html.c

   1 /*      $Id: html.c,v 1.148 2011/07/04 09:42:38 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2011 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 AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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 #ifdef HAVE_CONFIG_H
  19 #include "config.h"
  20 #endif
  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 <stdint.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 #include "mandoc.h"
  34 #include "libmandoc.h"
  35 #include "out.h"
  36 #include "html.h"
  37 #include "main.h"
  38
  39 struct  htmldata {
  40         const char       *name;
  41         int               flags;
  42 #define HTML_CLRLINE     (1 << 0)
  43 #define HTML_NOSTACK     (1 << 1)
  44 #define HTML_AUTOCLOSE   (1 << 2) /* Tag has auto-closure. */
  45 };
  46
  47 static  const struct htmldata htmltags[TAG_MAX] = {
  48         {"html",        HTML_CLRLINE}, /* TAG_HTML */
  49         {"head",        HTML_CLRLINE}, /* TAG_HEAD */
  50         {"body",        HTML_CLRLINE}, /* TAG_BODY */
  51         {"meta",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_META */
  52         {"title",       HTML_CLRLINE}, /* TAG_TITLE */
  53         {"div",         HTML_CLRLINE}, /* TAG_DIV */
  54         {"h1",          0}, /* TAG_H1 */
  55         {"h2",          0}, /* TAG_H2 */
  56         {"span",        0}, /* TAG_SPAN */
  57         {"link",        HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_LINK */
  58         {"br",          HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_BR */
  59         {"a",           0}, /* TAG_A */
  60         {"table",       HTML_CLRLINE}, /* TAG_TABLE */
  61         {"tbody",       HTML_CLRLINE}, /* TAG_TBODY */
  62         {"col",         HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_COL */
  63         {"tr",          HTML_CLRLINE}, /* TAG_TR */
  64         {"td",          HTML_CLRLINE}, /* TAG_TD */
  65         {"li",          HTML_CLRLINE}, /* TAG_LI */
  66         {"ul",          HTML_CLRLINE}, /* TAG_UL */
  67         {"ol",          HTML_CLRLINE}, /* TAG_OL */
  68         {"dl",          HTML_CLRLINE}, /* TAG_DL */
  69         {"dt",          HTML_CLRLINE}, /* TAG_DT */
  70         {"dd",          HTML_CLRLINE}, /* TAG_DD */
  71         {"blockquote",  HTML_CLRLINE}, /* TAG_BLOCKQUOTE */
  72         {"p",           HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_P */
  73         {"pre",         HTML_CLRLINE }, /* TAG_PRE */
  74         {"b",           0 }, /* TAG_B */
  75         {"i",           0 }, /* TAG_I */
  76         {"code",        0 }, /* TAG_CODE */
  77         {"small",       0 }, /* TAG_SMALL */
  78 };
  79
  80 static  const char      *const htmlattrs[ATTR_MAX] = {
  81         "http-equiv", /* ATTR_HTTPEQUIV */
  82         "content", /* ATTR_CONTENT */
  83         "name", /* ATTR_NAME */
  84         "rel", /* ATTR_REL */
  85         "href", /* ATTR_HREF */
  86         "type", /* ATTR_TYPE */
  87         "media", /* ATTR_MEDIA */
  88         "class", /* ATTR_CLASS */
  89         "style", /* ATTR_STYLE */
  90         "width", /* ATTR_WIDTH */
  91         "id", /* ATTR_ID */
  92         "summary", /* ATTR_SUMMARY */
  93         "align", /* ATTR_ALIGN */
  94         "colspan", /* ATTR_COLSPAN */
  95 };
  96
  97 static  const char      *const roffscales[SCALE_MAX] = {
  98         "cm", /* SCALE_CM */
  99         "in", /* SCALE_IN */
 100         "pc", /* SCALE_PC */
 101         "pt", /* SCALE_PT */
 102         "em", /* SCALE_EM */
 103         "em", /* SCALE_MM */
 104         "ex", /* SCALE_EN */
 105         "ex", /* SCALE_BU */
 106         "em", /* SCALE_VS */
 107         "ex", /* SCALE_FS */
 108 };
 109
 110 static  void     bufncat(struct html *, const char *, size_t);
 111 static  void     print_ctag(struct html *, enum htmltag);
 112 static  int      print_encode(struct html *, const char *, int);
 113 static  void     print_metaf(struct html *, enum mandoc_esc);
 114 static  void     print_attr(struct html *, const char *, const char *);
 115 static  void     *ml_alloc(char *, enum htmltype);
 116
 117 static void *
 118 ml_alloc(char *outopts, enum htmltype type)
 119 {
 120         struct html     *h;
 121         const char      *toks[4];
 122         char            *v;
 123
 124         toks[0] = "style";
 125         toks[1] = "man";
 126         toks[2] = "includes";
 127         toks[3] = NULL;
 128
 129         h = mandoc_calloc(1, sizeof(struct html));
 130
 131         h->type = type;
 132         h->tags.head = NULL;
 133         h->symtab = mchars_alloc();
 134
 135         while (outopts && *outopts)
 136                 switch (getsubopt(&outopts, UNCONST(toks), &v)) {
 137                 case (0):
 138                         h->style = v;
 139                         break;
 140                 case (1):
 141                         h->base_man = v;
 142                         break;
 143                 case (2):
 144                         h->base_includes = v;
 145                         break;
 146                 default:
 147                         break;
 148                 }
 149
 150         return(h);
 151 }
 152
 153 void *
 154 html_alloc(char *outopts)
 155 {
 156
 157         return(ml_alloc(outopts, HTML_HTML_4_01_STRICT));
 158 }
 159
 160
 161 void *
 162 xhtml_alloc(char *outopts)
 163 {
 164
 165         return(ml_alloc(outopts, HTML_XHTML_1_0_STRICT));
 166 }
 167
 168
 169 void
 170 html_free(void *p)
 171 {
 172         struct tag      *tag;
 173         struct html     *h;
 174
 175         h = (struct html *)p;
 176
 177         while ((tag = h->tags.head) != NULL) {
 178                 h->tags.head = tag->next;
 179                 free(tag);
 180         }
 181
 182         if (h->symtab)
 183                 mchars_free(h->symtab);
 184
 185         free(h);
 186 }
 187
 188
 189 void
 190 print_gen_head(struct html *h)
 191 {
 192         struct htmlpair  tag[4];
 193
 194         tag[0].key = ATTR_HTTPEQUIV;
 195         tag[0].val = "Content-Type";
 196         tag[1].key = ATTR_CONTENT;
 197         tag[1].val = "text/html; charset=utf-8";
 198         print_otag(h, TAG_META, 2, tag);
 199
 200         tag[0].key = ATTR_NAME;
 201         tag[0].val = "resource-type";
 202         tag[1].key = ATTR_CONTENT;
 203         tag[1].val = "document";
 204         print_otag(h, TAG_META, 2, tag);
 205
 206         if (h->style) {
 207                 tag[0].key = ATTR_REL;
 208                 tag[0].val = "stylesheet";
 209                 tag[1].key = ATTR_HREF;
 210                 tag[1].val = h->style;
 211                 tag[2].key = ATTR_TYPE;
 212                 tag[2].val = "text/css";
 213                 tag[3].key = ATTR_MEDIA;
 214                 tag[3].val = "all";
 215                 print_otag(h, TAG_LINK, 4, tag);
 216         }
 217 }
 218
 219 static void
 220 print_metaf(struct html *h, enum mandoc_esc deco)
 221 {
 222         enum htmlfont    font;
 223
 224         switch (deco) {
 225         case (ESCAPE_FONTPREV):
 226                 font = h->metal;
 227                 break;
 228         case (ESCAPE_FONTITALIC):
 229                 font = HTMLFONT_ITALIC;
 230                 break;
 231         case (ESCAPE_FONTBOLD):
 232                 font = HTMLFONT_BOLD;
 233                 break;
 234         case (ESCAPE_FONT):
 235                 /* FALLTHROUGH */
 236         case (ESCAPE_FONTROMAN):
 237                 font = HTMLFONT_NONE;
 238                 break;
 239         default:
 240                 abort();
 241                 /* NOTREACHED */
 242         }
 243
 244         if (h->metaf) {
 245                 print_tagq(h, h->metaf);
 246                 h->metaf = NULL;
 247         }
 248
 249         h->metal = h->metac;
 250         h->metac = font;
 251
 252         if (HTMLFONT_NONE != font)
 253                 h->metaf = HTMLFONT_BOLD == font ?
 254                         print_otag(h, TAG_B, 0, NULL) :
 255                         print_otag(h, TAG_I, 0, NULL);
 256 }
 257
 258 int
 259 html_strlen(const char *cp)
 260 {
 261         int              ssz, sz;
 262         const char      *seq, *p;
 263
 264         /*
 265          * Account for escaped sequences within string length
 266          * calculations.  This follows the logic in term_strlen() as we
 267          * must calculate the width of produced strings.
 268          * Assume that characters are always width of "1".  This is
 269          * hacky, but it gets the job done for approximation of widths.
 270          */
 271
 272         sz = 0;
 273         while (NULL != (p = strchr(cp, '\\'))) {
 274                 sz += (int)(p - cp);
 275                 ++cp;
 276                 switch (mandoc_escape(&cp, &seq, &ssz)) {
 277                 case (ESCAPE_ERROR):
 278                         return(sz);
 279                 case (ESCAPE_UNICODE):
 280                         /* FALLTHROUGH */
 281                 case (ESCAPE_NUMBERED):
 282                         /* FALLTHROUGH */
 283                 case (ESCAPE_SPECIAL):
 284                         sz++;
 285                         break;
 286                 default:
 287                         break;
 288                 }
 289         }
 290
 291         assert(sz >= 0);
 292         return(sz + strlen(cp));
 293 }
 294
 295 static int
 296 print_encode(struct html *h, const char *p, int norecurse)
 297 {
 298         size_t           sz;
 299         int              c, len, nospace;
 300         const char      *seq;
 301         enum mandoc_esc  esc;
 302         static const char rejs[6] = { '\\', '<', '>', '&', ASCII_HYPH, '\0' };
 303
 304         nospace = 0;
 305
 306         while ('\0' != *p) {
 307                 sz = strcspn(p, rejs);
 308
 309                 fwrite(p, 1, sz, stdout);
 310                 p += (int)sz;
 311
 312                 if ('\0' == *p)
 313                         break;
 314
 315                 switch (*p++) {
 316                 case ('<'):
 317                         printf("&lt;");
 318                         continue;
 319                 case ('>'):
 320                         printf("&gt;");
 321                         continue;
 322                 case ('&'):
 323                         printf("&amp;");
 324                         continue;
 325                 case (ASCII_HYPH):
 326                         putchar('-');
 327                         continue;
 328                 default:
 329                         break;
 330                 }
 331
 332                 esc = mandoc_escape(&p, &seq, &len);
 333                 if (ESCAPE_ERROR == esc)
 334                         break;
 335
 336                 switch (esc) {
 337                 case (ESCAPE_UNICODE):
 338                         /* Skip passed "u" header. */
 339                         c = mchars_num2uc(seq + 1, len - 1);
 340                         if ('\0' != c)
 341                                 printf("&#x%x;", c);
 342                         break;
 343                 case (ESCAPE_NUMBERED):
 344                         c = mchars_num2char(seq, len);
 345                         if ('\0' != c)
 346                                 putchar(c);
 347                         break;
 348                 case (ESCAPE_SPECIAL):
 349                         c = mchars_spec2cp(h->symtab, seq, len);
 350                         if (c > 0)
 351                                 printf("&#%d;", c);
 352                         else if (-1 == c && 1 == len)
 353                                 putchar((int)*seq);
 354                         break;
 355                 case (ESCAPE_FONT):
 356                         /* FALLTHROUGH */
 357                 case (ESCAPE_FONTPREV):
 358                         /* FALLTHROUGH */
 359                 case (ESCAPE_FONTBOLD):
 360                         /* FALLTHROUGH */
 361                 case (ESCAPE_FONTITALIC):
 362                         /* FALLTHROUGH */
 363                 case (ESCAPE_FONTROMAN):
 364                         if (norecurse)
 365                                 break;
 366                         print_metaf(h, esc);
 367                         break;
 368                 case (ESCAPE_NOSPACE):
 369                         if ('\0' == *p)
 370                                 nospace = 1;
 371                         break;
 372                 default:
 373                         break;
 374                 }
 375         }
 376
 377         return(nospace);
 378 }
 379
 380
 381 static void
 382 print_attr(struct html *h, const char *key, const char *val)
 383 {
 384         printf(" %s=\"", key);
 385         (void)print_encode(h, val, 1);
 386         putchar('\"');
 387 }
 388
 389
 390 struct tag *
 391 print_otag(struct html *h, enum htmltag tag,
 392                 int sz, const struct htmlpair *p)
 393 {
 394         int              i;
 395         struct tag      *t;
 396
 397         /* Push this tags onto the stack of open scopes. */
 398
 399         if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
 400                 t = mandoc_malloc(sizeof(struct tag));
 401                 t->tag = tag;
 402                 t->next = h->tags.head;
 403                 h->tags.head = t;
 404         } else
 405                 t = NULL;
 406
 407         if ( ! (HTML_NOSPACE & h->flags))
 408                 if ( ! (HTML_CLRLINE & htmltags[tag].flags)) {
 409                         /* Manage keeps! */
 410                         if ( ! (HTML_KEEP & h->flags)) {
 411                                 if (HTML_PREKEEP & h->flags)
 412                                         h->flags |= HTML_KEEP;
 413                                 putchar(' ');
 414                         } else
 415                                 printf("&#160;");
 416                 }
 417
 418         if ( ! (h->flags & HTML_NONOSPACE))
 419                 h->flags &= ~HTML_NOSPACE;
 420         else
 421                 h->flags |= HTML_NOSPACE;
 422
 423         /* Print out the tag name and attributes. */
 424
 425         printf("<%s", htmltags[tag].name);
 426         for (i = 0; i < sz; i++)
 427                 print_attr(h, htmlattrs[p[i].key], p[i].val);
 428
 429         /* Add non-overridable attributes. */
 430
 431         if (TAG_HTML == tag && HTML_XHTML_1_0_STRICT == h->type) {
 432                 print_attr(h, "xmlns", "http://www.w3.org/1999/xhtml");
 433                 print_attr(h, "xml:lang", "en");
 434                 print_attr(h, "lang", "en");
 435         }
 436
 437         /* Accommodate for XML "well-formed" singleton escaping. */
 438
 439         if (HTML_AUTOCLOSE & htmltags[tag].flags)
 440                 switch (h->type) {
 441                 case (HTML_XHTML_1_0_STRICT):
 442                         putchar('/');
 443                         break;
 444                 default:
 445                         break;
 446                 }
 447
 448         putchar('>');
 449
 450         h->flags |= HTML_NOSPACE;
 451
 452         if ((HTML_AUTOCLOSE | HTML_CLRLINE) & htmltags[tag].flags)
 453                 putchar('\n');
 454
 455         return(t);
 456 }
 457
 458
 459 static void
 460 print_ctag(struct html *h, enum htmltag tag)
 461 {
 462
 463         printf("</%s>", htmltags[tag].name);
 464         if (HTML_CLRLINE & htmltags[tag].flags) {
 465                 h->flags |= HTML_NOSPACE;
 466                 putchar('\n');
 467         }
 468 }
 469
 470 void
 471 print_gen_decls(struct html *h)
 472 {
 473         const char      *doctype;
 474         const char      *dtd;
 475         const char      *name;
 476
 477         switch (h->type) {
 478         case (HTML_HTML_4_01_STRICT):
 479                 name = "HTML";
 480                 doctype = "-//W3C//DTD HTML 4.01//EN";
 481                 dtd = "http://www.w3.org/TR/html4/strict.dtd";
 482                 break;
 483         default:
 484                 puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
 485                 name = "html";
 486                 doctype = "-//W3C//DTD XHTML 1.0 Strict//EN";
 487                 dtd = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
 488                 break;
 489         }
 490
 491         printf("<!DOCTYPE %s PUBLIC \"%s\" \"%s\">\n",
 492                         name, doctype, dtd);
 493 }
 494
 495 void
 496 print_text(struct html *h, const char *word)
 497 {
 498
 499         if ( ! (HTML_NOSPACE & h->flags)) {
 500                 /* Manage keeps! */
 501                 if ( ! (HTML_KEEP & h->flags)) {
 502                         if (HTML_PREKEEP & h->flags)
 503                                 h->flags |= HTML_KEEP;
 504                         putchar(' ');
 505                 } else
 506                         printf("&#160;");
 507         }
 508
 509         assert(NULL == h->metaf);
 510         if (HTMLFONT_NONE != h->metac)
 511                 h->metaf = HTMLFONT_BOLD == h->metac ?
 512                         print_otag(h, TAG_B, 0, NULL) :
 513                         print_otag(h, TAG_I, 0, NULL);
 514
 515         assert(word);
 516         if ( ! print_encode(h, word, 0))
 517                 if ( ! (h->flags & HTML_NONOSPACE))
 518                         h->flags &= ~HTML_NOSPACE;
 519
 520         if (h->metaf) {
 521                 print_tagq(h, h->metaf);
 522                 h->metaf = NULL;
 523         }
 524
 525         h->flags &= ~HTML_IGNDELIM;
 526 }
 527
 528
 529 void
 530 print_tagq(struct html *h, const struct tag *until)
 531 {
 532         struct tag      *tag;
 533
 534         while ((tag = h->tags.head) != NULL) {
 535                 /*
 536                  * Remember to close out and nullify the current
 537                  * meta-font and table, if applicable.
 538                  */
 539                 if (tag == h->metaf)
 540                         h->metaf = NULL;
 541                 if (tag == h->tblt)
 542                         h->tblt = NULL;
 543                 print_ctag(h, tag->tag);
 544                 h->tags.head = tag->next;
 545                 free(tag);
 546                 if (until && tag == until)
 547                         return;
 548         }
 549 }
 550
 551
 552 void
 553 print_stagq(struct html *h, const struct tag *suntil)
 554 {
 555         struct tag      *tag;
 556
 557         while ((tag = h->tags.head) != NULL) {
 558                 if (suntil && tag == suntil)
 559                         return;
 560                 /*
 561                  * Remember to close out and nullify the current
 562                  * meta-font and table, if applicable.
 563                  */
 564                 if (tag == h->metaf)
 565                         h->metaf = NULL;
 566                 if (tag == h->tblt)
 567                         h->tblt = NULL;
 568                 print_ctag(h, tag->tag);
 569                 h->tags.head = tag->next;
 570                 free(tag);
 571         }
 572 }
 573
 574 void
 575 bufinit(struct html *h)
 576 {
 577
 578         h->buf[0] = '\0';
 579         h->buflen = 0;
 580 }
 581
 582 void
 583 bufcat_style(struct html *h, const char *key, const char *val)
 584 {
 585
 586         bufcat(h, key);
 587         bufcat(h, ":");
 588         bufcat(h, val);
 589         bufcat(h, ";");
 590 }
 591
 592 void
 593 bufcat(struct html *h, const char *p)
 594 {
 595
 596         h->buflen = strlcat(h->buf, p, BUFSIZ);
 597         assert(h->buflen < BUFSIZ);
 598 }
 599
 600 void
 601 bufcat_fmt(struct html *h, const char *fmt, ...)
 602 {
 603         va_list          ap;
 604
 605         va_start(ap, fmt);
 606         (void)vsnprintf(h->buf + (int)h->buflen,
 607                         BUFSIZ - h->buflen - 1, fmt, ap);
 608         va_end(ap);
 609         h->buflen = strlen(h->buf);
 610 }
 611
 612 static void
 613 bufncat(struct html *h, const char *p, size_t sz)
 614 {
 615
 616         assert(h->buflen + sz + 1 < BUFSIZ);
 617         strncat(h->buf, p, sz);
 618         h->buflen += sz;
 619 }
 620
 621 void
 622 buffmt_includes(struct html *h, const char *name)
 623 {
 624         const char      *p, *pp;
 625
 626         pp = h->base_includes;
 627
 628         bufinit(h);
 629         while (NULL != (p = strchr(pp, '%'))) {
 630                 bufncat(h, pp, (size_t)(p - pp));
 631                 switch (*(p + 1)) {
 632                 case('I'):
 633                         bufcat(h, name);
 634                         break;
 635                 default:
 636                         bufncat(h, p, 2);
 637                         break;
 638                 }
 639                 pp = p + 2;
 640         }
 641         if (pp)
 642                 bufcat(h, pp);
 643 }
 644
 645 void
 646 buffmt_man(struct html *h,
 647                 const char *name, const char *sec)
 648 {
 649         const char      *p, *pp;
 650
 651         pp = h->base_man;
 652
 653         bufinit(h);
 654         while (NULL != (p = strchr(pp, '%'))) {
 655                 bufncat(h, pp, (size_t)(p - pp));
 656                 switch (*(p + 1)) {
 657                 case('S'):
 658                         bufcat(h, sec ? sec : "1");
 659                         break;
 660                 case('N'):
 661                         bufcat_fmt(h, name);
 662                         break;
 663                 default:
 664                         bufncat(h, p, 2);
 665                         break;
 666                 }
 667                 pp = p + 2;
 668         }
 669         if (pp)
 670                 bufcat(h, pp);
 671 }
 672
 673 void
 674 bufcat_su(struct html *h, const char *p, const struct roffsu *su)
 675 {
 676         double           v;
 677
 678         v = su->scale;
 679         if (SCALE_MM == su->unit && 0.0 == (v /= 100.0))
 680                 v = 1.0;
 681
 682         bufcat_fmt(h, "%s: %.2f%s;", p, v, roffscales[su->unit]);
 683 }
 684
 685 void
 686 bufcat_id(struct html *h, const char *src)
 687 {
 688
 689         /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
 690
 691         while ('\0' != *src)
 692                 bufcat_fmt(h, "%.2x", *src++);
 693 }