#include <ecom/implementationproxy.h>

#include <cntdb.h>

#include "cntphone.h"

/*

This is the specification for the implementation of the phone number parser. 

This has been provided by Pekka Jokela (Nokia).

1.   If the first character of the number is '+',  the  '+' character is

left out, and the real phone number is considered to begin right after

that.

 * If there is a '(' as the first character and the plus sign follows then

  i.e. first two characters = '(+' then they must both be removed and the 

  real phone number is considered to begin after them

2.   If the number begins with a  '*' or '#' symbol, all characters to

the last '*' or '#' symbol are ignored, and the real phone number is

considered to begin right after that.

*    If there is '+' character right after the last '#' or '*', the  '+'

character is left out, and the real phone number is considered to

begin after that.

*    If there is '+' character within first five characters, all

characters to the '+' symbol are ignored, and the real phone number is

considered to begin right after that.

3.   If the number contains special characters 'p',' w' and '+' , all

characters after the first special character are ignored.

If the number contains '*' and '#' symbols, i.e. there is a

supplementary service code or a feature code within the number:

*    If the code is finished by '*' or by '#  the real phone number can

be separated easily (refer to the table below, example 1). Even

possible '+' symbol after the code can be left out (example 2).

*    If the code is finished by a digit, the real phone number can not be

separated from the code. In most cases, this is not a problem, because

only seven last digits are significant for comparison (example 3). If

there is '+' symbol between the code and the real phone number, the

'+' has to be within first five characters or otherwise it is

considered to start a DTMF function. (example 4)

And these something else:

*+123+456+++++++++++ ->123

The relevant ETSI specifications are:

ETSI 02.07 - MS Features. Section B.3.4. 

ETSI 03.14 - Defines what DTMF digits are.

ETSI 11.11 - Section 10.5.1. Defines the Separator digit.

*/

const TInt KPlusWithinChars = 5;

const TText KSymbolPause = 'p';

const TText KSymbolWait = 'w';

const TText KSymbolPlus = '+';

const TText KSymbolAsterisk = '*';

const TText KSymbolHash = '#';

//const symbol for checking the opening bracket before a plus

const TText KSymbolOpenBrace = '(';

/** 

 * Extracts the real phone number from a contacts phone number field.

 * This method strips away any DTMF strings or extended services. An empty 

 * descriptor is returned in aRawNumber if the field doesn't have a valid phone 

 * number.

 * 

 * @param aTextualNumber Descriptor containing a contacts model phone number field 

 * @param aRawNumber Descriptor to write the raw number to (loaned by caller)

 */

void CContactDefaultPhoneNumberParser::ExtractRawNumber(const TDesC& aTextualNumber, TDes& aRawNumber)

    {

	aRawNumber.Zero();

	TInt length = aTextualNumber.Length();

	if (length==0)

		{

		return;	

		}

	TPtrC numberPtr( aTextualNumber );

	TUint firstChar = numberPtr[0];

	//gobble spaces

	while (TChar(firstChar).IsSpace())

		{

		--length;

		if (length==0)

			{

			return;

			}

		numberPtr.Set(numberPtr.Right(length));

		firstChar = numberPtr[0];

		}

    // Get left hand side

    if ( firstChar == KSymbolAsterisk || firstChar == KSymbolHash )

        {

        //Check if there is plus on first five chars:

        TInt newStartPlace = numberPtr.Locate( KSymbolPlus );

        if ( newStartPlace>=KPlusWithinChars || newStartPlace==KErrNotFound )

            {

            // There is always star or hash...

            newStartPlace = Max( numberPtr.LocateReverse(KSymbolAsterisk ) ,numberPtr.LocateReverse( KSymbolHash) );

            }

        length = length - newStartPlace -1;

        if ( length <= 0 )

            {

            return;

            }

        numberPtr.Set( numberPtr.Right( length ) );

        firstChar = numberPtr[0];

        }

	//test condition to satisfy the removal of '(' the next if 

	//statement removes the '+' if needed

	if ( firstChar == KSymbolOpenBrace )

		{

		length--;

		numberPtr.Set( numberPtr.Right( length ) );

		// This may be the only character in the descriptor so only access if

		// 1 or more characters left.

		if (length > 0 )

			{

			firstChar = numberPtr[0];

			}        

		}

    if ( firstChar == KSymbolPlus )

        {

        length--;

        numberPtr.Set( numberPtr.Right( length ) );

        }

	if (length==0)

		{

		return;

		}		

    // Find right hand side

    TLex numberLexer( numberPtr );

    for ( ; ; )

        {

        TChar nextChar = numberLexer.Peek();

        if ( !nextChar )

            {

            break;

            }

        if ( nextChar.IsDigit() )

            {

            aRawNumber.Append( nextChar );

            numberLexer.Inc();

            }

        else if ( nextChar == KSymbolAsterisk || nextChar == KSymbolHash )

            {

            aRawNumber.Zero();

            return;

            }

        else

            {

            nextChar.LowerCase();

            if ( nextChar == KSymbolPause

                 || nextChar == KSymbolWait

                 || nextChar == KSymbolPlus)

                {

                break;

                }

            numberLexer.Inc();

            }

        }

    }

CContactDefaultPhoneNumberParser* CContactDefaultPhoneNumberParser::NewL()

	{

	CContactDefaultPhoneNumberParser* self = new (ELeave) CContactDefaultPhoneNumberParser();  // calls c'tor

	return self;

	}

// Export the implementation collection function

const TImplementationProxy ImplementationTable[] = 

    {

    IMPLEMENTATION_PROXY_ENTRY(0x102035FC, 	CContactDefaultPhoneNumberParser::NewL)

    };

EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)

    {

    aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy);

    return ImplementationTable;

    }

/**

 * Standard Epoc32 Dll Entry point

 */