layout/style/DocumentStyleRootIterator.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "DocumentStyleRootIterator.h"
   8
   9 #include "mozilla/dom/Element.h"
  10 #include "nsContentUtils.h"
  11
  12 namespace mozilla {
  13
  14 DocumentStyleRootIterator::DocumentStyleRootIterator(nsINode* aStyleRoot)
  15     : mPosition(0) {
  16   MOZ_COUNT_CTOR(DocumentStyleRootIterator);
  17   MOZ_ASSERT(aStyleRoot);
  18   if (aStyleRoot->IsElement()) {
  19     mStyleRoots.AppendElement(aStyleRoot->AsElement());
  20     return;
  21   }
  22
  23   dom::Document* doc = aStyleRoot->OwnerDoc();
  24   MOZ_ASSERT(doc == aStyleRoot);
  25   if (Element* root = doc->GetRootElement()) {
  26     mStyleRoots.AppendElement(root);
  27   }
  28   nsContentUtils::AppendDocumentLevelNativeAnonymousContentTo(doc, mStyleRoots);
  29 }
  30
  31 Element* DocumentStyleRootIterator::GetNextStyleRoot() {
  32   for (;;) {
  33     if (mPosition >= mStyleRoots.Length()) {
  34       return nullptr;
  35     }
  36
  37     nsIContent* next = mStyleRoots[mPosition];
  38     ++mPosition;
  39
  40     if (next->IsElement()) {
  41       return next->AsElement();
  42     }
  43   }
  44 }
  45
  46 }  // namespace mozilla