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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
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#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