104 lines
2.6 KiB
Go
104 lines
2.6 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package query
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import (
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"regexp"
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"strings"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/mapping"
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"github.com/blevesearch/bleve/search"
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"github.com/blevesearch/bleve/search/searchers"
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)
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var wildcardRegexpReplacer = strings.NewReplacer(
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// characters in the wildcard that must
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// be escaped in the regexp
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"+", `\+`,
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"(", `\(`,
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")", `\)`,
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"^", `\^`,
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"$", `\$`,
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".", `\.`,
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"{", `\{`,
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"}", `\}`,
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"[", `\[`,
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"]", `\]`,
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`|`, `\|`,
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`\`, `\\`,
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// wildcard characters
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"*", ".*",
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"?", ".")
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type WildcardQuery struct {
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Wildcard string `json:"wildcard"`
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FieldVal string `json:"field,omitempty"`
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BoostVal float64 `json:"boost,omitempty"`
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compiled *regexp.Regexp
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}
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// NewWildcardQuery creates a new Query which finds
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// documents containing terms that match the
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// specified wildcard. In the wildcard pattern '*'
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// will match any sequence of 0 or more characters,
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// and '?' will match any single character.
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func NewWildcardQuery(wildcard string) *WildcardQuery {
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return &WildcardQuery{
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Wildcard: wildcard,
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BoostVal: 1.0,
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}
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}
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func (q *WildcardQuery) Boost() float64 {
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return q.BoostVal
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}
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func (q *WildcardQuery) SetBoost(b float64) Query {
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q.BoostVal = b
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return q
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}
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func (q *WildcardQuery) Field() string {
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return q.FieldVal
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}
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func (q *WildcardQuery) SetField(f string) Query {
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q.FieldVal = f
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return q
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}
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func (q *WildcardQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, explain bool) (search.Searcher, error) {
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field := q.FieldVal
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if q.FieldVal == "" {
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field = m.DefaultSearchField()
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}
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if q.compiled == nil {
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var err error
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q.compiled, err = q.convertToRegexp()
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if err != nil {
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return nil, err
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}
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}
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return searchers.NewRegexpSearcher(i, q.compiled, field, q.BoostVal, explain)
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}
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func (q *WildcardQuery) Validate() error {
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var err error
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q.compiled, err = q.convertToRegexp()
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return err
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}
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func (q *WildcardQuery) convertToRegexp() (*regexp.Regexp, error) {
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regexpString := "^" + wildcardRegexpReplacer.Replace(q.Wildcard) + "$"
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return regexp.Compile(regexpString)
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}
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