/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: tkpcont2.hxx,v $
 *
 *  $Revision: 1.3 $
 *
 *  last change: $Author: hr $ $Date: 2006-06-19 12:10:07 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/

#ifndef ADC_TKPCONT2_HXX
#define ADC_TKPCONT2_HXX

// USED SERVICES
    // BASE CLASSES
    // COMPONENTS
    // PARAMETERS
class CharacterSource;
class TkpNullContext;
class TkpNullContex2;

/** @task
    Specifies a context within which tokens are interpreted in a special
    way. For example in parsing C++ there could be a context for code,
    one for comments and a third one for preprocessor statements, because
    each of these would give the same token different meanings.
**/
class TkpContext
{
  public:
    // LIFECYCLE
    virtual                 ~TkpContext() {}

    // OPERATIONS
    /** @descr
        The functions starts to parse with the CurToken() of io_rText.
        It leaves io_rText at the first char of the following Token or
        the following Context.

        This function returns, when a context has parsed some characterss
        and completed a token OR left the context.
        If the token is to be ignored, PassNewToken() returns false
        and cuts the token from io_rText.
        If the token is to be parsed further in a different context,
        PassNewToken() returns false, but the token is
        NOT cut from io_rText.

        If the function has found a valid and complete token, PassNewToken()
        passes the parsed token to the internally known receiver and
        returns true. The token is cut from io_rText.
    **/
    virtual void        ReadCharChain(
                            CharacterSource &   io_rText ) = 0;
    /** Has to pass the parsed token to a known receiver.
        @return true, if a token was passed.
                false, if no token was parsed complete by this context.
    */
    virtual bool        PassNewToken() = 0;
    virtual TkpContext &
                        FollowUpContext() = 0;

    static TkpNullContext &
                        Null_();
};

TkpNullContex2 &    TkpContext_Null2_();

class StateMachineContext
{
  public:
    virtual ~StateMachineContext() {}

    /// Is used by StmBoundsStatu2 only.
    virtual void        PerformStatusFunction(
                            uintt               i_nStatusSignal,
                            UINT16              i_nTokenId,
                            CharacterSource &   io_rText ) = 0;
};

class TkpNullContex2 : public TkpContext
{
  public:
                        ~TkpNullContex2();

    virtual void        ReadCharChain(
                            CharacterSource &   io_rText );
    virtual bool        PassNewToken();
    virtual TkpContext &
                        FollowUpContext();
};

class TkpDocuContext : public TkpContext
{
  public:
    virtual void        SetParentContext(
                            TkpContext &        io_rParentContext,
                            const char *        i_sMultiLineEndToken ) = 0;
    virtual void        SetMode_IsMultiLine(
                            bool                i_bTrue ) = 0;
};



#endif