mirror of https://github.com/go-gitea/gitea.git
93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
// Copyright (c) 2015 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 searcher
|
|
|
|
import (
|
|
"regexp"
|
|
|
|
"github.com/blevesearch/bleve/index"
|
|
"github.com/blevesearch/bleve/search"
|
|
)
|
|
|
|
func NewRegexpSearcher(indexReader index.IndexReader, pattern *regexp.Regexp, field string, boost float64, explain bool) (search.Searcher, error) {
|
|
|
|
prefixTerm, complete := pattern.LiteralPrefix()
|
|
var candidateTerms []string
|
|
if complete {
|
|
// there is no pattern
|
|
candidateTerms = []string{prefixTerm}
|
|
} else {
|
|
var err error
|
|
candidateTerms, err = findRegexpCandidateTerms(indexReader, pattern, field, prefixTerm)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
// enumerate all the terms in the range
|
|
qsearchers := make([]search.Searcher, 0, len(candidateTerms))
|
|
qsearchersClose := func() {
|
|
for _, searcher := range qsearchers {
|
|
_ = searcher.Close()
|
|
}
|
|
}
|
|
for _, cterm := range candidateTerms {
|
|
qsearcher, err := NewTermSearcher(indexReader, cterm, field, boost, explain)
|
|
if err != nil {
|
|
qsearchersClose()
|
|
return nil, err
|
|
}
|
|
qsearchers = append(qsearchers, qsearcher)
|
|
}
|
|
|
|
// build disjunction searcher of these ranges
|
|
searcher, err := NewDisjunctionSearcher(indexReader, qsearchers, 0, explain)
|
|
if err != nil {
|
|
qsearchersClose()
|
|
return nil, err
|
|
}
|
|
|
|
return searcher, err
|
|
}
|
|
|
|
func findRegexpCandidateTerms(indexReader index.IndexReader, pattern *regexp.Regexp, field, prefixTerm string) (rv []string, err error) {
|
|
rv = make([]string, 0)
|
|
var fieldDict index.FieldDict
|
|
if len(prefixTerm) > 0 {
|
|
fieldDict, err = indexReader.FieldDictPrefix(field, []byte(prefixTerm))
|
|
} else {
|
|
fieldDict, err = indexReader.FieldDict(field)
|
|
}
|
|
defer func() {
|
|
if cerr := fieldDict.Close(); cerr != nil && err == nil {
|
|
err = cerr
|
|
}
|
|
}()
|
|
|
|
// enumerate the terms and check against regexp
|
|
tfd, err := fieldDict.Next()
|
|
for err == nil && tfd != nil {
|
|
if pattern.MatchString(tfd.Term) {
|
|
rv = append(rv, tfd.Term)
|
|
if tooManyClauses(len(rv)) {
|
|
return rv, tooManyClausesErr()
|
|
}
|
|
}
|
|
tfd, err = fieldDict.Next()
|
|
}
|
|
|
|
return rv, err
|
|
}
|