/*

* Copyright (c) 2002-2004 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:           

*       Provides the TAknFepUIIndicInputManager methods.

*

*/

#include "AknFepUiIndicInputManager.h"

// -----------------------------------------------------------------------------

// TAknFepUiIndicInputManager::ValidateInput

// This function validates the input text given by PtiEngine. This function

// returns the resopnse code depending on the previous character, current input 

// character and the next character. Depending on the response code apropriate 

// action is taken for inputting the current inputed character. This function 

// incorporates the logic for Devanagari alphabate input.  

// -----------------------------------------------------------------------------

TIndicInputResponse TAknFepUiIndicInputManager::ValidateInput( TInt  aKey, 

										  TUint aPrevChar,

										  TUint aCurrChar,

										  TUint /*aNextChar*/, 

										  TBool&  aIsHalantOrMatraAllowed,	

										  TBool aIsStarKeyPressed, 

										  TBool aIsKeyTimerExpired,

										  TPtiTextCase& aNewCase, 

										  TKeyPressLength /*aLength*/,

										  TLanguage aLanguage,

										  TBool aIsRakarPresent /* = EFalse*/,

										  TBool aIsZWSPresent /* = EFalse */ 

#ifdef RD_MARATHI

										  , TBool aIsChandraAPresent /* = EFalse */

#endif // RD_MARATHI

										  )

	{

	TIndicInputResponse keyResponse =  EIndicInputResponseNone;

	TPtiTextCase setcase  = EPtiCaseLower;

	TAknFepUiIndicInputManager::SetHalantOrMatraAllowed( aPrevChar,

														aIsHalantOrMatraAllowed,

														aIsKeyTimerExpired,

														aLanguage );

	switch( aKey )

		{

		case EPtiKey1:

			{

			if( IsCharNukta( aCurrChar, aLanguage ) && 

				( IsCharNuktaConsonant( aPrevChar, aLanguage ) ||

					!IsCharBaseConsonant( aPrevChar, aLanguage ) ) )

				{

				keyResponse = EIndicInputResponseInvalid;

				}

#ifdef RD_MARATHI

			else if( IsCharEyeLashRa( aCurrChar, aLanguage ) )

				{

				keyResponse = EIndicInputResponseInsertEyeLashRa;

				}

#endif // RD_MARATHI

			else if ( IsCharEmpty( aPrevChar, aLanguage ) )

				{

				// The special characters present in key-1 have to be

				// allowed. So the response is not set to digit directly

				// But at the same time, skip the fallback modifiers.

				if( IsCharModifier( aCurrChar, aLanguage ) )

					{

					keyResponse = EIndicInputResponseInvalid;

					}

				}

			else if( IsCharRakar( aCurrChar, aLanguage ) )

				{

				if( aIsHalantOrMatraAllowed )

					{

					keyResponse = EIndicInputResponseInsertRakar;

					}

				else

					{

					keyResponse = EIndicInputResponseInvalid;

					}

				}

			else if( IsCharRepha( aCurrChar, aLanguage ) )

				{

				if( IsRephaAllowed( aPrevChar, aLanguage ) ||

					( aIsRakarPresent && !aIsKeyTimerExpired ) )

					{

					keyResponse = EIndicInputResponseInsertRepha;

					}

				else

					{

					keyResponse = EIndicInputResponseInvalid;

					}

				}

			else if ( IsCharOther( aPrevChar, aLanguage )

				     || IsCharVirama( aPrevChar, aLanguage ) )	

				{

				// Since the response  cannot be set to digit

				// directly here, validate the modifiers first.

				if( IsCharModifier( aCurrChar, aLanguage ) )

					{

					if( !IsModifierAllowed( aPrevChar, aLanguage ) )

						{

						keyResponse = EIndicInputResponseInvalid;

						}

					}

				}

			else if ( IsCharModifier( aPrevChar, aLanguage ) )

				{

				// Unlike in earlier code, the response  cannot be set to

				// Digit directly here. The special characters present in 

				// key-1 have to be allowed. As a result, the fallback 

				// modifiers need to be skipped.

				if( IsCharModifier( aCurrChar, aLanguage ) )

					{

					if( !IsModifierAllowed( aPrevChar, aLanguage ) )

						{

						keyResponse = EIndicInputResponseInvalid;

						}

					}

				else

					{

					if (  ! aIsHalantOrMatraAllowed  )

						{

						setcase = EPtiCaseUpper;	

						}

					else if ( IsCharVirama( aCurrChar, aLanguage ) )

						{

						keyResponse = EIndicInputResponseInsertZWS;

						}	

					}	

				}

#ifdef RD_MARATHI

			else if( IsCharVirama( aCurrChar, aLanguage ) &&

				aIsHalantOrMatraAllowed )

				{

				keyResponse = EIndicInputResponseInsertZWS;

				}

#endif // RD_MARATHI

			// In cases where the response cannot be set to digit directly,

			// each character in key-1 has to be validated. Example in an 

			// Here we validate the Virama, Rakara and Repha

			if( IsCharVirama( aCurrChar, aLanguage ) )

				{

				if( keyResponse != EIndicInputResponseInsertZWS )

					{

					keyResponse = EIndicInputResponseInvalid;

					}

				}

			else if( IsCharRakar( aCurrChar, aLanguage ) )

				{

				if( keyResponse != EIndicInputResponseInsertRakar )

					{

					keyResponse = EIndicInputResponseInvalid;

					}

				}

			else if( IsCharRepha( aCurrChar, aLanguage ) )

				{

				// In case of empty editor, all the modifiers, virama

				// and rakar will be skipped. Even the Repha is to be skipped

				if( keyResponse != EIndicInputResponseInsertRepha )

					{

					keyResponse = EIndicInputResponseInvalid;

					}

				}

			}

			break;

	    case EPtiKey2:

	    case EPtiKey3:

	    	{

    		if ( IsCharEmpty( aPrevChar, aLanguage )

	    		|| IsCharAnVowel( aPrevChar, aLanguage )

        		|| IsCharModifier( aPrevChar, aLanguage ) 

#ifdef RD_MARATHI

				|| ( aIsChandraAPresent && !aIsKeyTimerExpired )

#endif // RD_MARATHI

	    		)

    			{

	    		setcase = EPtiCaseUpper;

	    		}

	    	else if( IsCharVirama( aPrevChar, aLanguage ) )

	    		{

	    		setcase = EPtiCaseUpper;

	    		// Response code changed to EIndicInputResponseNone to avoid

	    		// insertion of ZWS character for Vowels.

	    		keyResponse = EIndicInputResponseNone;

	    		}

	    	else if ( IsCharOther( aPrevChar, aLanguage ) )

	    		{

	    		if ( aIsKeyTimerExpired || IsCharSpace( aPrevChar ) || ( ! aIsHalantOrMatraAllowed ) )

	    			{

	    			setcase = EPtiCaseUpper;	

	    			}

	    		}

	    	else if ( IsCharMatra( aPrevChar, aLanguage ) )

		    	{

	    		if ( aIsKeyTimerExpired )

	    			{

	    			setcase = EPtiCaseUpper;	

	    			}		    	

		    	}		  

	    	else if ( IsCharBaseConsonant( aPrevChar, aLanguage )

		    		|| IsCharNukta( aPrevChar, aLanguage ) )

			    {

			    if ( aIsStarKeyPressed )

			    	{

					setcase = EPtiCaseUpper;	

			    	}					

				}

#ifdef RD_MARATHI

            if( IsCharChandraA( aCurrChar ) )

				{

				keyResponse = EIndicInputResponseInsertChandraA;

				}

#endif // RD_MARATHI

	    	}

	    	break;

	    case EPtiKey4:

	    case EPtiKey5:

	    case EPtiKey6:

	    case EPtiKey7:

	    case EPtiKey8:

	    case EPtiKey9:

	    	{

			if ( aIsStarKeyPressed )

				{

				if( IsCharBaseConsonant( aCurrChar, aLanguage )

			       && ( IsCharBaseConsonant( aPrevChar, aLanguage ) || 

			            IsCharNukta( aPrevChar, aLanguage ) ) )

					{

					keyResponse = EIndicInputResponseInsertZWSandLigature;

					}

				else if( IsCharBaseConsonant( aCurrChar, aLanguage )

			       && IsCharVirama( aPrevChar, aLanguage ) )

					{

					keyResponse = EIndicInputResponseZWSandCharacter;

					}

				}

			else if( IsCharVirama( aPrevChar, aLanguage ) )

				{

				keyResponse = EIndicInputResponseZWSandCharacter;	

				}

	    	}

	    	break;

		case EPtiKey0:

			{

			// Special ligatures added in key-0.

			if( IsCharLigature( aCurrChar, aLanguage ) )

				{

				if ( aIsStarKeyPressed && 

						IsCharBaseConsonant( aPrevChar, aLanguage ) )

					{

					keyResponse = EIndicInputResponseInsertViramaZWSandDirectLigature;

					}

				else if( IsCharVirama( aPrevChar, aLanguage ) && 

						IsCharAtStartOfLigature( aCurrChar, aLanguage ) && 

						!aIsZWSPresent )

					{

					keyResponse = EIndicInputResponseZWSandDirectLigature;

					}

				else

					{

					keyResponse = EIndicInputResponseInsertDirectLigature;

					}

				}

			}

	    break;

	    default:

		  	{

			keyResponse = EIndicInputResponseIgnore;

	      	}

	    	break;

		}

	aNewCase = setcase;

	return keyResponse;

	}

// -----------------------------------------------------------------------------

// TAknFepUiIndicInputManager::IsCharOther

// This function checks for wheather the character is other character. The other 

// character includes numbers, character of other languages and spaces.

// -----------------------------------------------------------------------------

TBool TAknFepUiIndicInputManager::IsCharOther( TUint aChar, TLanguage aLanguage )

	{

	TBool result = EFalse;	

	switch( aLanguage )

		{	

		case ELangMarathi:

		case ELangHindi:

#ifdef RD_HINDI_PHONETIC_INPUT	

		case KLangHindiPhonetic:

#endif		

			{

			if ( !( IsCharBaseConsonant( aChar, aLanguage )

					||	IsCharNukta( aChar, aLanguage )

					||	IsCharMatra( aChar, aLanguage )

					||	IsCharAnVowel( aChar, aLanguage )

					||	IsCharModifier( aChar, aLanguage )

					||	IsCharVirama( aChar, aLanguage )

					||  IsCharRakar( aChar, aLanguage )

					||  IsCharRepha( aChar, aLanguage ) 

					||	IsCharLigature( aChar, aLanguage ) 

#ifdef RD_MARATHI

					||	IsCharEyeLashRa( aChar, aLanguage ) 

					||  IsCharChandraA( aChar )

#endif

					) )

				{

				result = ETrue;	

				}

			}

			break;

		default: /*Other Language*/

			break;

		}

	return( result );	

	}	

// -----------------------------------------------------------------------------

// TAknFepUiIndicInputManager::IsCharEmpty

// This function checks wheather the character is null

// -----------------------------------------------------------------------------

TBool TAknFepUiIndicInputManager::IsCharEmpty( TUint aChar, TLanguage aLanguage )

	{

	TBool result = EFalse;	

	switch( aLanguage )

		{	

		case ELangMarathi:

		case ELangHindi:

#ifdef RD_HINDI_PHONETIC_INPUT	

		case KLangHindiPhonetic:

#endif		

			{

			if ( aChar == 0 )

				{

				result = ETrue;	

				}

			}

			break;

		default: /*Other Language*/

			break;

		}

	return( result );	

	}	

// -----------------------------------------------------------------------------

// TAknFepUiIndicInputManager::IsCharBaseConsonant

// This function checks wheather the character is base consonant

// -----------------------------------------------------------------------------

TBool TAknFepUiIndicInputManager::IsCharBaseConsonant( TUint aChar, TLanguage aLanguage )

	{

	TBool result = EFalse;	

	switch( aLanguage )

		{	

		case ELangMarathi:

		case ELangHindi:

#ifdef RD_HINDI_PHONETIC_INPUT	

		case KLangHindiPhonetic:

#endif		

			{

			if ( ( aChar >= 0x0915 && aChar <= 0x0939 )

					||( aChar >= 0x0958 && aChar <= 0x095F ) )

				{

				result = ETrue;							

				}

			}

			break;

		default: /*Other Language*/

			break;

		}

	return( result );	

	}

// -----------------------------------------------------------------------------

// TAknFepUiIndicInputManager::IsCharNukta

// This function checks wheather the character is Nukta.

// -----------------------------------------------------------------------------

 TBool TAknFepUiIndicInputManager::IsCharNukta( TUint aChar, TLanguage aLanguage )

	{

	TBool result = EFalse;	

	switch( aLanguage )

		{	

		case ELangMarathi:

		case ELangHindi:

#ifdef RD_HINDI_PHONETIC_INPUT	

		case KLangHindiPhonetic:

#endif		

			{

			if ( aChar == 0x093C )

				{

				result = ETrue;	

				}

			}

			break;

		default: /*Other Language*/

			break;

		}

	return( result );	

	}

// -----------------------------------------------------------------------------

// TAknFepUiIndicInputManager::IsCharMatra

// This function checks wheather the character is Nukta.

// -----------------------------------------------------------------------------

TBool TAknFepUiIndicInputManager::IsCharMatra( TUint aChar,  TLanguage aLanguage )

	{

	TBool result = EFalse;	

	switch( aLanguage )

		{	

		case ELangMarathi:

		case ELangHindi:

#ifdef RD_HINDI_PHONETIC_INPUT	

		case KLangHindiPhonetic:

#endif		

			{

			if ( ( aChar >= 0x093E && aChar <= 0x094C ) 

					||( aChar == 0x0962 || aChar == 0x0963 ) )

				{

				result = ETrue;							

				}

			}

			break;

		default: /*Other Language*/

			break;

		}

	return( result );

	}

// -----------------------------------------------------------------------------

// TAknFepUiIndicInputManager::IsCharAnVowel

// This function checks for wheather the character is Nukta.

// -----------------------------------------------------------------------------

 TBool TAknFepUiIndicInputManager::IsCharAnVowel( TUint aChar, TLanguage aLanguage )

	{

	TBool result = EFalse;

	switch( aLanguage )

		{	

		case ELangMarathi:

		case ELangHindi:

#ifdef RD_HINDI_PHONETIC_INPUT	

		case KLangHindiPhonetic:

#endif

			{

			if ( ( aChar>=0x0904 && aChar<=0x0914 )

					||( aChar==0x0960 || aChar==0x0961 ) )

				{

				result = ETrue;							

				}

			}

			break;

		default: /*Other Language*/

			break;

		}

	return( result );

	}

// -----------------------------------------------------------------------------

// TAknFepUiIndicInputManager::IsCharModifier

// This function checks wheather the character is Modifier.

// -----------------------------------------------------------------------------

 TBool TAknFepUiIndicInputManager::IsCharModifier( TUint aChar, TLanguage aLanguage )

	{	

	TBool result = EFalse;

	switch( aLanguage )

		{	

		case ELangMarathi:

		case ELangHindi:

#ifdef RD_HINDI_PHONETIC_INPUT	

		case KLangHindiPhonetic:

#endif		

			{

			if ( aChar>= 0x0901 && aChar <= 0x0903 )