/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla.org code. * * The Initial Developer of the Original Code is Mozilla.com. * Portions created by the Initial Developer are Copyright (C) 2006 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Boris Zbarsky (Original Author) * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifndef nsINode_h___ #define nsINode_h___ #include "nsPIDOMEventTarget.h" #include "nsEvent.h" #include "nsPropertyTable.h" #include "nsTObserverArray.h" #include "nsINodeInfo.h" #include "nsCOMPtr.h" #include "nsWrapperCache.h" #include "nsIProgrammingLanguage.h" // for ::JAVASCRIPT class nsIContent; class nsIDocument; class nsIDOMEvent; class nsIDOMNode; class nsIDOMNodeList; class nsINodeList; class nsIPresShell; class nsPresContext; class nsEventChainVisitor; class nsEventChainPreVisitor; class nsEventChainPostVisitor; class nsIEventListenerManager; class nsIPrincipal; class nsIMutationObserver; class nsChildContentList; class nsNodeWeakReference; class nsNodeSupportsWeakRefTearoff; class nsIEditor; enum { // This bit will be set if the node doesn't have nsSlots NODE_DOESNT_HAVE_SLOTS = 0x00000001U, // This bit will be set if the node has a listener manager in the listener // manager hash NODE_HAS_LISTENERMANAGER = 0x00000002U, // Whether this node has had any properties set on it NODE_HAS_PROPERTIES = 0x00000004U, // Whether this node is the root of an anonymous subtree. Note that this // need not be a native anonymous subtree. Any anonymous subtree, including // XBL-generated ones, will do. This flag is set-once: once a node has it, // it must not be removed. // NOTE: Should only be used on nsIContent nodes NODE_IS_ANONYMOUS = 0x00000008U, // Whether the node has some ancestor, possibly itself, that is native // anonymous. This includes ancestors crossing XBL scopes, in cases when an // XBL binding is attached to an element which has a native anonymous // ancestor. This flag is set-once: once a node has it, it must not be // removed. // NOTE: Should only be used on nsIContent nodes NODE_IS_IN_ANONYMOUS_SUBTREE = 0x00000010U, // Whether this node is the root of a native anonymous (from the perspective // of its parent) subtree. This flag is set-once: once a node has it, it // must not be removed. // NOTE: Should only be used on nsIContent nodes NODE_IS_NATIVE_ANONYMOUS_ROOT = 0x00000020U, // Whether this node may have a frame // NOTE: Should only be used on nsIContent nodes NODE_MAY_HAVE_FRAME = 0x00000040U, // Forces the XBL code to treat this node as if it were // in the document and therefore should get bindings attached. NODE_FORCE_XBL_BINDINGS = 0x00000080U, // Whether a binding manager may have a pointer to this NODE_MAY_BE_IN_BINDING_MNGR = 0x00000100U, NODE_IS_EDITABLE = 0x00000200U, // Optimizations to quickly check whether element may have ID, class or style // attributes. Not all element implementations may use these! NODE_MAY_HAVE_ID = 0x00000400U, // For all Element nodes, NODE_MAY_HAVE_CLASS is guaranteed to be set if the // node in fact has a class, but may be set even if it doesn't. NODE_MAY_HAVE_CLASS = 0x00000800U, NODE_MAY_HAVE_STYLE = 0x00001000U, NODE_IS_INSERTION_PARENT = 0x00002000U, // Node has an :empty or :-moz-only-whitespace selector NODE_HAS_EMPTY_SELECTOR = 0x00004000U, // A child of the node has a selector such that any insertion, // removal, or appending of children requires restyling the parent. NODE_HAS_SLOW_SELECTOR = 0x00008000U, // A child of the node has a :first-child, :-moz-first-node, // :only-child, :last-child or :-moz-last-node selector. NODE_HAS_EDGE_CHILD_SELECTOR = 0x00010000U, // A child of the node has a selector such that any insertion or // removal of children requires restyling the parent (but append is // OK). NODE_HAS_SLOW_SELECTOR_NOAPPEND = 0x00020000U, NODE_ALL_SELECTOR_FLAGS = NODE_HAS_EMPTY_SELECTOR | NODE_HAS_SLOW_SELECTOR | NODE_HAS_EDGE_CHILD_SELECTOR | NODE_HAS_SLOW_SELECTOR_NOAPPEND, // Four bits for the script-type ID NODE_SCRIPT_TYPE_OFFSET = 18, NODE_SCRIPT_TYPE_SIZE = 4, // Remaining bits are node type specific. NODE_TYPE_SPECIFIC_BITS_OFFSET = NODE_SCRIPT_TYPE_OFFSET + NODE_SCRIPT_TYPE_SIZE }; // Useful inline function for getting a node given an nsIContent and an // nsIDocument. Returns the first argument cast to nsINode if it is non-null, // otherwise returns the second (which may be null). We use type variables // instead of nsIContent* and nsIDocument* because the actual types must be // known for the cast to work. template inline nsINode* NODE_FROM(C& aContent, D& aDocument) { if (aContent) return static_cast(aContent); return static_cast(aDocument); } /** * Class used to detect unexpected mutations. To use the class create an * nsMutationGuard on the stack before unexpected mutations could occur. * You can then at any time call Mutated to check if any unexpected mutations * have occured. * * When a guard is instantiated sMutationCount is set to 300. It is then * decremented by every mutation (capped at 0). This means that we can only * detect 300 mutations during the lifetime of a single guard, however that * should be more then we ever care about as we usually only care if more then * one mutation has occured. * * When the guard goes out of scope it will adjust sMutationCount so that over * the lifetime of the guard the guard itself has not affected sMutationCount, * while mutations that happened while the guard was alive still will. This * allows a guard to be instantiated even if there is another guard higher up * on the callstack watching for mutations. * * The only thing that has to be avoided is for an outer guard to be used * while an inner guard is alive. This can be avoided by only ever * instantiating a single guard per scope and only using the guard in the * current scope. */ class nsMutationGuard { public: nsMutationGuard() { mDelta = eMaxMutations - sMutationCount; sMutationCount = eMaxMutations; } ~nsMutationGuard() { sMutationCount = mDelta > sMutationCount ? 0 : sMutationCount - mDelta; } /** * Returns true if any unexpected mutations have occured. You can pass in * an 8-bit ignore count to ignore a number of expected mutations. */ PRBool Mutated(PRUint8 aIgnoreCount) { return sMutationCount < static_cast(eMaxMutations - aIgnoreCount); } // This function should be called whenever a mutation that we want to keep // track of happen. For now this is only done when children are added or // removed, but we might do it for attribute changes too in the future. static void DidMutate() { if (sMutationCount) { --sMutationCount; } } private: // mDelta is the amount sMutationCount was adjusted when the guard was // initialized. It is needed so that we can undo that adjustment once // the guard dies. PRUint32 mDelta; // The value 300 is not important, as long as it is bigger then anything // ever passed to Mutated(). enum { eMaxMutations = 300 }; // sMutationCount is a global mutation counter which is decreased by one at // every mutation. It is capped at 0 to avoid wrapping. // Its value is always between 0 and 300, inclusive. static PRUint32 sMutationCount; }; // IID for the nsINode interface #define NS_INODE_IID \ { 0xfc22c6df, 0x3e8e, 0x47c3, \ { 0x96, 0xa6, 0xaf, 0x14, 0x3c, 0x05, 0x88, 0x68 } } /** * An internal interface that abstracts some DOMNode-related parts that both * nsIContent and nsIDocument share. An instance of this interface has a list * of nsIContent children and provides access to them. */ class nsINode : public nsPIDOMEventTarget, public nsWrapperCache { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODE_IID) friend class nsNodeUtils; friend class nsNodeWeakReference; friend class nsNodeSupportsWeakRefTearoff; #ifdef MOZILLA_INTERNAL_API nsINode(nsINodeInfo* aNodeInfo) : mNodeInfo(aNodeInfo), mParentPtrBits(0), mFlagsOrSlots(NODE_DOESNT_HAVE_SLOTS) { } #endif virtual ~nsINode(); /** * Bit-flags to pass (or'ed together) to IsNodeOfType() */ enum { /** nsIContent nodes */ eCONTENT = 1 << 0, /** nsIDocument nodes */ eDOCUMENT = 1 << 1, /** nsIAttribute nodes */ eATTRIBUTE = 1 << 2, /** elements */ eELEMENT = 1 << 3, /** text nodes */ eTEXT = 1 << 4, /** xml processing instructions */ ePROCESSING_INSTRUCTION = 1 << 5, /** comment nodes */ eCOMMENT = 1 << 6, /** html elements */ eHTML = 1 << 7, /** form control elements */ eHTML_FORM_CONTROL = 1 << 8, /** XUL elements */ eXUL = 1 << 9, /** svg elements */ eSVG = 1 << 10, /** document fragments */ eDOCUMENT_FRAGMENT = 1 << 11, /** data nodes (comments, PIs, text). Nodes of this type always returns a non-null value for nsIContent::GetText() */ eDATA_NODE = 1 << 12, /** nsMathMLElement */ eMATHML = 1 << 13, /** nsHTMLMediaElement */ eMEDIA = 1 << 14 }; /** * API for doing a quick check if a content is of a given * type, such as HTML, XUL, Text, ... Use this when you can instead of * checking the tag. * * @param aFlags what types you want to test for (see above) * @return whether the content matches ALL flags passed in */ virtual PRBool IsNodeOfType(PRUint32 aFlags) const = 0; /** * Get the number of children * @return the number of children */ virtual PRUint32 GetChildCount() const = 0; /** * Get a child by index * @param aIndex the index of the child to get * @return the child, or null if index out of bounds */ virtual nsIContent* GetChildAt(PRUint32 aIndex) const = 0; /** * Get a raw pointer to the child array. This should only be used if you * plan to walk a bunch of the kids, promise to make sure that nothing ever * mutates (no attribute changes, not DOM tree changes, no script execution, * NOTHING), and will never ever peform an out-of-bounds access here. This * method may return null if there are no children, or it may return a * garbage pointer. In all cases the out param will be set to the number of * children. */ virtual nsIContent * const * GetChildArray(PRUint32* aChildCount) const = 0; /** * Get the index of a child within this content * @param aPossibleChild the child to get the index of. * @return the index of the child, or -1 if not a child * * If the return value is not -1, then calling GetChildAt() with that value * will return aPossibleChild. */ virtual PRInt32 IndexOf(nsINode* aPossibleChild) const = 0; /** * Return the "owner document" of this node. Note that this is not the same * as the DOM ownerDocument -- that's null for Document nodes, whereas for a * nsIDocument GetOwnerDocument returns the document itself. For nsIContent * implementations the two are the same. */ nsIDocument *GetOwnerDoc() const { return mNodeInfo->GetDocument(); } /** * Returns true if the content has an ancestor that is a document. * * @return whether this content is in a document tree */ PRBool IsInDoc() const { return mParentPtrBits & PARENT_BIT_INDOCUMENT; } /** * Get the document that this content is currently in, if any. This will be * null if the content has no ancestor that is a document. * * @return the current document */ nsIDocument *GetCurrentDoc() const { return IsInDoc() ? GetOwnerDoc() : nsnull; } /** * Insert a content node at a particular index. This method handles calling * BindToTree on the child appropriately. * * @param aKid the content to insert * @param aIndex the index it is being inserted at (the index it will have * after it is inserted) * @param aNotify whether to notify the document (current document for * nsIContent, and |this| for nsIDocument) that the insert has * occurred * * @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more * than one element node as a child of a document. Doing this will also * assert -- you shouldn't be doing it! Check with * nsIDocument::GetRootContent() first if you're not sure. Apart from this * one constraint, this doesn't do any checking on whether aKid is a valid * child of |this|. * * @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree). */ virtual nsresult InsertChildAt(nsIContent* aKid, PRUint32 aIndex, PRBool aNotify) = 0; /** * Append a content node to the end of the child list. This method handles * calling BindToTree on the child appropriately. * * @param aKid the content to append * @param aNotify whether to notify the document (current document for * nsIContent, and |this| for nsIDocument) that the append has * occurred * * @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more * than one element node as a child of a document. Doing this will also * assert -- you shouldn't be doing it! Check with * nsIDocument::GetRootContent() first if you're not sure. Apart from this * one constraint, this doesn't do any checking on whether aKid is a valid * child of |this|. * * @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree). */ nsresult AppendChildTo(nsIContent* aKid, PRBool aNotify) { return InsertChildAt(aKid, GetChildCount(), aNotify); } /** * Remove a child from this node. This method handles calling UnbindFromTree * on the child appropriately. * * @param aIndex the index of the child to remove * @param aNotify whether to notify the document (current document for * nsIContent, and |this| for nsIDocument) that the remove has * occurred * * Note: If there is no child at aIndex, this method will simply do nothing. */ virtual nsresult RemoveChildAt(PRUint32 aIndex, PRBool aNotify) = 0; /** * Get a property associated with this node. * * @param aPropertyName name of property to get. * @param aStatus out parameter for storing resulting status. * Set to NS_PROPTABLE_PROP_NOT_THERE if the property * is not set. * @return the property. Null if the property is not set * (though a null return value does not imply the * property was not set, i.e. it can be set to null). */ void* GetProperty(nsIAtom *aPropertyName, nsresult *aStatus = nsnull) const { return GetProperty(0, aPropertyName, aStatus); } /** * Get a property associated with this node. * * @param aCategory category of property to get. * @param aPropertyName name of property to get. * @param aStatus out parameter for storing resulting status. * Set to NS_PROPTABLE_PROP_NOT_THERE if the property * is not set. * @return the property. Null if the property is not set * (though a null return value does not imply the * property was not set, i.e. it can be set to null). */ virtual void* GetProperty(PRUint16 aCategory, nsIAtom *aPropertyName, nsresult *aStatus = nsnull) const; /** * Set a property to be associated with this node. This will overwrite an * existing value if one exists. The existing value is destroyed using the * destructor function given when that value was set. * * @param aPropertyName name of property to set. * @param aValue new value of property. * @param aDtor destructor function to be used when this property * is destroyed. * @param aTransfer if PR_TRUE the property will not be deleted when the * ownerDocument of the node changes, if PR_FALSE it * will be deleted. * * @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property * was already set * @throws NS_ERROR_OUT_OF_MEMORY if that occurs */ nsresult SetProperty(nsIAtom *aPropertyName, void *aValue, NSPropertyDtorFunc aDtor = nsnull, PRBool aTransfer = PR_FALSE) { return SetProperty(0, aPropertyName, aValue, aDtor, aTransfer); } /** * Set a property to be associated with this node. This will overwrite an * existing value if one exists. The existing value is destroyed using the * destructor function given when that value was set. * * @param aCategory category of property to set. * @param aPropertyName name of property to set. * @param aValue new value of property. * @param aDtor destructor function to be used when this property * is destroyed. * @param aTransfer if PR_TRUE the property will not be deleted when the * ownerDocument of the node changes, if PR_FALSE it * will be deleted. * @param aOldValue [out] previous value of property. * * @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property * was already set * @throws NS_ERROR_OUT_OF_MEMORY if that occurs */ virtual nsresult SetProperty(PRUint16 aCategory, nsIAtom *aPropertyName, void *aValue, NSPropertyDtorFunc aDtor = nsnull, PRBool aTransfer = PR_FALSE, void **aOldValue = nsnull); /** * Destroys a property associated with this node. The value is destroyed * using the destruction function given when that value was set. * * @param aPropertyName name of property to destroy. * * @throws NS_PROPTABLE_PROP_NOT_THERE if the property was not set */ nsresult DeleteProperty(nsIAtom *aPropertyName) { return DeleteProperty(0, aPropertyName); } /** * Destroys a property associated with this node. The value is destroyed * using the destruction function given when that value was set. * * @param aCategory category of property to destroy. * @param aPropertyName name of property to destroy. * * @throws NS_PROPTABLE_PROP_NOT_THERE if the property was not set */ virtual nsresult DeleteProperty(PRUint16 aCategory, nsIAtom *aPropertyName); /** * Unset a property associated with this node. The value will not be * destroyed but rather returned. It is the caller's responsibility to * destroy the value after that point. * * @param aPropertyName name of property to unset. * @param aStatus out parameter for storing resulting status. * Set to NS_PROPTABLE_PROP_NOT_THERE if the property * is not set. * @return the property. Null if the property is not set * (though a null return value does not imply the * property was not set, i.e. it can be set to null). */ void* UnsetProperty(nsIAtom *aPropertyName, nsresult *aStatus = nsnull) { return UnsetProperty(0, aPropertyName, aStatus); } /** * Unset a property associated with this node. The value will not be * destroyed but rather returned. It is the caller's responsibility to * destroy the value after that point. * * @param aCategory category of property to unset. * @param aPropertyName name of property to unset. * @param aStatus out parameter for storing resulting status. * Set to NS_PROPTABLE_PROP_NOT_THERE if the property * is not set. * @return the property. Null if the property is not set * (though a null return value does not imply the * property was not set, i.e. it can be set to null). */ virtual void* UnsetProperty(PRUint16 aCategory, nsIAtom *aPropertyName, nsresult *aStatus = nsnull); PRBool HasProperties() const { return HasFlag(NODE_HAS_PROPERTIES); } /** * Return the principal of this node. This is guaranteed to never be a null * pointer. */ nsIPrincipal* NodePrincipal() const { return mNodeInfo->NodeInfoManager()->DocumentPrincipal(); } /** * Get the parent nsIContent for this node. * @return the parent, or null if no parent or the parent is not an nsIContent */ nsIContent* GetParent() const { return NS_LIKELY(mParentPtrBits & PARENT_BIT_PARENT_IS_CONTENT) ? reinterpret_cast (mParentPtrBits & ~kParentBitMask) : nsnull; } /** * Get the parent nsINode for this node. This can be either an nsIContent, * an nsIDocument or an nsIAttribute. * @return the parent node */ nsINode* GetNodeParent() const { return reinterpret_cast(mParentPtrBits & ~kParentBitMask); } /** * Adds a mutation observer to be notified when this node, or any of its * descendants, are modified. The node will hold a weak reference to the * observer, which means that it is the responsibility of the observer to * remove itself in case it dies before the node. If an observer is added * while observers are being notified, it may also be notified. In general, * adding observers while inside a notification is not a good idea. */ virtual void AddMutationObserver(nsIMutationObserver* aMutationObserver); /** * Removes a mutation observer. */ virtual void RemoveMutationObserver(nsIMutationObserver* aMutationObserver); /** * Clones this node. This needs to be overriden by all node classes. aNodeInfo * should be identical to this node's nodeInfo, except for the document which * may be different. When cloning an element, all attributes of the element * will be cloned. The children of the node will not be cloned. * * @param aNodeInfo the nodeinfo to use for the clone * @param aResult the clone */ virtual nsresult Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const = 0; /** * Checks if a node has the same ownerDocument as this one. Note that this * actually compares nodeinfo managers because nodes always have one, even * when they don't have an ownerDocument. If this function returns PR_TRUE * it doesn't mean that the nodes actually have an ownerDocument. * * @param aOther Other node to check * @return Whether the owner documents of this node and of aOther are the * same. */ PRBool HasSameOwnerDoc(nsINode *aOther) { // We compare nodeinfo managers because nodes always have one, even when // they don't have an ownerDocument. return mNodeInfo->NodeInfoManager() == aOther->mNodeInfo->NodeInfoManager(); } // This class can be extended by subclasses that wish to store more // information in the slots. class nsSlots { public: nsSlots(PtrBits aFlags) : mFlags(aFlags), mChildNodes(nsnull), mWeakReference(nsnull) { } // If needed we could remove the vtable pointer this dtor causes by // putting a DestroySlots function on nsINode virtual ~nsSlots(); /** * Storage for flags for this node. These are the same flags as the * mFlagsOrSlots member, but these are used when the slots class * is allocated. */ PtrBits mFlags; /** * A list of mutation observers */ nsTObserverArray mMutationObservers; /** * An object implementing nsIDOMNodeList for this content (childNodes) * @see nsIDOMNodeList * @see nsGenericHTMLElement::GetChildNodes * * MSVC 7 doesn't like this as an nsRefPtr */ nsChildContentList* mChildNodes; /** * Weak reference to this node */ nsNodeWeakReference* mWeakReference; }; /** * Functions for managing flags and slots */ #ifdef DEBUG nsSlots* DebugGetSlots() { return GetSlots(); } #endif PRBool HasFlag(PtrBits aFlag) const { return !!(GetFlags() & aFlag); } PtrBits GetFlags() const { return NS_UNLIKELY(HasSlots()) ? FlagsAsSlots()->mFlags : mFlagsOrSlots; } void SetFlags(PtrBits aFlagsToSet) { NS_ASSERTION(!(aFlagsToSet & (NODE_IS_ANONYMOUS | NODE_MAY_HAVE_FRAME | NODE_IS_NATIVE_ANONYMOUS_ROOT | NODE_IS_IN_ANONYMOUS_SUBTREE)) || IsNodeOfType(eCONTENT), "Flag only permitted on nsIContent nodes"); PtrBits* flags = HasSlots() ? &FlagsAsSlots()->mFlags : &mFlagsOrSlots; *flags |= aFlagsToSet; } void UnsetFlags(PtrBits aFlagsToUnset) { NS_ASSERTION(!(aFlagsToUnset & (NODE_IS_ANONYMOUS | NODE_IS_IN_ANONYMOUS_SUBTREE | NODE_IS_NATIVE_ANONYMOUS_ROOT)), "Trying to unset write-only flags"); PtrBits* flags = HasSlots() ? &FlagsAsSlots()->mFlags : &mFlagsOrSlots; *flags &= ~aFlagsToUnset; } void SetEditableFlag(PRBool aEditable) { if (aEditable) { SetFlags(NODE_IS_EDITABLE); } else { UnsetFlags(NODE_IS_EDITABLE); } } PRBool IsEditable() const { #ifdef _IMPL_NS_LAYOUT return IsEditableInternal(); #else return IsEditableExternal(); #endif } /** * Returns PR_TRUE if |this| or any of its ancestors is native anonymous. */ PRBool IsInNativeAnonymousSubtree() const { #ifdef DEBUG if (HasFlag(NODE_IS_IN_ANONYMOUS_SUBTREE)) { return PR_TRUE; } CheckNotNativeAnonymous(); return PR_FALSE; #else return HasFlag(NODE_IS_IN_ANONYMOUS_SUBTREE); #endif } /** * Get the root content of an editor. So, this node must be a descendant of * an editor. Note that this should be only used for getting input or textarea * editor's root content. This method doesn't support HTML editors. */ nsIContent* GetTextEditorRootContent(nsIEditor** aEditor = nsnull); /** * Get the nearest selection root, ie. the node that will be selected if the * user does "Select All" while the focus is in this node. Note that if this * node is not in an editor, the result comes from the nsFrameSelection that * is related to aPresShell, so the result might not be the ancestor of this * node. */ nsIContent* GetSelectionRootContent(nsIPresShell* aPresShell); virtual nsINodeList* GetChildNodesList(); nsIContent* GetSibling(PRInt32 aOffset) { nsINode *parent = GetNodeParent(); if (!parent) { return nsnull; } return parent->GetChildAt(parent->IndexOf(this) + aOffset); } nsIContent* GetLastChild() const { PRUint32 count; nsIContent* const* children = GetChildArray(&count); return count > 0 ? children[count - 1] : nsnull; } /** * Implementation is in nsIDocument.h, because it needs to cast from * nsIDocument* to nsINode*. */ nsIDocument* GetOwnerDocument() const; /** * Iterator that can be used to easily iterate over the children. This has * the same restrictions on its use as GetChildArray does. */ class ChildIterator { public: ChildIterator(const nsINode* aNode) { Init(aNode); } ChildIterator(const nsINode* aNode, PRUint32 aOffset) { Init(aNode); Advance(aOffset); } ~ChildIterator() { NS_ASSERTION(!mGuard.Mutated(0), "Unexpected mutations happened"); } PRBool IsDone() const { return mCur == mEnd; } operator nsIContent* const () { return *mCur; } void Next() { NS_PRECONDITION(mCur != mEnd, "Check IsDone"); ++mCur; } void Advance(PRUint32 aOffset) { NS_ASSERTION(mCur + aOffset <= mEnd, "Unexpected offset"); mCur += aOffset; } private: void Init(const nsINode* aNode) { NS_PRECONDITION(aNode, "Must have node here!"); PRUint32 childCount; mCur = aNode->GetChildArray(&childCount); mEnd = mCur + childCount; } #ifdef DEBUG nsMutationGuard mGuard; #endif nsIContent* const * mCur; nsIContent* const * mEnd; }; /** * The default script type (language) ID for this node. * All nodes must support fetching the default script language. */ virtual PRUint32 GetScriptTypeID() const { return nsIProgrammingLanguage::JAVASCRIPT; } /** * Not all nodes support setting a new default language. */ NS_IMETHOD SetScriptTypeID(PRUint32 aLang) { NS_NOTREACHED("SetScriptTypeID not implemented"); return NS_ERROR_NOT_IMPLEMENTED; } protected: // Override this function to create a custom slots class. virtual nsINode::nsSlots* CreateSlots(); PRBool HasSlots() const { return !(mFlagsOrSlots & NODE_DOESNT_HAVE_SLOTS); } nsSlots* FlagsAsSlots() const { NS_ASSERTION(HasSlots(), "check HasSlots first"); return reinterpret_cast(mFlagsOrSlots); } nsSlots* GetExistingSlots() const { return HasSlots() ? FlagsAsSlots() : nsnull; } nsSlots* GetSlots() { if (HasSlots()) { return FlagsAsSlots(); } nsSlots* slots = CreateSlots(); if (slots) { mFlagsOrSlots = reinterpret_cast(slots); } return slots; } nsTObserverArray *GetMutationObservers() { return HasSlots() ? &FlagsAsSlots()->mMutationObservers : nsnull; } PRBool IsEditableInternal() const; virtual PRBool IsEditableExternal() const { return IsEditableInternal(); } #ifdef DEBUG // Note: virtual so that IsInNativeAnonymousSubtree can be called accross // module boundaries. virtual void CheckNotNativeAnonymous() const; #endif nsresult GetParentNode(nsIDOMNode** aParentNode); nsresult GetChildNodes(nsIDOMNodeList** aChildNodes); nsresult GetFirstChild(nsIDOMNode** aFirstChild); nsresult GetLastChild(nsIDOMNode** aLastChild); nsresult GetPreviousSibling(nsIDOMNode** aPrevSibling); nsresult GetNextSibling(nsIDOMNode** aNextSibling); nsresult GetOwnerDocument(nsIDOMDocument** aOwnerDocument); nsCOMPtr mNodeInfo; enum { PARENT_BIT_INDOCUMENT = 1 << 0, PARENT_BIT_PARENT_IS_CONTENT = 1 << 1 }; enum { kParentBitMask = 0x3 }; PtrBits mParentPtrBits; /** * Used for either storing flags for this node or a pointer to * this contents nsContentSlots. See the definition of the * NODE_* macros for the layout of the bits in this * member. */ PtrBits mFlagsOrSlots; }; extern const nsIID kThisPtrOffsetsSID; // _implClass is the class to use to cast to nsISupports #define NS_OFFSET_AND_INTERFACE_TABLE_BEGIN_AMBIGUOUS(_class, _implClass) \ static const QITableEntry offsetAndQITable[] = { \ NS_INTERFACE_TABLE_ENTRY_AMBIGUOUS(_class, nsISupports, _implClass) #define NS_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_OFFSET_AND_INTERFACE_TABLE_BEGIN_AMBIGUOUS(_class, _class) #define NS_OFFSET_AND_INTERFACE_TABLE_END \ { nsnull, 0 } }; \ if (aIID.Equals(kThisPtrOffsetsSID)) { \ *aInstancePtr = \ const_cast(static_cast(&offsetAndQITable)); \ return NS_OK; \ } #define NS_OFFSET_AND_INTERFACE_TABLE_TO_MAP_SEGUE \ rv = NS_TableDrivenQI(this, offsetAndQITable, aIID, aInstancePtr); \ NS_INTERFACE_TABLE_TO_MAP_SEGUE // nsNodeSH::PreCreate() depends on the identity pointer being the same as // nsINode, so if you change the nsISupports line below, make sure // nsNodeSH::PreCreate() still does the right thing! #define NS_NODE_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_OFFSET_AND_INTERFACE_TABLE_BEGIN_AMBIGUOUS(_class, nsINode) \ NS_INTERFACE_TABLE_ENTRY(_class, nsINode) #define NS_NODE_INTERFACE_TABLE2(_class, _i1, _i2) \ NS_NODE_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_INTERFACE_TABLE_ENTRY(_class, _i1) \ NS_INTERFACE_TABLE_ENTRY(_class, _i2) \ NS_OFFSET_AND_INTERFACE_TABLE_END \ NS_OFFSET_AND_INTERFACE_TABLE_TO_MAP_SEGUE #define NS_NODE_INTERFACE_TABLE3(_class, _i1, _i2, _i3) \ NS_NODE_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_INTERFACE_TABLE_ENTRY(_class, _i1) \ NS_INTERFACE_TABLE_ENTRY(_class, _i2) \ NS_INTERFACE_TABLE_ENTRY(_class, _i3) \ NS_OFFSET_AND_INTERFACE_TABLE_END \ NS_OFFSET_AND_INTERFACE_TABLE_TO_MAP_SEGUE #define NS_NODE_INTERFACE_TABLE4(_class, _i1, _i2, _i3, _i4) \ NS_NODE_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_INTERFACE_TABLE_ENTRY(_class, _i1) \ NS_INTERFACE_TABLE_ENTRY(_class, _i2) \ NS_INTERFACE_TABLE_ENTRY(_class, _i3) \ NS_INTERFACE_TABLE_ENTRY(_class, _i4) \ NS_OFFSET_AND_INTERFACE_TABLE_END \ NS_OFFSET_AND_INTERFACE_TABLE_TO_MAP_SEGUE #define NS_NODE_INTERFACE_TABLE5(_class, _i1, _i2, _i3, _i4, _i5) \ NS_NODE_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_INTERFACE_TABLE_ENTRY(_class, _i1) \ NS_INTERFACE_TABLE_ENTRY(_class, _i2) \ NS_INTERFACE_TABLE_ENTRY(_class, _i3) \ NS_INTERFACE_TABLE_ENTRY(_class, _i4) \ NS_INTERFACE_TABLE_ENTRY(_class, _i5) \ NS_OFFSET_AND_INTERFACE_TABLE_END \ NS_OFFSET_AND_INTERFACE_TABLE_TO_MAP_SEGUE #define NS_NODE_INTERFACE_TABLE6(_class, _i1, _i2, _i3, _i4, _i5, _i6) \ NS_NODE_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_INTERFACE_TABLE_ENTRY(_class, _i1) \ NS_INTERFACE_TABLE_ENTRY(_class, _i2) \ NS_INTERFACE_TABLE_ENTRY(_class, _i3) \ NS_INTERFACE_TABLE_ENTRY(_class, _i4) \ NS_INTERFACE_TABLE_ENTRY(_class, _i5) \ NS_INTERFACE_TABLE_ENTRY(_class, _i6) \ NS_OFFSET_AND_INTERFACE_TABLE_END \ NS_OFFSET_AND_INTERFACE_TABLE_TO_MAP_SEGUE #define NS_NODE_INTERFACE_TABLE7(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7) \ NS_NODE_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_INTERFACE_TABLE_ENTRY(_class, _i1) \ NS_INTERFACE_TABLE_ENTRY(_class, _i2) \ NS_INTERFACE_TABLE_ENTRY(_class, _i3) \ NS_INTERFACE_TABLE_ENTRY(_class, _i4) \ NS_INTERFACE_TABLE_ENTRY(_class, _i5) \ NS_INTERFACE_TABLE_ENTRY(_class, _i6) \ NS_INTERFACE_TABLE_ENTRY(_class, _i7) \ NS_OFFSET_AND_INTERFACE_TABLE_END \ NS_OFFSET_AND_INTERFACE_TABLE_TO_MAP_SEGUE #define NS_NODE_INTERFACE_TABLE8(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, \ _i8) \ NS_NODE_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class) \ NS_INTERFACE_TABLE_ENTRY(_class, _i1) \ NS_INTERFACE_TABLE_ENTRY(_class, _i2) \ NS_INTERFACE_TABLE_ENTRY(_class, _i3) \ NS_INTERFACE_TABLE_ENTRY(_class, _i4) \ NS_INTERFACE_TABLE_ENTRY(_class, _i5) \ NS_INTERFACE_TABLE_ENTRY(_class, _i6) \ NS_INTERFACE_TABLE_ENTRY(_class, _i7) \ NS_INTERFACE_TABLE_ENTRY(_class, _i8) \ NS_OFFSET_AND_INTERFACE_TABLE_END \ NS_OFFSET_AND_INTERFACE_TABLE_TO_MAP_SEGUE NS_DEFINE_STATIC_IID_ACCESSOR(nsINode, NS_INODE_IID) #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_PRESERVED_WRAPPER \ tmp->TraverseWrapper(cb); #define NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER \ tmp->ReleaseWrapper(); #endif /* nsINode_h___ */