// © 2016 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

/*

 *******************************************************************************

 *

 *   Copyright (C) 1999-2003, International Business Machines

 *   Corporation and others.  All Rights Reserved.

 *

 *******************************************************************************

 *   file name:  scrptrun.h

 *

 *   created on: 10/17/2001

 *   created by: Eric R. Mader

 */

#ifndef __SCRPTRUN_H

#define __SCRPTRUN_H

#include <unicode/utypes.h>

#include <unicode/uobject.h>

#include <unicode/uscript.h>

U_NAMESPACE_BEGIN

struct ScriptRecord

{

    UChar32 startChar;

    UChar32 endChar;

    UScriptCode scriptCode;

};

struct ParenStackEntry

{

    int32_t pairIndex;

    UScriptCode scriptCode;

};

class ScriptRun : public UObject {

public:

    ScriptRun();

    ScriptRun(const char16_t *chars, int32_t length);

    ScriptRun(const char16_t *chars, int32_t start, int32_t length);

    void reset();

    void reset(int32_t start, int32_t count);

    void reset(const char16_t *chars, int32_t start, int32_t length);

    int32_t getScriptStart();

    int32_t getScriptEnd();

    UScriptCode getScriptCode();

    UBool next();

    /**

     * ICU "poor man's RTTI", returns a UClassID for the actual class.

     *

     * @stable ICU 2.2

     */

    virtual inline UClassID getDynamicClassID() const override { return getStaticClassID(); }

    /**

     * ICU "poor man's RTTI", returns a UClassID for this class.

     *

     * @stable ICU 2.2

     */

    static inline UClassID getStaticClassID() { return (UClassID)const_cast<char *>(&fgClassID); }

private:

    static UBool sameScript(int32_t scriptOne, int32_t scriptTwo);

    int32_t charStart;

    int32_t charLimit;

    const char16_t *charArray;

    int32_t scriptStart;

    int32_t scriptEnd;

    UScriptCode scriptCode;

    ParenStackEntry parenStack[128];

    int32_t parenSP;

    static int8_t highBit(int32_t value);

    static int32_t getPairIndex(UChar32 ch);

    static UChar32 pairedChars[];

    static const int32_t pairedCharCount;

    static const int32_t pairedCharPower;

    static const int32_t pairedCharExtra;

    /**

     * The address of this static class variable serves as this class's ID

     * for ICU "poor man's RTTI".

     */

    static const char fgClassID;

};

inline ScriptRun::ScriptRun()

{

    reset(nullptr, 0, 0);

}

inline ScriptRun::ScriptRun(const char16_t *chars, int32_t length)

{

    reset(chars, 0, length);

}

inline ScriptRun::ScriptRun(const char16_t *chars, int32_t start, int32_t length)

{

    reset(chars, start, length);

}

inline int32_t ScriptRun::getScriptStart()

{

    return scriptStart;

}

inline int32_t ScriptRun::getScriptEnd()

{

    return scriptEnd;

}

inline UScriptCode ScriptRun::getScriptCode()

{

    return scriptCode;

}

inline void ScriptRun::reset()

{

    scriptStart = charStart;

    scriptEnd   = charStart;

    scriptCode  = USCRIPT_INVALID_CODE;

    parenSP     = -1;

}

inline void ScriptRun::reset(int32_t start, int32_t length)

{

    charStart = start;

    charLimit = start + length;

    reset();

}

inline void ScriptRun::reset(const char16_t *chars, int32_t start, int32_t length)

{

    charArray = chars;

    reset(start, length);

}

U_NAMESPACE_END

#endif