170 lines
5.1 KiB
C++
170 lines
5.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#ifndef ADC_TKPCHARS_HXX
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#define ADC_TKPCHARS_HXX
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// USED SERVICES
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// BASE CLASSES
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// COMPONENTS
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// PARAMETRS
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#include <adc_cl.hxx>
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#include <stack>
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/** @descr
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dpSource:
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1||||||||||||||||||||||a||||||||||||b|||c||||||||||||||||||||...
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1 := first character of Sourcecode.
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a := nLastTokenStart, there starts the last cut token.
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b := nLastCut, there is a '\0'-char which marks the end of
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the last cut token. The original character at b is stored
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in cCharAtLastCut and will replace the '\0'-char, when the
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next token is cut.
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c := The current cursor position.
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@needs cosv.lib
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@use This class can be used by any parser to get the chars of a
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text one by one and separate them to tokens.
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**/
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class CharacterSource
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{
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public:
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// LIFECYCLE
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CharacterSource();
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~CharacterSource();
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// OPERATIONS
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/** Loads the complete contents of in_rSource into the classes private memory.
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If in_rSource is a file, it has to be open of course.
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After loading the text, the CurChar() is set on the begin of the text.
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**/
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void LoadText(
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csv::bstream & io_rSource);
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/// @return CurChar() after moving forward one char.
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char MoveOn();
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/** @return
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The token which starts at the char which was CurChar(), when
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CutToken() was called the last time - or at the beginning of the text.
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The token ends by the CurChar() being replaced by a '\0'.
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Value is valid until the next call of CutToken() or ~CharacterSource().
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**/
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const char * CutToken();
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// INQUIRY
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char CurChar() const;
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/// @return The result of the last CutToken(). Or NULL, if there was none yet.
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const char * CurToken() const;
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// INQUIRY
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/// @return true, if
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bool IsFinished() const;
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private:
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struct S_SourceState
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{
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DYN char * dpSource;
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intt nSourceSize;
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intt nCurPos;
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intt nLastCut;
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intt nLastTokenStart;
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char cCharAtLastCut;
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S_SourceState(
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DYN char * dpSource,
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intt nSourceSize,
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intt nCurPos,
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intt nLastCut,
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intt nLastTokenStart,
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char cCharAtLastCut );
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};
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void BeginSource();
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intt CurPos() const;
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char MoveOn_OverStack();
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// DATA
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std::stack< S_SourceState >
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aSourcesStack;
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DYN char * dpSource;
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intt nSourceSize;
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intt nCurPos;
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intt nLastCut;
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intt nLastTokenStart;
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char cCharAtLastCut;
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};
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inline char
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CharacterSource::MoveOn()
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{
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if (DEBUG_ShowText())
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{
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Cerr() << char(dpSource[nCurPos+1]) << Flush();
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}
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if ( nCurPos < nSourceSize-1 )
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return dpSource[++nCurPos];
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else if ( aSourcesStack.size() > 0 )
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return MoveOn_OverStack();
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else
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return dpSource[nCurPos = nSourceSize];
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}
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inline char
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CharacterSource::CurChar() const
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{ return nCurPos != nLastCut ? dpSource[nCurPos] : cCharAtLastCut; }
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inline const char *
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CharacterSource::CurToken() const
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{ return &dpSource[nLastTokenStart]; }
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inline bool
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CharacterSource::IsFinished() const
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{ return nCurPos >= nSourceSize; }
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inline intt
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CharacterSource::CurPos() const
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{ return nCurPos; }
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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