зеркало из https://github.com/mozilla/gecko-dev.git
249 строки
8.5 KiB
C++
249 строки
8.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Base class for DOM Core's Comment, DocumentType, Text,
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* CDATASection, and ProcessingInstruction nodes.
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*/
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#ifndef mozilla_dom_CharacterData_h
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#define mozilla_dom_CharacterData_h
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#include "mozilla/Attributes.h"
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#include "nsIContent.h"
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#include "nsTextFragment.h"
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#include "nsError.h"
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#include "mozilla/dom/Element.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsISMILAttr.h"
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#include "mozilla/dom/ShadowRoot.h"
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class nsIDocument;
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namespace mozilla {
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namespace dom {
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class HTMLSlotElement;
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} // namespace dom
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} // namespace mozilla
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#define CHARACTER_DATA_FLAG_BIT(n_) NODE_FLAG_BIT(NODE_TYPE_SPECIFIC_BITS_OFFSET + (n_))
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// Data node specific flags
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enum {
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// This bit is set to indicate that if the text node changes to
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// non-whitespace, we may need to create a frame for it. This bit must
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// not be set on nodes that already have a frame.
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NS_CREATE_FRAME_IF_NON_WHITESPACE = CHARACTER_DATA_FLAG_BIT(0),
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// This bit is set to indicate that if the text node changes to
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// whitespace, we may need to reframe it (or its ancestors).
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NS_REFRAME_IF_WHITESPACE = CHARACTER_DATA_FLAG_BIT(1),
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// This bit is set to indicate that we have a cached
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// TextIsOnlyWhitespace value
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NS_CACHED_TEXT_IS_ONLY_WHITESPACE = CHARACTER_DATA_FLAG_BIT(2),
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// This bit is only meaningful if the NS_CACHED_TEXT_IS_ONLY_WHITESPACE
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// bit is set, and if so it indicates whether we're only whitespace or
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// not.
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NS_TEXT_IS_ONLY_WHITESPACE = CHARACTER_DATA_FLAG_BIT(3),
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// This bit is set if there is a NewlineProperty attached to the node
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// (used by nsTextFrame).
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NS_HAS_NEWLINE_PROPERTY = CHARACTER_DATA_FLAG_BIT(4),
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// This bit is set if there is a FlowLengthProperty attached to the node
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// (used by nsTextFrame).
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NS_HAS_FLOWLENGTH_PROPERTY = CHARACTER_DATA_FLAG_BIT(5),
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// This bit is set if the node may be modified frequently. This is typically
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// specified if the instance is in <input> or <textarea>.
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NS_MAYBE_MODIFIED_FREQUENTLY = CHARACTER_DATA_FLAG_BIT(6),
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};
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// Make sure we have enough space for those bits
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ASSERT_NODE_FLAGS_SPACE(NODE_TYPE_SPECIFIC_BITS_OFFSET + 7);
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#undef CHARACTER_DATA_FLAG_BIT
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namespace mozilla {
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namespace dom {
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class CharacterData : public nsIContent
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{
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_ADDSIZEOFEXCLUDINGTHIS
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explicit CharacterData(already_AddRefed<dom::NodeInfo>& aNodeInfo);
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explicit CharacterData(already_AddRefed<dom::NodeInfo>&& aNodeInfo);
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void MarkAsMaybeModifiedFrequently()
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{
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SetFlags(NS_MAYBE_MODIFIED_FREQUENTLY);
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}
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NS_IMPL_FROMNODE_HELPER(CharacterData, IsCharacterData())
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virtual void GetNodeValueInternal(nsAString& aNodeValue) override;
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virtual void SetNodeValueInternal(const nsAString& aNodeValue,
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ErrorResult& aError) override;
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// nsINode methods
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virtual uint32_t GetChildCount() const override;
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virtual nsIContent *GetChildAt_Deprecated(uint32_t aIndex) const override;
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virtual int32_t ComputeIndexOf(const nsINode* aPossibleChild) const override;
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virtual nsresult InsertChildBefore(nsIContent* aKid, nsIContent* aBeforeThis,
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bool aNotify) override;
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virtual nsresult InsertChildAt_Deprecated(nsIContent* aKid, uint32_t aIndex,
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bool aNotify) override;
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virtual void RemoveChildAt_Deprecated(uint32_t aIndex, bool aNotify) override;
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virtual void RemoveChildNode(nsIContent* aKid, bool aNotify) override;
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virtual void GetTextContentInternal(nsAString& aTextContent,
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OOMReporter& aError) override
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{
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GetNodeValue(aTextContent);
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}
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virtual void SetTextContentInternal(const nsAString& aTextContent,
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nsIPrincipal* aSubjectPrincipal,
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ErrorResult& aError) override
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{
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// Batch possible DOMSubtreeModified events.
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mozAutoSubtreeModified subtree(OwnerDoc(), nullptr);
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return SetNodeValue(aTextContent, aError);
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}
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// Implementation for nsIContent
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virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
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nsIContent* aBindingParent,
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bool aCompileEventHandlers) override;
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virtual void UnbindFromTree(bool aDeep = true,
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bool aNullParent = true) override;
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virtual already_AddRefed<nsINodeList> GetChildren(uint32_t aFilter) override;
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virtual const nsTextFragment *GetText() override;
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virtual uint32_t TextLength() const override;
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virtual nsresult SetText(const char16_t* aBuffer, uint32_t aLength,
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bool aNotify) override;
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// Need to implement this here too to avoid hiding.
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nsresult SetText(const nsAString& aStr, bool aNotify)
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{
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return SetText(aStr.BeginReading(), aStr.Length(), aNotify);
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}
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virtual nsresult AppendText(const char16_t* aBuffer, uint32_t aLength,
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bool aNotify) override;
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virtual bool TextIsOnlyWhitespace() override;
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bool ThreadSafeTextIsOnlyWhitespace() const final;
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virtual bool HasTextForTranslation() override;
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virtual void AppendTextTo(nsAString& aResult) override;
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MOZ_MUST_USE
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virtual bool AppendTextTo(nsAString& aResult,
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const fallible_t&) override;
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virtual void SaveSubtreeState() override;
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#ifdef DEBUG
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virtual void List(FILE* out, int32_t aIndent) const override;
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virtual void DumpContent(FILE* out, int32_t aIndent, bool aDumpAll) const override;
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#endif
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virtual nsXBLBinding* DoGetXBLBinding() const override;
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virtual bool IsNodeOfType(uint32_t aFlags) const override;
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virtual bool IsLink(nsIURI** aURI) const override;
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virtual nsresult Clone(dom::NodeInfo *aNodeInfo, nsINode **aResult,
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bool aPreallocateChildren) const override
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{
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RefPtr<CharacterData> result = CloneDataNode(aNodeInfo, true);
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result.forget(aResult);
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if (!*aResult) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return NS_OK;
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}
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// WebIDL API
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void GetData(nsAString& aData) const;
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virtual void SetData(const nsAString& aData, ErrorResult& rv);
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// nsINode::Length() returns the right thing for our length attribute
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void SubstringData(uint32_t aStart, uint32_t aCount, nsAString& aReturn,
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ErrorResult& rv);
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void AppendData(const nsAString& aData, ErrorResult& rv);
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void InsertData(uint32_t aOffset, const nsAString& aData, ErrorResult& rv);
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void DeleteData(uint32_t aOffset, uint32_t aCount, ErrorResult& rv);
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void ReplaceData(uint32_t aOffset, uint32_t aCount, const nsAString& aData,
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ErrorResult& rv);
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uint32_t TextDataLength() const
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{
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return mText.GetLength();
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}
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//----------------------------------------
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#ifdef DEBUG
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void ToCString(nsAString& aBuf, int32_t aOffset, int32_t aLen) const;
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#endif
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NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(CharacterData)
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protected:
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virtual ~CharacterData();
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virtual Element* GetNameSpaceElement() override
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{
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nsINode *parent = GetParentNode();
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return parent && parent->IsElement() ? parent->AsElement() : nullptr;
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}
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nsresult SetTextInternal(uint32_t aOffset, uint32_t aCount,
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const char16_t* aBuffer, uint32_t aLength,
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bool aNotify,
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CharacterDataChangeInfo::Details* aDetails = nullptr);
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/**
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* Method to clone this node. This needs to be overriden by all derived
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* classes. If aCloneText is true the text content will be cloned too.
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*
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* @param aOwnerDocument the ownerDocument of the clone
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* @param aCloneText if true the text content will be cloned too
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* @return the clone
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*/
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virtual already_AddRefed<CharacterData>
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CloneDataNode(dom::NodeInfo *aNodeInfo, bool aCloneText) const = 0;
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nsTextFragment mText;
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public:
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virtual bool OwnedOnlyByTheDOMTree() override
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{
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return GetParent() && mRefCnt.get() == 1;
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}
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virtual bool IsPurple() override
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{
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return mRefCnt.IsPurple();
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}
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virtual void RemovePurple() override
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{
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mRefCnt.RemovePurple();
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}
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private:
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already_AddRefed<nsAtom> GetCurrentValueAtom();
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_CharacterData_h */
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