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cd6eb68c1a
gecko/dom/base/nsContentUtils.h
Kyle Huey 0a62d4d460 Bug 1179909: Refactor stable state handling. r=smaug 
This is motivated by three separate but related problems:

1. Our concept of recursion depth is broken for things that run from AfterProcessNextEvent observers (e.g. Promises). We decrement the recursionDepth counter before firing observers, so a Promise callback running at the lowest event loop depth has a recursion depth of 0 (whereas a regular nsIRunnable would be 1). This is a problem because it's impossible to distinguish a Promise running after a sync XHR's onreadystatechange handler from a top-level event (since the former runs with depth 2 - 1 = 1, and the latter runs with just 1).

2. The nsIThreadObserver mechanism that is used by a lot of code to run "after" the current event is a poor fit for anything that runs script. First, the order the observers fire in is the order they were added, not anything fixed by spec. Additionally, running script can cause the event loop to spin, which is a big source of pain here (bholley has some nasty bug caused by this).

3. We run Promises from different points in the code for workers and main thread. The latter runs from XPConnect's nsIThreadObserver callbacks, while the former runs from a hardcoded call to run Promises in the worker event loop. What workers do is particularly problematic because it means we can't get the right recursion depth no matter what we do to nsThread.

The solve this, this patch does the following:

1. Consolidate some handling of microtasks and all handling of stable state from appshell and WorkerPrivate into CycleCollectedJSRuntime.
2. Make the recursionDepth counter only available to CycleCollectedJSRuntime (and its consumers) and remove it from the nsIThreadInternal and nsIThreadObserver APIs.
3. Adjust the recursionDepth counter so that microtasks run with the recursionDepth of the task they are associated with.
4. Introduce the concept of metastable state to replace appshell's RunBeforeNextEvent. Metastable state is reached after every microtask or task is completed. This provides the semantics that bent and I want for IndexedDB, where transactions autocommit at the end of a microtask and do not "spill" from one microtask into a subsequent microtask. This differs from appshell's RunBeforeNextEvent in two ways:
a) It fires between microtasks, which was the motivation for starting this.
b) It no longer ensures that we're at the same event loop depth in the native event queue. bent decided we don't care about this.
5. Reorder stable state to happen after microtasks such as Promises, per HTML. Right now we call the regular thread observers, including appshell, before the main thread observer (XPConnect), so stable state tasks happen before microtasks.
2015-08-11 06:10:46 -07:00

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/* -*- 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/. */
/* A namespace class for static content utilities. */
#ifndef nsContentUtils_h___
#define nsContentUtils_h___
#if defined(XP_WIN)
#include <float.h>
#endif
#if defined(SOLARIS)
#include <ieeefp.h>
#endif
#include "js/TypeDecls.h"
#include "js/Value.h"
#include "js/RootingAPI.h"
#include "mozilla/EventForwards.h"
#include "mozilla/GuardObjects.h"
#include "mozilla/TimeStamp.h"
#include "nsContentListDeclarations.h"
#include "nsMathUtils.h"
#include "nsTArrayForwardDeclare.h"
#include "Units.h"
#include "mozilla/dom/AutocompleteInfoBinding.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "nsIContentPolicy.h"
#if defined(XP_WIN)
// Undefine LoadImage to prevent naming conflict with Windows.
#undef LoadImage
#endif
class imgICache;
class imgIContainer;
class imgINotificationObserver;
class imgIRequest;
class imgLoader;
class imgRequestProxy;
class nsAutoScriptBlockerSuppressNodeRemoved;
class nsHtml5StringParser;
class nsIChannel;
class nsIConsoleService;
class nsIContent;
class nsIContentPolicy;
class nsIContentSecurityPolicy;
class nsIDocShellTreeItem;
class nsIDocument;
class nsIDocumentLoaderFactory;
class nsIDOMDocument;
class nsIDOMDocumentFragment;
class nsIDOMEvent;
class nsIDOMHTMLInputElement;
class nsIDOMKeyEvent;
class nsIDOMNode;
class nsIDOMWindow;
class nsIDragSession;
class nsIEditor;
class nsIFragmentContentSink;
class nsIFrame;
class nsIImageLoadingContent;
class nsIInterfaceRequestor;
class nsIIOService;
class nsILineBreaker;
class nsILoadGroup;
class nsIMessageBroadcaster;
class nsNameSpaceManager;
class nsIObserver;
class nsIParser;
class nsIParserService;
class nsIPresShell;
class nsIPrincipal;
class nsIRequest;
class nsIRunnable;
class nsIScriptContext;
class nsIScriptSecurityManager;
class nsIStringBundle;
class nsIStringBundleService;
class nsISupportsArray;
class nsISupportsHashKey;
class nsIURI;
class nsIUUIDGenerator;
class nsIWidget;
class nsIWordBreaker;
class nsIXPConnect;
class nsNodeInfoManager;
class nsPIDOMWindow;
class nsPresContext;
class nsStringBuffer;
class nsStringHashKey;
class nsTextFragment;
class nsView;
class nsViewportInfo;
class nsWrapperCache;
class nsAttrValue;
class nsITransferable;
class nsPIWindowRoot;
struct JSPropertyDescriptor;
struct JSRuntime;
struct nsIntMargin;
template<class E> class nsCOMArray;
template<class K, class V> class nsDataHashtable;
template<class K, class V> class nsRefPtrHashtable;
template<class T> class nsReadingIterator;
namespace mozilla {
class ErrorResult;
class EventListenerManager;
namespace dom {
class DocumentFragment;
class Element;
class EventTarget;
class IPCDataTransfer;
class NodeInfo;
class nsIContentChild;
class nsIContentParent;
class Selection;
class TabParent;
} // namespace dom
namespace gfx {
class DataSourceSurface;
} // namespace gfx
namespace layers {
class LayerManager;
} // namespace layers
} // namespace mozilla
class nsIBidiKeyboard;
extern const char kLoadAsData[];
// Stolen from nsReadableUtils, but that's OK, since we can declare the same
// name multiple times.
const nsAFlatString& EmptyString();
const nsAFlatCString& EmptyCString();
enum EventNameType {
EventNameType_None = 0x0000,
EventNameType_HTML = 0x0001,
EventNameType_XUL = 0x0002,
EventNameType_SVGGraphic = 0x0004, // svg graphic elements
EventNameType_SVGSVG = 0x0008, // the svg element
EventNameType_SMIL = 0x0010, // smil elements
EventNameType_HTMLBodyOrFramesetOnly = 0x0020,
EventNameType_HTMLXUL = 0x0003,
EventNameType_All = 0xFFFF
};
struct EventNameMapping
{
// This holds pointers to nsGkAtoms members, and is therefore safe as a
// non-owning reference.
nsIAtom* MOZ_NON_OWNING_REF mAtom;
uint32_t mId;
int32_t mType;
mozilla::EventClassID mEventClassID;
};
struct nsShortcutCandidate {
nsShortcutCandidate(uint32_t aCharCode, bool aIgnoreShift) :
mCharCode(aCharCode), mIgnoreShift(aIgnoreShift)
{
}
uint32_t mCharCode;
bool mIgnoreShift;
};
typedef void (*CallOnRemoteChildFunction) (mozilla::dom::TabParent* aTabParent,
void* aArg);
class nsContentUtils
{
friend class nsAutoScriptBlockerSuppressNodeRemoved;
typedef mozilla::dom::Element Element;
typedef mozilla::TimeDuration TimeDuration;
public:
static nsresult Init();
static bool IsCallerChrome();
static bool ThreadsafeIsCallerChrome();
static bool IsCallerContentXBL();
static bool IsImageSrcSetDisabled();
static bool LookupBindingMember(JSContext* aCx, nsIContent *aContent,
JS::Handle<jsid> aId,
JS::MutableHandle<JSPropertyDescriptor> aDesc);
// Check whether we should avoid leaking distinguishing information to JS/CSS.
static bool ShouldResistFingerprinting(nsIDocShell* aDocShell);
/**
* Returns the parent node of aChild crossing document boundaries.
* Uses the parent node in the composed document.
*/
static nsINode* GetCrossDocParentNode(nsINode* aChild);
/**
* 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 true if aPossibleDescendant is a descendant of
* aPossibleAncestor (or is aPossibleAncestor). false
* otherwise.
*/
static bool ContentIsDescendantOf(const nsINode* aPossibleDescendant,
const nsINode* aPossibleAncestor);
/**
* Similar to ContentIsDescendantOf, except will treat an HTMLTemplateElement
* or ShadowRoot as an ancestor of things in the corresponding DocumentFragment.
* See the concept of "host-including inclusive ancestor" in the DOM
* specification.
*/
static bool ContentIsHostIncludingDescendantOf(
const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor);
/**
* Similar to ContentIsDescendantOf except it crosses document boundaries,
* this function uses ancestor/descendant relations in the composed document
* (see shadow DOM spec).
*/
static bool ContentIsCrossDocDescendantOf(nsINode* aPossibleDescendant,
nsINode* aPossibleAncestor);
/*
* This method fills the |aArray| with all ancestor nodes of |aNode|
* including |aNode| at the zero index.
*/
static nsresult GetAncestors(nsINode* aNode,
nsTArray<nsINode*>& 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.
*
* This method just sucks.
*/
static nsresult GetAncestorsAndOffsets(nsIDOMNode* aNode,
int32_t aOffset,
nsTArray<nsIContent*>* aAncestorNodes,
nsTArray<int32_t>* 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);
/**
* Returns true if aNode1 is before aNode2 in the same connected
* tree.
*/
static bool PositionIsBefore(nsINode* aNode1, nsINode* aNode2);
/**
* 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! If the two nodes aren't in the same connected subtree,
* the result is 1, and the optional aDisconnected parameter
* is set to true.
*/
static int32_t ComparePoints(nsINode* aParent1, int32_t aOffset1,
nsINode* aParent2, int32_t aOffset2,
bool* aDisconnected = nullptr);
static int32_t ComparePoints(nsIDOMNode* aParent1, int32_t aOffset1,
nsIDOMNode* aParent2, int32_t aOffset2,
bool* aDisconnected = nullptr);
/**
* 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 Element* MatchElementId(nsIContent *aContent, const nsAString& aId);
/**
* Similar to above, but to be used if one already has an atom for the ID
*/
static Element* MatchElementId(nsIContent *aContent, const nsIAtom* aId);
/**
* Reverses the document position flags passed in.
*
* @param aDocumentPosition The document position flags to be reversed.
*
* @return The reversed document position flags.
*
* @see nsIDOMNode
*/
static uint16_t ReverseDocumentPosition(uint16_t aDocumentPosition);
static uint32_t CopyNewlineNormalizedUnicodeTo(const nsAString& aSource,
uint32_t aSrcOffset,
char16_t* aDest,
uint32_t aLength,
bool& aLastCharCR);
static uint32_t CopyNewlineNormalizedUnicodeTo(nsReadingIterator<char16_t>& aSrcStart, const nsReadingIterator<char16_t>& aSrcEnd, nsAString& aDest);
static const nsDependentSubstring TrimCharsInSet(const char* aSet,
const nsAString& aValue);
template<bool IsWhitespace(char16_t)>
static const nsDependentSubstring TrimWhitespace(const nsAString& aStr,
bool aTrimTrailing = true);
/**
* Returns true if aChar is of class Ps, Pi, Po, Pf, or Pe.
*/
static bool IsFirstLetterPunctuation(uint32_t aChar);
static bool IsFirstLetterPunctuationAt(const nsTextFragment* aFrag, uint32_t aOffset);
/**
* Returns true if aChar is of class Lu, Ll, Lt, Lm, Lo, Nd, Nl or No
*/
static bool IsAlphanumeric(uint32_t aChar);
static bool IsAlphanumericAt(const nsTextFragment* aFrag, uint32_t aOffset);
/*
* Is the character an HTML whitespace character?
*
* We define whitespace using the list in HTML5 and css3-selectors:
* U+0009, U+000A, U+000C, U+000D, U+0020
*
* HTML 4.01 also lists U+200B (zero-width space).
*/
static bool IsHTMLWhitespace(char16_t aChar);
/*
* Returns whether the character is an HTML whitespace (see IsHTMLWhitespace)
* or a nbsp character (U+00A0).
*/
static bool IsHTMLWhitespaceOrNBSP(char16_t aChar);
/**
* Is the HTML local name a block element?
*/
static bool IsHTMLBlock(nsIContent* aContent);
enum ParseHTMLIntegerResultFlags {
eParseHTMLInteger_NoFlags = 0,
eParseHTMLInteger_IsPercent = 1 << 0,
// eParseHTMLInteger_NonStandard is set if the string representation of the
// integer was not the canonical one (e.g. had extra leading '+' or '0').
eParseHTMLInteger_NonStandard = 1 << 1,
eParseHTMLInteger_DidNotConsumeAllInput = 1 << 2,
// Set if one or more error flags were set.
eParseHTMLInteger_Error = 1 << 3,
eParseHTMLInteger_ErrorNoValue = 1 << 4,
eParseHTMLInteger_ErrorOverflow = 1 << 5
};
static int32_t ParseHTMLInteger(const nsAString& aValue,
ParseHTMLIntegerResultFlags *aResult);
/**
* Parse a margin string of format 'top, right, bottom, left' into
* an nsIntMargin.
*
* @param aString the string to parse
* @param aResult the resulting integer
* @return whether the value could be parsed
*/
static bool ParseIntMarginValue(const nsAString& aString, nsIntMargin& aResult);
/**
* Parse the value of the <font size=""> attribute according to the HTML5
* spec as of April 16, 2012.
*
* @param aValue the value to parse
* @return 1 to 7, or 0 if the value couldn't be parsed
*/
static int32_t ParseLegacyFontSize(const nsAString& aValue);
static void Shutdown();
/**
* Checks whether two nodes come from the same origin.
*/
static nsresult CheckSameOrigin(const nsINode* aTrustedNode,
nsIDOMNode* aUnTrustedNode);
static nsresult CheckSameOrigin(const nsINode* aTrustedNode,
const nsINode* unTrustedNode);
// Check if the (JS) caller can access aNode.
static bool CanCallerAccess(nsIDOMNode *aNode);
static bool CanCallerAccess(nsINode* aNode);
// Check if the (JS) caller can access aWindow.
// aWindow can be either outer or inner window.
static bool CanCallerAccess(nsPIDOMWindow* aWindow);
/**
* 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.
*
* @return The document or null if no JS Context.
*/
static nsIDocument* GetDocumentFromCaller();
// Check if a node is in the document prolog, i.e. before the document
// element.
static bool InProlog(nsINode *aNode);
static nsIParserService* GetParserService();
static nsNameSpaceManager* NameSpaceManager()
{
return sNameSpaceManager;
}
static nsIIOService* GetIOService()
{
return sIOService;
}
static nsIBidiKeyboard* GetBidiKeyboard();
/**
* Get the cache security manager service. Can return null if the layout
* module has been shut down.
*/
static nsIScriptSecurityManager* GetSecurityManager()
{
return sSecurityManager;
}
/**
* Get the ContentSecurityPolicy for a JS context.
**/
static bool GetContentSecurityPolicy(nsIContentSecurityPolicy** aCSP);
// Returns the subject principal. Guaranteed to return non-null. May only
// be called when nsContentUtils is initialized.
static nsIPrincipal* SubjectPrincipal();
// Returns the prinipal of the given JS object. This may only be called on
// the main thread for objects from the main thread's JSRuntime.
static nsIPrincipal* ObjectPrincipal(JSObject* aObj);
static nsresult GenerateStateKey(nsIContent* aContent,
const nsIDocument* aDocument,
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 encoding aEncoding) to UTF16 in aOutput.
*
* @param aEncoding the Gecko-canonical name of the encoding or the empty
* string (meaning UTF-8)
*/
static nsresult ConvertStringFromEncoding(const nsACString& aEncoding,
const nsACString& aInput,
nsAString& aOutput);
/**
* Determine whether a buffer begins with a BOM for UTF-8, UTF-16LE,
* UTF-16BE
*
* @param aBuffer the buffer to check
* @param aLength the length of the buffer
* @param aCharset empty if not found
* @return boolean indicating whether a BOM was detected.
*/
static bool CheckForBOM(const unsigned char* aBuffer, uint32_t aLength,
nsACString& aCharset);
/**
* Returns true if |aName| is a valid name to be registered via
* document.registerElement.
*/
static bool IsCustomElementName(nsIAtom* aName);
static nsresult CheckQName(const nsAString& aQualifiedName,
bool aNamespaceAware = true,
const char16_t** aColon = nullptr);
static nsresult SplitQName(const nsIContent* aNamespaceResolver,
const nsAFlatString& aQName,
int32_t *aNamespace, nsIAtom **aLocalName);
static nsresult GetNodeInfoFromQName(const nsAString& aNamespaceURI,
const nsAString& aQualifiedName,
nsNodeInfoManager* aNodeInfoManager,
uint16_t aNodeType,
mozilla::dom::NodeInfo** aNodeInfo);
static void SplitExpatName(const char16_t *aExpatName, nsIAtom **aPrefix,
nsIAtom **aTagName, int32_t *aNameSpaceID);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't ALLOW_ACTION, false is
// returned, otherwise true is returned. Always returns true for the
// system principal, and false for a null principal.
static bool IsSitePermAllow(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't DENY_ACTION, false is
// returned, otherwise true is returned. Always returns false for the
// system principal, and true for a null principal.
static bool IsSitePermDeny(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't ALLOW_ACTION, false is
// returned, otherwise true is returned. Always returns true for the
// system principal, and false for a null principal.
// This version checks the permission for an exact host match on
// the principal
static bool IsExactSitePermAllow(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't DENY_ACTION, false is
// returned, otherwise true is returned. Always returns false for the
// system principal, and true for a null principal.
// This version checks the permission for an exact host match on
// the principal
static bool IsExactSitePermDeny(nsIPrincipal* aPrincipal, const char* aType);
// Returns true if aDoc1 and aDoc2 have equal NodePrincipal()s.
static bool HaveEqualPrincipals(nsIDocument* aDoc1, nsIDocument* aDoc2);
static nsILineBreaker* LineBreaker()
{
return sLineBreaker;
}
static nsIWordBreaker* WordBreaker()
{
return sWordBreaker;
}
/**
* Regster aObserver as a shutdown observer. A strong reference is held
* to aObserver until UnregisterShutdownObserver is called.
*/
static void RegisterShutdownObserver(nsIObserver* aObserver);
static void UnregisterShutdownObserver(nsIObserver* aObserver);
/**
* @return true if aContent has an attribute aName in namespace aNameSpaceID,
* and the attribute value is non-empty.
*/
static bool HasNonEmptyAttr(const nsIContent* aContent, int32_t aNameSpaceID,
nsIAtom* aName);
/**
* Method that gets the primary presContext for the node.
*
* @param aContent The content node.
* @return the presContext, or nullptr if the content is not in a document
* (if GetCurrentDoc returns nullptr)
*/
static nsPresContext* GetContextForContent(const 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 [aContentPolicyType=nsIContentPolicy::TYPE_IMAGE] (Optional)
* The CP content type to use
* @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 true if the load can proceed, or false if it is blocked.
* Note that aImageBlockingStatus, if set will always be an ACCEPT
* status if true is returned and always be a REJECT_* status if
* false is returned.
*/
static bool CanLoadImage(nsIURI* aURI,
nsISupports* aContext,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal,
int16_t* aImageBlockingStatus = nullptr,
uint32_t aContentPolicyType = nsIContentPolicy::TYPE_IMAGE);
/**
* Returns true if objects in aDocument shouldn't initiate image loads.
*/
static bool DocumentInactiveForImageLoads(nsIDocument* aDocument);
/**
* Method to start an image load. This does not do any security checks.
* This method will attempt to make aURI immutable; a caller that wants to
* keep a mutable version around should pass in a clone.
*
* @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 aReferrerPolicy the referrer-sending policy to use on channel
* creation
* @param aObserver the observer for the image load
* @param aLoadFlags the load flags to use. See nsIRequest
* @param [aContentPolicyType=nsIContentPolicy::TYPE_IMAGE] (Optional)
* The CP content type to use
* @return the imgIRequest for the image load
*/
static nsresult LoadImage(nsIURI* aURI,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal,
nsIURI* aReferrer,
mozilla::net::ReferrerPolicy aReferrerPolicy,
imgINotificationObserver* aObserver,
int32_t aLoadFlags,
const nsAString& initiatorType,
imgRequestProxy** aRequest,
uint32_t aContentPolicyType = nsIContentPolicy::TYPE_IMAGE);
/**
* Obtain an image loader that respects the given document/channel's privacy status.
* Null document/channel arguments return the public image loader.
*/
static imgLoader* GetImgLoaderForDocument(nsIDocument* aDoc);
static imgLoader* GetImgLoaderForChannel(nsIChannel* aChannel,
nsIDocument* aContext);
/**
* Returns whether the given URI is in the image cache.
*/
static bool IsImageInCache(nsIURI* aURI, nsIDocument* aDocument);
/**
* Method to get an imgIContainer from an image loading content
*
* @param aContent The image loading content. Must not be null.
* @param aRequest The image request [out]
* @return the imgIContainer corresponding to the first frame of the image
*/
static already_AddRefed<imgIContainer> GetImageFromContent(nsIImageLoadingContent* aContent, imgIRequest **aRequest = nullptr);
/**
* Helper method to call imgIRequest::GetStaticRequest.
*/
static already_AddRefed<imgRequestProxy> GetStaticRequest(imgRequestProxy* aRequest);
/**
* Method that decides whether a content node is draggable
*
* @param aContent The content node to test.
* @return whether it's draggable
*/
static bool ContentIsDraggable(nsIContent* 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 bool 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 bool IsDraggableLink(const nsIContent* aContent);
/**
* Convenience method to create a new nodeinfo that differs only by name
* from aNodeInfo.
*/
static nsresult NameChanged(mozilla::dom::NodeInfo* aNodeInfo, nsIAtom* aName,
mozilla::dom::NodeInfo** 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
* on window takes 5 args.
*/
static void GetEventArgNames(int32_t aNameSpaceID, nsIAtom *aEventName,
bool aIsForWindow,
uint32_t *aArgCount, const char*** aArgNames);
/**
* Returns true if this document is in a Private Browsing window.
*/
static bool IsInPrivateBrowsing(nsIDocument* aDoc);
/**
* Returns true if this loadGroup uses Private Browsing.
*/
static bool IsInPrivateBrowsing(nsILoadGroup* aLoadGroup);
/**
* 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 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 bool IsInSameAnonymousTree(const nsINode* aNode, const nsIContent* aContent);
/**
* Return the nsIXPConnect service.
*/
static nsIXPConnect *XPConnect()
{
return sXPConnect;
}
/**
* Report simple error message to the browser console
* @param aErrorText the error message
* @param classification Name of the module reporting error
*/
static void LogSimpleConsoleError(const nsAString& aErrorText,
const char * classification);
/**
* Report a non-localized error message to the error console.
* @param aErrorText the error message
* @param aErrorFlags See nsIScriptError.
* @param aCategory Name of module reporting error.
* @param aDocument Reference to the document which triggered the message.
* @param [aURI=nullptr] (Optional) URI of resource containing error.
* @param [aSourceLine=EmptyString()] (Optional) The text of the line that
contains the error (may be empty).
* @param [aLineNumber=0] (Optional) Line number within resource
containing error.
* @param [aColumnNumber=0] (Optional) Column number within resource
containing error.
If aURI is null, then aDocument->GetDocumentURI() is used.
*/
static nsresult ReportToConsoleNonLocalized(const nsAString& aErrorText,
uint32_t aErrorFlags,
const nsACString& aCategory,
const nsIDocument* aDocument,
nsIURI* aURI = nullptr,
const nsAFlatString& aSourceLine
= EmptyString(),
uint32_t aLineNumber = 0,
uint32_t aColumnNumber = 0);
/**
* Report a localized error message to the error console.
* @param aErrorFlags See nsIScriptError.
* @param aCategory Name of module reporting error.
* @param aDocument Reference to the document which triggered the message.
* @param aFile Properties file containing localized message.
* @param aMessageName Name of localized message.
* @param [aParams=nullptr] (Optional) Parameters to be substituted into
localized message.
* @param [aParamsLength=0] (Optional) Length of aParams.
* @param [aURI=nullptr] (Optional) URI of resource containing error.
* @param [aSourceLine=EmptyString()] (Optional) The text of the line that
contains the error (may be empty).
* @param [aLineNumber=0] (Optional) Line number within resource
containing error.
* @param [aColumnNumber=0] (Optional) Column number within resource
containing error.
If aURI is null, then aDocument->GetDocumentURI() is used.
*/
enum PropertiesFile {
eCSS_PROPERTIES,
eXBL_PROPERTIES,
eXUL_PROPERTIES,
eLAYOUT_PROPERTIES,
eFORMS_PROPERTIES,
ePRINTING_PROPERTIES,
eDOM_PROPERTIES,
eHTMLPARSER_PROPERTIES,
eSVG_PROPERTIES,
eBRAND_PROPERTIES,
eCOMMON_DIALOG_PROPERTIES,
eMATHML_PROPERTIES,
eSECURITY_PROPERTIES,
eNECKO_PROPERTIES,
PropertiesFile_COUNT
};
static nsresult ReportToConsole(uint32_t aErrorFlags,
const nsACString& aCategory,
const nsIDocument* aDocument,
PropertiesFile aFile,
const char *aMessageName,
const char16_t **aParams = nullptr,
uint32_t aParamsLength = 0,
nsIURI* aURI = nullptr,
const nsAFlatString& aSourceLine
= EmptyString(),
uint32_t aLineNumber = 0,
uint32_t aColumnNumber = 0);
static nsresult
MaybeReportInterceptionErrorToConsole(nsIDocument* aDocument, nsresult aError);
static void LogMessageToConsole(const char* aMsg, ...);
/**
* Get the localized string named |aKey| in properties file |aFile|.
*/
static nsresult GetLocalizedString(PropertiesFile aFile,
const char* aKey,
nsXPIDLString& aResult);
/**
* A helper function that parses a sandbox attribute (of an <iframe> or
* a CSP directive) and converts it to the set of flags used internally.
*
* @param sandboxAttr the sandbox attribute
* @return the set of flags (0 if sandboxAttr is null)
*/
static uint32_t ParseSandboxAttributeToFlags(const nsAttrValue* sandboxAttr);
/**
* Helper function that generates a UUID.
*/
static nsresult GenerateUUIDInPlace(nsID& aUUID);
/**
* Fill (with the parameters given) the localized string named |aKey| in
* properties file |aFile|.
*/
private:
static nsresult FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const char16_t** aParams,
uint32_t aParamsLength,
nsXPIDLString& aResult);
public:
template<uint32_t N>
static nsresult FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const char16_t* (&aParams)[N],
nsXPIDLString& aResult)
{
return FormatLocalizedString(aFile, aKey, aParams, N, aResult);
}
/**
* Returns true if aDocument is a chrome document
*/
static bool IsChromeDoc(nsIDocument *aDocument);
/**
* Returns true if aDocument is in a docshell whose parent is the same type
*/
static bool IsChildOfSameType(nsIDocument* aDoc);
/**
'* Returns true if the content-type will be rendered as plain-text.
*/
static bool IsPlainTextType(const nsACString& aContentType);
/**
* Get the script file name to use when compiling the script
* referenced by aURI. In cases where there's no need for any extra
* security wrapper automation the script file name that's returned
* will be the spec in aURI, else it will be the spec in aDocument's
* URI followed by aURI's spec, separated by " -> ". Returns true
* if the script file name was modified, false if it's aURI's
* spec.
*/
static bool GetWrapperSafeScriptFilename(nsIDocument *aDocument,
nsIURI *aURI,
nsACString& aScriptURI);
/**
* Returns true if aDocument belongs to a chrome docshell for
* display purposes. Returns false for null documents or documents
* which do not belong to a docshell.
*/
static bool IsInChromeDocshell(nsIDocument *aDocument);
/**
* Return the content policy service
*/
static nsIContentPolicy *GetContentPolicy();
/**
* Map internal content policy types to external ones.
*/
static nsContentPolicyType InternalContentPolicyTypeToExternal(nsContentPolicyType aType);
/**
* 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 bool HasMutationListeners(nsINode* aNode,
uint32_t aType,
nsINode* aTargetForSubtreeModified);
/**
* Quick helper to determine whether there are any mutation listeners
* of a given type that apply to any content in this document. It is valid
* to pass null for aDocument here, in which case this function always
* returns true.
*
* @param aDocument The document to search for listeners
* @param aType The type of listener (NS_EVENT_BITS_MUTATION_*)
*
* @return true if there are mutation listeners of the specified type
*/
static bool HasMutationListeners(nsIDocument* aDocument,
uint32_t aType);
/**
* Synchronously fire DOMNodeRemoved on aChild. Only fires the event if
* there really are listeners by checking using the HasMutationListeners
* function above. The function makes sure to hold the relevant objects alive
* for the duration of the event firing. However there are no guarantees
* that any of the objects are alive by the time the function returns.
* If you depend on that you need to hold references yourself.
*
* @param aChild The node to fire DOMNodeRemoved at.
* @param aParent The parent of aChild.
* @param aOwnerDoc The ownerDocument of aChild.
*/
static void MaybeFireNodeRemoved(nsINode* aChild, nsINode* aParent,
nsIDocument* aOwnerDoc);
/**
* This method creates and dispatches a trusted event.
* Works only with events which can be created by calling
* nsIDOMDocument::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,
bool aCanBubble,
bool aCancelable,
bool *aDefaultAction = nullptr);
/**
* This method creates and dispatches a untrusted event.
* Works only with events which can be created by calling
* nsIDOMDocument::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 DispatchUntrustedEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool *aDefaultAction = nullptr);
/**
* This method creates and dispatches a trusted event to the chrome
* event handler (the parent object of the DOM Window in the event target
* chain). Note, chrome event handler is used even if aTarget is a chrome
* object. Use DispatchEventOnlyToChrome if the normal event dispatching is
* wanted in case aTarget is a chrome object.
* Works only with events which can be created by calling
* nsIDOMDocument::CreateEvent() with parameter "Events".
* @param aDocument The document which will be used to create the event,
* and whose window's chrome handler will be used to
* dispatch the event.
* @param aTarget The target of the event, used for event->SetTarget()
* @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 DispatchChromeEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool *aDefaultAction = nullptr);
/**
* This method creates and dispatches a trusted event.
* If aTarget is not a chrome object, the nearest chrome object in the
* propagation path will be used as the start of the event target chain.
* This method is different than DispatchChromeEvent, which always dispatches
* events to chrome event handler. DispatchEventOnlyToChrome works like
* DispatchTrustedEvent in the case aTarget is a chrome object.
* Works only with events which can be created by calling
* nsIDOMDocument::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 DispatchEventOnlyToChrome(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool *aDefaultAction = nullptr);
/**
* 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 bool IsEventAttributeName(nsIAtom* aName, int32_t 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 uint32_t GetEventId(nsIAtom* aName);
/**
* Return the EventClassID for the event with the given name. The name is the
* event name *without* the 'on' prefix. Returns eBasicEventClass if the event
* is not known to be of any particular event class.
*
* @param aName the event name to look up
*/
static mozilla::EventClassID GetEventClassID(const nsAString& aName);
/**
* Return the event id and atom for the event with the given name.
* The name is the event name *without* the 'on' prefix.
* Returns NS_USER_DEFINED_EVENT on the aEventID if the
* event doesn't match a known event name in the category.
*
* @param aName the event name to look up
* @param aEventClassID only return event id for aEventClassID
*/
static nsIAtom* GetEventIdAndAtom(const nsAString& aName,
mozilla::EventClassID aEventClassID,
uint32_t* aEventID);
/**
* 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, creating it if it does not
* already exist.
*
* @param aNode The node for which to get the eventlistener manager.
*/
static mozilla::EventListenerManager*
GetListenerManagerForNode(nsINode* aNode);
/**
* Get the eventlistener manager for aNode, returning null if it does not
* already exist.
*
* @param aNode The node for which to get the eventlistener manager.
*/
static mozilla::EventListenerManager*
GetExistingListenerManagerForNode(const nsINode* aNode);
static void UnmarkGrayJSListenersInCCGenerationDocuments();
/**
* Remove the eventlistener manager for aNode.
*
* @param aNode The node for which to remove the eventlistener manager.
*/
static void RemoveListenerManager(nsINode *aNode);
static bool 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 bool IsValidNodeName(nsIAtom *aLocalName, nsIAtom *aPrefix,
int32_t aNamespaceID);
/**
* Creates a DocumentFragment from text using a context node to resolve
* namespaces.
*
* Note! In the HTML case with the HTML5 parser enabled, this is only called
* from Range.createContextualFragment() and the implementation here is
* quirky accordingly (html context node behaves like a body context node).
* If you don't want that quirky behavior, don't use this method as-is!
*
* @param aContextNode the node which is used to resolve namespaces
* @param aFragment the string which is parsed to a DocumentFragment
* @param aReturn the resulting fragment
* @param aPreventScriptExecution whether to mark scripts as already started
*/
static nsresult CreateContextualFragment(nsINode* aContextNode,
const nsAString& aFragment,
bool aPreventScriptExecution,
nsIDOMDocumentFragment** aReturn);
static already_AddRefed<mozilla::dom::DocumentFragment>
CreateContextualFragment(nsINode* aContextNode, const nsAString& aFragment,
bool aPreventScriptExecution,
mozilla::ErrorResult& aRv);
/**
* Invoke the fragment parsing algorithm (innerHTML) using the HTML parser.
*
* @param aSourceBuffer the string being set as innerHTML
* @param aTargetNode the target container
* @param aContextLocalName local name of context node
* @param aContextNamespace namespace of context node
* @param aQuirks true to make <table> not close <p>
* @param aPreventScriptExecution true to prevent scripts from executing;
* don't set to false when parsing into a target node that has been
* bound to tree.
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ParseFragmentHTML(const nsAString& aSourceBuffer,
nsIContent* aTargetNode,
nsIAtom* aContextLocalName,
int32_t aContextNamespace,
bool aQuirks,
bool aPreventScriptExecution);
/**
* Invoke the fragment parsing algorithm (innerHTML) using the XML parser.
*
* @param aSourceBuffer the string being set as innerHTML
* @param aTargetNode the target container
* @param aTagStack the namespace mapping context
* @param aPreventExecution whether to mark scripts as already started
* @param aReturn the result fragment
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, a return code from the XML parser.
*/
static nsresult ParseFragmentXML(const nsAString& aSourceBuffer,
nsIDocument* aDocument,
nsTArray<nsString>& aTagStack,
bool aPreventScriptExecution,
nsIDOMDocumentFragment** aReturn);
/**
* Parse a string into a document using the HTML parser.
* Script elements are marked unexecutable.
*
* @param aSourceBuffer the string to parse as an HTML document
* @param aTargetDocument the document object to parse into. Must not have
* child nodes.
* @param aScriptingEnabledForNoscriptParsing whether <noscript> is parsed
* as if scripting was enabled
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ParseDocumentHTML(const nsAString& aSourceBuffer,
nsIDocument* aTargetDocument,
bool aScriptingEnabledForNoscriptParsing);
/**
* Converts HTML source to plain text by parsing the source and using the
* plain text serializer on the resulting tree.
*
* @param aSourceBuffer the string to parse as an HTML document
* @param aResultBuffer the string where the plain text result appears;
* may be the same string as aSourceBuffer
* @param aFlags Flags from nsIDocumentEncoder.
* @param aWrapCol Number of columns after which to line wrap; 0 for no
* auto-wrapping
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ConvertToPlainText(const nsAString& aSourceBuffer,
nsAString& aResultBuffer,
uint32_t aFlags,
uint32_t aWrapCol);
/**
* 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,
bool aTryReuse);
/**
* Get the textual contents of a node. This is a concatenation 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.
* @return false on out of memory errors, true otherwise.
*/
MOZ_WARN_UNUSED_RESULT
static bool GetNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult, const mozilla::fallible_t&);
static void GetNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult);
/**
* Same as GetNodeTextContents but appends the result rather than sets it.
*/
static bool AppendNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult, const mozilla::fallible_t&);
/**
* Utility method that checks if a given node has any non-empty children. This
* method does not descend recursively into children by default.
*
* @param aDiscoverMode Set to eRecurseIntoChildren to descend recursively
* into children.
*/
enum TextContentDiscoverMode : uint8_t {
eRecurseIntoChildren, eDontRecurseIntoChildren
};
static bool HasNonEmptyTextContent(
nsINode* aNode,
TextContentDiscoverMode aDiscoverMode = eDontRecurseIntoChildren);
/**
* Delete strings allocated for nsContentList matches
*/
static void DestroyMatchString(void* aData);
/**
* Unbinds the content from the tree and nulls it out if it's not null.
*/
static void DestroyAnonymousContent(nsCOMPtr<nsIContent>* aContent);
static void DestroyAnonymousContent(nsCOMPtr<Element>* aElement);
/*
* 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(bool 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,
uint32_t aCheckLoadFlags,
bool aAllowData,
uint32_t aContentPolicyType,
nsISupports* aContext,
const nsAFlatCString& aMimeGuess = EmptyCString(),
nsISupports* aExtra = nullptr);
/**
* Returns true if aPrincipal is the system principal.
*/
static bool IsSystemPrincipal(nsIPrincipal* aPrincipal);
/**
* Returns true if aPrincipal is an nsExpandedPrincipal.
*/
static bool IsExpandedPrincipal(nsIPrincipal* aPrincipal);
/**
* Returns true if aPrincipal is the system or an nsExpandedPrincipal.
*/
static bool IsSystemOrExpandedPrincipal(nsIPrincipal* aPrincipal)
{
return IsSystemPrincipal(aPrincipal) || IsExpandedPrincipal(aPrincipal);
}
/**
* Gets the system principal from the security manager.
*/
static nsIPrincipal* GetSystemPrincipal();
/**
* Gets the null subject principal singleton. This is only useful for
* assertions.
*/
static nsIPrincipal* GetNullSubjectPrincipal() { return sNullSubjectPrincipal; }
/**
* *aResourcePrincipal is a principal describing who may access the contents
* of a resource. The resource can only be consumed by a principal that
* subsumes *aResourcePrincipal. MAKE SURE THAT NOTHING EVER ACTS WITH THE
* AUTHORITY OF *aResourcePrincipal.
* It may be null to indicate that the resource has no data from any origin
* in it yet and anything may access the resource.
* Additional data is being mixed into the resource from aExtraPrincipal
* (which may be null; if null, no data is being mixed in and this function
* will do nothing). Update *aResourcePrincipal to reflect the new data.
* If *aResourcePrincipal subsumes aExtraPrincipal, nothing needs to change,
* otherwise *aResourcePrincipal is replaced with the system principal.
* Returns true if *aResourcePrincipal changed.
*/
static bool CombineResourcePrincipals(nsCOMPtr<nsIPrincipal>* aResourcePrincipal,
nsIPrincipal* aExtraPrincipal);
/**
* 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.
* @param aIsTrusted If false, JS Context will be pushed to stack
* when the link is triggered.
*/
static void TriggerLink(nsIContent *aContent, nsPresContext *aPresContext,
nsIURI *aLinkURI, const nsString& aTargetSpec,
bool aClick, bool aIsUserTriggered,
bool aIsTrusted);
/**
* Get the link location.
*/
static void GetLinkLocation(mozilla::dom::Element* aElement,
nsString& aLocationString);
/**
* Return top-level widget in the parent chain.
*/
static nsIWidget* GetTopLevelWidget(nsIWidget* aWidget);
/**
* Return the localized ellipsis for UI.
*/
static const nsDependentString GetLocalizedEllipsis();
/**
* Get the candidates for accelkeys for aDOMKeyEvent.
*
* @param aDOMKeyEvent [in] the key event for accelkey handling.
* @param aCandidates [out] the candidate shortcut key combination list.
* the first item is most preferred.
*/
static void GetAccelKeyCandidates(nsIDOMKeyEvent* aDOMKeyEvent,
nsTArray<nsShortcutCandidate>& aCandidates);
/**
* Get the candidates for accesskeys for aNativeKeyEvent.
*
* @param aNativeKeyEvent [in] the key event for accesskey handling.
* @param aCandidates [out] the candidate access key list.
* the first item is most preferred.
*/
static void GetAccessKeyCandidates(
mozilla::WidgetKeyboardEvent* aNativeKeyEvent,
nsTArray<uint32_t>& aCandidates);
/**
* Hide any XUL popups associated with aDocument, including any documents
* displayed in child frames. Does nothing if aDocument is null.
*/
static void HidePopupsInDocument(nsIDocument* aDocument);
/**
* Retrieve the current drag session, or null if no drag is currently occuring
*/
static already_AddRefed<nsIDragSession> GetDragSession();
/*
* Initialize and set the dataTransfer field of an WidgetDragEvent.
*/
static nsresult SetDataTransferInEvent(mozilla::WidgetDragEvent* aDragEvent);
// filters the drag and drop action to fit within the effects allowed and
// returns it.
static uint32_t FilterDropEffect(uint32_t aAction, uint32_t aEffectAllowed);
/*
* Return true if the target of a drop event is a content document that is
* an ancestor of the document for the source of the drag.
*/
static bool CheckForSubFrameDrop(nsIDragSession* aDragSession,
mozilla::WidgetDragEvent* aDropEvent);
/**
* Return true if aURI is a local file URI (i.e. file://).
*/
static bool URIIsLocalFile(nsIURI *aURI);
/**
* Given a URI, return set beforeHash to the part before the '#', and
* afterHash to the remainder of the URI, including the '#'.
*/
static nsresult SplitURIAtHash(nsIURI *aURI,
nsACString &aBeforeHash,
nsACString &aAfterHash);
/**
* Get the application manifest URI for this document. The manifest URI
* is specified in the manifest= attribute of the root element of the
* document.
*
* @param aDocument The document that lists the manifest.
* @param aURI The manifest URI.
*/
static void GetOfflineAppManifest(nsIDocument *aDocument, nsIURI **aURI);
/**
* Check whether an application should be allowed to use offline APIs.
*/
static bool OfflineAppAllowed(nsIURI *aURI);
/**
* Check whether an application should be allowed to use offline APIs.
*/
static bool OfflineAppAllowed(nsIPrincipal *aPrincipal);
/**
* If offline-apps.allow_by_default is true, we set offline-app permission
* for the principal and return true. Otherwise false.
*/
static bool MaybeAllowOfflineAppByDefault(nsIPrincipal *aPrincipal, nsIDOMWindow *aWindow);
/**
* Increases the count of blockers preventing scripts from running.
* NOTE: You might want to use nsAutoScriptBlocker rather than calling
* this directly
*/
static void AddScriptBlocker();
/**
* Decreases the count of blockers preventing scripts from running.
* NOTE: You might want to use nsAutoScriptBlocker rather than calling
* this directly
*
* WARNING! Calling this function could synchronously execute scripts.
*/
static void RemoveScriptBlocker();
/**
* Add a runnable that is to be executed as soon as it's safe to execute
* scripts.
* NOTE: If it's currently safe to execute scripts, aRunnable will be run
* synchronously before the function returns.
*
* @param aRunnable The nsIRunnable to run as soon as it's safe to execute
* scripts. Passing null is allowed and results in nothing
* happening. It is also allowed to pass an object that
* has not yet been AddRefed.
* @return false on out of memory, true otherwise.
*/
static bool AddScriptRunner(nsIRunnable* aRunnable);
/**
* Returns true if it's safe to execute content script and false otherwise.
*
* The only known case where this lies is mutation events. They run, and can
* run anything else, when this function returns false, but this is ok.
*/
static bool IsSafeToRunScript() {
return sScriptBlockerCount == 0;
}
/**
* Call this function if !IsSafeToRunScript() and we fail to run the script
* (rather than using AddScriptRunner as we usually do). |aDocument| is
* optional as it is only used for showing the URL in the console.
*/
static void WarnScriptWasIgnored(nsIDocument* aDocument);
/**
* Add a "synchronous section", in the form of an nsIRunnable run once the
* event loop has reached a "stable state". |aRunnable| must not cause any
* queued events to be processed (i.e. must not spin the event loop).
* We've reached a stable state when the currently executing task/event has
* finished, see
* http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#synchronous-section
* In practice this runs aRunnable once the currently executing event
* finishes. If called multiple times per task/event, all the runnables will
* be executed, in the order in which RunInStableState() was called.
*/
static void RunInStableState(already_AddRefed<nsIRunnable> aRunnable);
/* Add a "synchronous section", in the form of an nsIRunnable run once the
* event loop has reached a "metastable state". |aRunnable| must not cause any
* queued events to be processed (i.e. must not spin the event loop).
* We've reached a metastable state when the currently executing task or
* microtask has finished. This is not specced at this time.
* In practice this runs aRunnable once the currently executing task or
* microtask finishes. If called multiple times per microtask, all the
* runnables will be executed, in the order in which RunInMetastableState()
* was called
*/
static void RunInMetastableState(already_AddRefed<nsIRunnable> aRunnable);
/**
* Retrieve information about the viewport as a data structure.
* This will return information in the viewport META data section
* of the document. This can be used in lieu of ProcessViewportInfo(),
* which places the viewport information in the document header instead
* of returning it directly.
*
* @param aDisplayWidth width of the on-screen display area for this
* document, in device pixels.
* @param aDisplayHeight height of the on-screen display area for this
* document, in device pixels.
*
* NOTE: If the site is optimized for mobile (via the doctype), this
* will return viewport information that specifies default information.
*/
static nsViewportInfo GetViewportInfo(nsIDocument* aDocument,
const mozilla::ScreenIntSize& aDisplaySize);
// Call EnterMicroTask when you're entering JS execution.
// Usually the best way to do this is to use nsAutoMicroTask.
static void EnterMicroTask();
static void LeaveMicroTask();
static bool IsInMicroTask();
static uint32_t MicroTaskLevel();
static void SetMicroTaskLevel(uint32_t aLevel);
static void PerformMainThreadMicroTaskCheckpoint();
/* Process viewport META data. This gives us information for the scale
* and zoom of a page on mobile devices. We stick the information in
* the document header and use it later on after rendering.
*
* See Bug #436083
*/
static nsresult ProcessViewportInfo(nsIDocument *aDocument,
const nsAString &viewportInfo);
static nsIScriptContext* GetContextForEventHandlers(nsINode* aNode,
nsresult* aRv);
static JSContext *GetCurrentJSContext();
static JSContext *GetSafeJSContext();
static JSContext *GetCurrentJSContextForThread();
static JSContext *GetDefaultJSContextForThread();
inline static JSContext *RootingCx() { return GetSafeJSContext(); }
inline static JSContext *RootingCxForThread() { return GetDefaultJSContextForThread(); }
/**
* Case insensitive comparison between two strings. However it only ignores
* case for ASCII characters a-z.
*/
static bool EqualsIgnoreASCIICase(const nsAString& aStr1,
const nsAString& aStr2);
/**
* Convert ASCII A-Z to a-z.
* @return NS_OK on success, or NS_ERROR_OUT_OF_MEMORY if making the string
* writable needs to allocate memory and that allocation fails.
*/
static void ASCIIToLower(nsAString& aStr);
static void ASCIIToLower(const nsAString& aSource, nsAString& aDest);
/**
* Convert ASCII a-z to A-Z.
* @return NS_OK on success, or NS_ERROR_OUT_OF_MEMORY if making the string
* writable needs to allocate memory and that allocation fails.
*/
static void ASCIIToUpper(nsAString& aStr);
static void ASCIIToUpper(const nsAString& aSource, nsAString& aDest);
/**
* Return whether aStr contains an ASCII uppercase character.
*/
static bool StringContainsASCIIUpper(const nsAString& aStr);
// Returns NS_OK for same origin, error (NS_ERROR_DOM_BAD_URI) if not.
static nsresult CheckSameOrigin(nsIChannel *aOldChannel, nsIChannel *aNewChannel);
static nsIInterfaceRequestor* SameOriginChecker();
/**
* Get the Origin of the passed in nsIPrincipal or nsIURI. If the passed in
* nsIURI or the URI of the passed in nsIPrincipal does not have a host, the
* origin is set to 'null'.
*
* The ASCII versions return a ASCII strings that are puny-code encoded,
* suitable for, for example, header values. The UTF versions return strings
* containing international characters.
*
* @pre aPrincipal/aOrigin must not be null.
*
* @note this should be used for HTML5 origin determination.
*/
static nsresult GetASCIIOrigin(nsIPrincipal* aPrincipal,
nsACString& aOrigin);
static nsresult GetASCIIOrigin(nsIURI* aURI, nsACString& aOrigin);
static nsresult GetUTFOrigin(nsIPrincipal* aPrincipal,
nsAString& aOrigin);
static nsresult GetUTFOrigin(nsIURI* aURI, nsAString& aOrigin);
/**
* This method creates and dispatches "command" event, which implements
* nsIDOMXULCommandEvent.
* If aShell is not null, dispatching goes via
* nsIPresShell::HandleDOMEventWithTarget.
*/
static nsresult DispatchXULCommand(nsIContent* aTarget,
bool aTrusted,
nsIDOMEvent* aSourceEvent = nullptr,
nsIPresShell* aShell = nullptr,
bool aCtrl = false,
bool aAlt = false,
bool aShift = false,
bool aMeta = false);
/**
* Gets the nsIDocument given the script context. Will return nullptr on failure.
*
* @param aScriptContext the script context to get the document for; can be null
*
* @return the document associated with the script context
*/
static nsIDocument*
GetDocumentFromScriptContext(nsIScriptContext* aScriptContext);
static bool CheckMayLoad(nsIPrincipal* aPrincipal, nsIChannel* aChannel, bool aAllowIfInheritsPrincipal);
/**
* The method checks whether the caller can access native anonymous content.
* If there is no JS in the stack or privileged JS is running, this
* method returns true, otherwise false.
*/
static bool CanAccessNativeAnon();
MOZ_WARN_UNUSED_RESULT
static nsresult WrapNative(JSContext *cx, nsISupports *native,
const nsIID* aIID, JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, nullptr, aIID, vp, aAllowWrapping);
}
// Same as the WrapNative above, but use this one if aIID is nsISupports' IID.
MOZ_WARN_UNUSED_RESULT
static nsresult WrapNative(JSContext *cx, nsISupports *native,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, nullptr, nullptr, vp, aAllowWrapping);
}
MOZ_WARN_UNUSED_RESULT
static nsresult WrapNative(JSContext *cx, nsISupports *native,
nsWrapperCache *cache,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, cache, nullptr, vp, aAllowWrapping);
}
/**
* Creates an arraybuffer from a binary string.
*/
static nsresult CreateArrayBuffer(JSContext *aCx, const nsACString& aData,
JSObject** aResult);
static nsresult CreateBlobBuffer(JSContext* aCx,
nsISupports* aParent,
const nsACString& aData,
JS::MutableHandle<JS::Value> aBlob);
static void StripNullChars(const nsAString& aInStr, nsAString& aOutStr);
/**
* Strip all \n, \r and nulls from the given string
* @param aString the string to remove newlines from [in/out]
*/
static void RemoveNewlines(nsString &aString);
/**
* Convert Windows and Mac platform linebreaks to \n.
* @param aString the string to convert the newlines inside [in/out]
*/
static void PlatformToDOMLineBreaks(nsString &aString);
MOZ_WARN_UNUSED_RESULT
static bool PlatformToDOMLineBreaks(nsString &aString,
const mozilla::fallible_t&);
/**
* Populates aResultString with the contents of the string-buffer aBuf, up
* to aBuf's null-terminator. aBuf must not be null. Ownership of the string
* is not transferred.
*/
static void PopulateStringFromStringBuffer(nsStringBuffer* aBuf,
nsAString& aResultString);
static bool IsHandlingKeyBoardEvent()
{
return sIsHandlingKeyBoardEvent;
}
static void SetIsHandlingKeyBoardEvent(bool aHandling)
{
sIsHandlingKeyBoardEvent = aHandling;
}
/**
* Utility method for getElementsByClassName. aRootNode is the node (either
* document or element), which getElementsByClassName was called on.
*/
static already_AddRefed<nsContentList>
GetElementsByClassName(nsINode* aRootNode, const nsAString& aClasses)
{
NS_PRECONDITION(aRootNode, "Must have root node");
return NS_GetFuncStringHTMLCollection(aRootNode, MatchClassNames,
DestroyClassNameArray,
AllocClassMatchingInfo,
aClasses);
}
/**
* Returns a presshell for this document, if there is one. This will be
* aDoc's direct presshell if there is one, otherwise we'll look at all
* ancestor documents to try to find a presshell, so for example this can
* still find a presshell for documents in display:none frames that have
* no presentation. So you have to be careful how you use this presshell ---
* getting generic data like a device context or widget from it is OK, but it
* might not be this document's actual presentation.
*/
static nsIPresShell* FindPresShellForDocument(const nsIDocument* aDoc);
/**
* Returns the widget for this document if there is one. Looks at all ancestor
* documents to try to find a widget, so for example this can still find a
* widget for documents in display:none frames that have no presentation.
*/
static nsIWidget* WidgetForDocument(const nsIDocument* aDoc);
/**
* Returns a layer manager to use for the given document. Basically we
* look up the document hierarchy for the first document which has
* a presentation with an associated widget, and use that widget's
* layer manager.
*
* @param aDoc the document for which to return a layer manager.
* @param aAllowRetaining an outparam that states whether the returned
* layer manager should be used for retained layers
*/
static already_AddRefed<mozilla::layers::LayerManager>
LayerManagerForDocument(const nsIDocument *aDoc, bool *aAllowRetaining = nullptr);
/**
* Returns a layer manager to use for the given document. Basically we
* look up the document hierarchy for the first document which has
* a presentation with an associated widget, and use that widget's
* layer manager. In addition to the normal layer manager lookup this will
* specifically request a persistent layer manager. This means that the layer
* manager is expected to remain the layer manager for the document in the
* forseeable future. This function should be used carefully as it may change
* the document's layer manager.
*
* @param aDoc the document for which to return a layer manager.
* @param aAllowRetaining an outparam that states whether the returned
* layer manager should be used for retained layers
*/
static already_AddRefed<mozilla::layers::LayerManager>
PersistentLayerManagerForDocument(nsIDocument *aDoc, bool *aAllowRetaining = nullptr);
/**
* Determine whether a content node is focused or not,
*
* @param aContent the content node to check
* @return true if the content node is focused, false otherwise.
*/
static bool IsFocusedContent(const nsIContent *aContent);
/**
* Returns true if the DOM full-screen API is enabled.
*/
static bool IsFullScreenApiEnabled();
/**
* Returns true if requests for full-screen are allowed in the current
* context. Requests are only allowed if the user initiated them (like with
* a mouse-click or key press), unless this check has been disabled by
* setting the pref "full-screen-api.allow-trusted-requests-only" to false.
*/
static bool IsRequestFullScreenAllowed();
/**
* Returns true if calling execCommand with 'cut' or 'copy' arguments
* is restricted to chrome code.
*/
static bool IsCutCopyRestricted()
{
return !sIsCutCopyAllowed;
}
/**
* Returns true if calling execCommand with 'cut' or 'copy' arguments is
* allowed in the current context. These are only allowed if the user initiated
* them (like with a mouse-click or key press).
*/
static bool IsCutCopyAllowed();
/*
* Returns true if the performance timing APIs are enabled.
*/
static bool IsPerformanceTimingEnabled()
{
return sIsPerformanceTimingEnabled;
}
/*
* Returns true if user timing API should print to console.
*/
static bool IsUserTimingLoggingEnabled()
{
return sIsUserTimingLoggingEnabled;
}
/*
* Returns true if the performance timing APIs are enabled.
*/
static bool IsResourceTimingEnabled()
{
return sIsResourceTimingEnabled;
}
/*
* Returns true if notification should be sent for peformance timing events.
*/
static bool SendPerformanceTimingNotifications()
{
return sSendPerformanceTimingNotifications;
}
/*
* Returns true if URL setters should percent encode the Hash/Ref segment
* and getters should return the percent decoded value of the segment
*/
static bool EncodeDecodeURLHash()
{
return sEncodeDecodeURLHash;
}
/*
* Returns true if URL getters should percent decode the value of the segment
*/
static bool GettersDecodeURLHash()
{
return sGettersDecodeURLHash && sEncodeDecodeURLHash;
}
/*
* Returns true if the browser should attempt to prevent content scripts
* from collecting distinctive information about the browser that could
* be used to "fingerprint" and track the user across websites.
*/
static bool ResistFingerprinting()
{
return sPrivacyResistFingerprinting;
}
/**
* Returns true if the doc tree branch which contains aDoc contains any
* plugins which we don't control event dispatch for, i.e. do any plugins
* in the same tab as this document receive key events outside of our
* control? This always returns false on MacOSX.
*/
static bool HasPluginWithUncontrolledEventDispatch(nsIDocument* aDoc);
/**
* Fire mutation events for changes caused by parsing directly into a
* context node.
*
* @param aDoc the document of the node
* @param aDest the destination node that got stuff appended to it
* @param aOldChildCount the number of children the node had before parsing
*/
static void FireMutationEventsForDirectParsing(nsIDocument* aDoc,
nsIContent* aDest,
int32_t aOldChildCount);
/**
* Returns true if the content is in a document and contains a plugin
* which we don't control event dispatch for, i.e. do any plugins in this
* doc tree receive key events outside of our control? This always returns
* false on MacOSX.
*/
static bool HasPluginWithUncontrolledEventDispatch(nsIContent* aContent);
/**
* Returns the root document in a document hierarchy. Normally this
* will be the chrome document.
*/
static nsIDocument* GetRootDocument(nsIDocument* aDoc);
/**
* Returns true if aWin and the current pointer lock document
* have common scriptable top window.
*/
static bool IsInPointerLockContext(nsIDOMWindow* aWin);
/**
* Returns the time limit on handling user input before
* EventStateManager::IsHandlingUserInput() stops returning true.
* This enables us to detect long running user-generated event handlers.
*/
static TimeDuration HandlingUserInputTimeout();
static void GetShiftText(nsAString& text);
static void GetControlText(nsAString& text);
static void GetMetaText(nsAString& text);
static void GetOSText(nsAString& text);
static void GetAltText(nsAString& text);
static void GetModifierSeparatorText(nsAString& text);
/**
* Returns if aContent has a tabbable subdocument.
* A sub document isn't tabbable when it's a zombie document.
*
* @param aElement element to test.
*
* @return Whether the subdocument is tabbable.
*/
static bool IsSubDocumentTabbable(nsIContent* aContent);
/**
* Returns if aNode ignores user focus.
*
* @param aNode node to test
*
* @return Whether the node ignores user focus.
*/
static bool IsUserFocusIgnored(nsINode* aNode);
/**
* Returns if aContent has the 'scrollgrab' property.
* aContent may be null (in this case false is returned).
*/
static bool HasScrollgrab(nsIContent* aContent);
/**
* Flushes the layout tree (recursively)
*
* @param aWindow the window the flush should start at
*
*/
static void FlushLayoutForTree(nsIDOMWindow* aWindow);
/**
* Returns true if content with the given principal is allowed to use XUL
* and XBL and false otherwise.
*/
static bool AllowXULXBLForPrincipal(nsIPrincipal* aPrincipal);
/**
* Perform cleanup that's appropriate for XPCOM shutdown.
*/
static void XPCOMShutdown();
/**
* Checks if internal PDF viewer is enabled.
*/
static bool IsPDFJSEnabled();
enum ContentViewerType
{
TYPE_UNSUPPORTED,
TYPE_CONTENT,
TYPE_PLUGIN,
TYPE_UNKNOWN
};
static already_AddRefed<nsIDocumentLoaderFactory>
FindInternalContentViewer(const nsACString& aType,
ContentViewerType* aLoaderType = nullptr);
/**
* This helper method returns true if the aPattern pattern matches aValue.
* aPattern should not contain leading and trailing slashes (/).
* The pattern has to match the entire value not just a subset.
* aDocument must be a valid pointer (not null).
*
* This is following the HTML5 specification:
* http://dev.w3.org/html5/spec/forms.html#attr-input-pattern
*
* WARNING: This method mutates aPattern and aValue!
*
* @param aValue the string to check.
* @param aPattern the string defining the pattern.
* @param aDocument the owner document of the element.
* @result whether the given string is matches the pattern.
*/
static bool IsPatternMatching(nsAString& aValue, nsAString& aPattern,
nsIDocument* aDocument);
/**
* Calling this adds support for
* ontouch* event handler DOM attributes.
*/
static void InitializeTouchEventTable();
/**
* Test whether the given URI always inherits a security context
* from the document it comes from.
*/
static nsresult URIInheritsSecurityContext(nsIURI *aURI, bool *aResult);
/**
* Called before a channel is created to query whether the new
* channel should inherit the principal.
*
* The argument aLoadingPrincipal must not be null. The argument
* aURI must be the URI of the new channel. If aInheritForAboutBlank
* is true, then about:blank will be told to inherit the principal.
* If aForceInherit is true, the new channel will be told to inherit
* the principal no matter what.
*
* The return value is whether the new channel should inherit
* the principal.
*/
static bool ChannelShouldInheritPrincipal(nsIPrincipal* aLoadingPrincipal,
nsIURI* aURI,
bool aInheritForAboutBlank,
bool aForceInherit);
static nsresult Btoa(const nsAString& aBinaryData,
nsAString& aAsciiBase64String);
static nsresult Atob(const nsAString& aAsciiString,
nsAString& aBinaryData);
/**
* Returns whether the input element passed in parameter has the autocomplete
* functionality enabled. It is taking into account the form owner.
* NOTE: the caller has to make sure autocomplete makes sense for the
* element's type.
*
* @param aInput the input element to check. NOTE: aInput can't be null.
* @return whether the input element has autocomplete enabled.
*/
static bool IsAutocompleteEnabled(nsIDOMHTMLInputElement* aInput);
enum AutocompleteAttrState : uint8_t
{
eAutocompleteAttrState_Unknown = 1,
eAutocompleteAttrState_Invalid,
eAutocompleteAttrState_Valid,
};
/**
* Parses the value of the autocomplete attribute into aResult, ensuring it's
* composed of valid tokens, otherwise the value "" is used.
* Note that this method is used for form fields, not on a <form> itself.
*
* @return whether aAttr was valid and can be cached.
*/
static AutocompleteAttrState
SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
nsAString& aResult,
AutocompleteAttrState aCachedState =
eAutocompleteAttrState_Unknown);
/* Variation that is used to retrieve a dictionary of the parts of the
* autocomplete attribute.
*
* @return whether aAttr was valid and can be cached.
*/
static AutocompleteAttrState
SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
mozilla::dom::AutocompleteInfo& aInfo,
AutocompleteAttrState aCachedState =
eAutocompleteAttrState_Unknown);
/**
* This will parse aSource, to extract the value of the pseudo attribute
* with the name specified in aName. See
* http://www.w3.org/TR/xml-stylesheet/#NT-StyleSheetPI for the specification
* which is used to parse aSource.
*
* @param aSource the string to parse
* @param aName the name of the attribute to get the value for
* @param aValue [out] the value for the attribute with name specified in
* aAttribute. Empty if the attribute isn't present.
* @return true if the attribute exists and was successfully parsed.
* false if the attribute doesn't exist, or has a malformed
* value, such as an unknown or unterminated entity.
*/
static bool GetPseudoAttributeValue(const nsString& aSource, nsIAtom *aName,
nsAString& aValue);
/**
* Returns true if the language name is a version of JavaScript and
* false otherwise
*/
static bool IsJavaScriptLanguage(const nsString& aName);
/**
* Returns the JSVersion for a string of the form '1.n', n = 0, ..., 8, and
* JSVERSION_UNKNOWN for other strings.
*/
static JSVersion ParseJavascriptVersion(const nsAString& aVersionStr);
static bool IsJavascriptMIMEType(const nsAString& aMIMEType);
static void SplitMimeType(const nsAString& aValue, nsString& aType,
nsString& aParams);
/**
* Function checks if the user is idle.
*
* @param aRequestedIdleTimeInMS The idle observer's requested idle time.
* @param aUserIsIdle boolean indicating if the user
* is currently idle or not. *
* @return NS_OK NS_OK returned if the requested idle service and
* the current idle time were successfully obtained.
* NS_ERROR_FAILURE returned if the the requested
* idle service or the current idle were not obtained.
*/
static nsresult IsUserIdle(uint32_t aRequestedIdleTimeInMS, bool* aUserIsIdle);
/**
* Takes a selection, and a text control element (<input> or <textarea>), and
* returns the offsets in the text content corresponding to the selection.
* The selection's anchor and focus must both be in the root node passed or a
* descendant.
*
* @param aSelection Selection to check
* @param aRoot Root <input> or <textarea> element
* @param aOutStartOffset Output start offset
* @param aOutEndOffset Output end offset
*/
static void GetSelectionInTextControl(mozilla::dom::Selection* aSelection,
Element* aRoot,
int32_t& aOutStartOffset,
int32_t& aOutEndOffset);
/**
* Takes a selection, and return selection's bounding rect which is relative
* to root frame.
*
* @param aSel Selection to check
*/
static nsRect GetSelectionBoundingRect(mozilla::dom::Selection* aSel);
/**
* Takes a frame for anonymous content within a text control (<input> or
* <textarea>), and returns an offset in the text content, adjusted for a
* trailing <br> frame.
*
* @param aOffsetFrame Frame for the text content in which the offset
* lies
* @param aOffset Offset as calculated by GetContentOffsetsFromPoint
* @param aOutOffset Output adjusted offset
*
* @see GetSelectionInTextControl for the original basis of this function.
*/
static int32_t GetAdjustedOffsetInTextControl(nsIFrame* aOffsetFrame,
int32_t aOffset);
static nsIEditor* GetHTMLEditor(nsPresContext* aPresContext);
/**
* Check whether a spec feature/version is supported.
* @param aObject the object, which should support the feature,
* for example nsIDOMNode or nsIDOMDOMImplementation
* @param aFeature the feature ("Views", "Core", "HTML", "Range" ...)
* @param aVersion the version ("1.0", "2.0", ...)
* @return whether the feature is supported or not
*/
static bool InternalIsSupported(nsISupports* aObject,
const nsAString& aFeature,
const nsAString& aVersion);
/**
* Return true if the browser.dom.window.dump.enabled pref is set.
*/
static bool DOMWindowDumpEnabled();
/**
* Returns whether a content is an insertion point for XBL
* bindings or web components ShadowRoot. In web components,
* this corresponds to a <content> element that participates
* in node distribution. In XBL this corresponds to an
* <xbl:children> element in anonymous content.
*
* @param aContent The content to test for being an insertion point.
*/
static bool IsContentInsertionPoint(const nsIContent* aContent);
/**
* Returns whether the children of the provided content are
* nodes that are distributed to Shadow DOM insertion points.
*/
static bool HasDistributedChildren(nsIContent* aContent);
/**
* Returns whether a given header is forbidden for an XHR or fetch
* request.
*/
static bool IsForbiddenRequestHeader(const nsACString& aHeader);
/**
* Returns whether a given header is forbidden for a system XHR
* request.
*/
static bool IsForbiddenSystemRequestHeader(const nsACString& aHeader);
/**
* Returns whether a given Content-Type header value is allowed
* for a non-CORS XHR or fetch request.
*/
static bool IsAllowedNonCorsContentType(const nsACString& aHeaderValue);
/**
* Returns whether a given header is forbidden for an XHR or fetch
* response.
*/
static bool IsForbiddenResponseHeader(const nsACString& aHeader);
/**
* Returns the inner window ID for the window associated with a request,
*/
static uint64_t GetInnerWindowID(nsIRequest* aRequest);
/**
* If the hostname for aURI is an IPv6 it encloses it in brackets,
* otherwise it just outputs the hostname in aHost.
*/
static void GetHostOrIPv6WithBrackets(nsIURI* aURI, nsAString& aHost);
static void GetHostOrIPv6WithBrackets(nsIURI* aURI, nsCString& aHost);
/*
* Call the given callback on all remote children of the given top-level
* window.
*/
static void CallOnAllRemoteChildren(nsIDOMWindow* aWindow,
CallOnRemoteChildFunction aCallback,
void* aArg);
static void TransferablesToIPCTransferables(nsISupportsArray* aTransferables,
nsTArray<mozilla::dom::IPCDataTransfer>& aIPC,
mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent);
static void TransferableToIPCTransferable(nsITransferable* aTransferable,
mozilla::dom::IPCDataTransfer* aIPCDataTransfer,
mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent);
/*
* Get the pixel data from the given source surface and return it as a buffer.
* The length and stride will be assigned from the surface.
*/
static mozilla::UniquePtr<char[]> GetSurfaceData(mozilla::gfx::DataSourceSurface* aSurface,
size_t* aLength, int32_t* aStride);
// Helpers shared by the implementations of nsContentUtils methods and
// nsIDOMWindowUtils methods.
static mozilla::Modifiers GetWidgetModifiers(int32_t aModifiers);
static nsIWidget* GetWidget(nsIPresShell* aPresShell, nsPoint* aOffset);
static int16_t GetButtonsFlagForButton(int32_t aButton);
static mozilla::LayoutDeviceIntPoint ToWidgetPoint(const mozilla::CSSPoint& aPoint,
const nsPoint& aOffset,
nsPresContext* aPresContext);
static nsView* GetViewToDispatchEvent(nsPresContext* aPresContext,
nsIPresShell** aPresShell);
/**
* Synthesize a key event to the given widget
* (see nsIDOMWindowUtils.sendKeyEvent).
*/
static nsresult SendKeyEvent(nsIWidget* aWidget,
const nsAString& aType,
int32_t aKeyCode,
int32_t aCharCode,
int32_t aModifiers,
uint32_t aAdditionalFlags,
bool* aDefaultActionTaken);
/**
* Synthesize a mouse event to the given widget
* (see nsIDOMWindowUtils.sendMouseEvent).
*/
static nsresult SendMouseEvent(nsCOMPtr<nsIPresShell> aPresShell,
const nsAString& aType,
float aX,
float aY,
int32_t aButton,
int32_t aClickCount,
int32_t aModifiers,
bool aIgnoreRootScrollFrame,
float aPressure,
unsigned short aInputSourceArg,
bool aToWindow,
bool *aPreventDefault,
bool aIsSynthesized);
static void FirePageShowEvent(nsIDocShellTreeItem* aItem,
mozilla::dom::EventTarget* aChromeEventHandler,
bool aFireIfShowing);
static void FirePageHideEvent(nsIDocShellTreeItem* aItem,
mozilla::dom::EventTarget* aChromeEventHandler);
static already_AddRefed<nsPIWindowRoot> GetWindowRoot(nsIDocument* aDoc);
/*
* Implements step 3.1 and 3.3 of the Determine request's Referrer algorithm
* from the Referrer Policy specification.
*
* The referrer policy of the document is applied by Necko when using
* channels.
*
* For documents representing an iframe srcdoc attribute, the document sets
* its own URI correctly, so this method simply uses the document's original
* or current URI as appropriate.
*
* aDoc may be null.
*
* https://w3c.github.io/webappsec/specs/referrer-policy/#determine-requests-referrer
*/
static nsresult SetFetchReferrerURIWithPolicy(nsIPrincipal* aPrincipal,
nsIDocument* aDoc,
nsIHttpChannel* aChannel);
static bool PushEnabled(JSContext* aCx, JSObject* aObj);
private:
static bool InitializeEventTable();
static nsresult EnsureStringBundle(PropertiesFile aFile);
static bool CanCallerAccess(nsIPrincipal* aSubjectPrincipal,
nsIPrincipal* aPrincipal);
static nsresult WrapNative(JSContext *cx, nsISupports *native,
nsWrapperCache *cache, const nsIID* aIID,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping);
static nsresult DispatchEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool aTrusted,
bool *aDefaultAction = nullptr,
bool aOnlyChromeDispatch = false);
static void InitializeModifierStrings();
static void DropFragmentParsers();
static bool MatchClassNames(nsIContent* aContent, int32_t aNamespaceID,
nsIAtom* aAtom, void* aData);
static void DestroyClassNameArray(void* aData);
static void* AllocClassMatchingInfo(nsINode* aRootNode,
const nsString* aClasses);
// Fills in aInfo with the tokens from the supplied autocomplete attribute.
static AutocompleteAttrState InternalSerializeAutocompleteAttribute(const nsAttrValue* aAttrVal,
mozilla::dom::AutocompleteInfo& aInfo);
static void CallOnAllRemoteChildren(nsIMessageBroadcaster* aManager,
CallOnRemoteChildFunction aCallback,
void* aArg);
static nsIXPConnect *sXPConnect;
static nsIScriptSecurityManager *sSecurityManager;
static nsIPrincipal *sSystemPrincipal;
static nsIPrincipal *sNullSubjectPrincipal;
static nsIParserService *sParserService;
static nsNameSpaceManager *sNameSpaceManager;
static nsIIOService *sIOService;
static nsIUUIDGenerator *sUUIDGenerator;
static bool sImgLoaderInitialized;
static void InitImgLoader();
// The following four members are initialized lazily
static imgLoader* sImgLoader;
static imgLoader* sPrivateImgLoader;
static imgICache* sImgCache;
static imgICache* sPrivateImgCache;
static nsIConsoleService* sConsoleService;
static nsDataHashtable<nsISupportsHashKey, EventNameMapping>* sAtomEventTable;
static nsDataHashtable<nsStringHashKey, EventNameMapping>* sStringEventTable;
static nsCOMArray<nsIAtom>* sUserDefinedEvents;
static nsIStringBundleService* sStringBundleService;
static nsIStringBundle* sStringBundles[PropertiesFile_COUNT];
static nsIContentPolicy* sContentPolicyService;
static bool sTriedToGetContentPolicy;
static nsILineBreaker* sLineBreaker;
static nsIWordBreaker* sWordBreaker;
static nsIBidiKeyboard* sBidiKeyboard;
static bool sInitialized;
static uint32_t sScriptBlockerCount;
static uint32_t sDOMNodeRemovedSuppressCount;
static uint32_t sMicroTaskLevel;
// Not an nsCOMArray because removing elements from those is slower
static nsTArray< nsCOMPtr<nsIRunnable> >* sBlockedScriptRunners;
static uint32_t sRunnersCountAtFirstBlocker;
static uint32_t sScriptBlockerCountWhereRunnersPrevented;
static nsIInterfaceRequestor* sSameOriginChecker;
static bool sIsHandlingKeyBoardEvent;
static bool sAllowXULXBL_for_file;
static bool sIsFullScreenApiEnabled;
static bool sTrustedFullScreenOnly;
static bool sIsCutCopyAllowed;
static uint32_t sHandlingInputTimeout;
static bool sIsPerformanceTimingEnabled;
static bool sIsResourceTimingEnabled;
static bool sIsUserTimingLoggingEnabled;
static bool sIsExperimentalAutocompleteEnabled;
static bool sEncodeDecodeURLHash;
static bool sGettersDecodeURLHash;
static bool sPrivacyResistFingerprinting;
static bool sSendPerformanceTimingNotifications;
static nsHtml5StringParser* sHTMLFragmentParser;
static nsIParser* sXMLFragmentParser;
static nsIFragmentContentSink* sXMLFragmentSink;
/**
* True if there's a fragment parser activation on the stack.
*/
static bool sFragmentParsingActive;
static nsString* sShiftText;
static nsString* sControlText;
static nsString* sMetaText;
static nsString* sOSText;
static nsString* sAltText;
static nsString* sModifierSeparator;
#if !(defined(DEBUG) || defined(MOZ_ENABLE_JS_DUMP))
static bool sDOMWindowDumpEnabled;
#endif
};
class MOZ_STACK_CLASS nsAutoScriptBlocker {
public:
explicit nsAutoScriptBlocker(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM) {
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
nsContentUtils::AddScriptBlocker();
}
~nsAutoScriptBlocker() {
nsContentUtils::RemoveScriptBlocker();
}
private:
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class MOZ_STACK_CLASS nsAutoScriptBlockerSuppressNodeRemoved :
public nsAutoScriptBlocker {
public:
nsAutoScriptBlockerSuppressNodeRemoved() {
++nsContentUtils::sDOMNodeRemovedSuppressCount;
}
~nsAutoScriptBlockerSuppressNodeRemoved() {
--nsContentUtils::sDOMNodeRemovedSuppressCount;
}
};
class MOZ_STACK_CLASS nsAutoMicroTask
{
public:
nsAutoMicroTask()
{
nsContentUtils::EnterMicroTask();
}
~nsAutoMicroTask()
{
nsContentUtils::LeaveMicroTask();
}
};
namespace mozilla {
namespace dom {
class TreeOrderComparator {
public:
bool Equals(nsINode* aElem1, nsINode* aElem2) const {
return aElem1 == aElem2;
}
bool LessThan(nsINode* aElem1, nsINode* aElem2) const {
return nsContentUtils::PositionIsBefore(aElem1, aElem2);
}
};
} // namespace dom
} // namespace mozilla
#define NS_INTERFACE_MAP_ENTRY_TEAROFF(_interface, _allocator) \
if (aIID.Equals(NS_GET_IID(_interface))) { \
foundInterface = static_cast<_interface *>(_allocator); \
if (!foundInterface) { \
*aInstancePtr = nullptr; \
return NS_ERROR_OUT_OF_MEMORY; \
} \
} else
/*
* In the following helper macros we exploit the fact that the result of a
* series of additions will not be finite if any one of the operands in the
* series is not finite.
*/
#define NS_ENSURE_FINITE(f, rv) \
if (!mozilla::IsFinite(f)) { \
return (rv); \
}
#define NS_ENSURE_FINITE2(f1, f2, rv) \
if (!mozilla::IsFinite((f1)+(f2))) { \
return (rv); \
}
#define NS_ENSURE_FINITE4(f1, f2, f3, f4, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4))) { \
return (rv); \
}
#define NS_ENSURE_FINITE5(f1, f2, f3, f4, f5, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4)+(f5))) { \
return (rv); \
}
#define NS_ENSURE_FINITE6(f1, f2, f3, f4, f5, f6, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4)+(f5)+(f6))) { \
return (rv); \
}
// Deletes a linked list iteratively to avoid blowing up the stack (bug 460444).
#define NS_CONTENT_DELETE_LIST_MEMBER(type_, ptr_, member_) \
{ \
type_ *cur = (ptr_)->member_; \
(ptr_)->member_ = nullptr; \
while (cur) { \
type_ *next = cur->member_; \
cur->member_ = nullptr; \
delete cur; \
cur = next; \
} \
}
#endif /* nsContentUtils_h___ */
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