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Text parser rewritten:

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- 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'
This commit is contained in:
Teodor Sigaev
2005-11-21 12:27:57 +00:00
parent b91e6ed93e
commit c52795d18a
15 changed files with 1613 additions and 424 deletions
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111
contrib/tsearch2/query_support.c
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@@ -14,6 +14,117 @@ tsquery_numnode(PG_FUNCTION_ARGS) {
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 ) {