// Copyright (c) 2003-2009 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:+
−
//+
−
+
−
#ifndef __TBIDI_H__+
−
#define __TBIDI_H__+
−
+
−
#include "TGraphicsHarness.h"+
−
+
−
+
−
inline TBool IsSupplementary(TUint aChar)+
−
/**+
−
@param aChar The 32-bit code point value of a Unicode character.+
−
+
−
@return True, if aChar is supplementary character; false, otherwise.+
−
*/+
−
	{+
−
	return (aChar > 0xFFFF);+
−
	}+
−
+
−
inline TBool IsHighSurrogate(TText16 aInt16)+
−
/**+
−
@return True, if aText16 is high surrogate; false, otherwise.+
−
*/+
−
	{+
−
	return (aInt16 & 0xFC00) == 0xD800;+
−
	}+
−
+
−
inline TBool IsLowSurrogate(TText16 aInt16)+
−
/**+
−
@return True, if aText16 is low surrogate; false, otherwise.+
−
*/+
−
	{+
−
	return (aInt16 & 0xFC00) == 0xDC00;+
−
	}+
−
+
−
inline TUint JoinSurrogate(TText16 aHighSurrogate, TText16 aLowSurrogate)+
−
/**+
−
Combine a high surrogate and a low surrogate into a supplementary character.+
−
+
−
@return The 32-bit code point value of the generated Unicode supplementary+
−
        character.+
−
*/+
−
	{+
−
	return ((aHighSurrogate - 0xD7F7) << 10) + aLowSurrogate;+
−
	}+
−
+
−
inline TText16 GetHighSurrogate(TUint aChar)+
−
/**+
−
Retrieve the high surrogate of a supplementary character.+
−
+
−
@param aChar The 32-bit code point value of a Unicode character.+
−
+
−
@return High surrogate of aChar, if aChar is a supplementary character; +
−
        aChar itself, if aChar is not a supplementary character.+
−
*/+
−
	{+
−
	return STATIC_CAST(TText16, 0xD7C0 + (aChar >> 10));+
−
	}+
−
+
−
inline TText16 GetLowSurrogate(TUint aChar)+
−
/**+
−
Retrieve the low surrogate of a supplementary character.+
−
+
−
@param aChar The 32-bit code point value of a Unicode character.+
−
+
−
@return Low surrogate of aChar, if aChar is a supplementary character; +
−
        zero, if aChar is not a supplementary character.+
−
*/+
−
	{+
−
	return STATIC_CAST(TText16, 0xDC00 | (aChar & 0x3FF));+
−
	}+
−
+
−
void AppendCharacter(HBufC *aDes, TUint aChar);+
−
void AppendCharacter(TBuf<24> *aDes, TUint aChar);+
−
+
−
+
−
// Class to implement a wrapping iterator meant for extracting 16 bit characters+
−
// from a block of text+
−
// This class can handle surrogate pairs correctly.+
−
class TextIterator+
−
	{+
−
public:+
−
	TextIterator(const TText16* aData, const TInt aLength) : +
−
	  iData(aData), iLength(aLength), iIndex(0), iWrapped(EFalse), iCombineSurrogatePairs(ETrue)+
−
		{+
−
		}	+
−
	TextIterator(const TText16* aData, const TInt aLength, const TInt aIndex) : +
−
		iData(aData), iLength(aLength), iIndex(aIndex), iWrapped(EFalse), iCombineSurrogatePairs(ETrue)+
−
		{+
−
		}+
−
	TextIterator(const TText16* aData, const TInt aLength, const TInt aIndex, TBool aCombineSurrogatePairs) : +
−
		iData(aData), iLength(aLength), iIndex(aIndex), iWrapped(EFalse), iCombineSurrogatePairs(aCombineSurrogatePairs)+
−
		{+
−
		}+
−
	// Next character from data - wrap pointer to keep within data.+
−
	// Get current char, then move the internal pointer forward to next char.+
−
	TUint NextChar()+
−
		{+
−
		TUint ch = Char();+
−
		if (iCombineSurrogatePairs && IsSupplementary(ch))+
−
			iIndex += 2;+
−
		else+
−
			iIndex += 1;+
−
		// wrap+
−
		if (iIndex >= iLength)+
−
			{+
−
			iIndex = 0;+
−
			iWrapped = ETrue;+
−
			}+
−
		return ch;+
−
		}+
−
	// Move the internal pointer backward, then return the char pointed by internal char.+
−
	// Panic if iIndex already = 0.+
−
	TUint PreviousChar()+
−
		{+
−
		ASSERT(iIndex > 0);+
−
		iIndex--;+
−
		if (iCombineSurrogatePairs && IsLowSurrogate(iData[iIndex]))+
−
			{+
−
			ASSERT(iIndex > 0);+
−
			iIndex--;+
−
			ASSERT(IsHighSurrogate(iData[iIndex]));+
−
			}+
−
		else if (iCombineSurrogatePairs && IsHighSurrogate(iData[iIndex]))+
−
			{+
−
			ASSERT(EFalse);+
−
			}+
−
		else+
−
			{+
−
			// do nothing+
−
			}+
−
		return Char();+
−
		}+
−
	//Reset the iterator to the original values+
−
	void Reset()+
−
		{+
−
		iIndex = 0;+
−
		iWrapped = EFalse;+
−
		}+
−
	void SetIndex(const TInt aIndex)+
−
		{+
−
		iIndex = aIndex;+
−
		iWrapped = EFalse;+
−
		}+
−
	//Has the iterator wrapped back to the start of the buffer at least once?+
−
	TBool Wrapped() const+
−
		{+
−
		return iWrapped;+
−
		}+
−
	//Where is the current buffer index?+
−
	TInt Index() const+
−
		{+
−
		return iIndex;+
−
		}+
−
	//Return pointer to data+
−
	const TText16* Ptr() const+
−
		{+
−
		return iData;+
−
		}+
−
	//Get length of data+
−
	TInt Length() const+
−
		{+
−
		return iLength;+
−
		}+
−
	//Get character at current index+
−
	TUint Char() const+
−
		{+
−
		TUint ch = 0xFFFF;+
−
		TText16 i16 = iData[iIndex];+
−
		if (iCombineSurrogatePairs && IsHighSurrogate(i16))+
−
			{+
−
			ASSERT(iIndex+1 < iLength);+
−
			TText16 low = iData[iIndex+1];+
−
			ch = JoinSurrogate(i16, low);+
−
			}+
−
		else if (iCombineSurrogatePairs && IsLowSurrogate(i16))+
−
			{+
−
			ASSERT(EFalse);+
−
			}+
−
		else+
−
			{+
−
			ch = i16;+
−
			}+
−
		return ch;+
−
		}+
−
	// Fill aBuffer with a char, fill at aIndex, guarded by aMaxIndex (excluded).+
−
	// After return, aIndex points to the next position, if aUpdate_aIndex=ETrue.+
−
	// aUpdate_aIndex: do you want to update the parameter aIndex?+
−
	// aUpdate_iIndex: do you want to update the member variable iIndex?+
−
	// aChar: [out] current char+
−
	TBool NextCharInto(TDes &aBuffer, TInt &aIndex, TInt aMaxIndex=-1, TBool aUpdate_aIndex=ETrue, TBool aUpdate_iIndex=ETrue, TUint *aChar=NULL)+
−
		{+
−
		if (aMaxIndex < 0)+
−
			aMaxIndex = aBuffer.Length();+
−
		if (aIndex >= aMaxIndex)+
−
			return EFalse;+
−
+
−
		TUint ch = Char();+
−
		if (iCombineSurrogatePairs && IsSupplementary(ch))+
−
			{+
−
			if (aIndex+1 >= aMaxIndex)+
−
				return EFalse;+
−
			aBuffer[aIndex] = GetHighSurrogate(ch);+
−
			aBuffer[aIndex+1] = GetLowSurrogate(ch);+
−
			if (aUpdate_aIndex)+
−
				aIndex += 2;+
−
			}+
−
		else+
−
			{+
−
			aBuffer[aIndex] = (TText16)ch;+
−
			if (aUpdate_aIndex)+
−
				aIndex++;+
−
			}+
−
		if (aChar)+
−
			*aChar = ch;+
−
		if (aUpdate_iIndex)+
−
			{+
−
			if (iCombineSurrogatePairs && IsSupplementary(ch))+
−
				iIndex += 2;+
−
			else+
−
				iIndex += 1;+
−
			if (iIndex >= iLength)+
−
				{+
−
				iIndex = 0;+
−
				iWrapped = ETrue;+
−
				}+
−
			}+
−
		return ETrue;+
−
		}+
−
	// Fill aBuffer from aIndex to aMaxIndex (excluded).+
−
	// aMaxIndex=-1 means fill to index=aBuffer.Length.+
−
	// After return, aIndex points to the next position, if aUpdate_aIndex=ETrue.+
−
	TBool FillInto(TDes &aBuffer, TInt &aIndex, TInt aMaxIndex=-1)+
−
		{+
−
		if (aMaxIndex == -1)+
−
			aMaxIndex = aBuffer.Length();+
−
		while (aIndex < aMaxIndex)+
−
			{+
−
			TBool b = NextCharInto(aBuffer, aIndex, aMaxIndex);+
−
			if (!b)+
−
				{+
−
				return ETrue;+
−
				}+
−
			}+
−
		return ETrue;+
−
		}+
−
+
−
private:+
−
	const TText16* iData;+
−
	TInt  iLength;+
−
	TInt  iIndex;+
−
	TBool iWrapped;+
−
	TBool iCombineSurrogatePairs;	// ETrue = combine surrogates; EFalse = take single surrogate as character+
−
	};+
−
+
−
class CTBiDiStep : public CTGraphicsStep+
−
	{+
−
public:+
−
	CTBiDiStep();+
−
protected:	+
−
	//from CTGraphicsStep+
−
	virtual CTGraphicsBase* CreateTestL();+
−
	};+
−
+
−
_LIT(KTBiDiStep,"TBiDi");+
−
+
−
+
−
#endif+
−