DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (27a812186ff4)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsHtml5TreeOperation.h"
#include "nsContentUtils.h"
#include "nsDocElementCreatedNotificationRunner.h"
#include "nsNodeUtils.h"
#include "nsAttrName.h"
#include "nsHtml5TreeBuilder.h"
#include "nsIDOMMutationEvent.h"
#include "mozAutoDocUpdate.h"
#include "nsBindingManager.h"
#include "nsXBLBinding.h"
#include "nsHtml5DocumentMode.h"
#include "nsHtml5HtmlAttributes.h"
#include "nsContentCreatorFunctions.h"
#include "nsIScriptElement.h"
#include "nsIDTD.h"
#include "nsISupportsImpl.h"
#include "nsIDOMHTMLFormElement.h"
#include "nsIFormControl.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsIDOMDocumentType.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
#include "nsIMutationObserver.h"
#include "nsIFormProcessor.h"
#include "nsIServiceManager.h"
#include "nsEscape.h"
#include "mozilla/dom/Comment.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/HTMLTemplateElement.h"
#include "nsHtml5SVGLoadDispatcher.h"
#include "nsIURI.h"
#include "nsIProtocolHandler.h"
#include "nsNetUtil.h"
#include "nsIHTMLDocument.h"
#include "mozilla/Likely.h"
#include "nsTextNode.h"

using namespace mozilla;

static NS_DEFINE_CID(kFormProcessorCID, NS_FORMPROCESSOR_CID);

/**
 * Helper class that opens a notification batch if the current doc
 * is different from the executor doc.
 */
class MOZ_STACK_CLASS nsHtml5OtherDocUpdate {
  public:
    nsHtml5OtherDocUpdate(nsIDocument* aCurrentDoc, nsIDocument* aExecutorDoc)
    {
      NS_PRECONDITION(aCurrentDoc, "Node has no doc?");
      NS_PRECONDITION(aExecutorDoc, "Executor has no doc?");
      if (MOZ_LIKELY(aCurrentDoc == aExecutorDoc)) {
        mDocument = nullptr;
      } else {
        mDocument = aCurrentDoc;
        aCurrentDoc->BeginUpdate(UPDATE_CONTENT_MODEL);        
      }
    }

    ~nsHtml5OtherDocUpdate()
    {
      if (MOZ_UNLIKELY(mDocument)) {
        mDocument->EndUpdate(UPDATE_CONTENT_MODEL);
      }
    }
  private:
    nsIDocument* mDocument;
};

nsHtml5TreeOperation::nsHtml5TreeOperation()
#ifdef DEBUG
 : mOpCode(eTreeOpUninitialized)
#endif
{
  MOZ_COUNT_CTOR(nsHtml5TreeOperation);
}

nsHtml5TreeOperation::~nsHtml5TreeOperation()
{
  MOZ_COUNT_DTOR(nsHtml5TreeOperation);
  NS_ASSERTION(mOpCode != eTreeOpUninitialized, "Uninitialized tree op.");
  switch(mOpCode) {
    case eTreeOpAddAttributes:
      delete mTwo.attributes;
      break;
    case eTreeOpCreateElementNetwork:
    case eTreeOpCreateElementNotNetwork:
      delete mThree.attributes;
      break;
    case eTreeOpAppendDoctypeToDocument:
      delete mTwo.stringPair;
      break;
    case eTreeOpFosterParentText:
    case eTreeOpAppendText:
    case eTreeOpAppendComment:
    case eTreeOpAppendCommentToDocument:
    case eTreeOpAddViewSourceHref:
      delete[] mTwo.unicharPtr;
      break;
    case eTreeOpSetDocumentCharset:
    case eTreeOpNeedsCharsetSwitchTo:
      delete[] mOne.charPtr;
      break;
    case eTreeOpProcessOfflineManifest:
      nsMemory::Free(mOne.unicharPtr);
      break;
    default: // keep the compiler happy
      break;
  }
}

nsresult
nsHtml5TreeOperation::AppendTextToTextNode(const char16_t* aBuffer,
                                           uint32_t aLength,
                                           nsIContent* aTextNode,
                                           nsHtml5DocumentBuilder* aBuilder)
{
  NS_PRECONDITION(aTextNode, "Got null text node.");

  if (aBuilder->HaveNotified(aTextNode)) {
    // This text node has already been notified on, so it's necessary to
    // notify on the append
    nsresult rv = NS_OK;
    uint32_t oldLength = aTextNode->TextLength();
    CharacterDataChangeInfo info = {
      true,
      oldLength,
      oldLength,
      aLength
    };
    nsNodeUtils::CharacterDataWillChange(aTextNode, &info);

    rv = aTextNode->AppendText(aBuffer, aLength, false);
    NS_ENSURE_SUCCESS(rv, rv);

    nsNodeUtils::CharacterDataChanged(aTextNode, &info);
    return rv;
  }

  return aTextNode->AppendText(aBuffer, aLength, false);
}


nsresult
nsHtml5TreeOperation::AppendText(const char16_t* aBuffer,
                                 uint32_t aLength,
                                 nsIContent* aParent,
                                 nsHtml5DocumentBuilder* aBuilder)
{
  nsresult rv = NS_OK;
  nsIContent* lastChild = aParent->GetLastChild();
  if (lastChild && lastChild->IsNodeOfType(nsINode::eTEXT)) {
    nsHtml5OtherDocUpdate update(aParent->OwnerDoc(),
                                 aBuilder->GetDocument());
    return AppendTextToTextNode(aBuffer, 
                                aLength, 
                                lastChild, 
                                aBuilder);
  }

  nsRefPtr<nsTextNode> text = new nsTextNode(aBuilder->GetNodeInfoManager());
  NS_ASSERTION(text, "Infallible malloc failed?");
  rv = text->SetText(aBuffer, aLength, false);
  NS_ENSURE_SUCCESS(rv, rv);

  return Append(text, aParent, aBuilder);
}

nsresult
nsHtml5TreeOperation::Append(nsIContent* aNode,
                             nsIContent* aParent,
                             nsHtml5DocumentBuilder* aBuilder)
{
  nsresult rv = NS_OK;
  nsIDocument* executorDoc = aBuilder->GetDocument();
  NS_ASSERTION(executorDoc, "Null doc on executor");
  nsIDocument* parentDoc = aParent->OwnerDoc();
  NS_ASSERTION(parentDoc, "Null owner doc on old node.");

  if (MOZ_LIKELY(executorDoc == parentDoc)) {
    // the usual case. the parent is in the parser's doc
    rv = aParent->AppendChildTo(aNode, false);
    if (NS_SUCCEEDED(rv)) {
      aBuilder->PostPendingAppendNotification(aParent, aNode);
    }
    return rv;
  }

  // The parent has been moved to another doc
  parentDoc->BeginUpdate(UPDATE_CONTENT_MODEL);

  uint32_t childCount = aParent->GetChildCount();
  rv = aParent->AppendChildTo(aNode, false);
  if (NS_SUCCEEDED(rv)) {
    nsNodeUtils::ContentAppended(aParent, aNode, childCount);
  }
  parentDoc->EndUpdate(UPDATE_CONTENT_MODEL);
  return rv;
}

nsresult
nsHtml5TreeOperation::AppendToDocument(nsIContent* aNode,
                                       nsHtml5DocumentBuilder* aBuilder)
{
  nsresult rv = NS_OK;
  aBuilder->FlushPendingAppendNotifications();
  nsIDocument* doc = aBuilder->GetDocument();
  uint32_t childCount = doc->GetChildCount();
  rv = doc->AppendChildTo(aNode, false);
  if (rv == NS_ERROR_DOM_HIERARCHY_REQUEST_ERR) {
    return NS_OK;
  }
  NS_ENSURE_SUCCESS(rv, rv);
  nsNodeUtils::ContentInserted(doc, aNode, childCount);

  NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
               "Someone forgot to block scripts");
  if (aNode->IsElement()) {
    nsContentUtils::AddScriptRunner(
        new nsDocElementCreatedNotificationRunner(doc));
  }
  return rv;
}

static bool
IsElementOrTemplateContent(nsINode* aNode) {
  if (aNode) {
    if (aNode->IsElement()) {
      return true;
    } else if (aNode->NodeType() == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {
      // Check if the node is a template content.
      mozilla::dom::DocumentFragment* frag =
        static_cast<mozilla::dom::DocumentFragment*>(aNode);
      nsIContent* fragHost = frag->GetHost();
      if (fragHost && nsNodeUtils::IsTemplateElement(fragHost)) {
        return true;
      }
    }
  }
  return false;
}

void
nsHtml5TreeOperation::Detach(nsIContent* aNode, nsHtml5DocumentBuilder* aBuilder)
{
  aBuilder->FlushPendingAppendNotifications();
  nsCOMPtr<nsINode> parent = aNode->GetParentNode();
  if (parent) {
    nsHtml5OtherDocUpdate update(parent->OwnerDoc(),
        aBuilder->GetDocument());
    int32_t pos = parent->IndexOf(aNode);
    NS_ASSERTION((pos >= 0), "Element not found as child of its parent");
    parent->RemoveChildAt(pos, true);
  }
}

nsresult
nsHtml5TreeOperation::AppendChildrenToNewParent(nsIContent* aNode,
                                                nsIContent* aParent,
                                                nsHtml5DocumentBuilder* aBuilder)
{
  aBuilder->FlushPendingAppendNotifications();

  nsHtml5OtherDocUpdate update(aParent->OwnerDoc(),
                               aBuilder->GetDocument());

  uint32_t childCount = aParent->GetChildCount();
  bool didAppend = false;
  while (aNode->HasChildren()) {
    nsCOMPtr<nsIContent> child = aNode->GetFirstChild();
    aNode->RemoveChildAt(0, true);
    nsresult rv = aParent->AppendChildTo(child, false);
    NS_ENSURE_SUCCESS(rv, rv);
    didAppend = true;
  }
  if (didAppend) {
    nsNodeUtils::ContentAppended(aParent, aParent->GetChildAt(childCount),
                                 childCount);
  }
  return NS_OK;
}

nsresult
nsHtml5TreeOperation::FosterParent(nsIContent* aNode,
                                   nsIContent* aParent,
                                   nsIContent* aTable,
                                   nsHtml5DocumentBuilder* aBuilder)
{
  nsIContent* foster = aTable->GetParent();

  if (IsElementOrTemplateContent(foster)) {
    aBuilder->FlushPendingAppendNotifications();

    nsHtml5OtherDocUpdate update(foster->OwnerDoc(),
                                 aBuilder->GetDocument());

    uint32_t pos = foster->IndexOf(aTable);
    nsresult rv = foster->InsertChildAt(aNode, pos, false);
    NS_ENSURE_SUCCESS(rv, rv);
    nsNodeUtils::ContentInserted(foster, aNode, pos);
    return rv;
  }

  return Append(aNode, aParent, aBuilder);
}

nsresult
nsHtml5TreeOperation::AddAttributes(nsIContent* aNode,
                                    nsHtml5HtmlAttributes* aAttributes,
                                    nsHtml5DocumentBuilder* aBuilder)
{
  dom::Element* node = aNode->AsElement();
  nsHtml5OtherDocUpdate update(node->OwnerDoc(),
                               aBuilder->GetDocument());

  int32_t len = aAttributes->getLength();
  for (int32_t i = len; i > 0;) {
    --i;
    // prefix doesn't need regetting. it is always null or a static atom
    // local name is never null
    nsCOMPtr<nsIAtom> localName =
      Reget(aAttributes->getLocalNameNoBoundsCheck(i));
    int32_t nsuri = aAttributes->getURINoBoundsCheck(i);
    if (!node->HasAttr(nsuri, localName)) {
      // prefix doesn't need regetting. it is always null or a static atom
      // local name is never null
      node->SetAttr(nsuri,
                    localName,
                    aAttributes->getPrefixNoBoundsCheck(i),
                    *(aAttributes->getValueNoBoundsCheck(i)),
                    true);
      // XXX what to do with nsresult?
    }
  }
  return NS_OK;
}


nsIContent*
nsHtml5TreeOperation::CreateElement(int32_t aNs,
                                    nsIAtom* aName,
                                    nsHtml5HtmlAttributes* aAttributes,
                                    mozilla::dom::FromParser aFromParser,
                                    nsHtml5DocumentBuilder* aBuilder)
{
  bool isKeygen = (aName == nsHtml5Atoms::keygen && aNs == kNameSpaceID_XHTML);
  if (MOZ_UNLIKELY(isKeygen)) {
    aName = nsHtml5Atoms::select;
  }

  nsCOMPtr<dom::Element> newContent;
  nsCOMPtr<nsINodeInfo> nodeInfo = aBuilder->GetNodeInfoManager()->
    GetNodeInfo(aName, nullptr, aNs, nsIDOMNode::ELEMENT_NODE);
  NS_ASSERTION(nodeInfo, "Got null nodeinfo.");
  NS_NewElement(getter_AddRefs(newContent),
                nodeInfo.forget(),
                aFromParser);
  NS_ASSERTION(newContent, "Element creation created null pointer.");

  aBuilder->HoldElement(newContent);

  if (MOZ_UNLIKELY(aName == nsHtml5Atoms::style || aName == nsHtml5Atoms::link)) {
    nsCOMPtr<nsIStyleSheetLinkingElement> ssle(do_QueryInterface(newContent));
    if (ssle) {
      ssle->InitStyleLinkElement(false);
      ssle->SetEnableUpdates(false);
    }
  } else if (MOZ_UNLIKELY(isKeygen)) {
    // Adapted from CNavDTD
    nsresult rv;
    nsCOMPtr<nsIFormProcessor> theFormProcessor =
      do_GetService(kFormProcessorCID, &rv);
    if (NS_FAILED(rv)) {
      return newContent;
    }

    nsTArray<nsString> theContent;
    nsAutoString theAttribute;

    (void) theFormProcessor->ProvideContent(NS_LITERAL_STRING("select"),
                                            theContent,
                                            theAttribute);

    newContent->SetAttr(kNameSpaceID_None,
                        nsGkAtoms::moztype,
                        nullptr,
                        theAttribute,
                        false);

    nsCOMPtr<nsINodeInfo> optionNodeInfo =
      aBuilder->GetNodeInfoManager()->GetNodeInfo(nsHtml5Atoms::option,
                                                  nullptr,
                                                  kNameSpaceID_XHTML,
                                                  nsIDOMNode::ELEMENT_NODE);

    for (uint32_t i = 0; i < theContent.Length(); ++i) {
      nsCOMPtr<dom::Element> optionElt;
      nsCOMPtr<nsINodeInfo> ni = optionNodeInfo;
      NS_NewElement(getter_AddRefs(optionElt),
                    ni.forget(),
                    aFromParser);
      nsRefPtr<nsTextNode> optionText =
        new nsTextNode(aBuilder->GetNodeInfoManager());
      (void) optionText->SetText(theContent[i], false);
      optionElt->AppendChildTo(optionText, false);
      newContent->AppendChildTo(optionElt, false);
      newContent->DoneAddingChildren(false);
    }
  }

  if (!aAttributes) {
    return newContent;
  }

  int32_t len = aAttributes->getLength();
  for (int32_t i = len; i > 0;) {
    --i;
    // prefix doesn't need regetting. it is always null or a static atom
    // local name is never null
    nsCOMPtr<nsIAtom> localName =
      Reget(aAttributes->getLocalNameNoBoundsCheck(i));
    nsCOMPtr<nsIAtom> prefix = aAttributes->getPrefixNoBoundsCheck(i);
    int32_t nsuri = aAttributes->getURINoBoundsCheck(i);

    if (aNs == kNameSpaceID_XHTML &&
        nsHtml5Atoms::a == aName &&
        nsHtml5Atoms::name == localName) {
      // This is an HTML5-incompliant Geckoism.
      // Remove when fixing bug 582361
      NS_ConvertUTF16toUTF8 cname(*(aAttributes->getValueNoBoundsCheck(i)));
      NS_ConvertUTF8toUTF16 uv(nsUnescape(cname.BeginWriting()));
      newContent->SetAttr(nsuri,
                          localName,
                          prefix,
                          uv,
                          false);
    } else {
      nsString& value = *(aAttributes->getValueNoBoundsCheck(i));
      newContent->SetAttr(nsuri,
                          localName,
                          prefix,
                          value,
                          false);

      // Custom element prototype swizzling may be needed if there is an
      // "is" attribute.
      if (kNameSpaceID_None == nsuri && !prefix && nsGkAtoms::is == localName) {
        ErrorResult errorResult;
        newContent->OwnerDoc()->SwizzleCustomElement(newContent,
                                                     value,
                                                     newContent->GetNameSpaceID(),
                                                     errorResult);
      }
    }
  }
  return newContent;
}

void
nsHtml5TreeOperation::SetFormElement(nsIContent* aNode, nsIContent* aParent)
{
  nsCOMPtr<nsIFormControl> formControl(do_QueryInterface(aNode));
  nsCOMPtr<nsIDOMHTMLImageElement> domImageElement = do_QueryInterface(aNode);
  // NS_ASSERTION(formControl, "Form-associated element did not implement nsIFormControl.");
  // TODO: uncomment the above line when <keygen> (bug 101019) is supported by Gecko
  nsCOMPtr<nsIDOMHTMLFormElement> formElement(do_QueryInterface(aParent));
  NS_ASSERTION(formElement, "The form element doesn't implement nsIDOMHTMLFormElement.");
  // avoid crashing on <keygen>
  if (formControl &&
      !aNode->HasAttr(kNameSpaceID_None, nsGkAtoms::form)) {
    formControl->SetForm(formElement);
  } else if (domImageElement) {
    nsRefPtr<dom::HTMLImageElement> imageElement =
      static_cast<dom::HTMLImageElement*>(domImageElement.get());
    MOZ_ASSERT(imageElement);
    imageElement->SetForm(formElement);
  }
}

nsresult
nsHtml5TreeOperation::AppendIsindexPrompt(nsIContent* parent, nsHtml5DocumentBuilder* aBuilder)
{
  nsXPIDLString prompt;
  nsresult rv =
      nsContentUtils::GetLocalizedString(nsContentUtils::eFORMS_PROPERTIES,
                                         "IsIndexPromptWithSpace", prompt);
  uint32_t len = prompt.Length();
  if (NS_FAILED(rv)) {
    return rv;
  }
  if (!len) {
    // Don't bother appending a zero-length text node.
    return NS_OK;
  }
  return AppendText(prompt.BeginReading(), len, parent, aBuilder);
}

nsresult
nsHtml5TreeOperation::FosterParentText(nsIContent* aStackParent,
                                       char16_t* aBuffer,
                                       uint32_t aLength,
                                       nsIContent* aTable,
                                       nsHtml5DocumentBuilder* aBuilder)
{
  nsresult rv = NS_OK;
  nsIContent* foster = aTable->GetParent();

  if (IsElementOrTemplateContent(foster)) {
    aBuilder->FlushPendingAppendNotifications();

    nsHtml5OtherDocUpdate update(foster->OwnerDoc(),
                                 aBuilder->GetDocument());

    uint32_t pos = foster->IndexOf(aTable);

    nsIContent* previousSibling = aTable->GetPreviousSibling();
    if (previousSibling && previousSibling->IsNodeOfType(nsINode::eTEXT)) {
      return AppendTextToTextNode(aBuffer,
                                  aLength,
                                  previousSibling,
                                  aBuilder);
    }

    nsRefPtr<nsTextNode> text =
      new nsTextNode(aBuilder->GetNodeInfoManager());
    NS_ASSERTION(text, "Infallible malloc failed?");
    rv = text->SetText(aBuffer, aLength, false);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = foster->InsertChildAt(text, pos, false);
    NS_ENSURE_SUCCESS(rv, rv);
    nsNodeUtils::ContentInserted(foster, text, pos);
    return rv;
  }

  return AppendText(aBuffer, aLength, aStackParent, aBuilder);
}

nsresult
nsHtml5TreeOperation::AppendComment(nsIContent* aParent,
                                    char16_t* aBuffer,
                                    int32_t aLength,
                                    nsHtml5DocumentBuilder* aBuilder)
{
  nsRefPtr<dom::Comment> comment =
    new dom::Comment(aBuilder->GetNodeInfoManager());
  NS_ASSERTION(comment, "Infallible malloc failed?");
  nsresult rv = comment->SetText(aBuffer, aLength, false);
  NS_ENSURE_SUCCESS(rv, rv);

  return Append(comment, aParent, aBuilder);
}

nsresult
nsHtml5TreeOperation::AppendCommentToDocument(char16_t* aBuffer,
                                              int32_t aLength,
                                              nsHtml5DocumentBuilder* aBuilder)
{
  nsRefPtr<dom::Comment> comment =
    new dom::Comment(aBuilder->GetNodeInfoManager());
  NS_ASSERTION(comment, "Infallible malloc failed?");
  nsresult rv = comment->SetText(aBuffer, aLength, false);
  NS_ENSURE_SUCCESS(rv, rv);

  return AppendToDocument(comment, aBuilder);
}

nsresult
nsHtml5TreeOperation::AppendDoctypeToDocument(nsIAtom* aName,
                                              const nsAString& aPublicId,
                                              const nsAString& aSystemId,
                                              nsHtml5DocumentBuilder* aBuilder)
{
  // Adapted from nsXMLContentSink
  // Create a new doctype node
  nsCOMPtr<nsIDOMDocumentType> docType;
  nsAutoString voidString;
  voidString.SetIsVoid(true);
  NS_NewDOMDocumentType(getter_AddRefs(docType),
                        aBuilder->GetNodeInfoManager(),
                        aName,
                        aPublicId,
                        aSystemId,
                        voidString);
  NS_ASSERTION(docType, "Doctype creation failed.");
  nsCOMPtr<nsIContent> asContent = do_QueryInterface(docType);
  return AppendToDocument(asContent, aBuilder);
}

nsIContent*
nsHtml5TreeOperation::GetDocumentFragmentForTemplate(nsIContent* aNode)
{
  dom::HTMLTemplateElement* tempElem =
    static_cast<dom::HTMLTemplateElement*>(aNode);
  nsRefPtr<dom::DocumentFragment> frag = tempElem->Content();
  return frag;
}

void
nsHtml5TreeOperation::PreventScriptExecution(nsIContent* aNode)
{
  nsCOMPtr<nsIScriptElement> sele = do_QueryInterface(aNode);
  MOZ_ASSERT(sele);
  sele->PreventExecution();
}

void
nsHtml5TreeOperation::DoneAddingChildren(nsIContent* aNode,
                                         nsHtml5DocumentBuilder* aBuilder)
{
  aNode->DoneAddingChildren(aBuilder->HaveNotified(aNode));
}

void
nsHtml5TreeOperation::DoneCreatingElement(nsIContent* aNode)
{
  aNode->DoneCreatingElement();
}

void
nsHtml5TreeOperation::SvgLoad(nsIContent* aNode)
{
  nsCOMPtr<nsIRunnable> event = new nsHtml5SVGLoadDispatcher(aNode);
  if (NS_FAILED(NS_DispatchToMainThread(event))) {
    NS_WARNING("failed to dispatch svg load dispatcher");
  }
}

void
nsHtml5TreeOperation::MarkMalformedIfScript(nsIContent* aNode)
{
  nsCOMPtr<nsIScriptElement> sele = do_QueryInterface(aNode);
  if (sele) {
    // Make sure to serialize this script correctly, for nice round tripping.
    sele->SetIsMalformed();
  }
}

nsresult
nsHtml5TreeOperation::Perform(nsHtml5TreeOpExecutor* aBuilder,
                              nsIContent** aScriptElement)
{
  switch(mOpCode) {
    case eTreeOpAppend: {
      nsIContent* node = *(mOne.node);
      nsIContent* parent = *(mTwo.node);
      return Append(node, parent, aBuilder);
    }
    case eTreeOpDetach: {
      nsIContent* node = *(mOne.node);
      Detach(node, aBuilder);
      return NS_OK;
    }
    case eTreeOpAppendChildrenToNewParent: {
      nsCOMPtr<nsIContent> node = *(mOne.node);
      nsIContent* parent = *(mTwo.node);
      return AppendChildrenToNewParent(node, parent, aBuilder);
    }
    case eTreeOpFosterParent: {
      nsIContent* node = *(mOne.node);
      nsIContent* parent = *(mTwo.node);
      nsIContent* table = *(mThree.node);
      return FosterParent(node, parent, table, aBuilder);
    }
    case eTreeOpAppendToDocument: {
      nsIContent* node = *(mOne.node);
      return AppendToDocument(node, aBuilder);
    }
    case eTreeOpAddAttributes: {
      nsIContent* node = *(mOne.node);
      nsHtml5HtmlAttributes* attributes = mTwo.attributes;
      return AddAttributes(node, attributes, aBuilder);
    }
    case eTreeOpCreateElementNetwork:
    case eTreeOpCreateElementNotNetwork: {
      nsIContent** target = mOne.node;
      int32_t ns = mFour.integer;
      nsCOMPtr<nsIAtom> name = Reget(mTwo.atom);
      nsHtml5HtmlAttributes* attributes = mThree.attributes;

      *target = CreateElement(ns,
                              name,
                              attributes,
                              mOpCode == eTreeOpCreateElementNetwork ?
                                dom::FROM_PARSER_NETWORK :
                                dom::FROM_PARSER_DOCUMENT_WRITE,
                              aBuilder);
      return NS_OK;
    }
    case eTreeOpSetFormElement: {
      nsIContent* node = *(mOne.node);
      nsIContent* parent = *(mTwo.node);
      SetFormElement(node, parent);
      return NS_OK;
    }
    case eTreeOpAppendText: {
      nsIContent* parent = *mOne.node;
      char16_t* buffer = mTwo.unicharPtr;
      uint32_t length = mFour.integer;
      return AppendText(buffer, length, parent, aBuilder);
    }
    case eTreeOpAppendIsindexPrompt: {
      nsIContent* parent = *mOne.node;
      return AppendIsindexPrompt(parent, aBuilder);
    }
    case eTreeOpFosterParentText: {
      nsIContent* stackParent = *mOne.node;
      char16_t* buffer = mTwo.unicharPtr;
      uint32_t length = mFour.integer;
      nsIContent* table = *mThree.node;
      return FosterParentText(stackParent, buffer, length, table, aBuilder);
    }
    case eTreeOpAppendComment: {
      nsIContent* parent = *mOne.node;
      char16_t* buffer = mTwo.unicharPtr;
      int32_t length = mFour.integer;
      return AppendComment(parent, buffer, length, aBuilder);
    }
    case eTreeOpAppendCommentToDocument: {
      char16_t* buffer = mTwo.unicharPtr;
      int32_t length = mFour.integer;
      return AppendCommentToDocument(buffer, length, aBuilder);
    }
    case eTreeOpAppendDoctypeToDocument: {
      nsCOMPtr<nsIAtom> name = Reget(mOne.atom);
      nsHtml5TreeOperationStringPair* pair = mTwo.stringPair;
      nsString publicId;
      nsString systemId;
      pair->Get(publicId, systemId);
      return AppendDoctypeToDocument(name, publicId, systemId, aBuilder);
    }
    case eTreeOpGetDocumentFragmentForTemplate: {
      nsIContent* node = *(mOne.node);
      *mTwo.node = GetDocumentFragmentForTemplate(node);
      return NS_OK;
    }
    case eTreeOpMarkAsBroken: {
      return mOne.result;
    }
    case eTreeOpRunScript: {
      nsIContent* node = *(mOne.node);
      nsAHtml5TreeBuilderState* snapshot = mTwo.state;
      if (snapshot) {
        aBuilder->InitializeDocWriteParserState(snapshot, mFour.integer);
      }
      *aScriptElement = node;
      return NS_OK;
    }
    case eTreeOpRunScriptAsyncDefer: {
      nsIContent* node = *(mOne.node);
      aBuilder->RunScript(node);
      return NS_OK;
    }
    case eTreeOpPreventScriptExecution: {
      nsIContent* node = *(mOne.node);
      PreventScriptExecution(node);
      return NS_OK;
    }
    case eTreeOpDoneAddingChildren: {
      nsIContent* node = *(mOne.node);
      node->DoneAddingChildren(aBuilder->HaveNotified(node));
      return NS_OK;
    }
    case eTreeOpDoneCreatingElement: {
      nsIContent* node = *(mOne.node);
      DoneCreatingElement(node);
      return NS_OK;
    }
    case eTreeOpFlushPendingAppendNotifications: {
      aBuilder->FlushPendingAppendNotifications();
      return NS_OK;
    }
    case eTreeOpSetDocumentCharset: {
      char* str = mOne.charPtr;
      int32_t charsetSource = mFour.integer;
      nsDependentCString dependentString(str);
      aBuilder->SetDocumentCharsetAndSource(dependentString, charsetSource);
      return NS_OK;
    }
    case eTreeOpNeedsCharsetSwitchTo: {
      char* str = mOne.charPtr;
      int32_t charsetSource = mFour.integer;
      int32_t lineNumber = mTwo.integer;
      aBuilder->NeedsCharsetSwitchTo(str, charsetSource, (uint32_t)lineNumber);
      return NS_OK;
    }
    case eTreeOpUpdateStyleSheet: {
      nsIContent* node = *(mOne.node);
      aBuilder->FlushPendingAppendNotifications();
      aBuilder->UpdateStyleSheet(node);
      return NS_OK;
    }
    case eTreeOpProcessMeta: {
      nsIContent* node = *(mOne.node);
      return aBuilder->ProcessMETATag(node);
    }
    case eTreeOpProcessOfflineManifest: {
      char16_t* str = mOne.unicharPtr;
      nsDependentString dependentString(str);
      aBuilder->ProcessOfflineManifest(dependentString);
      return NS_OK;
    }
    case eTreeOpMarkMalformedIfScript: {
      nsIContent* node = *(mOne.node);
      MarkMalformedIfScript(node);
      return NS_OK;
    }
    case eTreeOpStreamEnded: {
      aBuilder->DidBuildModel(false); // this causes a notifications flush anyway
      return NS_OK;
    }
    case eTreeOpStartLayout: {
      aBuilder->StartLayout(); // this causes a notification flush anyway
      return NS_OK;
    }
    case eTreeOpDocumentMode: {
      aBuilder->SetDocumentMode(mOne.mode);
      return NS_OK;
    }
    case eTreeOpSetStyleLineNumber: {
      nsIContent* node = *(mOne.node);
      nsCOMPtr<nsIStyleSheetLinkingElement> ssle = do_QueryInterface(node);
      NS_ASSERTION(ssle, "Node didn't QI to style.");
      ssle->SetLineNumber(mFour.integer);
      return NS_OK;
    }
    case eTreeOpSetScriptLineNumberAndFreeze: {
      nsIContent* node = *(mOne.node);
      nsCOMPtr<nsIScriptElement> sele = do_QueryInterface(node);
      NS_ASSERTION(sele, "Node didn't QI to script.");
      sele->SetScriptLineNumber(mFour.integer);
      sele->FreezeUriAsyncDefer();
      return NS_OK;
    }
    case eTreeOpSvgLoad: {
      nsIContent* node = *(mOne.node);
      SvgLoad(node);
      return NS_OK;
    }
    case eTreeOpMaybeComplainAboutCharset: {
      char* msgId = mOne.charPtr;
      bool error = mTwo.integer;
      int32_t lineNumber = mThree.integer;
      aBuilder->MaybeComplainAboutCharset(msgId, error, (uint32_t)lineNumber);
      return NS_OK;
    }
    case eTreeOpAddClass: {
      nsIContent* node = *(mOne.node);
      char16_t* str = mTwo.unicharPtr;
      nsDependentString depStr(str);
      // See viewsource.css for the possible classes
      nsAutoString klass;
      node->GetAttr(kNameSpaceID_None, nsGkAtoms::_class, klass);
      if (!klass.IsEmpty()) {
        klass.Append(' ');
        klass.Append(depStr);
        node->SetAttr(kNameSpaceID_None, nsGkAtoms::_class, klass, true);
      } else {
        node->SetAttr(kNameSpaceID_None, nsGkAtoms::_class, depStr, true);
      }
      return NS_OK;
    }
    case eTreeOpAddLineNumberId: {
      nsIContent* node = *(mOne.node);
      int32_t lineNumber = mFour.integer;
      nsAutoString val(NS_LITERAL_STRING("line"));
      val.AppendInt(lineNumber);
      node->SetAttr(kNameSpaceID_None, nsGkAtoms::id, val, true);
      return NS_OK;
    }
    case eTreeOpAddViewSourceHref: {
      nsIContent* node = *mOne.node;
      char16_t* buffer = mTwo.unicharPtr;
      int32_t length = mFour.integer;

      nsDependentString relative(buffer, length);

      nsIDocument* doc = aBuilder->GetDocument();

      const nsCString& charset = doc->GetDocumentCharacterSet();
      nsCOMPtr<nsIURI> uri;
      nsresult rv = NS_NewURI(getter_AddRefs(uri),
                              relative,
                              charset.get(),
                              aBuilder->GetViewSourceBaseURI());
      NS_ENSURE_SUCCESS(rv, NS_OK);

      // Reuse the fix for bug 467852
      // URLs that execute script (e.g. "javascript:" URLs) should just be
      // ignored.  There's nothing reasonable we can do with them, and allowing
      // them to execute in the context of the view-source window presents a
      // security risk.  Just return the empty string in this case.
      bool openingExecutesScript = false;
      rv = NS_URIChainHasFlags(uri,
                               nsIProtocolHandler::URI_OPENING_EXECUTES_SCRIPT,
                               &openingExecutesScript);
      if (NS_FAILED(rv) || openingExecutesScript) {
        return NS_OK;
      }

      nsAutoCString viewSourceUrl;

      // URLs that return data (e.g. "http:" URLs) should be prefixed with
      // "view-source:".  URLs that don't return data should just be returned
      // undecorated.
      bool doesNotReturnData = false;
      rv = NS_URIChainHasFlags(uri,
                               nsIProtocolHandler::URI_DOES_NOT_RETURN_DATA,
                               &doesNotReturnData);
      NS_ENSURE_SUCCESS(rv, NS_OK);
      if (!doesNotReturnData) {
        viewSourceUrl.AssignLiteral("view-source:");
      }

      nsAutoCString spec;
      uri->GetSpec(spec);

      viewSourceUrl.Append(spec);

      nsAutoString utf16;
      CopyUTF8toUTF16(viewSourceUrl, utf16);

      node->SetAttr(kNameSpaceID_None, nsGkAtoms::href, utf16, true);
      return rv;
    }
    case eTreeOpAddError: {
      nsIContent* node = *(mOne.node);
      char* msgId = mTwo.charPtr;
      nsCOMPtr<nsIAtom> atom = Reget(mThree.atom);
      nsCOMPtr<nsIAtom> otherAtom = Reget(mFour.atom);
      // See viewsource.css for the possible classes in addition to "error".
      nsAutoString klass;
      node->GetAttr(kNameSpaceID_None, nsGkAtoms::_class, klass);
      if (!klass.IsEmpty()) {
        klass.Append(NS_LITERAL_STRING(" error"));
        node->SetAttr(kNameSpaceID_None, nsGkAtoms::_class, klass, true);
      } else {
        node->SetAttr(kNameSpaceID_None,
                      nsGkAtoms::_class,
                      NS_LITERAL_STRING("error"),
                      true);
      }

      nsresult rv;
      nsXPIDLString message;
      if (otherAtom) {
        const char16_t* params[] = { atom->GetUTF16String(),
                                      otherAtom->GetUTF16String() };
        rv = nsContentUtils::FormatLocalizedString(
          nsContentUtils::eHTMLPARSER_PROPERTIES, msgId, params, message);
        NS_ENSURE_SUCCESS(rv, NS_OK);
      } else if (atom) {
        const char16_t* params[] = { atom->GetUTF16String() };
        rv = nsContentUtils::FormatLocalizedString(
          nsContentUtils::eHTMLPARSER_PROPERTIES, msgId, params, message);
        NS_ENSURE_SUCCESS(rv, NS_OK);
      } else {
        rv = nsContentUtils::GetLocalizedString(
          nsContentUtils::eHTMLPARSER_PROPERTIES, msgId, message);
        NS_ENSURE_SUCCESS(rv, NS_OK);
      }

      nsAutoString title;
      node->GetAttr(kNameSpaceID_None, nsGkAtoms::title, title);
      if (!title.IsEmpty()) {
        title.Append('\n');
        title.Append(message);
        node->SetAttr(kNameSpaceID_None, nsGkAtoms::title, title, true);
      } else {
        node->SetAttr(kNameSpaceID_None, nsGkAtoms::title, message, true);
      }
      return rv;
    }
    default: {
      NS_NOTREACHED("Bogus tree op");
    }
  }
  return NS_OK; // keep compiler happy
}