// pod_lexer.cpp+
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// +
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// Copyright (c) 2009 - 2010 Accenture. All rights reserved.+
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// This component and the accompanying materials are made available+
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// under the terms of the "Eclipse Public License v1.0"+
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// which accompanies this distribution, and is available+
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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// +
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// Initial Contributors:+
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// Accenture - Initial contribution+
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//+
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+
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#include "pod_lexer.h"+
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+
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+
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TPodLexer::TPodLexer(const TDesC& aString)+
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	: iLex(aString), iAttributes(0), iAttributeStackIndex(0)+
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	{+
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	}+
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+
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void TPodLexer::NextTokenL(TPtrC& aToken, TTokenType& aTokenType, TUint& aAttributes, TBool& aEop, TBool& aEos)+
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	{+
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	aTokenType = ETextBlock;+
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	iScratch.Zero();+
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	TBool finished(EFalse);+
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	TBool setAttributes(ETrue);+
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	while (!iLex.Eos() && !finished && (iScratch.Length() < (iScratch.MaxLength() - 1)))+
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		{+
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		iLex.Mark();+
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		TUint16 sequenceIdentifier;+
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		if ((iAttributeStackIndex > 0) && (iLex.Peek() == '>'))+
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			{+
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			if (iScratch.Length() > 0)+
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				{+
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				aAttributes = iAttributes;+
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				setAttributes = EFalse;+
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				finished = ETrue;+
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				}+
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			else+
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				{+
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				iLex.Get();+
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				aTokenType = EAttributePop;+
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				aAttributes = PopAttribute();+
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				setAttributes = EFalse;+
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				finished = ETrue;+
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				}+
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			}+
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		else if (IsInteriorSequenceStart(sequenceIdentifier))+
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			{+
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			if (iScratch.Length() > 0)+
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				{+
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				iLex.UnGetToMark();+
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				finished = ETrue;+
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				}+
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			else+
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				{+
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				switch (sequenceIdentifier)+
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					{+
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					case 'B':+
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						PushAttribute(EBold);+
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						aAttributes = EBold;+
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						setAttributes = EFalse;+
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						aTokenType = EAttributePush;+
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						finished = ETrue;+
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						break;+
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					case 'C':+
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						PushAttribute(ECode);+
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						aAttributes = ECode;+
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						setAttributes = EFalse;+
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						aTokenType = EAttributePush;+
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						finished = ETrue;+
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						break;+
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					case 'E':+
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						if (iLex.Remainder().Length() >= 3)+
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							{+
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							if (iLex.Remainder().Left(3) == _L("gt>"))+
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								{+
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								iLex.Inc(3);+
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								iScratch.Append('>');+
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								}+
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							else if (iLex.Remainder().Left(3) == _L("lt>"))+
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								{+
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								iLex.Inc(3);+
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								iScratch.Append('<');+
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								}+
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							else+
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								{+
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								TUint num;+
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								TInt err = iLex.Val(num);+
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								if (err == KErrNone)+
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									{+
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									iScratch.Append(num);+
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									}+
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								else+
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									{+
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									User::Leave(err);+
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									}+
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								}+
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							}+
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						break;+
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					case 'F':+
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						PushAttribute(EFileName);+
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						aAttributes = EFileName;+
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						setAttributes = EFalse;+
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						aTokenType = EAttributePush;+
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						finished = ETrue;+
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						break;+
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					case 'I':+
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						PushAttribute(EItalic);+
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						aAttributes = EItalic;+
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						setAttributes = EFalse;+
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						aTokenType = EAttributePush;+
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						finished = ETrue;+
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						break;+
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					case 'L':+
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						iLex.Mark();+
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						SkipToClosingAngleBracket();+
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						iLex.UnGet();+
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						iScratch.Copy(iLex.MarkedToken());+
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						iLex.Get();+
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						aTokenType = ELink;+
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						finished = ETrue;+
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						break;+
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					case 'S':+
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					case 'X':+
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						PushAttribute(ENull);+
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						aAttributes = ENull;+
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						setAttributes = EFalse;+
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						aTokenType = EAttributePush;+
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						finished = ETrue;+
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						break;+
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					case 'Z':+
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						if (iLex.Peek() == '>')+
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							{+
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							iLex.Inc();+
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							iLex.Mark();+
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							}+
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						else+
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							{+
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							User::Leave(KErrArgument);+
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							}+
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						break;+
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					}+
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				}+
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			}+
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		else+
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			{+
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			iScratch.Append(iLex.Get());+
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			}+
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		}+
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+
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	if (setAttributes)+
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		{+
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		aAttributes = iAttributes;+
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		}+
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	aToken.Set(iScratch);+
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	aEop = Eop();+
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	aEos = iLex.Eos();+
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	}+
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+
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TInt TPodLexer::SkipToClosingAngleBracket()+
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	{+
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	TInt numSkippedChars = 0;+
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	while (!iLex.Eos())+
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		{+
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		TUint16 sequenceIdentifier;+
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		if (IsInteriorSequenceStart(sequenceIdentifier))+
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			{+
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			numSkippedChars = SkipToClosingAngleBracket();+
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			}+
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		else if (iLex.Get() == '>')+
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			{+
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			break;+
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			}+
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		else+
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			{+
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			++numSkippedChars;+
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			}+
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		}+
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	return numSkippedChars;+
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	}+
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+
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TBool TPodLexer::Eop()+
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	{+
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	_LIT(KParagraphEnd, "\r\n\r\n");+
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	return ((iLex.Remainder().Length() >= 4) && (iLex.Remainder().Left(4) == KParagraphEnd));+
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	}+
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+
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TBool TPodLexer::IsInteriorSequenceStart(TUint16& aSequenceIdentifier)+
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	{+
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	if (iLex.Remainder().Length() >= 2)+
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		{+
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		TUint16 first = iLex.Get();+
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		TUint16 second = iLex.Get();+
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		if (second == '<')+
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			{+
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			switch (first)+
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				{+
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				case 'B':+
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				case 'C':+
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				case 'E':+
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				case 'F':+
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				case 'I':+
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				case 'L':+
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				case 'S':+
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				case 'X':+
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				case 'Z':+
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					aSequenceIdentifier = first;+
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					return ETrue;+
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				}+
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			}+
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		iLex.Inc(-2);+
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		}+
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	return EFalse;+
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	}+
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+
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void TPodLexer::PushAttribute(TAttribute aAttribute)+
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	{+
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	iAttributes |= aAttribute;+
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	iAttributeStack[iAttributeStackIndex++] = aAttribute;+
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	}+
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+
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TPodLexer::TAttribute TPodLexer::PopAttribute()+
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	{+
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	TAttribute poppedAttribute = iAttributeStack[--iAttributeStackIndex];+
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	iAttributes &= ~poppedAttribute;+
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	return poppedAttribute;+
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	}+
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+
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