author | Jussi Ryoma <ext-jussi.s.ryoma@nokia.com> |
Fri, 27 Aug 2010 12:21:46 +0300 | |
changeset 3 | 045ade241ef5 |
parent 0 | 818e61de6cd1 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2004-2008 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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|
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using System; |
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using System.IO; |
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using System.Text; |
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using System.Collections; |
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using System.Diagnostics; |
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|
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namespace SymBuildParsingLib |
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{ |
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#region Exceptions |
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public class SymParserStreamExceptionInvalidRewindAmount : Exception |
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{ |
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public SymParserStreamExceptionInvalidRewindAmount( string aMessage ) |
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: base( aMessage ) |
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{ |
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} |
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} |
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#endregion |
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|
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public class SymStream |
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{ |
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#region Constructors & destructor |
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public SymStream( string aFileName ) |
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{ |
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iFileName = aFileName; |
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iFileStream = new FileStream( aFileName, System.IO.FileMode.Open ); |
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iStream = new StreamReader( iFileStream ); |
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iFileData = new Stack( 1024 * 20 ); |
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} |
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#endregion |
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|
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#region API |
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public char PeekChar() |
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{ |
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Debug.Assert( !EOF ); |
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// |
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char ret = (char) iStream.Peek(); |
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// |
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if ( iPushedBackCharacters.Count > 0 ) |
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{ |
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ret = (char) iPushedBackCharacters.Peek(); |
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} |
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return ret; |
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} |
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|
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public char ReadChar() |
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{ |
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Debug.Assert( !EOF ); |
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// |
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char ret; |
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// |
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if ( iPushedBackCharacters.Count > 0 ) |
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{ |
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ret = (char) iPushedBackCharacters.Pop(); |
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} |
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else |
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{ |
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ret = (char) iStream.Read(); |
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} |
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// |
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iFileData.Push( ret ); |
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++iPosition; |
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// |
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return ret; |
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} |
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|
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public void RewindChar() |
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{ |
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RewindChars( 1 ); |
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} |
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|
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public void RewindChars( int aRewindCount ) |
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{ |
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long newPos = Position - aRewindCount; |
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if ( aRewindCount < 0 ) |
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throw new SymParserStreamExceptionInvalidRewindAmount( "Rewind specifier must be >= 0" ); |
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else if ( newPos < 0 || newPos >= Size ) |
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throw new SymParserStreamExceptionInvalidRewindAmount( "Rewind specifier takes stream position beyond scope of file" ); |
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for( int i=0; i<aRewindCount; i++ ) |
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{ |
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char character = (char) iFileData.Pop(); |
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iPushedBackCharacters.Push( character ); |
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} |
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iPosition -= aRewindCount; |
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} |
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#endregion |
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#region Properties |
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public string FileName |
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{ |
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get { return iFileName; } |
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} |
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public long Position |
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{ |
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get { return iPosition; } |
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} |
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public long Size |
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{ |
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get { return iStream.BaseStream.Length; } |
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} |
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public bool EOF |
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{ |
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get |
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125 |
{ |
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long fileSize = Size; |
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bool atEnd = ( Position >= fileSize ); |
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return atEnd; |
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} |
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} |
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131 |
#endregion |
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132 |
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133 |
#region Constants |
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private const int KStreamEOF = -1; |
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#endregion |
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136 |
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#region Data members |
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private readonly string iFileName; |
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private StreamReader iStream; |
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private FileStream iFileStream; |
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private Stack iPushedBackCharacters = new Stack( 1024 ); |
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private Stack iFileData; |
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private long iPosition; |
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144 |
#endregion |
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} |
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} |