/* -*- 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/. */ /* * nsINodeInfo is an interface to node info, such as name, prefix, namespace * ID and possibly other data that is shared between nodes (elements * and attributes) that have the same name, prefix and namespace ID within * the same document. * * nsNodeInfoManager's are internal objects that manage a list of * nsINodeInfo's, every document object should hold a strong reference to * a nsNodeInfoManager and every nsINodeInfo also holds a strong reference * to their owning manager. When a nsINodeInfo is no longer used it will * automatically remove itself from its owner manager, and when all * nsINodeInfo's have been removed from a nsNodeInfoManager and all external * references are released the nsNodeInfoManager deletes itself. * * -- jst@netscape.com */ #ifndef nsINodeInfo_h___ #define nsINodeInfo_h___ #include "nsCOMPtr.h" // for member #include "nsIAtom.h" // for member (in nsCOMPtr) #include "nsISupports.h" // for base class #include "nsNameSpaceManager.h" // for kNameSpaceID_* #ifdef MOZILLA_INTERNAL_API #include "nsDOMString.h" #endif class nsIDocument; class nsIURI; class nsIPrincipal; class nsNodeInfoManager; // IID for the nsINodeInfo interface #define NS_INODEINFO_IID \ { 0xc5188ea1, 0x0a9c, 0x43e6, \ { 0x95, 0x90, 0xcc, 0x43, 0x6b, 0xe9, 0xcf, 0xa0 } } class nsINodeInfo : public nsISupports { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODEINFO_IID) nsINodeInfo() : mInner(nullptr, nullptr, kNameSpaceID_None, 0, nullptr), mOwnerManager(nullptr) { } /* * Get the name from this node as a string, this does not include the prefix. * * For the HTML element "" this will return "body" and for the XML * element "" this will return "body". */ void GetName(nsAString& aName) const { mInner.mName->ToString(aName); } /* * Get the name from this node as an atom, this does not include the prefix. * This function never returns a null atom. * * For the HTML element "" this will return the "body" atom and for * the XML element "" this will return the "body" atom. */ nsIAtom* NameAtom() const { return mInner.mName; } /* * Get the qualified name from this node as a string, the qualified name * includes the prefix, if one exists. * * For the HTML element "" this will return "body" and for the XML * element "" this will return "html:body". */ const nsString& QualifiedName() const { return mQualifiedName; } /* * Returns the node's nodeName as defined in DOM Core */ const nsString& NodeName() const { return mNodeName; } /* * Returns the node's localName as defined in DOM Core */ const nsString& LocalName() const { return mLocalName; } #ifdef MOZILLA_INTERNAL_API /* * Get the prefix from this node as a string. * * For the HTML element "" this will return a null string and for * the XML element "" this will return the string "html". */ void GetPrefix(nsAString& aPrefix) const { if (mInner.mPrefix) { mInner.mPrefix->ToString(aPrefix); } else { SetDOMStringToNull(aPrefix); } } #endif /* * Get the prefix from this node as an atom. * * For the HTML element "" this will return a null atom and for * the XML element "" this will return the "html" atom. */ nsIAtom* GetPrefixAtom() const { return mInner.mPrefix; } /* * Get the namespace URI for a node, if the node has a namespace URI. */ virtual void GetNamespaceURI(nsAString& aNameSpaceURI) const = 0; /* * Get the namespace ID for a node if the node has a namespace, if not this * returns kNameSpaceID_None. */ int32_t NamespaceID() const { return mInner.mNamespaceID; } /* * Get the nodetype for the node. Returns the values specified in nsIDOMNode * for nsIDOMNode.nodeType */ uint16_t NodeType() const { return mInner.mNodeType; } /* * Get the extra name, used by PIs and DocTypes, for the node. */ nsIAtom* GetExtraName() const { return mInner.mExtraName; } /* * Get and set the ID attribute atom for this node. * See http://www.w3.org/TR/1998/REC-xml-19980210#sec-attribute-types * for the definition of an ID attribute. * */ nsIAtom* GetIDAttributeAtom() const { return mIDAttributeAtom; } void SetIDAttributeAtom(nsIAtom* aID) { mIDAttributeAtom = aID; } /** * Get the owning node info manager. Only to be used inside Gecko, you can't * really do anything with the pointer outside Gecko anyway. */ nsNodeInfoManager *NodeInfoManager() const { return mOwnerManager; } /* * Utility functions that can be used to check if a nodeinfo holds a specific * name, name and prefix, name and prefix and namespace ID, or just * namespace ID. */ bool Equals(nsINodeInfo *aNodeInfo) const { return aNodeInfo == this || aNodeInfo->Equals(mInner.mName, mInner.mPrefix, mInner.mNamespaceID); } bool NameAndNamespaceEquals(nsINodeInfo *aNodeInfo) const { return aNodeInfo == this || aNodeInfo->Equals(mInner.mName, mInner.mNamespaceID); } bool Equals(nsIAtom *aNameAtom) const { return mInner.mName == aNameAtom; } bool Equals(nsIAtom *aNameAtom, nsIAtom *aPrefixAtom) const { return (mInner.mName == aNameAtom) && (mInner.mPrefix == aPrefixAtom); } bool Equals(nsIAtom *aNameAtom, int32_t aNamespaceID) const { return ((mInner.mName == aNameAtom) && (mInner.mNamespaceID == aNamespaceID)); } bool Equals(nsIAtom *aNameAtom, nsIAtom *aPrefixAtom, int32_t aNamespaceID) const { return ((mInner.mName == aNameAtom) && (mInner.mPrefix == aPrefixAtom) && (mInner.mNamespaceID == aNamespaceID)); } bool NamespaceEquals(int32_t aNamespaceID) const { return mInner.mNamespaceID == aNamespaceID; } bool Equals(const nsAString& aName) const { return mInner.mName->Equals(aName); } bool Equals(const nsAString& aName, const nsAString& aPrefix) const { return mInner.mName->Equals(aName) && (mInner.mPrefix ? mInner.mPrefix->Equals(aPrefix) : aPrefix.IsEmpty()); } bool Equals(const nsAString& aName, int32_t aNamespaceID) const { return mInner.mNamespaceID == aNamespaceID && mInner.mName->Equals(aName); } bool Equals(const nsAString& aName, const nsAString& aPrefix, int32_t aNamespaceID) const { return mInner.mName->Equals(aName) && mInner.mNamespaceID == aNamespaceID && (mInner.mPrefix ? mInner.mPrefix->Equals(aPrefix) : aPrefix.IsEmpty()); } virtual bool NamespaceEquals(const nsAString& aNamespaceURI) const = 0; bool QualifiedNameEquals(nsIAtom* aNameAtom) const { NS_PRECONDITION(aNameAtom, "Must have name atom"); if (!GetPrefixAtom()) return Equals(aNameAtom); return aNameAtom->Equals(mQualifiedName); } bool QualifiedNameEquals(const nsAString& aQualifiedName) const { return mQualifiedName == aQualifiedName; } /* * Retrieve a pointer to the document that owns this node info. */ nsIDocument* GetDocument() const { return mDocument; } protected: /* * nsNodeInfoInner is used for two things: * * 1. as a member in nsNodeInfo for holding the name, prefix and * namespace ID * 2. as the hash key in the hash table in nsNodeInfoManager * * nsNodeInfoInner does not do any kind of reference counting, * that's up to the user of this class. Since nsNodeInfoInner is * typically used as a member of nsNodeInfo, the hash table doesn't * need to delete the keys. When the value (nsNodeInfo) is deleted * the key is automatically deleted. */ class nsNodeInfoInner { public: nsNodeInfoInner() : mName(nullptr), mPrefix(nullptr), mNamespaceID(kNameSpaceID_Unknown), mNodeType(0), mNameString(nullptr), mExtraName(nullptr) { } nsNodeInfoInner(nsIAtom *aName, nsIAtom *aPrefix, int32_t aNamespaceID, uint16_t aNodeType, nsIAtom* aExtraName) : mName(aName), mPrefix(aPrefix), mNamespaceID(aNamespaceID), mNodeType(aNodeType), mNameString(nullptr), mExtraName(aExtraName) { } nsNodeInfoInner(const nsAString& aTmpName, nsIAtom *aPrefix, int32_t aNamespaceID, uint16_t aNodeType) : mName(nullptr), mPrefix(aPrefix), mNamespaceID(aNamespaceID), mNodeType(aNodeType), mNameString(&aTmpName), mExtraName(nullptr) { } nsIAtom* mName; nsIAtom* mPrefix; int32_t mNamespaceID; uint16_t mNodeType; // As defined by nsIDOMNode.nodeType const nsAString* mNameString; nsIAtom* mExtraName; // Only used by PIs and DocTypes }; // nsNodeInfoManager needs to pass mInner to the hash table. friend class nsNodeInfoManager; nsIDocument* mDocument; // Weak. Cache of mOwnerManager->mDocument nsNodeInfoInner mInner; nsCOMPtr mIDAttributeAtom; nsNodeInfoManager* mOwnerManager; // Strong reference! /* * Members for various functions of mName+mPrefix that we can be * asked to compute. */ // Qualified name nsString mQualifiedName; // nodeName for the node. nsString mNodeName; // localName for the node. This is either equal to mInner.mName, or a // void string, depending on mInner.mNodeType. nsString mLocalName; }; NS_DEFINE_STATIC_IID_ACCESSOR(nsINodeInfo, NS_INODEINFO_IID) #endif /* nsINodeInfo_h___ */