external/bsd/mdocml/dist/man.c

   1 /*      $Vendor-Id: man.c,v 1.96 2011/01/03 11:31:26 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
   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 above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #include <sys/types.h>
  22
  23 #include <assert.h>
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "mandoc.h"
  30 #include "libman.h"
  31 #include "libmandoc.h"
  32
  33 const   char *const __man_macronames[MAN_MAX] = {
  34         "br",           "TH",           "SH",           "SS",
  35         "TP",           "LP",           "PP",           "P",
  36         "IP",           "HP",           "SM",           "SB",
  37         "BI",           "IB",           "BR",           "RB",
  38         "R",            "B",            "I",            "IR",
  39         "RI",           "na",           "sp",           "nf",
  40         "fi",           "RE",           "RS",           "DT",
  41         "UC",           "PD",           "AT",           "in",
  42         "ft"
  43         };
  44
  45 const   char * const *man_macronames = __man_macronames;
  46
  47 static  struct man_node *man_node_alloc(int, int,
  48                                 enum man_type, enum mant);
  49 static  int              man_node_append(struct man *,
  50                                 struct man_node *);
  51 static  int              man_span_alloc(struct man *,
  52                                 const struct tbl_span *);
  53 static  void             man_node_free(struct man_node *);
  54 static  void             man_node_unlink(struct man *,
  55                                 struct man_node *);
  56 static  int              man_ptext(struct man *, int, char *, int);
  57 static  int              man_pmacro(struct man *, int, char *, int);
  58 static  void             man_free1(struct man *);
  59 static  void             man_alloc1(struct man *);
  60 static  int              man_descope(struct man *, int, int);
  61
  62
  63 const struct man_node *
  64 man_node(const struct man *m)
  65 {
  66
  67         assert( ! (MAN_HALT & m->flags));
  68         return(m->first);
  69 }
  70
  71
  72 const struct man_meta *
  73 man_meta(const struct man *m)
  74 {
  75
  76         assert( ! (MAN_HALT & m->flags));
  77         return(&m->meta);
  78 }
  79
  80
  81 void
  82 man_reset(struct man *man)
  83 {
  84
  85         man_free1(man);
  86         man_alloc1(man);
  87 }
  88
  89
  90 void
  91 man_free(struct man *man)
  92 {
  93
  94         man_free1(man);
  95         free(man);
  96 }
  97
  98
  99 struct man *
 100 man_alloc(struct regset *regs, void *data, mandocmsg msg)
 101 {
 102         struct man      *p;
 103
 104         p = mandoc_calloc(1, sizeof(struct man));
 105
 106         man_hash_init();
 107         p->data = data;
 108         p->msg = msg;
 109         p->regs = regs;
 110
 111         man_alloc1(p);
 112         return(p);
 113 }
 114
 115
 116 int
 117 man_endparse(struct man *m)
 118 {
 119
 120         assert( ! (MAN_HALT & m->flags));
 121         if (man_macroend(m))
 122                 return(1);
 123         m->flags |= MAN_HALT;
 124         return(0);
 125 }
 126
 127
 128 int
 129 man_parseln(struct man *m, int ln, char *buf, int offs)
 130 {
 131
 132         assert( ! (MAN_HALT & m->flags));
 133         return(('.' == buf[offs] || '\'' == buf[offs]) ?
 134                         man_pmacro(m, ln, buf, offs) :
 135                         man_ptext(m, ln, buf, offs));
 136 }
 137
 138
 139 static void
 140 man_free1(struct man *man)
 141 {
 142
 143         if (man->first)
 144                 man_node_delete(man, man->first);
 145         if (man->meta.title)
 146                 free(man->meta.title);
 147         if (man->meta.source)
 148                 free(man->meta.source);
 149         if (man->meta.rawdate)
 150                 free(man->meta.rawdate);
 151         if (man->meta.vol)
 152                 free(man->meta.vol);
 153         if (man->meta.msec)
 154                 free(man->meta.msec);
 155 }
 156
 157
 158 static void
 159 man_alloc1(struct man *m)
 160 {
 161
 162         memset(&m->meta, 0, sizeof(struct man_meta));
 163         m->flags = 0;
 164         m->last = mandoc_calloc(1, sizeof(struct man_node));
 165         m->first = m->last;
 166         m->last->type = MAN_ROOT;
 167         m->last->tok = MAN_MAX;
 168         m->next = MAN_NEXT_CHILD;
 169 }
 170
 171
 172 static int
 173 man_node_append(struct man *man, struct man_node *p)
 174 {
 175
 176         assert(man->last);
 177         assert(man->first);
 178         assert(MAN_ROOT != p->type);
 179
 180         switch (man->next) {
 181         case (MAN_NEXT_SIBLING):
 182                 man->last->next = p;
 183                 p->prev = man->last;
 184                 p->parent = man->last->parent;
 185                 break;
 186         case (MAN_NEXT_CHILD):
 187                 man->last->child = p;
 188                 p->parent = man->last;
 189                 break;
 190         default:
 191                 abort();
 192                 /* NOTREACHED */
 193         }
 194
 195         assert(p->parent);
 196         p->parent->nchild++;
 197
 198         if ( ! man_valid_pre(man, p))
 199                 return(0);
 200
 201         switch (p->type) {
 202         case (MAN_HEAD):
 203                 assert(MAN_BLOCK == p->parent->type);
 204                 p->parent->head = p;
 205                 break;
 206         case (MAN_BODY):
 207                 assert(MAN_BLOCK == p->parent->type);
 208                 p->parent->body = p;
 209                 break;
 210         default:
 211                 break;
 212         }
 213
 214         man->last = p;
 215
 216         switch (p->type) {
 217         case (MAN_TBL):
 218                 /* FALLTHROUGH */
 219         case (MAN_TEXT):
 220                 if ( ! man_valid_post(man))
 221                         return(0);
 222                 break;
 223         default:
 224                 break;
 225         }
 226
 227         return(1);
 228 }
 229
 230
 231 static struct man_node *
 232 man_node_alloc(int line, int pos, enum man_type type, enum mant tok)
 233 {
 234         struct man_node *p;
 235
 236         p = mandoc_calloc(1, sizeof(struct man_node));
 237         p->line = line;
 238         p->pos = pos;
 239         p->type = type;
 240         p->tok = tok;
 241         return(p);
 242 }
 243
 244
 245 int
 246 man_elem_alloc(struct man *m, int line, int pos, enum mant tok)
 247 {
 248         struct man_node *p;
 249
 250         p = man_node_alloc(line, pos, MAN_ELEM, tok);
 251         if ( ! man_node_append(m, p))
 252                 return(0);
 253         m->next = MAN_NEXT_CHILD;
 254         return(1);
 255 }
 256
 257
 258 int
 259 man_head_alloc(struct man *m, int line, int pos, enum mant tok)
 260 {
 261         struct man_node *p;
 262
 263         p = man_node_alloc(line, pos, MAN_HEAD, tok);
 264         if ( ! man_node_append(m, p))
 265                 return(0);
 266         m->next = MAN_NEXT_CHILD;
 267         return(1);
 268 }
 269
 270
 271 int
 272 man_body_alloc(struct man *m, int line, int pos, enum mant tok)
 273 {
 274         struct man_node *p;
 275
 276         p = man_node_alloc(line, pos, MAN_BODY, tok);
 277         if ( ! man_node_append(m, p))
 278                 return(0);
 279         m->next = MAN_NEXT_CHILD;
 280         return(1);
 281 }
 282
 283
 284 int
 285 man_block_alloc(struct man *m, int line, int pos, enum mant tok)
 286 {
 287         struct man_node *p;
 288
 289         p = man_node_alloc(line, pos, MAN_BLOCK, tok);
 290         if ( ! man_node_append(m, p))
 291                 return(0);
 292         m->next = MAN_NEXT_CHILD;
 293         return(1);
 294 }
 295
 296 static int
 297 man_span_alloc(struct man *m, const struct tbl_span *span)
 298 {
 299         struct man_node *n;
 300
 301         /* FIXME: grab from span */
 302         n = man_node_alloc(0, 0, MAN_TBL, MAN_MAX);
 303         n->span = span;
 304
 305         if ( ! man_node_append(m, n))
 306                 return(0);
 307
 308         m->next = MAN_NEXT_SIBLING;
 309         return(1);
 310 }
 311
 312 int
 313 man_word_alloc(struct man *m, int line, int pos, const char *word)
 314 {
 315         struct man_node *n;
 316         size_t           sv, len;
 317
 318         len = strlen(word);
 319
 320         n = man_node_alloc(line, pos, MAN_TEXT, MAN_MAX);
 321         n->string = mandoc_malloc(len + 1);
 322         sv = strlcpy(n->string, word, len + 1);
 323
 324         /* Prohibit truncation. */
 325         assert(sv < len + 1);
 326
 327         if ( ! man_node_append(m, n))
 328                 return(0);
 329
 330         m->next = MAN_NEXT_SIBLING;
 331         return(1);
 332 }
 333
 334
 335 /*
 336  * Free all of the resources held by a node.  This does NOT unlink a
 337  * node from its context; for that, see man_node_unlink().
 338  */
 339 static void
 340 man_node_free(struct man_node *p)
 341 {
 342
 343         if (p->string)
 344                 free(p->string);
 345         free(p);
 346 }
 347
 348
 349 void
 350 man_node_delete(struct man *m, struct man_node *p)
 351 {
 352
 353         while (p->child)
 354                 man_node_delete(m, p->child);
 355
 356         man_node_unlink(m, p);
 357         man_node_free(p);
 358 }
 359
 360
 361 int
 362 man_addspan(struct man *m, const struct tbl_span *sp)
 363 {
 364
 365         assert( ! (MAN_HALT & m->flags));
 366         if ( ! man_span_alloc(m, sp))
 367                 return(0);
 368         return(man_descope(m, 0, 0));
 369 }
 370
 371 static int
 372 man_descope(struct man *m, int line, int offs)
 373 {
 374         /*
 375          * Co-ordinate what happens with having a next-line scope open:
 376          * first close out the element scope (if applicable), then close
 377          * out the block scope (also if applicable).
 378          */
 379
 380         if (MAN_ELINE & m->flags) {
 381                 m->flags &= ~MAN_ELINE;
 382                 if ( ! man_unscope(m, m->last->parent, MANDOCERR_MAX))
 383                         return(0);
 384         }
 385
 386         if ( ! (MAN_BLINE & m->flags))
 387                 return(1);
 388         m->flags &= ~MAN_BLINE;
 389
 390         if ( ! man_unscope(m, m->last->parent, MANDOCERR_MAX))
 391                 return(0);
 392         return(man_body_alloc(m, line, offs, m->last->tok));
 393 }
 394
 395
 396 static int
 397 man_ptext(struct man *m, int line, char *buf, int offs)
 398 {
 399         int              i;
 400
 401         /* Ignore bogus comments. */
 402
 403         if ('\\' == buf[offs] &&
 404                         '.' == buf[offs + 1] &&
 405                         '"' == buf[offs + 2]) {
 406                 man_pmsg(m, line, offs, MANDOCERR_BADCOMMENT);
 407                 return(1);
 408         }
 409
 410         /* Literal free-form text whitespace is preserved. */
 411
 412         if (MAN_LITERAL & m->flags) {
 413                 if ( ! man_word_alloc(m, line, offs, buf + offs))
 414                         return(0);
 415                 return(man_descope(m, line, offs));
 416         }
 417
 418         /* Pump blank lines directly into the backend. */
 419
 420         for (i = offs; ' ' == buf[i]; i++)
 421                 /* Skip leading whitespace. */ ;
 422
 423         if ('\0' == buf[i]) {
 424                 /* Allocate a blank entry. */
 425                 if ( ! man_word_alloc(m, line, offs, ""))
 426                         return(0);
 427                 return(man_descope(m, line, offs));
 428         }
 429
 430         /*
 431          * Warn if the last un-escaped character is whitespace. Then
 432          * strip away the remaining spaces (tabs stay!).
 433          */
 434
 435         i = (int)strlen(buf);
 436         assert(i);
 437
 438         if (' ' == buf[i - 1] || '\t' == buf[i - 1]) {
 439                 if (i > 1 && '\\' != buf[i - 2])
 440                         man_pmsg(m, line, i - 1, MANDOCERR_EOLNSPACE);
 441
 442                 for (--i; i && ' ' == buf[i]; i--)
 443                         /* Spin back to non-space. */ ;
 444
 445                 /* Jump ahead of escaped whitespace. */
 446                 i += '\\' == buf[i] ? 2 : 1;
 447
 448                 buf[i] = '\0';
 449         }
 450
 451         if ( ! man_word_alloc(m, line, offs, buf + offs))
 452                 return(0);
 453
 454         /*
 455          * End-of-sentence check.  If the last character is an unescaped
 456          * EOS character, then flag the node as being the end of a
 457          * sentence.  The front-end will know how to interpret this.
 458          */
 459
 460         assert(i);
 461         if (mandoc_eos(buf, (size_t)i, 0))
 462                 m->last->flags |= MAN_EOS;
 463
 464         return(man_descope(m, line, offs));
 465 }
 466
 467
 468 static int
 469 man_pmacro(struct man *m, int ln, char *buf, int offs)
 470 {
 471         int              i, j, ppos;
 472         enum mant        tok;
 473         char             mac[5];
 474         struct man_node *n;
 475
 476         /* Comments and empties are quickly ignored. */
 477
 478         offs++;
 479
 480         if ('\0' == buf[offs])
 481                 return(1);
 482
 483         i = offs;
 484
 485         /*
 486          * Skip whitespace between the control character and initial
 487          * text.  "Whitespace" is both spaces and tabs.
 488          */
 489
 490         if (' ' == buf[i] || '\t' == buf[i]) {
 491                 i++;
 492                 while (buf[i] && (' ' == buf[i] || '\t' == buf[i]))
 493                         i++;
 494                 if ('\0' == buf[i])
 495                         goto out;
 496         }
 497
 498         ppos = i;
 499
 500         /*
 501          * Copy the first word into a nil-terminated buffer.
 502          * Stop copying when a tab, space, or eoln is encountered.
 503          */
 504
 505         j = 0;
 506         while (j < 4 && '\0' != buf[i] && ' ' != buf[i] && '\t' != buf[i])
 507                 mac[j++] = buf[i++];
 508         mac[j] = '\0';
 509
 510         tok = (j > 0 && j < 4) ? man_hash_find(mac) : MAN_MAX;
 511         if (MAN_MAX == tok) {
 512                 man_vmsg(m, MANDOCERR_MACRO, ln, ppos, "%s", buf + ppos - 1);
 513                 return(1);
 514         }
 515
 516         /* The macro is sane.  Jump to the next word. */
 517
 518         while (buf[i] && ' ' == buf[i])
 519                 i++;
 520
 521         /*
 522          * Trailing whitespace.  Note that tabs are allowed to be passed
 523          * into the parser as "text", so we only warn about spaces here.
 524          */
 525
 526         if ('\0' == buf[i] && ' ' == buf[i - 1])
 527                 man_pmsg(m, ln, i - 1, MANDOCERR_EOLNSPACE);
 528
 529         /*
 530          * Remove prior ELINE macro, as it's being clobbered by a new
 531          * macro.  Note that NSCOPED macros do not close out ELINE
 532          * macros---they don't print text---so we let those slip by.
 533          */
 534
 535         if ( ! (MAN_NSCOPED & man_macros[tok].flags) &&
 536                         m->flags & MAN_ELINE) {
 537                 n = m->last;
 538                 assert(MAN_TEXT != n->type);
 539
 540                 /* Remove repeated NSCOPED macros causing ELINE. */
 541
 542                 if (MAN_NSCOPED & man_macros[n->tok].flags)
 543                         n = n->parent;
 544
 545                 man_vmsg(m, MANDOCERR_LINESCOPE, n->line, n->pos,
 546                                 "%s", man_macronames[n->tok]);
 547
 548                 man_node_delete(m, n);
 549                 m->flags &= ~MAN_ELINE;
 550         }
 551
 552         /*
 553          * Save the fact that we're in the next-line for a block.  In
 554          * this way, embedded roff instructions can "remember" state
 555          * when they exit.
 556          */
 557
 558         if (MAN_BLINE & m->flags)
 559                 m->flags |= MAN_BPLINE;
 560
 561         /* Call to handler... */
 562
 563         assert(man_macros[tok].fp);
 564         if ( ! (*man_macros[tok].fp)(m, tok, ln, ppos, &i, buf))
 565                 goto err;
 566
 567 out:
 568         /*
 569          * We weren't in a block-line scope when entering the
 570          * above-parsed macro, so return.
 571          */
 572
 573         if ( ! (MAN_BPLINE & m->flags)) {
 574                 m->flags &= ~MAN_ILINE;
 575                 return(1);
 576         }
 577         m->flags &= ~MAN_BPLINE;
 578
 579         /*
 580          * If we're in a block scope, then allow this macro to slip by
 581          * without closing scope around it.
 582          */
 583
 584         if (MAN_ILINE & m->flags) {
 585                 m->flags &= ~MAN_ILINE;
 586                 return(1);
 587         }
 588
 589         /*
 590          * If we've opened a new next-line element scope, then return
 591          * now, as the next line will close out the block scope.
 592          */
 593
 594         if (MAN_ELINE & m->flags)
 595                 return(1);
 596
 597         /* Close out the block scope opened in the prior line.  */
 598
 599         assert(MAN_BLINE & m->flags);
 600         m->flags &= ~MAN_BLINE;
 601
 602         if ( ! man_unscope(m, m->last->parent, MANDOCERR_MAX))
 603                 return(0);
 604         return(man_body_alloc(m, ln, offs, m->last->tok));
 605
 606 err:    /* Error out. */
 607
 608         m->flags |= MAN_HALT;
 609         return(0);
 610 }
 611
 612
 613 int
 614 man_vmsg(struct man *man, enum mandocerr t,
 615                 int ln, int pos, const char *fmt, ...)
 616 {
 617         char             buf[256];
 618         va_list          ap;
 619
 620         va_start(ap, fmt);
 621         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 622         va_end(ap);
 623         return((*man->msg)(t, man->data, ln, pos, buf));
 624 }
 625
 626
 627 /*
 628  * Unlink a node from its context.  If "m" is provided, the last parse
 629  * point will also be adjusted accordingly.
 630  */
 631 static void
 632 man_node_unlink(struct man *m, struct man_node *n)
 633 {
 634
 635         /* Adjust siblings. */
 636
 637         if (n->prev)
 638                 n->prev->next = n->next;
 639         if (n->next)
 640                 n->next->prev = n->prev;
 641
 642         /* Adjust parent. */
 643
 644         if (n->parent) {
 645                 n->parent->nchild--;
 646                 if (n->parent->child == n)
 647                         n->parent->child = n->prev ? n->prev : n->next;
 648         }
 649
 650         /* Adjust parse point, if applicable. */
 651
 652         if (m && m->last == n) {
 653                 /*XXX: this can occur when bailing from validation. */
 654                 /*assert(NULL == n->next);*/
 655                 if (n->prev) {
 656                         m->last = n->prev;
 657                         m->next = MAN_NEXT_SIBLING;
 658                 } else {
 659                         m->last = n->parent;
 660                         m->next = MAN_NEXT_CHILD;
 661                 }
 662         }
 663
 664         if (m && m->first == n)
 665                 m->first = NULL;
 666 }