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- // 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"
- )
-
- type RegexpQuery struct {
- Regexp string `json:"regexp"`
- FieldVal string `json:"field,omitempty"`
- BoostVal *Boost `json:"boost,omitempty"`
- compiled *regexp.Regexp
- }
-
- // NewRegexpQuery creates a new Query which finds
- // documents containing terms that match the
- // specified regular expression. The regexp pattern
- // SHOULD NOT include ^ or $ modifiers, the search
- // will only match entire terms even without them.
- func NewRegexpQuery(regexp string) *RegexpQuery {
- return &RegexpQuery{
- Regexp: regexp,
- }
- }
-
- func (q *RegexpQuery) SetBoost(b float64) {
- boost := Boost(b)
- q.BoostVal = &boost
- }
-
- func (q *RegexpQuery) Boost() float64 {
- return q.BoostVal.Value()
- }
-
- func (q *RegexpQuery) SetField(f string) {
- q.FieldVal = f
- }
-
- func (q *RegexpQuery) Field() string {
- return q.FieldVal
- }
-
- func (q *RegexpQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, options search.SearcherOptions) (search.Searcher, error) {
- field := q.FieldVal
- if q.FieldVal == "" {
- field = m.DefaultSearchField()
- }
- err := q.compile()
- if err != nil {
- return nil, err
- }
-
- return searcher.NewRegexpSearcher(i, q.compiled, field, q.BoostVal.Value(), options)
- }
-
- func (q *RegexpQuery) Validate() error {
- return q.compile()
- }
-
- func (q *RegexpQuery) compile() error {
- if q.compiled == nil {
- // require that pattern NOT be anchored to start and end of term
- actualRegexp := q.Regexp
- if strings.HasPrefix(actualRegexp, "^") {
- actualRegexp = actualRegexp[1:] // remove leading ^
- }
- // do not attempt to remove trailing $, it's presence is not
- // known to interfere with LiteralPrefix() the way ^ does
- // and removing $ introduces possible ambiguities with escaped \$, \\$, etc
- var err error
- q.compiled, err = regexp.Compile(actualRegexp)
- if err != nil {
- return err
- }
- }
- return nil
- }
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