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https://github.com/mozilla/gecko-dev.git
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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
219 lines
5.1 KiB
C++
219 lines
5.1 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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* Class that represents the name (nodeinfo or atom) of an attribute;
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* using nodeinfos all the time is too slow, so we use atoms when we
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* can.
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*/
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#ifndef nsAttrName_h___
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#define nsAttrName_h___
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#include "mozilla/dom/NodeInfo.h"
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#include "nsAtom.h"
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#include "nsDOMString.h"
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#define NS_ATTRNAME_NODEINFO_BIT 1
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class nsAttrName
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{
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public:
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nsAttrName(const nsAttrName& aOther)
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: mBits(aOther.mBits)
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{
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AddRefInternalName();
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}
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explicit nsAttrName(nsAtom* aAtom)
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: mBits(reinterpret_cast<uintptr_t>(aAtom))
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{
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NS_ASSERTION(aAtom, "null atom-name in nsAttrName");
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NS_ADDREF(aAtom);
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}
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explicit nsAttrName(mozilla::dom::NodeInfo* aNodeInfo)
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{
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NS_ASSERTION(aNodeInfo, "null nodeinfo-name in nsAttrName");
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if (aNodeInfo->NamespaceEquals(kNameSpaceID_None)) {
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mBits = reinterpret_cast<uintptr_t>(aNodeInfo->NameAtom());
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NS_ADDREF(aNodeInfo->NameAtom());
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}
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else {
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mBits = reinterpret_cast<uintptr_t>(aNodeInfo) |
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NS_ATTRNAME_NODEINFO_BIT;
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NS_ADDREF(aNodeInfo);
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}
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}
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~nsAttrName()
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{
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ReleaseInternalName();
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}
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void SetTo(mozilla::dom::NodeInfo* aNodeInfo)
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{
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NS_ASSERTION(aNodeInfo, "null nodeinfo-name in nsAttrName");
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ReleaseInternalName();
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if (aNodeInfo->NamespaceEquals(kNameSpaceID_None)) {
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mBits = reinterpret_cast<uintptr_t>(aNodeInfo->NameAtom());
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NS_ADDREF(aNodeInfo->NameAtom());
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}
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else {
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mBits = reinterpret_cast<uintptr_t>(aNodeInfo) |
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NS_ATTRNAME_NODEINFO_BIT;
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NS_ADDREF(aNodeInfo);
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}
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}
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void SetTo(nsAtom* aAtom)
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{
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NS_ASSERTION(aAtom, "null atom-name in nsAttrName");
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ReleaseInternalName();
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mBits = reinterpret_cast<uintptr_t>(aAtom);
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NS_ADDREF(aAtom);
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}
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bool IsAtom() const
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{
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return !(mBits & NS_ATTRNAME_NODEINFO_BIT);
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}
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mozilla::dom::NodeInfo* NodeInfo() const
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{
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NS_ASSERTION(!IsAtom(), "getting nodeinfo-value of atom-name");
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return reinterpret_cast<mozilla::dom::NodeInfo*>(mBits & ~NS_ATTRNAME_NODEINFO_BIT);
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}
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nsAtom* Atom() const
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{
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NS_ASSERTION(IsAtom(), "getting atom-value of nodeinfo-name");
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return reinterpret_cast<nsAtom*>(mBits);
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}
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bool Equals(const nsAttrName& aOther) const
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{
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return mBits == aOther.mBits;
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}
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// Faster comparison in the case we know the namespace is null
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// Note that some callers such as nsAttrAndChildArray::IndexOfAttr() will
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// call this function on nsAttrName structs with 0 mBits, so no attempt
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// must be made to do anything with mBits besides comparing it with the
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// incoming aAtom argument.
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bool Equals(nsAtom* aAtom) const
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{
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return reinterpret_cast<uintptr_t>(aAtom) == mBits;
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}
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// And the same but without forcing callers to atomize
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bool Equals(const nsAString& aLocalName) const
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{
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return IsAtom() && Atom()->Equals(aLocalName);
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}
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bool Equals(nsAtom* aLocalName, int32_t aNamespaceID) const
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{
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if (aNamespaceID == kNameSpaceID_None) {
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return Equals(aLocalName);
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}
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return !IsAtom() && NodeInfo()->Equals(aLocalName, aNamespaceID);
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}
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bool Equals(mozilla::dom::NodeInfo* aNodeInfo) const
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{
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return Equals(aNodeInfo->NameAtom(), aNodeInfo->NamespaceID());
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}
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int32_t NamespaceID() const
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{
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return IsAtom() ? kNameSpaceID_None : NodeInfo()->NamespaceID();
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}
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int32_t NamespaceEquals(int32_t aNamespaceID) const
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{
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return aNamespaceID == kNameSpaceID_None ?
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IsAtom() :
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(!IsAtom() && NodeInfo()->NamespaceEquals(aNamespaceID));
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}
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nsAtom* LocalName() const
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{
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return IsAtom() ? Atom() : NodeInfo()->NameAtom();
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}
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nsAtom* GetPrefix() const
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{
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return IsAtom() ? nullptr : NodeInfo()->GetPrefixAtom();
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}
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bool QualifiedNameEquals(const nsAString& aName) const
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{
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return IsAtom() ? Atom()->Equals(aName) :
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NodeInfo()->QualifiedNameEquals(aName);
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}
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void GetQualifiedName(nsAString& aStr) const
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{
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if (IsAtom()) {
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Atom()->ToString(aStr);
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}
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else {
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aStr = NodeInfo()->QualifiedName();
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}
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}
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#ifdef MOZILLA_INTERNAL_API
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void GetPrefix(nsAString& aStr) const
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{
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if (IsAtom()) {
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SetDOMStringToNull(aStr);
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}
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else {
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NodeInfo()->GetPrefix(aStr);
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}
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}
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#endif
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uint32_t HashValue() const
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{
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// mBits and uint32_t might have different size. This should silence
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// any warnings or compile-errors. This is what the implementation of
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// NS_PTR_TO_INT32 does to take care of the same problem.
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return mBits - 0;
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}
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bool IsSmaller(nsAtom* aOther) const
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{
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return mBits < reinterpret_cast<uintptr_t>(aOther);
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}
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private:
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void AddRefInternalName()
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{
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if (IsAtom()) {
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NS_ADDREF(Atom());
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} else {
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NS_ADDREF(NodeInfo());
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}
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}
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void ReleaseInternalName()
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{
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if (IsAtom()) {
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Atom()->Release();
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} else {
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NodeInfo()->Release();
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}
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}
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uintptr_t mBits;
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};
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#endif
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