/* Perform a full-text query; return a list of documents in [pResult]. */
static int fulltext_query(fulltext_vtab *v, const char *zQuery,
DocList **pResult){
Query q;
int phrase_start = -1;
int i;
sqlite3_stmt *pSelect = NULL;
DocList *d = NULL;
int rc = parse_query(v, zQuery, &q);
if( rc!=SQLITE_OK ) return rc;
/* Merge terms. */
for(i = 0 ; i < q.nTerms ; ++i){
/* In each merge step, we need to generate positions whenever we're
* processing a phrase which hasn't ended yet. */
int need_positions = i<q.nTerms-1 && !q.pTerm[i+1].is_phrase;
DocList *next = docListNew(need_positions ? DL_POSITIONS : DL_DOCIDS);
if( q.pTerm[i].is_phrase ){
phrase_start = i;
}
rc = query_merge(v, &pSelect, q.pTerm[i].zTerm, d, i - phrase_start, next);
if( rc!=SQLITE_OK ) break;
if( d!=NULL ){
docListDelete(d);
}
d = next;
}
sqlite3_finalize(pSelect);
query_free(&q);
*pResult = d;
return rc;
}
/* Insert a row into the full-text index; set *piRowid to be the ID of the
* new row. */
static int index_insert(fulltext_vtab *v,
sqlite3_value *pRequestRowid, const char *zText,
sqlite_int64 *piRowid){
Hash terms; /* maps term string -> PosList */
HashElem *e;
int rc = content_insert(v, pRequestRowid, zText, -1);
if( rc!=SQLITE_OK ) return rc;
*piRowid = sqlite3_last_insert_rowid(v->db);
if( !zText ) return SQLITE_OK; /* nothing to index */
rc = build_terms(&terms, v->pTokenizer, zText, *piRowid);
if( rc!=SQLITE_OK ) return rc;
for(e=HashFirst(&terms); e; e=HashNext(e)){
DocList *p = HashData(e);
rc = index_insert_term(v, HashKey(e), HashKeysize(e), *piRowid, p);
if( rc!=SQLITE_OK ) break;
}
for(e=HashFirst(&terms); e; e=HashNext(e)){
DocList *p = HashData(e);
docListDelete(p);
}
HashClear(&terms);
return rc;
}
static int fulltext_query(fulltext_vtab *v, const char *zQuery,
DocList **pResult){
Query q;
int phrase_start = -1;
int i;
sqlite3_stmt *pSelect = NULL;
DocList *d = NULL;
int rc = parse_query(v, zQuery, &q);
if( rc!=SQLITE_OK ) return rc;
for(i = 0 ; i < q.nTerms ; ++i){
int need_positions = i<q.nTerms-1 && !q.pTerm[i+1].is_phrase;
DocList *next = docListNew(need_positions ? DL_POSITIONS : DL_DOCIDS);
if( q.pTerm[i].is_phrase ){
phrase_start = i;
}
rc = query_merge(v, &pSelect, q.pTerm[i].zTerm, d, i - phrase_start, next);
if( rc!=SQLITE_OK ) break;
if( d!=NULL ){
docListDelete(d);
}
d = next;
}
sqlite3_finalize(pSelect);
query_free(&q);
*pResult = d;
return rc;
}
static int fulltextClose(sqlite3_vtab_cursor *pCursor){
fulltext_cursor *c = (fulltext_cursor *) pCursor;
sqlite3_finalize(c->pStmt);
if( c->result.pDoclist!=NULL ){
docListDelete(c->result.pDoclist);
}
free(c);
return SQLITE_OK;
}
/* Delete a row from the full-text index. */
static int index_delete(fulltext_vtab *v, sqlite_int64 iRow){
char *zText;
Hash terms;
HashElem *e;
int rc = content_select(v, iRow, &zText);
if( rc!=SQLITE_OK ) return rc;
rc = build_terms(&terms, v->pTokenizer, zText, iRow);
free(zText);
if( rc!=SQLITE_OK ) return rc;
for(e=HashFirst(&terms); e; e=HashNext(e)){
rc = index_delete_term(v, HashKey(e), HashKeysize(e), iRow);
if( rc!=SQLITE_OK ) break;
}
for(e=HashFirst(&terms); e; e=HashNext(e)){
DocList *p = HashData(e);
docListDelete(p);
}
HashClear(&terms);
return content_delete(v, iRow);
}
