postgresql/contrib/tsearch2/tsvector.h

#ifndef __TXTIDX_H__
#define __TXTIDX_H__

/*
#define TXTIDX_DEBUG
*/

#include "postgres.h"

#include "access/gist.h"
#include "access/itup.h"
#include "utils/builtins.h"
#include "storage/bufpage.h"

typedef struct
{
	uint32
				haspos:1,
				len:11,			/* MAX 2Kb */
				pos:20;			/* MAX 1Mb */
}	WordEntry;

#define MAXSTRLEN ( 1<<11 )
#define MAXSTRPOS ( 1<<20 )

typedef struct
{
	uint16
				weight:2,
				pos:14;
}	WordEntryPos;

#define MAXENTRYPOS (1<<14)
#define MAXNUMPOS	256
#define LIMITPOS(x) ( ( (x) >= MAXENTRYPOS ) ? (MAXENTRYPOS-1) : (x) )

typedef struct
{
	int4		len;
	int4		size;
	char		data[1];
}	tsvector;

#define DATAHDRSIZE (sizeof(int4)*2)
#define CALCDATASIZE(x, lenstr) ( x * sizeof(WordEntry) + DATAHDRSIZE + lenstr )
#define ARRPTR(x)	( (WordEntry*) ( (char*)x + DATAHDRSIZE ) )
#define STRPTR(x)	( (char*)x + DATAHDRSIZE + ( sizeof(WordEntry) * ((tsvector*)x)->size ) )
#define STRSIZE(x)	( ((tsvector*)x)->len - DATAHDRSIZE - ( sizeof(WordEntry) * ((tsvector*)x)->size ) )
#define _POSDATAPTR(x,e)	(STRPTR(x)+((WordEntry*)(e))->pos+SHORTALIGN(((WordEntry*)(e))->len))
#define POSDATALEN(x,e) ( ( ((WordEntry*)(e))->haspos ) ? (*(uint16*)_POSDATAPTR(x,e)) : 0 )
#define POSDATAPTR(x,e) ( (WordEntryPos*)( _POSDATAPTR(x,e)+sizeof(uint16) ) )


typedef struct
{
	WordEntry	entry;
	WordEntryPos *pos;
}	WordEntryIN;

typedef struct
{
	char	   *prsbuf;
	char	   *word;
	char	   *curpos;
	int4		len;
	int4		state;
	int4		alen;
	WordEntryPos *pos;
	bool		oprisdelim;
}	TI_IN_STATE;

int4		gettoken_tsvector(TI_IN_STATE * state);

#endif