gecko-dev/layout/style/FontFaceSetIterator.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/dom/FontFaceSetIterator.h"

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION(FontFaceSetIterator, mFontFaceSet)

NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(FontFaceSetIterator, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(FontFaceSetIterator, Release)

FontFaceSetIterator::FontFaceSetIterator(FontFaceSet* aFontFaceSet,
                                         bool aIsKeyAndValue)
  : mFontFaceSet(aFontFaceSet)
  , mNextIndex(0)
  , mIsKeyAndValue(aIsKeyAndValue)
{
  MOZ_COUNT_CTOR(FontFaceSetIterator);
}

FontFaceSetIterator::~FontFaceSetIterator()
{
  MOZ_COUNT_DTOR(FontFaceSetIterator);
}

bool
FontFaceSetIterator::WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aGivenProto,
                                JS::MutableHandle<JSObject*> aReflector)
{
  return FontFaceSetIteratorBinding::Wrap(aCx, this, aGivenProto, aReflector);
}

void
FontFaceSetIterator::Next(JSContext* aCx, FontFaceSetIteratorResult& aResult,
                          ErrorResult& aRv)
{
  if (!mFontFaceSet) {
    aResult.mDone = true;
    return;
  }

  FontFace* face = mFontFaceSet->GetFontFaceAt(mNextIndex++);

  if (!face) {
    aResult.mValue.setUndefined();
    aResult.mDone = true;
    mFontFaceSet = nullptr;
    return;
  }

  JS::Rooted<JS::Value> value(aCx);
  if (!ToJSValue(aCx, face, &value)) {
    aRv.Throw(NS_ERROR_FAILURE);
    return;
  }

  if (mIsKeyAndValue) {
    JS::AutoValueArray<2> values(aCx);
    values[0].set(value);
    values[1].set(value);

    JS::Rooted<JSObject*> array(aCx);
    array = JS_NewArrayObject(aCx, values);
    if (array) {
      aResult.mValue.setObject(*array);
    }
  } else {
    aResult.mValue = value;
  }

  aResult.mDone = false;
}

} // namespace dom
} // namespace mozilla