void
Indexer_delete_by_term(Indexer *self, CharBuf *field, Obj *term)
{
Schema *schema = self->schema;
FieldType *type = Schema_Fetch_Type(schema, field);
// Raise exception if the field isn't indexed.
if (!type || !FType_Indexed(type))
THROW(ERR, "%o is not an indexed field", field);
// Analyze term if appropriate, then zap.
if (FType_Is_A(type, FULLTEXTTYPE)) {
CERTIFY(term, CHARBUF);
{
Analyzer *analyzer = Schema_Fetch_Analyzer(schema, field);
VArray *terms = Analyzer_Split(analyzer, (CharBuf*)term);
Obj *analyzed_term = VA_Fetch(terms, 0);
if (analyzed_term) {
DelWriter_Delete_By_Term(self->del_writer, field,
analyzed_term);
}
DECREF(terms);
}
}
else {
DelWriter_Delete_By_Term(self->del_writer, field, term);
}
}
void
Indexer_Delete_By_Term_IMP(Indexer *self, String *field, Obj *term) {
IndexerIVARS *const ivars = Indexer_IVARS(self);
Schema *schema = ivars->schema;
FieldType *type = Schema_Fetch_Type(schema, field);
// Raise exception if the field isn't indexed.
if (!type || !FType_Indexed(type)) {
THROW(ERR, "%o is not an indexed field", field);
}
// Analyze term if appropriate, then zap.
if (FType_is_a(type, FULLTEXTTYPE)) {
CERTIFY(term, STRING);
Analyzer *analyzer = Schema_Fetch_Analyzer(schema, field);
Vector *terms = Analyzer_Split(analyzer, (String*)term);
Obj *analyzed_term = Vec_Fetch(terms, 0);
if (analyzed_term) {
DelWriter_Delete_By_Term(ivars->del_writer, field,
analyzed_term);
}
DECREF(terms);
}
else {
DelWriter_Delete_By_Term(ivars->del_writer, field, term);
}
}
Query*
QParser_Expand_Leaf_IMP(QueryParser *self, Query *query) {
QueryParserIVARS *const ivars = QParser_IVARS(self);
LeafQuery *leaf_query = (LeafQuery*)query;
Schema *schema = ivars->schema;
bool is_phrase = false;
bool ambiguous = false;
// Determine whether we can actually process the input.
if (!Query_is_a(query, LEAFQUERY)) { return NULL; }
String *full_text = LeafQuery_Get_Text(leaf_query);
if (!Str_Get_Size(full_text)) { return NULL; }
// If quoted, always generate PhraseQuery.
StringIterator *top = Str_Top(full_text);
StringIterator *tail = Str_Tail(full_text);
StrIter_Skip_Next_Whitespace(top);
StrIter_Skip_Prev_Whitespace(tail);
if (StrIter_Starts_With_Utf8(top, "\"", 1)) {
is_phrase = true;
StrIter_Advance(top, 1);
if (StrIter_Ends_With_Utf8(tail, "\"", 1)
&& !StrIter_Ends_With_Utf8(tail, "\\\"", 2)
) {
StrIter_Recede(tail, 1);
}
}
String *source_text = StrIter_substring(top, tail);
// Either use LeafQuery's field or default to Parser's list.
Vector *fields;
if (LeafQuery_Get_Field(leaf_query)) {
fields = Vec_new(1);
Vec_Push(fields, INCREF(LeafQuery_Get_Field(leaf_query)));
}
else {
fields = (Vector*)INCREF(ivars->fields);
}
CharBuf *unescape_buf = CB_new(Str_Get_Size(source_text));
Vector *queries = Vec_new(Vec_Get_Size(fields));
for (uint32_t i = 0, max = Vec_Get_Size(fields); i < max; i++) {
String *field = (String*)Vec_Fetch(fields, i);
Analyzer *analyzer = ivars->analyzer
? ivars->analyzer
: Schema_Fetch_Analyzer(schema, field);
if (!analyzer) {
Vec_Push(queries,
(Obj*)QParser_Make_Term_Query(self, field,
(Obj*)source_text));
}
else {
// Extract token texts.
String *split_source = S_unescape(self, source_text, unescape_buf);
Vector *maybe_texts = Analyzer_Split(analyzer, split_source);
uint32_t num_maybe_texts = Vec_Get_Size(maybe_texts);
Vector *token_texts = Vec_new(num_maybe_texts);
// Filter out zero-length token texts.
for (uint32_t j = 0; j < num_maybe_texts; j++) {
String *token_text = (String*)Vec_Fetch(maybe_texts, j);
if (Str_Get_Size(token_text)) {
Vec_Push(token_texts, INCREF(token_text));
}
}
if (Vec_Get_Size(token_texts) == 0) {
/* Query might include stop words. Who knows? */
ambiguous = true;
}
// Add either a TermQuery or a PhraseQuery.
if (is_phrase || Vec_Get_Size(token_texts) > 1) {
Vec_Push(queries, (Obj*)
QParser_Make_Phrase_Query(self, field, token_texts));
}
else if (Vec_Get_Size(token_texts) == 1) {
Vec_Push(queries,
(Obj*)QParser_Make_Term_Query(self, field, Vec_Fetch(token_texts, 0)));
}
DECREF(token_texts);
DECREF(maybe_texts);
DECREF(split_source);
}
}
Query *retval;
if (Vec_Get_Size(queries) == 0) {
retval = (Query*)NoMatchQuery_new();
if (ambiguous) {
NoMatchQuery_Set_Fails_To_Match((NoMatchQuery*)retval, false);
}
}
else if (Vec_Get_Size(queries) == 1) {
retval = (Query*)INCREF(Vec_Fetch(queries, 0));
}
else {
retval = QParser_Make_OR_Query(self, queries);
}
// Clean up.
DECREF(unescape_buf);
DECREF(queries);
DECREF(fields);
DECREF(source_text);
DECREF(tail);
DECREF(top);
return retval;
}
