mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-28 15:17:26 +02:00
144 lines
3.7 KiB
Go
144 lines
3.7 KiB
Go
// 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 searcher
|
|
|
|
import (
|
|
"github.com/blevesearch/bleve/index"
|
|
"github.com/blevesearch/bleve/search"
|
|
)
|
|
|
|
type FuzzySearcher struct {
|
|
indexReader index.IndexReader
|
|
term string
|
|
prefix int
|
|
fuzziness int
|
|
field string
|
|
explain bool
|
|
searcher *DisjunctionSearcher
|
|
}
|
|
|
|
func NewFuzzySearcher(indexReader index.IndexReader, term string, prefix, fuzziness int, field string, boost float64, explain bool) (*FuzzySearcher, error) {
|
|
// Note: we don't byte slice the term for a prefix because of runes.
|
|
prefixTerm := ""
|
|
for i, r := range term {
|
|
if i < prefix {
|
|
prefixTerm += string(r)
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
|
|
candidateTerms, err := findFuzzyCandidateTerms(indexReader, term, fuzziness, 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 &FuzzySearcher{
|
|
indexReader: indexReader,
|
|
term: term,
|
|
prefix: prefix,
|
|
fuzziness: fuzziness,
|
|
field: field,
|
|
explain: explain,
|
|
searcher: searcher,
|
|
}, nil
|
|
}
|
|
|
|
func findFuzzyCandidateTerms(indexReader index.IndexReader, term string, fuzziness int, 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 terms and check levenshtein distance
|
|
tfd, err := fieldDict.Next()
|
|
for err == nil && tfd != nil {
|
|
ld, exceeded := search.LevenshteinDistanceMax(term, tfd.Term, fuzziness)
|
|
if !exceeded && ld <= fuzziness {
|
|
rv = append(rv, tfd.Term)
|
|
if tooManyClauses(len(rv)) {
|
|
return rv, tooManyClausesErr()
|
|
}
|
|
}
|
|
tfd, err = fieldDict.Next()
|
|
}
|
|
|
|
return rv, err
|
|
}
|
|
|
|
func (s *FuzzySearcher) Count() uint64 {
|
|
return s.searcher.Count()
|
|
}
|
|
|
|
func (s *FuzzySearcher) Weight() float64 {
|
|
return s.searcher.Weight()
|
|
}
|
|
|
|
func (s *FuzzySearcher) SetQueryNorm(qnorm float64) {
|
|
s.searcher.SetQueryNorm(qnorm)
|
|
}
|
|
|
|
func (s *FuzzySearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
|
|
return s.searcher.Next(ctx)
|
|
|
|
}
|
|
|
|
func (s *FuzzySearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
|
|
return s.searcher.Advance(ctx, ID)
|
|
}
|
|
|
|
func (s *FuzzySearcher) Close() error {
|
|
return s.searcher.Close()
|
|
}
|
|
|
|
func (s *FuzzySearcher) Min() int {
|
|
return 0
|
|
}
|
|
|
|
func (s *FuzzySearcher) DocumentMatchPoolSize() int {
|
|
return s.searcher.DocumentMatchPoolSize()
|
|
}
|