mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-28 23:27:27 +02:00
198 lines
4.6 KiB
Go
198 lines
4.6 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 (
|
|
"math"
|
|
|
|
"github.com/blevesearch/bleve/index"
|
|
"github.com/blevesearch/bleve/search"
|
|
)
|
|
|
|
type PhraseSearcher struct {
|
|
indexReader index.IndexReader
|
|
mustSearcher *ConjunctionSearcher
|
|
queryNorm float64
|
|
currMust *search.DocumentMatch
|
|
slop int
|
|
terms []string
|
|
initialized bool
|
|
}
|
|
|
|
func NewPhraseSearcher(indexReader index.IndexReader, mustSearcher *ConjunctionSearcher, terms []string) (*PhraseSearcher, error) {
|
|
// build our searcher
|
|
rv := PhraseSearcher{
|
|
indexReader: indexReader,
|
|
mustSearcher: mustSearcher,
|
|
terms: terms,
|
|
}
|
|
rv.computeQueryNorm()
|
|
return &rv, nil
|
|
}
|
|
|
|
func (s *PhraseSearcher) computeQueryNorm() {
|
|
// first calculate sum of squared weights
|
|
sumOfSquaredWeights := 0.0
|
|
if s.mustSearcher != nil {
|
|
sumOfSquaredWeights += s.mustSearcher.Weight()
|
|
}
|
|
|
|
// now compute query norm from this
|
|
s.queryNorm = 1.0 / math.Sqrt(sumOfSquaredWeights)
|
|
// finally tell all the downstream searchers the norm
|
|
if s.mustSearcher != nil {
|
|
s.mustSearcher.SetQueryNorm(s.queryNorm)
|
|
}
|
|
}
|
|
|
|
func (s *PhraseSearcher) initSearchers(ctx *search.SearchContext) error {
|
|
err := s.advanceNextMust(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
s.initialized = true
|
|
return nil
|
|
}
|
|
|
|
func (s *PhraseSearcher) advanceNextMust(ctx *search.SearchContext) error {
|
|
var err error
|
|
|
|
if s.mustSearcher != nil {
|
|
s.currMust, err = s.mustSearcher.Next(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *PhraseSearcher) Weight() float64 {
|
|
return s.mustSearcher.Weight()
|
|
}
|
|
|
|
func (s *PhraseSearcher) SetQueryNorm(qnorm float64) {
|
|
s.mustSearcher.SetQueryNorm(qnorm)
|
|
}
|
|
|
|
func (s *PhraseSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
|
|
if !s.initialized {
|
|
err := s.initSearchers(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
var rv *search.DocumentMatch
|
|
for s.currMust != nil {
|
|
rvftlm := make(search.FieldTermLocationMap, 0)
|
|
freq := 0
|
|
firstTerm := s.terms[0]
|
|
for field, termLocMap := range s.currMust.Locations {
|
|
rvtlm := make(search.TermLocationMap, 0)
|
|
locations, ok := termLocMap[firstTerm]
|
|
if ok {
|
|
OUTER:
|
|
for _, location := range locations {
|
|
crvtlm := make(search.TermLocationMap, 0)
|
|
INNER:
|
|
for i := 0; i < len(s.terms); i++ {
|
|
nextTerm := s.terms[i]
|
|
if nextTerm != "" {
|
|
// look through all these term locations
|
|
// to try and find the correct offsets
|
|
nextLocations, ok := termLocMap[nextTerm]
|
|
if ok {
|
|
for _, nextLocation := range nextLocations {
|
|
if nextLocation.Pos == location.Pos+float64(i) && nextLocation.SameArrayElement(location) {
|
|
// found a location match for this term
|
|
crvtlm.AddLocation(nextTerm, nextLocation)
|
|
continue INNER
|
|
}
|
|
}
|
|
// if we got here we didn't find a location match for this term
|
|
continue OUTER
|
|
} else {
|
|
continue OUTER
|
|
}
|
|
}
|
|
}
|
|
// if we got here all the terms matched
|
|
freq++
|
|
search.MergeTermLocationMaps(rvtlm, crvtlm)
|
|
rvftlm[field] = rvtlm
|
|
}
|
|
}
|
|
}
|
|
|
|
if freq > 0 {
|
|
// return match
|
|
rv = s.currMust
|
|
rv.Locations = rvftlm
|
|
err := s.advanceNextMust(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return rv, nil
|
|
}
|
|
|
|
err := s.advanceNextMust(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return nil, nil
|
|
}
|
|
|
|
func (s *PhraseSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
|
|
if !s.initialized {
|
|
err := s.initSearchers(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
var err error
|
|
s.currMust, err = s.mustSearcher.Advance(ctx, ID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return s.Next(ctx)
|
|
}
|
|
|
|
func (s *PhraseSearcher) Count() uint64 {
|
|
// for now return a worst case
|
|
return s.mustSearcher.Count()
|
|
}
|
|
|
|
func (s *PhraseSearcher) Close() error {
|
|
if s.mustSearcher != nil {
|
|
err := s.mustSearcher.Close()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *PhraseSearcher) Min() int {
|
|
return 0
|
|
}
|
|
|
|
func (s *PhraseSearcher) DocumentMatchPoolSize() int {
|
|
return s.mustSearcher.DocumentMatchPoolSize() + 1
|
|
}
|