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89c081734f
gecko/content/base/public/nsContentUtils.h
peterv@propagandism.org 89c081734f Backing out to fix orange.
2007-10-26 07:15:28 -07:00

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/* -*- 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 Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 ***** */
/* A namespace class for static content utilities. */
#ifndef nsContentUtils_h___
#define nsContentUtils_h___
#include "jspubtd.h"
#include "nsAString.h"
#include "nsIStatefulFrame.h"
#include "nsIPref.h"
#include "nsINodeInfo.h"
#include "nsNodeInfoManager.h"
#include "nsContentList.h"
#include "nsDOMClassInfoID.h"
#include "nsIClassInfo.h"
#include "nsIDOM3Node.h"
#include "nsDataHashtable.h"
#include "nsIScriptRuntime.h"
#include "nsIScriptGlobalObject.h"
class nsIDOMScriptObjectFactory;
class nsIXPConnect;
class nsINode;
class nsIContent;
class nsIDOMNode;
class nsIDocument;
class nsIDocShell;
class nsINameSpaceManager;
class nsIScriptSecurityManager;
class nsIJSContextStack;
class nsIThreadJSContextStack;
class nsIParserService;
class nsIIOService;
class nsIURI;
class imgIDecoderObserver;
class imgIRequest;
class imgILoader;
class nsIPrefBranch;
class nsIImage;
class nsIImageLoadingContent;
class nsIDOMHTMLFormElement;
class nsIDOMDocument;
class nsIConsoleService;
class nsIStringBundleService;
class nsIStringBundle;
class nsIContentPolicy;
class nsILineBreaker;
class nsIWordBreaker;
class nsIJSRuntimeService;
class nsIEventListenerManager;
class nsIScriptContext;
template<class E> class nsCOMArray;
class nsIPref;
class nsVoidArray;
struct JSRuntime;
class nsICaseConversion;
#ifdef MOZ_XTF
class nsIXTFService;
#endif
#ifdef IBMBIDI
class nsIBidiKeyboard;
#endif
extern const char kLoadAsData[];
enum EventNameType {
EventNameType_None = 0x0000,
EventNameType_HTML = 0x0001,
EventNameType_XUL = 0x0002,
EventNameType_SVGGraphic = 0x0004, // svg graphic elements
EventNameType_SVGSVG = 0x0008, // the svg element
EventNameType_HTMLXUL = 0x0003,
EventNameType_All = 0xFFFF
};
struct EventNameMapping {
PRUint32 mId;
PRInt32 mType;
};
class nsContentUtils
{
public:
static nsresult Init();
// You MUST pass the old ownerDocument of aContent in as aOldDocument and the
// new one as aNewDocument. aNewParent is allowed to be null; in that case
// aNewDocument will be assumed to be the parent. Note that at this point
// the actual ownerDocument of aContent may not yet be aNewDocument.
// XXXbz but then if it gets wrapped after we do this call but before its
// ownerDocument actually changes, things will break...
static nsresult ReparentContentWrapper(nsIContent *aNode,
nsIContent *aNewParent,
nsIDocument *aNewDocument,
nsIDocument *aOldDocument);
/**
* Get a scope from aOldDocument and one from aNewDocument. Also get a
* context through one of the scopes, from the stack or the safe context.
*
* @param aOldDocument The document to get aOldScope from.
* @param aNewDocument The document to get aNewScope from.
* @param aCx [out] Context gotten through one of the scopes, from the stack
* or the safe context.
* @param aOldScope [out] Scope gotten from aOldDocument.
* @param aNewScope [out] Scope gotten from aNewDocument.
*/
static nsresult GetContextAndScopes(nsIDocument *aOldDocument,
nsIDocument *aNewDocument,
JSContext **aCx, JSObject **aOldScope,
JSObject **aNewScope);
/**
* When a document's scope changes (e.g., from document.open(), call this
* function to move all content wrappers from the old scope to the new one.
*/
static nsresult ReparentContentWrappersInScope(nsIScriptGlobalObject *aOldScope,
nsIScriptGlobalObject *aNewScope);
static PRBool IsCallerChrome();
static PRBool IsCallerTrustedForRead();
static PRBool IsCallerTrustedForWrite();
/**
* Do not ever pass null pointers to this method. If one of your
* nsIContents is null, you have to decide for yourself what
* "IsDescendantOf" really means.
*
* @param aPossibleDescendant node to test for being a descendant of
* aPossibleAncestor
* @param aPossibleAncestor node to test for being an ancestor of
* aPossibleDescendant
* @return PR_TRUE if aPossibleDescendant is a descendant of
* aPossibleAncestor (or is aPossibleAncestor). PR_FALSE
* otherwise.
*/
static PRBool ContentIsDescendantOf(nsINode* aPossibleDescendant,
nsINode* aPossibleAncestor);
/*
* This method fills the |aArray| with all ancestor nodes of |aNode|
* including |aNode| at the zero index.
*
* These elements were |nsIDOMNode*|s before casting to |void*| and must
* be cast back to |nsIDOMNode*| on usage, or bad things will happen.
*/
static nsresult GetAncestors(nsIDOMNode* aNode,
nsVoidArray* aArray);
/*
* This method fills |aAncestorNodes| with all ancestor nodes of |aNode|
* including |aNode| (QI'd to nsIContent) at the zero index.
* For each ancestor, there is a corresponding element in |aAncestorOffsets|
* which is the IndexOf the child in relation to its parent.
*
* The elements of |aAncestorNodes| were |nsIContent*|s before casting to
* |void*| and must be cast back to |nsIContent*| on usage, or bad things
* will happen.
*
* This method just sucks.
*/
static nsresult GetAncestorsAndOffsets(nsIDOMNode* aNode,
PRInt32 aOffset,
nsVoidArray* aAncestorNodes,
nsVoidArray* aAncestorOffsets);
/*
* The out parameter, |aCommonAncestor| will be the closest node, if any,
* to both |aNode| and |aOther| which is also an ancestor of each.
* Returns an error if the two nodes are disconnected and don't have
* a common ancestor.
*/
static nsresult GetCommonAncestor(nsIDOMNode *aNode,
nsIDOMNode *aOther,
nsIDOMNode** aCommonAncestor);
/**
* Returns the common ancestor, if any, for two nodes. Returns null if the
* nodes are disconnected.
*/
static nsINode* GetCommonAncestor(nsINode* aNode1,
nsINode* aNode2);
/**
* Compares the document position of nodes.
*
* @param aNode1 The node whose position is being compared to the reference
* node
* @param aNode2 The reference node
*
* @return The document position flags of the nodes. aNode1 is compared to
* aNode2, i.e. if aNode1 is before aNode2 then
* DOCUMENT_POSITION_PRECEDING will be set.
*
* @see nsIDOMNode
* @see nsIDOM3Node
*/
static PRUint16 ComparePosition(nsINode* aNode1,
nsINode* aNode2);
/**
* Returns true if aNode1 is before aNode2 in the same connected
* tree.
*/
static PRBool PositionIsBefore(nsINode* aNode1,
nsINode* aNode2)
{
return (ComparePosition(aNode1, aNode2) &
(nsIDOM3Node::DOCUMENT_POSITION_PRECEDING |
nsIDOM3Node::DOCUMENT_POSITION_DISCONNECTED)) ==
nsIDOM3Node::DOCUMENT_POSITION_PRECEDING;
}
/**
* Utility routine to compare two "points", where a point is a
* node/offset pair
* Returns -1 if point1 < point2, 1, if point1 > point2,
* 0 if error or if point1 == point2.
* NOTE! The two nodes MUST be in the same connected subtree!
* if they are not the result is undefined.
*/
static PRInt32 ComparePoints(nsINode* aParent1, PRInt32 aOffset1,
nsINode* aParent2, PRInt32 aOffset2);
/**
* Find the first child of aParent with a resolved tag matching
* aNamespace and aTag. Both the explicit and anonymous children of
* aParent are examined. The return value is not addrefed.
*
* XXXndeakin this should return the first child whether in anonymous or
* explicit children, but currently XBL doesn't tell us the relative
* ordering of anonymous vs explicit children, so instead it searches
* the explicit children first then the anonymous children.
*/
static nsIContent* FindFirstChildWithResolvedTag(nsIContent* aParent,
PRInt32 aNamespace,
nsIAtom* aTag);
/**
* Brute-force search of the element subtree rooted at aContent for
* an element with the given id. aId must be nonempty, otherwise
* this method may return nodes even if they have no id!
*/
static nsIContent* MatchElementId(nsIContent *aContent,
const nsAString& aId);
/**
* Similar to above, but to be used if one already has an atom for the ID
*/
static nsIContent* MatchElementId(nsIContent *aContent,
nsIAtom* aId);
/**
* Given a URI containing an element reference (#whatever),
* resolve it to the target content element with the given ID.
*
* If aFromContent is anonymous XBL content then the URI
* must refer to its binding document and we will return
* a node in the same anonymous content subtree as aFromContent,
* if one exists with the correct ID.
*
* @param aFromContent the context of the reference;
* currently we only support references to elements in the
* same document as the context, so this must be non-null
*
* @return the element, or nsnull on failure
*/
static nsIContent* GetReferencedElement(nsIURI* aURI,
nsIContent *aFromContent);
/**
* Reverses the document position flags passed in.
*
* @param aDocumentPosition The document position flags to be reversed.
*
* @return The reversed document position flags.
*
* @see nsIDOMNode
* @see nsIDOM3Node
*/
static PRUint16 ReverseDocumentPosition(PRUint16 aDocumentPosition);
static PRUint32 CopyNewlineNormalizedUnicodeTo(const nsAString& aSource,
PRUint32 aSrcOffset,
PRUnichar* aDest,
PRUint32 aLength,
PRBool& aLastCharCR);
static PRUint32 CopyNewlineNormalizedUnicodeTo(nsReadingIterator<PRUnichar>& aSrcStart, const nsReadingIterator<PRUnichar>& aSrcEnd, nsAString& aDest);
static nsISupports *
GetClassInfoInstance(nsDOMClassInfoID aID);
static const nsDependentSubstring TrimCharsInSet(const char* aSet,
const nsAString& aValue);
static const nsDependentSubstring TrimWhitespace(const nsAString& aStr,
PRBool aTrimTrailing = PR_TRUE);
static void Shutdown();
/**
* Checks whether two nodes come from the same origin. aTrustedNode is
* considered 'safe' in that a user can operate on it and that it isn't
* a js-object that implements nsIDOMNode.
* Never call this function with the first node provided by script, it
* must always be known to be a 'real' node!
*/
static nsresult CheckSameOrigin(nsIDOMNode* aTrustedNode,
nsIDOMNode* aUnTrustedNode);
// Check if the (JS) caller can access aNode.
static PRBool CanCallerAccess(nsIDOMNode *aNode);
/**
* Get the docshell through the JS context that's currently on the stack.
* If there's no JS context currently on the stack aDocShell will be null.
*
* @param aDocShell The docshell or null if no JS context
*/
static nsIDocShell *GetDocShellFromCaller();
/**
* The two GetDocumentFrom* functions below allow a caller to get at a
* document that is relevant to the currently executing script.
*
* GetDocumentFromCaller gets its document by looking at the last called
* function and finding the document that the function itself relates to.
* For example, consider two windows A and B in the same origin. B has a
* function which does something that ends up needing the current document.
* If a script in window A were to call B's function, GetDocumentFromCaller
* would find that function (in B) and return B's document.
*
* GetDocumentFromContext gets its document by looking at the currently
* executing context's global object and returning its document. Thus,
* given the example above, GetDocumentFromCaller would see that the
* currently executing script was in window A, and return A's document.
*/
/**
* Get the document from the currently executing function. This will return
* the document that the currently executing function is in/from.
*
* @return The document or null if no JS Context.
*/
static nsIDOMDocument *GetDocumentFromCaller();
/**
* Get the document through the JS context that's currently on the stack.
* If there's no JS context currently on the stack it will return null.
* This will return the document of the calling script.
*
* @return The document or null if no JS context
*/
static nsIDOMDocument *GetDocumentFromContext();
// Check if a node is in the document prolog, i.e. before the document
// element.
static PRBool InProlog(nsINode *aNode);
static nsIParserService* GetParserService();
static nsINameSpaceManager* NameSpaceManager()
{
return sNameSpaceManager;
}
static nsIIOService* GetIOService()
{
return sIOService;
}
static imgILoader* GetImgLoader()
{
return sImgLoader;
}
#ifdef MOZ_XTF
static nsIXTFService* GetXTFService();
#endif
#ifdef IBMBIDI
static nsIBidiKeyboard* GetBidiKeyboard();
#endif
/**
* Get the cache security manager service. Can return null if the layout
* module has been shut down.
*/
static nsIScriptSecurityManager* GetSecurityManager()
{
return sSecurityManager;
}
static nsresult GenerateStateKey(nsIContent* aContent,
nsIDocument* aDocument,
nsIStatefulFrame::SpecialStateID aID,
nsACString& aKey);
/**
* Create a new nsIURI from aSpec, using aBaseURI as the base. The
* origin charset of the new nsIURI will be the document charset of
* aDocument.
*/
static nsresult NewURIWithDocumentCharset(nsIURI** aResult,
const nsAString& aSpec,
nsIDocument* aDocument,
nsIURI* aBaseURI);
/**
* Convert aInput (in charset aCharset) to UTF16 in aOutput.
*
* @param aCharset the name of the charset; if empty, we assume UTF8
*/
static nsresult ConvertStringFromCharset(const nsACString& aCharset,
const nsACString& aInput,
nsAString& aOutput);
/**
* Determine whether aContent is in some way associated with aForm. If the
* form is a container the only elements that are considered to be associated
* with a form are the elements that are contained within the form. If the
* form is a leaf element then all elements will be accepted into this list,
* since this can happen due to content fixup when a form spans table rows or
* table cells.
*/
static PRBool BelongsInForm(nsIDOMHTMLFormElement *aForm,
nsIContent *aContent);
static nsresult CheckQName(const nsAString& aQualifiedName,
PRBool aNamespaceAware = PR_TRUE);
static nsresult SplitQName(nsIContent* aNamespaceResolver,
const nsAFlatString& aQName,
PRInt32 *aNamespace, nsIAtom **aLocalName);
static nsresult LookupNamespaceURI(nsIContent* aNamespaceResolver,
const nsAString& aNamespacePrefix,
nsAString& aNamespaceURI);
static nsresult GetNodeInfoFromQName(const nsAString& aNamespaceURI,
const nsAString& aQualifiedName,
nsNodeInfoManager* aNodeInfoManager,
nsINodeInfo** aNodeInfo);
static void SplitExpatName(const PRUnichar *aExpatName, nsIAtom **aPrefix,
nsIAtom **aTagName, PRInt32 *aNameSpaceID);
static nsAdoptingCString GetCharPref(const char *aPref);
static PRPackedBool GetBoolPref(const char *aPref,
PRBool aDefault = PR_FALSE);
static PRInt32 GetIntPref(const char *aPref, PRInt32 aDefault = 0);
static nsAdoptingString GetLocalizedStringPref(const char *aPref);
static nsAdoptingString GetStringPref(const char *aPref);
static void RegisterPrefCallback(const char *aPref,
PrefChangedFunc aCallback,
void * aClosure);
static void UnregisterPrefCallback(const char *aPref,
PrefChangedFunc aCallback,
void * aClosure);
static nsIPrefBranch *GetPrefBranch()
{
return sPrefBranch;
}
static nsILineBreaker* LineBreaker()
{
return sLineBreaker;
}
static nsIWordBreaker* WordBreaker()
{
return sWordBreaker;
}
static nsICaseConversion* GetCaseConv()
{
return sCaseConv;
}
/**
* @return PR_TRUE if aContent has an attribute aName in namespace aNameSpaceID,
* and the attribute value is non-empty.
*/
static PRBool HasNonEmptyAttr(nsIContent* aContent, PRInt32 aNameSpaceID,
nsIAtom* aName);
/**
* Method that gets the primary presContext for the node.
*
* @param aContent The content node.
* @return the presContext, or nsnull if the content is not in a document
* (if GetCurrentDoc returns nsnull)
*/
static nsPresContext* GetContextForContent(nsIContent* aContent);
/**
* Method to do security and content policy checks on the image URI
*
* @param aURI uri of the image to be loaded
* @param aContext the context the image is loaded in (eg an element)
* @param aLoadingDocument the document we belong to
* @param aLoadingPrincipal the principal doing the load
* @param aImageBlockingStatus the nsIContentPolicy blocking status for this
* image. This will be set even if a security check fails for the
* image, to some reasonable REJECT_* value. This out param will only
* be set if it's non-null.
* @return PR_TRUE if the load can proceed, or PR_FALSE if it is blocked.
* Note that aImageBlockingStatus, if set will always be an ACCEPT
* status if PR_TRUE is returned and always be a REJECT_* status if
* PR_FALSE is returned.
*/
static PRBool CanLoadImage(nsIURI* aURI,
nsISupports* aContext,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal,
PRInt16* aImageBlockingStatus = nsnull);
/**
* Method to start an image load. This does not do any security checks.
*
* @param aURI uri of the image to be loaded
* @param aLoadingDocument the document we belong to
* @param aLoadingPrincipal the principal doing the load
* @param aReferrer the referrer URI
* @param aObserver the observer for the image load
* @param aLoadFlags the load flags to use. See nsIRequest
* @return the imgIRequest for the image load
*/
static nsresult LoadImage(nsIURI* aURI,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal,
nsIURI* aReferrer,
imgIDecoderObserver* aObserver,
PRInt32 aLoadFlags,
imgIRequest** aRequest);
/**
* Method to get an nsIImage from an image loading content
*
* @param aContent The image loading content. Must not be null.
* @param aRequest The image request [out]
* @return the nsIImage corresponding to the first frame of the image
*/
static already_AddRefed<nsIImage> GetImageFromContent(nsIImageLoadingContent* aContent, imgIRequest **aRequest = nsnull);
/**
* Method that decides whether a content node is draggable
*
* @param aContent The content node to test.
* @return whether it's draggable
*/
static PRBool ContentIsDraggable(nsIContent* aContent) {
return IsDraggableImage(aContent) || IsDraggableLink(aContent);
}
/**
* Method that decides whether a content node is a draggable image
*
* @param aContent The content node to test.
* @return whether it's a draggable image
*/
static PRBool IsDraggableImage(nsIContent* aContent);
/**
* Method that decides whether a content node is a draggable link
*
* @param aContent The content node to test.
* @return whether it's a draggable link
*/
static PRBool IsDraggableLink(nsIContent* aContent);
/**
* Convenience method to create a new nodeinfo that differs only by name
* from aNodeInfo.
*/
static nsresult NameChanged(nsINodeInfo *aNodeInfo, nsIAtom *aName,
nsINodeInfo** aResult)
{
nsNodeInfoManager *niMgr = aNodeInfo->NodeInfoManager();
return niMgr->GetNodeInfo(aName, aNodeInfo->GetPrefixAtom(),
aNodeInfo->NamespaceID(), aResult);
}
/**
* Convenience method to create a new nodeinfo that differs only by prefix
* from aNodeInfo.
*/
static nsresult PrefixChanged(nsINodeInfo *aNodeInfo, nsIAtom *aPrefix,
nsINodeInfo** aResult)
{
nsNodeInfoManager *niMgr = aNodeInfo->NodeInfoManager();
return niMgr->GetNodeInfo(aNodeInfo->NameAtom(), aPrefix,
aNodeInfo->NamespaceID(), aResult);
}
/**
* Returns the appropriate event argument names for the specified
* namespace and event name. Added because we need to switch between
* SVG's "evt" and the rest of the world's "event", and because onerror
* takes 3 args.
*/
static void GetEventArgNames(PRInt32 aNameSpaceID, nsIAtom *aEventName,
PRUint32 *aArgCount, const char*** aArgNames);
/**
* If aNode is not an element, return true exactly when aContent's binding
* parent is null.
*
* If aNode is an element, return true exactly when aContent's binding parent
* is the same as aNode's.
*
* This method is particularly useful for callers who are trying to ensure
* that they are working with a non-anonymous descendant of a given node. If
* aContent is a descendant of aNode, a return value of PR_FALSE from this
* method means that it's an anonymous descendant from aNode's point of view.
*
* Both arguments to this method must be non-null.
*/
static PRBool IsInSameAnonymousTree(nsINode* aNode, nsIContent* aContent);
/**
* Return the nsIXPConnect service.
*/
static nsIXPConnect *XPConnect()
{
return sXPConnect;
}
/**
* Report a localized error message to the error console.
* @param aFile Properties file containing localized message.
* @param aMessageName Name of localized message.
* @param aParams Parameters to be substituted into localized message.
* @param aParamsLength Length of aParams.
* @param aURI URI of resource containing error (may be null).
* @param aSourceLine The text of the line that contains the error (may be
empty).
* @param aLineNumber Line number within resource containing error.
* @param aColumnNumber Column number within resource containing error.
* @param aErrorFlags See nsIScriptError.
* @param aCategory Name of module reporting error.
*/
enum PropertiesFile {
eCSS_PROPERTIES,
eXBL_PROPERTIES,
eXUL_PROPERTIES,
eLAYOUT_PROPERTIES,
eFORMS_PROPERTIES,
ePRINTING_PROPERTIES,
eDOM_PROPERTIES,
#ifdef MOZ_SVG
eSVG_PROPERTIES,
#endif
eBRAND_PROPERTIES,
eCOMMON_DIALOG_PROPERTIES,
PropertiesFile_COUNT
};
static nsresult ReportToConsole(PropertiesFile aFile,
const char *aMessageName,
const PRUnichar **aParams,
PRUint32 aParamsLength,
nsIURI* aURI,
const nsAFlatString& aSourceLine,
PRUint32 aLineNumber,
PRUint32 aColumnNumber,
PRUint32 aErrorFlags,
const char *aCategory);
/**
* Get the localized string named |aKey| in properties file |aFile|.
*/
static nsresult GetLocalizedString(PropertiesFile aFile,
const char* aKey,
nsXPIDLString& aResult);
/**
* Fill (with the parameters given) the localized string named |aKey| in
* properties file |aFile|.
*/
static nsresult FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const PRUnichar **aParams,
PRUint32 aParamsLength,
nsXPIDLString& aResult);
/**
* Returns true if aDocument is a chrome document
*/
static PRBool IsChromeDoc(nsIDocument *aDocument);
/**
* Notify XPConnect if an exception is pending on aCx.
*/
static void NotifyXPCIfExceptionPending(JSContext *aCx);
/**
* Release *aSupportsPtr when the shutdown notification is received
*/
static nsresult ReleasePtrOnShutdown(nsISupports** aSupportsPtr) {
NS_ASSERTION(aSupportsPtr, "Expect to crash!");
NS_ASSERTION(*aSupportsPtr, "Expect to crash!");
return sPtrsToPtrsToRelease->AppendElement(aSupportsPtr) ? NS_OK :
NS_ERROR_OUT_OF_MEMORY;
}
/**
* Return the content policy service
*/
static nsIContentPolicy *GetContentPolicy();
/**
* Make sure that whatever value *aPtr contains at any given moment is
* protected from JS GC until we remove the GC root. A call to this that
* succeeds MUST be matched by a call to RemoveJSGCRoot to avoid leaking.
*/
static nsresult AddJSGCRoot(jsval* aPtr, const char* aName) {
return AddJSGCRoot((void*)aPtr, aName);
}
/**
* Make sure that whatever object *aPtr is pointing to at any given moment is
* protected from JS GC until we remove the GC root. A call to this that
* succeeds MUST be matched by a call to RemoveJSGCRoot to avoid leaking.
*/
static nsresult AddJSGCRoot(JSObject** aPtr, const char* aName) {
return AddJSGCRoot((void*)aPtr, aName);
}
/**
* Make sure that whatever object *aPtr is pointing to at any given moment is
* protected from JS GC until we remove the GC root. A call to this that
* succeeds MUST be matched by a call to RemoveJSGCRoot to avoid leaking.
*/
static nsresult AddJSGCRoot(void* aPtr, const char* aName);
/**
* Remove aPtr as a JS GC root
*/
static nsresult RemoveJSGCRoot(jsval* aPtr) {
return RemoveJSGCRoot((void*)aPtr);
}
static nsresult RemoveJSGCRoot(JSObject** aPtr) {
return RemoveJSGCRoot((void*)aPtr);
}
static nsresult RemoveJSGCRoot(void* aPtr);
/**
* Quick helper to determine whether there are any mutation listeners
* of a given type that apply to this content or any of its ancestors.
* The method has the side effect to call document's MayDispatchMutationEvent
* using aTargetForSubtreeModified as the parameter.
*
* @param aNode The node to search for listeners
* @param aType The type of listener (NS_EVENT_BITS_MUTATION_*)
* @param aTargetForSubtreeModified The node which is the target of the
* possible DOMSubtreeModified event.
*
* @return true if there are mutation listeners of the specified type
*/
static PRBool HasMutationListeners(nsINode* aNode,
PRUint32 aType,
nsINode* aTargetForSubtreeModified);
/**
* This method creates and dispatches a trusted event.
* Works only with events which can be created by calling
* nsIDOMDocumentEvent::CreateEvent() with parameter "Events".
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* nsIDOMEventTarget.
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see nsIDOMEventTarget::DispatchEvent.
*/
static nsresult DispatchTrustedEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
PRBool aCanBubble,
PRBool aCancelable,
PRBool *aDefaultAction = nsnull);
/**
* Determines if an event attribute name (such as onclick) is valid for
* a given element type. Types are from the EventNameType enumeration
* defined above.
*
* @param aName the event name to look up
* @param aType the type of content
*/
static PRBool IsEventAttributeName(nsIAtom* aName, PRInt32 aType);
/**
* Return the event id for the event with the given name. The name is the
* event name with the 'on' prefix. Returns NS_USER_DEFINED_EVENT if the
* event doesn't match a known event name.
*
* @param aName the event name to look up
*/
static PRUint32 GetEventId(nsIAtom* aName);
/**
* Used only during traversal of the XPCOM graph by the cycle
* collector: push a pointer to the listener manager onto the
* children deque, if it exists. Do nothing if there is no listener
* manager.
*
* Crucially: does not perform any refcounting operations.
*
* @param aNode The node to traverse.
* @param children The buffer to push a listener manager pointer into.
*/
static void TraverseListenerManager(nsINode *aNode,
nsCycleCollectionTraversalCallback &cb);
/**
* Get the eventlistener manager for aNode. If a new eventlistener manager
* was created, aCreated is set to PR_TRUE.
*
* @param aNode The node for which to get the eventlistener manager.
* @param aCreateIfNotFound If PR_FALSE, returns a listener manager only if
* one already exists.
* @param aResult [out] Set to the eventlistener manager for aNode.
*/
static nsresult GetListenerManager(nsINode *aNode,
PRBool aCreateIfNotFound,
nsIEventListenerManager **aResult);
/**
* Remove the eventlistener manager for aNode.
*
* @param aNode The node for which to remove the eventlistener manager.
*/
static void RemoveListenerManager(nsINode *aNode);
static PRBool IsInitialized()
{
return sInitialized;
}
/**
* Checks if the localname/prefix/namespace triple is valid wrt prefix
* and namespace according to the Namespaces in XML and DOM Code
* specfications.
*
* @param aLocalname localname of the node
* @param aPrefix prefix of the node
* @param aNamespaceID namespace of the node
*/
static PRBool IsValidNodeName(nsIAtom *aLocalName, nsIAtom *aPrefix,
PRInt32 aNamespaceID);
/**
* Creates a DocumentFragment from text using a context node to resolve
* namespaces.
*
* @param aContextNode the node which is used to resolve namespaces
* @param aFragment the string which is parsed to a DocumentFragment
* @param aReturn [out] the created DocumentFragment
*/
static nsresult CreateContextualFragment(nsIDOMNode* aContextNode,
const nsAString& aFragment,
nsIDOMDocumentFragment** aReturn);
/**
* Creates a new XML document, which is marked to be loaded as data.
*
* @param aNamespaceURI Namespace for the root element to create and insert in
* the document. Only used if aQualifiedName is not
* empty.
* @param aQualifiedName Qualified name for the root element to create and
* insert in the document. If empty no root element will
* be created.
* @param aDoctype Doctype node to insert in the document.
* @param aDocumentURI URI of the document. Must not be null.
* @param aBaseURI Base URI of the document. Must not be null.
* @param aPrincipal Prinicpal of the document. Must not be null.
* @param aScriptObject The object from which the context for event handling
* can be got.
* @param aResult [out] The document that was created.
*/
static nsresult CreateDocument(const nsAString& aNamespaceURI,
const nsAString& aQualifiedName,
nsIDOMDocumentType* aDoctype,
nsIURI* aDocumentURI,
nsIURI* aBaseURI,
nsIPrincipal* aPrincipal,
nsIScriptGlobalObject* aScriptObject,
nsIDOMDocument** aResult);
/**
* Sets the text contents of a node by replacing all existing children
* with a single text child.
*
* The function always notifies.
*
* Will reuse the first text child if one is available. Will not reuse
* existing cdata children.
*
* @param aContent Node to set contents of.
* @param aValue Value to set contents to.
* @param aTryReuse When true, the function will try to reuse an existing
* textnodes rather than always creating a new one.
*/
static nsresult SetNodeTextContent(nsIContent* aContent,
const nsAString& aValue,
PRBool aTryReuse);
/**
* Get the textual contents of a node. This is a concatination of all
* textnodes that are direct or (depending on aDeep) indirect children
* of the node.
*
* NOTE! No serialization takes place and <br> elements
* are not converted into newlines. Only textnodes and cdata nodes are
* added to the result.
*
* @param aNode Node to get textual contents of.
* @param aDeep If true child elements of aNode are recursivly descended
* into to find text children.
* @param aResult the result. Out param.
*/
static void GetNodeTextContent(nsINode* aNode, PRBool aDeep,
nsAString& aResult)
{
aResult.Truncate();
AppendNodeTextContent(aNode, aDeep, aResult);
}
/**
* Same as GetNodeTextContents but appends the result rather than sets it.
*/
static void AppendNodeTextContent(nsINode* aNode, PRBool aDeep,
nsAString& aResult);
/**
* Utility method that checks if a given node has any non-empty
* children.
* NOTE! This method does not descend recursivly into elements.
* Though it would be easy to make it so if needed
*/
static PRBool HasNonEmptyTextContent(nsINode* aNode);
/**
* Delete strings allocated for nsContentList matches
*/
static void DestroyMatchString(void* aData)
{
if (aData) {
nsString* matchString = static_cast<nsString*>(aData);
delete matchString;
}
}
/**
* Unbinds the content from the tree and nulls it out if it's not null.
*/
static void DestroyAnonymousContent(nsCOMPtr<nsIContent>* aContent);
static nsresult HoldScriptObject(PRUint32 aLangID, void *aObject);
static nsresult DropScriptObject(PRUint32 aLangID, void *aObject);
class ScriptObjectHolder
{
public:
ScriptObjectHolder(PRUint32 aLangID) : mLangID(aLangID),
mObject(nsnull)
{
MOZ_COUNT_CTOR(ScriptObjectHolder);
}
~ScriptObjectHolder()
{
MOZ_COUNT_DTOR(ScriptObjectHolder);
if (mObject)
DropScriptObject(mLangID, mObject);
}
nsresult set(void *aObject)
{
NS_ASSERTION(aObject, "unexpected null object");
NS_ASSERTION(!mObject, "already have an object");
nsresult rv = HoldScriptObject(mLangID, aObject);
if (NS_SUCCEEDED(rv)) {
mObject = aObject;
}
return rv;
}
void traverse(nsCycleCollectionTraversalCallback &cb)
{
cb.NoteScriptChild(mLangID, mObject);
}
PRUint32 mLangID;
void *mObject;
};
/**
* Convert nsIContent::IME_STATUS_* to nsIKBStateControll::IME_STATUS_*
*/
static PRUint32 GetKBStateControlStatusFromIMEStatus(PRUint32 aState);
/*
* Notify when the first XUL menu is opened and when the all XUL menus are
* closed. At opening, aInstalling should be TRUE, otherwise, it should be
* FALSE.
*/
static void NotifyInstalledMenuKeyboardListener(PRBool aInstalling);
/**
* Do security checks before loading a resource. Does the following checks:
* nsIScriptSecurityManager::CheckLoadURIWithPrincipal
* NS_CheckContentLoadPolicy
* nsIScriptSecurityManager::CheckSameOriginURI
*
* You will still need to do at least SameOrigin checks before on redirects.
*
* @param aURIToLoad URI that is getting loaded.
* @param aLoadingPrincipal Principal of the resource that is initiating
* the load
* @param aCheckLoadFlags Flags to be passed to
* nsIScriptSecurityManager::CheckLoadURIWithPrincipal
* NOTE: If this contains ALLOW_CHROME the
* CheckSameOriginURI check will be skipped if
* aURIToLoad is a chrome uri.
* @param aAllowData Set to true to skip CheckSameOriginURI check when
aURIToLoad is a data uri.
* @param aContentPolicyType Type \
* @param aContext Context |- to be passed to
* @param aMimeGuess Mimetype | NS_CheckContentLoadPolicy
* @param aExtra Extra /
*/
static nsresult CheckSecurityBeforeLoad(nsIURI* aURIToLoad,
nsIPrincipal* aLoadingPrincipal,
PRUint32 aCheckLoadFlags,
PRBool aAllowData,
PRUint32 aContentPolicyType,
nsISupports* aContext,
const nsACString& aMimeGuess = EmptyCString(),
nsISupports* aExtra = nsnull);
/**
* Trigger a link with uri aLinkURI. If aClick is false, this triggers a
* mouseover on the link, otherwise it triggers a load after doing a
* security check using aContent's principal.
*
* @param aContent the node on which a link was triggered.
* @param aPresContext the pres context, must be non-null.
* @param aLinkURI the URI of the link, must be non-null.
* @param aTargetSpec the target (like target=, may be empty).
* @param aClick whether this was a click or not (if false, this method
* assumes you just hovered over the link).
* @param aIsUserTriggered whether the user triggered the link. This would be
* false for loads from auto XLinks or from the
* click() method if we ever implement it.
*/
static void TriggerLink(nsIContent *aContent, nsPresContext *aPresContext,
nsIURI *aLinkURI, const nsString& aTargetSpec,
PRBool aClick, PRBool aIsUserTriggered);
/**
* Return true if aContent or one of its ancestors in the
* bindingParent chain is native anonymous.
*/
static PRBool IsNativeAnonymous(nsIContent* aContent);
private:
static PRBool InitializeEventTable();
static nsresult doReparentContentWrapper(nsIContent *aChild,
JSContext *cx,
JSObject *aOldGlobal,
JSObject *aNewGlobal,
nsIDocument *aOldDocument,
nsIDocument *aNewDocument);
static nsresult EnsureStringBundle(PropertiesFile aFile);
static nsIDOMScriptObjectFactory *GetDOMScriptObjectFactory();
static nsIDOMScriptObjectFactory *sDOMScriptObjectFactory;
static nsIXPConnect *sXPConnect;
static nsIScriptSecurityManager *sSecurityManager;
static nsIThreadJSContextStack *sThreadJSContextStack;
static nsIParserService *sParserService;
static nsINameSpaceManager *sNameSpaceManager;
static nsIIOService *sIOService;
#ifdef MOZ_XTF
static nsIXTFService *sXTFService;
#endif
static nsIPrefBranch *sPrefBranch;
static nsIPref *sPref;
static imgILoader* sImgLoader;
static nsIConsoleService* sConsoleService;
static nsDataHashtable<nsISupportsHashKey, EventNameMapping>* sEventTable;
static nsIStringBundleService* sStringBundleService;
static nsIStringBundle* sStringBundles[PropertiesFile_COUNT];
static nsIContentPolicy* sContentPolicyService;
static PRBool sTriedToGetContentPolicy;
static nsILineBreaker* sLineBreaker;
static nsIWordBreaker* sWordBreaker;
static nsICaseConversion* sCaseConv;
// Holds pointers to nsISupports* that should be released at shutdown
static nsVoidArray* sPtrsToPtrsToRelease;
// For now, we don't want to automatically clean this up in Shutdown(), since
// consumers might unfortunately end up wanting to use it after that
static nsIJSRuntimeService* sJSRuntimeService;
static JSRuntime* sJSScriptRuntime;
static PRInt32 sJSScriptRootCount;
static nsIScriptRuntime* sScriptRuntimes[NS_STID_ARRAY_UBOUND];
static PRInt32 sScriptRootCount[NS_STID_ARRAY_UBOUND];
#ifdef IBMBIDI
static nsIBidiKeyboard* sBidiKeyboard;
#endif
static PRBool sInitialized;
};
class nsCxPusher
{
public:
nsCxPusher();
~nsCxPusher(); // Calls Pop();
// Returns PR_FALSE if something erroneous happened.
PRBool Push(nsISupports *aCurrentTarget);
void Pop();
private:
nsCOMPtr<nsIJSContextStack> mStack;
nsCOMPtr<nsIScriptContext> mScx;
PRBool mScriptIsRunning;
};
class nsAutoGCRoot {
public:
// aPtr should be the pointer to the jsval we want to protect
nsAutoGCRoot(jsval* aPtr, nsresult* aResult) :
mPtr(aPtr)
{
mResult = *aResult =
nsContentUtils::AddJSGCRoot(aPtr, "nsAutoGCRoot");
}
// aPtr should be the pointer to the JSObject* we want to protect
nsAutoGCRoot(JSObject** aPtr, nsresult* aResult) :
mPtr(aPtr)
{
mResult = *aResult =
nsContentUtils::AddJSGCRoot(aPtr, "nsAutoGCRoot");
}
// aPtr should be the pointer to the thing we want to protect
nsAutoGCRoot(void* aPtr, nsresult* aResult) :
mPtr(aPtr)
{
mResult = *aResult =
nsContentUtils::AddJSGCRoot(aPtr, "nsAutoGCRoot");
}
~nsAutoGCRoot() {
if (NS_SUCCEEDED(mResult)) {
nsContentUtils::RemoveJSGCRoot(mPtr);
}
}
private:
void* mPtr;
nsresult mResult;
};
#define NS_AUTO_GCROOT_PASTE2(tok,line) tok##line
#define NS_AUTO_GCROOT_PASTE(tok,line) \
NS_AUTO_GCROOT_PASTE2(tok,line)
#define NS_AUTO_GCROOT(ptr, result) \ \
nsAutoGCRoot NS_AUTO_GCROOT_PASTE(_autoGCRoot_, __LINE__) \
(ptr, result)
#define NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(_class) \
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(_class)
#define NS_INTERFACE_MAP_ENTRY_TEAROFF(_interface, _allocator) \
if (aIID.Equals(NS_GET_IID(_interface))) { \
foundInterface = static_cast<_interface *>(_allocator); \
if (!foundInterface) { \
*aInstancePtr = nsnull; \
return NS_ERROR_OUT_OF_MEMORY; \
} \
} else
#endif /* nsContentUtils_h___ */
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