// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

// INCLUDE FILES

#include "languagespecificnumberconverter.h"

#include <e32std.h>

// ============================ MEMBER FUNCTIONS ===============================

static TChar NumberToBase(const TChar& aCharacter )

    {

    const TDigitType d[] = { EDigitTypeWestern, 

                       EDigitTypeArabicIndic, 

                       EDigitTypeEasternArabicIndic, 

                       EDigitTypeDevanagari, 

                       EDigitTypeThai };

    const TInt num = sizeof( d ) / sizeof( d[0] );

    TInt i = 0;

    while( i < num )

        {

        if (aCharacter > TChar( d[i] ) && aCharacter < TChar( d[i]+10 )) 

        	return d[i];

        i++;

        }

    return aCharacter;

    }

/**

This routine is used to convert between European digits and 

Arabic-Indic, Eastern Arabic-Indic, Devanagari or Thai digits 

based on existing digit type setting. 

@param aDes  Parameter to change

*/

void LanguageSpecificNumberConverter::Convert( TDes &aDes )

    {   

    TLocale locale;

    locale.Refresh();

    const TDigitType digitType = locale.DigitType();

    TChar toArea = 0x030;

    switch( digitType )

        {

        case EDigitTypeWestern:

        case EDigitTypeArabicIndic:

        case EDigitTypeEasternArabicIndic:

        case EDigitTypeDevanagari:

        case EDigitTypeThai:

            toArea = digitType;

            break;

        case EDigitTypeUnknown:

        case EDigitTypeAllTypes:

            return;

        }

    const TInt length = aDes.Length();

    for( TInt i = 0; i < length; i++ )

        {

        TChar character = aDes[i];

        TChar fromArea = NumberToBase( character );

        TChar::TBdCategory cat = character.GetBdCategory();

        switch( cat )

            {

            case TChar::EArabicNumber:

            case TChar::EEuropeanNumber:

				character += toArea;

				character -= fromArea;

                aDes[i] = TUint16( character );

                break;

            default: 

            	break;

            }

        }

    }

/**

This routine is used to convert Arabic-Indic, Eastern Arabic-Indic

or Devanagari digits to European digits. 

@param aDes Parameter to change

*/

void LanguageSpecificNumberConverter::ConvertToWesternNumbers( TDes &aDes )

    {   

    const TChar toArea = 0x030;

    const TInt KLastDevanagariDigit = 0x96F;

    const TInt KFirstDevanagariDigit = 0x966;

    const TInt length = aDes.Length();

    for( TInt i=0; i<length; i++ )

        {

        TChar character = aDes[i];

        TChar fromArea = NumberToBase( character );

        TChar::TBdCategory cat = character.GetBdCategory();

        if ( cat == TChar::EArabicNumber || cat == TChar::EEuropeanNumber ||

           ( KFirstDevanagariDigit <= character && character <= KLastDevanagariDigit ) )

            {

            character += toArea;

			character -= fromArea;

            aDes[i] = TUint16( character );    

            }        

        }

    }

/**

This routine is used to check if conversion of digits is needed.

Conversion is needed if user language is   

- Arabic, Urdu or Farsi and if digit type is Arabic-Indic

- Urdu or Farsi and digit type is Eastern Arabic_indic

- Hindi and digit type is Devanagari. 

@return  ETrue if conversion is needed, EFalse if not

*/

TBool LanguageSpecificNumberConverter::IsConversionNeeded()

	{

    TLocale locale;

    locale.Refresh();

    const TLanguage language = User::Language();

	const TDigitType digitType = locale.DigitType();

    if ( ( ( language == ELangArabic || language == ELangUrdu || language == ELangFarsi ) &&

         digitType == EDigitTypeArabicIndic ) 

         || ( ( language == ELangUrdu || language == ELangFarsi ) &&

         digitType == EDigitTypeEasternArabicIndic )

         || ( language == ELangHindi && digitType == EDigitTypeDevanagari )

        )

        {

        return ETrue;

        }

	return EFalse;

	}

// End of File