textrendering/texthandling/stext/TxtWriter.h
author Pat Downey <patd@symbian.org>
Wed, 01 Sep 2010 12:39:40 +0100
branchRCL_3
changeset 55 336bee5c2d35
parent 0 1fb32624e06b
permissions -rw-r--r--
Revert incorrect RCL_3 drop: Revision: 201021 Kit: 201035
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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#ifndef __TXTWRITER_H__
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#define __TXTWRITER_H__
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#include <e32std.h>
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//////////////////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////////////////
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// MTextWriter interface
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/**
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MTextWriter class is an interface, implemented by TParagraphTextWriter and
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TLineTextWriter classes. It offers two functions:
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1) void WriteL(TText aChar) - to output a single character.
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2) void FlushL() - if the implementations have stored some of the incomming characters 
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                   for further processing, they will be immediately flushed to the output.
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They are not supposed to be called directly. MTextWriter class, together with TSLBTransaltor,
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MOutputChar, TParagraphTextWriter and TLineTextWriter classes builds a framework, used for 
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correct filtering of the 0x0D and 0x0A characters and translating them to line breaks or spaces,
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depending of the text file organisation.
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@internalComponent
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*/
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class MTextWriter
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	{
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public:
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	virtual void WriteL(TText aChar) = 0;
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	virtual void FlushL()
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		{
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		}
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	};
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//////////////////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////////////////
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// MOutputChar interface
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/**
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MOutputChar interface offers "void OutputCharL(TText aChar)" method, which gets as an input 
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character, which may be a line break or something else, but not 0x0D or 0x0A characters, which
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were filtered earlier.
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@internalComponent
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*/
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class MOutputChar
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	{
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public:
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	virtual void OutputCharL(TText aChar) = 0;
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	};
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//////////////////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////////////////
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// TSLBTransaltor class
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/**
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TSLBTransaltor class offers functionality for processing a stream of characters, filtering
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0x0D and 0x0A characters or (0x0D 0x0A) combination, and transating them to single line breaks.  
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It sends translated characters for a further processing using MTextWriter::WriteL() call.
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The translation rules are:
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 - 0x0D      - line break;
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 - 0x0A      - line break;
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 - 0x0D 0x0A - line break;
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@internalComponent
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*/
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class TSLBTransaltor
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	{
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public:
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	inline TSLBTransaltor(MTextWriter& aTextWriter);
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	void ProcessL(TText aChar);
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	void FlushL();
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private:
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	MTextWriter&	iTextWriter;
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	TText			iPrevChar;
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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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TParagraphTextWriter class is a concrete implementation of MTextWriter interface.
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It is used to translate line breaks in the input sequence to paragraph delimiters.
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Every line break from the input is replaced with paragraph delimiter in the output.
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MOutputChar interface is used for the output.
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@internalComponent
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*/
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NONSHARABLE_CLASS(TParagraphTextWriter) : public MTextWriter
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	{
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public:
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	inline TParagraphTextWriter(MOutputChar& aOutputChar);
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	virtual void WriteL(TText aChar);
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private:
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	MOutputChar&	iOutputChar;
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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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TLineTextWriter class is a concrete implementation of MTextWriter interface.
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It is used to translate line breaks in the input sequence 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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MOutputChar interface is used for the output.
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@internalComponent
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*/
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NONSHARABLE_CLASS(TLineTextWriter) : public MTextWriter
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	{
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public:
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	inline TLineTextWriter(MOutputChar& aOutputChar);
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	virtual void WriteL(TText aChar);
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	virtual void FlushL();
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private:
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	MOutputChar&	iOutputChar;
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	TText			iPrevChar;
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	};
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#include "TxtWriter.inl"
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#endif //__TXTWRITER_H__