path: root/sw/source/core/inc/scriptinfo.hxx

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 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 SW_SCRIPTINFO_HXX
#define SW_SCRIPTINFO_HXX

#include <list>
#include <deque>
#include "swscanner.hxx"
#include <rtl/ustrbuf.hxx>

class SwTxtNode;
class Point;
class MultiSelection;
typedef std::list< xub_StrLen > PositionList;
typedef std::deque< xub_StrLen > SvXub_StrLens;

#define SPACING_PRECISION_FACTOR 100

/*************************************************************************
 *                      class SwScriptInfo
 *
 * encapsultes information about script changes
 *************************************************************************/

class SwScriptInfo
{
private:
    //! Records a single change in script type.
    struct ScriptChangeInfo
    {
        xub_StrLen position; //!< Character position at which we change script
        sal_uInt8       type;     //!< Script type (Latin/Asian/Complex) that we change to.
        inline ScriptChangeInfo(xub_StrLen pos, sal_uInt8 typ) : position(pos), type(typ) {};
    };
    //TODO - This is sorted, so should probably be a std::set rather than vector.
    //       But we also use random access (probably unnecessarily).
    std::vector<ScriptChangeInfo> aScriptChanges;
    //! Records a single change in direction.
    struct DirectionChangeInfo
    {
        xub_StrLen position; //!< Character position at which we change direction.
        sal_uInt8       type;     //!< Direction that we change to.
        inline DirectionChangeInfo(xub_StrLen pos, sal_uInt8 typ) : position(pos), type(typ) {};
    };
    std::vector<DirectionChangeInfo> aDirectionChanges;
    SvXub_StrLens aKashida;
    SvXub_StrLens aKashidaInvalid;
    SvXub_StrLens aNoKashidaLine;
    SvXub_StrLens aNoKashidaLineEnd;
    SvXub_StrLens aHiddenChg;
    //! Records a single change in compression.
    struct CompressionChangeInfo
    {
        xub_StrLen position; //!< Character position where the change occurs.
        xub_StrLen length;   //!< Length of the segment.
        sal_uInt8       type;     //!< Type of compression that we change to.
        inline CompressionChangeInfo(xub_StrLen pos, xub_StrLen len, sal_uInt8 typ) : position(pos), length(len), type(typ) {};
    };
    std::vector<CompressionChangeInfo> aCompressionChanges;
    xub_StrLen nInvalidityPos;
    sal_uInt8 nDefaultDir;

    void UpdateBidiInfo( const OUString& rTxt );

    sal_Bool IsKashidaValid ( xub_StrLen nKashPos ) const;
    void MarkKashidaInvalid ( xub_StrLen nKashPos );
    void ClearKashidaInvalid ( xub_StrLen nKashPos );
    bool MarkOrClearKashidaInvalid( xub_StrLen nStt, xub_StrLen nLen, bool bMark, xub_StrLen nMarkCount );
    bool IsKashidaLine ( xub_StrLen nCharIdx ) const;

public:
    enum CompType { KANA, SPECIAL_LEFT, SPECIAL_RIGHT, NONE };

    SwScriptInfo();
    ~SwScriptInfo();

    // determines script changes
    void InitScriptInfo( const SwTxtNode& rNode, sal_Bool bRTL );
    void InitScriptInfo( const SwTxtNode& rNode );

    // set/get position from which data is invalid
    inline void SetInvalidity( const xub_StrLen nPos );
    inline xub_StrLen GetInvalidity() const { return nInvalidityPos; };

    // get default direction for paragraph
    inline sal_uInt8 GetDefaultDir() const { return nDefaultDir; };

    // array operations, nCnt refers to array position
    inline size_t CountScriptChg() const;
    inline xub_StrLen GetScriptChg( const size_t nCnt ) const;
    inline sal_uInt8 GetScriptType( const sal_uInt16 nCnt ) const;

    inline size_t CountDirChg() const;
    inline xub_StrLen GetDirChg( const size_t nCnt ) const;
    inline sal_uInt8 GetDirType( const size_t nCnt ) const;

    inline size_t CountKashida() const;
    inline xub_StrLen GetKashida( const size_t nCnt ) const;

    inline size_t CountCompChg() const;
    inline xub_StrLen GetCompStart( const size_t nCnt ) const;
    inline xub_StrLen GetCompLen( const size_t nCnt ) const;
    inline sal_uInt8 GetCompType( const size_t nCnt ) const;

    inline size_t CountHiddenChg() const;
    inline xub_StrLen GetHiddenChg( const size_t nCnt ) const;
    static void CalcHiddenRanges(const SwTxtNode& rNode, MultiSelection& rHiddenMulti);
    static void selectHiddenTextProperty(const SwTxtNode& rNode, MultiSelection &rHiddenMulti);
    static void selectRedLineDeleted(const SwTxtNode& rNode, MultiSelection &rHiddenMulti, bool bSelect=true);

    // "high" level operations, nPos refers to string position
    xub_StrLen NextScriptChg( const xub_StrLen nPos ) const;
    sal_uInt8 ScriptType( const xub_StrLen nPos ) const;

    // Returns the position of the next direction level change.
    // If bLevel is set, the position of the next level which is smaller
    // than the level at position nPos is returned. This is required to
    // obtain the end of a SwBidiPortion
    xub_StrLen NextDirChg( const xub_StrLen nPos,
                           const sal_uInt8* pLevel = 0 ) const;
    sal_uInt8 DirType( const xub_StrLen nPos ) const;

#ifdef DBG_UTIL
    sal_uInt8 CompType( const xub_StrLen nPos ) const;
#endif

    //
    // HIDDEN TEXT STUFF START
    //

/** Hidden text range information - static and non-version

    @descr  Determines if a given position is inside a hidden text range. The
            static version tries to obtain a valid SwScriptInfo object
            via the SwTxtNode, otherwise it calculates the values from scratch.
            The non-static version uses the internally cached informatio
            for the calculation.

    @param  rNode
                The text node.
    @param  nPos
                The given position that should be checked.
    @param  rnStartPos
                Return parameter for the start position of the hidden range.
                STRING_LEN if nPos is not inside a hidden range.
    @param  rnEndPos
                Return parameter for the end position of the hidden range.
                0 if nPos is not inside a hidden range.
    @param  rnEndPos
                Return parameter that contains all the hidden text ranges. Optional.
    @return
            returns true if there are any hidden characters in this paragraph.

*/
    static bool GetBoundsOfHiddenRange( const SwTxtNode& rNode, xub_StrLen nPos,
                                        xub_StrLen& rnStartPos, xub_StrLen& rnEndPos,
                                        PositionList* pList = 0 );
    bool GetBoundsOfHiddenRange(  xub_StrLen nPos, xub_StrLen& rnStartPos,
                                  xub_StrLen& rnEndPos, PositionList* pList = 0 ) const;

    static bool IsInHiddenRange( const SwTxtNode& rNode, xub_StrLen nPos );

/** Hidden text attribute handling

    @descr  Takes a string and either deletes the hidden ranges or sets
            a given character in place of the hidden characters.

    @param  rNode
                The text node.
    @param  rText
                The string to modify.
    @param  cChar
                The character that should replace the hidden characters.
    @param  bDel
                If set, the hidden ranges will be deleted from the text node.
 */
    static sal_uInt16 MaskHiddenRanges(
            const SwTxtNode& rNode, OUStringBuffer& rText,
                                    const xub_StrLen nStt, const xub_StrLen nEnd,
                                    const sal_Unicode cChar );

/** Hidden text attribute handling

    @descr  Takes a SwTxtNode and deletes the hidden ranges from the node.

    @param  rNode
                The text node.
 */
    static void DeleteHiddenRanges( SwTxtNode& rNode );

    //
    // HIDDEN TEXT STUFF END
    //

    // examines the range [ nStart, nStart + nEnd ] if there are kanas
    // returns start index of kana entry in array, otherwise USHRT_MAX
    sal_uInt16 HasKana( xub_StrLen nStart, const xub_StrLen nEnd ) const;

    // modifies the kerning array according to a given compress value
    long Compress( sal_Int32* pKernArray, xub_StrLen nIdx, xub_StrLen nLen,
                   const sal_uInt16 nCompress, const sal_uInt16 nFontHeight,
                   Point* pPoint = NULL ) const;

/** Performes a kashida justification on the kerning array

    @descr  Add some extra space for kashida justification to the
            positions in the kerning array.
    @param  pKernArray
                The printers kerning array. Optional.
    @param  pScrArray
                The screen kerning array. Optional.
    @param  nStt
                Start referring to the paragraph.
    @param  nLen
                The number of characters to be considered.
    @param  nSpaceAdd
                The value which has to be added to a kashida opportunity.
    @return The number of kashida opportunities in the given range
*/
    sal_uInt16 KashidaJustify( sal_Int32* pKernArray, sal_Int32* pScrArray,
                           xub_StrLen nStt, xub_StrLen nLen,
                           long nSpaceAdd = 0) const;

/** Clears array of kashidas marked as invalid
 */
    inline void ClearKashidaInvalid ( xub_StrLen nStt, xub_StrLen nLen ) { MarkOrClearKashidaInvalid( nStt, nLen, false, 0 ); }

/** Marks nCnt kashida positions as invalid
   pKashidaPositions: array of char indices relative to the paragraph
*/
   bool MarkKashidasInvalid ( xub_StrLen nCnt, xub_StrLen* pKashidaPositions );

/** Marks nCnt kashida positions as invalid
    in the given text range
 */
   inline bool MarkKashidasInvalid ( xub_StrLen nCnt, xub_StrLen nStt, xub_StrLen nLen )
       { return MarkOrClearKashidaInvalid( nStt, nLen, true, nCnt ); }

/** retrieves kashida opportunities for a given text range.
   returns the number of kashida positions in the given text range

   pKashidaPositions: buffer to reveive the char indices of the
                      kashida opportunties relative to the paragraph
*/
   sal_uInt16 GetKashidaPositions ( xub_StrLen nStt, xub_StrLen nLen,
                             xub_StrLen* pKashidaPosition );




/** Use regular blank justification instead of kashdida justification for the given line of text.
   nStt Start char index of the line referring to the paragraph.
   nLen Number of characters in the line
*/
   void SetNoKashidaLine ( xub_StrLen nStt, xub_StrLen nLen );

/** Clear forced blank justification for a given line.
   nStt Start char index of the line referring to the paragraph.
   nLen Number of characters in the line
*/
   void ClearNoKashidaLine ( xub_StrLen nStt, xub_StrLen nLen );

/** Checks if text is Arabic text.

     @descr  Checks if text is Arabic text.
     @param  rTxt
                 The text to check
     @param  nStt
                 Start index of the text
     @return Returns if the language is an Arabic language
 */
    static bool IsArabicText( const OUString& rTxt, sal_Int32 nStt, sal_Int32 nLen );

/** Performes a thai justification on the kerning array

    @descr  Add some extra space for thai justification to the
            positions in the kerning array.
    @param  rTxt
                The String
    @param  pKernArray
                The printers kerning array. Optional.
    @param  pScrArray
                The screen kerning array. Optional.
    @param  nIdx
                Start referring to the paragraph.
    @param  nLen
                The number of characters to be considered.
    @param  nSpaceAdd
                The value which has to be added to the cells.
    @return The number of extra spaces in the given range
*/
    static sal_Int32 ThaiJustify( const OUString& rTxt, sal_Int32* pKernArray,
                               sal_Int32* pScrArray, sal_Int32 nIdx,
                               sal_Int32 nLen, sal_Int32 nNumberOfBlanks = 0,
                               long nSpaceAdd = 0 );

    static SwScriptInfo* GetScriptInfo( const SwTxtNode& rNode,
                                        sal_Bool bAllowInvalid = sal_False );

    static sal_uInt8 WhichFont( xub_StrLen nIdx, const OUString* pTxt, const SwScriptInfo* pSI );
};

inline void SwScriptInfo::SetInvalidity( const xub_StrLen nPos )
{
    if ( nPos < nInvalidityPos )
        nInvalidityPos = nPos;
};
inline size_t SwScriptInfo::CountScriptChg() const { return aScriptChanges.size(); }
inline xub_StrLen SwScriptInfo::GetScriptChg( const size_t nCnt ) const
{
    OSL_ENSURE( nCnt < aScriptChanges.size(),"No ScriptChange today!");
    return aScriptChanges[nCnt].position;
}
inline sal_uInt8 SwScriptInfo::GetScriptType( const xub_StrLen nCnt ) const
{
    OSL_ENSURE( nCnt < aScriptChanges.size(),"No ScriptType today!");
    return aScriptChanges[nCnt].type;
}

inline size_t SwScriptInfo::CountDirChg() const { return aDirectionChanges.size(); }
inline xub_StrLen SwScriptInfo::GetDirChg( const size_t nCnt ) const
{
    OSL_ENSURE( nCnt < aDirectionChanges.size(),"No DirChange today!");
    return aDirectionChanges[ nCnt ].position;
}
inline sal_uInt8 SwScriptInfo::GetDirType( const size_t nCnt ) const
{
    OSL_ENSURE( nCnt < aDirectionChanges.size(),"No DirType today!");
    return aDirectionChanges[ nCnt ].type;
}

inline size_t SwScriptInfo::CountKashida() const { return aKashida.size(); }
inline xub_StrLen SwScriptInfo::GetKashida( const size_t nCnt ) const
{
    OSL_ENSURE( nCnt < aKashida.size(),"No Kashidas today!");
    return aKashida[ nCnt ];
}

inline size_t SwScriptInfo::CountCompChg() const { return aCompressionChanges.size(); };
inline xub_StrLen SwScriptInfo::GetCompStart( const size_t nCnt ) const
{
    OSL_ENSURE( nCnt < aCompressionChanges.size(),"No CompressionStart today!");
    return aCompressionChanges[ nCnt ].position;
}
inline xub_StrLen SwScriptInfo::GetCompLen( const size_t nCnt ) const
{
    OSL_ENSURE( nCnt < aCompressionChanges.size(),"No CompressionLen today!");
    return aCompressionChanges[ nCnt ].length;
}

inline sal_uInt8 SwScriptInfo::GetCompType( const size_t nCnt ) const
{
    OSL_ENSURE( nCnt < aCompressionChanges.size(),"No CompressionType today!");
    return aCompressionChanges[ nCnt ].type;
}

inline size_t SwScriptInfo::CountHiddenChg() const { return aHiddenChg.size(); };
inline xub_StrLen SwScriptInfo::GetHiddenChg( const size_t nCnt ) const
{
    OSL_ENSURE( nCnt < aHiddenChg.size(),"No HiddenChg today!");
    return aHiddenChg[ nCnt ];
}


#endif

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