1 files changed, 94 insertions, 0 deletions
diff --git a/layout/style/AnimatedPropertyID.h b/layout/style/AnimatedPropertyID.h
new file mode 100644
index 0000000000..f532e72122
--- /dev/null
+++ b/layout/style/AnimatedPropertyID.h
@@ -0,0 +1,94 @@
+/* -*- 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/. */
+
+#ifndef mozilla_AnimatedPropertyID_h
+#define mozilla_AnimatedPropertyID_h
+
+#include "nsCSSPropertyID.h"
+#include "nsCSSProps.h"
+#include "nsString.h"
+#include "mozilla/HashFunctions.h"
+#include "mozilla/ServoBindings.h"
+
+namespace mozilla {
+
+struct AnimatedPropertyID {
+  explicit AnimatedPropertyID(nsCSSPropertyID aProperty) : mID(aProperty) {
+    MOZ_ASSERT(aProperty != eCSSPropertyExtra_variable,
+               "Cannot create an AnimatedPropertyID from only a "
+               "eCSSPropertyExtra_variable.");
+  }
+
+  explicit AnimatedPropertyID(RefPtr<nsAtom> aCustomName)
+      : mID(eCSSPropertyExtra_variable), mCustomName(std::move(aCustomName)) {
+    MOZ_ASSERT(mCustomName, "Null custom property name");
+  }
+
+  nsCSSPropertyID mID = eCSSProperty_UNKNOWN;
+  RefPtr<nsAtom> mCustomName;
+
+  bool IsCustom() const { return mID == eCSSPropertyExtra_variable; }
+  bool operator==(const AnimatedPropertyID& aOther) const {
+    return mID == aOther.mID && mCustomName == aOther.mCustomName;
+  }
+  bool operator!=(const AnimatedPropertyID& aOther) const {
+    return !(*this == aOther);
+  }
+
+  bool IsValid() const {
+    if (mID == eCSSProperty_UNKNOWN) {
+      return false;
+    }
+    return IsCustom() == !!mCustomName;
+  }
+
+  void ToString(nsACString& aString) const {
+    if (IsCustom()) {
+      MOZ_ASSERT(mCustomName, "Custom property should have a name");
+      // mCustomName does not include the "--" prefix
+      aString.AssignLiteral("--");
+      AppendUTF16toUTF8(nsDependentAtomString(mCustomName), aString);
+    } else {
+      aString.Assign(nsCSSProps::GetStringValue(mID));
+    }
+  }
+
+  void ToString(nsAString& aString) const {
+    if (IsCustom()) {
+      MOZ_ASSERT(mCustomName, "Custom property should have a name");
+      // mCustomName does not include the "--" prefix
+      aString.AssignLiteral("--");
+      aString.Append(nsDependentAtomString(mCustomName));
+    } else {
+      aString.Assign(NS_ConvertUTF8toUTF16(nsCSSProps::GetStringValue(mID)));
+    }
+  }
+
+  HashNumber Hash() const {
+    HashNumber hash = mCustomName ? mCustomName->hash() : 0;
+    return AddToHash(hash, mID);
+  }
+
+  AnimatedPropertyID ToPhysical(const ComputedStyle& aStyle) const {
+    if (IsCustom()) {
+      return *this;
+    }
+    return AnimatedPropertyID{nsCSSProps::Physicalize(mID, aStyle)};
+  }
+};
+
+// MOZ_DBG support for AnimatedPropertyId
+inline std::ostream& operator<<(std::ostream& aOut,
+                                const AnimatedPropertyID& aProperty) {
+  if (aProperty.IsCustom()) {
+    return aOut << nsAtomCString(aProperty.mCustomName);
+  }
+  return aOut << nsCSSProps::GetStringValue(aProperty.mID);
+}
+
+}  // namespace mozilla
+
+#endif  // mozilla_AnimatedPropertyID_h