dom/smil/SMILStringType.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 "SMILStringType.h"
   8
   9 #include "mozilla/SMILValue.h"
  10 #include "nsDebug.h"
  11 #include "nsString.h"
  12
  13 namespace mozilla {
  14
  15 void SMILStringType::Init(SMILValue& aValue) const {
  16   MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
  17   aValue.mU.mPtr = new nsString();
  18   aValue.mType = this;
  19 }
  20
  21 void SMILStringType::Destroy(SMILValue& aValue) const {
  22   MOZ_ASSERT(aValue.mType == this, "Unexpected SMIL value");
  23   delete static_cast<nsAString*>(aValue.mU.mPtr);
  24   aValue.mU.mPtr = nullptr;
  25   aValue.mType = SMILNullType::Singleton();
  26 }
  27
  28 nsresult SMILStringType::Assign(SMILValue& aDest, const SMILValue& aSrc) const {
  29   MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
  30   MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL value");
  31
  32   const nsAString* src = static_cast<const nsAString*>(aSrc.mU.mPtr);
  33   nsAString* dst = static_cast<nsAString*>(aDest.mU.mPtr);
  34   *dst = *src;
  35   return NS_OK;
  36 }
  37
  38 bool SMILStringType::IsEqual(const SMILValue& aLeft,
  39                              const SMILValue& aRight) const {
  40   MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
  41   MOZ_ASSERT(aLeft.mType == this, "Unexpected type for SMIL value");
  42
  43   const nsAString* leftString = static_cast<const nsAString*>(aLeft.mU.mPtr);
  44   const nsAString* rightString = static_cast<nsAString*>(aRight.mU.mPtr);
  45   return *leftString == *rightString;
  46 }
  47
  48 nsresult SMILStringType::Add(SMILValue& aDest, const SMILValue& aValueToAdd,
  49                              uint32_t aCount) const {
  50   MOZ_ASSERT(aValueToAdd.mType == aDest.mType, "Trying to add invalid types");
  51   MOZ_ASSERT(aValueToAdd.mType == this, "Unexpected source type");
  52   return NS_ERROR_FAILURE;  // string values can't be added to each other
  53 }
  54
  55 nsresult SMILStringType::ComputeDistance(const SMILValue& aFrom,
  56                                          const SMILValue& aTo,
  57                                          double& aDistance) const {
  58   MOZ_ASSERT(aFrom.mType == aTo.mType, "Trying to compare different types");
  59   MOZ_ASSERT(aFrom.mType == this, "Unexpected source type");
  60   return NS_ERROR_FAILURE;  // there is no concept of distance between string
  61                             // values
  62 }
  63
  64 nsresult SMILStringType::Interpolate(const SMILValue& aStartVal,
  65                                      const SMILValue& aEndVal,
  66                                      double aUnitDistance,
  67                                      SMILValue& aResult) const {
  68   MOZ_ASSERT(aStartVal.mType == aEndVal.mType,
  69              "Trying to interpolate different types");
  70   MOZ_ASSERT(aStartVal.mType == this, "Unexpected types for interpolation");
  71   MOZ_ASSERT(aResult.mType == this, "Unexpected result type");
  72   return NS_ERROR_FAILURE;  // string values do not interpolate
  73 }
  74
  75 }  // namespace mozilla