bin/mandoc/mdoc.c

   1 /*      $Id: mdoc.c,v 1.260 2017/02/16 03:00:23 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2010, 2012-2017 Ingo Schwarze <schwarze@openbsd.org>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include "config.h"
  19
  20 #include <sys/types.h>
  21
  22 #include <assert.h>
  23 #include <ctype.h>
  24 #include <stdarg.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <time.h>
  29
  30 #include "mandoc_aux.h"
  31 #include "mandoc.h"
  32 #include "roff.h"
  33 #include "mdoc.h"
  34 #include "libmandoc.h"
  35 #include "roff_int.h"
  36 #include "libmdoc.h"
  37
  38 const   char *const __mdoc_macronames[MDOC_MAX + 1] = {
  39         "text",
  40         "Ap",           "Dd",           "Dt",           "Os",
  41         "Sh",           "Ss",           "Pp",           "D1",
  42         "Dl",           "Bd",           "Ed",           "Bl",
  43         "El",           "It",           "Ad",           "An",
  44         "Ar",           "Cd",           "Cm",           "Dv",
  45         "Er",           "Ev",           "Ex",           "Fa",
  46         "Fd",           "Fl",           "Fn",           "Ft",
  47         "Ic",           "In",           "Li",           "Nd",
  48         "Nm",           "Op",           "Ot",           "Pa",
  49         "Rv",           "St",           "Va",           "Vt",
  50         "Xr",           "%A",           "%B",           "%D",
  51         "%I",           "%J",           "%N",           "%O",
  52         "%P",           "%R",           "%T",           "%V",
  53         "Ac",           "Ao",           "Aq",           "At",
  54         "Bc",           "Bf",           "Bo",           "Bq",
  55         "Bsx",          "Bx",           "Db",           "Dc",
  56         "Do",           "Dq",           "Ec",           "Ef",
  57         "Em",           "Eo",           "Fx",           "Ms",
  58         "No",           "Ns",           "Nx",           "Ox",
  59         "Pc",           "Pf",           "Po",           "Pq",
  60         "Qc",           "Ql",           "Qo",           "Qq",
  61         "Re",           "Rs",           "Sc",           "So",
  62         "Sq",           "Sm",           "Sx",           "Sy",
  63         "Tn",           "Ux",           "Xc",           "Xo",
  64         "Fo",           "Fc",           "Oo",           "Oc",
  65         "Bk",           "Ek",           "Bt",           "Hf",
  66         "Fr",           "Ud",           "Lb",           "Lp",
  67         "Lk",           "Mt",           "Brq",          "Bro",
  68         "Brc",          "%C",           "Es",           "En",
  69         "Dx",           "%Q",           "br",           "sp",
  70         "%U",           "Ta",           "ll",
  71 };
  72
  73 const   char *const __mdoc_argnames[MDOC_ARG_MAX] = {
  74         "split",                "nosplit",              "ragged",
  75         "unfilled",             "literal",              "file",
  76         "offset",               "bullet",               "dash",
  77         "hyphen",               "item",                 "enum",
  78         "tag",                  "diag",                 "hang",
  79         "ohang",                "inset",                "column",
  80         "width",                "compact",              "std",
  81         "filled",               "words",                "emphasis",
  82         "symbolic",             "nested",               "centered"
  83         };
  84
  85 const   char * const *mdoc_macronames = __mdoc_macronames + 1;
  86 const   char * const *mdoc_argnames = __mdoc_argnames;
  87
  88 static  int               mdoc_ptext(struct roff_man *, int, char *, int);
  89 static  int               mdoc_pmacro(struct roff_man *, int, char *, int);
  90
  91
  92 /*
  93  * Main parse routine.  Parses a single line -- really just hands off to
  94  * the macro (mdoc_pmacro()) or text parser (mdoc_ptext()).
  95  */
  96 int
  97 mdoc_parseln(struct roff_man *mdoc, int ln, char *buf, int offs)
  98 {
  99
 100         if (mdoc->last->type != ROFFT_EQN || ln > mdoc->last->line)
 101                 mdoc->flags |= MDOC_NEWLINE;
 102
 103         /*
 104          * Let the roff nS register switch SYNOPSIS mode early,
 105          * such that the parser knows at all times
 106          * whether this mode is on or off.
 107          * Note that this mode is also switched by the Sh macro.
 108          */
 109         if (roff_getreg(mdoc->roff, "nS"))
 110                 mdoc->flags |= MDOC_SYNOPSIS;
 111         else
 112                 mdoc->flags &= ~MDOC_SYNOPSIS;
 113
 114         return roff_getcontrol(mdoc->roff, buf, &offs) ?
 115             mdoc_pmacro(mdoc, ln, buf, offs) :
 116             mdoc_ptext(mdoc, ln, buf, offs);
 117 }
 118
 119 void
 120 mdoc_macro(MACRO_PROT_ARGS)
 121 {
 122         assert(tok > TOKEN_NONE && tok < MDOC_MAX);
 123
 124         (*mdoc_macros[tok].fp)(mdoc, tok, line, ppos, pos, buf);
 125 }
 126
 127 void
 128 mdoc_tail_alloc(struct roff_man *mdoc, int line, int pos, int tok)
 129 {
 130         struct roff_node *p;
 131
 132         p = roff_node_alloc(mdoc, line, pos, ROFFT_TAIL, tok);
 133         roff_node_append(mdoc, p);
 134         mdoc->next = ROFF_NEXT_CHILD;
 135 }
 136
 137 struct roff_node *
 138 mdoc_endbody_alloc(struct roff_man *mdoc, int line, int pos, int tok,
 139                 struct roff_node *body)
 140 {
 141         struct roff_node *p;
 142
 143         body->flags |= NODE_ENDED;
 144         body->parent->flags |= NODE_ENDED;
 145         p = roff_node_alloc(mdoc, line, pos, ROFFT_BODY, tok);
 146         p->body = body;
 147         p->norm = body->norm;
 148         p->end = ENDBODY_SPACE;
 149         roff_node_append(mdoc, p);
 150         mdoc->next = ROFF_NEXT_SIBLING;
 151         return p;
 152 }
 153
 154 struct roff_node *
 155 mdoc_block_alloc(struct roff_man *mdoc, int line, int pos,
 156         int tok, struct mdoc_arg *args)
 157 {
 158         struct roff_node *p;
 159
 160         p = roff_node_alloc(mdoc, line, pos, ROFFT_BLOCK, tok);
 161         p->args = args;
 162         if (p->args)
 163                 (args->refcnt)++;
 164
 165         switch (tok) {
 166         case MDOC_Bd:
 167         case MDOC_Bf:
 168         case MDOC_Bl:
 169         case MDOC_En:
 170         case MDOC_Rs:
 171                 p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
 172                 break;
 173         default:
 174                 break;
 175         }
 176         roff_node_append(mdoc, p);
 177         mdoc->next = ROFF_NEXT_CHILD;
 178         return p;
 179 }
 180
 181 void
 182 mdoc_elem_alloc(struct roff_man *mdoc, int line, int pos,
 183         int tok, struct mdoc_arg *args)
 184 {
 185         struct roff_node *p;
 186
 187         p = roff_node_alloc(mdoc, line, pos, ROFFT_ELEM, tok);
 188         p->args = args;
 189         if (p->args)
 190                 (args->refcnt)++;
 191
 192         switch (tok) {
 193         case MDOC_An:
 194                 p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
 195                 break;
 196         default:
 197                 break;
 198         }
 199         roff_node_append(mdoc, p);
 200         mdoc->next = ROFF_NEXT_CHILD;
 201 }
 202
 203 void
 204 mdoc_node_relink(struct roff_man *mdoc, struct roff_node *p)
 205 {
 206
 207         roff_node_unlink(mdoc, p);
 208         p->prev = p->next = NULL;
 209         roff_node_append(mdoc, p);
 210 }
 211
 212 /*
 213  * Parse free-form text, that is, a line that does not begin with the
 214  * control character.
 215  */
 216 static int
 217 mdoc_ptext(struct roff_man *mdoc, int line, char *buf, int offs)
 218 {
 219         struct roff_node *n;
 220         char             *c, *ws, *end;
 221
 222         n = mdoc->last;
 223
 224         /*
 225          * If a column list contains plain text, assume an implicit item
 226          * macro.  This can happen one or more times at the beginning
 227          * of such a list, intermixed with non-It mdoc macros and with
 228          * nodes generated on the roff level, for example by tbl.
 229          */
 230
 231         if ((n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
 232              n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) ||
 233             (n->parent != NULL && n->parent->tok == MDOC_Bl &&
 234              n->parent->norm->Bl.type == LIST_column)) {
 235                 mdoc->flags |= MDOC_FREECOL;
 236                 mdoc_macro(mdoc, MDOC_It, line, offs, &offs, buf);
 237                 return 1;
 238         }
 239
 240         /*
 241          * Search for the beginning of unescaped trailing whitespace (ws)
 242          * and for the first character not to be output (end).
 243          */
 244
 245         /* FIXME: replace with strcspn(). */
 246         ws = NULL;
 247         for (c = end = buf + offs; *c; c++) {
 248                 switch (*c) {
 249                 case ' ':
 250                         if (NULL == ws)
 251                                 ws = c;
 252                         continue;
 253                 case '\t':
 254                         /*
 255                          * Always warn about trailing tabs,
 256                          * even outside literal context,
 257                          * where they should be put on the next line.
 258                          */
 259                         if (NULL == ws)
 260                                 ws = c;
 261                         /*
 262                          * Strip trailing tabs in literal context only;
 263                          * outside, they affect the next line.
 264                          */
 265                         if (MDOC_LITERAL & mdoc->flags)
 266                                 continue;
 267                         break;
 268                 case '\\':
 269                         /* Skip the escaped character, too, if any. */
 270                         if (c[1])
 271                                 c++;
 272                         /* FALLTHROUGH */
 273                 default:
 274                         ws = NULL;
 275                         break;
 276                 }
 277                 end = c + 1;
 278         }
 279         *end = '\0';
 280
 281         if (ws)
 282                 mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
 283                     line, (int)(ws-buf), NULL);
 284
 285         if (buf[offs] == '\0' && ! (mdoc->flags & MDOC_LITERAL)) {
 286                 mandoc_msg(MANDOCERR_FI_BLANK, mdoc->parse,
 287                     line, (int)(c - buf), NULL);
 288
 289                 /*
 290                  * Insert a `sp' in the case of a blank line.  Technically,
 291                  * blank lines aren't allowed, but enough manuals assume this
 292                  * behaviour that we want to work around it.
 293                  */
 294                 roff_elem_alloc(mdoc, line, offs, MDOC_sp);
 295                 mdoc->last->flags |= NODE_VALID | NODE_ENDED;
 296                 mdoc->next = ROFF_NEXT_SIBLING;
 297                 return 1;
 298         }
 299
 300         roff_word_alloc(mdoc, line, offs, buf+offs);
 301
 302         if (mdoc->flags & MDOC_LITERAL)
 303                 return 1;
 304
 305         /*
 306          * End-of-sentence check.  If the last character is an unescaped
 307          * EOS character, then flag the node as being the end of a
 308          * sentence.  The front-end will know how to interpret this.
 309          */
 310
 311         assert(buf < end);
 312
 313         if (mandoc_eos(buf+offs, (size_t)(end-buf-offs)))
 314                 mdoc->last->flags |= NODE_EOS;
 315
 316         for (c = buf + offs; c != NULL; c = strchr(c + 1, '.')) {
 317                 if (c - buf < offs + 2)
 318                         continue;
 319                 if (end - c < 4)
 320                         break;
 321                 if (isalpha((unsigned char)c[-2]) &&
 322                     isalpha((unsigned char)c[-1]) &&
 323                     c[1] == ' ' &&
 324                     isupper((unsigned char)(c[2] == ' ' ? c[3] : c[2])) &&
 325                     (c[-2] != 'n' || c[-1] != 'c') &&
 326                     (c[-2] != 'v' || c[-1] != 's'))
 327                         mandoc_msg(MANDOCERR_EOS, mdoc->parse,
 328                             line, (int)(c - buf), NULL);
 329         }
 330
 331         return 1;
 332 }
 333
 334 /*
 335  * Parse a macro line, that is, a line beginning with the control
 336  * character.
 337  */
 338 static int
 339 mdoc_pmacro(struct roff_man *mdoc, int ln, char *buf, int offs)
 340 {
 341         struct roff_node *n;
 342         const char       *cp;
 343         int               tok;
 344         int               i, sv;
 345         char              mac[5];
 346
 347         sv = offs;
 348
 349         /*
 350          * Copy the first word into a nil-terminated buffer.
 351          * Stop when a space, tab, escape, or eoln is encountered.
 352          */
 353
 354         i = 0;
 355         while (i < 4 && strchr(" \t\\", buf[offs]) == NULL)
 356                 mac[i++] = buf[offs++];
 357
 358         mac[i] = '\0';
 359
 360         tok = (i > 1 && i < 4) ? mdoc_hash_find(mac) : TOKEN_NONE;
 361
 362         if (tok == TOKEN_NONE) {
 363                 mandoc_msg(MANDOCERR_MACRO, mdoc->parse,
 364                     ln, sv, buf + sv - 1);
 365                 return 1;
 366         }
 367
 368         /* Skip a leading escape sequence or tab. */
 369
 370         switch (buf[offs]) {
 371         case '\\':
 372                 cp = buf + offs + 1;
 373                 mandoc_escape(&cp, NULL, NULL);
 374                 offs = cp - buf;
 375                 break;
 376         case '\t':
 377                 offs++;
 378                 break;
 379         default:
 380                 break;
 381         }
 382
 383         /* Jump to the next non-whitespace word. */
 384
 385         while (buf[offs] && ' ' == buf[offs])
 386                 offs++;
 387
 388         /*
 389          * Trailing whitespace.  Note that tabs are allowed to be passed
 390          * into the parser as "text", so we only warn about spaces here.
 391          */
 392
 393         if ('\0' == buf[offs] && ' ' == buf[offs - 1])
 394                 mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
 395                     ln, offs - 1, NULL);
 396
 397         /*
 398          * If an initial macro or a list invocation, divert directly
 399          * into macro processing.
 400          */
 401
 402         n = mdoc->last;
 403         if (n == NULL || tok == MDOC_It || tok == MDOC_El) {
 404                 mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
 405                 return 1;
 406         }
 407
 408         /*
 409          * If a column list contains a non-It macro, assume an implicit
 410          * item macro.  This can happen one or more times at the
 411          * beginning of such a list, intermixed with text lines and
 412          * with nodes generated on the roff level, for example by tbl.
 413          */
 414
 415         if ((n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
 416              n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) ||
 417             (n->parent != NULL && n->parent->tok == MDOC_Bl &&
 418              n->parent->norm->Bl.type == LIST_column)) {
 419                 mdoc->flags |= MDOC_FREECOL;
 420                 mdoc_macro(mdoc, MDOC_It, ln, sv, &sv, buf);
 421                 return 1;
 422         }
 423
 424         /* Normal processing of a macro. */
 425
 426         mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
 427
 428         /* In quick mode (for mandocdb), abort after the NAME section. */
 429
 430         if (mdoc->quick && MDOC_Sh == tok &&
 431             SEC_NAME != mdoc->last->sec)
 432                 return 2;
 433
 434         return 1;
 435 }
 436
 437 enum mdelim
 438 mdoc_isdelim(const char *p)
 439 {
 440
 441         if ('\0' == p[0])
 442                 return DELIM_NONE;
 443
 444         if ('\0' == p[1])
 445                 switch (p[0]) {
 446                 case '(':
 447                 case '[':
 448                         return DELIM_OPEN;
 449                 case '|':
 450                         return DELIM_MIDDLE;
 451                 case '.':
 452                 case ',':
 453                 case ';':
 454                 case ':':
 455                 case '?':
 456                 case '!':
 457                 case ')':
 458                 case ']':
 459                         return DELIM_CLOSE;
 460                 default:
 461                         return DELIM_NONE;
 462                 }
 463
 464         if ('\\' != p[0])
 465                 return DELIM_NONE;
 466
 467         if (0 == strcmp(p + 1, "."))
 468                 return DELIM_CLOSE;
 469         if (0 == strcmp(p + 1, "fR|\\fP"))
 470                 return DELIM_MIDDLE;
 471
 472         return DELIM_NONE;
 473 }
 474
 475 void
 476 mdoc_validate(struct roff_man *mdoc)
 477 {
 478
 479         mdoc->last = mdoc->first;
 480         mdoc_node_validate(mdoc);
 481         mdoc_state_reset(mdoc);
 482 }