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105 lines
4.9 KiB
105 lines
4.9 KiB
/*
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* Copyright (C) 2015-2022 Département de l'Instruction Publique (DIP-SEM)
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*
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* Copyright (C) 2013 Open Education Foundation
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*
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* Copyright (C) 2010-2013 Groupement d'Intérêt Public pour
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* l'Education Numérique en Afrique (GIP ENA)
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*
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* This file is part of OpenBoard.
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*
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* OpenBoard is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License,
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* with a specific linking exception for the OpenSSL project's
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* "OpenSSL" library (or with modified versions of it that use the
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* same license as the "OpenSSL" library).
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*
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* OpenBoard is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenBoard. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined Parser_h
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#define Parser_h
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#include "Object.h"
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#include "Document.h"
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#include "Page.h"
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#include <string>
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#include <vector>
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namespace merge_lib
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{
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class Document;
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//This class parsed the pdf document and creates
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//an Document object
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class Parser
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{
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public:
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Parser(): _root(0), _fileContent(), _objects(), _document(0) {};
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Document * parseDocument(const char * fileName);
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static const std::string WHITESPACES;
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static const std::string DELIMETERS;
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static const std::string NUMBERS;
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static const std::string WHITESPACES_AND_DELIMETERS;
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static bool getNextWord(std::string & out, const std::string &in, size_t &nextPosition,size_t *found = NULL);
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static std::string getNextToken( const std::string &in, unsigned &position);
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static void trim(std::string &str);
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static std::string findTokenStr(const std::string &content, const std::string &pattern, size_t start,size_t &foundStart, size_t &foundEnd);
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static size_t findToken(const std::string &content, const std::string &keyword,size_t start = 0);
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static size_t findTokenName(const std::string &content, const std::string &keyword,size_t start = 0);
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static unsigned int findEndOfElementContent(const std::string &content, unsigned int startOfPageElement);
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static bool tokenIsAName(const std::string &content, size_t start );
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protected:
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const std::string & _getObjectContent(unsigned int objectPosition, unsigned int & objectNumber, unsigned int & generationNumber, std::pair<unsigned int, unsigned int> &, bool &);
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virtual unsigned int _readTrailerAndReturnRoot();
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private:
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//methods
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virtual void _getFileContent(const char * fileName);
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bool _getNextObject(Object * object);
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void _callObserver(std::string objectContent);
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void _createObjectTree(const char * fileName);
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void _retrieveAllPages(Object * objectWithKids);
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void _fillOutObjects();
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virtual void _readXRefAndCreateObjects();
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unsigned int _getEndOfLineFromContent(unsigned int fromPosition);
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const std::pair<unsigned int, unsigned int> & _getLineBounds(const std::string & str, unsigned int fromPosition);
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const std::string & _getNextToken(unsigned int & fromPosition);
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unsigned int _countTokens(unsigned int leftBound, unsigned int rightBount);
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unsigned int _skipWhiteSpaces(const std::string & str);
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unsigned int _skipWhiteSpacesFromContent(unsigned int fromPosition);
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const std::map<unsigned int, Object::ReferencePositionsInContent> & _getReferences(const std::string & objectContent);
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unsigned int _skipNumber(const std::string & str, unsigned int currentPosition);
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unsigned int _skipWhiteSpaces(const std::string & str, unsigned int fromPosition);
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void _createDocument(const char * docName);
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virtual unsigned int _getStartOfXrefWithRoot();
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unsigned int _readTrailerAndRterievePrev(const unsigned int startPositionForSearch, unsigned int & previosXref);
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void _clearParser();
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protected:
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//members
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Object * _root;
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std::string _fileContent;
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std::map<unsigned int, Object *> _objects;
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Document * _document;
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};
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}
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#endif
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