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d225f7151b
(Path is actually r=froydnj.) Bug 1400459 devirtualized nsIAtom so that it is no longer a subclass of nsISupports. This means that nsAtom is now a better name for it than nsIAtom. MozReview-Commit-ID: 91U22X2NydP --HG-- rename : xpcom/ds/nsIAtom.h => xpcom/ds/nsAtom.h extra : rebase_source : ac3e904a21b8b48e74534fff964f1623ee937c67
249 lines
8.3 KiB
C++
249 lines
8.3 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 children and attributes of a DOM node; storage for
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* the two is unified to minimize footprint.
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*/
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#ifndef nsAttrAndChildArray_h___
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#define nsAttrAndChildArray_h___
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#include "mozilla/Attributes.h"
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#include "mozilla/MemoryReporting.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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class nsINode;
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class nsIContent;
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class nsMappedAttributes;
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class nsHTMLStyleSheet;
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class nsRuleWalker;
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class nsMappedAttributeElement;
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#define ATTRCHILD_ARRAY_GROWSIZE 8
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#define ATTRCHILD_ARRAY_LINEAR_THRESHOLD 32
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#define ATTRCHILD_ARRAY_ATTR_SLOTS_BITS 10
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#define ATTRCHILD_ARRAY_MAX_ATTR_COUNT \
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((1 << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) - 1)
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#define ATTRCHILD_ARRAY_MAX_CHILD_COUNT \
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(~uint32_t(0) >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS)
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#define ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK \
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((1 << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) - 1)
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#define ATTRSIZE (sizeof(InternalAttr) / sizeof(void*))
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class nsAttrAndChildArray
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{
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typedef mozilla::dom::BorrowedAttrInfo BorrowedAttrInfo;
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public:
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nsAttrAndChildArray();
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~nsAttrAndChildArray();
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uint32_t ChildCount() const
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{
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return mImpl ? (mImpl->mAttrAndChildCount >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) : 0;
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}
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nsIContent* ChildAt(uint32_t aPos) const
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{
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NS_ASSERTION(aPos < ChildCount(), "out-of-bounds access in nsAttrAndChildArray");
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return reinterpret_cast<nsIContent*>(mImpl->mBuffer[AttrSlotsSize() + aPos]);
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}
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nsIContent* GetSafeChildAt(uint32_t aPos) const;
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nsIContent * const * GetChildArray(uint32_t* aChildCount) const;
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nsresult AppendChild(nsIContent* aChild)
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{
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return InsertChildAt(aChild, ChildCount());
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}
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nsresult InsertChildAt(nsIContent* aChild, uint32_t aPos);
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void RemoveChildAt(uint32_t aPos);
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// Like RemoveChildAt but hands the reference to the child being
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// removed back to the caller instead of just releasing it.
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already_AddRefed<nsIContent> TakeChildAt(uint32_t aPos);
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int32_t IndexOfChild(const nsINode* aPossibleChild) const;
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bool HasAttrs() const
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{
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return MappedAttrCount() || (AttrSlotCount() && AttrSlotIsTaken(0));
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}
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uint32_t AttrCount() const;
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const nsAttrValue* GetAttr(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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// 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(nsAtom* aLocalName, int32_t aNamespaceID = kNameSpaceID_None) const;
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// SetAndSwapMappedAttr 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 SetAndSwapMappedAttr(nsAtom* aLocalName, nsAttrValue& aValue,
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nsMappedAttributeElement* aContent,
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nsHTMLStyleSheet* aSheet,
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bool* aHadValue);
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nsresult SetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet) {
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if (!mImpl || !mImpl->mMappedAttrs) {
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return NS_OK;
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}
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return DoSetMappedAttrStyleSheet(aSheet);
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}
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void WalkMappedAttributeStyleRules(nsRuleWalker* aRuleWalker);
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void Compact();
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bool CanFitMoreAttrs() const
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{
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return AttrSlotCount() < ATTRCHILD_ARRAY_MAX_ATTR_COUNT ||
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!AttrSlotIsTaken(ATTRCHILD_ARRAY_MAX_ATTR_COUNT - 1);
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}
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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bool HasMappedAttrs() const
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{
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return MappedAttrCount();
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}
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const nsMappedAttributes* GetMapped() const;
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// Force this to have mapped attributes, even if those attributes are empty.
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nsresult ForceMapped(nsMappedAttributeElement* aContent, nsIDocument* aDocument);
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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 and children of |aOther|. If |aAllocateChildren| is not
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// true, only enough space for unmapped attributes will be reserved.
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// It is REQUIRED that this function be called ONLY when the array is empty.
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nsresult EnsureCapacityToClone(const nsAttrAndChildArray& aOther,
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bool aAllocateChildren);
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private:
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nsAttrAndChildArray(const nsAttrAndChildArray& aOther) = delete;
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nsAttrAndChildArray& operator=(const nsAttrAndChildArray& aOther) = delete;
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void Clear();
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uint32_t NonMappedAttrCount() const;
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uint32_t MappedAttrCount() const;
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// Returns a non-null zero-refcount object.
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nsMappedAttributes*
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GetModifiableMapped(nsMappedAttributeElement* aContent,
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nsHTMLStyleSheet* aSheet,
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bool aWillAddAttr,
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int32_t aAttrCount = 1);
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nsresult MakeMappedUnique(nsMappedAttributes* aAttributes);
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uint32_t AttrSlotsSize() const
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{
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return AttrSlotCount() * ATTRSIZE;
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}
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uint32_t AttrSlotCount() const
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{
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return mImpl ? mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK : 0;
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}
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bool AttrSlotIsTaken(uint32_t aSlot) const
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{
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NS_PRECONDITION(aSlot < AttrSlotCount(), "out-of-bounds");
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return mImpl->mBuffer[aSlot * ATTRSIZE];
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}
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void SetChildCount(uint32_t aCount)
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{
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mImpl->mAttrAndChildCount =
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(mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) |
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(aCount << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS);
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}
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void SetAttrSlotCount(uint32_t aCount)
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{
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mImpl->mAttrAndChildCount =
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(mImpl->mAttrAndChildCount & ~ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) |
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aCount;
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}
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void SetAttrSlotAndChildCount(uint32_t aSlotCount, uint32_t aChildCount)
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{
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mImpl->mAttrAndChildCount = aSlotCount |
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(aChildCount << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS);
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}
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bool GrowBy(uint32_t aGrowSize);
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bool AddAttrSlot();
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/**
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* Set *aPos to aChild and update sibling pointers as needed. aIndex is the
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* index at which aChild is actually being inserted. aChildCount is the
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* number of kids we had before the insertion.
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*/
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inline void SetChildAtPos(void** aPos, nsIContent* aChild, uint32_t aIndex,
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uint32_t aChildCount);
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/**
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* Guts of SetMappedAttrStyleSheet for the rare case when we have mapped attrs
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*/
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nsresult DoSetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet);
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struct InternalAttr
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{
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nsAttrName mName;
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nsAttrValue mValue;
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};
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struct Impl {
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uint32_t mAttrAndChildCount;
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uint32_t mBufferSize;
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nsMappedAttributes* mMappedAttrs;
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void* mBuffer[1];
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};
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Impl* mImpl;
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};
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#endif
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