layout/style/FontFaceSetIterator.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
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/FontFaceSetIterator.h"
   8
   9 #include "js/Array.h"  // JS::NewArrayObject
  10
  11 namespace mozilla {
  12 namespace dom {
  13
  14 NS_IMPL_CYCLE_COLLECTION(FontFaceSetIterator, mFontFaceSet)
  15
  16 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(FontFaceSetIterator, AddRef)
  17 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(FontFaceSetIterator, Release)
  18
  19 FontFaceSetIterator::FontFaceSetIterator(FontFaceSet* aFontFaceSet,
  20                                          bool aIsKeyAndValue)
  21     : mFontFaceSet(aFontFaceSet),
  22       mNextIndex(0),
  23       mIsKeyAndValue(aIsKeyAndValue) {
  24   MOZ_COUNT_CTOR(FontFaceSetIterator);
  25 }
  26
  27 FontFaceSetIterator::~FontFaceSetIterator() {
  28   MOZ_COUNT_DTOR(FontFaceSetIterator);
  29 }
  30
  31 bool FontFaceSetIterator::WrapObject(JSContext* aCx,
  32                                      JS::Handle<JSObject*> aGivenProto,
  33                                      JS::MutableHandle<JSObject*> aReflector) {
  34   return FontFaceSetIterator_Binding::Wrap(aCx, this, aGivenProto, aReflector);
  35 }
  36
  37 void FontFaceSetIterator::Next(JSContext* aCx,
  38                                FontFaceSetIteratorResult& aResult,
  39                                ErrorResult& aRv) {
  40   if (!mFontFaceSet) {
  41     aResult.mDone = true;
  42     return;
  43   }
  44
  45   FontFace* face = mFontFaceSet->GetFontFaceAt(mNextIndex++);
  46
  47   if (!face) {
  48     aResult.mValue.setUndefined();
  49     aResult.mDone = true;
  50     mFontFaceSet = nullptr;
  51     return;
  52   }
  53
  54   JS::Rooted<JS::Value> value(aCx);
  55   if (!ToJSValue(aCx, face, &value)) {
  56     aRv.Throw(NS_ERROR_FAILURE);
  57     return;
  58   }
  59
  60   if (mIsKeyAndValue) {
  61     JS::RootedValueArray<2> values(aCx);
  62     values[0].set(value);
  63     values[1].set(value);
  64
  65     JS::Rooted<JSObject*> array(aCx);
  66     array = JS::NewArrayObject(aCx, values);
  67     if (array) {
  68       aResult.mValue.setObject(*array);
  69     }
  70   } else {
  71     aResult.mValue = value;
  72   }
  73
  74   aResult.mDone = false;
  75 }
  76
  77 }  // namespace dom
  78 }  // namespace mozilla