contrib/mdocml/mdoc.c

   1 /* $Id: mdoc.c,v 1.275 2020/04/06 10:16:17 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2010, 2012-2018, 2020 Ingo Schwarze <schwarze@openbsd.org>
   4  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   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  * Top level and utility functions of the mdoc(7) parser for mandoc(1).
  19  */
  20 #include "config.h"
  21
  22 #include <sys/types.h>
  23
  24 #include <assert.h>
  25 #include <ctype.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <time.h>
  31
  32 #include "mandoc_aux.h"
  33 #include "mandoc.h"
  34 #include "roff.h"
  35 #include "mdoc.h"
  36 #include "libmandoc.h"
  37 #include "roff_int.h"
  38 #include "libmdoc.h"
  39
  40 const   char *const __mdoc_argnames[MDOC_ARG_MAX] = {
  41         "split",                "nosplit",              "ragged",
  42         "unfilled",             "literal",              "file",
  43         "offset",               "bullet",               "dash",
  44         "hyphen",               "item",                 "enum",
  45         "tag",                  "diag",                 "hang",
  46         "ohang",                "inset",                "column",
  47         "width",                "compact",              "std",
  48         "filled",               "words",                "emphasis",
  49         "symbolic",             "nested",               "centered"
  50 };
  51 const   char * const *mdoc_argnames = __mdoc_argnames;
  52
  53 static  int               mdoc_ptext(struct roff_man *, int, char *, int);
  54 static  int               mdoc_pmacro(struct roff_man *, int, char *, int);
  55
  56
  57 /*
  58  * Main parse routine.  Parses a single line -- really just hands off to
  59  * the macro (mdoc_pmacro()) or text parser (mdoc_ptext()).
  60  */
  61 int
  62 mdoc_parseln(struct roff_man *mdoc, int ln, char *buf, int offs)
  63 {
  64
  65         if (mdoc->last->type != ROFFT_EQN || ln > mdoc->last->line)
  66                 mdoc->flags |= MDOC_NEWLINE;
  67
  68         /*
  69          * Let the roff nS register switch SYNOPSIS mode early,
  70          * such that the parser knows at all times
  71          * whether this mode is on or off.
  72          * Note that this mode is also switched by the Sh macro.
  73          */
  74         if (roff_getreg(mdoc->roff, "nS"))
  75                 mdoc->flags |= MDOC_SYNOPSIS;
  76         else
  77                 mdoc->flags &= ~MDOC_SYNOPSIS;
  78
  79         return roff_getcontrol(mdoc->roff, buf, &offs) ?
  80             mdoc_pmacro(mdoc, ln, buf, offs) :
  81             mdoc_ptext(mdoc, ln, buf, offs);
  82 }
  83
  84 void
  85 mdoc_tail_alloc(struct roff_man *mdoc, int line, int pos, enum roff_tok tok)
  86 {
  87         struct roff_node *p;
  88
  89         p = roff_node_alloc(mdoc, line, pos, ROFFT_TAIL, tok);
  90         roff_node_append(mdoc, p);
  91         mdoc->next = ROFF_NEXT_CHILD;
  92 }
  93
  94 struct roff_node *
  95 mdoc_endbody_alloc(struct roff_man *mdoc, int line, int pos,
  96     enum roff_tok tok, struct roff_node *body)
  97 {
  98         struct roff_node *p;
  99
 100         body->flags |= NODE_ENDED;
 101         body->parent->flags |= NODE_ENDED;
 102         p = roff_node_alloc(mdoc, line, pos, ROFFT_BODY, tok);
 103         p->body = body;
 104         p->norm = body->norm;
 105         p->end = ENDBODY_SPACE;
 106         roff_node_append(mdoc, p);
 107         mdoc->next = ROFF_NEXT_SIBLING;
 108         return p;
 109 }
 110
 111 struct roff_node *
 112 mdoc_block_alloc(struct roff_man *mdoc, int line, int pos,
 113     enum roff_tok tok, struct mdoc_arg *args)
 114 {
 115         struct roff_node *p;
 116
 117         p = roff_node_alloc(mdoc, line, pos, ROFFT_BLOCK, tok);
 118         p->args = args;
 119         if (p->args)
 120                 (args->refcnt)++;
 121
 122         switch (tok) {
 123         case MDOC_Bd:
 124         case MDOC_Bf:
 125         case MDOC_Bl:
 126         case MDOC_En:
 127         case MDOC_Rs:
 128                 p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
 129                 break;
 130         default:
 131                 break;
 132         }
 133         roff_node_append(mdoc, p);
 134         mdoc->next = ROFF_NEXT_CHILD;
 135         return p;
 136 }
 137
 138 void
 139 mdoc_elem_alloc(struct roff_man *mdoc, int line, int pos,
 140      enum roff_tok tok, struct mdoc_arg *args)
 141 {
 142         struct roff_node *p;
 143
 144         p = roff_node_alloc(mdoc, line, pos, ROFFT_ELEM, tok);
 145         p->args = args;
 146         if (p->args)
 147                 (args->refcnt)++;
 148
 149         switch (tok) {
 150         case MDOC_An:
 151                 p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
 152                 break;
 153         default:
 154                 break;
 155         }
 156         roff_node_append(mdoc, p);
 157         mdoc->next = ROFF_NEXT_CHILD;
 158 }
 159
 160 /*
 161  * Parse free-form text, that is, a line that does not begin with the
 162  * control character.
 163  */
 164 static int
 165 mdoc_ptext(struct roff_man *mdoc, int line, char *buf, int offs)
 166 {
 167         struct roff_node *n;
 168         const char       *cp, *sp;
 169         char             *c, *ws, *end;
 170
 171         n = mdoc->last;
 172
 173         /*
 174          * If a column list contains plain text, assume an implicit item
 175          * macro.  This can happen one or more times at the beginning
 176          * of such a list, intermixed with non-It mdoc macros and with
 177          * nodes generated on the roff level, for example by tbl.
 178          */
 179
 180         if ((n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
 181              n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) ||
 182             (n->parent != NULL && n->parent->tok == MDOC_Bl &&
 183              n->parent->norm->Bl.type == LIST_column)) {
 184                 mdoc->flags |= MDOC_FREECOL;
 185                 (*mdoc_macro(MDOC_It)->fp)(mdoc, MDOC_It,
 186                     line, offs, &offs, buf);
 187                 return 1;
 188         }
 189
 190         /*
 191          * Search for the beginning of unescaped trailing whitespace (ws)
 192          * and for the first character not to be output (end).
 193          */
 194
 195         /* FIXME: replace with strcspn(). */
 196         ws = NULL;
 197         for (c = end = buf + offs; *c; c++) {
 198                 switch (*c) {
 199                 case ' ':
 200                         if (NULL == ws)
 201                                 ws = c;
 202                         continue;
 203                 case '\t':
 204                         /*
 205                          * Always warn about trailing tabs,
 206                          * even outside literal context,
 207                          * where they should be put on the next line.
 208                          */
 209                         if (NULL == ws)
 210                                 ws = c;
 211                         /*
 212                          * Strip trailing tabs in literal context only;
 213                          * outside, they affect the next line.
 214                          */
 215                         if (mdoc->flags & ROFF_NOFILL)
 216                                 continue;
 217                         break;
 218                 case '\\':
 219                         /* Skip the escaped character, too, if any. */
 220                         if (c[1])
 221                                 c++;
 222                         /* FALLTHROUGH */
 223                 default:
 224                         ws = NULL;
 225                         break;
 226                 }
 227                 end = c + 1;
 228         }
 229         *end = '\0';
 230
 231         if (ws)
 232                 mandoc_msg(MANDOCERR_SPACE_EOL, line, (int)(ws - buf), NULL);
 233
 234         /*
 235          * Blank lines are allowed in no-fill mode
 236          * and cancel preceding \c,
 237          * but add a single vertical space elsewhere.
 238          */
 239
 240         if (buf[offs] == '\0' && (mdoc->flags & ROFF_NOFILL) == 0) {
 241                 switch (mdoc->last->type) {
 242                 case ROFFT_TEXT:
 243                         sp = mdoc->last->string;
 244                         cp = end = strchr(sp, '\0') - 2;
 245                         if (cp < sp || cp[0] != '\\' || cp[1] != 'c')
 246                                 break;
 247                         while (cp > sp && cp[-1] == '\\')
 248                                 cp--;
 249                         if ((end - cp) % 2)
 250                                 break;
 251                         *end = '\0';
 252                         return 1;
 253                 default:
 254                         break;
 255                 }
 256                 mandoc_msg(MANDOCERR_FI_BLANK, line, (int)(c - buf), NULL);
 257                 roff_elem_alloc(mdoc, line, offs, ROFF_sp);
 258                 mdoc->last->flags |= NODE_VALID | NODE_ENDED;
 259                 mdoc->next = ROFF_NEXT_SIBLING;
 260                 return 1;
 261         }
 262
 263         roff_word_alloc(mdoc, line, offs, buf+offs);
 264
 265         if (mdoc->flags & ROFF_NOFILL)
 266                 return 1;
 267
 268         /*
 269          * End-of-sentence check.  If the last character is an unescaped
 270          * EOS character, then flag the node as being the end of a
 271          * sentence.  The front-end will know how to interpret this.
 272          */
 273
 274         assert(buf < end);
 275
 276         if (mandoc_eos(buf+offs, (size_t)(end-buf-offs)))
 277                 mdoc->last->flags |= NODE_EOS;
 278
 279         for (c = buf + offs; c != NULL; c = strchr(c + 1, '.')) {
 280                 if (c - buf < offs + 2)
 281                         continue;
 282                 if (end - c < 3)
 283                         break;
 284                 if (c[1] != ' ' ||
 285                     isalnum((unsigned char)c[-2]) == 0 ||
 286                     isalnum((unsigned char)c[-1]) == 0 ||
 287                     (c[-2] == 'n' && c[-1] == 'c') ||
 288                     (c[-2] == 'v' && c[-1] == 's'))
 289                         continue;
 290                 c += 2;
 291                 if (*c == ' ')
 292                         c++;
 293                 if (*c == ' ')
 294                         c++;
 295                 if (isupper((unsigned char)(*c)))
 296                         mandoc_msg(MANDOCERR_EOS, line, (int)(c - buf), NULL);
 297         }
 298
 299         return 1;
 300 }
 301
 302 /*
 303  * Parse a macro line, that is, a line beginning with the control
 304  * character.
 305  */
 306 static int
 307 mdoc_pmacro(struct roff_man *mdoc, int ln, char *buf, int offs)
 308 {
 309         struct roff_node *n;
 310         const char       *cp;
 311         size_t            sz;
 312         enum roff_tok     tok;
 313         int               sv;
 314
 315         /* Determine the line macro. */
 316
 317         sv = offs;
 318         tok = TOKEN_NONE;
 319         for (sz = 0; sz < 4 && strchr(" \t\\", buf[offs]) == NULL; sz++)
 320                 offs++;
 321         if (sz == 2 || sz == 3)
 322                 tok = roffhash_find(mdoc->mdocmac, buf + sv, sz);
 323         if (tok == TOKEN_NONE) {
 324                 mandoc_msg(MANDOCERR_MACRO, ln, sv, "%s", buf + sv - 1);
 325                 return 1;
 326         }
 327
 328         /* Skip a leading escape sequence or tab. */
 329
 330         switch (buf[offs]) {
 331         case '\\':
 332                 cp = buf + offs + 1;
 333                 mandoc_escape(&cp, NULL, NULL);
 334                 offs = cp - buf;
 335                 break;
 336         case '\t':
 337                 offs++;
 338                 break;
 339         default:
 340                 break;
 341         }
 342
 343         /* Jump to the next non-whitespace word. */
 344
 345         while (buf[offs] == ' ')
 346                 offs++;
 347
 348         /*
 349          * Trailing whitespace.  Note that tabs are allowed to be passed
 350          * into the parser as "text", so we only warn about spaces here.
 351          */
 352
 353         if ('\0' == buf[offs] && ' ' == buf[offs - 1])
 354                 mandoc_msg(MANDOCERR_SPACE_EOL, ln, offs - 1, NULL);
 355
 356         /*
 357          * If an initial or transparent macro or a list invocation,
 358          * divert directly into macro processing.
 359          */
 360
 361         n = mdoc->last;
 362         if (n == NULL || tok == MDOC_It || tok == MDOC_El ||
 363             roff_tok_transparent(tok)) {
 364                 (*mdoc_macro(tok)->fp)(mdoc, tok, ln, sv, &offs, buf);
 365                 return 1;
 366         }
 367
 368         /*
 369          * If a column list contains a non-It macro, assume an implicit
 370          * item macro.  This can happen one or more times at the
 371          * beginning of such a list, intermixed with text lines and
 372          * with nodes generated on the roff level, for example by tbl.
 373          */
 374
 375         if ((n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
 376              n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) ||
 377             (n->parent != NULL && n->parent->tok == MDOC_Bl &&
 378              n->parent->norm->Bl.type == LIST_column)) {
 379                 mdoc->flags |= MDOC_FREECOL;
 380                 (*mdoc_macro(MDOC_It)->fp)(mdoc, MDOC_It, ln, sv, &sv, buf);
 381                 return 1;
 382         }
 383
 384         /* Normal processing of a macro. */
 385
 386         (*mdoc_macro(tok)->fp)(mdoc, tok, ln, sv, &offs, buf);
 387
 388         /* In quick mode (for mandocdb), abort after the NAME section. */
 389
 390         if (mdoc->quick && MDOC_Sh == tok &&
 391             SEC_NAME != mdoc->last->sec)
 392                 return 2;
 393
 394         return 1;
 395 }
 396
 397 enum mdelim
 398 mdoc_isdelim(const char *p)
 399 {
 400
 401         if ('\0' == p[0])
 402                 return DELIM_NONE;
 403
 404         if ('\0' == p[1])
 405                 switch (p[0]) {
 406                 case '(':
 407                 case '[':
 408                         return DELIM_OPEN;
 409                 case '|':
 410                         return DELIM_MIDDLE;
 411                 case '.':
 412                 case ',':
 413                 case ';':
 414                 case ':':
 415                 case '?':
 416                 case '!':
 417                 case ')':
 418                 case ']':
 419                         return DELIM_CLOSE;
 420                 default:
 421                         return DELIM_NONE;
 422                 }
 423
 424         if ('\\' != p[0])
 425                 return DELIM_NONE;
 426
 427         if (0 == strcmp(p + 1, "."))
 428                 return DELIM_CLOSE;
 429         if (0 == strcmp(p + 1, "fR|\\fP"))
 430                 return DELIM_MIDDLE;
 431
 432         return DELIM_NONE;
 433 }