/* -*- 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 .
 */

#pragma once

#include <svtools/svtdllapi.h>
#include <tools/link.hxx>
#include <tools/ref.hxx>
#include <tools/long.hxx>
#include <rtl/textenc.h>
#include <rtl/ustring.hxx>
#include <memory>

template<typename T> struct SvParser_Impl;
class SvStream;

enum class SvParserState
{
    Accepted = 0,
    NotStarted,
    Working,
    Pending,
    Error
};

template<typename T>
class SVT_DLLPUBLIC SvParser : public SvRefBase
{
    DECL_DLLPRIVATE_LINK( NewDataRead, LinkParamNone*, void );

protected:
    SvStream&           rInput;
    OUString            aToken;             // scanned token
    sal_uInt32          nlLineNr;           // current line number
    sal_uInt32          nlLinePos;          // current column number

    std::unique_ptr<SvParser_Impl<T>> pImplData; // internal data
    tools::Long                m_nTokenIndex;      // current token index to detect loops for seeking backwards
    tools::Long                nTokenValue;        // additional value (RTF)
    bool                bTokenHasValue;     // indicates whether nTokenValue is valid
    SvParserState       eState;             // status also in derived classes

    rtl_TextEncoding    eSrcEnc;            // Source encoding

    sal_uInt64          nNextChPos;
    sal_uInt32          nNextCh;            // current character codepoint in UTF32 for the "lex"

    bool                bSwitchToUCS2 : 1;  // switching is allowed
    bool                bRTF_InTextRead : 1;  // only for RTF-Parser!!!

    struct TokenStackType
    {
        OUString    sToken;
        tools::Long        nTokenValue;
        bool        bTokenHasValue;
        T           nTokenId;

        TokenStackType();
    };

    // methods for Token stack
    T SkipToken( short nCnt = -1 );       // "skip" n Tokens back
    TokenStackType* GetStackPtr( short nCnt );

    // scan the next token:
    //  work off Token stack and call GetNextToken_() if necessary.
    //  That one is responsible for the recognition of new Tokens.
    T GetNextToken();
    virtual T GetNextToken_() = 0;

    // is called for each Token that is recognized in CallParser
    virtual void NextToken( T nToken ) = 0;

    // at times of SvRefBase derivation, not everybody may delete
    virtual ~SvParser() override;

    void ClearTxtConvContext();

private:
    std::unique_ptr<TokenStackType[]> pTokenStack;
    TokenStackType *pTokenStackPos;
    sal_uInt8 nTokenStackSize, nTokenStackPos;

public:
    SvParser( SvStream& rIn, sal_uInt8 nStackSize = 3 );

    virtual  SvParserState CallParser() = 0; // calling of the parser

    SvParserState GetStatus() const;  // StatusInfo

    sal_uInt32   GetLineNr() const;
    sal_uInt32   GetLinePos() const;
    void         IncLineNr();
    sal_uInt32   IncLinePos();
    void         SetLineNr( sal_uInt32 nlNum );
    void         SetLinePos( sal_uInt32 nlPos );

    sal_uInt32 GetNextChar();   // Return next Unicode codepoint in UTF32.
    void RereadLookahead();

    bool IsParserWorking() const;

    Link<LinkParamNone*,void> GetAsynchCallLink() const;

    // for asynchronous reading from the SvStream
    void SaveState( T nToken );
    void RestoreState();
    virtual void Continue( T nToken );

    // Set/get source encoding. The UCS2BEncoding flag is valid if source
    // encoding is UCS2. It specifies a big endian encoding.
    void SetSrcEncoding( rtl_TextEncoding eSrcEnc );
    rtl_TextEncoding GetSrcEncoding() const;

    // May the character set be switched to UCS/2, if a BOM
    // is in the first two characters of the stream?
    void SetSwitchToUCS2( bool bSet );
    bool IsSwitchToUCS2() const;

    // how many bytes a character consists of
    sal_uInt16 GetCharSize() const;

    T GetSaveToken() const;
};


/*========================================================================
 *
 * SvKeyValue.
 *
 *======================================================================*/

class SvKeyValue
{
    /** Representation.
    */
    OUString m_aKey;
    OUString m_aValue;

public:
    /** Construction.
    */
    SvKeyValue()
    {}

    SvKeyValue (const OUString &rKey, const OUString &rValue)
        : m_aKey (rKey), m_aValue (rValue)
    {}

    SvKeyValue (const SvKeyValue &rOther)
        : m_aKey (rOther.m_aKey), m_aValue (rOther.m_aValue)
    {}

    /** Assignment.
    */
    SvKeyValue& operator= (SvKeyValue const &rOther)
    {
        m_aKey   = rOther.m_aKey;
        m_aValue = rOther.m_aValue;
        return *this;
    }

    /** Operation.
    */
    const OUString& GetKey() const { return m_aKey; }
    const OUString& GetValue() const { return m_aValue; }
};

/*========================================================================
 *
 * SvKeyValueIterator.
 *
 *======================================================================*/

class SVT_DLLPUBLIC SvKeyValueIterator : public SvRefBase
{
    struct Impl;
    std::unique_ptr<Impl> mpImpl;

public:
    /** Construction/Destruction.
    */
    SvKeyValueIterator();
    virtual ~SvKeyValueIterator() override;
    SvKeyValueIterator(const SvKeyValueIterator&) = delete;
    SvKeyValueIterator& operator=( const SvKeyValueIterator& ) = delete;

    /** Operation.
    */
    virtual bool GetFirst (SvKeyValue &rKeyVal);
    virtual bool GetNext  (SvKeyValue &rKeyVal);
    virtual void Append   (const SvKeyValue &rKeyVal);
};

typedef tools::SvRef<SvKeyValueIterator> SvKeyValueIteratorRef;

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