postgresql/contrib/tsearch2/query_support.c
Teodor Sigaev c52795d18a Text parser rewritten:
- supports multibyte encodings
        - more strict rules for lexemes
        - flex isn't used
Add:
        - tsquery plainto_tsquery(text)
          Function makes tsquery from plain text.
        - &&, ||, !! operation for tsquery for combining
          tsquery from it's parts:  'foo & bar' || 'asd' => 'foo & bar | asd'
2005-11-21 12:27:57 +00:00

188 lines
4.4 KiB
C

#include "postgres.h"
#include "fmgr.h"
#include "query_util.h"
PG_FUNCTION_INFO_V1(tsquery_numnode);
Datum tsquery_numnode(PG_FUNCTION_ARGS);
Datum
tsquery_numnode(PG_FUNCTION_ARGS) {
QUERYTYPE *query = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
int nnode = query->size;
PG_FREE_IF_COPY(query,0);
PG_RETURN_INT32(nnode);
}
static QTNode*
join_tsqueries(QUERYTYPE *a, QUERYTYPE *b) {
QTNode *res=(QTNode*)palloc0( sizeof(QTNode) );
res->flags |= QTN_NEEDFREE;
res->valnode = (ITEM*)palloc0( sizeof(ITEM) );
res->valnode->type = OPR;
res->child = (QTNode**)palloc0( sizeof(QTNode*)*2 );
res->child[0] = QT2QTN( GETQUERY(b), GETOPERAND(b) );
res->child[1] = QT2QTN( GETQUERY(a), GETOPERAND(a) );
res->nchild = 2;
return res;
}
PG_FUNCTION_INFO_V1(tsquery_and);
Datum tsquery_and(PG_FUNCTION_ARGS);
Datum
tsquery_and(PG_FUNCTION_ARGS) {
QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
QTNode *res;
QUERYTYPE *query;
if ( a->size == 0 ) {
PG_FREE_IF_COPY(a,1);
PG_RETURN_POINTER(b);
} else if ( b->size == 0 ) {
PG_FREE_IF_COPY(b,1);
PG_RETURN_POINTER(a);
}
res = join_tsqueries(a, b);
res->valnode->val = '&';
query = QTN2QT( res, PlainMemory );
QTNFree(res);
PG_FREE_IF_COPY(a,0);
PG_FREE_IF_COPY(b,1);
PG_RETURN_POINTER(query);
}
PG_FUNCTION_INFO_V1(tsquery_or);
Datum tsquery_or(PG_FUNCTION_ARGS);
Datum
tsquery_or(PG_FUNCTION_ARGS) {
QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
QTNode *res;
QUERYTYPE *query;
if ( a->size == 0 ) {
PG_FREE_IF_COPY(a,1);
PG_RETURN_POINTER(b);
} else if ( b->size == 0 ) {
PG_FREE_IF_COPY(b,1);
PG_RETURN_POINTER(a);
}
res = join_tsqueries(a, b);
res->valnode->val = '|';
query = QTN2QT( res, PlainMemory );
QTNFree(res);
PG_FREE_IF_COPY(a,0);
PG_FREE_IF_COPY(b,1);
PG_RETURN_POINTER(query);
}
PG_FUNCTION_INFO_V1(tsquery_not);
Datum tsquery_not(PG_FUNCTION_ARGS);
Datum
tsquery_not(PG_FUNCTION_ARGS) {
QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
QTNode *res;
QUERYTYPE *query;
if ( a->size == 0 )
PG_RETURN_POINTER(a);
res=(QTNode*)palloc0( sizeof(QTNode) );
res->flags |= QTN_NEEDFREE;
res->valnode = (ITEM*)palloc0( sizeof(ITEM) );
res->valnode->type = OPR;
res->valnode->val = '!';
res->child = (QTNode**)palloc0( sizeof(QTNode*) );
res->child[0] = QT2QTN( GETQUERY(a), GETOPERAND(a) );
res->nchild = 1;
query = QTN2QT( res, PlainMemory );
QTNFree(res);
PG_FREE_IF_COPY(a,0);
PG_RETURN_POINTER(query);
}
static int
CompareTSQ( QUERYTYPE *a, QUERYTYPE *b ) {
if ( a->size != b->size ) {
return ( a->size < b->size ) ? -1 : 1;
} else if ( a->len != b->len ) {
return ( a->len < b->len ) ? -1 : 1;
} else {
QTNode *an = QT2QTN( GETQUERY(a), GETOPERAND(a) );
QTNode *bn = QT2QTN( GETQUERY(b), GETOPERAND(b) );
int res = QTNodeCompare(an, bn);
QTNFree(an);
QTNFree(bn);
return res;
}
return 0;
}
PG_FUNCTION_INFO_V1(tsquery_cmp); \
Datum tsquery_cmp(PG_FUNCTION_ARGS);
Datum
tsquery_cmp(PG_FUNCTION_ARGS) {
QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0)));
QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1)));
int res = CompareTSQ(a,b);
PG_FREE_IF_COPY(a,0);
PG_FREE_IF_COPY(b,1);
PG_RETURN_INT32(res);
}
#define CMPFUNC( NAME, ACTION ) \
PG_FUNCTION_INFO_V1(NAME); \
Datum NAME(PG_FUNCTION_ARGS); \
\
Datum \
NAME(PG_FUNCTION_ARGS) { \
QUERYTYPE *a = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0))); \
QUERYTYPE *b = (QUERYTYPE *) DatumGetPointer(PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(1))); \
int res = CompareTSQ(a,b); \
\
PG_FREE_IF_COPY(a,0); \
PG_FREE_IF_COPY(b,1); \
\
PG_RETURN_BOOL( ACTION ); \
}
CMPFUNC( tsquery_lt, res <0 );
CMPFUNC( tsquery_le, res<=0 );
CMPFUNC( tsquery_eq, res==0 );
CMPFUNC( tsquery_ge, res>=0 );
CMPFUNC( tsquery_gt, res >0 );
CMPFUNC( tsquery_ne, res!=0 );