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/*-------------------------------------------------------------------------
*
* ts_public.h
* Public interface to various tsearch modules, such as
* parsers and dictionaries.
*
* Copyright (c) 1998-2021, PostgreSQL Global Development Group
*
* src/include/tsearch/ts_public.h
*
*-------------------------------------------------------------------------
*/
#ifndef _PG_TS_PUBLIC_H_
#define _PG_TS_PUBLIC_H_
#include "tsearch/ts_type.h"
/*
* Parser's framework
*/
/*
* returning type for prslextype method of parser
*/
typedef struct
{
int lexid;
char *alias;
char *descr;
} LexDescr;
/*
* Interface to headline generator
*/
typedef struct
{
uint32 selected:1,
in:1,
replace:1,
repeated:1,
skip:1,
unused:3,
type:8,
len:16;
WordEntryPos pos;
char *word;
QueryOperand *item;
} HeadlineWordEntry;
typedef struct
{
HeadlineWordEntry *words;
int32 lenwords;
int32 curwords;
int32 vectorpos; /* positions a-la tsvector */
char *startsel;
char *stopsel;
char *fragdelim;
int16 startsellen;
int16 stopsellen;
int16 fragdelimlen;
} HeadlineParsedText;
/*
* Common useful things for tsearch subsystem
*/
extern char *get_tsearch_config_filename(const char *basename,
const char *extension);
/*
* Often useful stopword list management
*/
typedef struct
{
int len;
char **stop;
} StopList;
extern void readstoplist(const char *fname, StopList *s,
char *(*wordop) (const char *));
extern bool searchstoplist(StopList *s, char *key);
/*
* Interface with dictionaries
*/
/* return struct for any lexize function */
typedef struct
{
/*----------
* Number of current variant of split word. For example the Norwegian
* word 'fotballklubber' has two variants to split: ( fotball, klubb )
* and ( fot, ball, klubb ). So, dictionary should return:
*
* nvariant lexeme
* 1 fotball
* 1 klubb
* 2 fot
* 2 ball
* 2 klubb
*
* In general, a TSLexeme will be considered to belong to the same split
* variant as the previous one if they have the same nvariant value.
* The exact values don't matter, only changes from one lexeme to next.
*----------
*/
uint16 nvariant;
uint16 flags; /* See flag bits below */
char *lexeme; /* C string */
} TSLexeme;
/* Flag bits that can appear in TSLexeme.flags */
#define TSL_ADDPOS 0x01
#define TSL_PREFIX 0x02
#define TSL_FILTER 0x04
/*
* Struct for supporting complex dictionaries like thesaurus.
* 4th argument for dictlexize method is a pointer to this
*/
typedef struct
{
bool isend; /* in: marks for lexize_info about text end is
* reached */
bool getnext; /* out: dict wants next lexeme */
void *private_state; /* internal dict state between calls with
* getnext == true */
} DictSubState;
#endif /* _PG_TS_PUBLIC_H_ */
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