/*
 * Copyright (C) Ascensio System SIA, 2009-2026
 *
 * This program is a free software product. You can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License (AGPL)
 * version 3 as published by the Free Software Foundation, together with the
 * additional terms provided in the LICENSE file.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
 * details, see the GNU AGPL at: https://www.gnu.org/licenses/agpl-3.0.html
 *
 * You can contact Ascensio System SIA by email at info@onlyoffice.com
 * or by postal mail at 20A-6 Ernesta Birznieka-Upisha Street, Riga,
 * LV-1050, Latvia, European Union.
 *
 * The interactive user interfaces in modified versions of the Program
 * are required to display Appropriate Legal Notices in accordance with
 * Section 5 of the GNU AGPL version 3.
 *
 * No trademark rights are granted under this License.
 *
 * All non-code elements of the Product, including illustrations,
 * icon sets, and technical writing content, are licensed under the
 * Creative Commons Attribution-ShareAlike 4.0 International License:
 * https://creativecommons.org/licenses/by-sa/4.0/legalcode
 *
 * This license applies only to such non-code elements and does not
 * modify or replace the licensing terms applicable to the Program's
 * source code, which remains licensed under the GNU Affero General
 * Public License v3.
 *
 * SPDX-License-Identifier: AGPL-3.0-only
 */
#pragma once

#include "RtfToken.h"
#include "Utils.h"
#include "Basic.h"

class StringStream
{
private: 
	LONG64 m_nSizeAbs;//file size
	LONG64 m_nPosAbs;//position in file

	unsigned char* m_aBuffer;

public:
	StringStream();
	~StringStream();

	void Clear();

	bool SetSource( std::wstring sPath  );
	void getBytes( int nCount, BYTE** pbData );
	int getc();
	void ungetc();
	void putString( std::string sText );

	LONG64 getCurPosition();
	LONG64 getSize();
};

class RtfLex
{
private: 
	StringStream	m_oStream;
	RtfToken		m_oCurToken;

public: 
	NFileWriter::CBufferedFileWriter* m_oFileWriter;
	char* m_caReadBuffer;
	int m_nReadBufSize;

	RtfLex();
	~RtfLex();

	double GetProgress();
	bool SetSource( std::wstring sPath );
	void CloseSource();
	RtfToken NextCurToken();
	void ReadBytes( int nCount, BYTE** pbData );
	RtfToken NextToken();
	void putString( std::string sText );

private: 
	void parseKeyword(RtfToken& token);
	void parseText(int car, RtfToken& token);

	bool GetNextChar( int& nChar );
	void parseTextFile(int car, RtfToken& token);
};