b0f7457d9e
* Improve issue indexer * Fix new issue sqlite bug * Different test indexer paths for each db * Add integration indexer paths to make clean
80 lines
2.4 KiB
Go
80 lines
2.4 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"
|
|
)
|
|
|
|
// NewRegexpSearcher creates a searcher which will match documents that
|
|
// contain terms which match the pattern regexp. The match must be EXACT
|
|
// matching the entire term. The provided regexp SHOULD NOT start with ^
|
|
// or end with $ as this can intefere with the implementation. Separately,
|
|
// matches will be checked to ensure they match the entire term.
|
|
func NewRegexpSearcher(indexReader index.IndexReader, pattern *regexp.Regexp,
|
|
field string, boost float64, options search.SearcherOptions) (
|
|
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
|
|
}
|
|
}
|
|
|
|
return NewMultiTermSearcher(indexReader, candidateTerms, field, boost,
|
|
options, true)
|
|
}
|
|
|
|
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 {
|
|
matchPos := pattern.FindStringIndex(tfd.Term)
|
|
if matchPos != nil && matchPos[0] == 0 && matchPos[1] == len(tfd.Term) {
|
|
rv = append(rv, tfd.Term)
|
|
if tooManyClauses(len(rv)) {
|
|
return rv, tooManyClausesErr()
|
|
}
|
|
}
|
|
tfd, err = fieldDict.Next()
|
|
}
|
|
|
|
return rv, err
|
|
}
|