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111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2019
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*
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* This program is a free software product. You can redistribute it and/or
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* modify it under the terms of the GNU Affero General Public License (AGPL)
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* version 3 as published by the Free Software Foundation. In accordance with
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* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
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* that Ascensio System SIA expressly excludes the warranty of non-infringement
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* of any third-party rights.
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*
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* This program is distributed WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
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* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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*
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* You can contact Ascensio System SIA at 20A-12 Ernesta Birznieka-Upisha
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* street, Riga, Latvia, EU, LV-1050.
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*
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* The interactive user interfaces in modified source and object code versions
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* of the Program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU AGPL version 3.
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*
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* Pursuant to Section 7(b) of the License you must retain the original Product
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* logo when distributing the program. Pursuant to Section 7(e) we decline to
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* grant you any rights under trademark law for use of our trademarks.
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*
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* All the Product's GUI elements, including illustrations and icon sets, as
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* well as technical writing content are licensed under the terms of the
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* Creative Commons Attribution-ShareAlike 4.0 International. See the License
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* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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*
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*/
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#ifndef _PDF_READER_LEXER_H
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#define _PDF_READER_LEXER_H
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#include "Object.h"
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#include "Stream.h"
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namespace PdfReader
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{
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class XRef;
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#define TokenBufferSize 128
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//------------------------------------------------------------------------
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// Lexer
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//------------------------------------------------------------------------
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class Lexer
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{
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public:
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// Конструктор для одного потока. Удаляем этот поток в деструкторе.
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Lexer(XRef *pXref, Stream *pStream);
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// Конструкор для одного потока или массива потоков.
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Lexer(XRef *pXref, Object *pObject);
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~Lexer();
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// Считваем следующий объект из потока.
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Object *GetObject(Object *obj);
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// Переходим к началу новой строки.
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void SkipToNextLine();
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// Переходим к следующему символу.
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void SkipChar()
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{
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GetChar();
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}
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Stream *GetStream()
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{
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return m_oCurStream.IsNone() ? (Stream *)NULL : m_oCurStream.GetStream();
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}
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// Текущая позиция. Используется только для сообщений об ошибке, поэтому
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// возвращаемое значение типа int, а не unsigned int.
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int GetPos()
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{
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return m_oCurStream.IsNone() ? -1 : (int)m_oCurStream.StreamGetPos();
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}
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void SetPos(unsigned int unPos, int nDir = 0)
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{
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if (!m_oCurStream.IsNone())
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m_oCurStream.StreamSetPos(unPos, nDir);
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}
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// Проверяем является ли nChar пробелом.
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static bool IsSpace(int nChar);
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private:
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int GetChar();
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int LookChar();
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private:
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Array *m_pStreams; // Массив потоков
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int m_nCurStreamIndex; // Номер текущего потока
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Object m_oCurStream; // Текущий поток
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bool m_bFreeArray; // Должны ли мы в данном классе осовбождать массив потоков?
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char m_sTempBuffer[TokenBufferSize]; // Buffer
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};
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}
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#endif // _PDF_READER_LEXER_H
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