unicode-bidi.h

/* ScummVM - Graphic Adventure Engine
 *
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 * file distributed with this source distribution.
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 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * GNU General Public License for more details.
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#ifndef COMMON_STRING_BIDI_H
#define COMMON_STRING_BIDI_H
 
#include "common/str.h"
#include "common/ustr.h"
#include "common/language.h"
 
namespace Common {
 
enum BiDiParagraph {
    BIDI_PAR_ON = 0,
    BIDI_PAR_RTL = 1,
    BIDI_PAR_LTR = 2
};
 
class UnicodeBiDiText {
private:
    uint32 *_log_to_vis_index; // from fribidi conversion
    uint32 *_vis_to_log_index; // from fribidi conversion
    void initWithU32String(const Common::U32String &str);
    Common::String bidiByLine(Common::String line, va_list args);
public:
    const Common::U32String logical; // original string, ordered logically
    Common::U32String visual; // from fribidi conversion, ordered visually
    uint32 _pbase_dir;
 
    UnicodeBiDiText(const Common::U32String &str, BiDiParagraph dir = BIDI_PAR_ON);
    /* This constructor shouldn't be used outside of unicode-bidi.cpp file */
    UnicodeBiDiText(const Common::String &str, const Common::CodePage page, uint32 *pbase_dir);
    ~UnicodeBiDiText();
 
    operator const U32String &() const { return visual; }
 
    uint32 getVisualPosition(uint32 logicalPos) const;
    uint32 getLogicalPosition(uint32 visualPos) const;
    uint32 size() const { return logical.size(); }
};
 
/* just call the constructor for convenience */
UnicodeBiDiText convertBiDiU32String(const U32String &input, BiDiParagraph dir = BIDI_PAR_ON);
String convertBiDiString(const String &input, const Common::Language lang, BiDiParagraph dir = BIDI_PAR_ON);
String convertBiDiString(const String &input, const Common::CodePage page, BiDiParagraph dir = BIDI_PAR_ON);
 
// calls convertBiDiString for each line in isolation
String convertBiDiStringByLines(const String &input, const Common::CodePage page, BiDiParagraph dir = BIDI_PAR_ON);
 
} // End of namespace Common
 
#endif