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| -rw-r--r-- | sax/source/tools/fastserializer.hxx | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/sax/source/tools/fastserializer.hxx b/sax/source/tools/fastserializer.hxx new file mode 100644 index 000000000..109ada3c7 --- /dev/null +++ b/sax/source/tools/fastserializer.hxx @@ -0,0 +1,255 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * 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/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifndef INCLUDED_SAX_SOURCE_TOOLS_FASTSERIALIZER_HXX +#define INCLUDED_SAX_SOURCE_TOOLS_FASTSERIALIZER_HXX + +#include <com/sun/star/xml/sax/XFastTokenHandler.hpp> +#include <com/sun/star/io/XOutputStream.hpp> + +#include <sax/fastattribs.hxx> +#include <sax/fshelper.hxx> +#include "CachedOutputStream.hxx" + +#include <stack> +#include <string_view> +#include <map> +#include <memory> + +namespace sax_fastparser { + +struct TokenValue +{ + sal_Int32 nToken; + const char *pValue; + TokenValue(sal_Int32 _nToken, const char *_pValue) : nToken(_nToken), pValue(_pValue) {} +}; +typedef std::vector<TokenValue> TokenValueList; + +/// Receives notification of sax document events to write into an XOutputStream. +class FastSaxSerializer +{ + typedef css::uno::Sequence< ::sal_Int8 > Int8Sequence; + typedef css::uno::Sequence< ::sal_Int32 > Int32Sequence; + +public: + explicit FastSaxSerializer(const css::uno::Reference< css::io::XOutputStream >& xOutputStream); + ~FastSaxSerializer(); + + css::uno::Reference< css::io::XOutputStream > const & getOutputStream() const; + /// called by FSHelper to put data in for writeTokenValueList + TokenValueList& getTokenValueList() { return maTokenValues; } + + /** called by the parser when parsing of an XML stream is started. + */ + void startDocument(); + + /** called by the parser after the last XML element of a stream is processed. + */ + void endDocument(); + + /** receives notification of the beginning of an element. + + @param Element + contains the integer token from the <type>XFastTokenHandler</type> + registered at the <type>XFastParser</type>.<br> + + If the element has a namespace that was registered with the + <type>XFastParser</type>, <param>Element</param> contains the integer + token of the elements local name from the <type>XFastTokenHandler</type> + and the integer token of the namespace combined with an arithmetic + <b>or</b> operation. + + @param pAttrList + Contains a <type>FastAttributeList</type> to access the attributes + from the element. + + */ + void startFastElement( ::sal_Int32 Element, FastAttributeList const * pAttrList = nullptr ); + + /** receives notification of the end of a known element. + @see startFastElement + */ + void endFastElement( ::sal_Int32 Element ); + + /** receives notification of the beginning of a single element. + + @param Element + contains the integer token from the <type>XFastTokenHandler</type> + registered at the <type>XFastParser</type>.<br> + + If the element has a namespace that was registered with the + <type>XFastParser</type>, <param>Element</param> contains the integer + token of the elements local name from the <type>XFastTokenHandler</type> + and the integer token of the namespace combined with an arithmetic + <b>or</b> operation. + + @param pAttrList + Contains a <type>FastAttributeList</type> to access the attributes + from the element. + + */ + void singleFastElement( ::sal_Int32 Element, FastAttributeList const * pAttrList = nullptr ); + + // C++ helpers + void writeId( ::sal_Int32 Element ); + OString getId( ::sal_Int32 Element ); + + void write( double value ); + void write( std::u16string_view s, bool bEscape = false ); + void write( const OString& s, bool bEscape = false ); + void write( const char* pStr, sal_Int32 nLen, bool bEscape = false ); + +public: + /** From now on, don't write directly to the stream, but to top of a stack. + + This is to be able to change the order of the data being written. + If you need to write eg. + p, r, rPr, [something], /rPr, t, [text], /t, /r, /p, + but get it in order + p, r, t, [text], /t, rPr, [something], /rPr, /r, /p, + simply do + p, r, mark(), t, [text], /t, mark(), rPr, [something], /rPr, + mergeTopMarks( MergeMarks::PREPEND ), mergeTopMarks( MergeMarks::APPEND ), /r, /p + and you are done. + + @param nTag debugging aid to ensure mark and merge match in LIFO order + */ + void mark(sal_Int32 nTag, const Int32Sequence& rOrder); + + /** Merge 2 topmost marks. + + The possibilities: prepend the top before the second top-most + mark, append it, append it later or ignore; prepending brings the possibility + to switch parts of the output, appending later allows to write some + output in advance. + + Writes the result to the output stream if the mark stack becomes empty + by the operation. + + When the MergeMarks::POSTPONE is specified, the merge happens just + before the next merge. + + @param nTag debugging aid to ensure mark and merge match in LIFO order + + @see mark() + */ + void mergeTopMarks(sal_Int32 nTag, + sax_fastparser::MergeMarks eMergeType); + +private: + /** Helper class to cache data and write in chunks to XOutputStream or ForMerge::append. + * Its flush method needs to be called before touching maMarkStack + * to ensure correct order of ForSort methods. + */ + CachedOutputStream maCachedOutputStream; + css::uno::Reference< css::xml::sax::XFastTokenHandler > mxFastTokenHandler; + + class ForMerge : public ForMergeBase + { + Int8Sequence maData; + Int8Sequence maPostponed; + + public: + sal_Int32 const m_Tag; +#ifdef DBG_UTIL + // pending close tags, followed by pending open tags + std::deque<sal_Int32> m_DebugEndedElements; + std::deque<sal_Int32> m_DebugStartedElements; + // ... and another buffer for maPostponed ... + std::deque<sal_Int32> m_DebugPostponedEndedElements; + std::deque<sal_Int32> m_DebugPostponedStartedElements; +#endif + + explicit ForMerge(sal_Int32 const nTag) : m_Tag(nTag) {} + + virtual void setCurrentElement( ::sal_Int32 /*nToken*/ ) {} + virtual Int8Sequence& getData(); +#if OSL_DEBUG_LEVEL > 0 + virtual void print(); +#endif + + virtual void prepend( const Int8Sequence &rWhat ); + virtual void append( const css::uno::Sequence<sal_Int8> &rWhat ) override; + void postpone( const Int8Sequence &rWhat ); + + protected: + void resetData( ); + static void merge( Int8Sequence &rTop, const Int8Sequence &rMerge, bool bAppend ); + }; + + class ForSort : public ForMerge + { + std::map< ::sal_Int32, Int8Sequence > maData; + sal_Int32 mnCurrentElement; + + Int32Sequence maOrder; + + public: + ForSort(sal_Int32 const nTag, const Int32Sequence& rOrder) + : ForMerge(nTag) + , mnCurrentElement( 0 ) + , maOrder( rOrder ) + {} + + void setCurrentElement( ::sal_Int32 nToken ) override; + + virtual Int8Sequence& getData() override; + +#if OSL_DEBUG_LEVEL > 0 + virtual void print() override; +#endif + + virtual void prepend( const Int8Sequence &rWhat ) override; + virtual void append( const css::uno::Sequence<sal_Int8> &rWhat ) override; + private: + void sort(); + }; + + std::stack< std::shared_ptr< ForMerge > > maMarkStack; + bool mbMarkStackEmpty; + // Would be better to use OStringBuffer instead of these two + // but then we couldn't get the rtl_String* member :-( + rtl_String *mpDoubleStr; + sal_Int32 mnDoubleStrCapacity; + TokenValueList maTokenValues; + bool mbXescape; ///< whether to escape invalid XML characters as _xHHHH_ in write(const char*,sal_Int32,true) + /* TODO: make that configurable from the outside for + * some specific cases? */ + +#ifdef DBG_UTIL + std::stack<sal_Int32> m_DebugStartedElements; +#endif + + void writeTokenValueList(); + void writeFastAttributeList(FastAttributeList const & rAttrList); + + /** Forward the call to the output stream, or write to the stack. + + The latter in the case that we are inside a mark(). + */ + void writeBytes( const css::uno::Sequence< ::sal_Int8 >& aData ); + void writeBytes( const char* pStr, size_t nLen ); +}; + +} // namespace sax_fastparser + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |