/* 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 "SMILNullType.h"

#include "mozilla/SMILValue.h"
#include "nsDebug.h"

namespace mozilla {

/*static*/
SMILNullType* SMILNullType::Singleton() {
  static SMILNullType sSingleton;
  return &sSingleton;
}

nsresult SMILNullType::Assign(SMILValue& aDest, const SMILValue& aSrc) const {
  MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
  MOZ_ASSERT(aSrc.mType == this, "Unexpected source type");
  aDest.mU = aSrc.mU;
  aDest.mType = Singleton();
  return NS_OK;
}

bool SMILNullType::IsEqual(const SMILValue& aLeft,
                           const SMILValue& aRight) const {
  MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
  MOZ_ASSERT(aLeft.mType == this, "Unexpected type for SMIL value");

  return true;  // All null-typed values are equivalent.
}

nsresult SMILNullType::Add(SMILValue& aDest, const SMILValue& aValueToAdd,
                           uint32_t aCount) const {
  MOZ_ASSERT_UNREACHABLE("Adding NULL type");
  return NS_ERROR_FAILURE;
}

nsresult SMILNullType::ComputeDistance(const SMILValue& aFrom,
                                       const SMILValue& aTo,
                                       double& aDistance) const {
  MOZ_ASSERT_UNREACHABLE("Computing distance for NULL type");
  return NS_ERROR_FAILURE;
}

nsresult SMILNullType::Interpolate(const SMILValue& aStartVal,
                                   const SMILValue& aEndVal,
                                   double aUnitDistance,
                                   SMILValue& aResult) const {
  MOZ_ASSERT_UNREACHABLE("Interpolating NULL type");
  return NS_ERROR_FAILURE;
}

}  // namespace mozilla