1 files changed, 142 insertions, 0 deletions
diff --git a/dom/smil/SMILValue.cpp b/dom/smil/SMILValue.cpp
new file mode 100644
index 0000000000..4942e3b8b6
--- /dev/null
+++ b/dom/smil/SMILValue.cpp
@@ -0,0 +1,142 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "SMILValue.h"
+
+#include "nsDebug.h"
+#include <string.h>
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// Public methods
+
+SMILValue::SMILValue(const SMILType* aType) : mType(SMILNullType::Singleton()) {
+  mU.mBool = false;
+  if (!aType) {
+    NS_ERROR("Trying to construct SMILValue with null mType pointer");
+    return;
+  }
+
+  InitAndCheckPostcondition(aType);
+}
+
+SMILValue::SMILValue(const SMILValue& aVal) : mType(SMILNullType::Singleton()) {
+  InitAndCheckPostcondition(aVal.mType);
+  mType->Assign(*this, aVal);
+}
+
+const SMILValue& SMILValue::operator=(const SMILValue& aVal) {
+  if (&aVal == this) return *this;
+
+  if (mType != aVal.mType) {
+    DestroyAndReinit(aVal.mType);
+  }
+
+  mType->Assign(*this, aVal);
+
+  return *this;
+}
+
+// Move constructor / reassignment operator:
+SMILValue::SMILValue(SMILValue&& aVal) noexcept
+    : mU(aVal.mU),  // Copying union is only OK because we clear aVal.mType
+                    // below.
+      mType(aVal.mType) {
+  // Leave aVal with a null type, so that it's safely destructible (and won't
+  // mess with anything referenced by its union, which we've copied).
+  aVal.mType = SMILNullType::Singleton();
+}
+
+SMILValue& SMILValue::operator=(SMILValue&& aVal) noexcept {
+  if (!IsNull()) {
+    // Clean up any data we're currently tracking.
+    DestroyAndCheckPostcondition();
+  }
+
+  // Copy the union (which could include a pointer to external memory) & mType:
+  mU = aVal.mU;
+  mType = aVal.mType;
+
+  // Leave aVal with a null type, so that it's safely destructible (and won't
+  // mess with anything referenced by its union, which we've now copied).
+  aVal.mType = SMILNullType::Singleton();
+
+  return *this;
+}
+
+bool SMILValue::operator==(const SMILValue& aVal) const {
+  if (&aVal == this) return true;
+
+  return mType == aVal.mType && mType->IsEqual(*this, aVal);
+}
+
+nsresult SMILValue::Add(const SMILValue& aValueToAdd, uint32_t aCount) {
+  if (aValueToAdd.mType != mType) {
+    NS_ERROR("Trying to add incompatible types");
+    return NS_ERROR_FAILURE;
+  }
+
+  return mType->Add(*this, aValueToAdd, aCount);
+}
+
+nsresult SMILValue::SandwichAdd(const SMILValue& aValueToAdd) {
+  if (aValueToAdd.mType != mType) {
+    NS_ERROR("Trying to add incompatible types");
+    return NS_ERROR_FAILURE;
+  }
+
+  return mType->SandwichAdd(*this, aValueToAdd);
+}
+
+nsresult SMILValue::ComputeDistance(const SMILValue& aTo,
+                                    double& aDistance) const {
+  if (aTo.mType != mType) {
+    NS_ERROR("Trying to calculate distance between incompatible types");
+    return NS_ERROR_FAILURE;
+  }
+
+  return mType->ComputeDistance(*this, aTo, aDistance);
+}
+
+nsresult SMILValue::Interpolate(const SMILValue& aEndVal, double aUnitDistance,
+                                SMILValue& aResult) const {
+  if (aEndVal.mType != mType) {
+    NS_ERROR("Trying to interpolate between incompatible types");
+    return NS_ERROR_FAILURE;
+  }
+
+  if (aResult.mType != mType) {
+    // Outparam has wrong type
+    aResult.DestroyAndReinit(mType);
+  }
+
+  return mType->Interpolate(*this, aEndVal, aUnitDistance, aResult);
+}
+
+//----------------------------------------------------------------------
+// Helper methods
+
+// Wrappers for SMILType::Init & ::Destroy that verify their postconditions
+void SMILValue::InitAndCheckPostcondition(const SMILType* aNewType) {
+  aNewType->Init(*this);
+  MOZ_ASSERT(mType == aNewType,
+             "Post-condition of Init failed. SMILValue is invalid");
+}
+
+void SMILValue::DestroyAndCheckPostcondition() {
+  mType->Destroy(*this);
+  MOZ_ASSERT(IsNull(),
+             "Post-condition of Destroy failed. "
+             "SMILValue not null after destroying");
+}
+
+void SMILValue::DestroyAndReinit(const SMILType* aNewType) {
+  DestroyAndCheckPostcondition();
+  InitAndCheckPostcondition(aNewType);
+}
+
+}  // namespace mozilla