usr.bin/mandoc/html.c

   1 /*      $Id: html.c,v 1.96 2010/02/17 19:48:33 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
   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 #include <sys/types.h>
  18
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <stdarg.h>
  22 #include <stdio.h>
  23 #include <stdint.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include "out.h"
  29 #include "chars.h"
  30 #include "html.h"
  31 #include "main.h"
  32
  33 #define UNCONST(a)      ((void *)(uintptr_t)(const void *)(a))
  34
  35 struct  htmldata {
  36         const char       *name;
  37         int               flags;
  38 #define HTML_CLRLINE     (1 << 0)
  39 #define HTML_NOSTACK     (1 << 1)
  40 #define HTML_AUTOCLOSE   (1 << 2) /* Tag has auto-closure. */
  41 };
  42
  43 static  const struct htmldata htmltags[TAG_MAX] = {
  44         {"html",        HTML_CLRLINE}, /* TAG_HTML */
  45         {"head",        HTML_CLRLINE}, /* TAG_HEAD */
  46         {"body",        HTML_CLRLINE}, /* TAG_BODY */
  47         {"meta",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_META */
  48         {"title",       HTML_CLRLINE}, /* TAG_TITLE */
  49         {"div",         HTML_CLRLINE}, /* TAG_DIV */
  50         {"h1",          0}, /* TAG_H1 */
  51         {"h2",          0}, /* TAG_H2 */
  52         {"span",        0}, /* TAG_SPAN */
  53         {"link",        HTML_CLRLINE | HTML_NOSTACK}, /* TAG_LINK */
  54         {"br",          HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_BR */
  55         {"a",           0}, /* TAG_A */
  56         {"table",       HTML_CLRLINE}, /* TAG_TABLE */
  57         {"col",         HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_COL */
  58         {"tr",          HTML_CLRLINE}, /* TAG_TR */
  59         {"td",          HTML_CLRLINE}, /* TAG_TD */
  60         {"li",          HTML_CLRLINE}, /* TAG_LI */
  61         {"ul",          HTML_CLRLINE}, /* TAG_UL */
  62         {"ol",          HTML_CLRLINE}, /* TAG_OL */
  63 };
  64
  65 static  const char      *const htmlfonts[HTMLFONT_MAX] = {
  66         "roman",
  67         "bold",
  68         "italic"
  69 };
  70
  71 static  const char      *const htmlattrs[ATTR_MAX] = {
  72         "http-equiv",
  73         "content",
  74         "name",
  75         "rel",
  76         "href",
  77         "type",
  78         "media",
  79         "class",
  80         "style",
  81         "width",
  82         "valign",
  83         "target",
  84         "id",
  85         "summary",
  86 };
  87
  88 static  void              print_spec(struct html *, const char *, size_t);
  89 static  void              print_res(struct html *, const char *, size_t);
  90 static  void              print_ctag(struct html *, enum htmltag);
  91 static  void              print_doctype(struct html *);
  92 static  void              print_xmltype(struct html *);
  93 static  int               print_encode(struct html *, const char *, int);
  94 static  void              print_metaf(struct html *, enum roffdeco);
  95 static  void              print_attr(struct html *,
  96                                 const char *, const char *);
  97 static  void             *ml_alloc(char *, enum htmltype);
  98
  99
 100 static void *
 101 ml_alloc(char *outopts, enum htmltype type)
 102 {
 103         struct html     *h;
 104         const char      *toks[4];
 105         char            *v;
 106
 107         toks[0] = "style";
 108         toks[1] = "man";
 109         toks[2] = "includes";
 110         toks[3] = NULL;
 111
 112         h = calloc(1, sizeof(struct html));
 113         if (NULL == h) {
 114                 perror(NULL);
 115                 exit(EXIT_FAILURE);
 116         }
 117
 118         h->type = type;
 119         h->tags.head = NULL;
 120         h->ords.head = NULL;
 121         h->symtab = chars_init(CHARS_HTML);
 122
 123         while (outopts && *outopts)
 124                 switch (getsubopt(&outopts, UNCONST(toks), &v)) {
 125                 case (0):
 126                         h->style = v;
 127                         break;
 128                 case (1):
 129                         h->base_man = v;
 130                         break;
 131                 case (2):
 132                         h->base_includes = v;
 133                         break;
 134                 default:
 135                         break;
 136                 }
 137
 138         return(h);
 139 }
 140
 141 void *
 142 html_alloc(char *outopts)
 143 {
 144
 145         return(ml_alloc(outopts, HTML_HTML_4_01_STRICT));
 146 }
 147
 148
 149 void *
 150 xhtml_alloc(char *outopts)
 151 {
 152
 153         return(ml_alloc(outopts, HTML_XHTML_1_0_STRICT));
 154 }
 155
 156
 157 void
 158 html_free(void *p)
 159 {
 160         struct tag      *tag;
 161         struct ord      *ord;
 162         struct html     *h;
 163
 164         h = (struct html *)p;
 165
 166         while ((ord = h->ords.head) != NULL) {
 167                 h->ords.head = ord->next;
 168                 free(ord);
 169         }
 170
 171         while ((tag = h->tags.head) != NULL) {
 172                 h->tags.head = tag->next;
 173                 free(tag);
 174         }
 175
 176         if (h->symtab)
 177                 chars_free(h->symtab);
 178
 179         free(h);
 180 }
 181
 182
 183 void
 184 print_gen_head(struct html *h)
 185 {
 186         struct htmlpair  tag[4];
 187
 188         tag[0].key = ATTR_HTTPEQUIV;
 189         tag[0].val = "Content-Type";
 190         tag[1].key = ATTR_CONTENT;
 191         tag[1].val = "text/html; charset=utf-8";
 192         print_otag(h, TAG_META, 2, tag);
 193
 194         tag[0].key = ATTR_NAME;
 195         tag[0].val = "resource-type";
 196         tag[1].key = ATTR_CONTENT;
 197         tag[1].val = "document";
 198         print_otag(h, TAG_META, 2, tag);
 199
 200         if (h->style) {
 201                 tag[0].key = ATTR_REL;
 202                 tag[0].val = "stylesheet";
 203                 tag[1].key = ATTR_HREF;
 204                 tag[1].val = h->style;
 205                 tag[2].key = ATTR_TYPE;
 206                 tag[2].val = "text/css";
 207                 tag[3].key = ATTR_MEDIA;
 208                 tag[3].val = "all";
 209                 print_otag(h, TAG_LINK, 4, tag);
 210         }
 211 }
 212
 213
 214 static void
 215 print_spec(struct html *h, const char *p, size_t len)
 216 {
 217         const char      *rhs;
 218         size_t           sz;
 219
 220         rhs = chars_a2ascii(h->symtab, p, len, &sz);
 221
 222         if (NULL == rhs)
 223                 return;
 224         fwrite(rhs, 1, sz, stdout);
 225 }
 226
 227
 228 static void
 229 print_res(struct html *h, const char *p, size_t len)
 230 {
 231         const char      *rhs;
 232         size_t           sz;
 233
 234         rhs = chars_a2res(h->symtab, p, len, &sz);
 235
 236         if (NULL == rhs)
 237                 return;
 238         fwrite(rhs, 1, sz, stdout);
 239 }
 240
 241
 242 struct tag *
 243 print_ofont(struct html *h, enum htmlfont font)
 244 {
 245         struct htmlpair  tag;
 246
 247         h->metal = h->metac;
 248         h->metac = font;
 249
 250         /* FIXME: DECO_ROMAN should just close out preexisting. */
 251
 252         if (h->metaf && h->tags.head == h->metaf)
 253                 print_tagq(h, h->metaf);
 254
 255         PAIR_CLASS_INIT(&tag, htmlfonts[font]);
 256         h->metaf = print_otag(h, TAG_SPAN, 1, &tag);
 257         return(h->metaf);
 258 }
 259
 260
 261 static void
 262 print_metaf(struct html *h, enum roffdeco deco)
 263 {
 264         enum htmlfont    font;
 265
 266         switch (deco) {
 267         case (DECO_PREVIOUS):
 268                 font = h->metal;
 269                 break;
 270         case (DECO_ITALIC):
 271                 font = HTMLFONT_ITALIC;
 272                 break;
 273         case (DECO_BOLD):
 274                 font = HTMLFONT_BOLD;
 275                 break;
 276         case (DECO_ROMAN):
 277                 font = HTMLFONT_NONE;
 278                 break;
 279         default:
 280                 abort();
 281                 /* NOTREACHED */
 282         }
 283
 284         (void)print_ofont(h, font);
 285 }
 286
 287
 288 static int
 289 print_encode(struct html *h, const char *p, int norecurse)
 290 {
 291         size_t           sz;
 292         int              len, nospace;
 293         const char      *seq;
 294         enum roffdeco    deco;
 295
 296         nospace = 0;
 297
 298         for (; *p; p++) {
 299                 sz = strcspn(p, "\\<>&");
 300
 301                 fwrite(p, 1, sz, stdout);
 302                 p += /* LINTED */
 303                         sz;
 304
 305                 if ('<' == *p) {
 306                         printf("&lt;");
 307                         continue;
 308                 } else if ('>' == *p) {
 309                         printf("&gt;");
 310                         continue;
 311                 } else if ('&' == *p) {
 312                         printf("&amp;");
 313                         continue;
 314                 } else if ('\0' == *p)
 315                         break;
 316
 317                 seq = ++p;
 318                 len = a2roffdeco(&deco, &seq, &sz);
 319
 320                 switch (deco) {
 321                 case (DECO_RESERVED):
 322                         print_res(h, seq, sz);
 323                         break;
 324                 case (DECO_SPECIAL):
 325                         print_spec(h, seq, sz);
 326                         break;
 327                 case (DECO_PREVIOUS):
 328                         /* FALLTHROUGH */
 329                 case (DECO_BOLD):
 330                         /* FALLTHROUGH */
 331                 case (DECO_ITALIC):
 332                         /* FALLTHROUGH */
 333                 case (DECO_ROMAN):
 334                         if (norecurse)
 335                                 break;
 336                         print_metaf(h, deco);
 337                         break;
 338                 default:
 339                         break;
 340                 }
 341
 342                 p += len - 1;
 343
 344                 if (DECO_NOSPACE == deco && '\0' == *(p + 1))
 345                         nospace = 1;
 346         }
 347
 348         return(nospace);
 349 }
 350
 351
 352 static void
 353 print_attr(struct html *h, const char *key, const char *val)
 354 {
 355         printf(" %s=\"", key);
 356         (void)print_encode(h, val, 1);
 357         putchar('\"');
 358 }
 359
 360
 361 struct tag *
 362 print_otag(struct html *h, enum htmltag tag,
 363                 int sz, const struct htmlpair *p)
 364 {
 365         int              i;
 366         struct tag      *t;
 367
 368         /* Push this tags onto the stack of open scopes. */
 369
 370         if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
 371                 t = malloc(sizeof(struct tag));
 372                 if (NULL == t) {
 373                         perror(NULL);
 374                         exit(EXIT_FAILURE);
 375                 }
 376                 t->tag = tag;
 377                 t->next = h->tags.head;
 378                 h->tags.head = t;
 379         } else
 380                 t = NULL;
 381
 382         if ( ! (HTML_NOSPACE & h->flags))
 383                 if ( ! (HTML_CLRLINE & htmltags[tag].flags))
 384                         putchar(' ');
 385
 386         /* Print out the tag name and attributes. */
 387
 388         printf("<%s", htmltags[tag].name);
 389         for (i = 0; i < sz; i++)
 390                 print_attr(h, htmlattrs[p[i].key], p[i].val);
 391
 392         /* Add non-overridable attributes. */
 393
 394         if (TAG_HTML == tag && HTML_XHTML_1_0_STRICT == h->type) {
 395                 print_attr(h, "xmlns", "http://www.w3.org/1999/xhtml");
 396                 print_attr(h, "xml:lang", "en");
 397                 print_attr(h, "lang", "en");
 398         }
 399
 400         /* Accomodate for XML "well-formed" singleton escaping. */
 401
 402         if (HTML_AUTOCLOSE & htmltags[tag].flags)
 403                 switch (h->type) {
 404                 case (HTML_XHTML_1_0_STRICT):
 405                         putchar('/');
 406                         break;
 407                 default:
 408                         break;
 409                 }
 410
 411         putchar('>');
 412
 413         h->flags |= HTML_NOSPACE;
 414         return(t);
 415 }
 416
 417
 418 static void
 419 print_ctag(struct html *h, enum htmltag tag)
 420 {
 421
 422         printf("</%s>", htmltags[tag].name);
 423         if (HTML_CLRLINE & htmltags[tag].flags) {
 424                 h->flags |= HTML_NOSPACE;
 425                 putchar('\n');
 426         }
 427 }
 428
 429
 430 void
 431 print_gen_decls(struct html *h)
 432 {
 433
 434         print_xmltype(h);
 435         print_doctype(h);
 436 }
 437
 438
 439 static void
 440 print_xmltype(struct html *h)
 441 {
 442         const char      *decl;
 443
 444         switch (h->type) {
 445         case (HTML_XHTML_1_0_STRICT):
 446                 decl = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
 447                 break;
 448         default:
 449                 decl = NULL;
 450                 break;
 451         }
 452
 453         if (NULL == decl)
 454                 return;
 455
 456         printf("%s\n", decl);
 457 }
 458
 459
 460 static void
 461 print_doctype(struct html *h)
 462 {
 463         const char      *doctype;
 464         const char      *dtd;
 465         const char      *name;
 466
 467         switch (h->type) {
 468         case (HTML_HTML_4_01_STRICT):
 469                 name = "HTML";
 470                 doctype = "-//W3C//DTD HTML 4.01//EN";
 471                 dtd = "http://www.w3.org/TR/html4/strict.dtd";
 472                 break;
 473         default:
 474                 name = "html";
 475                 doctype = "-//W3C//DTD XHTML 1.0 Strict//EN";
 476                 dtd = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
 477                 break;
 478         }
 479
 480         printf("<!DOCTYPE %s PUBLIC \"%s\" \"%s\">\n",
 481                         name, doctype, dtd);
 482 }
 483
 484
 485 void
 486 print_text(struct html *h, const char *p)
 487 {
 488
 489         if (*p && 0 == *(p + 1))
 490                 switch (*p) {
 491                 case('.'):
 492                         /* FALLTHROUGH */
 493                 case(','):
 494                         /* FALLTHROUGH */
 495                 case(';'):
 496                         /* FALLTHROUGH */
 497                 case(':'):
 498                         /* FALLTHROUGH */
 499                 case('?'):
 500                         /* FALLTHROUGH */
 501                 case('!'):
 502                         /* FALLTHROUGH */
 503                 case(')'):
 504                         /* FALLTHROUGH */
 505                 case(']'):
 506                         /* FALLTHROUGH */
 507                 case('}'):
 508                         if ( ! (HTML_IGNDELIM & h->flags))
 509                                 h->flags |= HTML_NOSPACE;
 510                         break;
 511                 default:
 512                         break;
 513                 }
 514
 515         if ( ! (h->flags & HTML_NOSPACE))
 516                 putchar(' ');
 517
 518         assert(p);
 519         if ( ! print_encode(h, p, 0))
 520                 h->flags &= ~HTML_NOSPACE;
 521
 522         if (*p && 0 == *(p + 1))
 523                 switch (*p) {
 524                 case('('):
 525                         /* FALLTHROUGH */
 526                 case('['):
 527                         /* FALLTHROUGH */
 528                 case('{'):
 529                         h->flags |= HTML_NOSPACE;
 530                         break;
 531                 default:
 532                         break;
 533                 }
 534 }
 535
 536
 537 void
 538 print_tagq(struct html *h, const struct tag *until)
 539 {
 540         struct tag      *tag;
 541
 542         while ((tag = h->tags.head) != NULL) {
 543                 if (tag == h->metaf)
 544                         h->metaf = NULL;
 545                 print_ctag(h, tag->tag);
 546                 h->tags.head = tag->next;
 547                 free(tag);
 548                 if (until && tag == until)
 549                         return;
 550         }
 551 }
 552
 553
 554 void
 555 print_stagq(struct html *h, const struct tag *suntil)
 556 {
 557         struct tag      *tag;
 558
 559         while ((tag = h->tags.head) != NULL) {
 560                 if (suntil && tag == suntil)
 561                         return;
 562                 if (tag == h->metaf)
 563                         h->metaf = NULL;
 564                 print_ctag(h, tag->tag);
 565                 h->tags.head = tag->next;
 566                 free(tag);
 567         }
 568 }
 569
 570
 571 void
 572 bufinit(struct html *h)
 573 {
 574
 575         h->buf[0] = '\0';
 576         h->buflen = 0;
 577 }
 578
 579
 580 void
 581 bufcat_style(struct html *h, const char *key, const char *val)
 582 {
 583
 584         bufcat(h, key);
 585         bufncat(h, ":", 1);
 586         bufcat(h, val);
 587         bufncat(h, ";", 1);
 588 }
 589
 590
 591 void
 592 bufcat(struct html *h, const char *p)
 593 {
 594
 595         bufncat(h, p, strlen(p));
 596 }
 597
 598
 599 void
 600 buffmt(struct html *h, const char *fmt, ...)
 601 {
 602         va_list          ap;
 603
 604         va_start(ap, fmt);
 605         (void)vsnprintf(h->buf + (int)h->buflen,
 606                         BUFSIZ - h->buflen - 1, fmt, ap);
 607         va_end(ap);
 608         h->buflen = strlen(h->buf);
 609 }
 610
 611
 612 void
 613 bufncat(struct html *h, const char *p, size_t sz)
 614 {
 615
 616         if (h->buflen + sz > BUFSIZ - 1)
 617                 sz = BUFSIZ - 1 - h->buflen;
 618
 619         (void)strncat(h->buf, p, sz);
 620         h->buflen += sz;
 621 }
 622
 623
 624 void
 625 buffmt_includes(struct html *h, const char *name)
 626 {
 627         const char      *p, *pp;
 628
 629         pp = h->base_includes;
 630
 631         while (NULL != (p = strchr(pp, '%'))) {
 632                 bufncat(h, pp, (size_t)(p - pp));
 633                 switch (*(p + 1)) {
 634                 case('I'):
 635                         bufcat(h, name);
 636                         break;
 637                 default:
 638                         bufncat(h, p, 2);
 639                         break;
 640                 }
 641                 pp = p + 2;
 642         }
 643         if (pp)
 644                 bufcat(h, pp);
 645 }
 646
 647
 648 void
 649 buffmt_man(struct html *h,
 650                 const char *name, const char *sec)
 651 {
 652         const char      *p, *pp;
 653
 654         pp = h->base_man;
 655
 656         /* LINTED */
 657         while (NULL != (p = strchr(pp, '%'))) {
 658                 bufncat(h, pp, (size_t)(p - pp));
 659                 switch (*(p + 1)) {
 660                 case('S'):
 661                         bufcat(h, sec ? sec : "1");
 662                         break;
 663                 case('N'):
 664                         buffmt(h, name);
 665                         break;
 666                 default:
 667                         bufncat(h, p, 2);
 668                         break;
 669                 }
 670                 pp = p + 2;
 671         }
 672         if (pp)
 673                 bufcat(h, pp);
 674 }
 675
 676
 677 void
 678 bufcat_su(struct html *h, const char *p, const struct roffsu *su)
 679 {
 680         double           v;
 681         const char      *u;
 682
 683         v = su->scale;
 684
 685         switch (su->unit) {
 686         case (SCALE_CM):
 687                 u = "cm";
 688                 break;
 689         case (SCALE_IN):
 690                 u = "in";
 691                 break;
 692         case (SCALE_PC):
 693                 u = "pc";
 694                 break;
 695         case (SCALE_PT):
 696                 u = "pt";
 697                 break;
 698         case (SCALE_EM):
 699                 u = "em";
 700                 break;
 701         case (SCALE_MM):
 702                 if (0 == (v /= 100))
 703                         v = 1;
 704                 u = "em";
 705                 break;
 706         case (SCALE_EN):
 707                 u = "ex";
 708                 break;
 709         case (SCALE_BU):
 710                 u = "ex";
 711                 break;
 712         case (SCALE_VS):
 713                 u = "em";
 714                 break;
 715         default:
 716                 u = "ex";
 717                 break;
 718         }
 719
 720         if (su->pt)
 721                 buffmt(h, "%s: %f%s;", p, v, u);
 722         else
 723                 /* LINTED */
 724                 buffmt(h, "%s: %d%s;", p, (int)v, u);
 725 }
 726
 727
 728 void
 729 html_idcat(char *dst, const char *src, int sz)
 730 {
 731         int              ssz;
 732
 733         assert(sz);
 734
 735         /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
 736
 737         for ( ; *dst != '\0' && sz; dst++, sz--)
 738                 /* Jump to end. */ ;
 739
 740         assert(sz > 2);
 741
 742         /* We can't start with a number (bah). */
 743
 744         *dst++ = 'x';
 745         *dst = '\0';
 746         sz--;
 747
 748         for ( ; *src != '\0' && sz > 1; src++) {
 749                 ssz = snprintf(dst, (size_t)sz, "%.2x", *src);
 750                 sz -= ssz;
 751                 dst += ssz;
 752         }
 753 }