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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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