/* -*- 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/. */ /* * Implementation of the DOM Range object. */ #ifndef nsRange_h___ #define nsRange_h___ #include "nsCOMPtr.h" #include "nsINode.h" #include "mozilla/dom/Document.h" #include "nsLayoutUtils.h" #include "prmon.h" #include "nsStubMutationObserver.h" #include "nsWrapperCache.h" #include "mozilla/Attributes.h" #include "mozilla/GuardObjects.h" #include "mozilla/LinkedList.h" #include "mozilla/RangeBoundary.h" namespace mozilla { class ErrorResult; namespace dom { struct ClientRectsAndTexts; class DocGroup; class DocumentFragment; class DOMRect; class DOMRectList; class InspectorFontFace; class Selection; } // namespace dom } // namespace mozilla class nsRange final : public nsStubMutationObserver, public nsWrapperCache, // For linking together selection-associated ranges. public mozilla::LinkedListElement { typedef mozilla::ErrorResult ErrorResult; typedef mozilla::dom::DocGroup DocGroup; typedef mozilla::dom::DOMRect DOMRect; typedef mozilla::dom::DOMRectList DOMRectList; typedef mozilla::RangeBoundary RangeBoundary; typedef mozilla::RawRangeBoundary RawRangeBoundary; virtual ~nsRange(); public: explicit nsRange(nsINode* aNode); static nsresult CreateRange(nsINode* aStartContainer, uint32_t aStartOffset, nsINode* aEndContainer, uint32_t aEndOffset, nsRange** aRange); static nsresult CreateRange(const RawRangeBoundary& aStart, const RawRangeBoundary& aEnd, nsRange** aRange); NS_DECL_CYCLE_COLLECTING_ISUPPORTS NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsRange) nsrefcnt GetRefCount() const { return mRefCnt; } nsINode* GetRoot() const { return mRoot; } const RangeBoundary& StartRef() const { return mStart; } nsINode* GetStartContainer() const { return mStart.Container(); } const RangeBoundary& EndRef() const { return mEnd; } nsINode* GetEndContainer() const { return mEnd.Container(); } uint32_t StartOffset() const { return static_cast(mStart.Offset()); } uint32_t EndOffset() const { return static_cast(mEnd.Offset()); } nsIContent* GetChildAtStartOffset() const { return mStart.GetChildAtOffset(); } nsIContent* GetChildAtEndOffset() const { return mEnd.GetChildAtOffset(); } bool IsPositioned() const { return mIsPositioned; } /** * Return true iff this range is part of a Selection object * and isn't detached. */ bool IsInSelection() const { return !!mSelection; } /** * Called when the range is added/removed from a Selection. */ void SetSelection(mozilla::dom::Selection* aSelection); /** * Returns pointer to a Selection if the range is associated with a Selection. */ mozilla::dom::Selection* GetSelection() const { return mSelection; } /** * Return true if this range was generated. * @see SetIsGenerated */ bool IsGenerated() const { return mIsGenerated; } /** * Mark this range as being generated or not. * Currently it is used for marking ranges that are created when splitting up * a range to exclude a -moz-user-select:none region. * @see Selection::AddItem * @see ExcludeNonSelectableNodes */ void SetIsGenerated(bool aIsGenerated) { mIsGenerated = aIsGenerated; } nsINode* GetCommonAncestor() const; void Reset(); /** * ResetTemporarily() is called when Selection starts to cache the instance * to reuse later. This method clears mStart, mEnd and mIsPositioned but * does not clear mRoot for reducing the cost to register this as a mutation * observer again. */ void ResetTemporarily() { DoSetRange(RawRangeBoundary(), RawRangeBoundary(), mRoot); } /** * SetStart() and SetEnd() sets start point or end point separately. * However, this is expensive especially when it's a range of Selection. * When you set both start and end of a range, you should use * SetStartAndEnd() instead. */ nsresult SetStart(nsINode* aContainer, uint32_t aOffset) { ErrorResult error; SetStart(RawRangeBoundary(aContainer, aOffset), error); return error.StealNSResult(); } nsresult SetEnd(nsINode* aContainer, uint32_t aOffset) { ErrorResult error; SetEnd(RawRangeBoundary(aContainer, aOffset), error); return error.StealNSResult(); } already_AddRefed CloneRange() const; /** * SetStartAndEnd() works similar to call both SetStart() and SetEnd(). * Different from calls them separately, this does nothing if either * the start point or the end point is invalid point. * If the specified start point is after the end point, the range will be * collapsed at the end point. Similarly, if they are in different root, * the range will be collapsed at the end point. */ nsresult SetStartAndEnd(nsINode* aStartContainer, uint32_t aStartOffset, nsINode* aEndContainer, uint32_t aEndOffset) { return SetStartAndEnd(RawRangeBoundary(aStartContainer, aStartOffset), RawRangeBoundary(aEndContainer, aEndOffset)); } nsresult SetStartAndEnd(const RawRangeBoundary& aStart, const RawRangeBoundary& aEnd); /** * Adds all nodes between |aStartContent| and |aEndContent| to the range. * The start offset will be set before |aStartContent|, * while the end offset will be set immediately after |aEndContent|. * * Caller must guarantee both nodes are non null and * children of |aContainer| and that |aEndContent| is after |aStartContent|. */ void SelectNodesInContainer(nsINode* aContainer, nsIContent* aStartContent, nsIContent* aEndContent); /** * CollapseTo() works similar to call both SetStart() and SetEnd() with * same node and offset. This just calls SetStartAndParent() to set * collapsed range at aContainer and aOffset. */ nsresult CollapseTo(nsINode* aContainer, uint32_t aOffset) { return CollapseTo(RawRangeBoundary(aContainer, aOffset)); } nsresult CollapseTo(const RawRangeBoundary& aPoint) { return SetStartAndEnd(aPoint, aPoint); } /** * Retrieves node and offset for setting start or end of a range to * before or after aNode. */ static nsINode* GetContainerAndOffsetAfter(nsINode* aNode, uint32_t* aOffset) { MOZ_ASSERT(aNode); MOZ_ASSERT(aOffset); *aOffset = 0; nsINode* parentNode = aNode->GetParentNode(); if (!parentNode) { return nullptr; } int32_t indexInParent = parentNode->ComputeIndexOf(aNode); if (NS_WARN_IF(indexInParent < 0)) { return nullptr; } *aOffset = static_cast(indexInParent) + 1; return parentNode; } static nsINode* GetContainerAndOffsetBefore(nsINode* aNode, uint32_t* aOffset) { MOZ_ASSERT(aNode); MOZ_ASSERT(aOffset); *aOffset = 0; nsINode* parentNode = aNode->GetParentNode(); if (!parentNode) { return nullptr; } int32_t indexInParent = parentNode->ComputeIndexOf(aNode); if (NS_WARN_IF(indexInParent < 0)) { return nullptr; } *aOffset = static_cast(indexInParent); return parentNode; } // aMaxRanges is the maximum number of text ranges to record for each face // (pass 0 to just get the list of faces, without recording exact ranges // where each face was used). nsresult GetUsedFontFaces( nsTArray>& aResult, uint32_t aMaxRanges, bool aSkipCollapsedWhitespace); // nsIMutationObserver methods NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED // WebIDL static already_AddRefed Constructor( const mozilla::dom::GlobalObject& global, mozilla::ErrorResult& aRv); bool Collapsed() const { return mIsPositioned && mStart.Container() == mEnd.Container() && mStart.Offset() == mEnd.Offset(); } already_AddRefed CreateContextualFragment( const nsAString& aString, ErrorResult& aError); already_AddRefed CloneContents( ErrorResult& aErr); int16_t CompareBoundaryPoints(uint16_t aHow, nsRange& aOther, ErrorResult& aErr); int16_t ComparePoint(nsINode& aContainer, uint32_t aOffset, ErrorResult& aErr) { return ComparePoint(RawRangeBoundary(&aContainer, aOffset), aErr); } int16_t ComparePoint(const RawRangeBoundary& aPoint, ErrorResult& aErr); void DeleteContents(ErrorResult& aRv); already_AddRefed ExtractContents( ErrorResult& aErr); nsINode* GetCommonAncestorContainer(ErrorResult& aRv) const; nsINode* GetStartContainer(ErrorResult& aRv) const; uint32_t GetStartOffset(ErrorResult& aRv) const; nsINode* GetEndContainer(ErrorResult& aRv) const; uint32_t GetEndOffset(ErrorResult& aRv) const; void InsertNode(nsINode& aNode, ErrorResult& aErr); bool IntersectsNode(nsINode& aNode, ErrorResult& aRv); bool IsPointInRange(nsINode& aContainer, uint32_t aOffset, ErrorResult& aErr) { return IsPointInRange(RawRangeBoundary(&aContainer, aOffset), aErr); } bool IsPointInRange(const RawRangeBoundary& aPoint, ErrorResult& aErr); void ToString(nsAString& aReturn, ErrorResult& aErr); void Detach(); // *JS() methods are mapped to Range.*() of DOM. // They may move focus only when the range represents normal selection. // These methods shouldn't be used from internal. void CollapseJS(bool aToStart); void SelectNodeJS(nsINode& aNode, ErrorResult& aErr); void SelectNodeContentsJS(nsINode& aNode, ErrorResult& aErr); void SetEndJS(nsINode& aNode, uint32_t aOffset, ErrorResult& aErr); void SetEndAfterJS(nsINode& aNode, ErrorResult& aErr); void SetEndBeforeJS(nsINode& aNode, ErrorResult& aErr); void SetStartJS(nsINode& aNode, uint32_t aOffset, ErrorResult& aErr); void SetStartAfterJS(nsINode& aNode, ErrorResult& aErr); void SetStartBeforeJS(nsINode& aNode, ErrorResult& aErr); void SurroundContents(nsINode& aNode, ErrorResult& aErr); already_AddRefed GetBoundingClientRect(bool aClampToEdge = true, bool aFlushLayout = true); already_AddRefed GetClientRects(bool aClampToEdge = true, bool aFlushLayout = true); void GetClientRectsAndTexts(mozilla::dom::ClientRectsAndTexts& aResult, ErrorResult& aErr); // Following methods should be used for internal use instead of *JS(). void SelectNode(nsINode& aNode, ErrorResult& aErr); void SelectNodeContents(nsINode& aNode, ErrorResult& aErr); void SetEnd(nsINode& aNode, uint32_t aOffset, ErrorResult& aErr); void SetEnd(const RawRangeBoundary& aPoint, ErrorResult& aErr); void SetEndAfter(nsINode& aNode, ErrorResult& aErr); void SetEndBefore(nsINode& aNode, ErrorResult& aErr); void SetStart(nsINode& aNode, uint32_t aOffset, ErrorResult& aErr); void SetStart(const RawRangeBoundary& aPoint, ErrorResult& aErr); void SetStartAfter(nsINode& aNode, ErrorResult& aErr); void SetStartBefore(nsINode& aNode, ErrorResult& aErr); void Collapse(bool aToStart); static void GetInnerTextNoFlush(mozilla::dom::DOMString& aValue, mozilla::ErrorResult& aError, nsIContent* aContainer); nsINode* GetParentObject() const { return mOwner; } JSObject* WrapObject(JSContext* cx, JS::Handle aGivenProto) final; DocGroup* GetDocGroup() const; private: // no copy's or assigns nsRange(const nsRange&); nsRange& operator=(const nsRange&); /** * Cut or delete the range's contents. * * @param aFragment DocumentFragment containing the nodes. * May be null to indicate the caller doesn't want a * fragment. */ nsresult CutContents(mozilla::dom::DocumentFragment** frag); static nsresult CloneParentsBetween(nsINode* aAncestor, nsINode* aNode, nsINode** aClosestAncestor, nsINode** aFarthestAncestor); /** * Returns whether a node is safe to be accessed by the current caller. */ bool CanAccess(const nsINode&) const; public: /** * Compute the root node of aNode for initializing range classes. * When aNode is in an anonymous subtree, this returns the shadow root or * binding parent. Otherwise, the root node of the document or document * fragment. If this returns nullptr, that means aNode can be neither the * start container nor end container of any range. */ static nsINode* ComputeRootNode(nsINode* aNode); /** * Return true if aStartContainer/aStartOffset and aEndContainer/aEndOffset * are valid start and end points for a range. Otherwise, return false. */ static bool IsValidPoints(nsINode* aStartContainer, uint32_t aStartOffset, nsINode* aEndContainer, uint32_t aEndOffset); /****************************************************************************** * Utility routine to detect if a content node starts before a range and/or * ends after a range. If neither it is contained inside the range. * * XXX - callers responsibility to ensure node in same doc as range! * *****************************************************************************/ static nsresult CompareNodeToRange(nsINode* aNode, nsRange* aRange, bool* outNodeBefore, bool* outNodeAfter); /** * Return true if any part of (aNode, aStartOffset) .. (aNode, aEndOffset) * overlaps any nsRange in aNode's GetNextRangeCommonAncestor ranges (i.e. * where aNode is a descendant of a range's common ancestor node). * If a nsRange starts in (aNode, aEndOffset) or if it ends in * (aNode, aStartOffset) then it is non-overlapping and the result is false * for that nsRange. Collapsed ranges always counts as non-overlapping. */ static bool IsNodeSelected(nsINode* aNode, uint32_t aStartOffset, uint32_t aEndOffset); /** * This helper function gets rects and correlated text for the given range. * @param aTextList optional where nullptr = don't retrieve text */ static void CollectClientRectsAndText( nsLayoutUtils::RectCallback* aCollector, mozilla::dom::Sequence* aTextList, nsRange* aRange, nsINode* aStartContainer, uint32_t aStartOffset, nsINode* aEndContainer, uint32_t aEndOffset, bool aClampToEdge, bool aFlushLayout); /** * Scan this range for -moz-user-select:none nodes and split it up into * multiple ranges to exclude those nodes. The resulting ranges are put * in aOutRanges. If no -moz-user-select:none node is found in the range * then |this| is unmodified and is the only range in aOutRanges. * Otherwise, |this| will be modified so that it ends before the first * -moz-user-select:none node and additional ranges may also be created. * If all nodes in the range are -moz-user-select:none then aOutRanges * will be empty. * @param aOutRanges the resulting set of ranges */ void ExcludeNonSelectableNodes(nsTArray>* aOutRanges); /** * Notify the selection listeners after a range has been modified. */ MOZ_CAN_RUN_SCRIPT void NotifySelectionListenersAfterRangeSet(); typedef nsTHashtable> RangeHashTable; protected: void RegisterCommonAncestor(nsINode* aNode); void UnregisterCommonAncestor(nsINode* aNode, bool aIsUnlinking); nsINode* IsValidBoundary(nsINode* aNode) const { return ComputeRootNode(aNode); } /** * XXX nsRange should accept 0 - UINT32_MAX as offset. However, users of * nsRange treat offset as int32_t. Additionally, some other internal * APIs like nsINode::ComputeIndexOf() use int32_t. Therefore, * nsRange should accept only 0 - INT32_MAX as valid offset for now. */ static bool IsValidOffset(uint32_t aOffset) { return aOffset <= INT32_MAX; } static bool IsValidOffset(nsINode* aNode, uint32_t aOffset); // CharacterDataChanged set aNotInsertedYet to true to disable an assertion // and suppress re-registering a range common ancestor node since // the new text node of a splitText hasn't been inserted yet. // CharacterDataChanged does the re-registering when needed. MOZ_CAN_RUN_SCRIPT_BOUNDARY void DoSetRange(const RawRangeBoundary& lowerBound, const RawRangeBoundary& upperBound, nsINode* aRoot, bool aNotInsertedYet = false); /** * For a range for which IsInSelection() is true, return the common ancestor * for the range, which we had to compute when the common ancestor changed or * IsInSelection became true, so we could register with it. That is, it's a * faster version of GetCommonAncestor that only works for ranges in a * Selection. The method will assert and the behavior is undefined if called * on a range where IsInSelection() is false. */ nsINode* GetRegisteredCommonAncestor(); // Helper to IsNodeSelected. static bool IsNodeInSortedRanges(nsINode* aNode, uint32_t aStartOffset, uint32_t aEndOffset, const nsTArray& aRanges, size_t aRangeStart, size_t aRangeEnd); // Assume that this is guaranteed that this is held by the caller when // this is used. (Note that we cannot use AutoRestore for mCalledByJS // due to a bit field.) class MOZ_RAII AutoCalledByJSRestore final { private: nsRange& mRange; bool mOldValue; MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER public: explicit AutoCalledByJSRestore( nsRange& aRange MOZ_GUARD_OBJECT_NOTIFIER_PARAM) : mRange(aRange), mOldValue(aRange.mCalledByJS) { MOZ_GUARD_OBJECT_NOTIFIER_INIT; } ~AutoCalledByJSRestore() { mRange.mCalledByJS = mOldValue; } bool SavedValue() const { return mOldValue; } }; struct MOZ_STACK_CLASS AutoInvalidateSelection { explicit AutoInvalidateSelection(nsRange* aRange) : mRange(aRange) { if (!mRange->IsInSelection() || sIsNested) { return; } sIsNested = true; mCommonAncestor = mRange->GetRegisteredCommonAncestor(); } ~AutoInvalidateSelection(); nsRange* mRange; RefPtr mCommonAncestor; static bool sIsNested; }; RefPtr mOwner; nsCOMPtr mRoot; // mRegisteredCommonAncestor is only non-null when the range // IsInSelection(). It's kept alive via mStartContainer/mEndContainer, // because we update it any time those could become disconnected from it. nsINode* MOZ_NON_OWNING_REF mRegisteredCommonAncestor; mozilla::WeakPtr mSelection; // These raw pointers are used to remember a child that is about // to be inserted between a CharacterData call and a subsequent // ContentInserted or ContentAppended call. It is safe to store // these refs because the caller is guaranteed to trigger both // notifications while holding a strong reference to the new child. nsIContent* MOZ_NON_OWNING_REF mNextStartRef; nsIContent* MOZ_NON_OWNING_REF mNextEndRef; RangeBoundary mStart; RangeBoundary mEnd; bool mIsPositioned : 1; bool mIsGenerated : 1; bool mCalledByJS : 1; }; #endif /* nsRange_h___ */