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query_wildcard.go
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query_wildcard.go
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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 bleve
import (
"regexp"
"strings"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/search/searchers"
)
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 float64 `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,
BoostVal: 1.0,
}
}
func (q *wildcardQuery) Boost() float64 {
return q.BoostVal
}
func (q *wildcardQuery) SetBoost(b float64) Query {
q.BoostVal = b
return q
}
func (q *wildcardQuery) Field() string {
return q.FieldVal
}
func (q *wildcardQuery) SetField(f string) Query {
q.FieldVal = f
return q
}
func (q *wildcardQuery) Searcher(i index.IndexReader, m *IndexMapping, explain bool) (search.Searcher, error) {
field := q.FieldVal
if q.FieldVal == "" {
field = m.DefaultField
}
if q.compiled == nil {
var err error
q.compiled, err = q.convertToRegexp()
if err != nil {
return nil, err
}
}
return searchers.NewRegexpSearcher(i, q.compiled, field, q.BoostVal, explain)
}
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)
}