mdoc.c

   1 /*      $Id: mdoc.c,v 1.274 2018/12/31 07:46:07 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2010, 2012-2018 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_argnames[MDOC_ARG_MAX] = {
  39         "split",                "nosplit",              "ragged",
  40         "unfilled",             "literal",              "file",
  41         "offset",               "bullet",               "dash",
  42         "hyphen",               "item",                 "enum",
  43         "tag",                  "diag",                 "hang",
  44         "ohang",                "inset",                "column",
  45         "width",                "compact",              "std",
  46         "filled",               "words",                "emphasis",
  47         "symbolic",             "nested",               "centered"
  48 };
  49 const   char * const *mdoc_argnames = __mdoc_argnames;
  50
  51 static  int               mdoc_ptext(struct roff_man *, int, char *, int);
  52 static  int               mdoc_pmacro(struct roff_man *, int, char *, int);
  53
  54
  55 /*
  56  * Main parse routine.  Parses a single line -- really just hands off to
  57  * the macro (mdoc_pmacro()) or text parser (mdoc_ptext()).
  58  */
  59 int
  60 mdoc_parseln(struct roff_man *mdoc, int ln, char *buf, int offs)
  61 {
  62
  63         if (mdoc->last->type != ROFFT_EQN || ln > mdoc->last->line)
  64                 mdoc->flags |= MDOC_NEWLINE;
  65
  66         /*
  67          * Let the roff nS register switch SYNOPSIS mode early,
  68          * such that the parser knows at all times
  69          * whether this mode is on or off.
  70          * Note that this mode is also switched by the Sh macro.
  71          */
  72         if (roff_getreg(mdoc->roff, "nS"))
  73                 mdoc->flags |= MDOC_SYNOPSIS;
  74         else
  75                 mdoc->flags &= ~MDOC_SYNOPSIS;
  76
  77         return roff_getcontrol(mdoc->roff, buf, &offs) ?
  78             mdoc_pmacro(mdoc, ln, buf, offs) :
  79             mdoc_ptext(mdoc, ln, buf, offs);
  80 }
  81
  82 void
  83 mdoc_tail_alloc(struct roff_man *mdoc, int line, int pos, enum roff_tok tok)
  84 {
  85         struct roff_node *p;
  86
  87         p = roff_node_alloc(mdoc, line, pos, ROFFT_TAIL, tok);
  88         roff_node_append(mdoc, p);
  89         mdoc->next = ROFF_NEXT_CHILD;
  90 }
  91
  92 struct roff_node *
  93 mdoc_endbody_alloc(struct roff_man *mdoc, int line, int pos,
  94     enum roff_tok tok, struct roff_node *body)
  95 {
  96         struct roff_node *p;
  97
  98         body->flags |= NODE_ENDED;
  99         body->parent->flags |= NODE_ENDED;
 100         p = roff_node_alloc(mdoc, line, pos, ROFFT_BODY, tok);
 101         p->body = body;
 102         p->norm = body->norm;
 103         p->end = ENDBODY_SPACE;
 104         roff_node_append(mdoc, p);
 105         mdoc->next = ROFF_NEXT_SIBLING;
 106         return p;
 107 }
 108
 109 struct roff_node *
 110 mdoc_block_alloc(struct roff_man *mdoc, int line, int pos,
 111     enum roff_tok tok, struct mdoc_arg *args)
 112 {
 113         struct roff_node *p;
 114
 115         p = roff_node_alloc(mdoc, line, pos, ROFFT_BLOCK, tok);
 116         p->args = args;
 117         if (p->args)
 118                 (args->refcnt)++;
 119
 120         switch (tok) {
 121         case MDOC_Bd:
 122         case MDOC_Bf:
 123         case MDOC_Bl:
 124         case MDOC_En:
 125         case MDOC_Rs:
 126                 p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
 127                 break;
 128         default:
 129                 break;
 130         }
 131         roff_node_append(mdoc, p);
 132         mdoc->next = ROFF_NEXT_CHILD;
 133         return p;
 134 }
 135
 136 void
 137 mdoc_elem_alloc(struct roff_man *mdoc, int line, int pos,
 138      enum roff_tok tok, struct mdoc_arg *args)
 139 {
 140         struct roff_node *p;
 141
 142         p = roff_node_alloc(mdoc, line, pos, ROFFT_ELEM, tok);
 143         p->args = args;
 144         if (p->args)
 145                 (args->refcnt)++;
 146
 147         switch (tok) {
 148         case MDOC_An:
 149                 p->norm = mandoc_calloc(1, sizeof(union mdoc_data));
 150                 break;
 151         default:
 152                 break;
 153         }
 154         roff_node_append(mdoc, p);
 155         mdoc->next = ROFF_NEXT_CHILD;
 156 }
 157
 158 /*
 159  * Parse free-form text, that is, a line that does not begin with the
 160  * control character.
 161  */
 162 static int
 163 mdoc_ptext(struct roff_man *mdoc, int line, char *buf, int offs)
 164 {
 165         struct roff_node *n;
 166         const char       *cp, *sp;
 167         char             *c, *ws, *end;
 168
 169         n = mdoc->last;
 170
 171         /*
 172          * If a column list contains plain text, assume an implicit item
 173          * macro.  This can happen one or more times at the beginning
 174          * of such a list, intermixed with non-It mdoc macros and with
 175          * nodes generated on the roff level, for example by tbl.
 176          */
 177
 178         if ((n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
 179              n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) ||
 180             (n->parent != NULL && n->parent->tok == MDOC_Bl &&
 181              n->parent->norm->Bl.type == LIST_column)) {
 182                 mdoc->flags |= MDOC_FREECOL;
 183                 (*mdoc_macro(MDOC_It)->fp)(mdoc, MDOC_It,
 184                     line, offs, &offs, buf);
 185                 return 1;
 186         }
 187
 188         /*
 189          * Search for the beginning of unescaped trailing whitespace (ws)
 190          * and for the first character not to be output (end).
 191          */
 192
 193         /* FIXME: replace with strcspn(). */
 194         ws = NULL;
 195         for (c = end = buf + offs; *c; c++) {
 196                 switch (*c) {
 197                 case ' ':
 198                         if (NULL == ws)
 199                                 ws = c;
 200                         continue;
 201                 case '\t':
 202                         /*
 203                          * Always warn about trailing tabs,
 204                          * even outside literal context,
 205                          * where they should be put on the next line.
 206                          */
 207                         if (NULL == ws)
 208                                 ws = c;
 209                         /*
 210                          * Strip trailing tabs in literal context only;
 211                          * outside, they affect the next line.
 212                          */
 213                         if (mdoc->flags & ROFF_NOFILL)
 214                                 continue;
 215                         break;
 216                 case '\\':
 217                         /* Skip the escaped character, too, if any. */
 218                         if (c[1])
 219                                 c++;
 220                         /* FALLTHROUGH */
 221                 default:
 222                         ws = NULL;
 223                         break;
 224                 }
 225                 end = c + 1;
 226         }
 227         *end = '\0';
 228
 229         if (ws)
 230                 mandoc_msg(MANDOCERR_SPACE_EOL, line, (int)(ws - buf), NULL);
 231
 232         /*
 233          * Blank lines are allowed in no-fill mode
 234          * and cancel preceding \c,
 235          * but add a single vertical space elsewhere.
 236          */
 237
 238         if (buf[offs] == '\0' && (mdoc->flags & ROFF_NOFILL) == 0) {
 239                 switch (mdoc->last->type) {
 240                 case ROFFT_TEXT:
 241                         sp = mdoc->last->string;
 242                         cp = end = strchr(sp, '\0') - 2;
 243                         if (cp < sp || cp[0] != '\\' || cp[1] != 'c')
 244                                 break;
 245                         while (cp > sp && cp[-1] == '\\')
 246                                 cp--;
 247                         if ((end - cp) % 2)
 248                                 break;
 249                         *end = '\0';
 250                         return 1;
 251                 default:
 252                         break;
 253                 }
 254                 mandoc_msg(MANDOCERR_FI_BLANK, line, (int)(c - buf), NULL);
 255                 roff_elem_alloc(mdoc, line, offs, ROFF_sp);
 256                 mdoc->last->flags |= NODE_VALID | NODE_ENDED;
 257                 mdoc->next = ROFF_NEXT_SIBLING;
 258                 return 1;
 259         }
 260
 261         roff_word_alloc(mdoc, line, offs, buf+offs);
 262
 263         if (mdoc->flags & ROFF_NOFILL)
 264                 return 1;
 265
 266         /*
 267          * End-of-sentence check.  If the last character is an unescaped
 268          * EOS character, then flag the node as being the end of a
 269          * sentence.  The front-end will know how to interpret this.
 270          */
 271
 272         assert(buf < end);
 273
 274         if (mandoc_eos(buf+offs, (size_t)(end-buf-offs)))
 275                 mdoc->last->flags |= NODE_EOS;
 276
 277         for (c = buf + offs; c != NULL; c = strchr(c + 1, '.')) {
 278                 if (c - buf < offs + 2)
 279                         continue;
 280                 if (end - c < 3)
 281                         break;
 282                 if (c[1] != ' ' ||
 283                     isalnum((unsigned char)c[-2]) == 0 ||
 284                     isalnum((unsigned char)c[-1]) == 0 ||
 285                     (c[-2] == 'n' && c[-1] == 'c') ||
 286                     (c[-2] == 'v' && c[-1] == 's'))
 287                         continue;
 288                 c += 2;
 289                 if (*c == ' ')
 290                         c++;
 291                 if (*c == ' ')
 292                         c++;
 293                 if (isupper((unsigned char)(*c)))
 294                         mandoc_msg(MANDOCERR_EOS, line, (int)(c - buf), NULL);
 295         }
 296
 297         return 1;
 298 }
 299
 300 /*
 301  * Parse a macro line, that is, a line beginning with the control
 302  * character.
 303  */
 304 static int
 305 mdoc_pmacro(struct roff_man *mdoc, int ln, char *buf, int offs)
 306 {
 307         struct roff_node *n;
 308         const char       *cp;
 309         size_t            sz;
 310         enum roff_tok     tok;
 311         int               sv;
 312
 313         /* Determine the line macro. */
 314
 315         sv = offs;
 316         tok = TOKEN_NONE;
 317         for (sz = 0; sz < 4 && strchr(" \t\\", buf[offs]) == NULL; sz++)
 318                 offs++;
 319         if (sz == 2 || sz == 3)
 320                 tok = roffhash_find(mdoc->mdocmac, buf + sv, sz);
 321         if (tok == TOKEN_NONE) {
 322                 mandoc_msg(MANDOCERR_MACRO, ln, sv, "%s", buf + sv - 1);
 323                 return 1;
 324         }
 325
 326         /* Skip a leading escape sequence or tab. */
 327
 328         switch (buf[offs]) {
 329         case '\\':
 330                 cp = buf + offs + 1;
 331                 mandoc_escape(&cp, NULL, NULL);
 332                 offs = cp - buf;
 333                 break;
 334         case '\t':
 335                 offs++;
 336                 break;
 337         default:
 338                 break;
 339         }
 340
 341         /* Jump to the next non-whitespace word. */
 342
 343         while (buf[offs] == ' ')
 344                 offs++;
 345
 346         /*
 347          * Trailing whitespace.  Note that tabs are allowed to be passed
 348          * into the parser as "text", so we only warn about spaces here.
 349          */
 350
 351         if ('\0' == buf[offs] && ' ' == buf[offs - 1])
 352                 mandoc_msg(MANDOCERR_SPACE_EOL, ln, offs - 1, NULL);
 353
 354         /*
 355          * If an initial macro or a list invocation, divert directly
 356          * into macro processing.
 357          */
 358
 359         n = mdoc->last;
 360         if (n == NULL || tok == MDOC_It || tok == MDOC_El) {
 361                 (*mdoc_macro(tok)->fp)(mdoc, tok, ln, sv, &offs, buf);
 362                 return 1;
 363         }
 364
 365         /*
 366          * If a column list contains a non-It macro, assume an implicit
 367          * item macro.  This can happen one or more times at the
 368          * beginning of such a list, intermixed with text lines and
 369          * with nodes generated on the roff level, for example by tbl.
 370          */
 371
 372         if ((n->tok == MDOC_Bl && n->type == ROFFT_BODY &&
 373              n->end == ENDBODY_NOT && n->norm->Bl.type == LIST_column) ||
 374             (n->parent != NULL && n->parent->tok == MDOC_Bl &&
 375              n->parent->norm->Bl.type == LIST_column)) {
 376                 mdoc->flags |= MDOC_FREECOL;
 377                 (*mdoc_macro(MDOC_It)->fp)(mdoc, MDOC_It, ln, sv, &sv, buf);
 378                 return 1;
 379         }
 380
 381         /* Normal processing of a macro. */
 382
 383         (*mdoc_macro(tok)->fp)(mdoc, tok, ln, sv, &offs, buf);
 384
 385         /* In quick mode (for mandocdb), abort after the NAME section. */
 386
 387         if (mdoc->quick && MDOC_Sh == tok &&
 388             SEC_NAME != mdoc->last->sec)
 389                 return 2;
 390
 391         return 1;
 392 }
 393
 394 enum mdelim
 395 mdoc_isdelim(const char *p)
 396 {
 397
 398         if ('\0' == p[0])
 399                 return DELIM_NONE;
 400
 401         if ('\0' == p[1])
 402                 switch (p[0]) {
 403                 case '(':
 404                 case '[':
 405                         return DELIM_OPEN;
 406                 case '|':
 407                         return DELIM_MIDDLE;
 408                 case '.':
 409                 case ',':
 410                 case ';':
 411                 case ':':
 412                 case '?':
 413                 case '!':
 414                 case ')':
 415                 case ']':
 416                         return DELIM_CLOSE;
 417                 default:
 418                         return DELIM_NONE;
 419                 }
 420
 421         if ('\\' != p[0])
 422                 return DELIM_NONE;
 423
 424         if (0 == strcmp(p + 1, "."))
 425                 return DELIM_CLOSE;
 426         if (0 == strcmp(p + 1, "fR|\\fP"))
 427                 return DELIM_MIDDLE;
 428
 429         return DELIM_NONE;
 430 }