textrendering/texthandling/stext/TxtWriter.cpp
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/*
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "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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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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#include "TxtWriter.h"
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#include <txtetext.h>
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#include "TXTPLAIN.H"
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#include "OstTraceDefinitions.h"
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#ifdef OST_TRACE_COMPILER_IN_USE
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#include "TxtWriterTraces.h"
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#endif
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static const TText KLineBreak = 0x0A;//Used by TSLBTransaltor class - 0x0A, 0x0D, {0x0D, 0x0A}
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                              //character aequences found in the input stream will be translated 
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                              //to KLineBreak character.
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//////////////////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////////////////
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// TSLBTransaltor class
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/**
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The method processes the input characters and translates 0x0D, 0x0A and 0x0D 0x0A characters
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to line breaks. When the next output character is ready, the method calls WriteL() method of
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the controlled MTextWriter interface (iTextWriter data member) with the output character 
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as an argument. 
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Note: Identified line breaks will be translated to 0x0A character. 0x0A character code is very
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      appropriate for use because all 0x0A, 0x0D or {0x0D, 0x0A} character sequences are filtered
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	  from the input stream and it is guaranteed that the output stream can't have any of them.
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Note: The output character stream should not contain 0x0D character.
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@param aChar Input character to be processed.
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*/
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void TSLBTransaltor::ProcessL(TText aChar)
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	{
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	if(aChar == 0x0A)
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		{
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		//Output a line break. It does not matter what is the previous character.
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		//If it is 0x0D - line break should be the output (0x0D 0x0A). If it is something else - 
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		//(i\x0A) again the output is a line break.
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		iTextWriter.WriteL(KLineBreak);
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		}
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	else
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		{
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		if(iPrevChar == 0x0D)
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			{
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			//Previous character is 0x0D and current character is not 0x0A - then we have to output
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			//a line break - the previous character was stored one call before and now has to be 
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			//processed, if there is no 0x0A character.
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			iTextWriter.WriteL(KLineBreak);
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			}
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		if(aChar != 0x0D)
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			{
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			//If current character is 0x0D, then it will be stored for further processing (in 
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			//case if the next character is 0x0A). If current character is not 0x0D and not 
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			//0x0A - then output it immediately.
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			iTextWriter.WriteL(aChar);
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			}
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		}
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	iPrevChar = aChar;
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	}
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/**
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The method immediately sends to the output any characters, left for further processing. 
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The method shoud be called by the TSLBTransaltor's client after the processing of all 
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input characters.
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*/
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void TSLBTransaltor::FlushL()
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	{
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	if(iPrevChar == 0x0D)
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		{
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		//The last input character is 0x0D and there won't be any more characters, so there is
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		//not a chanse to find a matching 0x0A character. Output it as a single line break.
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		iTextWriter.WriteL(KLineBreak);
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		}
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	//iTextWriter has an internal state too. Flush it.
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	iTextWriter.FlushL();
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	iPrevChar = 0;
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	}
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//////////////////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////////////////
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// TParagraphTextWriter class
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/**
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This method should be called only from TSLBTransaltor implementation. It gets the characters 
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processed by TSLBTransaltor instance as an input and writes them to the output (using MOutputChar
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interface - iOutputChar data member), translating line breaks to paragraph delimiters.
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@param aChar Input character to be processed. It can't be 0x0D, but it could be 0x0A - identified
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             line break.
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*/
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void TParagraphTextWriter::WriteL(TText aChar)
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	{
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	if (aChar == 0x0D)
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	    {
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	    OstTrace0( TRACE_DUMP, TPARAGRAPHTEXTWRITER_WRITEL, "Invariant" );
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	    }
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	__ASSERT_DEBUG(aChar != 0x0D, User::Invariant());
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	if(aChar == KLineBreak)
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		{
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		iOutputChar.OutputCharL(CEditableText::EParagraphDelimiter);
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		}
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	else
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		{
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		iOutputChar.OutputCharL(aChar);
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		}
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	}
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//////////////////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////////////////
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// TLineTextWriter class
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/**
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This method should be called only from TSLBTransaltor implementation. It gets the characters 
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processed by TSLBTransaltor instance as an input and writes them to the output (using MOutputChar
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interface - iOutputChar data member), translating line breaks to paragraph delimiters or spaces.
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The translation rules are:
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 - single line break - space;
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 - double line break - paragraph delimiter;
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@param aChar Input character to be processed. It can't be 0x0D, but it could be 0x0A - identified
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             line break.
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*/
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void TLineTextWriter::WriteL(TText aChar)
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	{
40
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	if (aChar == 0x0D)
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	    {
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	    OstTrace0( TRACE_DUMP, TLINETEXTWRITER_WRITEL, "Invariant" );
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	    }
0
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	__ASSERT_DEBUG(aChar != 0x0D, User::Invariant());
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	TText prevChar = iPrevChar;
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	iPrevChar = aChar;
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	if(aChar != KLineBreak)
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		{
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		if(prevChar == KLineBreak)
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			{
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			//Current character is not a line break, but the previous one is.
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			//Then, it is a single line break - output a space.
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			iOutputChar.OutputCharL(' ');
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			}
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		//Current character is not a line break - then just output it.
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		iOutputChar.OutputCharL(aChar);
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		}
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	else
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		{
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		if(prevChar == KLineBreak)
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			{
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			//Current character is a line break, previous character is a line break too.
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			//Double line break - output a paragraph delimiter.
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			//Both characters are consumed, so iPrevChar is set to 0.
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			iPrevChar = 0;
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			iOutputChar.OutputCharL(CEditableText::EParagraphDelimiter);
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			}
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		}
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	}
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/**
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The method immediately sends to the output any characters, left for further processing. 
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This method should be called only from TSLBTransaltor implementation.
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*/
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void TLineTextWriter::FlushL()
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	{
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	if(iPrevChar == KLineBreak)
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		{
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		//There is no more input characters and the last input charactes is a line break.
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		//Then, treat it as a single line break and output a space.
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		iOutputChar.OutputCharL(' ');
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		}
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	iPrevChar = 0;
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	}