123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106 |
- // Copyright (c) 2014 Couchbase, Inc.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package query
-
- import (
- "regexp"
- "strings"
-
- "github.com/blevesearch/bleve/index"
- "github.com/blevesearch/bleve/mapping"
- "github.com/blevesearch/bleve/search"
- "github.com/blevesearch/bleve/search/searcher"
- )
-
- var wildcardRegexpReplacer = strings.NewReplacer(
- // characters in the wildcard that must
- // be escaped in the regexp
- "+", `\+`,
- "(", `\(`,
- ")", `\)`,
- "^", `\^`,
- "$", `\$`,
- ".", `\.`,
- "{", `\{`,
- "}", `\}`,
- "[", `\[`,
- "]", `\]`,
- `|`, `\|`,
- `\`, `\\`,
- // wildcard characters
- "*", ".*",
- "?", ".")
-
- type WildcardQuery struct {
- Wildcard string `json:"wildcard"`
- FieldVal string `json:"field,omitempty"`
- BoostVal *Boost `json:"boost,omitempty"`
- compiled *regexp.Regexp
- }
-
- // NewWildcardQuery creates a new Query which finds
- // documents containing terms that match the
- // specified wildcard. In the wildcard pattern '*'
- // will match any sequence of 0 or more characters,
- // and '?' will match any single character.
- func NewWildcardQuery(wildcard string) *WildcardQuery {
- return &WildcardQuery{
- Wildcard: wildcard,
- }
- }
-
- func (q *WildcardQuery) SetBoost(b float64) {
- boost := Boost(b)
- q.BoostVal = &boost
- }
-
- func (q *WildcardQuery) Boost() float64 {
- return q.BoostVal.Value()
- }
-
- func (q *WildcardQuery) SetField(f string) {
- q.FieldVal = f
- }
-
- func (q *WildcardQuery) Field() string {
- return q.FieldVal
- }
-
- func (q *WildcardQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, options search.SearcherOptions) (search.Searcher, error) {
- field := q.FieldVal
- if q.FieldVal == "" {
- field = m.DefaultSearchField()
- }
- if q.compiled == nil {
- var err error
- q.compiled, err = q.convertToRegexp()
- if err != nil {
- return nil, err
- }
- }
-
- return searcher.NewRegexpSearcher(i, q.compiled, field, q.BoostVal.Value(), options)
- }
-
- func (q *WildcardQuery) Validate() error {
- var err error
- q.compiled, err = q.convertToRegexp()
- return err
- }
-
- func (q *WildcardQuery) convertToRegexp() (*regexp.Regexp, error) {
- regexpString := wildcardRegexpReplacer.Replace(q.Wildcard)
- return regexp.Compile(regexpString)
- }
|