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336
vendor/github.com/blevesearch/bleve/query.go
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vendored
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336
vendor/github.com/blevesearch/bleve/query.go
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// 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 bleve
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import (
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"encoding/json"
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"fmt"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/search"
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)
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// A Query represents a description of the type
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// and parameters for a query into the index.
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type Query interface {
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Boost() float64
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SetBoost(b float64) Query
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Field() string
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SetField(f string) Query
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Searcher(i index.IndexReader, m *IndexMapping, explain bool) (search.Searcher, error)
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Validate() error
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}
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// ParseQuery deserializes a JSON representation of
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// a Query object.
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func ParseQuery(input []byte) (Query, error) {
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var tmp map[string]interface{}
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err := json.Unmarshal(input, &tmp)
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if err != nil {
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return nil, err
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}
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_, isMatchQuery := tmp["match"]
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_, hasFuzziness := tmp["fuzziness"]
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if hasFuzziness && !isMatchQuery {
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var rv fuzzyQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, isTermQuery := tmp["term"]
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if isTermQuery {
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var rv termQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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if isMatchQuery {
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var rv matchQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, isMatchPhraseQuery := tmp["match_phrase"]
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if isMatchPhraseQuery {
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var rv matchPhraseQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasMust := tmp["must"]
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_, hasShould := tmp["should"]
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_, hasMustNot := tmp["must_not"]
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if hasMust || hasShould || hasMustNot {
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var rv booleanQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasTerms := tmp["terms"]
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if hasTerms {
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var rv phraseQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasConjuncts := tmp["conjuncts"]
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if hasConjuncts {
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var rv conjunctionQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasDisjuncts := tmp["disjuncts"]
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if hasDisjuncts {
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var rv disjunctionQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasSyntaxQuery := tmp["query"]
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if hasSyntaxQuery {
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var rv queryStringQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasMin := tmp["min"]
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_, hasMax := tmp["max"]
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if hasMin || hasMax {
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var rv numericRangeQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasStart := tmp["start"]
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_, hasEnd := tmp["end"]
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if hasStart || hasEnd {
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var rv dateRangeQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasPrefix := tmp["prefix"]
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if hasPrefix {
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var rv prefixQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasRegexp := tmp["regexp"]
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if hasRegexp {
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var rv regexpQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasWildcard := tmp["wildcard"]
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if hasWildcard {
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var rv wildcardQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasMatchAll := tmp["match_all"]
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if hasMatchAll {
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var rv matchAllQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasMatchNone := tmp["match_none"]
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if hasMatchNone {
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var rv matchNoneQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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_, hasDocIds := tmp["ids"]
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if hasDocIds {
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var rv docIDQuery
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err := json.Unmarshal(input, &rv)
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if err != nil {
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return nil, err
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}
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if rv.Boost() == 0 {
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rv.SetBoost(1)
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}
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return &rv, nil
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}
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return nil, ErrorUnknownQueryType
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}
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// expandQuery traverses the input query tree and returns a new tree where
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// query string queries have been expanded into base queries. Returned tree may
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// reference queries from the input tree or new queries.
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func expandQuery(m *IndexMapping, query Query) (Query, error) {
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var expand func(query Query) (Query, error)
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var expandSlice func(queries []Query) ([]Query, error)
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expandSlice = func(queries []Query) ([]Query, error) {
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expanded := []Query{}
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for _, q := range queries {
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exp, err := expand(q)
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if err != nil {
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return nil, err
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}
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expanded = append(expanded, exp)
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}
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return expanded, nil
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}
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expand = func(query Query) (Query, error) {
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switch query.(type) {
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case *queryStringQuery:
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q := query.(*queryStringQuery)
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parsed, err := parseQuerySyntax(q.Query, m)
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if err != nil {
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return nil, fmt.Errorf("could not parse '%s': %s", q.Query, err)
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}
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return expand(parsed)
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case *conjunctionQuery:
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q := *query.(*conjunctionQuery)
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children, err := expandSlice(q.Conjuncts)
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if err != nil {
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return nil, err
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}
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q.Conjuncts = children
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return &q, nil
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case *disjunctionQuery:
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q := *query.(*disjunctionQuery)
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children, err := expandSlice(q.Disjuncts)
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if err != nil {
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return nil, err
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}
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q.Disjuncts = children
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return &q, nil
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case *booleanQuery:
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q := *query.(*booleanQuery)
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var err error
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q.Must, err = expand(q.Must)
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if err != nil {
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return nil, err
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}
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q.Should, err = expand(q.Should)
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if err != nil {
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return nil, err
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}
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q.MustNot, err = expand(q.MustNot)
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if err != nil {
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return nil, err
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}
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return &q, nil
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case *phraseQuery:
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q := *query.(*phraseQuery)
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children, err := expandSlice(q.termQueries)
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if err != nil {
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return nil, err
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}
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q.termQueries = children
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return &q, nil
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default:
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return query, nil
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}
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}
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return expand(query)
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}
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// DumpQuery returns a string representation of the query tree, where query
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// string queries have been expanded into base queries. The output format is
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// meant for debugging purpose and may change in the future.
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func DumpQuery(m *IndexMapping, query Query) (string, error) {
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q, err := expandQuery(m, query)
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if err != nil {
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return "", err
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}
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data, err := json.MarshalIndent(q, "", " ")
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return string(data), err
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}
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