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/*
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* Copyright (c) 2003 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: SVG Implementation source file
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*
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*/
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#include "SVGTokenizer.h"
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TTokenizer::TTokenizer( const TPtrC& aString )
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{
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iString.Set( Trim( aString ) );
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iCurrentIndex = 0;
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iPreviousIndex = 0;
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}
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TBool TTokenizer::IsAtEnd()
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{
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return iCurrentIndex >= EndIndex();
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}
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TInt TTokenizer::EndIndex()
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{
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return iString.Length();
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}
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TUint16 TTokenizer::NextChar()
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{
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if ( IsAtEnd() )
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return '\0';
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else
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return iString[iCurrentIndex];
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}
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void TTokenizer::Advance( TInt aCount )
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{
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iCurrentIndex += aCount;
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if ( iCurrentIndex > EndIndex() )
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iCurrentIndex = EndIndex();
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else if ( iCurrentIndex < 0 )
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iCurrentIndex = 0;
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iPreviousIndex = iCurrentIndex;
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}
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TBool TTokenizer::SkipInteger()
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{
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if ( iCurrentIndex >= EndIndex() )
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return EFalse;
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if ( NextChar() == '-' || NextChar() == '+' )
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{
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TInt index = iCurrentIndex;
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iCurrentIndex++;
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if ( SkipInteger() )
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{
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iPreviousIndex = index;
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return ETrue;
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}
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else
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{
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iCurrentIndex = index;
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iPreviousIndex = iCurrentIndex;
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return EFalse;
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}
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}
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iPreviousIndex = iCurrentIndex;
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TInt index = iCurrentIndex;
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while ( index < EndIndex() && IsDigit( iString[index] ) )
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{
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index++;
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}
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if ( IsAtEnd() )
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return EFalse;
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iCurrentIndex = index;
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return ETrue;
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}
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TBool TTokenizer::SkipDecimal()
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{
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if ( iCurrentIndex >= EndIndex() )
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return EFalse;
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if ( NextChar() == '-' || NextChar() == '+' )
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{
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TInt index = iCurrentIndex;
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iCurrentIndex++;
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if ( NextChar() != '-' && NextChar() != '+' && SkipDecimal() )
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{
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iPreviousIndex = index;
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return ETrue;
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}
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else
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{
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iCurrentIndex = index;
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iPreviousIndex = iCurrentIndex;
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return EFalse;
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}
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}
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if ( NextChar() == '.' )
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{
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TInt index = iCurrentIndex;
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Advance( 1 ); // skip '.'
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if ( !IsDigit( NextChar() ) )
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{
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// Only found '.' and no digits following
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Advance( -1 );
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return EFalse;
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}
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else
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{
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// '.xxx'
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SkipInteger();
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iPreviousIndex = index;
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return ETrue;
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}
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}
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else if ( IsDigit( NextChar() ) )
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{
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SkipInteger();
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if ( NextChar() != '.' )
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{
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// 'xxx'
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return ETrue;
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}
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else
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{
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TInt index = iPreviousIndex;//iCurrentIndex;
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Advance( 1 ); // skip '.'
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SkipInteger();
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iPreviousIndex = index;
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return ETrue;
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}
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}
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return EFalse;
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}
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TBool TTokenizer::SkipHex()
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{
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if ( iCurrentIndex >= EndIndex() )
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return EFalse;
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iPreviousIndex = iCurrentIndex;
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TInt index = iCurrentIndex;
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while ( index < EndIndex() && IsHexDigit( iString[index] ) )
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{
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index++;
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}
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if ( IsAtEnd() )
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return EFalse;
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iCurrentIndex = index;
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return ETrue;
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}
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TBool TTokenizer::SkipWhiteSpace()
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{
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if ( iCurrentIndex >= EndIndex() )
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return EFalse;
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iPreviousIndex = iCurrentIndex;
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TInt index = iCurrentIndex;
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while ( index < EndIndex() && IsWhiteSpace( iString[index] ) )
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{
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index++;
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}
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if ( IsAtEnd() )
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return EFalse;
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iCurrentIndex = index;
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return ETrue;
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}
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TBool TTokenizer::SkipUntil( TUint16 aChar )
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{
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if ( IsAtEnd() )
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return EFalse;
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iPreviousIndex = iCurrentIndex;
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TPtrC remaining( &iString.Ptr()[iCurrentIndex], iString.Length() - iCurrentIndex );
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TInt index = IndexOf( remaining, aChar );
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if ( index == -1 )
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return EFalse;
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iCurrentIndex += index;
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return ETrue;
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}
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TBool TTokenizer::SkipUntilEnd( )
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{
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if ( IsAtEnd() )
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return EFalse;
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iPreviousIndex = iCurrentIndex;
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TPtrC remaining( &iString.Ptr()[iCurrentIndex], iString.Length() - iCurrentIndex );
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TInt index = remaining.Length();
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iCurrentIndex += index;
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return ETrue;
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}
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TBool TTokenizer::StartsWith( const TDesC& aString )
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{
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if ( IsAtEnd() || aString.Length() > iString.Length() - iCurrentIndex )
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return EFalse;
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TPtrC remaining( &iString.Ptr()[iCurrentIndex], aString.Length() );
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return remaining == aString;
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}
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TPtrC TTokenizer::SkippedString()
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{
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return TPtrC( &iString.Ptr()[iPreviousIndex], iCurrentIndex - iPreviousIndex );
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}
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TPtrC TTokenizer::Remainder()
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{
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if ( iString.Length() == 0 )
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return TPtrC( NULL, 0 );
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else
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return TPtrC( &iString.Ptr()[iCurrentIndex], iString.Length() - iCurrentIndex );
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}
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//------------------------------------------------------
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// Helping Functions
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//------------------------------------------------------
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TBool TTokenizer::IsWhiteSpace( TUint16 aChar )
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{
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return ( aChar == ' ' ) || ( aChar == '\t' ) || ( aChar == '\n' );
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}
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TBool TTokenizer::IsDigit( TUint16 aChar )
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{
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return ( aChar >= '0' && aChar <= '9' );
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}
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TBool TTokenizer::IsHexDigit( TUint16 aChar )
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{
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return ( aChar >= '0' && aChar <= '9' ) ||
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( aChar >= 'a' && aChar <= 'f' ) ||
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( aChar >= 'A' && aChar <= 'F' );
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}
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TInt TTokenizer::IndexOf( const TDesC& aString, TUint16 aChar )
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{
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TInt length = aString.Length();
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for ( TInt i = 0; i < length; i++ )
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{
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if ( aString[i] == aChar )
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return i;
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}
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return -1;
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}
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TPtrC TTokenizer::Trim( const TDesC& aString )
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{
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TInt startIndex = 0;
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for ( ; startIndex < aString.Length() && IsWhiteSpace( aString[startIndex] ); startIndex++ )
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{
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}
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TInt endIndex = aString.Length();
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for ( ; endIndex > 0 && IsWhiteSpace( aString[endIndex-1] ); endIndex-- )
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{
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}
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return TPtrC( &aString.Ptr()[startIndex], endIndex - startIndex );
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}
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TBool TTokenizer::ParseDecimal( const TDesC& aString, TReal32& aValue, TPtrC& aRemainder )
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{
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TTokenizer tokenizer( aString );
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tokenizer.SkipWhiteSpace();
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// blank, setting to zero
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if ( tokenizer.IsAtEnd() )
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{
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return EFalse;
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}
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if ( tokenizer.SkipDecimal() )
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{
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// Decimal number, extract it
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TPtrC decimalString = tokenizer.SkippedString();
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TLex lex( decimalString );
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// Specify the decimal seperator, instead of using
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// locale specific seperator.
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lex.Val( aValue, '.' );
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tokenizer.SkipWhiteSpace();
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aRemainder.Set( tokenizer.Remainder() );
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return ETrue;
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}
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return EFalse;
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}
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