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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 "SVGPointLexer.h"
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#include "stdlib.h"
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#include "string.h"
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// Below define is used as a mask for getting LSB of 16bit number
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// for endian-agnostic progressing.
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#define KLSBMASK ( 0xFF )
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// ---------------------------------------------------------------------------
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//
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// ---------------------------------------------------------------------------
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TSvgPointLexer::TSvgPointLexer( const TDesC& aDes ) :
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iLex( aDes ), iNegativeNumber( EFalse )
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{
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iDataCopy = NULL;
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iDataCopy = aDes.Alloc();
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if ( iDataCopy )
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{
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iData = (TUint16 *)iDataCopy->Ptr();
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iDataEnd = iData + iDataCopy->Length();
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}
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}
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void TSvgPointLexer::Cleanup()
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{
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if ( iDataCopy )
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{
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delete iDataCopy;
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iDataCopy = NULL;
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}
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}
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// ---------------------------------------------------------------------------
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//
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// ---------------------------------------------------------------------------
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TInt32 TSvgPointLexer::GetNext( TChar& aCommand, TFloatFixPt& aVal )
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{
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TReal32 realnum = 0.0;
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// Parse a command and minus symbol
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iNegativeNumber = EFalse;
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aCommand = SkipUntilNum();
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if ( iLex.Eos() && aCommand != 'z' )
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{
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return -1;
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}
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else if ( aCommand == 'z' )
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{
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// if 'z' was found return immediately
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// never parse for numbers
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return KErrNone;
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}
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// Parse a number with fraction
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iLex.Mark();
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if ( SkipToNumEnd() )
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{
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TInt result = TLex( iLex.MarkedToken() ).Val( realnum, '.' ) ;
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if (result != KErrNone)
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{
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realnum= 0.0;
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return result;
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}
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}
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else
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{
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realnum = 0.0;
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}
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if ( iNegativeNumber )
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realnum = -realnum;
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aVal = ( TFloatFixPt ) realnum;
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return KErrNone;
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}
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// ---------------------------------------------------------------------------
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//
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// ---------------------------------------------------------------------------
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TBool TSvgPointLexer::GetNextWithNumOfPoints( TFloatFixPt *aVal, TInt NoOfPoints)
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{
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TReal32 realnum = 0.0;
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TUint8 tmpchar;
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TInt i=0;
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for( i=0;i < NoOfPoints;i++ )
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{
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// Since iData is a TUint16 pointer, and we need to
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// operate with 8bit ASCII, mask LSB to obtain the same
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tmpchar = *iData & KLSBMASK;
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// Traverse the string while character encountered is
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// ' ', LineFeed('\0xa'), ',', Carriage Return ('\0xd')
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while( !(tmpchar^32) || !(tmpchar^10) || !(tmpchar^44) || !(tmpchar^13) )
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{
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iData++;
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if ( iData < iDataEnd )
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{
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tmpchar = *iData & KLSBMASK;
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}
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else
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{
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// Exceeding buffer limits, return error
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return EFalse;
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}
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}
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// Check if character encountered is '-'
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if( !(tmpchar^45) )
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{
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iData++;
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if ( iData < iDataEnd )
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{
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if(SkipToNumEndWithoutLex(realnum) )
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{
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realnum = -realnum;
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}
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else
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{
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return EFalse;
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}
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}
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else // if ( iData < iDataEnd )
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{
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// Exceeding buffer limits, return error
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return EFalse;
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}
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}
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else // Not a '-' char
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{
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if( !(tmpchar^43) ) // to increment the data if '+' is given
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{
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iData++;
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}
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if( !SkipToNumEndWithoutLex(realnum) )
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{
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return EFalse;
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}
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}
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// Save the converted number into float array
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// provided by caller.
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aVal[i] = ( TFloatFixPt )(realnum);
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}
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return ETrue;
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}
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//
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// ---------------------------------------------------------------------------
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//
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// ---------------------------------------------------------------------------
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TInt32 TSvgPointLexer::GetNextPoint( TChar& aCommand, TFloatFixPt& aX, TFloatFixPt& aY )
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{
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TReal32 realnum = 0.0;
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// Parse X value
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iNegativeNumber = EFalse;
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aCommand = SkipUntilNum();
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if ( iLex.Eos() )
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{
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return -1;
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}
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iLex.Mark();
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if ( SkipToNumEnd() )
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{
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TInt result = TLex( iLex.MarkedToken() ).Val( realnum, '.' ) ;
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if (result != KErrNone)
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{
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realnum= 0.0;
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return result;
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}
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}
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else
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{
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realnum = 0.0;
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}
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if ( iNegativeNumber )
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realnum = -realnum;
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aX = realnum;
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// Parse Y value
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iNegativeNumber = EFalse;
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iLex.Mark();
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SkipUntilNum();
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if ( iLex.Eos() )
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{
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return -1;
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}
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iLex.Mark();
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if ( SkipToNumEnd() )
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{
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TInt result = TLex( iLex.MarkedToken() ).Val( realnum, '.') ;
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if (result != KErrNone)
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{
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realnum= 0.0;
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return result;
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}
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}
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else
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{
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realnum = 0.0; // exponential description
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}
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if ( iNegativeNumber )
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realnum = -realnum;
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aY = realnum;
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return KErrNone;
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}
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//
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// ---------------------------------------------------------------------------
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//
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// ---------------------------------------------------------------------------
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TBool TSvgPointLexer::SkipToNumEnd()
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{
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TChar tmpchar = iLex.Peek();
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TBool tmpbool = ETrue;
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TBool acceptMinus = EFalse;
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while ( tmpchar.IsDigit() ||
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!(tmpchar^46) ||
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( !(tmpchar^45) && acceptMinus ) )
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{
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iLex.Inc();
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tmpchar = iLex.Peek();
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acceptMinus = EFalse;
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if ( !(tmpchar^101) || !(tmpchar^69) )
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{
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// exponential value
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iLex.Inc();
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tmpchar = iLex.Peek();
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tmpbool = EFalse;
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acceptMinus = ETrue;
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}
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}
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return tmpbool;
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}
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//
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// ---------------------------------------------------------------------------
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// TBool TSvgPointLexer::SkipToNumEndWithoutLex(TReal32 &aNum)
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// This function parses the number at the current position into aNum
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// ---------------------------------------------------------------------------
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TBool TSvgPointLexer::SkipToNumEndWithoutLex(TReal32 &aNum)
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{
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TBool numberFound = EFalse;
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TReal32 lNumber=0;
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// Since iData is a TUint16 pointer, and we need to
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// operate with 8bit ASCII, mask LSB to obtain the same
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TUint8 tmpchar = *iData & KLSBMASK;
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TInt fractionPart=0;
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// Scan through the string while the character is
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// between '0' and '9'
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// or is '.'
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// and there are more characters in the string
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while ( (((tmpchar > 47) && (tmpchar < 58) )||
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!(tmpchar^46)) && iData < iDataEnd )
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{
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// If a '.' is not found
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if(tmpchar^46)
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{
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// This means that the char is between '0' and '9'
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numberFound = ETrue;
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// Append it to lNumber
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lNumber = 10*lNumber + (tmpchar -'0');
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if(fractionPart)
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{
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fractionPart++;
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}
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}
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else // '.' is found
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{
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fractionPart++;
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}
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iData++;
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if ( iData < iDataEnd )
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{
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tmpchar = *iData & KLSBMASK;
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// Check if characted is 'e' or 'E'
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// for eg. -3.486e-007
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// This is for floating point representation and is
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// not supported currently. Such numbers are treated
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// as 0.0.
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// The number is skipped.
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if ( (!(tmpchar^101) || !(tmpchar^69)) )
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{
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iData++;
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if ( iData < iDataEnd )
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{
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tmpchar = *iData & KLSBMASK;
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// Check if character is '-', if so
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// skip it
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if( !(tmpchar^45) )
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{
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iData++;
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if ( iData < iDataEnd )
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{
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tmpchar = *iData & KLSBMASK;
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}
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}
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// Skip the numbers and decimal point after 'e'
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while ( ( ( ( tmpchar > 47 ) && ( tmpchar < 58 ) ) ||
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!( tmpchar^46 ) ) && ( iData < iDataEnd ) )
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{
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iData++;
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if ( iData < iDataEnd )
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{
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tmpchar = *iData & KLSBMASK;
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}
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}
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}
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aNum = 0.0;
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return numberFound;
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} // if (exponential number)
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} // if iData < iDataEnd
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} // end while
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// Account for decimal point by performing following calculation
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// lNumber = lNumber / ( 10^ ( fractionPart - 1 ) )
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if(numberFound)
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{
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TInt l=0;
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TInt k=1;
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while(l<(fractionPart-1))
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{
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k=(k*10);
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l++;
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}
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lNumber = (lNumber/k);
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aNum = lNumber;
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}
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return numberFound;
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}
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//
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// ---------------------------------------------------------------------------
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//
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// ---------------------------------------------------------------------------
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TChar TSvgPointLexer::SkipUntilNum()
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{
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TChar ret = '\0';
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iLex.SkipSpace();
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TChar tmpchar = iLex.Peek();
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// skip until finding a digit or '.'
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while ( !( tmpchar.IsDigit() || tmpchar == '.' ) && !iLex.Eos() )
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{
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if ( tmpchar == '-' )
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{
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iNegativeNumber = ETrue;
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}
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else if ( tmpchar == 'Z' || tmpchar == 'z' )
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{
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// if 'Z' or 'z' was found, return imediately.
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iLex.Inc();
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return 'z';
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}
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else if ( tmpchar != ' ' && tmpchar != ',' && tmpchar != '\n' )
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// a better way may be for only selected characters to be recognized and not ignored.
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{
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ret = tmpchar;
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}
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iLex.Inc();
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tmpchar = iLex.Peek();
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}
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return ret;
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}
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//
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// ---------------------------------------------------------------------------
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//
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// ---------------------------------------------------------------------------
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TBool TSvgPointLexer::GetCommand(TUint8 &a)
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{
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a = '\0';
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TUint8 tmpchar;
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while (iData < iDataEnd )
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{
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tmpchar = *iData & KLSBMASK;
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// If character is a not between '0' and '9' and not '.' and '-'
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if (!((tmpchar > 47) && (tmpchar < 58)) && (tmpchar^46) && (tmpchar^45) )
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{
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// Check if character is an alphabet
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if((tmpchar >=65 && tmpchar <= 90) || (tmpchar >=97 && tmpchar <= 122) )
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{
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a = tmpchar;
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iData++;
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return ETrue;
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}
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else
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{
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iData++;
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}
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}
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else
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{
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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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