mdoc.c

   1 /*      $Id: mdoc.c,v 1.255 2015/10/20 02:01:31 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2010, 2012-2015 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, enum mdoc_endbody end)
 140 {
 141         struct roff_node *p;
 142
 143         body->flags |= MDOC_ENDED;
 144         body->parent->flags |= MDOC_ENDED;
 145         p = roff_node_alloc(mdoc, line, pos, ROFFT_BODY, tok);
 146         p->body = body;
 147         p->norm = body->norm;
 148         p->end = end;
 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         roff_node_append(mdoc, p);
 209 }
 210
 211 /*
 212  * Parse free-form text, that is, a line that does not begin with the
 213  * control character.
 214  */
 215 static int
 216 mdoc_ptext(struct roff_man *mdoc, int line, char *buf, int offs)
 217 {
 218         struct roff_node *n;
 219         char             *c, *ws, *end;
 220
 221         assert(mdoc->last);
 222         n = mdoc->last;
 223
 224         /*
 225          * Divert directly to list processing if we're encountering a
 226          * columnar ROFFT_BLOCK with or without a prior ROFFT_BLOCK entry
 227          * (a ROFFT_BODY means it's already open, in which case we should
 228          * process within its context in the normal way).
 229          */
 230
 231         if (n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
 232             n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) {
 233                 /* `Bl' is open without any children. */
 234                 mdoc->flags |= MDOC_FREECOL;
 235                 mdoc_macro(mdoc, MDOC_It, line, offs, &offs, buf);
 236                 return 1;
 237         }
 238
 239         if (n->tok == MDOC_It && n->type == ROFFT_BLOCK &&
 240             NULL != n->parent &&
 241             MDOC_Bl == n->parent->tok &&
 242             LIST_column == n->parent->norm->Bl.type) {
 243                 /* `Bl' has block-level `It' children. */
 244                 mdoc->flags |= MDOC_FREECOL;
 245                 mdoc_macro(mdoc, MDOC_It, line, offs, &offs, buf);
 246                 return 1;
 247         }
 248
 249         /*
 250          * Search for the beginning of unescaped trailing whitespace (ws)
 251          * and for the first character not to be output (end).
 252          */
 253
 254         /* FIXME: replace with strcspn(). */
 255         ws = NULL;
 256         for (c = end = buf + offs; *c; c++) {
 257                 switch (*c) {
 258                 case ' ':
 259                         if (NULL == ws)
 260                                 ws = c;
 261                         continue;
 262                 case '\t':
 263                         /*
 264                          * Always warn about trailing tabs,
 265                          * even outside literal context,
 266                          * where they should be put on the next line.
 267                          */
 268                         if (NULL == ws)
 269                                 ws = c;
 270                         /*
 271                          * Strip trailing tabs in literal context only;
 272                          * outside, they affect the next line.
 273                          */
 274                         if (MDOC_LITERAL & mdoc->flags)
 275                                 continue;
 276                         break;
 277                 case '\\':
 278                         /* Skip the escaped character, too, if any. */
 279                         if (c[1])
 280                                 c++;
 281                         /* FALLTHROUGH */
 282                 default:
 283                         ws = NULL;
 284                         break;
 285                 }
 286                 end = c + 1;
 287         }
 288         *end = '\0';
 289
 290         if (ws)
 291                 mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
 292                     line, (int)(ws-buf), NULL);
 293
 294         if (buf[offs] == '\0' && ! (mdoc->flags & MDOC_LITERAL)) {
 295                 mandoc_msg(MANDOCERR_FI_BLANK, mdoc->parse,
 296                     line, (int)(c - buf), NULL);
 297
 298                 /*
 299                  * Insert a `sp' in the case of a blank line.  Technically,
 300                  * blank lines aren't allowed, but enough manuals assume this
 301                  * behaviour that we want to work around it.
 302                  */
 303                 roff_elem_alloc(mdoc, line, offs, MDOC_sp);
 304                 mdoc->last->flags |= MDOC_VALID | MDOC_ENDED;
 305                 mdoc->next = ROFF_NEXT_SIBLING;
 306                 return 1;
 307         }
 308
 309         roff_word_alloc(mdoc, line, offs, buf+offs);
 310
 311         if (mdoc->flags & MDOC_LITERAL)
 312                 return 1;
 313
 314         /*
 315          * End-of-sentence check.  If the last character is an unescaped
 316          * EOS character, then flag the node as being the end of a
 317          * sentence.  The front-end will know how to interpret this.
 318          */
 319
 320         assert(buf < end);
 321
 322         if (mandoc_eos(buf+offs, (size_t)(end-buf-offs)))
 323                 mdoc->last->flags |= MDOC_EOS;
 324         return 1;
 325 }
 326
 327 /*
 328  * Parse a macro line, that is, a line beginning with the control
 329  * character.
 330  */
 331 static int
 332 mdoc_pmacro(struct roff_man *mdoc, int ln, char *buf, int offs)
 333 {
 334         struct roff_node *n;
 335         const char       *cp;
 336         int               tok;
 337         int               i, sv;
 338         char              mac[5];
 339
 340         sv = offs;
 341
 342         /*
 343          * Copy the first word into a nil-terminated buffer.
 344          * Stop when a space, tab, escape, or eoln is encountered.
 345          */
 346
 347         i = 0;
 348         while (i < 4 && strchr(" \t\\", buf[offs]) == NULL)
 349                 mac[i++] = buf[offs++];
 350
 351         mac[i] = '\0';
 352
 353         tok = (i > 1 && i < 4) ? mdoc_hash_find(mac) : TOKEN_NONE;
 354
 355         if (tok == TOKEN_NONE) {
 356                 mandoc_msg(MANDOCERR_MACRO, mdoc->parse,
 357                     ln, sv, buf + sv - 1);
 358                 return 1;
 359         }
 360
 361         /* Skip a leading escape sequence or tab. */
 362
 363         switch (buf[offs]) {
 364         case '\\':
 365                 cp = buf + offs + 1;
 366                 mandoc_escape(&cp, NULL, NULL);
 367                 offs = cp - buf;
 368                 break;
 369         case '\t':
 370                 offs++;
 371                 break;
 372         default:
 373                 break;
 374         }
 375
 376         /* Jump to the next non-whitespace word. */
 377
 378         while (buf[offs] && ' ' == buf[offs])
 379                 offs++;
 380
 381         /*
 382          * Trailing whitespace.  Note that tabs are allowed to be passed
 383          * into the parser as "text", so we only warn about spaces here.
 384          */
 385
 386         if ('\0' == buf[offs] && ' ' == buf[offs - 1])
 387                 mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
 388                     ln, offs - 1, NULL);
 389
 390         /*
 391          * If an initial macro or a list invocation, divert directly
 392          * into macro processing.
 393          */
 394
 395         if (NULL == mdoc->last || MDOC_It == tok || MDOC_El == tok) {
 396                 mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
 397                 return 1;
 398         }
 399
 400         n = mdoc->last;
 401         assert(mdoc->last);
 402
 403         /*
 404          * If the first macro of a `Bl -column', open an `It' block
 405          * context around the parsed macro.
 406          */
 407
 408         if (n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
 409             n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) {
 410                 mdoc->flags |= MDOC_FREECOL;
 411                 mdoc_macro(mdoc, MDOC_It, ln, sv, &sv, buf);
 412                 return 1;
 413         }
 414
 415         /*
 416          * If we're following a block-level `It' within a `Bl -column'
 417          * context (perhaps opened in the above block or in ptext()),
 418          * then open an `It' block context around the parsed macro.
 419          */
 420
 421         if (n->tok == MDOC_It && n->type == ROFFT_BLOCK &&
 422             NULL != n->parent &&
 423             MDOC_Bl == n->parent->tok &&
 424             LIST_column == n->parent->norm->Bl.type) {
 425                 mdoc->flags |= MDOC_FREECOL;
 426                 mdoc_macro(mdoc, MDOC_It, ln, sv, &sv, buf);
 427                 return 1;
 428         }
 429
 430         /* Normal processing of a macro. */
 431
 432         mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
 433
 434         /* In quick mode (for mandocdb), abort after the NAME section. */
 435
 436         if (mdoc->quick && MDOC_Sh == tok &&
 437             SEC_NAME != mdoc->last->sec)
 438                 return 2;
 439
 440         return 1;
 441 }
 442
 443 enum mdelim
 444 mdoc_isdelim(const char *p)
 445 {
 446
 447         if ('\0' == p[0])
 448                 return DELIM_NONE;
 449
 450         if ('\0' == p[1])
 451                 switch (p[0]) {
 452                 case '(':
 453                 case '[':
 454                         return DELIM_OPEN;
 455                 case '|':
 456                         return DELIM_MIDDLE;
 457                 case '.':
 458                 case ',':
 459                 case ';':
 460                 case ':':
 461                 case '?':
 462                 case '!':
 463                 case ')':
 464                 case ']':
 465                         return DELIM_CLOSE;
 466                 default:
 467                         return DELIM_NONE;
 468                 }
 469
 470         if ('\\' != p[0])
 471                 return DELIM_NONE;
 472
 473         if (0 == strcmp(p + 1, "."))
 474                 return DELIM_CLOSE;
 475         if (0 == strcmp(p + 1, "fR|\\fP"))
 476                 return DELIM_MIDDLE;
 477
 478         return DELIM_NONE;
 479 }
 480
 481 void
 482 mdoc_validate(struct roff_man *mdoc)
 483 {
 484
 485         mdoc->last = mdoc->first;
 486         mdoc_node_validate(mdoc);
 487         mdoc_state_reset(mdoc);
 488 }