forked from mirrors/gecko-dev
7bddcf9e5a
Instead, lazily schedule evaluation of them before styling, much like we were doing for SVG. A subtle tweak is that we only remain scheduled while in the document. This allows us to use the "in document" bit plus the "mapped attributes dirty" bit to know our scheduled status. It also prevents doing silly work for disconnected elements, and having to do hashmap lookups on adoption and node destruction. Differential Revision: https://phabricator.services.mozilla.com/D181549
233 lines
8 KiB
C++
233 lines
8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Storage of the attributes of a DOM node.
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*/
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#ifndef AttrArray_h___
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#define AttrArray_h___
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#include "mozilla/Attributes.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/Span.h"
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#include "mozilla/dom/BorrowedAttrInfo.h"
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#include "nscore.h"
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#include "nsAttrName.h"
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#include "nsAttrValue.h"
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#include "nsCaseTreatment.h"
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namespace mozilla {
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class AttributeStyles;
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struct StyleLockedDeclarationBlock;
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} // namespace mozilla
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class AttrArray {
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using BorrowedAttrInfo = mozilla::dom::BorrowedAttrInfo;
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public:
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AttrArray() = default;
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~AttrArray() = default;
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bool HasAttrs() const { return !!AttrCount(); }
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uint32_t AttrCount() const { return mImpl ? mImpl->mAttrCount : 0; }
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const nsAttrValue* GetAttr(const nsAtom* aLocalName,
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int32_t aNamespaceID = kNameSpaceID_None) const;
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// As above but using a string attr name and always using
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// kNameSpaceID_None. This is always case-sensitive.
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const nsAttrValue* GetAttr(const nsAString& aName) const;
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// Get an nsAttrValue by qualified name. Can optionally do
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// ASCII-case-insensitive name matching.
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const nsAttrValue* GetAttr(const nsAString& aName,
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nsCaseTreatment aCaseSensitive) const;
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const nsAttrValue* AttrAt(uint32_t aPos) const;
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// SetAndSwapAttr swaps the current attribute value with aValue.
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// If the attribute was unset, an empty value will be swapped into aValue
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// and aHadValue will be set to false. Otherwise, aHadValue will be set to
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// true.
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nsresult SetAndSwapAttr(nsAtom* aLocalName, nsAttrValue& aValue,
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bool* aHadValue);
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nsresult SetAndSwapAttr(mozilla::dom::NodeInfo* aName, nsAttrValue& aValue,
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bool* aHadValue);
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// This stores the argument and clears the pending mapped attribute evaluation
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// bit, so after calling this IsPendingMappedAttributeEvaluation() is
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// guaranteed to return false.
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void SetMappedDeclarationBlock(
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already_AddRefed<mozilla::StyleLockedDeclarationBlock>);
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bool IsPendingMappedAttributeEvaluation() const {
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return mImpl && mImpl->mMappedAttributeBits & 1;
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}
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mozilla::StyleLockedDeclarationBlock* GetMappedDeclarationBlock() const {
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return mImpl ? mImpl->GetMappedDeclarationBlock() : nullptr;
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}
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// Remove the attr at position aPos. The value of the attr is placed in
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// aValue; any value that was already in aValue is destroyed.
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nsresult RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue);
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// Returns attribute name at given position, *not* out-of-bounds safe
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const nsAttrName* AttrNameAt(uint32_t aPos) const;
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// Returns the attribute info at a given position, *not* out-of-bounds safe
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BorrowedAttrInfo AttrInfoAt(uint32_t aPos) const;
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// Returns attribute name at given position or null if aPos is out-of-bounds
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const nsAttrName* GetSafeAttrNameAt(uint32_t aPos) const;
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const nsAttrName* GetExistingAttrNameFromQName(const nsAString& aName) const;
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int32_t IndexOfAttr(const nsAtom* aLocalName,
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int32_t aNamespaceID = kNameSpaceID_None) const;
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void Compact();
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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// Mark the element as pending mapped attribute evaluation. This should be
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// called when a mapped attribute is changed (regardless of connectedness).
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bool MarkAsPendingPresAttributeEvaluation() {
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// It'd be great to be able to assert that mImpl is non-null or we're the
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// <body> element.
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if (MOZ_UNLIKELY(!mImpl) && !GrowBy(1)) {
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return false;
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}
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InfallibleMarkAsPendingPresAttributeEvaluation();
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return true;
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}
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// See above.
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void InfallibleMarkAsPendingPresAttributeEvaluation() {
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MOZ_ASSERT(mImpl);
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mImpl->mMappedAttributeBits |= 1;
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}
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// Clear the servo declaration block on the mapped attributes, if any
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// Will assert off main thread
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void ClearMappedServoStyle();
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// Increases capacity (if necessary) to have enough space to accomodate the
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// unmapped attributes of |aOther|.
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nsresult EnsureCapacityToClone(const AttrArray& aOther);
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enum AttrValuesState { ATTR_MISSING = -1, ATTR_VALUE_NO_MATCH = -2 };
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using AttrValuesArray = nsStaticAtom* const;
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int32_t FindAttrValueIn(int32_t aNameSpaceID, const nsAtom* aName,
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AttrValuesArray* aValues,
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nsCaseTreatment aCaseSensitive) const;
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inline bool GetAttr(int32_t aNameSpaceID, const nsAtom* aName,
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nsAString& aResult) const {
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MOZ_ASSERT(aResult.IsEmpty(), "Should have empty string coming in");
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const nsAttrValue* val = GetAttr(aName, aNameSpaceID);
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if (val) {
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val->ToString(aResult);
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return true;
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}
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return false;
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}
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inline bool HasAttr(int32_t aNameSpaceID, const nsAtom* aName) const {
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return GetAttr(aName, aNameSpaceID) != nullptr;
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}
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inline bool AttrValueIs(int32_t aNameSpaceID, const nsAtom* aName,
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const nsAString& aValue,
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nsCaseTreatment aCaseSensitive) const {
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NS_ASSERTION(aName, "Must have attr name");
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NS_ASSERTION(aNameSpaceID != kNameSpaceID_Unknown, "Must have namespace");
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const nsAttrValue* val = GetAttr(aName, aNameSpaceID);
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return val && val->Equals(aValue, aCaseSensitive);
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}
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inline bool AttrValueIs(int32_t aNameSpaceID, const nsAtom* aName,
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const nsAtom* aValue,
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nsCaseTreatment aCaseSensitive) const {
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NS_ASSERTION(aName, "Must have attr name");
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NS_ASSERTION(aNameSpaceID != kNameSpaceID_Unknown, "Must have namespace");
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NS_ASSERTION(aValue, "Null value atom");
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const nsAttrValue* val = GetAttr(aName, aNameSpaceID);
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return val && val->Equals(aValue, aCaseSensitive);
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}
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struct InternalAttr {
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nsAttrName mName;
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nsAttrValue mValue;
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};
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AttrArray(const AttrArray& aOther) = delete;
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AttrArray& operator=(const AttrArray& aOther) = delete;
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private:
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bool GrowBy(uint32_t aGrowSize);
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// Tries to create an attribute, growing the buffer if needed, with the given
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// name and value.
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//
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// The value is moved from the argument.
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//
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// `Name` can be anything you construct a `nsAttrName` with (either an atom or
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// a NodeInfo pointer).
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template <typename Name>
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nsresult AddNewAttribute(Name*, nsAttrValue&);
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class Impl {
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public:
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constexpr static size_t AllocationSizeForAttributes(uint32_t aAttrCount) {
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return sizeof(Impl) + aAttrCount * sizeof(InternalAttr);
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}
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mozilla::StyleLockedDeclarationBlock* GetMappedDeclarationBlock() const {
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return reinterpret_cast<mozilla::StyleLockedDeclarationBlock*>(
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mMappedAttributeBits & ~uintptr_t(1));
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}
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auto Attrs() const {
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return mozilla::Span<const InternalAttr>{mBuffer, mAttrCount};
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}
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auto Attrs() { return mozilla::Span<InternalAttr>{mBuffer, mAttrCount}; }
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Impl(const Impl&) = delete;
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Impl(Impl&&) = delete;
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~Impl();
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uint32_t mAttrCount;
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uint32_t mCapacity; // In number of InternalAttrs
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// mMappedAttributeBits is a tagged pointer of a
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// StyleLockedDeclarationBlock, which holds the style information that our
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// attributes map to.
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//
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// If the lower bit is set, then our mapped attributes are dirty. This just
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// means that we might have mapped attributes (or used to and no longer
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// have), and are pending an update to recompute our declaration.
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uintptr_t mMappedAttributeBits = 0;
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// Allocated in the same buffer as `Impl`.
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InternalAttr mBuffer[0];
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};
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mozilla::Span<InternalAttr> Attrs() {
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return mImpl ? mImpl->Attrs() : mozilla::Span<InternalAttr>();
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}
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mozilla::Span<const InternalAttr> Attrs() const {
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return mImpl ? mImpl->Attrs() : mozilla::Span<const InternalAttr>();
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}
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mozilla::UniquePtr<Impl> mImpl;
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};
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#endif
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