# Label parser

    /*
    **	(c) COPYRIGHT MIT 1996.
    **	Please first read the full copyright statement in the file COPYRIGH.
    */

This module provides the interface to CSLabel.c. Labels are parsed from strings (see CSParse.html). These labels may then be kept in a CSLabel_t structure for inspection by the application or compared to the values in a CSUser_t structure (see CSUser.html).

    #ifndef CSLL_H
    #define CSLL_H

### State Change Enumeration

Call to the TargetChangeCallback will have one of the following values.

    typedef enum {
    	CSLLTC_LIST = 1,
    	CSLLTC_SERVICE,
    	CSLLTC_LABEL,
    	CSLLTC_LABTREE,
    	CSLLTC_SINGLE,
    	CSLLTC_RATING,
    	CSLLTC_RANGE,
    	CSLLTC_AWKWARD,
    	CSLLTC_NORAT,
    	CSLLTC_SRVERR,
    	CSLLTC_LABERR,
    	CSLLTC_EXTEN,
    	CSLLTC_EXTDATA,
    	CSLLTC_COUNT
    } CSLLTC_t;

### Data shell

All PICS label data is stored in a CSLLData_t

    typedef struct CSLLData_s CSLLData_t;
    #define CSLabel_labelNumber(S) (S->currentLabelNumber)

### TargetChangeCallback

As the label is parsed, it will call the assigned TargetChangeCallback as it passes from state to state.

    typedef StateRet_t LabelTargetCallback_t(CSLabel_t * pCSLabel,
    					 CSParse_t * pCSParse,
    					 CSLLTC_t target, BOOL closed,
    					 void * pVoid);

### ErrorHandler

All parsing error will be passed to the Apps LLErrorHandler for user display or automatic dismissal.

    typedef StateRet_t LLErrorHandler_t(CSLabel_t * pCSLabel,
    				    CSParse_t * pCSParse, const char * token,
    				    char demark, StateRet_t errorCode);

### Construction/Destruction

These methods allow the user to create and get access to both the label and the state. CSLabels may be cloned so that one saves state while another continues to iterate or parse. The states mus all be freed. Label data will only be freed after all the CSLabels that refer to it are deleted.

    extern CSParse_t * CSParse_newLabel(
    	                    LabelTargetCallback_t * pLabelTargetCallback,
    			    LLErrorHandler_t * pLLErrorHandler);
    extern BOOL CSParse_deleteLabel(CSParse_t *);
    extern CSLabel_t * CSParse_getLabel(CSParse_t * me);
    extern CSLabel_t * CSLabel_copy(CSLabel_t * old);
    extern void CSLabel_free(CSLabel_t * me);

    extern char * CSLabel_getServiceName(CSLabel_t * pCSLabel);
    extern int CSLabel_getLabelNumber(CSLabel_t * pCSLabel);
    extern char * CSLabel_getRatingName(CSLabel_t * pCSLabel);
    extern char * CSLabel_getRatingStr(CSLabel_t * pCSLabel);
    extern Range_t * CSLabel_getLabelRatingRange(CSLabel_t * pCSLabel);

### Iterating methods

### Callback function

The Iterators are passed a callback function to be called for each matching element. For instance, when iterating through ranges, the callback function is called once for each range, or, if a match is requested, only for the matching range.

    typedef CSError_t CSLabel_callback_t(CSLabel_t *, State_Parms_t *,
    				     const char *, void * pVoid);
    typedef CSError_t CSLabel_iterator_t(CSLabel_t *,
    				     CSLabel_callback_t *,
    				     State_Parms_t *, const char *,
    				     void * pVoid);

### Iterators

    extern CSLabel_iterator_t CSLabel_iterateServices;
    extern CSLabel_iterator_t CSLabel_iterateLabels;
    extern CSLabel_iterator_t CSLabel_iterateSingleLabels;
    extern CSLabel_iterator_t CSLabel_iterateLabelRatings;

### Range Utilities

These funtions allow the application to test the value of a given user parameter against those in the label.

    extern HTList * CSLLData_getAllSingleLabels(CSLabel_t * pCSLabel);
    extern FVal_t CSLabel_ratingsIncludeFVal(CSLabel_t * pCSLabel,
    					   FVal_t * userValue);
    extern FVal_t CSLabel_ratingsIncludeRange(CSLabel_t * pCSLabel,
    					    Range_t * pUserRange);
    extern FVal_t CSLabel_ratingsIncludeRanges(CSLabel_t * pCSLabel,
    					     HTList * userRanges);

    #endif /* CSLL_H */

End of Declaration