_lvl {
  46         CHECK_WARN,
  47         CHECK_ERROR,
  48         CHECK_FATAL
  49 };
  50
  51 typedef int     (*v_pre)(PRE_ARGS);
  52 typedef int     (*v_post)(POST_ARGS);
  53
  54 struct  valids {
  55         v_pre   *pre;
  56         v_post  *post;
  57 };
  58
  59 static  int      check_count(struct mdoc *, enum mdoc_type,
  60                         enum check_lvl, enum check_ineq, int);
  61 static  int      check_parent(PRE_ARGS, enum mdoct, enum mdoc_type);
  62 static  int      check_stdarg(PRE_ARGS);
  63 static  int      check_text(struct mdoc *, int, int, char *);
  64 static  int      check_argv(struct mdoc *,
  65                         struct mdoc_node *, struct mdoc_argv *);
  66 static  int      check_args(struct mdoc *, struct mdoc_node *);
  67
  68 static  int      ebool(POST_ARGS);
  69 static  int      berr_ge1(POST_ARGS);
  70 static  int      bwarn_ge1(POST_ARGS);
  71 static  int      eerr_eq0(POST_ARGS);
  72 static  int      eerr_eq1(POST_ARGS);
  73 static  int      eerr_ge1(POST_ARGS);
  74 static  int      eerr_le1(POST_ARGS);
  75 static  int      ewarn_eq0(POST_ARGS);
  76 static  int      ewarn_ge1(POST_ARGS);
  77 static  int      herr_eq0(POST_ARGS);
  78 static  int      herr_ge1(POST_ARGS);
  79 static  int      hwarn_eq0(POST_ARGS);
  80 static  int      hwarn_eq1(POST_ARGS);
  81 static  int      hwarn_le1(POST_ARGS);
  82
  83 static  int      post_an(POST_ARGS);
  84 static  int      post_at(POST_ARGS);
  85 static  int      post_bf(POST_ARGS);
  86 static  int      post_bl(POST_ARGS);
  87 static  int      post_bl_head(POST_ARGS);
  88 static  int      post_defaults(POST_ARGS);
  89 static  int      post_eoln(POST_ARGS);
  90 static  int      post_dt(POST_ARGS);
  91 static  int      post_it(POST_ARGS);
  92 static  int      post_lb(POST_ARGS);
  93 static  int      post_nm(POST_ARGS);
  94 static  int      post_root(POST_ARGS);
  95 static  int      post_rs(POST_ARGS);
  96 static  int      post_sh(POST_ARGS);
  97 static  int      post_sh_body(POST_ARGS);
  98 static  int      post_sh_head(POST_ARGS);
  99 static  int      post_st(POST_ARGS);
 100 static  int      post_vt(POST_ARGS);
 101 static  int      pre_an(PRE_ARGS);
 102 static  int      pre_bd(PRE_ARGS);
 103 static  int      pre_bl(PRE_ARGS);
 104 static  int      pre_dd(PRE_ARGS);
 105 static  int      pre_display(PRE_ARGS);
 106 static  int      pre_dt(PRE_ARGS);
 107 static  int      pre_it(PRE_ARGS);
 108 static  int      pre_os(PRE_ARGS);
 109 static  int      pre_par(PRE_ARGS);
 110 static  int      pre_rv(PRE_ARGS);
 111 static  int      pre_sh(PRE_ARGS);
 112 static  int      pre_ss(PRE_ARGS);
 113
 114 static  v_post   posts_an[] = { post_an, NULL };
 115 static  v_post   posts_at[] = { post_at, NULL };
 116 static  v_post   posts_bd_bk[] = { hwarn_eq0, bwarn_ge1, NULL };
 117 static  v_post   posts_bf[] = { hwarn_le1, post_bf, NULL };
 118 static  v_post   posts_bl[] = { bwarn_ge1, post_bl, NULL };
 119 static  v_post   posts_bool[] = { eerr_eq1, ebool, NULL };
 120 static  v_post   posts_eoln[] = { post_eoln, NULL };
 121 static  v_post   posts_defaults[] = { post_defaults, NULL };
 122 static  v_post   posts_dt[] = { post_dt, NULL };
 123 static  v_post   posts_fo[] = { hwarn_eq1, bwarn_ge1, NULL };
 124 static  v_post   posts_it[] = { post_it, NULL };
 125 static  v_post   posts_lb[] = { eerr_eq1, post_lb, NULL };
 126 static  v_post   posts_nd[] = { berr_ge1, NULL };
 127 static  v_post   posts_nm[] = { post_nm, NULL };
 128 static  v_post   posts_notext[] = { ewarn_eq0, NULL };
 129 static  v_post   posts_rs[] = { berr_ge1, herr_eq0, post_rs, NULL };
 130 static  v_post   posts_sh[] = { herr_ge1, bwarn_ge1, post_sh, NULL };
 131 static  v_post   posts_sp[] = { eerr_le1, NULL };
 132 static  v_post   posts_ss[] = { herr_ge1, NULL };
 133 static  v_post   posts_st[] = { eerr_eq1, post_st, NULL };
 134 static  v_post   posts_text[] = { eerr_ge1, NULL };
 135 static  v_post   posts_text1[] = { eerr_eq1, NULL };
 136 static  v_post   posts_vt[] = { post_vt, NULL };
 137 static  v_post   posts_wline[] = { bwarn_ge1, herr_eq0, NULL };
 138 static  v_post   posts_wtext[] = { ewarn_ge1, NULL };
 139 static  v_pre    pres_an[] = { pre_an, NULL };
 140 static  v_pre    pres_bd[] = { pre_display, pre_bd, pre_par, NULL };
 141 static  v_pre    pres_bl[] = { pre_bl, pre_par, NULL };
 142 static  v_pre    pres_d1[] = { pre_display, NULL };
 143 static  v_pre    pres_dd[] = { pre_dd, NULL };
 144 static  v_pre    pres_dt[] = { pre_dt, NULL };
 145 static  v_pre    pres_er[] = { NULL, NULL };
 146 static  v_pre    pres_ex[] = { NULL, NULL };
 147 static  v_pre    pres_fd[] = { NULL, NULL };
 148 static  v_pre    pres_it[] = { pre_it, NULL };
 149 static  v_pre    pres_os[] = { pre_os, NULL };
 150 static  v_pre    pres_pp[] = { pre_par, NULL };
 151 static  v_pre    pres_rv[] = { pre_rv, NULL };
 152 static  v_pre    pres_sh[] = { pre_sh, NULL };
 153 static  v_pre    pres_ss[] = { pre_ss, NULL };
 154
 155 const   struct valids mdoc_valids[MDOC_MAX] = {
 156         { NULL, NULL },                         /* Ap */
 157         { pres_dd, posts_wtext },               /* Dd */
 158         { pres_dt, posts_dt },                  /* Dt */
 159         { pres_os, NULL },                      /* Os */
 160         { pres_sh, posts_sh },                  /* Sh */
 161         { pres_ss, posts_ss },                  /* Ss */
 162         { pres_pp, posts_notext },              /* Pp */
 163         { pres_d1, posts_wline },               /* D1 */
 164         { pres_d1, posts_wline },               /* Dl */
 165         { pres_bd, posts_bd_bk },               /* Bd */
 166         { NULL, NULL },                         /* Ed */
 167         { pres_bl, posts_bl },                  /* Bl */
 168         { NULL, NULL },                         /* El */
 169         { pres_it, posts_it },                  /* It */
 170         { NULL, posts_text },                   /* Ad */
 171         { pres_an, posts_an },                  /* An */
 172         { NULL, posts_defaults },               /* Ar */
 173         { NULL, posts_text },                   /* Cd */
 174         { NULL, NULL },                         /* Cm */
 175         { NULL, NULL },                         /* Dv */
 176         { pres_er, posts_text },                /* Er */
 177         { NULL, NULL },                         /* Ev */
 178         { pres_ex, NULL },                      /* Ex */
 179         { NULL, NULL },                         /* Fa */
 180         { pres_fd, posts_wtext },               /* Fd */
 181         { NULL, NULL },                         /* Fl */
 182         { NULL, posts_text },                   /* Fn */
 183         { NULL, posts_wtext },                  /* Ft */
 184         { NULL, posts_text },                   /* Ic */
 185         { NULL, posts_text1 },                  /* In */
 186         { NULL, posts_defaults },               /* Li */
 187         { NULL, posts_nd },                     /* Nd */
 188         { NULL, posts_nm },                     /* Nm */
 189         { NULL, posts_wline },                  /* Op */
 190         { NULL, NULL },                         /* Ot */
 191         { NULL, NULL },                         /* Pa */
 192         { pres_rv, NULL },                      /* Rv */
 193         { NULL, posts_st },                     /* St */
 194         { NULL, NULL },                         /* Va */
 195         { NULL, posts_vt },                     /* Vt */
 196         { NULL, posts_wtext },                  /* Xr */
 197         { NULL, posts_text },                   /* %A */
 198         { NULL, posts_text },                   /* %B */ /* FIXME: can be used outside Rs/Re. */
 199         { NULL, posts_text },                   /* %D */ /* FIXME: check date with mandoc_a2time(). */
 200         { NULL, posts_text },                   /* %I */
 201         { NULL, posts_text },                   /* %J */
 202         { NULL, posts_text },                   /* %N */
 203         { NULL, posts_text },                   /* %O */
 204         { NULL, posts_text },                   /* %P */
 205         { NULL, posts_text },                   /* %R */
 206         { NULL, posts_text },                   /* %T */ /* FIXME: can be used outside Rs/Re. */
 207         { NULL, posts_text },                   /* %V */
 208         { NULL, NULL },                         /* Ac */
 209         { NULL, NULL },                         /* Ao */
 210         { NULL, posts_wline },                  /* Aq */
 211         { NULL, posts_at },                     /* At */
 212         { NULL, NULL },                         /* Bc */
 213         { NULL, posts_bf },                     /* Bf */
 214         { NULL, NULL },                         /* Bo */
 215         { NULL, posts_wline },                  /* Bq */
 216         { NULL, NULL },                         /* Bsx */
 217         { NULL, NULL },                         /* Bx */
 218         { NULL, posts_bool },                   /* Db */
 219         { NULL, NULL },                         /* Dc */
 220         { NULL, NULL },                         /* Do */
 221         { NULL, posts_wline },                  /* Dq */
 222         { NULL, NULL },                         /* Ec */
 223         { NULL, NULL },                         /* Ef */
 224         { NULL, NULL },                         /* Em */
 225         { NULL, NULL },                         /* Eo */
 226         { NULL, NULL },                         /* Fx */
 227         { NULL, posts_text },                   /* Ms */
 228         { NULL, posts_notext },                 /* No */
 229         { NULL, posts_notext },                 /* Ns */
 230         { NULL, NULL },                         /* Nx */
 231         { NULL, NULL },                         /* Ox */
 232         { NULL, NULL },                         /* Pc */
 233         { NULL, posts_text1 },                  /* Pf */
 234         { NULL, NULL },                         /* Po */
 235         { NULL, posts_wline },                  /* Pq */
 236         { NULL, NULL },                         /* Qc */
 237         { NULL, posts_wline },                  /* Ql */
 238         { NULL, NULL },                         /* Qo */
 239         { NULL, posts_wline },                  /* Qq */
 240         { NULL, NULL },                         /* Re */
 241         { NULL, posts_rs },                     /* Rs */
 242         { NULL, NULL },                         /* Sc */
 243         { NULL, NULL },                         /* So */
 244         { NULL, posts_wline },                  /* Sq */
 245         { NULL, posts_bool },                   /* Sm */
 246         { NULL, posts_text },                   /* Sx */
 247         { NULL, posts_text },                   /* Sy */
 248         { NULL, posts_text },                   /* Tn */
 249         { NULL, NULL },                         /* Ux */
 250         { NULL, NULL },                         /* Xc */
 251         { NULL, NULL },                         /* Xo */
 252         { NULL, posts_fo },                     /* Fo */
 253         { NULL, NULL },                         /* Fc */
 254         { NULL, NULL },                         /* Oo */
 255         { NULL, NULL },                         /* Oc */
 256         { NULL, posts_bd_bk },                  /* Bk */
 257         { NULL, NULL },                         /* Ek */
 258         { NULL, posts_eoln },                   /* Bt */
 259         { NULL, NULL },                         /* Hf */
 260         { NULL, NULL },                         /* Fr */
 261         { NULL, posts_eoln },                   /* Ud */
 262         { NULL, posts_lb },                     /* Lb */
 263         { NULL, posts_notext },                 /* Lp */
 264         { NULL, posts_text },                   /* Lk */
 265         { NULL, posts_defaults },               /* Mt */
 266         { NULL, posts_wline },                  /* Brq */
 267         { NULL, NULL },                         /* Bro */
 268         { NULL, NULL },                         /* Brc */
 269         { NULL, posts_text },                   /* %C */
 270         { NULL, NULL },                         /* Es */
 271         { NULL, NULL },                         /* En */
 272         { NULL, NULL },                         /* Dx */
 273         { NULL, posts_text },                   /* %Q */
 274         { NULL, posts_notext },                 /* br */
 275         { pres_pp, posts_sp },                  /* sp */
 276         { NULL, posts_text1 },                  /* %U */
 277         { NULL, NULL },                         /* Ta */
 278 };
 279
 280 #define RSORD_MAX 14 /* Number of `Rs' blocks. */
 281
 282 static  const enum mdoct rsord[RSORD_MAX] = {
 283         MDOC__A,
 284         MDOC__T,
 285         MDOC__B,
 286         MDOC__I,
 287         MDOC__J,
 288         MDOC__R,
 289         MDOC__N,
 290         MDOC__V,
 291         MDOC__P,
 292         MDOC__Q,
 293         MDOC__D,
 294         MDOC__O,
 295         MDOC__C,
 296         MDOC__U
 297 };
 298
 299
 300 int
 301 mdoc_valid_pre(struct mdoc *mdoc, struct mdoc_node *n)
 302 {
 303         v_pre           *p;
 304         int              line, pos;
 305         char            *tp;
 306
 307         if (MDOC_TEXT == n->type) {
 308                 tp = n->string;
 309                 line = n->line;
 310                 pos = n->pos;
 311                 return(check_text(mdoc, line, pos, tp));
 312         }
 313
 314         if ( ! check_args(mdoc, n))
 315                 return(0);
 316         if (NULL == mdoc_valids[n->tok].pre)
 317                 return(1);
 318         for (p = mdoc_valids[n->tok].pre; *p; p++)
 319                 if ( ! (*p)(mdoc, n))
 320                         return(0);
 321         return(1);
 322 }
 323
 324
 325 int
 326 mdoc_valid_post(struct mdoc *mdoc)
 327 {
 328         v_post          *p;
 329
 330         if (MDOC_VALID & mdoc->last->flags)
 331                 return(1);
 332         mdoc->last->flags |= MDOC_VALID;
 333
 334         if (MDOC_TEXT == mdoc->last->type)
 335                 return(1);
 336         if (MDOC_ROOT == mdoc->last->type)
 337                 return(post_root(mdoc));
 338
 339         if (NULL == mdoc_valids[mdoc->last->tok].post)
 340                 return(1);
 341         for (p = mdoc_valids[mdoc->last->tok].post; *p; p++)
 342                 if ( ! (*p)(mdoc))
 343                         return(0);
 344
 345         return(1);
 346 }
 347
 348 static int
 349 check_count(struct mdoc *m, enum mdoc_type type,
 350                 enum check_lvl lvl, enum check_ineq ineq, int val)
 351 {
 352         const char      *p;
 353
 354         if (m->last->type != type)
 355                 return(1);
 356
 357         switch (ineq) {
 358         case (CHECK_LT):
 359                 p = "less than ";
 360                 if (m->last->nchild < val)
 361                         return(1);
 362                 break;
 363         case (CHECK_GT):
 364                 p = "greater than ";
 365                 if (m->last->nchild > val)
 366                         return(1);
 367                 break;
 368         case (CHECK_EQ):
 369                 p = "";
 370                 if (val == m->last->nchild)
 371                         return(1);
 372                 break;
 373         }
 374
 375         if (CHECK_WARN == lvl) {
 376                 return(mdoc_vmsg(m, MANDOCERR_ARGCOUNT,
 377                                 m->last->line, m->last->pos,
 378                                 "want %s%d children (have %d)",
 379                                 p, val, m->last->nchild));
 380         }
 381
 382         return(mdoc_vmsg(m, MANDOCERR_ARGCOUNT,
 383                         m->last->line, m->last->pos,
 384                         "require %s%d children (have %d)",
 385                         p, val, m->last->nchild));
 386 }
 387
 388 static int
 389 berr_ge1(POST_ARGS)
 390 {
 391
 392         return(check_count(mdoc, MDOC_BODY, CHECK_FATAL, CHECK_GT, 0));
 393 }
 394
 395 static int
 396 bwarn_ge1(POST_ARGS)
 397 {
 398         return(check_count(mdoc, MDOC_BODY, CHECK_WARN, CHECK_GT, 0));
 399 }
 400
 401 static int
 402 eerr_eq0(POST_ARGS)
 403 {
 404         return(check_count(mdoc, MDOC_ELEM, CHECK_FATAL, CHECK_EQ, 0));
 405 }
 406
 407 static int
 408 eerr_eq1(POST_ARGS)
 409 {
 410         return(check_count(mdoc, MDOC_ELEM, CHECK_FATAL, CHECK_EQ, 1));
 411 }
 412
 413 static int
 414 eerr_ge1(POST_ARGS)
 415 {
 416         return(check_count(mdoc, MDOC_ELEM, CHECK_FATAL, CHECK_GT, 0));
 417 }
 418
 419 static int
 420 eerr_le1(POST_ARGS)
 421 {
 422         return(check_count(mdoc, MDOC_ELEM, CHECK_FATAL, CHECK_LT, 2));
 423 }
 424
 425 static int
 426 ewarn_eq0(POST_ARGS)
 427 {
 428         return(check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_EQ, 0));
 429 }
 430
 431 static int
 432 ewarn_ge1(POST_ARGS)
 433 {
 434         return(check_count(mdoc, MDOC_ELEM, CHECK_WARN, CHECK_GT, 0));
 435 }
 436
 437 static int
 438 herr_eq0(POST_ARGS)
 439 {
 440         return(check_count(mdoc, MDOC_HEAD, CHECK_FATAL, CHECK_EQ, 0));
 441 }
 442
 443 static int
 444 herr_ge1(POST_ARGS)
 445 {
 446         return(check_count(mdoc, MDOC_HEAD, CHECK_FATAL, CHECK_GT, 0));
 447 }
 448
 449 static int
 450 hwarn_eq0(POST_ARGS)
 451 {
 452         return(check_count(mdoc, MDOC_HEAD, CHECK_WARN, CHECK_EQ, 0));
 453 }
 454
 455 static int
 456 hwarn_eq1(POST_ARGS)
 457 {
 458         return(check_count(mdoc, MDOC_HEAD, CHECK_WARN, CHECK_EQ, 1));
 459 }
 460
 461 static int
 462 hwarn_le1(POST_ARGS)
 463 {
 464         return(check_count(mdoc, MDOC_HEAD, CHECK_WARN, CHECK_LT, 2));
 465 }
 466
 467
 468 static int
 469 check_stdarg(PRE_ARGS)
 470 {
 471
 472         if (n->args && 1 == n->args->argc)
 473                 if (MDOC_Std == n->args->argv[0].arg)
 474                         return(1);
 475         return(mdoc_nmsg(mdoc, n, MANDOCERR_NOARGV));
 476 }
 477
 478
 479 static int
 480 check_args(struct mdoc *m, struct mdoc_node *n)
 481 {
 482         int              i;
 483
 484         if (NULL == n->args)
 485                 return(1);
 486
 487         assert(n->args->argc);
 488         for (i = 0; i < (int)n->args->argc; i++)
 489                 if ( ! check_argv(m, n, &n->args->argv[i]))
 490                         return(0);
 491
 492         return(1);
 493 }
 494
 495
 496 static int
 497 check_argv(struct mdoc *m, struct mdoc_node *n, struct mdoc_argv *v)
 498 {
 499         int              i;
 500
 501         for (i = 0; i < (int)v->sz; i++)
 502                 if ( ! check_text(m, v->line, v->pos, v->value[i]))
 503                         return(0);
 504
 505         if (MDOC_Std == v->arg) {
 506                 if (v->sz || m->meta.name)
 507                         return(1);
 508                 if ( ! mdoc_nmsg(m, n, MANDOCERR_NONAME))
 509                         return(0);
 510         }
 511
 512         return(1);
 513 }
 514
 515
 516 static int
 517 check_text(struct mdoc *m, int ln, int pos, char *p)
 518 {
 519         int              c;
 520         size_t           sz;
 521
 522         for ( ; *p; p++, pos++) {
 523                 sz = strcspn(p, "\t\\");
 524                 p += (int)sz;
 525
 526                 if ('\0' == *p)
 527                         break;
 528
 529                 pos += (int)sz;
 530
 531                 if ('\t' == *p) {
 532                         if (MDOC_LITERAL & m->flags)
 533                                 continue;
 534                         if (mdoc_pmsg(m, ln, pos, MANDOCERR_BADTAB))
 535                                 continue;
 536                         return(0);
 537                 }
 538
 539                 /* Check the special character. */
 540
 541                 c = mandoc_special(p);
 542                 if (c) {
 543                         p += c - 1;
 544                         pos += c - 1;
 545                 } else
 546                         mdoc_pmsg(m, ln, pos, MANDOCERR_BADESCAPE);
 547         }
 548
 549         return(1);
 550 }
 551
 552
 553 static int
 554 check_parent(PRE_ARGS, enum mdoct tok, enum mdoc_type t)
 555 {
 556
 557         assert(n->parent);
 558         if ((MDOC_ROOT == t || tok == n->parent->tok) &&
 559                         (t == n->parent->type))
 560                 return(1);
 561
 562         mdoc_vmsg(mdoc, MANDOCERR_SYNTCHILD,
 563                                 n->line, n->pos, "want parent %s",
 564                                 MDOC_ROOT == t ? "<root>" :
 565                                         mdoc_macronames[tok]);
 566         return(0);
 567 }
 568
 569
 570 static int
 571 pre_display(PRE_ARGS)
 572 {
 573         struct mdoc_node *node;
 574
 575         /* Display elements (`Bd', `D1'...) cannot be nested. */
 576
 577         if (MDOC_BLOCK != n->type)
 578                 return(1);
 579
 580         /* LINTED */
 581         for (node = mdoc->last->parent; node; node = node->parent)
 582                 if (MDOC_BLOCK == node->type)
 583                         if (MDOC_Bd == node->tok)
 584                                 break;
 585         if (NULL == node)
 586                 return(1);
 587
 588         mdoc_nmsg(mdoc, n, MANDOCERR_NESTEDDISP);
 589         return(0);
 590 }
 591
 592
 593 static int
 594 pre_bl(PRE_ARGS)
 595 {
 596         int               i, comp, dup;
 597         const char       *offs, *width;
 598         enum mdoc_list    lt;
 599         struct mdoc_node *np;
 600
 601         if (MDOC_BLOCK != n->type) {
 602                 if (ENDBODY_NOT != n->end) {
 603                         assert(n->pending);
 604                         np = n->pending->parent;
 605                 } else
 606                         np = n->parent;
 607
 608                 assert(np);
 609                 assert(MDOC_BLOCK == np->type);
 610                 assert(MDOC_Bl == np->tok);
 611                 assert(np->data.Bl);
 612                 n->data.Bl = np->data.Bl;
 613                 return(1);
 614         }
 615
 616         /*
 617          * First figure out which kind of list to use: bind ourselves to
 618          * the first mentioned list type and warn about any remaining
 619          * ones.  If we find no list type, we default to LIST_item.
 620          */
 621
 622         assert(NULL == n->data.Bl);
 623         n->data.Bl = mandoc_calloc(1, sizeof(struct mdoc_bl));
 624
 625         /* LINTED */
 626         for (i = 0; n->args && i < (int)n->args->argc; i++) {
 627                 lt = LIST__NONE;
 628                 dup = comp = 0;
 629                 width = offs = NULL;
 630                 switch (n->args->argv[i].arg) {
 631                 /* Set list types. */
 632                 case (MDOC_Bullet):
 633                         lt = LIST_bullet;
 634                         break;
 635                 case (MDOC_Dash):
 636                         lt = LIST_dash;
 637                         break;
 638                 case (MDOC_Enum):
 639                         lt = LIST_enum;
 640                         break;
 641                 case (MDOC_Hyphen):
 642                         lt = LIST_hyphen;
 643                         break;
 644                 case (MDOC_Item):
 645                         lt = LIST_item;
 646                         break;
 647                 case (MDOC_Tag):
 648                         lt = LIST_tag;
 649                         break;
 650                 case (MDOC_Diag):
 651                         lt = LIST_diag;
 652                         break;
 653                 case (MDOC_Hang):
 654                         lt = LIST_hang;
 655                         break;
 656                 case (MDOC_Ohang):
 657                         lt = LIST_ohang;
 658                         break;
 659                 case (MDOC_Inset):
 660                         lt = LIST_inset;
 661                         break;
 662                 case (MDOC_Column):
 663                         lt = LIST_column;
 664                         break;
 665                 /* Set list arguments. */
 666                 case (MDOC_Compact):
 667                         dup = n->data.Bl->comp;
 668                         comp = 1;
 669                         break;
 670                 case (MDOC_Width):
 671                         dup = (NULL != n->data.Bl->width);
 672                         width = n->args->argv[i].value[0];
 673                         break;
 674                 case (MDOC_Offset):
 675                         /* NB: this can be empty! */
 676                         if (n->args->argv[i].sz) {
 677                                 offs = n->args->argv[i].value[0];
 678                                 dup = (NULL != n->data.Bl->offs);
 679                                 break;
 680                         }
 681                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_IGNARGV))
 682                                 return(0);
 683                         break;
 684                 default:
 685                         continue;
 686                 }
 687
 688                 /* Check: duplicate auxiliary arguments. */
 689
 690                 if (dup && ! mdoc_nmsg(mdoc, n, MANDOCERR_ARGVREP))
 691                         return(0);
 692
 693                 if (comp && ! dup)
 694                         n->data.Bl->comp = comp;
 695                 if (offs && ! dup)
 696                         n->data.Bl->offs = offs;
 697                 if (width && ! dup)
 698                         n->data.Bl->width = width;
 699
 700                 /* Check: multiple list types. */
 701
 702                 if (LIST__NONE != lt && n->data.Bl->type != LIST__NONE)
 703                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTREP))
 704                                 return(0);
 705
 706                 /* Assign list type. */
 707
 708                 if (LIST__NONE != lt && n->data.Bl->type == LIST__NONE) {
 709                         n->data.Bl->type = lt;
 710                         /* Set column information, too. */
 711                         if (LIST_column == lt) {
 712                                 n->data.Bl->ncols =
 713                                         n->args->argv[i].sz;
 714                                 n->data.Bl->cols = (const char **)
 715                                         n->args->argv[i].value;
 716                         }
 717                 }
 718
 719                 /* The list type should come first. */
 720
 721                 if (n->data.Bl->type == LIST__NONE)
 722                         if (n->data.Bl->width ||
 723                                         n->data.Bl->offs ||
 724                                         n->data.Bl->comp)
 725                                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTFIRST))
 726                                         return(0);
 727
 728                 continue;
 729         }
 730
 731         /* Allow lists to default to LIST_item. */
 732
 733         if (LIST__NONE == n->data.Bl->type) {
 734                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_LISTTYPE))
 735                         return(0);
 736                 n->data.Bl->type = LIST_item;
 737         }
 738
 739         /*
 740          * Validate the width field.  Some list types don't need width
 741          * types and should be warned about them.  Others should have it
 742          * and must also be warned.
 743          */
 744
 745         switch (n->data.Bl->type) {
 746         case (LIST_tag):
 747                 if (n->data.Bl->width)
 748                         break;
 749                 if (mdoc_nmsg(mdoc, n, MANDOCERR_NOWIDTHARG))
 750                         break;
 751                 return(0);
 752         case (LIST_column):
 753                 /* FALLTHROUGH */
 754         case (LIST_diag):
 755                 /* FALLTHROUGH */
 756         case (LIST_ohang):
 757                 /* FALLTHROUGH */
 758         case (LIST_inset):
 759                 /* FALLTHROUGH */
 760         case (LIST_item):
 761                 if (NULL == n->data.Bl->width)
 762                         break;
 763                 if (mdoc_nmsg(mdoc, n, MANDOCERR_WIDTHARG))
 764                         break;
 765                 return(0);
 766         default:
 767                 break;
 768         }
 769
 770         return(1);
 771 }
 772
 773
 774 static int
 775 pre_bd(PRE_ARGS)
 776 {
 777         int               i, dup, comp;
 778         enum mdoc_disp    dt;
 779         const char       *offs;
 780         struct mdoc_node *np;
 781
 782         if (MDOC_BLOCK != n->type) {
 783                 if (ENDBODY_NOT != n->end) {
 784                         assert(n->pending);
 785                         np = n->pending->parent;
 786                 } else
 787                         np = n->parent;
 788
 789                 assert(np);
 790                 assert(MDOC_BLOCK == np->type);
 791                 assert(MDOC_Bd == np->tok);
 792                 assert(np->data.Bd);
 793                 n->data.Bd = np->data.Bd;
 794                 return(1);
 795         }
 796
 797         assert(NULL == n->data.Bd);
 798         n->data.Bd = mandoc_calloc(1, sizeof(struct mdoc_bd));
 799
 800         /* LINTED */
 801         for (i = 0; n->args && i < (int)n->args->argc; i++) {
 802                 dt = DISP__NONE;
 803                 dup = comp = 0;
 804                 offs = NULL;
 805
 806                 switch (n->args->argv[i].arg) {
 807                 case (MDOC_Centred):
 808                         dt = DISP_centred;
 809                         break;
 810                 case (MDOC_Ragged):
 811                         dt = DISP_ragged;
 812                         break;
 813                 case (MDOC_Unfilled):
 814                         dt = DISP_unfilled;
 815                         break;
 816                 case (MDOC_Filled):
 817                         dt = DISP_filled;
 818                         break;
 819                 case (MDOC_Literal):
 820                         dt = DISP_literal;
 821                         break;
 822                 case (MDOC_File):
 823                         mdoc_nmsg(mdoc, n, MANDOCERR_BADDISP);
 824                         return(0);
 825                 case (MDOC_Offset):
 826                         /* NB: this can be empty! */
 827                         if (n->args->argv[i].sz) {
 828                                 offs = n->args->argv[i].value[0];
 829                                 dup = (NULL != n->data.Bd->offs);
 830                                 break;
 831                         }
 832                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_IGNARGV))
 833                                 return(0);
 834                         break;
 835                 case (MDOC_Compact):
 836                         comp = 1;
 837                         dup = n->data.Bd->comp;
 838                         break;
 839                 default:
 840                         abort();
 841                         /* NOTREACHED */
 842                 }
 843
 844                 /* Check whether we have duplicates. */
 845
 846                 if (dup && ! mdoc_nmsg(mdoc, n, MANDOCERR_ARGVREP))
 847                         return(0);
 848
 849                 /* Make our auxiliary assignments. */
 850
 851                 if (offs && ! dup)
 852                         n->data.Bd->offs = offs;
 853                 if (comp && ! dup)
 854                         n->data.Bd->comp = comp;
 855
 856                 /* Check whether a type has already been assigned. */
 857
 858                 if (DISP__NONE != dt && n->data.Bd->type != DISP__NONE)
 859                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_DISPREP))
 860                                 return(0);
 861
 862                 /* Make our type assignment. */
 863
 864                 if (DISP__NONE != dt && n->data.Bd->type == DISP__NONE)
 865                         n->data.Bd->type = dt;
 866         }
 867
 868         if (DISP__NONE == n->data.Bd->type) {
 869                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_DISPTYPE))
 870                         return(0);
 871                 n->data.Bd->type = DISP_ragged;
 872         }
 873
 874         return(1);
 875 }
 876
 877
 878 static int
 879 pre_ss(PRE_ARGS)
 880 {
 881
 882         if (MDOC_BLOCK != n->type)
 883                 return(1);
 884         return(check_parent(mdoc, n, MDOC_Sh, MDOC_BODY));
 885 }
 886
 887
 888 static int
 889 pre_sh(PRE_ARGS)
 890 {
 891
 892         if (MDOC_BLOCK != n->type)
 893                 return(1);
 894
 895         mdoc->regs->regs[(int)REG_nS].set = 0;
 896         return(check_parent(mdoc, n, MDOC_MAX, MDOC_ROOT));
 897 }
 898
 899
 900 static int
 901 pre_it(PRE_ARGS)
 902 {
 903
 904         if (MDOC_BLOCK != n->type)
 905                 return(1);
 906         /*
 907          * FIXME: this can probably be lifted if we make the It into
 908          * something else on-the-fly?
 909          */
 910         return(check_parent(mdoc, n, MDOC_Bl, MDOC_BODY));
 911 }
 912
 913
 914 static int
 915 pre_an(PRE_ARGS)
 916 {
 917         int              i;
 918
 919         if (NULL == n->args)
 920                 return(1);
 921
 922         for (i = 1; i < (int)n->args->argc; i++)
 923                 if ( ! mdoc_pmsg(mdoc, n->args->argv[i].line,
 924                         n->args->argv[i].pos, MANDOCERR_IGNARGV))
 925                         return(0);
 926
 927         if (MDOC_Split == n->args->argv[0].arg)
 928                 n->data.An.auth = AUTH_split;
 929         else if (MDOC_Nosplit == n->args->argv[0].arg)
 930                 n->data.An.auth = AUTH_nosplit;
 931         else
 932                 abort();
 933
 934         return(1);
 935 }
 936
 937
 938 static int
 939 pre_rv(PRE_ARGS)
 940 {
 941
 942         return(check_stdarg(mdoc, n));
 943 }
 944
 945
 946 static int
 947 post_dt(POST_ARGS)
 948 {
 949         const struct mdoc_node *nn;
 950         const char      *p;
 951
 952         if (NULL != (nn = mdoc->last->child))
 953                 for (p = nn->string; *p; p++) {
 954                         if (toupper((u_char)*p) == *p)
 955                                 continue;
 956                         if ( ! mdoc_nmsg(mdoc, nn, MANDOCERR_UPPERCASE))
 957                                 return(0);
 958                         break;
 959                 }
 960
 961         return(1);
 962 }
 963
 964
 965 static int
 966 pre_dt(PRE_ARGS)
 967 {
 968
 969         if (0 == mdoc->meta.date || mdoc->meta.os)
 970                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 971                         return(0);
 972         if (mdoc->meta.title)
 973                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
 974                         return(0);
 975         return(1);
 976 }
 977
 978
 979 static int
 980 pre_os(PRE_ARGS)
 981 {
 982
 983         if (NULL == mdoc->meta.title || 0 == mdoc->meta.date)
 984                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 985                         return(0);
 986         if (mdoc->meta.os)
 987                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
 988                         return(0);
 989         return(1);
 990 }
 991
 992
 993 static int
 994 pre_dd(PRE_ARGS)
 995 {
 996
 997         if (mdoc->meta.title || mdoc->meta.os)
 998                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGOOO))
 999                         return(0);
1000         if (mdoc->meta.date)
1001                 if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_PROLOGREP))
1002                         return(0);
1003         return(1);
1004 }
1005
1006
1007 static int
1008 post_bf(POST_ARGS)
1009 {
1010         struct mdoc_node *np;
1011         enum mdocargt     arg;
1012
1013         /*
1014          * Unlike other data pointers, these are "housed" by the HEAD
1015          * element, which contains the goods.
1016          */
1017
1018         if (MDOC_HEAD != mdoc->last->type) {
1019                 if (ENDBODY_NOT != mdoc->last->end) {
1020                         assert(mdoc->last->pending);
1021                         np = mdoc->last->pending->parent->head;
1022                 } else if (MDOC_BLOCK != mdoc->last->type) {
1023                         np = mdoc->last->parent->head;
1024                 } else
1025                         np = mdoc->last->head;
1026
1027                 assert(np);
1028                 assert(MDOC_HEAD == np->type);
1029                 assert(MDOC_Bf == np->tok);
1030                 assert(np->data.Bf);
1031                 mdoc->last->data.Bf = np->data.Bf;
1032                 return(1);
1033         }
1034
1035         np = mdoc->last;
1036         assert(MDOC_BLOCK == np->parent->type);
1037         assert(MDOC_Bf == np->parent->tok);
1038         np->data.Bf = mandoc_calloc(1, sizeof(struct mdoc_bf));
1039
1040         /*
1041          * Cannot have both argument and parameter.
1042          * If neither is specified, let it through with a warning.
1043          */
1044
1045         if (np->parent->args && np->child) {
1046                 mdoc_nmsg(mdoc, np, MANDOCERR_SYNTARGVCOUNT);
1047                 return(0);
1048         } else if (NULL == np->parent->args && NULL == np->child)
1049                 return(mdoc_nmsg(mdoc, np, MANDOCERR_FONTTYPE));
1050
1051         /* Extract argument into data. */
1052
1053         if (np->parent->args) {
1054                 arg = np->parent->args->argv[0].arg;
1055                 if (MDOC_Emphasis == arg)
1056                         np->data.Bf->font = FONT_Em;
1057                 else if (MDOC_Literal == arg)
1058                         np->data.Bf->font = FONT_Li;
1059                 else if (MDOC_Symbolic == arg)
1060                         np->data.Bf->font = FONT_Sy;
1061                 else
1062                         abort();
1063                 return(1);
1064         }
1065
1066         /* Extract parameter into data. */
1067
1068         if (0 == strcmp(np->child->string, "Em"))
1069                 np->data.Bf->font = FONT_Em;
1070         else if (0 == strcmp(np->child->string, "Li"))
1071                 np->data.Bf->font = FONT_Li;
1072         else if (0 == strcmp(np->child->string, "Sy"))
1073                 np->data.Bf->font = FONT_Sy;
1074         else if ( ! mdoc_nmsg(mdoc, np, MANDOCERR_FONTTYPE))
1075                 return(0);
1076
1077         return(1);
1078 }
1079
1080
1081 static int
1082 post_lb(POST_ARGS)
1083 {
1084
1085         if (mdoc_a2lib(mdoc->last->child->string))
1086                 return(1);
1087         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADLIB));
1088 }
1089
1090
1091 static int
1092 post_eoln(POST_ARGS)
1093 {
1094
1095         if (NULL == mdoc->last->child)
1096                 return(1);
1097         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST));
1098 }
1099
1100
1101 static int
1102 post_vt(POST_ARGS)
1103 {
1104         const struct mdoc_node *n;
1105
1106         /*
1107          * The Vt macro comes in both ELEM and BLOCK form, both of which
1108          * have different syntaxes (yet more context-sensitive
1109          * behaviour).  ELEM types must have a child; BLOCK types,
1110          * specifically the BODY, should only have TEXT children.
1111          */
1112
1113         if (MDOC_ELEM == mdoc->last->type)
1114                 return(eerr_ge1(mdoc));
1115         if (MDOC_BODY != mdoc->last->type)
1116                 return(1);
1117
1118         for (n = mdoc->last->child; n; n = n->next)
1119                 if (MDOC_TEXT != n->type)
1120                         if ( ! mdoc_nmsg(mdoc, n, MANDOCERR_CHILD))
1121                                 return(0);
1122
1123         return(1);
1124 }
1125
1126
1127 static int
1128 post_nm(POST_ARGS)
1129 {
1130
1131         if (mdoc->last->child)
1132                 return(1);
1133         if (mdoc->meta.name)
1134                 return(1);
1135         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NONAME));
1136 }
1137
1138 static int
1139 post_defaults(POST_ARGS)
1140 {
1141         struct mdoc_node *nn;
1142
1143         /*
1144          * The `Ar' defaults to "file ..." if no value is provided as an
1145          * argument; the `Mt' macro uses "~"; the `Li' just gets an
1146          * empty string.
1147          */
1148
1149         if (mdoc->last->child)
1150                 return(1);
1151
1152         nn = mdoc->last;
1153         mdoc->next = MDOC_NEXT_CHILD;
1154
1155         switch (nn->tok) {
1156         case (MDOC_Ar):
1157                 if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, "file"))
1158                         return(0);
1159                 if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, "..."))
1160                         return(0);
1161                 break;
1162         case (MDOC_Li):
1163                 if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, ""))
1164                         return(0);
1165                 break;
1166         case (MDOC_Mt):
1167                 if ( ! mdoc_word_alloc(mdoc, nn->line, nn->pos, "~"))
1168                         return(0);
1169                 break;
1170         default:
1171                 abort();
1172                 /* NOTREACHED */
1173         }
1174
1175         mdoc->last = nn;
1176         return(1);
1177 }
1178
1179 static int
1180 post_at(POST_ARGS)
1181 {
1182
1183         if (NULL == mdoc->last->child)
1184                 return(1);
1185         assert(MDOC_TEXT == mdoc->last->child->type);
1186         if (mdoc_a2att(mdoc->last->child->string))
1187                 return(1);
1188         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADATT));
1189 }
1190
1191
1192 static int
1193 post_an(POST_ARGS)
1194 {
1195         struct mdoc_node *np;
1196
1197         np = mdoc->last;
1198         if (AUTH__NONE != np->data.An.auth && np->child)
1199                 return(eerr_eq0(mdoc));
1200         /*
1201          * FIXME: make this ewarn and make sure that the front-ends
1202          * don't print the arguments.
1203          */
1204         if (AUTH__NONE != np->data.An.auth || np->child)
1205                 return(1);
1206         return(mdoc_nmsg(mdoc, np, MANDOCERR_NOARGS));
1207 }
1208
1209
1210 static int
1211 post_it(POST_ARGS)
1212 {
1213         int               i, cols, rc;
1214         enum mdoc_list    lt;
1215         struct mdoc_node *n, *c;
1216         enum mandocerr    er;
1217
1218         if (MDOC_BLOCK != mdoc->last->type)
1219                 return(1);
1220
1221         n = mdoc->last->parent->parent;
1222         assert(n->data.Bl);
1223         lt = n->data.Bl->type;
1224
1225         if (LIST__NONE == lt) {
1226                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_LISTTYPE);
1227                 return(0);
1228         }
1229
1230         switch (lt) {
1231         case (LIST_tag):
1232                 if (mdoc->last->head->child)
1233                         break;
1234                 /* FIXME: give this a dummy value. */
1235                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS))
1236                         return(0);
1237                 break;
1238         case (LIST_hang):
1239                 /* FALLTHROUGH */
1240         case (LIST_ohang):
1241                 /* FALLTHROUGH */
1242         case (LIST_inset):
1243                 /* FALLTHROUGH */
1244         case (LIST_diag):
1245                 if (NULL == mdoc->last->head->child)
1246                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOARGS))
1247                                 return(0);
1248                 break;
1249         case (LIST_bullet):
1250                 /* FALLTHROUGH */
1251         case (LIST_dash):
1252                 /* FALLTHROUGH */
1253         case (LIST_enum):
1254                 /* FALLTHROUGH */
1255         case (LIST_hyphen):
1256                 if (NULL == mdoc->last->body->child)
1257                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY))
1258                                 return(0);
1259                 /* FALLTHROUGH */
1260         case (LIST_item):
1261                 if (mdoc->last->head->child)
1262                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_ARGSLOST))
1263                                 return(0);
1264                 break;
1265         case (LIST_column):
1266                 cols = (int)n->data.Bl->ncols;
1267
1268                 assert(NULL == mdoc->last->head->child);
1269
1270                 if (NULL == mdoc->last->body->child)
1271                         if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NOBODY))
1272                                 return(0);
1273
1274                 for (i = 0, c = mdoc->last->child; c; c = c->next)
1275                         if (MDOC_BODY == c->type)
1276                                 i++;
1277
1278                 if (i < cols)
1279                         er = MANDOCERR_ARGCOUNT;
1280                 else if (i == cols || i == cols + 1)
1281                         break;
1282                 else
1283                         er = MANDOCERR_SYNTARGCOUNT;
1284
1285                 rc = mdoc_vmsg(mdoc, er,
1286                                 mdoc->last->line, mdoc->last->pos,
1287                                 "columns == %d (have %d)", cols, i);
1288                 return(rc);
1289         default:
1290                 break;
1291         }
1292
1293         return(1);
1294 }
1295
1296
1297 static int
1298 post_bl_head(POST_ARGS)
1299 {
1300         struct mdoc_node *n;
1301
1302         assert(mdoc->last->parent);
1303         n = mdoc->last->parent;
1304
1305         if (LIST_column == n->data.Bl->type) {
1306                 if (n->data.Bl->ncols && mdoc->last->nchild) {
1307                         mdoc_nmsg(mdoc, n, MANDOCERR_COLUMNS);
1308                         return(0);
1309                 }
1310                 return(1);
1311         }
1312
1313         /* FIXME: should be ERROR class. */
1314         return(hwarn_eq0(mdoc));
1315 }
1316
1317
1318 static int
1319 post_bl(POST_ARGS)
1320 {
1321         struct mdoc_node        *n;
1322
1323         if (MDOC_HEAD == mdoc->last->type)
1324                 return(post_bl_head(mdoc));
1325         if (MDOC_BODY != mdoc->last->type)
1326                 return(1);
1327         if (NULL == mdoc->last->child)
1328                 return(1);
1329
1330         /*
1331          * We only allow certain children of `Bl'.  This is usually on
1332          * `It', but apparently `Sm' occurs here and there, so we let
1333          * that one through, too.
1334          */
1335
1336         /* LINTED */
1337         for (n = mdoc->last->child; n; n = n->next) {
1338                 if (MDOC_BLOCK == n->type && MDOC_It == n->tok)
1339                         continue;
1340                 if (MDOC_Sm == n->tok)
1341                         continue;
1342                 mdoc_nmsg(mdoc, n, MANDOCERR_SYNTCHILD);
1343                 return(0);
1344         }
1345
1346         return(1);
1347 }
1348
1349
1350 static int
1351 ebool(struct mdoc *mdoc)
1352 {
1353         struct mdoc_node *n;
1354
1355         /* LINTED */
1356         for (n = mdoc->last->child; n; n = n->next) {
1357                 if (MDOC_TEXT != n->type)
1358                         break;
1359                 if (0 == strcmp(n->string, "on"))
1360                         continue;
1361                 if (0 == strcmp(n->string, "off"))
1362                         continue;
1363                 break;
1364         }
1365
1366         if (NULL == n)
1367                 return(1);
1368         return(mdoc_nmsg(mdoc, n, MANDOCERR_BADBOOL));
1369 }
1370
1371
1372 static int
1373 post_root(POST_ARGS)
1374 {
1375
1376         if (NULL == mdoc->first->child)
1377                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1378         else if ( ! (MDOC_PBODY & mdoc->flags))
1379                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCPROLOG);
1380         else if (MDOC_BLOCK != mdoc->first->child->type)
1381                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1382         else if (MDOC_Sh != mdoc->first->child->tok)
1383                 mdoc_nmsg(mdoc, mdoc->first, MANDOCERR_NODOCBODY);
1384         else
1385                 return(1);
1386
1387         return(0);
1388 }
1389
1390
1391 static int
1392 post_st(POST_ARGS)
1393 {
1394
1395         if (mdoc_a2st(mdoc->last->child->string))
1396                 return(1);
1397         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADSTANDARD));
1398 }
1399
1400
1401 static int
1402 post_rs(POST_ARGS)
1403 {
1404         struct mdoc_node *nn, *next, *prev;
1405         int               i, j;
1406
1407         if (MDOC_BODY != mdoc->last->type)
1408                 return(1);
1409
1410         /*
1411          * Make sure only certain types of nodes are allowed within the
1412          * the `Rs' body.  Delete offending nodes and raise a warning.
1413          * Do this before re-ordering for the sake of clarity.
1414          */
1415
1416         next = NULL;
1417         for (nn = mdoc->last->child; nn; nn = next) {
1418                 for (i = 0; i < RSORD_MAX; i++)
1419                         if (nn->tok == rsord[i])
1420                                 break;
1421
1422                 if (i < RSORD_MAX) {
1423                         next = nn->next;
1424                         continue;
1425                 }
1426
1427                 next = nn->next;
1428                 mdoc_nmsg(mdoc, nn, MANDOCERR_CHILD);
1429                 mdoc_node_delete(mdoc, nn);
1430         }
1431
1432         /*
1433          * The full `Rs' block needs special handling to order the
1434          * sub-elements according to `rsord'.  Pick through each element
1435          * and correctly order it.  This is a insertion sort.
1436          */
1437
1438         next = NULL;
1439         for (nn = mdoc->last->child->next; nn; nn = next) {
1440                 /* Determine order of `nn'. */
1441                 for (i = 0; i < RSORD_MAX; i++)
1442                         if (rsord[i] == nn->tok)
1443                                 break;
1444
1445                 /*
1446                  * Remove `nn' from the chain.  This somewhat
1447                  * repeats mdoc_node_unlink(), but since we're
1448                  * just re-ordering, there's no need for the
1449                  * full unlink process.
1450                  */
1451
1452                 if (NULL != (next = nn->next))
1453                         next->prev = nn->prev;
1454
1455                 if (NULL != (prev = nn->prev))
1456                         prev->next = nn->next;
1457
1458                 nn->prev = nn->next = NULL;
1459
1460                 /*
1461                  * Scan back until we reach a node that's
1462                  * ordered before `nn'.
1463                  */
1464
1465                 for ( ; prev ; prev = prev->prev) {
1466                         /* Determine order of `prev'. */
1467                         for (j = 0; j < RSORD_MAX; j++)
1468                                 if (rsord[j] == prev->tok)
1469                                         break;
1470
1471                         if (j <= i)
1472                                 break;
1473                 }
1474
1475                 /*
1476                  * Set `nn' back into its correct place in front
1477                  * of the `prev' node.
1478                  */
1479
1480                 nn->prev = prev;
1481
1482                 if (prev) {
1483                         if (prev->next)
1484                                 prev->next->prev = nn;
1485                         nn->next = prev->next;
1486                         prev->next = nn;
1487                 } else {
1488                         mdoc->last->child->prev = nn;
1489                         nn->next = mdoc->last->child;
1490                         mdoc->last->child = nn;
1491                 }
1492         }
1493
1494         return(1);
1495 }
1496
1497
1498 static int
1499 post_sh(POST_ARGS)
1500 {
1501
1502         if (MDOC_HEAD == mdoc->last->type)
1503                 return(post_sh_head(mdoc));
1504         if (MDOC_BODY == mdoc->last->type)
1505                 return(post_sh_body(mdoc));
1506
1507         return(1);
1508 }
1509
1510
1511 static int
1512 post_sh_body(POST_ARGS)
1513 {
1514         struct mdoc_node *n;
1515
1516         if (SEC_NAME != mdoc->lastsec)
1517                 return(1);
1518
1519         /*
1520          * Warn if the NAME section doesn't contain the `Nm' and `Nd'
1521          * macros (can have multiple `Nm' and one `Nd').  Note that the
1522          * children of the BODY declaration can also be "text".
1523          */
1524
1525         if (NULL == (n = mdoc->last->child))
1526                 return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC));
1527
1528         for ( ; n && n->next; n = n->next) {
1529                 if (MDOC_ELEM == n->type && MDOC_Nm == n->tok)
1530                         continue;
1531                 if (MDOC_TEXT == n->type)
1532                         continue;
1533                 if ( ! mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC))
1534                         return(0);
1535         }
1536
1537         assert(n);
1538         if (MDOC_BLOCK == n->type && MDOC_Nd == n->tok)
1539                 return(1);
1540         return(mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_BADNAMESEC));
1541 }
1542
1543
1544 static int
1545 post_sh_head(POST_ARGS)
1546 {
1547         char              buf[BUFSIZ];
1548         enum mdoc_sec     sec;
1549         struct mdoc_node *n;
1550
1551         /*
1552          * Process a new section.  Sections are either "named" or
1553          * "custom".  Custom sections are user-defined, while named ones
1554          * follow a conventional order and may only appear in certain
1555          * manual sections.
1556          */
1557
1558         buf[0] = '\0';
1559
1560         /* FIXME: use dynamic buffer... */
1561
1562         for (n = mdoc->last->child; n; n = n->next) {
1563                 /* XXX - copied from concat(). */
1564                 assert(MDOC_TEXT == n->type);
1565
1566                 if (strlcat(buf, n->string, BUFSIZ) >= BUFSIZ) {
1567                         mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
1568                         return(0);
1569                 }
1570
1571                 if (NULL == n->next)
1572                         continue;
1573
1574                 if (strlcat(buf, " ", BUFSIZ) >= BUFSIZ) {
1575                         mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
1576                         return(0);
1577                 }
1578         }
1579
1580         sec = mdoc_str2sec(buf);
1581
1582         /* The NAME should be first. */
1583
1584         if (SEC_NAME != sec && SEC_NONE == mdoc->lastnamed)
1585                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_NAMESECFIRST);
1586
1587         /* The SYNOPSIS gets special attention in other areas. */
1588
1589         if (SEC_SYNOPSIS == sec)
1590                 mdoc->flags |= MDOC_SYNOPSIS;
1591         else
1592                 mdoc->flags &= ~MDOC_SYNOPSIS;
1593
1594         /* Mark our last section. */
1595
1596         mdoc->lastsec = sec;
1597
1598         /* We don't care about custom sections after this. */
1599
1600         if (SEC_CUSTOM == sec)
1601                 return(1);
1602
1603         /*
1604          * Check whether our non-custom section is being repeated or is
1605          * out of order.
1606          */
1607
1608         if (sec == mdoc->lastnamed)
1609                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECREP);
1610
1611         if (sec < mdoc->lastnamed)
1612                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECOOO);
1613
1614         /* Mark the last named section. */
1615
1616         mdoc->lastnamed = sec;
1617
1618         /* Check particular section/manual conventions. */
1619
1620         assert(mdoc->meta.msec);
1621
1622         switch (sec) {
1623         case (SEC_RETURN_VALUES):
1624                 /* FALLTHROUGH */
1625         case (SEC_ERRORS):
1626                 /* FALLTHROUGH */
1627         case (SEC_LIBRARY):
1628                 if (*mdoc->meta.msec == '2')
1629                         break;
1630                 if (*mdoc->meta.msec == '3')
1631                         break;
1632                 if (*mdoc->meta.msec == '9')
1633                         break;
1634                 mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_SECMSEC);
1635                 break;
1636         default:
1637                 break;
1638         }
1639
1640         return(1);
1641 }
1642
1643 static int
1644 pre_par(PRE_ARGS)
1645 {
1646
1647         if (NULL == mdoc->last)
1648                 return(1);
1649
1650         /*
1651          * Don't allow prior `Lp' or `Pp' prior to a paragraph-type
1652          * block:  `Lp', `Pp', or non-compact `Bd' or `Bl'.
1653          */
1654
1655         if (MDOC_Pp != mdoc->last->tok && MDOC_Lp != mdoc->last->tok)
1656                 return(1);
1657
1658         if (MDOC_Bl == n->tok && n->data.Bl->comp)
1659                 return(1);
1660         if (MDOC_Bd == n->tok && n->data.Bd->comp)
1661                 return(1);
1662
1663         mdoc_nmsg(mdoc, mdoc->last, MANDOCERR_IGNPAR);
1664         mdoc_node_delete(mdoc, mdoc->last);
1665         return(1);
1666 }