khtml/html/dtd.cpp

   1 /**
   2  * This file is part of the DOM implementation for KDE.
   3  *
   4  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   5  *           (C) 2006-2007 Allan Sandfeld Jensen (kde@carewolf.com)
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public License
  18  * along with this library; see the file COPYING.LIB.  If not, write to
  19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20  * Boston, MA 02110-1301, USA.
  21  *
  22  */
  23
  24 #include "html/dtd.h"
  25
  26 using namespace DOM;
  27
  28 #include <kdebug.h>
  29 #include <kglobal.h>
  30
  31 // priority of tags. Closing tags of higher priority close tags of lower
  32 // priority.
  33 // Update this list, whenever you change htmltags.*
  34 //
  35 // 0 elements with forbidden close tag and text. They don't get pushed
  36 //   to the stack.
  37 // 1 formatting elements
  38 // 3 form nobr noscript
  39 // 5 phrasing elements
  40 // 6 TD TH SELECT
  41 // 7 TR
  42 // 8 tbody thead tfoot
  43 // 9 table
  44 // 10 body frameset head noembed noframes
  45 // 11 html
  46
  47 const unsigned short KDE_NO_EXPORT DOM::tagPriorityArray[] = {
  48     0, // 0
  49     1, // ID_A == 1
  50     1, // ID_ABBR
  51     1, // ID_ACRONYM
  52     5, // ID_ADDRESS
  53     1, // ID_APPLET
  54     0, // ID_AREA
  55     1, // ID_AUDIO
  56     1, // ID_B
  57     0, // ID_BASE
  58     0, // ID_BASEFONT
  59     1, // ID_BDO
  60     1, // ID_BIG
  61     5, // ID_BLOCKQUOTE
  62    10, // ID_BODY
  63     0, // ID_BR
  64     1, // ID_BUTTON
  65     1, // ID_CANVAS
  66     5, // ID_CAPTION
  67     5, // ID_CENTER
  68     1, // ID_CITE
  69     1, // ID_CODE
  70     0, // ID_COL
  71     1, // ID_COLGROUP
  72     5, // ID_DD
  73     1, // ID_DEL
  74     1, // ID_DFN
  75     5, // ID_DIR
  76     5, // ID_DIV
  77     5, // ID_DL
  78     5, // ID_DT
  79     1, // ID_EM
  80     0, // ID_EMBED
  81     5, // ID_FIELDSET
  82     1, // ID_FONT
  83     3, // ID_FORM
  84     0, // ID_FRAME
  85    10,// ID_FRAMESET
  86     5, // ID_H1
  87     5, // ID_H2
  88     5, // ID_H3
  89     5, // ID_H4
  90     5, // ID_H5
  91     5, // ID_H6
  92    10,// ID_HEAD
  93     0, // ID_HR
  94    11,// ID_HTML
  95     1, // ID_I
  96     1, // ID_IFRAME
  97     1, // ID_ILAYER
  98     0, // ID_IMAGE
  99     0, // ID_IMG
 100     0, // ID_INPUT
 101     1, // ID_INS
 102     0, // ID_ISINDEX
 103     1, // ID_KBD
 104     0, // ID_KEYGEN
 105     1, // ID_LABEL
 106     1, // ID_LAYER
 107     1, // ID_LEGEND
 108     5, // ID_LI
 109     0, // ID_LINK
 110     5, // ID_LISTING
 111     1, // ID_MAP
 112     5, // ID_MARQUEE
 113     5, // ID_MENU
 114     0, // ID_META
 115     5, // ID_NOBR
 116    10,// ID_NOEMBED
 117    10,// ID_NOFRAMES
 118     3, // ID_NOSCRIPT
 119     1, // ID_NOLAYER
 120     5, // ID_OBJECT
 121     5, // ID_OL
 122     1, // ID_OPTGROUP
 123     2, // ID_OPTION
 124     5, // ID_P
 125     0, // ID_PARAM
 126     5, // ID_PLAINTEXT
 127     5, // ID_PRE
 128     1, // ID_Q
 129     1, // ID_S
 130     1, // ID_SAMP
 131     1, // ID_SCRIPT
 132     6, // ID_SELECT
 133     1, // ID_SMALL
 134     1, // ID_SOURCE
 135     1, // ID_SPAN
 136     1, // ID_STRIKE
 137     1, // ID_STRONG
 138     1, // ID_STYLE
 139     1, // ID_SUB
 140     1, // ID_SUP
 141     9, // ID_TABLE
 142     8, // ID_TBODY
 143     6, // ID_TD
 144     1, // ID_TEXTAREA
 145     8, // ID_TFOOT
 146     6, // ID_TH
 147     8, // ID_THEAD
 148     1, // ID_TITLE
 149     7, // ID_TR
 150     1, // ID_TT
 151     1, // ID_U
 152     5, // ID_UL
 153     1, // ID_VAR
 154     1, // ID_VIDEO
 155     0, // ID_WBR
 156     5, // ID_XMP
 157     0, // ID_TEXT
 158 };
 159
 160 const tagStatus DOM::endTagArray[] = {
 161     REQUIRED,  // 0
 162     REQUIRED,  // ID_A == 1
 163     REQUIRED,  // ID_ABBR
 164     REQUIRED,  // ID_ACRONYM
 165     REQUIRED,  // ID_ADDRESS
 166     REQUIRED,  // ID_APPLET
 167     FORBIDDEN, // ID_AREA
 168     REQUIRED,  // ID_AUDIO
 169     REQUIRED,  // ID_B
 170     FORBIDDEN, // ID_BASE
 171     FORBIDDEN, // ID_BASEFONT
 172     REQUIRED,  // ID_BDO
 173     REQUIRED,  // ID_BIG
 174     REQUIRED,  // ID_BLOCKQUOTE
 175     REQUIRED,  // ID_BODY
 176     FORBIDDEN, // ID_BR
 177     REQUIRED,  // ID_BUTTON
 178     REQUIRED,  // ID_CANVAS
 179     REQUIRED,  // ID_CAPTION
 180     REQUIRED,  // ID_CENTER
 181     REQUIRED,  // ID_CITE
 182     REQUIRED,  // ID_CODE
 183     FORBIDDEN, // ID_COL
 184     OPTIONAL,  // ID_COLGROUP
 185     OPTIONAL,  // ID_DD
 186     REQUIRED,  // ID_DEL
 187     REQUIRED,  // ID_DFN
 188     REQUIRED,  // ID_DIR
 189     REQUIRED,  // ID_DIV
 190     REQUIRED,  // ID_DL
 191     OPTIONAL,  // ID_DT
 192     REQUIRED,  // ID_EM
 193     REQUIRED,  // ID_EMBED
 194     REQUIRED,  // ID_FIELDSET
 195     REQUIRED,  // ID_FONT
 196     REQUIRED,  // ID_FORM
 197     FORBIDDEN, // ID_FRAME
 198     REQUIRED,  // ID_FRAMESET
 199     REQUIRED,  // ID_H1
 200     REQUIRED,  // ID_H2
 201     REQUIRED,  // ID_H3
 202     REQUIRED,  // ID_H4
 203     REQUIRED,  // ID_H5
 204     REQUIRED,  // ID_H6
 205     OPTIONAL,  // ID_HEAD
 206     FORBIDDEN, // ID_HR
 207     REQUIRED,  // ID_HTML
 208     REQUIRED,  // ID_I
 209     REQUIRED,  // ID_IFRAME
 210     REQUIRED,  // ID_ILAYER
 211     FORBIDDEN, // ID_IMAGE
 212     FORBIDDEN, // ID_IMG
 213     FORBIDDEN, // ID_INPUT
 214     REQUIRED,  // ID_INS
 215     FORBIDDEN, // ID_ISINDEX
 216     REQUIRED,  // ID_KBD
 217     REQUIRED,  // ID_KEYGEN
 218     REQUIRED,  // ID_LABEL
 219     REQUIRED,  // ID_LAYER
 220     REQUIRED,  // ID_LEGEND
 221     OPTIONAL,  // ID_LI
 222     FORBIDDEN, // ID_LINK
 223     REQUIRED,  // ID_LISTING
 224     REQUIRED,  // ID_MAP
 225     REQUIRED,  // ID_MARQUEE
 226     REQUIRED,  // ID_MENU
 227     FORBIDDEN, // ID_META
 228     REQUIRED,  // ID_NOBR
 229     REQUIRED,  // ID_NOEMBED
 230     REQUIRED,  // ID_NOFRAMES
 231     REQUIRED,  // ID_NOSCRIPT
 232     REQUIRED,  // ID_NOLAYER
 233     REQUIRED,  // ID_OBJECT
 234     REQUIRED,  // ID_OL
 235     REQUIRED,  // ID_OPTGROUP
 236     OPTIONAL,  // ID_OPTION
 237     OPTIONAL,  // ID_P
 238     FORBIDDEN, // ID_PARAM
 239     REQUIRED,  // ID_PLAINTEXT
 240     REQUIRED,  // ID_PRE
 241     REQUIRED,  // ID_Q
 242     REQUIRED,  // ID_S
 243     REQUIRED,  // ID_SAMP
 244     REQUIRED,  // ID_SCRIPT
 245     REQUIRED,  // ID_SELECT
 246     REQUIRED,  // ID_SMALL
 247     FORBIDDEN, // ID_SOURCE
 248     REQUIRED,  // ID_SPAN
 249     REQUIRED,  // ID_STRIKE
 250     REQUIRED,  // ID_STRONG
 251     REQUIRED,  // ID_STYLE
 252     REQUIRED,  // ID_SUB
 253     REQUIRED,  // ID_SUP
 254     REQUIRED,  // ID_TABLE
 255     OPTIONAL,  // ID_TBODY
 256     OPTIONAL,  // ID_TD
 257     REQUIRED,  // ID_TEXTAREA
 258     OPTIONAL,  // ID_TFOOT
 259     OPTIONAL,  // ID_TH
 260     OPTIONAL,  // ID_THEAD
 261     REQUIRED,  // ID_TITLE
 262     OPTIONAL,  // ID_TR
 263     REQUIRED,  // ID_TT
 264     REQUIRED,  // ID_U
 265     REQUIRED,  // ID_UL
 266     REQUIRED,  // ID_VAR
 267     REQUIRED,  // ID_VIDEO
 268     FORBIDDEN, // ID_WBR
 269     REQUIRED,  // ID_XMP
 270     REQUIRED   // ID_TEXT
 271 };
 272
 273 // This a combination of HTML4.dtd XHTML11.dtd and various extensions
 274 // and deprecated elements
 275 static const ushort tag_list_inline[] = {
 276     ID_TEXT,
 277     // %fontstyle
 278     ID_TT,
 279     ID_I,
 280     ID_B,
 281     ID_BIG,
 282     ID_SMALL,
 283     ID_U,           // legacy
 284     ID_S,           // legacy
 285     ID_STRIKE,      // legacy
 286     ID_FONT,        // legacy
 287     ID_BASEFONT,    // legacy
 288     // %phrase
 289     ID_EM,
 290     ID_STRONG,
 291     ID_DFN,
 292     ID_CODE,
 293     ID_Q,
 294     ID_SAMP,
 295     ID_KBD,
 296     ID_VAR,
 297     ID_CITE,
 298     ID_ABBR,
 299     ID_ACRONYM,
 300     ID_SUB,
 301     ID_SUP,
 302     // %inline.forms
 303     ID_INPUT,
 304     ID_SELECT,
 305     ID_TEXTAREA,
 306     ID_LABEL,
 307     ID_BUTTON,
 308     // %special
 309     ID_A,
 310     ID_OBJECT,
 311     ID_IMAGE,
 312     ID_IMG,
 313     ID_APPLET,
 314     ID_IFRAME,
 315     ID_EMBED,       // ?
 316     // %special.pre
 317     ID_BR,
 318     ID_SPAN,
 319     ID_BDO,
 320     ID_MAP,
 321     // %misc.inline
 322     ID_SCRIPT,
 323     ID_INS,
 324     ID_DEL,
 325     // non-standard:
 326     ID_ILAYER,      // deprecated
 327     ID_NOBR,        // ?
 328     ID_WBR,         // ?
 329     ID_CANVAS,
 330     ID_AUDIO,
 331     ID_VIDEO,
 332     0
 333 };
 334
 335 static const ushort tag_list_quirk_inline[] = {
 336     ID_NOSCRIPT,    // block, but parsed as inline in Mozilla and MSIE
 337     0
 338 };
 339
 340 static const ushort tag_list_block[] = {
 341     ID_TEXT, // white-space is allowed
 342     ID_P,
 343     // %headings
 344     ID_H1,
 345     ID_H2,
 346     ID_H3,
 347     ID_H4,
 348     ID_H5,
 349     ID_H6,
 350     // %lists
 351     ID_UL,
 352     ID_OL,
 353     ID_DL,
 354     ID_DIR,         // legacy
 355     ID_MENU,        // legacy
 356     // %blocktext
 357     ID_LISTING,
 358     ID_PRE,
 359     ID_HR,
 360     ID_BLOCKQUOTE,
 361     ID_ADDRESS,
 362     ID_PLAINTEXT,   // ?
 363     ID_XMP,         // ?
 364     ID_CENTER,      // legacy
 365     // other
 366     ID_DIV,
 367     ID_FIELDSET,
 368     ID_TABLE,
 369     ID_NOSCRIPT,
 370     ID_NOFRAMES,
 371     ID_FORM,
 372     ID_ISINDEX,     // legacy
 373     // non-standard:
 374     ID_LAYER,       // deprecated
 375     ID_MARQUEE,     // extension
 376     0
 377 };
 378
 379 // block elements allowed for quirky error recovery
 380 static const ushort tag_list_quirk_block[] = {
 381     ID_LI,
 382     ID_DD,
 383     0
 384 };
 385
 386
 387 static const ushort tag_list_select[] = {
 388     ID_TEXT,
 389     ID_OPTGROUP,
 390     ID_OPTION,
 391     ID_COMMENT,
 392     ID_SCRIPT,
 393     0
 394 };
 395
 396 static const ushort tag_list_frame[] = {
 397     ID_FRAMESET,
 398     ID_FRAME,
 399     ID_NOFRAMES,
 400     ID_COMMENT,
 401     0
 402 };
 403
 404 static const ushort tag_list_head[] = {
 405     ID_SCRIPT,
 406     ID_STYLE,
 407     ID_META,
 408     ID_LINK,
 409     ID_TITLE,
 410     ID_ISINDEX,
 411     ID_BASE,
 412     ID_COMMENT,
 413     0
 414 };
 415
 416 static bool check_array(ushort child, const ushort *tagList)
 417 {
 418     int i = 0;
 419     while(tagList[i] != 0)
 420     {
 421         if(tagList[i] == child) return true;
 422         i++;
 423     }
 424     return false;
 425 }
 426
 427
 428 static bool check_block(ushort childID, bool strict)
 429 {
 430     return check_array(childID, tag_list_block) ||
 431            (!strict && check_array(childID, tag_list_quirk_block));
 432 }
 433
 434 static bool check_inline(ushort childID, bool strict)
 435 {
 436     return check_array(childID, tag_list_inline) ||
 437            (!strict && check_array(childID, tag_list_quirk_inline));
 438 }
 439
 440 static bool check_flow(ushort childID, bool strict)
 441 {
 442     return check_block(childID, strict) || check_inline(childID, strict);
 443 }
 444
 445 bool DOM::checkChild(ushort tagID, ushort childID, bool strict)
 446 {
 447     //kDebug( 6030 ) << "checkChild: " << tagID << "/" << childID;
 448
 449     if (childID == ID_COMMENT) return true;
 450
 451     // Treat custom elements the same as <span>.
 452     if (tagID > ID_LAST_TAG)
 453         tagID = ID_SPAN;
 454     if (childID > ID_LAST_TAG)
 455         childID = ID_SPAN;
 456
 457     switch(tagID)
 458     {
 459     case ID_TT:
 460     case ID_I:
 461     case ID_B:
 462     case ID_U:
 463     case ID_S:
 464     case ID_STRIKE:
 465     case ID_BIG:
 466     case ID_SMALL:
 467     case ID_EM:
 468     case ID_STRONG:
 469     case ID_DFN:
 470     case ID_CODE:
 471     case ID_SAMP:
 472     case ID_KBD:
 473     case ID_VAR:
 474     case ID_CITE:
 475     case ID_ABBR:
 476     case ID_ACRONYM:
 477     case ID_SUB:
 478     case ID_SUP:
 479     case ID_BDO:
 480     case ID_FONT:
 481     case ID_LEGEND:
 482     case ID_Q:
 483     case ID_A:
 484     case ID_NOBR:
 485     case ID_WBR:
 486         // %inline *
 487         return check_inline(childID, strict) || check_block(childID, strict);
 488     case ID_P:
 489         // P: %inline *
 490         return check_inline(childID, strict) ||
 491                (!strict && childID == ID_TABLE );
 492     case ID_H1:
 493     case ID_H2:
 494     case ID_H3:
 495     case ID_H4:
 496     case ID_H5:
 497     case ID_H6:
 498         // %inline *
 499         return check_inline(childID, strict) ||
 500                (!strict && check_block(childID, true) && (childID < ID_H1 || childID > ID_H6));
 501     case ID_BASEFONT:
 502     case ID_BR:
 503     case ID_AREA:
 504     case ID_LINK:
 505     case ID_IMAGE:
 506     case ID_IMG:
 507     case ID_PARAM:
 508     case ID_HR:
 509     case ID_INPUT:
 510     case ID_COL:
 511     case ID_FRAME:
 512     case ID_ISINDEX:
 513     case ID_BASE:
 514     case ID_META:
 515     case ID_COMMENT:
 516         // BASEFONT: EMPTY
 517         return false;
 518     case ID_BODY:
 519         // BODY: %block | SCRIPT (but even strict sites expect %flow)
 520         return check_flow(childID, strict);
 521     case ID_ADDRESS:
 522         // ADDRESS: %inline *
 523         return check_inline(childID, strict) ||
 524                (!strict && childID == ID_P);
 525     case ID_DT:
 526         // DT: %inline *
 527         return check_inline(childID, strict) ||
 528               (!strict && check_block(childID, true) && childID != ID_DL);
 529     case ID_LI:
 530     case ID_DIV:
 531     case ID_SPAN:
 532     case ID_ILAYER:
 533     case ID_LAYER:
 534     case ID_CENTER:
 535     case ID_BLOCKQUOTE:
 536     case ID_INS:
 537     case ID_DEL:
 538     case ID_DD:
 539     case ID_TH:
 540     case ID_TD:
 541     case ID_IFRAME:
 542     case ID_NOFRAMES:
 543     case ID_NOSCRIPT:
 544     case ID_CAPTION:
 545     case ID_MARQUEE:
 546     case ID_CANVAS:
 547         // DIV: %flow *
 548         return check_flow(childID, strict);
 549     case ID_MAP:
 550         // MAP: ( %block | AREA ) (but "prose" in HTML5)
 551         return check_flow(childID, true) || childID == ID_AREA ||
 552                (!strict && childID == ID_SCRIPT);
 553     case ID_OBJECT:
 554     case ID_EMBED:
 555     case ID_APPLET:
 556         // OBJECT: %flow | PARAM *
 557         return check_flow(childID, true) || childID == ID_PARAM;
 558     case ID_AUDIO:
 559     case ID_VIDEO:
 560         return check_flow(childID, true) || childID == ID_SOURCE;
 561     case ID_PRE:
 562     case ID_XMP:
 563     case ID_PLAINTEXT:
 564     case ID_LISTING:
 565         // PRE: %flow * - _5
 566         return check_flow(childID, true);
 567     case ID_DL:
 568         // DL: DT | DD +
 569         return (childID == ID_DT || childID == ID_DD || check_flow(childID, strict));
 570     case ID_OL:
 571     case ID_UL:
 572     case ID_DIR:
 573     case ID_MENU:
 574         // OL: LI +
 575         // For DIR and MENU, the DTD says - %block, but it contradicts spec language..
 576         return (childID == ID_LI || check_flow(childID, strict));
 577     case ID_FORM:
 578         // FORM: %flow * - FORM
 579         return check_flow(childID, strict);
 580     case ID_LABEL:
 581         // LABEL: %inline * - LABEL
 582         return check_inline(childID, strict) ||
 583                (!strict && check_block(childID, true));
 584     case ID_KEYGEN:
 585         // KEYGEN does not really allow any children
 586         // from outside, just need this to be able
 587         // to add the keylengths ourself
 588         // Yes, consider it a hack (Dirk)
 589     case ID_SELECT:
 590         // SELECT: _7 +
 591         return check_array(childID, tag_list_select);
 592     case ID_OPTGROUP:
 593         // OPTGROUP: OPTION +
 594         if(childID == ID_OPTION) return true;
 595         return false;
 596     case ID_OPTION:
 597     case ID_TEXTAREA:
 598     case ID_TITLE:
 599     case ID_STYLE:
 600     case ID_SCRIPT:
 601         // OPTION: TEXT
 602         if(childID == ID_TEXT) return true;
 603         return false;
 604     case ID_FIELDSET:
 605         // FIELDSET: ( TEXT , LEGEND , %flow * )
 606         if(childID == ID_TEXT) return true;
 607         if(childID == ID_LEGEND) return true;
 608         return check_flow(childID, strict);
 609     case ID_BUTTON:
 610         // BUTTON: %flow * - _8
 611         return check_flow(childID, strict);
 612     case ID_TABLE:
 613         // TABLE: ( CAPTION ? , ( COL * | COLGROUP * ) , THEAD ? , TFOOT ? , TBODY + )
 614         switch(childID)
 615         {
 616         case ID_CAPTION:
 617         case ID_COL:
 618         case ID_COLGROUP:
 619         case ID_THEAD:
 620         case ID_TFOOT:
 621         case ID_TBODY:
 622         case ID_FORM:
 623         case ID_SCRIPT:
 624             return true;
 625         default:
 626             return false;
 627         }
 628     case ID_THEAD:
 629     case ID_TFOOT:
 630     case ID_TBODY:
 631         // THEAD: TR +
 632         if(childID == ID_TR || childID == ID_SCRIPT) return true;
 633         return false;
 634     case ID_COLGROUP:
 635         // COLGROUP: COL *
 636         if(childID == ID_COL) return true;
 637         return false;
 638     case ID_TR:
 639         // TR: (TD, TH)
 640         return (childID == ID_TH || childID == ID_TD || childID == ID_SCRIPT);
 641     case ID_FRAMESET:
 642         // FRAMESET: _10
 643         return check_array(childID, tag_list_frame);
 644     case ID_HEAD:
 645         // HEAD: _11
 646         return check_array(childID, tag_list_head);
 647     case ID_HTML:
 648         // HTML: ( HEAD , COMMENT, ( BODY | ( FRAMESET & NOFRAMES ? ) ) )
 649         switch(childID)
 650         {
 651         case ID_HEAD:
 652         case ID_BODY:
 653         case ID_FRAMESET:
 654         case ID_NOFRAMES:
 655         case ID_SCRIPT:
 656             return true;
 657         default:
 658             return false;
 659         }
 660     default:
 661         kDebug( 6030 ) << "unhandled tag in dtd.cpp:checkChild(): tagID=" << tagID << "!";
 662         return false;
 663     }
 664 }
 665
 666 void DOM::addForbidden(int tagId, ushort *forbiddenTags)
 667 {
 668     switch(tagId)
 669     {
 670     case ID_A:
 671         // we allow nested anchors. The innermost one wil be taken...
 672         //forbiddenTags[ID_A]++;
 673         break;
 674     case ID_NOBR:
 675         forbiddenTags[ID_PRE]++;
 676         forbiddenTags[ID_LISTING]++;
 677         // fall through
 678     case ID_PRE:
 679     case ID_LISTING:
 680     case ID_PLAINTEXT:
 681     case ID_XMP:
 682         //forbiddenTags[ID_IMAGE]++;
 683         //forbiddenTags[ID_IMG]++;
 684         forbiddenTags[ID_OBJECT]++;
 685         forbiddenTags[ID_EMBED]++;
 686         forbiddenTags[ID_APPLET]++;
 687         // why forbid them. We can deal with them in PRE
 688         //forbiddenTags[ID_BIG]++;
 689         //forbiddenTags[ID_SMALL]++;
 690         //forbiddenTags[ID_SUB]++;
 691         //forbiddenTags[ID_SUP]++;
 692         forbiddenTags[ID_BASEFONT]++;
 693         break;
 694     case ID_LABEL:
 695         forbiddenTags[ID_LABEL]++;
 696         break;
 697     case ID_BUTTON:
 698         forbiddenTags[ID_A]++;
 699         forbiddenTags[ID_INPUT]++;
 700         forbiddenTags[ID_SELECT]++;
 701         forbiddenTags[ID_TEXTAREA]++;
 702         forbiddenTags[ID_LABEL]++;
 703         forbiddenTags[ID_BUTTON]++;
 704         forbiddenTags[ID_FORM]++;
 705         forbiddenTags[ID_ISINDEX]++;
 706         forbiddenTags[ID_FIELDSET]++;
 707         forbiddenTags[ID_IFRAME]++;
 708         break;
 709     default:
 710         break;
 711     }
 712 }
 713
 714 void DOM::removeForbidden(int tagId, ushort *forbiddenTags)
 715 {
 716     switch(tagId)
 717     {
 718     case ID_A:
 719         //forbiddenTags[ID_A]--;
 720         break;
 721     case ID_NOBR:
 722         forbiddenTags[ID_PRE]--;
 723         forbiddenTags[ID_LISTING]--;
 724         // fall through
 725     case ID_PRE:
 726     case ID_LISTING:
 727     case ID_XMP:
 728     case ID_PLAINTEXT:
 729         //forbiddenTags[ID_IMAGE]--;
 730         //forbiddenTags[ID_IMG]--;
 731         forbiddenTags[ID_OBJECT]--;
 732         forbiddenTags[ID_EMBED]--;
 733         forbiddenTags[ID_APPLET]--;
 734         //forbiddenTags[ID_BIG]--;
 735         //forbiddenTags[ID_SMALL]--;
 736         //forbiddenTags[ID_SUB]--;
 737         //forbiddenTags[ID_SUP]--;
 738         forbiddenTags[ID_BASEFONT]--;
 739         break;
 740     case ID_LABEL:
 741         forbiddenTags[ID_LABEL]--;
 742         break;
 743     case ID_BUTTON:
 744         forbiddenTags[ID_A]--;
 745         forbiddenTags[ID_INPUT]--;
 746         forbiddenTags[ID_SELECT]--;
 747         forbiddenTags[ID_TEXTAREA]--;
 748         forbiddenTags[ID_LABEL]--;
 749         forbiddenTags[ID_BUTTON]--;
 750         forbiddenTags[ID_FORM]--;
 751         forbiddenTags[ID_ISINDEX]--;
 752         forbiddenTags[ID_FIELDSET]--;
 753         forbiddenTags[ID_IFRAME]--;
 754         break;
 755     default:
 756         break;
 757     }
 758 }
 759