/* -*- 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_ServoElementSnapshot_h #define mozilla_ServoElementSnapshot_h #include "mozilla/EventStates.h" #include "mozilla/TypedEnumBits.h" #include "mozilla/dom/BorrowedAttrInfo.h" #include "nsAttrName.h" #include "nsAttrValue.h" #include "nsChangeHint.h" #include "nsIAtom.h" namespace mozilla { namespace dom { class Element; } // namespace dom /** * A structure representing a single attribute name and value. * * This is pretty similar to the private nsAttrAndChildArray::InternalAttr. */ struct ServoAttrSnapshot { nsAttrName mName; nsAttrValue mValue; ServoAttrSnapshot(const nsAttrName& aName, const nsAttrValue& aValue) : mName(aName) , mValue(aValue) { } }; /** * A bitflags enum class used to determine what data does a ServoElementSnapshot * contains. */ enum class ServoElementSnapshotFlags : uint8_t { State = 1 << 0, Attributes = 1 << 1, All = State | Attributes }; MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ServoElementSnapshotFlags) /** * This class holds all non-tree-structural state of an element that might be * used for selector matching eventually. * * This means the attributes, and the element state, such as :hover, :active, * etc... */ class ServoElementSnapshot { typedef dom::BorrowedAttrInfo BorrowedAttrInfo; typedef dom::Element Element; typedef EventStates::ServoType ServoStateType; public: typedef ServoElementSnapshotFlags Flags; explicit ServoElementSnapshot(Element* aElement); bool HasAttrs() { return HasAny(Flags::Attributes); } bool HasState() { return HasAny(Flags::State); } /** * Captures the given state (if not previously captured). */ void AddState(EventStates aState) { if (!HasAny(Flags::State)) { mState = aState.ServoValue(); mContains |= Flags::State; } } /** * Captures the given element attributes (if not previously captured). */ void AddAttrs(Element* aElement); void AddExplicitChangeHint(nsChangeHint aMinChangeHint) { mExplicitChangeHint |= aMinChangeHint; } void AddExplicitRestyleHint(nsRestyleHint aRestyleHint) { mExplicitRestyleHint |= aRestyleHint; } nsRestyleHint ExplicitRestyleHint() { return mExplicitRestyleHint; } nsChangeHint ExplicitChangeHint() { return mExplicitChangeHint; } /** * Needed methods for attribute matching. */ BorrowedAttrInfo GetAttrInfoAt(uint32_t aIndex) const { if (aIndex >= mAttrs.Length()) { return BorrowedAttrInfo(nullptr, nullptr); } return BorrowedAttrInfo(&mAttrs[aIndex].mName, &mAttrs[aIndex].mValue); } const nsAttrValue* GetParsedAttr(nsIAtom* aLocalName) const { return GetParsedAttr(aLocalName, kNameSpaceID_None); } const nsAttrValue* GetParsedAttr(nsIAtom* aLocalName, int32_t aNamespaceID) const { uint32_t i, len = mAttrs.Length(); if (aNamespaceID == kNameSpaceID_None) { // This should be the common case so lets make an optimized loop for (i = 0; i < len; ++i) { if (mAttrs[i].mName.Equals(aLocalName)) { return &mAttrs[i].mValue; } } return nullptr; } for (i = 0; i < len; ++i) { if (mAttrs[i].mName.Equals(aLocalName, aNamespaceID)) { return &mAttrs[i].mValue; } } return nullptr; } bool IsInChromeDocument() const { return mIsInChromeDocument; } bool HasAny(Flags aFlags) { return bool(mContains & aFlags); } private: // TODO: Profile, a 1 or 2 element AutoTArray could be worth it, given we know // we're dealing with attribute changes when we take snapshots of attributes, // though it can be wasted space if we deal with a lot of state-only // snapshots. Flags mContains; nsTArray<ServoAttrSnapshot> mAttrs; ServoStateType mState; nsRestyleHint mExplicitRestyleHint; nsChangeHint mExplicitChangeHint; bool mIsHTMLElementInHTMLDocument; bool mIsInChromeDocument; }; } // namespace mozilla #endif