validate.c

   1 /* $Id: validate.c,v 1.63 2009/02/27 09:39:40 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008 Kristaps Dzonsons <kristaps@kth.se>
   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
   7  * above copyright notice and this permission notice appear in all
   8  * copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  11  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  12  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  13  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  16  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <stdlib.h>
  22
  23 #include "private.h"
  24
  25 /*
  26  * Pre- and post-validate macros as they're parsed.  Pre-validation
  27  * occurs when the macro has been detected and its arguments parsed.
  28  * Post-validation occurs when all child macros have also been parsed.
  29  * In the ELEMENT case, this is simply the parameters of the macro; in
  30  * the BLOCK case, this is the HEAD, BODY, TAIL and so on.
  31  */
  32
  33 #define PRE_ARGS        struct mdoc *mdoc, const struct mdoc_node *n
  34 #define POST_ARGS       struct mdoc *mdoc
  35
  36 typedef int     (*v_pre)(PRE_ARGS);
  37 typedef int     (*v_post)(POST_ARGS);
  38
  39 /* FIXME: some sections should only occur in specific msecs. */
  40 /* FIXME: ignoring Pp. */
  41 /* FIXME: math symbols. */
  42
  43 struct  valids {
  44         v_pre   *pre;
  45         v_post  *post;
  46 };
  47
  48 /* Utility checks. */
  49
  50 static  int     check_parent(PRE_ARGS, int, enum mdoc_type);
  51 static  int     check_msec(PRE_ARGS, int, enum mdoc_msec *);
  52 static  int     check_stdarg(PRE_ARGS);
  53
  54 static  int     check_text(struct mdoc *,
  55                         int, int, const char *);
  56
  57 static  int     err_child_lt(struct mdoc *, const char *, int);
  58 static  int     warn_child_lt(struct mdoc *, const char *, int);
  59 static  int     err_child_gt(struct mdoc *, const char *, int);
  60 static  int     warn_child_gt(struct mdoc *, const char *, int);
  61 static  int     err_child_eq(struct mdoc *, const char *, int);
  62 static  int     warn_child_eq(struct mdoc *, const char *, int);
  63
  64 /* Utility auxiliaries. */
  65
  66 static  inline int count_child(struct mdoc *);
  67 static  inline int warn_count(struct mdoc *, const char *,
  68                         int, const char *, int);
  69 static  inline int err_count(struct mdoc *, const char *,
  70                         int, const char *, int);
  71
  72 /* Specific pre-child-parse routines. */
  73
  74 static  int     pre_display(PRE_ARGS);
  75 static  int     pre_sh(PRE_ARGS);
  76 static  int     pre_ss(PRE_ARGS);
  77 static  int     pre_bd(PRE_ARGS);
  78 static  int     pre_bl(PRE_ARGS);
  79 static  int     pre_it(PRE_ARGS);
  80 static  int     pre_cd(PRE_ARGS);
  81 static  int     pre_er(PRE_ARGS);
  82 static  int     pre_ex(PRE_ARGS);
  83 static  int     pre_rv(PRE_ARGS);
  84 static  int     pre_an(PRE_ARGS);
  85 static  int     pre_st(PRE_ARGS);
  86 static  int     pre_prologue(PRE_ARGS);
  87 static  int     pre_prologue(PRE_ARGS);
  88 static  int     pre_prologue(PRE_ARGS);
  89
  90 /* Specific post-child-parse routines. */
  91
  92 static  int     herr_ge1(POST_ARGS);
  93 static  int     hwarn_le1(POST_ARGS);
  94 static  int     herr_eq0(POST_ARGS);
  95 static  int     eerr_eq0(POST_ARGS);
  96 static  int     eerr_le1(POST_ARGS);
  97 static  int     eerr_le2(POST_ARGS);
  98 static  int     eerr_eq1(POST_ARGS);
  99 static  int     eerr_ge1(POST_ARGS);
 100 static  int     ewarn_eq0(POST_ARGS);
 101 static  int     ewarn_eq1(POST_ARGS);
 102 static  int     bwarn_ge1(POST_ARGS);
 103 static  int     hwarn_eq1(POST_ARGS);
 104 static  int     ewarn_ge1(POST_ARGS);
 105 static  int     ebool(POST_ARGS);
 106
 107 static  int     post_sh(POST_ARGS);
 108 static  int     post_sh_body(POST_ARGS);
 109 static  int     post_sh_head(POST_ARGS);
 110 static  int     post_fd(POST_ARGS);
 111 static  int     post_bl(POST_ARGS);
 112 static  int     post_it(POST_ARGS);
 113 static  int     post_ex(POST_ARGS);
 114 static  int     post_an(POST_ARGS);
 115 static  int     post_at(POST_ARGS);
 116 static  int     post_xr(POST_ARGS);
 117 static  int     post_nm(POST_ARGS);
 118 static  int     post_bf(POST_ARGS);
 119 static  int     post_root(POST_ARGS);
 120
 121 /* Collections of pre-child-parse routines. */
 122
 123 static  v_pre   pres_prologue[] = { pre_prologue, NULL };
 124 static  v_pre   pres_d1[] = { pre_display, NULL };
 125 static  v_pre   pres_bd[] = { pre_display, pre_bd, NULL };
 126 static  v_pre   pres_bl[] = { pre_bl, NULL };
 127 static  v_pre   pres_it[] = { pre_it, NULL };
 128 static  v_pre   pres_ss[] = { pre_ss, NULL };
 129 static  v_pre   pres_sh[] = { pre_sh, NULL };
 130 static  v_pre   pres_cd[] = { pre_cd, NULL };
 131 static  v_pre   pres_er[] = { pre_er, NULL };
 132 static  v_pre   pres_ex[] = { pre_ex, NULL };
 133 static  v_pre   pres_rv[] = { pre_rv, NULL };
 134 static  v_pre   pres_an[] = { pre_an, NULL };
 135 static  v_pre   pres_st[] = { pre_st, NULL };
 136
 137 /* Collections of post-child-parse routines. */
 138
 139 static  v_post  posts_bool[] = { eerr_eq1, ebool, NULL };
 140 static  v_post  posts_bd[] = { herr_eq0, bwarn_ge1, NULL };
 141 static  v_post  posts_text[] = { eerr_ge1, NULL };
 142 static  v_post  posts_wtext[] = { ewarn_ge1, NULL };
 143 static  v_post  posts_notext[] = { eerr_eq0, NULL };
 144 static  v_post  posts_wline[] = { bwarn_ge1, herr_eq0, NULL };
 145 static  v_post  posts_sh[] = { herr_ge1, bwarn_ge1, post_sh, NULL };
 146 static  v_post  posts_bl[] = { herr_eq0, bwarn_ge1, post_bl, NULL };
 147 static  v_post  posts_it[] = { post_it, NULL };
 148 static  v_post  posts_in[] = { ewarn_eq1, NULL };
 149 static  v_post  posts_ss[] = { herr_ge1, NULL };
 150 static  v_post  posts_pf[] = { eerr_eq1, NULL };
 151 static  v_post  posts_pp[] = { ewarn_eq0, NULL };
 152 static  v_post  posts_ex[] = { eerr_le1, post_ex, NULL };
 153 static  v_post  posts_an[] = { post_an, NULL };
 154 static  v_post  posts_at[] = { post_at, NULL };
 155 static  v_post  posts_xr[] = { eerr_ge1, eerr_le2, post_xr, NULL };
 156 static  v_post  posts_nm[] = { post_nm, NULL };
 157 static  v_post  posts_bf[] = { hwarn_le1, post_bf, NULL };
 158 static  v_post  posts_rs[] = { herr_eq0, bwarn_ge1, NULL };
 159 static  v_post  posts_fo[] = { hwarn_eq1, bwarn_ge1, NULL };
 160 static  v_post  posts_bk[] = { herr_eq0, bwarn_ge1, NULL };
 161 static  v_post  posts_fd[] = { ewarn_ge1, post_fd, NULL };
 162
 163 /* Per-macro pre- and post-child-check routine collections. */
 164
 165 const   struct valids mdoc_valids[MDOC_MAX] = {
 166         { NULL, NULL },                         /* \" */
 167         { pres_prologue, posts_text },          /* Dd */
 168         { pres_prologue, NULL },                /* Dt */
 169         { pres_prologue, NULL },                /* Os */
 170         { pres_sh, posts_sh },                  /* Sh */
 171         { pres_ss, posts_ss },                  /* Ss */
 172         { NULL, posts_pp },                     /* Pp */
 173         { pres_d1, posts_wline },               /* D1 */
 174         { pres_d1, posts_wline },               /* Dl */
 175         { pres_bd, posts_bd },                  /* Bd */
 176         { NULL, NULL },                         /* Ed */
 177         { pres_bl, posts_bl },                  /* Bl */
 178         { NULL, NULL },                         /* El */
 179         { pres_it, posts_it },                  /* It */
 180         { NULL, posts_text },                   /* Ad */
 181         { pres_an, posts_an },                  /* An */
 182         { NULL, NULL },                         /* Ar */
 183         { pres_cd, posts_text },                /* Cd */
 184         { NULL, NULL },                         /* Cm */
 185         { NULL, posts_text },                   /* Dv */
 186         { pres_er, posts_text },                /* Er */
 187         { NULL, posts_text },                   /* Ev */
 188         { pres_ex, posts_ex },                  /* Ex */
 189         { NULL, posts_text },                   /* Fa */
 190         { NULL, posts_fd },                     /* Fd */
 191         { NULL, NULL },                         /* Fl */
 192         { NULL, posts_text },                   /* Fn */
 193         { NULL, posts_wtext },                  /* Ft */
 194         { NULL, posts_text },                   /* Ic */
 195         { NULL, posts_in },                     /* In */
 196         { NULL, posts_text },                   /* Li */
 197         { NULL, posts_wtext },                  /* Nd */
 198         { NULL, posts_nm },                     /* Nm */
 199         { NULL, posts_wline },                  /* Op */
 200         { NULL, NULL },                         /* Ot */
 201         { NULL, NULL },                         /* Pa */
 202         { pres_rv, posts_notext },              /* Rv */
 203         { pres_st, posts_notext },              /* St */
 204         { NULL, posts_text },                   /* Va */
 205         { NULL, posts_text },                   /* Vt */
 206         { NULL, posts_xr },                     /* Xr */
 207         { NULL, posts_text },                   /* %A */
 208         { NULL, posts_text },                   /* %B */
 209         { NULL, posts_text },                   /* %D */
 210         { NULL, posts_text },                   /* %I */
 211         { NULL, posts_text },                   /* %J */
 212         { NULL, posts_text },                   /* %N */
 213         { NULL, posts_text },                   /* %O */
 214         { NULL, posts_text },                   /* %P */
 215         { NULL, posts_text },                   /* %R */
 216         { NULL, posts_text },                   /* %T */
 217         { NULL, posts_text },                   /* %V */
 218         { NULL, NULL },                         /* Ac */
 219         { NULL, NULL },                         /* Ao */
 220         { NULL, posts_wline },                  /* Aq */
 221         { NULL, posts_at },                     /* At */
 222         { NULL, NULL },                         /* Bc */
 223         { NULL, posts_bf },                     /* Bf */
 224         { NULL, NULL },                         /* Bo */
 225         { NULL, posts_wline },                  /* Bq */
 226         { NULL, NULL },                         /* Bsx */
 227         { NULL, NULL },                         /* Bx */
 228         { NULL, posts_bool },                   /* Db */
 229         { NULL, NULL },                         /* Dc */
 230         { NULL, NULL },                         /* Do */
 231         { NULL, posts_wline },                  /* Dq */
 232         { NULL, NULL },                         /* Ec */
 233         { NULL, NULL },                         /* Ef */
 234         { NULL, posts_text },                   /* Em */
 235         { NULL, NULL },                         /* Eo */
 236         { NULL, NULL },                         /* Fx */
 237         { NULL, posts_text },                   /* Ms */
 238         { NULL, posts_notext },                 /* No */
 239         { NULL, posts_notext },                 /* Ns */
 240         { NULL, NULL },                         /* Nx */
 241         { NULL, NULL },                         /* Ox */
 242         { NULL, NULL },                         /* Pc */
 243         { NULL, posts_pf },                     /* Pf */
 244         { NULL, NULL },                         /* Po */
 245         { NULL, posts_wline },                  /* Pq */
 246         { NULL, NULL },                         /* Qc */
 247         { NULL, posts_wline },                  /* Ql */
 248         { NULL, NULL },                         /* Qo */
 249         { NULL, posts_wline },                  /* Qq */
 250         { NULL, NULL },                         /* Re */
 251         { NULL, posts_rs },                     /* Rs */
 252         { NULL, NULL },                         /* Sc */
 253         { NULL, NULL },                         /* So */
 254         { NULL, posts_wline },                  /* Sq */
 255         { NULL, posts_bool },                   /* Sm */
 256         { NULL, posts_text },                   /* Sx */
 257         { NULL, posts_text },                   /* Sy */
 258         { NULL, posts_text },                   /* Tn */
 259         { NULL, NULL },                         /* Ux */
 260         { NULL, NULL },                         /* Xc */
 261         { NULL, NULL },                         /* Xo */
 262         { NULL, posts_fo },                     /* Fo */
 263         { NULL, NULL },                         /* Fc */
 264         { NULL, NULL },                         /* Oo */
 265         { NULL, NULL },                         /* Oc */
 266         { NULL, posts_bk },                     /* Bk */
 267         { NULL, NULL },                         /* Ek */
 268         { NULL, posts_notext },                 /* Bt */
 269         { NULL, NULL },                         /* Hf */
 270         { NULL, NULL },                         /* Fr */
 271         { NULL, posts_notext },                 /* Ud */
 272 };
 273
 274
 275 int
 276 mdoc_valid_pre(struct mdoc *mdoc,
 277                 const struct mdoc_node *node)
 278 {
 279         v_pre           *p;
 280         struct mdoc_arg *argv;
 281         size_t           argc;
 282         int              line, pos, i, j;
 283         const char      *tp;
 284
 285         if (MDOC_TEXT == node->type) {
 286                 tp = node->data.text.string;
 287                 line = node->line;
 288                 pos = node->pos;
 289                 return(check_text(mdoc, line, pos, tp));
 290         }
 291
 292         if (MDOC_BLOCK == node->type || MDOC_ELEM == node->type) {
 293                 argv = MDOC_BLOCK == node->type ?
 294                         node->data.block.argv :
 295                         node->data.elem.argv;
 296                 argc = MDOC_BLOCK == node->type ?
 297                         node->data.block.argc :
 298                         node->data.elem.argc;
 299
 300                 for (i = 0; i < (int)argc; i++) {
 301                         if (0 == argv[i].sz)
 302                                 continue;
 303                         for (j = 0; j < (int)argv[i].sz; j++) {
 304                                 tp = argv[i].value[j];
 305                                 line = argv[i].line;
 306                                 pos = argv[i].pos;
 307                                 if ( ! check_text(mdoc, line, pos, tp))
 308                                         return(0);
 309                         }
 310                 }
 311         }
 312
 313         if (NULL == mdoc_valids[node->tok].pre)
 314                 return(1);
 315         for (p = mdoc_valids[node->tok].pre; *p; p++)
 316                 if ( ! (*p)(mdoc, node))
 317                         return(0);
 318         return(1);
 319 }
 320
 321
 322 int
 323 mdoc_valid_post(struct mdoc *mdoc)
 324 {
 325         v_post          *p;
 326
 327         /*
 328          * This check occurs after the macro's children have been filled
 329          * in: postfix validation.  Since this happens when we're
 330          * rewinding the scope tree, it's possible to have multiple
 331          * invocations (as by design, for now), we set bit MDOC_VALID to
 332          * indicate that we've validated.
 333          */
 334
 335         if (MDOC_VALID & mdoc->last->flags)
 336                 return(1);
 337         mdoc->last->flags |= MDOC_VALID;
 338
 339         if (MDOC_TEXT == mdoc->last->type)
 340                 return(1);
 341         if (MDOC_ROOT == mdoc->last->type)
 342                 return(post_root(mdoc));
 343
 344         if (NULL == mdoc_valids[mdoc->last->tok].post)
 345                 return(1);
 346         for (p = mdoc_valids[mdoc->last->tok].post; *p; p++)
 347                 if ( ! (*p)(mdoc))
 348                         return(0);
 349
 350         return(1);
 351 }
 352
 353
 354
 355 static inline int
 356 warn_count(struct mdoc *m, const char *k,
 357                 int want, const char *v, int has)
 358 {
 359
 360         return(mdoc_warn(m, WARN_SYNTAX,
 361                                 "suggests %s %s %d (has %d)",
 362                                 v, k, want, has));
 363 }
 364
 365
 366 static inline int
 367 err_count(struct mdoc *m, const char *k,
 368                 int want, const char *v, int has)
 369 {
 370
 371         return(mdoc_err(m, "requires %s %s %d (has %d)",
 372                                 v, k, want, has));
 373 }
 374
 375
 376 static inline int
 377 count_child(struct mdoc *mdoc)
 378 {
 379         int               i;
 380         struct mdoc_node *n;
 381
 382         for (i = 0, n = mdoc->last->child; n; n = n->next, i++)
 383                 /* Do nothing */ ;
 384
 385         return(i);
 386 }
 387
 388
 389 /*
 390  * Build these up with macros because they're basically the same check
 391  * for different inequalities.  Yes, this could be done with functions,
 392  * but this is reasonable for now.
 393  */
 394
 395 #define CHECK_CHILD_DEFN(lvl, name, ineq)                       \
 396 static int                                                      \
 397 lvl##_child_##name(struct mdoc *mdoc, const char *p, int sz)    \
 398 {                                                               \
 399         int i;                                                  \
 400         if ((i = count_child(mdoc)) ineq sz)                    \
 401                 return(1);                                      \
 402         return(lvl##_count(mdoc, #ineq, sz, p, i));             \
 403 }
 404
 405 #define CHECK_BODY_DEFN(name, lvl, func, num)                   \
 406 static int                                                      \
 407 b##lvl##_##name(POST_ARGS)                                      \
 408 {                                                               \
 409         if (MDOC_BODY != mdoc->last->type)                      \
 410                 return(1);                                      \
 411         return(func(mdoc, "multiline parameters", (num)));      \
 412 }
 413
 414 #define CHECK_ELEM_DEFN(name, lvl, func, num)                   \
 415 static int                                                      \
 416 e##lvl##_##name(POST_ARGS)                                      \
 417 {                                                               \
 418         assert(MDOC_ELEM == mdoc->last->type);                  \
 419         return(func(mdoc, "line parameters", (num)));           \
 420 }
 421
 422 #define CHECK_HEAD_DEFN(name, lvl, func, num)                   \
 423 static int                                                      \
 424 h##lvl##_##name(POST_ARGS)                                      \
 425 {                                                               \
 426         if (MDOC_HEAD != mdoc->last->type)                      \
 427                 return(1);                                      \
 428         return(func(mdoc, "line parameters", (num)));           \
 429 }
 430
 431
 432 CHECK_CHILD_DEFN(warn, gt, >)                   /* warn_child_gt() */
 433 CHECK_CHILD_DEFN(err, gt, >)                    /* err_child_gt() */
 434 CHECK_CHILD_DEFN(warn, eq, ==)                  /* warn_child_eq() */
 435 CHECK_CHILD_DEFN(err, eq, ==)                   /* err_child_eq() */
 436 CHECK_CHILD_DEFN(err, lt, <)                    /* err_child_lt() */
 437 CHECK_CHILD_DEFN(warn, lt, <)                   /* warn_child_lt() */
 438 CHECK_BODY_DEFN(ge1, warn, warn_child_gt, 0)    /* bwarn_ge1() */
 439 CHECK_ELEM_DEFN(eq1, warn, warn_child_eq, 1)    /* ewarn_eq1() */
 440 CHECK_ELEM_DEFN(eq0, warn, warn_child_eq, 0)    /* ewarn_eq0() */
 441 CHECK_ELEM_DEFN(ge1, warn, warn_child_gt, 0)    /* ewarn_gt1() */
 442 CHECK_ELEM_DEFN(eq1, err, err_child_eq, 1)      /* eerr_eq1() */
 443 CHECK_ELEM_DEFN(le2, err, err_child_lt, 3)      /* eerr_le2() */
 444 CHECK_ELEM_DEFN(le1, err, err_child_lt, 2)      /* eerr_le1() */
 445 CHECK_ELEM_DEFN(eq0, err, err_child_eq, 0)      /* eerr_eq0() */
 446 CHECK_ELEM_DEFN(ge1, err, err_child_gt, 0)      /* eerr_ge1() */
 447 CHECK_HEAD_DEFN(eq0, err, err_child_eq, 0)      /* herr_eq0() */
 448 CHECK_HEAD_DEFN(le1, warn, warn_child_lt, 2)    /* hwarn_le1() */
 449 CHECK_HEAD_DEFN(ge1, err, err_child_gt, 0)      /* herr_ge1() */
 450 CHECK_HEAD_DEFN(eq1, warn, warn_child_eq, 1)    /* hwarn_eq1() */
 451
 452
 453 static int
 454 check_stdarg(PRE_ARGS)
 455 {
 456
 457         if (MDOC_Std == n->data.elem.argv[0].arg &&
 458                         1 == n->data.elem.argc)
 459                 return(1);
 460
 461         return(mdoc_nwarn(mdoc, n, WARN_COMPAT,
 462                                 "one argument suggested"));
 463 }
 464
 465
 466 static int
 467 check_msec(PRE_ARGS, int sz, enum mdoc_msec *msecs)
 468 {
 469         int              i;
 470
 471         for (i = 0; i < sz; i++)
 472                 if (msecs[i] == mdoc->meta.msec)
 473                         return(1);
 474         return(mdoc_nwarn(mdoc, n, WARN_COMPAT,
 475                                 "invalid manual section"));
 476 }
 477
 478
 479 static int
 480 check_text(struct mdoc *mdoc, int line, int pos, const char *p)
 481 {
 482         size_t           c;
 483
 484         /* XXX - indicate deprecated escapes \*(xx and \*x. */
 485
 486         for ( ; *p; p++) {
 487                 if ( ! isprint((int)*p) && '\t' != *p)
 488                         return(mdoc_perr(mdoc, line, pos,
 489                                         "invalid characters"));
 490                 if ('\\' != *p)
 491                         continue;
 492                 if ((c = mdoc_isescape(p))) {
 493                         p += (int)c - 1;
 494                         continue;
 495                 }
 496                 return(mdoc_perr(mdoc, line, pos,
 497                                         "invalid escape sequence"));
 498         }
 499
 500         return(1);
 501 }
 502
 503
 504
 505
 506 static int
 507 check_parent(PRE_ARGS, int tok, enum mdoc_type t)
 508 {
 509
 510         assert(n->parent);
 511         if ((MDOC_ROOT == t || tok == n->parent->tok) &&
 512                         (t == n->parent->type))
 513                 return(1);
 514
 515         return(mdoc_nerr(mdoc, n, "require parent %s",
 516                 MDOC_ROOT == t ? "<root>" : mdoc_macronames[tok]));
 517 }
 518
 519
 520
 521 static int
 522 pre_display(PRE_ARGS)
 523 {
 524         struct mdoc_node *node;
 525
 526         /* Display elements (`Bd', `D1'...) cannot be nested. */
 527
 528         if (MDOC_BLOCK != n->type)
 529                 return(1);
 530
 531         /* LINTED */
 532         for (node = mdoc->last->parent; node; node = node->parent)
 533                 if (MDOC_BLOCK == node->type)
 534                         if (MDOC_Bd == node->tok)
 535                                 break;
 536         if (NULL == node)
 537                 return(1);
 538
 539         return(mdoc_nerr(mdoc, n, "displays may not be nested"));
 540 }
 541
 542
 543 static int
 544 pre_bl(PRE_ARGS)
 545 {
 546         int              type, i, width, offset;
 547         struct mdoc_arg *argv;
 548         size_t           argc;
 549
 550         if (MDOC_BLOCK != n->type)
 551                 return(1);
 552
 553         argc = n->data.block.argc;
 554
 555         /* Make sure that only one type of list is specified.  */
 556
 557         type = offset = width = -1;
 558
 559         /* LINTED */
 560         for (i = 0; i < (int)argc; i++) {
 561                 argv = &n->data.block.argv[i];
 562
 563                 switch (argv->arg) {
 564                 case (MDOC_Bullet):
 565                         /* FALLTHROUGH */
 566                 case (MDOC_Dash):
 567                         /* FALLTHROUGH */
 568                 case (MDOC_Enum):
 569                         /* FALLTHROUGH */
 570                 case (MDOC_Hyphen):
 571                         /* FALLTHROUGH */
 572                 case (MDOC_Item):
 573                         /* FALLTHROUGH */
 574                 case (MDOC_Tag):
 575                         /* FALLTHROUGH */
 576                 case (MDOC_Diag):
 577                         /* FALLTHROUGH */
 578                 case (MDOC_Hang):
 579                         /* FALLTHROUGH */
 580                 case (MDOC_Ohang):
 581                         /* FALLTHROUGH */
 582                 case (MDOC_Inset):
 583                         /* FALLTHROUGH */
 584                 case (MDOC_Column):
 585                         if (-1 == type) {
 586                                 type = argv->arg;
 587                                 break;
 588                         }
 589                         return(mdoc_perr(mdoc, argv->line, argv->pos,
 590                                         "multiple types specified"));
 591                 case (MDOC_Width):
 592                         if (-1 == width) {
 593                                 width = argv->arg;
 594                                 break;
 595                         }
 596                         return(mdoc_perr(mdoc, argv->line, argv->pos,
 597                                         "multiple -%s arguments",
 598                                         mdoc_argnames[MDOC_Width]));
 599                 case (MDOC_Offset):
 600                         if (-1 == offset) {
 601                                 offset = argv->arg;
 602                                 break;
 603                         }
 604                         return(mdoc_perr(mdoc, argv->line, argv->pos,
 605                                         "multiple -%s arguments",
 606                                         mdoc_argnames[MDOC_Offset]));
 607                 default:
 608                         break;
 609                 }
 610         }
 611
 612         if (-1 == type)
 613                 return(mdoc_err(mdoc, "no type specified"));
 614
 615         switch (type) {
 616         case (MDOC_Column):
 617                 /* FALLTHROUGH */
 618         case (MDOC_Diag):
 619                 /* FALLTHROUGH */
 620         case (MDOC_Inset):
 621                 /* FALLTHROUGH */
 622         case (MDOC_Item):
 623                 if (-1 == width)
 624                         break;
 625                 return(mdoc_nwarn(mdoc, n, WARN_SYNTAX,
 626                                 "superfluous -%s argument",
 627                                 mdoc_argnames[MDOC_Width]));
 628         case (MDOC_Tag):
 629                 if (-1 != width)
 630                         break;
 631                 return(mdoc_nwarn(mdoc, n, WARN_SYNTAX,
 632                                 "suggest -%s argument",
 633                                 mdoc_argnames[MDOC_Width]));
 634         default:
 635                 break;
 636         }
 637
 638         return(1);
 639 }
 640
 641
 642 static int
 643 pre_bd(PRE_ARGS)
 644 {
 645         int              type, err, i;
 646         struct mdoc_arg *argv;
 647         size_t           argc;
 648
 649         if (MDOC_BLOCK != n->type)
 650                 return(1);
 651
 652         argc = n->data.block.argc;
 653
 654         /* Make sure that only one type of display is specified.  */
 655
 656         /* LINTED */
 657         for (i = 0, err = type = 0; ! err && i < (int)argc; i++) {
 658                 argv = &n->data.block.argv[i];
 659
 660                 switch (argv->arg) {
 661                 case (MDOC_Ragged):
 662                         /* FALLTHROUGH */
 663                 case (MDOC_Unfilled):
 664                         /* FALLTHROUGH */
 665                 case (MDOC_Filled):
 666                         /* FALLTHROUGH */
 667                 case (MDOC_Literal):
 668                         /* FALLTHROUGH */
 669                 case (MDOC_File):
 670                         if (0 == type++)
 671                                 break;
 672                         return(mdoc_perr(mdoc, argv->line, argv->pos,
 673                                         "multiple types specified"));
 674                 default:
 675                         break;
 676                 }
 677         }
 678
 679         if (type)
 680                 return(1);
 681         return(mdoc_err(mdoc, "no type specified"));
 682 }
 683
 684
 685 static int
 686 pre_ss(PRE_ARGS)
 687 {
 688
 689         if (MDOC_BLOCK != n->type)
 690                 return(1);
 691         return(check_parent(mdoc, n, MDOC_Sh, MDOC_BODY));
 692 }
 693
 694
 695 static int
 696 pre_sh(PRE_ARGS)
 697 {
 698
 699         if (MDOC_BLOCK != n->type)
 700                 return(1);
 701         return(check_parent(mdoc, n, -1, MDOC_ROOT));
 702 }
 703
 704
 705 static int
 706 pre_it(PRE_ARGS)
 707 {
 708
 709         /* TODO: children too big for -width? */
 710
 711         if (MDOC_BLOCK != n->type)
 712                 return(1);
 713         return(check_parent(mdoc, n, MDOC_Bl, MDOC_BODY));
 714 }
 715
 716
 717 static int
 718 pre_st(PRE_ARGS)
 719 {
 720
 721         if (1 == n->data.elem.argc)
 722                 return(1);
 723         return(mdoc_nerr(mdoc, n, "one argument required"));
 724 }
 725
 726
 727 static int
 728 pre_an(PRE_ARGS)
 729 {
 730
 731         if (1 >= n->data.elem.argc)
 732                 return(1);
 733         return(mdoc_nerr(mdoc, n, "one argument allowed"));
 734 }
 735
 736
 737 static int
 738 pre_rv(PRE_ARGS)
 739 {
 740         enum mdoc_msec msecs[] = { MSEC_2, MSEC_3 };
 741
 742         if ( ! check_msec(mdoc, n, 2, msecs))
 743                 return(0);
 744         return(check_stdarg(mdoc, n));
 745 }
 746
 747
 748 static int
 749 pre_ex(PRE_ARGS)
 750 {
 751         enum mdoc_msec msecs[] = { MSEC_1, MSEC_6, MSEC_8 };
 752
 753         if ( ! check_msec(mdoc, n, 3, msecs))
 754                 return(0);
 755         return(check_stdarg(mdoc, n));
 756 }
 757
 758
 759 static int
 760 pre_er(PRE_ARGS)
 761 {
 762         enum mdoc_msec msecs[] = { MSEC_2 };
 763
 764         return(check_msec(mdoc, n, 1, msecs));
 765 }
 766
 767
 768 static int
 769 pre_cd(PRE_ARGS)
 770 {
 771         enum mdoc_msec msecs[] = { MSEC_4 };
 772
 773         return(check_msec(mdoc, n, 1, msecs));
 774 }
 775
 776
 777 static int
 778 pre_prologue(PRE_ARGS)
 779 {
 780
 781         if (SEC_PROLOGUE != mdoc->lastnamed)
 782                 return(mdoc_nerr(mdoc, n, "prologue only"));
 783
 784         /* Check for ordering. */
 785
 786         switch (n->tok) {
 787         case (MDOC_Os):
 788                 if (mdoc->meta.title && mdoc->meta.date)
 789                         break;
 790                 return(mdoc_nerr(mdoc, n, "prologue out-of-order"));
 791         case (MDOC_Dt):
 792                 if (NULL == mdoc->meta.title && mdoc->meta.date)
 793                         break;
 794                 return(mdoc_nerr(mdoc, n, "prologue out-of-order"));
 795         case (MDOC_Dd):
 796                 if (NULL == mdoc->meta.title && 0 == mdoc->meta.date)
 797                         break;
 798                 return(mdoc_nerr(mdoc, n, "prologue out-of-order"));
 799         default:
 800                 abort();
 801                 /* NOTREACHED */
 802         }
 803
 804         /* Check for repetition. */
 805
 806         switch (n->tok) {
 807         case (MDOC_Os):
 808                 if (NULL == mdoc->meta.os)
 809                         return(1);
 810                 break;
 811         case (MDOC_Dd):
 812                 if (0 == mdoc->meta.date)
 813                         return(1);
 814                 break;
 815         case (MDOC_Dt):
 816                 if (NULL == mdoc->meta.title)
 817                         return(1);
 818                 break;
 819         default:
 820                 abort();
 821                 /* NOTREACHED */
 822         }
 823
 824         return(mdoc_nerr(mdoc, n, "prologue repetition"));
 825 }
 826
 827
 828 static int
 829 post_bf(POST_ARGS)
 830 {
 831         char             *p;
 832         struct mdoc_node *head;
 833
 834         if (MDOC_BLOCK != mdoc->last->type)
 835                 return(1);
 836
 837         head = mdoc->last->data.block.head;
 838
 839         if (0 == mdoc->last->data.block.argc) {
 840                 if (NULL == head->child)
 841                         return(mdoc_err(mdoc, "argument expected"));
 842
 843                 p = head->child->data.text.string;
 844                 if (xstrcmp(p, "Em"))
 845                         return(1);
 846                 else if (xstrcmp(p, "Li"))
 847                         return(1);
 848                 else if (xstrcmp(p, "Sm"))
 849                         return(1);
 850                 return(mdoc_nerr(mdoc, head->child, "invalid font"));
 851         }
 852
 853         if (head->child)
 854                 return(mdoc_err(mdoc, "argument expected"));
 855
 856         if (1 == mdoc->last->data.block.argc)
 857                 return(1);
 858         return(mdoc_err(mdoc, "argument expected"));
 859 }
 860
 861
 862 static int
 863 post_nm(POST_ARGS)
 864 {
 865
 866         if (mdoc->last->child)
 867                 return(1);
 868         if (mdoc->meta.name)
 869                 return(1);
 870         return(mdoc_err(mdoc, "not yet invoked with name"));
 871 }
 872
 873
 874 static int
 875 post_xr(POST_ARGS)
 876 {
 877         struct mdoc_node *n;
 878
 879         if (NULL == (n = mdoc->last->child->next))
 880                 return(1);
 881         if (MSEC_DEFAULT != mdoc_atomsec(n->data.text.string))
 882                 return(1);
 883         return(mdoc_nerr(mdoc, n, "invalid manual section"));
 884 }
 885
 886
 887 static int
 888 post_at(POST_ARGS)
 889 {
 890
 891         if (NULL == mdoc->last->child)
 892                 return(1);
 893         if (ATT_DEFAULT != mdoc_atoatt(mdoc->last->child->data.text.string))
 894                 return(1);
 895         return(mdoc_err(mdoc, "require valid symbol"));
 896 }
 897
 898
 899 static int
 900 post_an(POST_ARGS)
 901 {
 902
 903         if (0 != mdoc->last->data.elem.argc) {
 904                 if (NULL == mdoc->last->child)
 905                         return(1);
 906                 return(mdoc_err(mdoc, "argument(s) expected"));
 907         }
 908
 909         if (mdoc->last->child)
 910                 return(1);
 911         return(mdoc_err(mdoc, "argument(s) expected"));
 912 }
 913
 914
 915 static int
 916 post_ex(POST_ARGS)
 917 {
 918
 919         if (0 == mdoc->last->data.elem.argc) {
 920                 if (mdoc->last->child)
 921                         return(1);
 922                 return(mdoc_err(mdoc, "argument(s) expected"));
 923         }
 924         if (mdoc->last->child)
 925                 return(mdoc_err(mdoc, "argument(s) expected"));
 926         if (1 != mdoc->last->data.elem.argc)
 927                 return(mdoc_err(mdoc, "argument(s) expected"));
 928         if (MDOC_Std != mdoc->last->data.elem.argv[0].arg)
 929                 return(mdoc_err(mdoc, "argument(s) expected"));
 930
 931         return(1);
 932 }
 933
 934
 935 static int
 936 post_it(POST_ARGS)
 937 {
 938         int               type, sv, i;
 939 #define TYPE_NONE        (0)
 940 #define TYPE_BODY        (1)
 941 #define TYPE_HEAD        (2)
 942 #define TYPE_OHEAD       (3)
 943         size_t            argc;
 944         struct mdoc_node *n;
 945
 946         if (MDOC_BLOCK != mdoc->last->type)
 947                 return(1);
 948
 949         n = mdoc->last->parent->parent;
 950
 951         argc = n->data.block.argc;
 952         type = TYPE_NONE;
 953         sv = -1;
 954
 955         /* Some types require block-head, some not. */
 956
 957         /* LINTED */
 958         for (i = 0; TYPE_NONE == type && i < (int)argc; i++)
 959                 switch (n->data.block.argv[i].arg) {
 960                 case (MDOC_Tag):
 961                         /* FALLTHROUGH */
 962                 case (MDOC_Diag):
 963                         /* FALLTHROUGH */
 964                 case (MDOC_Hang):
 965                         /* FALLTHROUGH */
 966                 case (MDOC_Ohang):
 967                         /* FALLTHROUGH */
 968                 case (MDOC_Inset):
 969                         type = TYPE_HEAD;
 970                         sv = n->data.block.argv[i].arg;
 971                         break;
 972                 case (MDOC_Bullet):
 973                         /* FALLTHROUGH */
 974                 case (MDOC_Dash):
 975                         /* FALLTHROUGH */
 976                 case (MDOC_Enum):
 977                         /* FALLTHROUGH */
 978                 case (MDOC_Hyphen):
 979                         /* FALLTHROUGH */
 980                 case (MDOC_Item):
 981                         type = TYPE_BODY;
 982                         sv = n->data.block.argv[i].arg;
 983                         break;
 984                 case (MDOC_Column):
 985                         type = TYPE_OHEAD;
 986                         sv = n->data.block.argv[i].arg;
 987                         break;
 988                 default:
 989                         break;
 990                 }
 991
 992         assert(TYPE_NONE != type);
 993
 994         n = mdoc->last->data.block.head;
 995
 996         if (TYPE_HEAD == type) {
 997                 if (NULL == n->child)
 998                         if ( ! mdoc_warn(mdoc, WARN_SYNTAX,
 999                                         "argument(s) suggested"))
1000                                 return(0);
1001
1002                 n = mdoc->last->data.block.body;
1003                 if (NULL == n->child)
1004                         if ( ! mdoc_warn(mdoc, WARN_SYNTAX,
1005                                         "multiline body suggested"))
1006                                 return(0);
1007
1008         } else if (TYPE_BODY == type) {
1009                 if (n->child)
1010                         if ( ! mdoc_warn(mdoc, WARN_SYNTAX,
1011                                         "no argument suggested"))
1012                                 return(0);
1013
1014                 n = mdoc->last->data.block.body;
1015                 if (NULL == n->child)
1016                         if ( ! mdoc_warn(mdoc, WARN_SYNTAX,
1017                                         "multiline body suggested"))
1018                                 return(0);
1019         } else {
1020                 if (NULL == n->child)
1021                         if ( ! mdoc_warn(mdoc, WARN_SYNTAX,
1022                                         "argument(s) suggested"))
1023                                 return(0);
1024
1025                 n = mdoc->last->data.block.body;
1026                 if (n->child)
1027                         if ( ! mdoc_warn(mdoc, WARN_SYNTAX,
1028                                         "no multiline body suggested"))
1029                                 return(0);
1030         }
1031
1032         if (MDOC_Column != sv)
1033                 return(1);
1034
1035         argc = mdoc->last->parent->parent->data.block.argv->sz;
1036         n = mdoc->last->data.block.head->child;
1037
1038         for (i = 0; n; n = n->next)
1039                 i++;
1040
1041         if (i == (int)argc)
1042                 return(1);
1043
1044         return(mdoc_err(mdoc, "need %zu columns (have %d)", argc, i));
1045 #undef  TYPE_NONE
1046 #undef  TYPE_BODY
1047 #undef  TYPE_HEAD
1048 #undef  TYPE_OHEAD
1049 }
1050
1051
1052 static int
1053 post_bl(POST_ARGS)
1054 {
1055         struct mdoc_node        *n;
1056
1057         if (MDOC_BODY != mdoc->last->type)
1058                 return(1);
1059
1060         /* LINTED */
1061         for (n = mdoc->last->child; n; n = n->next) {
1062                 if (MDOC_BLOCK == n->type)
1063                         if (MDOC_It == n->tok)
1064                                 continue;
1065                 break;
1066         }
1067
1068         if (NULL == n)
1069                 return(1);
1070
1071         return(mdoc_nerr(mdoc, n, "bad child of parent list"));
1072 }
1073
1074
1075 static int
1076 ebool(struct mdoc *mdoc)
1077 {
1078         struct mdoc_node *n;
1079
1080         /* LINTED */
1081         for (n = mdoc->last->child; n; n = n->next) {
1082                 if (MDOC_TEXT != n->type)
1083                         break;
1084                 if (xstrcmp(n->data.text.string, "on"))
1085                         continue;
1086                 if (xstrcmp(n->data.text.string, "off"))
1087                         continue;
1088                 break;
1089         }
1090
1091         if (NULL == n)
1092                 return(1);
1093         return(mdoc_nerr(mdoc, n, "expected boolean"));
1094 }
1095
1096
1097 static int
1098 post_root(POST_ARGS)
1099 {
1100
1101         if (NULL == mdoc->first->child)
1102                 return(mdoc_err(mdoc, "document lacks data"));
1103         if (SEC_PROLOGUE == mdoc->lastnamed)
1104                 return(mdoc_err(mdoc, "document lacks prologue"));
1105
1106         if (MDOC_BLOCK != mdoc->first->child->type)
1107                 return(mdoc_err(mdoc, "lacking post-prologue %s",
1108                                         mdoc_macronames[MDOC_Sh]));
1109         if (MDOC_Sh != mdoc->first->child->tok)
1110                 return(mdoc_err(mdoc, "lacking post-prologue %s",
1111                                         mdoc_macronames[MDOC_Sh]));
1112
1113         return(1);
1114 }
1115
1116
1117 static int
1118 post_sh(POST_ARGS)
1119 {
1120
1121         if (MDOC_HEAD == mdoc->last->type)
1122                 return(post_sh_head(mdoc));
1123         if (MDOC_BODY == mdoc->last->type)
1124                 return(post_sh_body(mdoc));
1125
1126         return(1);
1127 }
1128
1129
1130 static int
1131 post_sh_body(POST_ARGS)
1132 {
1133         struct mdoc_node *n;
1134
1135         if (SEC_NAME != mdoc->lastnamed)
1136                 return(1);
1137
1138         /*
1139          * Warn if the NAME section doesn't contain the `Nm' and `Nd'
1140          * macros (can have multiple `Nm' and one `Nd').  Note that the
1141          * children of the BODY declaration can also be "text".
1142          */
1143
1144         if (NULL == (n = mdoc->last->child))
1145                 return(mdoc_warn(mdoc, WARN_SYNTAX,
1146                                         "section should have %s and %s",
1147                                         mdoc_macronames[MDOC_Nm],
1148                                         mdoc_macronames[MDOC_Nd]));
1149
1150         for ( ; n && n->next; n = n->next) {
1151                 if (MDOC_ELEM == n->type && MDOC_Nm == n->tok)
1152                         continue;
1153                 if (MDOC_TEXT == n->type)
1154                         continue;
1155                 if ( ! (mdoc_nwarn(mdoc, n, WARN_SYNTAX,
1156                                         "section should have %s first",
1157                                         mdoc_macronames[MDOC_Nm])))
1158                         return(0);
1159         }
1160
1161         if (MDOC_ELEM == n->type && MDOC_Nd == n->tok)
1162                 return(1);
1163
1164         return(mdoc_warn(mdoc, WARN_SYNTAX,
1165                                 "section should have %s last",
1166                                 mdoc_macronames[MDOC_Nd]));
1167 }
1168
1169
1170 static int
1171 post_sh_head(POST_ARGS)
1172 {
1173         char              buf[64];
1174         enum mdoc_sec     sec;
1175
1176         assert(MDOC_Sh == mdoc->last->tok);
1177
1178         if ( ! xstrlcats(buf, mdoc->last->child, sizeof(buf)))
1179                 return(mdoc_err(mdoc, "argument too long"));
1180
1181         sec = mdoc_atosec(buf);
1182
1183         if (SEC_BODY == mdoc->lastnamed && SEC_NAME != sec)
1184                 return(mdoc_warn(mdoc, WARN_SYNTAX,
1185                                 "section NAME should be first"));
1186         if (SEC_CUSTOM == sec)
1187                 return(1);
1188         if (sec == mdoc->lastnamed)
1189                 return(mdoc_warn(mdoc, WARN_SYNTAX,
1190                                 "section repeated"));
1191         if (sec < mdoc->lastnamed)
1192                 return(mdoc_warn(mdoc, WARN_SYNTAX,
1193                                 "section out of order"));
1194
1195         return(1);
1196 }
1197
1198
1199 static int
1200 post_fd(POST_ARGS)
1201 {
1202
1203         if (SEC_SYNOPSIS == mdoc->last->sec)
1204                 return(1);
1205         return(mdoc_warn(mdoc, WARN_COMPAT,
1206                         "suggested only in section SYNOPSIS"));
1207 }