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27 
28 #ifndef ADC_TKP2_HXX
29 #define ADC_TKP2_HXX
30 
31 // USED SERVICES
32 	// BASE CLASSES
33 	// COMPONENTS
34 class CharacterSource;
35 class TkpContext;
36 	// PARAMETRS
37 
38 
39 
40 /** This is the interface for parser classes, which get a sequence of Token s from
41 	a text.
42 
43 	Start() starts to parse the text from the given i_rSource.
44 	GetNextToken() returns a Token on the heap as long as there are
45 	still characters in the text left. The last time GetNextToken()
46 	returns NULL.
47 
48 	The algorithms for parsing tokens from the text are an issue of
49 	the derived classes.
50 */
51 class TokenParse2
52 {
53   public:
54 	// LIFECYCLE
55 						TokenParse2();
56 	virtual				~TokenParse2() {}
57 
58 	// OPERATIONS
59 	virtual void   		Start(
60 							CharacterSource &
61 											i_rSource );
62 
63 	/** @short	Gets the next identifiable token out of the
64 		source code.
65 		@return true, if there was passed a valid token.
66 				false, if the parsed stream is finished or
67                 	   an error occured.
68 	*/
69 	bool				GetNextToken();
70 
71   private:
72 	virtual void		SetStartContext() = 0;
73 	virtual void        SetCurrentContext(
74 							TkpContext &		io_rContext ) = 0;
75 	virtual TkpContext &
76 						CurrentContext() = 0;
77 	// DATA
78 	CharacterSource *	pChars;
79 };
80 
81 
82 #endif
83 
84 
85