зеркало из https://github.com/mozilla/gecko-dev.git
387 строки
12 KiB
C++
387 строки
12 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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* nsIContentSerializer implementation that can be used with an
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* nsIDocumentEncoder to convert a DOM into plaintext in a nice way
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* (eg for copy/paste as plaintext).
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*/
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#ifndef nsPlainTextSerializer_h__
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#define nsPlainTextSerializer_h__
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#include "mozilla/Attributes.h"
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#include "mozilla/Maybe.h"
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#include "nsCOMPtr.h"
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#include "nsAtom.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsIContentSerializer.h"
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#include "nsIDocumentEncoder.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include <stack>
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class nsIContent;
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namespace mozilla {
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namespace dom {
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class DocumentType;
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class Element;
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} // namespace dom
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} // namespace mozilla
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class nsPlainTextSerializer final : public nsIContentSerializer {
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public:
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nsPlainTextSerializer();
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(nsPlainTextSerializer)
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// nsIContentSerializer
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NS_IMETHOD Init(uint32_t flags, uint32_t aWrapColumn,
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const mozilla::Encoding* aEncoding, bool aIsCopying,
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bool aIsWholeDocument, bool* aNeedsPreformatScanning,
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nsAString& aOutput) override;
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NS_IMETHOD AppendText(nsIContent* aText, int32_t aStartOffset,
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int32_t aEndOffset) override;
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NS_IMETHOD AppendCDATASection(nsIContent* aCDATASection, int32_t aStartOffset,
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int32_t aEndOffset) override;
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NS_IMETHOD AppendProcessingInstruction(
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mozilla::dom::ProcessingInstruction* aPI, int32_t aStartOffset,
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int32_t aEndOffset) override {
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return NS_OK;
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}
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NS_IMETHOD AppendComment(mozilla::dom::Comment* aComment,
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int32_t aStartOffset, int32_t aEndOffset) override {
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return NS_OK;
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}
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NS_IMETHOD AppendDoctype(mozilla::dom::DocumentType* aDoctype) override {
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return NS_OK;
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}
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NS_IMETHOD AppendElementStart(
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mozilla::dom::Element* aElement,
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mozilla::dom::Element* aOriginalElement) override;
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NS_IMETHOD AppendElementEnd(mozilla::dom::Element* aElement,
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mozilla::dom::Element* aOriginalElement) override;
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NS_IMETHOD FlushAndFinish() override;
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NS_IMETHOD Finish() override;
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NS_IMETHOD GetOutputLength(uint32_t& aLength) const override;
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NS_IMETHOD AppendDocumentStart(mozilla::dom::Document* aDocument) override;
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NS_IMETHOD ScanElementForPreformat(mozilla::dom::Element* aElement) override;
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NS_IMETHOD ForgetElementForPreformat(
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mozilla::dom::Element* aElement) override;
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private:
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~nsPlainTextSerializer();
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nsresult GetAttributeValue(const nsAtom* aName, nsString& aValueRet) const;
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void AddToLine(const char16_t* aStringToAdd, int32_t aLength);
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void MaybeWrapAndOutputCompleteLines();
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// @param aSoftLineBreak A soft line break is a space followed by a linebreak
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// (cf. https://www.ietf.org/rfc/rfc3676.txt, section 4.2).
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void EndLine(bool aSoftLineBreak, bool aBreakBySpace = false);
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void EnsureVerticalSpace(int32_t noOfRows);
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void ConvertToLinesAndOutput(const nsAString& aString);
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void Write(const nsAString& aString);
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// @return true, iff the elements' whitespace and newline characters have to
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// be preserved according to its style or because it's a `<pre>`
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// element.
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bool IsElementPreformatted() const;
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bool IsInOL() const;
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bool IsInOlOrUl() const;
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bool IsCurrentNodeConverted() const;
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bool MustSuppressLeaf() const;
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/**
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* Returns the local name of the element as an atom if the element is an
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* HTML element and the atom is a static atom. Otherwise, nullptr is returned.
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*/
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static nsAtom* GetIdForContent(nsIContent* aContent);
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nsresult DoOpenContainer(const nsAtom* aTag);
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void OpenContainerForOutputFormatted(const nsAtom* aTag);
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nsresult DoCloseContainer(const nsAtom* aTag);
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void CloseContainerForOutputFormatted(const nsAtom* aTag);
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nsresult DoAddLeaf(const nsAtom* aTag);
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void DoAddText();
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// @param aText Ignored if aIsLineBreak is true.
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void DoAddText(bool aIsLineBreak, const nsAString& aText);
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inline bool DoOutput() const { return mHeadLevel == 0; }
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static inline bool IsQuotedLine(const nsAString& aLine) {
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return !aLine.IsEmpty() && aLine.First() == char16_t('>');
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}
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// Stack handling functions
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bool GetLastBool(const nsTArray<bool>& aStack);
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void SetLastBool(nsTArray<bool>& aStack, bool aValue);
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void PushBool(nsTArray<bool>& aStack, bool aValue);
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bool PopBool(nsTArray<bool>& aStack);
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bool IsIgnorableRubyAnnotation(const nsAtom* aTag) const;
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// @return true, iff the elements' whitespace and newline characters have to
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// be preserved according to its style or because it's a `<pre>`
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// element.
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static bool IsElementPreformatted(mozilla::dom::Element* aElement);
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// https://drafts.csswg.org/css-display/#block-level
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static bool IsCssBlockLevelElement(mozilla::dom::Element* aElement);
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private:
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uint32_t mHeadLevel;
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class Settings {
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public:
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enum class HeaderStrategy {
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kNoIndentation,
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kIndentIncreasedWithHeaderLevel,
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kNumberHeadingsAndIndentSlightly
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};
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// May adapt the flags.
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//
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// @param aFlags As defined in nsIDocumentEncoder.idl.
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void Init(int32_t aFlags, uint32_t aWrapColumn);
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// Pref: converter.html2txt.structs.
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bool GetStructs() const { return mStructs; }
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// Pref: converter.html2txt.header_strategy.
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HeaderStrategy GetHeaderStrategy() const { return mHeaderStrategy; }
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// @return As defined in nsIDocumentEncoder.idl.
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int32_t GetFlags() const { return mFlags; }
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// @param aFlag As defined in nsIDocumentEncoder.idl. May consist of
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// multiple bitwise or'd flags.
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bool HasFlag(int32_t aFlag) const { return mFlags & aFlag; }
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// Whether the output should include ruby annotations.
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bool GetWithRubyAnnotation() const { return mWithRubyAnnotation; }
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uint32_t GetWrapColumn() const { return mWrapColumn; }
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bool MayWrap() const {
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return GetWrapColumn() && HasFlag(nsIDocumentEncoder::OutputFormatted |
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nsIDocumentEncoder::OutputWrap);
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}
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bool MayBreakLines() const {
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return !HasFlag(nsIDocumentEncoder::OutputDisallowLineBreaking);
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}
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private:
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// @param aPrefHeaderStrategy Pref: converter.html2txt.header_strategy.
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static HeaderStrategy Convert(int32_t aPrefHeaderStrategy);
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// Pref: converter.html2txt.structs.
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bool mStructs = true;
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// Pref: converter.html2txt.header_strategy.
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HeaderStrategy mHeaderStrategy =
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HeaderStrategy::kIndentIncreasedWithHeaderLevel;
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// Flags defined in nsIDocumentEncoder.idl.
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int32_t mFlags = 0;
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// Whether the output should include ruby annotations.
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bool mWithRubyAnnotation = false;
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// The wrap column is how many fixed-pitch narrow
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// (https://unicode.org/reports/tr11/) (e.g. Latin) characters
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// should be allowed on a line. There could be less chars if the chars
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// are wider than latin chars of more if the chars are more narrow.
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uint32_t mWrapColumn = 0;
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};
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Settings mSettings;
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struct Indentation {
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// The number of space characters to be inserted including the length of
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// mHeader.
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int32_t mLength = 0;
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// The header that has to be written in the indent.
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// That could be, for instance, the bullet in a bulleted list.
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nsString mHeader;
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};
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class CurrentLine {
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public:
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void ResetContentAndIndentationHeader();
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// @param aFlags As defined in nsIDocumentEncoder.idl.
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void MaybeReplaceNbspsInContent(int32_t aFlags);
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void CreateQuotesAndIndent(nsAString& aResult) const;
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bool HasContentOrIndentationHeader() const {
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return !mContent.IsEmpty() || !mIndentation.mHeader.IsEmpty();
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}
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// @param aLineBreaker May be nullptr.
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int32_t FindWrapIndexForContent(uint32_t aWrapColumn,
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bool aUseLineBreaker) const;
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// @return Combined width of cite quote level and indentation.
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uint32_t DeterminePrefixWidth() const {
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// XXX: Should calculate prefixwidth with GetUnicharStringWidth
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return (mCiteQuoteLevel > 0 ? mCiteQuoteLevel + 1 : 0) +
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mIndentation.mLength;
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}
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Indentation mIndentation;
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// The number of '>' characters.
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int32_t mCiteQuoteLevel = 0;
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// Excludes indentation and quotes.
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nsString mContent;
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};
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CurrentLine mCurrentLine;
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class OutputManager {
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public:
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/**
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* @param aFlags As defined in nsIDocumentEncoder.idl.
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* @param aOutput An empty string.
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*/
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OutputManager(int32_t aFlags, nsAString& aOutput);
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enum class StripTrailingWhitespaces { kMaybe, kNo };
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void Append(const CurrentLine& aCurrentLine,
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StripTrailingWhitespaces aStripTrailingWhitespaces);
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void AppendLineBreak();
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/**
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* This empties the current line cache without adding a NEWLINE.
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* Should not be used if line wrapping is of importance since
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* this function destroys the cache information.
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*
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* It will also write indentation and quotes if we believe us to be
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* at the start of the line.
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*/
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void Flush(CurrentLine& aCurrentLine);
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bool IsAtFirstColumn() const { return mAtFirstColumn; }
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uint32_t GetOutputLength() const;
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private:
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/**
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* @param aString Last character is expected to not be a line break.
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*/
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void Append(const nsAString& aString);
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// As defined in nsIDocumentEncoder.idl.
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const int32_t mFlags;
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nsAString& mOutput;
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bool mAtFirstColumn;
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nsString mLineBreak;
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};
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mozilla::Maybe<OutputManager> mOutputManager;
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// If we've just written out a cite blockquote, we need to remember it
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// so we don't duplicate spaces before a <pre wrap> (which mail uses to quote
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// old messages).
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bool mHasWrittenCiteBlockquote;
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int32_t mFloatingLines; // To store the number of lazy line breaks
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// Treat quoted text as though it's preformatted -- don't wrap it.
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// Having it on a pref is a temporary measure, See bug 69638.
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int32_t mSpanLevel;
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int32_t mEmptyLines; // Will be the number of empty lines before
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// the current. 0 if we are starting a new
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// line and -1 if we are in a line.
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bool mInWhitespace;
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bool mPreFormattedMail; // we're dealing with special DOM
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// used by Thunderbird code.
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// While handling a new tag, this variable should remind if any line break
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// is due because of a closing tag. Setting it to "TRUE" while closing the
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// tags. Hence opening tags are guaranteed to start with appropriate line
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// breaks.
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bool mLineBreakDue;
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bool mPreformattedBlockBoundary;
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int32_t mHeaderCounter[7]; /* For header-numbering:
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Number of previous headers of
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the same depth and in the same
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section.
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mHeaderCounter[1] for <h1> etc. */
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RefPtr<mozilla::dom::Element> mElement;
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// For handling table rows
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AutoTArray<bool, 8> mHasWrittenCellsForRow;
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// Values gotten in OpenContainer that is (also) needed in CloseContainer
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AutoTArray<bool, 8> mIsInCiteBlockquote;
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// The tag stack: the stack of tags we're operating on, so we can nest.
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// The stack only ever points to static atoms, so they don't need to be
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// refcounted.
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const nsAtom** mTagStack;
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uint32_t mTagStackIndex;
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// The stack indicating whether the elements we've been operating on are
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// CSS preformatted elements, so that we can tell if the text inside them
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// should be formatted.
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std::stack<bool> mPreformatStack;
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// Content in the stack above this index should be ignored:
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uint32_t mIgnoreAboveIndex;
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// The stack for ordered lists
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AutoTArray<int32_t, 100> mOLStack;
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uint32_t mULCount;
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bool mUseLineBreaker = false;
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// Conveniance constant. It would be nice to have it as a const static
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// variable, but that causes issues with OpenBSD and module unloading.
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const nsString kSpace;
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// mIgnoredChildNodeLevel is used to tell if current node is an ignorable
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// child node. The initial value of mIgnoredChildNodeLevel is 0. When
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// serializer enters those specific nodes, mIgnoredChildNodeLevel increases
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// and is greater than 0. Otherwise when serializer leaves those nodes,
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// mIgnoredChildNodeLevel decreases.
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uint32_t mIgnoredChildNodeLevel;
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};
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nsresult NS_NewPlainTextSerializer(nsIContentSerializer** aSerializer);
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#endif
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