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ts_cache.h
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ts_locale.h
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ts_public.h
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ts_type.h
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ts_utils.h
(11.18 KB)
Editing: ts_utils.h
/*------------------------------------------------------------------------- * * ts_utils.h * helper utilities for tsearch * * Copyright (c) 1998-2016, PostgreSQL Global Development Group * * src/include/tsearch/ts_utils.h * *------------------------------------------------------------------------- */ #ifndef _PG_TS_UTILS_H_ #define _PG_TS_UTILS_H_ #include "nodes/pg_list.h" #include "tsearch/ts_public.h" #include "tsearch/ts_type.h" /* * Common parse definitions for tsvector and tsquery */ /* tsvector parser support. */ struct TSVectorParseStateData; /* opaque struct in tsvector_parser.c */ typedef struct TSVectorParseStateData *TSVectorParseState; extern TSVectorParseState init_tsvector_parser(char *input, bool oprisdelim, bool is_tsquery); extern void reset_tsvector_parser(TSVectorParseState state, char *input); extern bool gettoken_tsvector(TSVectorParseState state, char **token, int *len, WordEntryPos **pos, int *poslen, char **endptr); extern void close_tsvector_parser(TSVectorParseState state); /* parse_tsquery */ struct TSQueryParserStateData; /* private in backend/utils/adt/tsquery.c */ typedef struct TSQueryParserStateData *TSQueryParserState; typedef void (*PushFunction) (Datum opaque, TSQueryParserState state, char *token, int tokenlen, int16 tokenweights, /* bitmap as described * in QueryOperand * struct */ bool prefix); extern TSQuery parse_tsquery(char *buf, PushFunction pushval, Datum opaque, bool isplain); /* Functions for use by PushFunction implementations */ extern void pushValue(TSQueryParserState state, char *strval, int lenval, int16 weight, bool prefix); extern void pushStop(TSQueryParserState state); extern void pushOperator(TSQueryParserState state, int8 oper, int16 distance); /* * parse plain text and lexize words */ typedef struct { uint16 len; uint16 nvariant; union { uint16 pos; /* * When apos array is used, apos[0] is the number of elements in the * array (excluding apos[0]), and alen is the allocated size of the * array. */ uint16 *apos; } pos; uint16 flags; /* currently, only TSL_PREFIX */ char *word; uint32 alen; } ParsedWord; typedef struct { ParsedWord *words; int32 lenwords; int32 curwords; int32 pos; } ParsedText; extern void parsetext(Oid cfgId, ParsedText *prs, char *buf, int32 buflen); /* * headline framework, flow in common to generate: * 1 parse text with hlparsetext * 2 parser-specific function to find part * 3 generateHeadline to generate result text */ extern void hlparsetext(Oid cfgId, HeadlineParsedText *prs, TSQuery query, char *buf, int32 buflen); extern text *generateHeadline(HeadlineParsedText *prs); /* * TSQuery execution support * * TS_execute() executes a tsquery against data that can be represented in * various forms. The TSExecuteCallback callback function is called to check * whether a given primitive tsquery value is matched in the data. */ /* * struct ExecPhraseData is passed to a TSExecuteCallback function if we need * lexeme position data (because of a phrase-match operator in the tsquery). * The callback should fill in position data when it returns true (success). * If it cannot return position data, it may leave "data" unchanged, but * then the caller of TS_execute() must pass the TS_EXEC_PHRASE_NO_POS flag * and must arrange for a later recheck with position data available. * * The reported lexeme positions must be sorted and unique. Callers must only * consult the position bits of the pos array, ie, WEP_GETPOS(data->pos[i]). * This allows the returned "pos" to point directly to the WordEntryPos * portion of a tsvector value. If "allocated" is true then the pos array * is palloc'd workspace and caller may free it when done. * * "negate" means that the pos array contains positions where the query does * not match, rather than positions where it does. "width" is positive when * the match is wider than one lexeme. Neither of these fields normally need * to be touched by TSExecuteCallback functions; they are used for * phrase-search processing within TS_execute. * * All fields of the ExecPhraseData struct are initially zeroed by caller. */ typedef struct ExecPhraseData { int npos; /* number of positions reported */ bool allocated; /* pos points to palloc'd data? */ bool negate; /* positions are where query is NOT matched */ WordEntryPos *pos; /* ordered, non-duplicate lexeme positions */ int width; /* width of match in lexemes, less 1 */ } ExecPhraseData; /* * Signature for TSQuery lexeme check functions * * arg: opaque value passed through from caller of TS_execute * val: lexeme to test for presence of * data: to be filled with lexeme positions; NULL if position data not needed * * Return TRUE if lexeme is present in data, else FALSE. If data is not * NULL, it should be filled with lexeme positions, but function can leave * it as zeroes if position data is not available. */ typedef bool (*TSExecuteCallback) (void *arg, QueryOperand *val, ExecPhraseData *data); /* * Flag bits for TS_execute */ #define TS_EXEC_EMPTY (0x00) /* * If TS_EXEC_CALC_NOT is not set, then NOT expressions are automatically * evaluated to be true. Useful in cases where NOT cannot be accurately * computed (GiST) or it isn't important (ranking). From TS_execute's * perspective, !CALC_NOT means that the TSExecuteCallback function might * return false-positive indications of a lexeme's presence. */ #define TS_EXEC_CALC_NOT (0x01) /* * If TS_EXEC_PHRASE_NO_POS is set, allow OP_PHRASE to be executed lossily * in the absence of position information: a TRUE result indicates that the * phrase might be present. Without this flag, OP_PHRASE always returns * false if lexeme position information is not available. */ #define TS_EXEC_PHRASE_NO_POS (0x02) /* Obsolete spelling of TS_EXEC_PHRASE_NO_POS: */ #define TS_EXEC_PHRASE_AS_AND TS_EXEC_PHRASE_NO_POS extern bool TS_execute(QueryItem *curitem, void *arg, uint32 flags, TSExecuteCallback chkcond); extern bool tsquery_requires_match(QueryItem *curitem); /* * to_ts* - text transformation to tsvector, tsquery */ extern TSVector make_tsvector(ParsedText *prs); extern int32 tsCompareString(char *a, int lena, char *b, int lenb, bool prefix); extern Datum to_tsvector_byid(PG_FUNCTION_ARGS); extern Datum to_tsvector(PG_FUNCTION_ARGS); extern Datum to_tsquery_byid(PG_FUNCTION_ARGS); extern Datum to_tsquery(PG_FUNCTION_ARGS); extern Datum plainto_tsquery_byid(PG_FUNCTION_ARGS); extern Datum plainto_tsquery(PG_FUNCTION_ARGS); extern Datum phraseto_tsquery_byid(PG_FUNCTION_ARGS); extern Datum phraseto_tsquery(PG_FUNCTION_ARGS); /* * GiST support function */ extern Datum gtsvector_compress(PG_FUNCTION_ARGS); extern Datum gtsvector_decompress(PG_FUNCTION_ARGS); extern Datum gtsvector_consistent(PG_FUNCTION_ARGS); extern Datum gtsvector_union(PG_FUNCTION_ARGS); extern Datum gtsvector_same(PG_FUNCTION_ARGS); extern Datum gtsvector_penalty(PG_FUNCTION_ARGS); extern Datum gtsvector_picksplit(PG_FUNCTION_ARGS); extern Datum gtsvector_consistent_oldsig(PG_FUNCTION_ARGS); /* * IO functions for pseudotype gtsvector * used internally in tsvector GiST opclass */ extern Datum gtsvectorin(PG_FUNCTION_ARGS); extern Datum gtsvectorout(PG_FUNCTION_ARGS); /* * GIN support function */ extern Datum gin_extract_tsvector(PG_FUNCTION_ARGS); extern Datum gin_cmp_tslexeme(PG_FUNCTION_ARGS); extern Datum gin_cmp_prefix(PG_FUNCTION_ARGS); extern Datum gin_extract_tsquery(PG_FUNCTION_ARGS); extern Datum gin_tsquery_consistent(PG_FUNCTION_ARGS); extern Datum gin_tsquery_triconsistent(PG_FUNCTION_ARGS); extern Datum gin_extract_tsvector_2args(PG_FUNCTION_ARGS); extern Datum gin_extract_tsquery_5args(PG_FUNCTION_ARGS); extern Datum gin_tsquery_consistent_6args(PG_FUNCTION_ARGS); extern Datum gin_extract_tsquery_oldsig(PG_FUNCTION_ARGS); extern Datum gin_tsquery_consistent_oldsig(PG_FUNCTION_ARGS); /* * Possible strategy numbers for indexes * TSearchStrategyNumber - (tsvector|text) @@ tsquery * TSearchWithClassStrategyNumber - tsvector @@@ tsquery */ #define TSearchStrategyNumber 1 #define TSearchWithClassStrategyNumber 2 /* * TSQuery Utilities */ extern QueryItem *clean_NOT(QueryItem *ptr, int32 *len); extern TSQuery cleanup_tsquery_stopwords(TSQuery in); typedef struct QTNode { QueryItem *valnode; uint32 flags; int32 nchild; char *word; uint32 sign; struct QTNode **child; } QTNode; /* bits in QTNode.flags */ #define QTN_NEEDFREE 0x01 #define QTN_NOCHANGE 0x02 #define QTN_WORDFREE 0x04 typedef uint64 TSQuerySign; #define TSQS_SIGLEN (sizeof(TSQuerySign)*BITS_PER_BYTE) #define TSQuerySignGetDatum(X) Int64GetDatum((int64) (X)) #define DatumGetTSQuerySign(X) ((TSQuerySign) DatumGetInt64(X)) #define PG_RETURN_TSQUERYSIGN(X) return TSQuerySignGetDatum(X) #define PG_GETARG_TSQUERYSIGN(n) DatumGetTSQuerySign(PG_GETARG_DATUM(n)) extern QTNode *QT2QTN(QueryItem *in, char *operand); extern TSQuery QTN2QT(QTNode *in); extern void QTNFree(QTNode *in); extern void QTNSort(QTNode *in); extern void QTNTernary(QTNode *in); extern void QTNBinary(QTNode *in); extern int QTNodeCompare(QTNode *an, QTNode *bn); extern QTNode *QTNCopy(QTNode *in); extern void QTNClearFlags(QTNode *in, uint32 flags); extern bool QTNEq(QTNode *a, QTNode *b); extern TSQuerySign makeTSQuerySign(TSQuery a); extern QTNode *findsubquery(QTNode *root, QTNode *ex, QTNode *subs, bool *isfind); /* * TSQuery GiST support */ extern Datum gtsquery_compress(PG_FUNCTION_ARGS); extern Datum gtsquery_decompress(PG_FUNCTION_ARGS); extern Datum gtsquery_consistent(PG_FUNCTION_ARGS); extern Datum gtsquery_union(PG_FUNCTION_ARGS); extern Datum gtsquery_same(PG_FUNCTION_ARGS); extern Datum gtsquery_penalty(PG_FUNCTION_ARGS); extern Datum gtsquery_picksplit(PG_FUNCTION_ARGS); extern Datum gtsquery_consistent_oldsig(PG_FUNCTION_ARGS); /* * Parser interface to SQL */ extern Datum ts_token_type_byid(PG_FUNCTION_ARGS); extern Datum ts_token_type_byname(PG_FUNCTION_ARGS); extern Datum ts_parse_byid(PG_FUNCTION_ARGS); extern Datum ts_parse_byname(PG_FUNCTION_ARGS); /* * Default word parser */ extern Datum prsd_start(PG_FUNCTION_ARGS); extern Datum prsd_nexttoken(PG_FUNCTION_ARGS); extern Datum prsd_end(PG_FUNCTION_ARGS); extern Datum prsd_headline(PG_FUNCTION_ARGS); extern Datum prsd_lextype(PG_FUNCTION_ARGS); /* * Dictionary interface to SQL */ extern Datum ts_lexize(PG_FUNCTION_ARGS); /* * Simple built-in dictionary */ extern Datum dsimple_init(PG_FUNCTION_ARGS); extern Datum dsimple_lexize(PG_FUNCTION_ARGS); /* * Synonym built-in dictionary */ extern Datum dsynonym_init(PG_FUNCTION_ARGS); extern Datum dsynonym_lexize(PG_FUNCTION_ARGS); /* * ISpell dictionary */ extern Datum dispell_init(PG_FUNCTION_ARGS); extern Datum dispell_lexize(PG_FUNCTION_ARGS); /* * Thesaurus */ extern Datum thesaurus_init(PG_FUNCTION_ARGS); extern Datum thesaurus_lexize(PG_FUNCTION_ARGS); /* * headline */ extern Datum ts_headline_byid_opt(PG_FUNCTION_ARGS); extern Datum ts_headline_byid(PG_FUNCTION_ARGS); extern Datum ts_headline(PG_FUNCTION_ARGS); extern Datum ts_headline_opt(PG_FUNCTION_ARGS); /* * current cfg */ extern Datum get_current_ts_config(PG_FUNCTION_ARGS); #endif /* _PG_TS_UTILS_H_ */
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