initial commit

vendor/github.com/blevesearch/bleve/search/searchers/ordered_searchers_list.go

@@ -0,0 +1,30 @@
+//  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 searchers
+
+import (
+	"github.com/blevesearch/bleve/search"
+)
+
+type OrderedSearcherList []search.Searcher
+
+// sort.Interface
+
+func (otrl OrderedSearcherList) Len() int {
+	return len(otrl)
+}
+
+func (otrl OrderedSearcherList) Less(i, j int) bool {
+	return otrl[i].Count() < otrl[j].Count()
+}
+
+func (otrl OrderedSearcherList) Swap(i, j int) {
+	otrl[i], otrl[j] = otrl[j], otrl[i]
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_boolean.go

@@ -0,0 +1,335 @@
+//  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 searchers
+
+import (
+	"math"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+	"github.com/blevesearch/bleve/search/scorers"
+)
+
+type BooleanSearcher struct {
+	initialized     bool
+	indexReader     index.IndexReader
+	mustSearcher    search.Searcher
+	shouldSearcher  search.Searcher
+	mustNotSearcher search.Searcher
+	queryNorm       float64
+	currMust        *search.DocumentMatch
+	currShould      *search.DocumentMatch
+	currMustNot     *search.DocumentMatch
+	currentID       string
+	min             uint64
+	scorer          *scorers.ConjunctionQueryScorer
+}
+
+func NewBooleanSearcher(indexReader index.IndexReader, mustSearcher search.Searcher, shouldSearcher search.Searcher, mustNotSearcher search.Searcher, explain bool) (*BooleanSearcher, error) {
+	// build our searcher
+	rv := BooleanSearcher{
+		indexReader:     indexReader,
+		mustSearcher:    mustSearcher,
+		shouldSearcher:  shouldSearcher,
+		mustNotSearcher: mustNotSearcher,
+		scorer:          scorers.NewConjunctionQueryScorer(explain),
+	}
+	rv.computeQueryNorm()
+	return &rv, nil
+}
+
+func (s *BooleanSearcher) computeQueryNorm() {
+	// first calculate sum of squared weights
+	sumOfSquaredWeights := 0.0
+	if s.mustSearcher != nil {
+		sumOfSquaredWeights += s.mustSearcher.Weight()
+	}
+	if s.shouldSearcher != nil {
+		sumOfSquaredWeights += s.shouldSearcher.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)
+	}
+	if s.shouldSearcher != nil {
+		s.shouldSearcher.SetQueryNorm(s.queryNorm)
+	}
+}
+
+func (s *BooleanSearcher) initSearchers() error {
+	var err error
+	// get all searchers pointing at their first match
+	if s.mustSearcher != nil {
+		s.currMust, err = s.mustSearcher.Next()
+		if err != nil {
+			return err
+		}
+	}
+
+	if s.shouldSearcher != nil {
+		s.currShould, err = s.shouldSearcher.Next()
+		if err != nil {
+			return err
+		}
+	}
+
+	if s.mustNotSearcher != nil {
+		s.currMustNot, err = s.mustNotSearcher.Next()
+		if err != nil {
+			return err
+		}
+	}
+
+	if s.mustSearcher != nil && s.currMust != nil {
+		s.currentID = s.currMust.ID
+	} else if s.mustSearcher == nil && s.currShould != nil {
+		s.currentID = s.currShould.ID
+	} else {
+		s.currentID = ""
+	}
+
+	s.initialized = true
+	return nil
+}
+
+func (s *BooleanSearcher) advanceNextMust() error {
+	var err error
+
+	if s.mustSearcher != nil {
+		s.currMust, err = s.mustSearcher.Next()
+		if err != nil {
+			return err
+		}
+	} else if s.mustSearcher == nil {
+		s.currShould, err = s.shouldSearcher.Next()
+		if err != nil {
+			return err
+		}
+	}
+
+	if s.mustSearcher != nil && s.currMust != nil {
+		s.currentID = s.currMust.ID
+	} else if s.mustSearcher == nil && s.currShould != nil {
+		s.currentID = s.currShould.ID
+	} else {
+		s.currentID = ""
+	}
+	return nil
+}
+
+func (s *BooleanSearcher) Weight() float64 {
+	var rv float64
+	if s.mustSearcher != nil {
+		rv += s.mustSearcher.Weight()
+	}
+	if s.shouldSearcher != nil {
+		rv += s.shouldSearcher.Weight()
+	}
+
+	return rv
+}
+
+func (s *BooleanSearcher) SetQueryNorm(qnorm float64) {
+	if s.mustSearcher != nil {
+		s.mustSearcher.SetQueryNorm(qnorm)
+	}
+	if s.shouldSearcher != nil {
+		s.shouldSearcher.SetQueryNorm(qnorm)
+	}
+}
+
+func (s *BooleanSearcher) Next() (*search.DocumentMatch, error) {
+
+	if !s.initialized {
+		err := s.initSearchers()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	var err error
+	var rv *search.DocumentMatch
+
+	for s.currentID != "" {
+		if s.currMustNot != nil && s.currMustNot.ID < s.currentID {
+			// advance must not searcher to our candidate entry
+			s.currMustNot, err = s.mustNotSearcher.Advance(s.currentID)
+			if err != nil {
+				return nil, err
+			}
+			if s.currMustNot != nil && s.currMustNot.ID == s.currentID {
+				// the candidate is excluded
+				err = s.advanceNextMust()
+				if err != nil {
+					return nil, err
+				}
+				continue
+			}
+		} else if s.currMustNot != nil && s.currMustNot.ID == s.currentID {
+			// the candidate is excluded
+			err = s.advanceNextMust()
+			if err != nil {
+				return nil, err
+			}
+			continue
+		}
+
+		if s.currShould != nil && s.currShould.ID < s.currentID {
+			// advance should searcher to our candidate entry
+			s.currShould, err = s.shouldSearcher.Advance(s.currentID)
+			if err != nil {
+				return nil, err
+			}
+			if s.currShould != nil && s.currShould.ID == s.currentID {
+				// score bonus matches should
+				var cons []*search.DocumentMatch
+				if s.currMust != nil {
+					cons = []*search.DocumentMatch{
+						s.currMust,
+						s.currShould,
+					}
+				} else {
+					cons = []*search.DocumentMatch{
+						s.currShould,
+					}
+				}
+				rv = s.scorer.Score(cons)
+				err = s.advanceNextMust()
+				if err != nil {
+					return nil, err
+				}
+				break
+			} else if s.shouldSearcher.Min() == 0 {
+				// match is OK anyway
+				rv = s.scorer.Score([]*search.DocumentMatch{s.currMust})
+				err = s.advanceNextMust()
+				if err != nil {
+					return nil, err
+				}
+				break
+			}
+		} else if s.currShould != nil && s.currShould.ID == s.currentID {
+			// score bonus matches should
+			var cons []*search.DocumentMatch
+			if s.currMust != nil {
+				cons = []*search.DocumentMatch{
+					s.currMust,
+					s.currShould,
+				}
+			} else {
+				cons = []*search.DocumentMatch{
+					s.currShould,
+				}
+			}
+			rv = s.scorer.Score(cons)
+			err = s.advanceNextMust()
+			if err != nil {
+				return nil, err
+			}
+			break
+		} else if s.shouldSearcher == nil || s.shouldSearcher.Min() == 0 {
+			// match is OK anyway
+			rv = s.scorer.Score([]*search.DocumentMatch{s.currMust})
+			err = s.advanceNextMust()
+			if err != nil {
+				return nil, err
+			}
+			break
+		}
+
+		err = s.advanceNextMust()
+		if err != nil {
+			return nil, err
+		}
+	}
+	return rv, nil
+}
+
+func (s *BooleanSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+
+	if !s.initialized {
+		err := s.initSearchers()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	var err error
+	if s.mustSearcher != nil {
+		s.currMust, err = s.mustSearcher.Advance(ID)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if s.shouldSearcher != nil {
+		s.currShould, err = s.shouldSearcher.Advance(ID)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if s.mustNotSearcher != nil {
+		s.currMustNot, err = s.mustNotSearcher.Advance(ID)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if s.mustSearcher != nil && s.currMust != nil {
+		s.currentID = s.currMust.ID
+	} else if s.mustSearcher == nil && s.currShould != nil {
+		s.currentID = s.currShould.ID
+	} else {
+		s.currentID = ""
+	}
+
+	return s.Next()
+}
+
+func (s *BooleanSearcher) Count() uint64 {
+
+	// for now return a worst case
+	var sum uint64
+	if s.mustSearcher != nil {
+		sum += s.mustSearcher.Count()
+	}
+	if s.shouldSearcher != nil {
+		sum += s.shouldSearcher.Count()
+	}
+	return sum
+}
+
+func (s *BooleanSearcher) Close() error {
+	if s.mustSearcher != nil {
+		err := s.mustSearcher.Close()
+		if err != nil {
+			return err
+		}
+	}
+	if s.shouldSearcher != nil {
+		err := s.shouldSearcher.Close()
+		if err != nil {
+			return err
+		}
+	}
+	if s.mustNotSearcher != nil {
+		err := s.mustNotSearcher.Close()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *BooleanSearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_conjunction.go

@@ -0,0 +1,197 @@
+//  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 searchers
+
+import (
+	"math"
+	"sort"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+	"github.com/blevesearch/bleve/search/scorers"
+)
+
+type ConjunctionSearcher struct {
+	initialized bool
+	indexReader index.IndexReader
+	searchers   OrderedSearcherList
+	explain     bool
+	queryNorm   float64
+	currs       []*search.DocumentMatch
+	currentID   string
+	scorer      *scorers.ConjunctionQueryScorer
+}
+
+func NewConjunctionSearcher(indexReader index.IndexReader, qsearchers []search.Searcher, explain bool) (*ConjunctionSearcher, error) {
+	// build the downstream searchers
+	searchers := make(OrderedSearcherList, len(qsearchers))
+	for i, searcher := range qsearchers {
+		searchers[i] = searcher
+	}
+	// sort the searchers
+	sort.Sort(searchers)
+	// build our searcher
+	rv := ConjunctionSearcher{
+		indexReader: indexReader,
+		explain:     explain,
+		searchers:   searchers,
+		currs:       make([]*search.DocumentMatch, len(searchers)),
+		scorer:      scorers.NewConjunctionQueryScorer(explain),
+	}
+	rv.computeQueryNorm()
+	return &rv, nil
+}
+
+func (s *ConjunctionSearcher) computeQueryNorm() {
+	// first calculate sum of squared weights
+	sumOfSquaredWeights := 0.0
+	for _, termSearcher := range s.searchers {
+		sumOfSquaredWeights += termSearcher.Weight()
+	}
+	// now compute query norm from this
+	s.queryNorm = 1.0 / math.Sqrt(sumOfSquaredWeights)
+	// finally tell all the downstream searchers the norm
+	for _, termSearcher := range s.searchers {
+		termSearcher.SetQueryNorm(s.queryNorm)
+	}
+}
+
+func (s *ConjunctionSearcher) initSearchers() error {
+	var err error
+	// get all searchers pointing at their first match
+	for i, termSearcher := range s.searchers {
+		s.currs[i], err = termSearcher.Next()
+		if err != nil {
+			return err
+		}
+	}
+
+	if len(s.currs) > 0 {
+		if s.currs[0] != nil {
+			s.currentID = s.currs[0].ID
+		} else {
+			s.currentID = ""
+		}
+	}
+
+	s.initialized = true
+	return nil
+}
+
+func (s *ConjunctionSearcher) Weight() float64 {
+	var rv float64
+	for _, searcher := range s.searchers {
+		rv += searcher.Weight()
+	}
+	return rv
+}
+
+func (s *ConjunctionSearcher) SetQueryNorm(qnorm float64) {
+	for _, searcher := range s.searchers {
+		searcher.SetQueryNorm(qnorm)
+	}
+}
+
+func (s *ConjunctionSearcher) Next() (*search.DocumentMatch, error) {
+	if !s.initialized {
+		err := s.initSearchers()
+		if err != nil {
+			return nil, err
+		}
+	}
+	var rv *search.DocumentMatch
+	var err error
+OUTER:
+	for s.currentID != "" {
+		for i, termSearcher := range s.searchers {
+			if s.currs[i] != nil && s.currs[i].ID != s.currentID {
+				if s.currentID < s.currs[i].ID {
+					s.currentID = s.currs[i].ID
+					continue OUTER
+				}
+				// this reader doesn't have the currentID, try to advance
+				s.currs[i], err = termSearcher.Advance(s.currentID)
+				if err != nil {
+					return nil, err
+				}
+				if s.currs[i] == nil {
+					s.currentID = ""
+					continue OUTER
+				}
+				if s.currs[i].ID != s.currentID {
+					// we just advanced, so it doesn't match, it must be greater
+					// no need to call next
+					s.currentID = s.currs[i].ID
+					continue OUTER
+				}
+			} else if s.currs[i] == nil {
+				s.currentID = ""
+				continue OUTER
+			}
+		}
+		// if we get here, a doc matched all readers, sum the score and add it
+		rv = s.scorer.Score(s.currs)
+
+		// prepare for next entry
+		s.currs[0], err = s.searchers[0].Next()
+		if err != nil {
+			return nil, err
+		}
+		if s.currs[0] == nil {
+			s.currentID = ""
+		} else {
+			s.currentID = s.currs[0].ID
+		}
+		// don't continue now, wait for the next call to Next()
+		break
+	}
+	return rv, nil
+}
+
+func (s *ConjunctionSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	if !s.initialized {
+		err := s.initSearchers()
+		if err != nil {
+			return nil, err
+		}
+	}
+	var err error
+	for i, searcher := range s.searchers {
+		s.currs[i], err = searcher.Advance(ID)
+		if err != nil {
+			return nil, err
+		}
+	}
+	s.currentID = ID
+	return s.Next()
+}
+
+func (s *ConjunctionSearcher) Count() uint64 {
+	// for now return a worst case
+	var sum uint64
+	for _, searcher := range s.searchers {
+		sum += searcher.Count()
+	}
+	return sum
+}
+
+func (s *ConjunctionSearcher) Close() error {
+	for _, searcher := range s.searchers {
+		err := searcher.Close()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *ConjunctionSearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_disjunction.go

@@ -0,0 +1,198 @@
+//  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 searchers
+
+import (
+	"fmt"
+	"math"
+	"sort"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+	"github.com/blevesearch/bleve/search/scorers"
+)
+
+// DisjunctionMaxClauseCount is a compile time setting that applications can
+// adjust to non-zero value to cause the DisjunctionSearcher to return an
+// error instead of exeucting searches when the size exceeds this value.
+var DisjunctionMaxClauseCount = 0
+
+type DisjunctionSearcher struct {
+	initialized bool
+	indexReader index.IndexReader
+	searchers   OrderedSearcherList
+	queryNorm   float64
+	currs       []*search.DocumentMatch
+	currentID   string
+	scorer      *scorers.DisjunctionQueryScorer
+	min         float64
+}
+
+func NewDisjunctionSearcher(indexReader index.IndexReader, qsearchers []search.Searcher, min float64, explain bool) (*DisjunctionSearcher, error) {
+	if DisjunctionMaxClauseCount != 0 && len(qsearchers) > DisjunctionMaxClauseCount {
+		return nil, fmt.Errorf("TooManyClauses[maxClauseCount is set to %d]", DisjunctionMaxClauseCount)
+	}
+	// build the downstream searchers
+	searchers := make(OrderedSearcherList, len(qsearchers))
+	for i, searcher := range qsearchers {
+		searchers[i] = searcher
+	}
+	// sort the searchers
+	sort.Sort(sort.Reverse(searchers))
+	// build our searcher
+	rv := DisjunctionSearcher{
+		indexReader: indexReader,
+		searchers:   searchers,
+		currs:       make([]*search.DocumentMatch, len(searchers)),
+		scorer:      scorers.NewDisjunctionQueryScorer(explain),
+		min:         min,
+	}
+	rv.computeQueryNorm()
+	return &rv, nil
+}
+
+func (s *DisjunctionSearcher) computeQueryNorm() {
+	// first calculate sum of squared weights
+	sumOfSquaredWeights := 0.0
+	for _, termSearcher := range s.searchers {
+		sumOfSquaredWeights += termSearcher.Weight()
+	}
+	// now compute query norm from this
+	s.queryNorm = 1.0 / math.Sqrt(sumOfSquaredWeights)
+	// finally tell all the downstream searchers the norm
+	for _, termSearcher := range s.searchers {
+		termSearcher.SetQueryNorm(s.queryNorm)
+	}
+}
+
+func (s *DisjunctionSearcher) initSearchers() error {
+	var err error
+	// get all searchers pointing at their first match
+	for i, termSearcher := range s.searchers {
+		s.currs[i], err = termSearcher.Next()
+		if err != nil {
+			return err
+		}
+	}
+
+	s.currentID = s.nextSmallestID()
+	s.initialized = true
+	return nil
+}
+
+func (s *DisjunctionSearcher) nextSmallestID() string {
+	rv := ""
+	for _, curr := range s.currs {
+		if curr != nil && (curr.ID < rv || rv == "") {
+			rv = curr.ID
+		}
+	}
+	return rv
+}
+
+func (s *DisjunctionSearcher) Weight() float64 {
+	var rv float64
+	for _, searcher := range s.searchers {
+		rv += searcher.Weight()
+	}
+	return rv
+}
+
+func (s *DisjunctionSearcher) SetQueryNorm(qnorm float64) {
+	for _, searcher := range s.searchers {
+		searcher.SetQueryNorm(qnorm)
+	}
+}
+
+func (s *DisjunctionSearcher) Next() (*search.DocumentMatch, error) {
+	if !s.initialized {
+		err := s.initSearchers()
+		if err != nil {
+			return nil, err
+		}
+	}
+	var err error
+	var rv *search.DocumentMatch
+	matching := make([]*search.DocumentMatch, 0, len(s.searchers))
+
+	found := false
+	for !found && s.currentID != "" {
+		for _, curr := range s.currs {
+			if curr != nil && curr.ID == s.currentID {
+				matching = append(matching, curr)
+			}
+		}
+
+		if len(matching) >= int(s.min) {
+			found = true
+			// score this match
+			rv = s.scorer.Score(matching, len(matching), len(s.searchers))
+		}
+
+		// reset matching
+		matching = make([]*search.DocumentMatch, 0)
+		// invoke next on all the matching searchers
+		for i, curr := range s.currs {
+			if curr != nil && curr.ID == s.currentID {
+				searcher := s.searchers[i]
+				s.currs[i], err = searcher.Next()
+				if err != nil {
+					return nil, err
+				}
+			}
+		}
+		s.currentID = s.nextSmallestID()
+	}
+	return rv, nil
+}
+
+func (s *DisjunctionSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	if !s.initialized {
+		err := s.initSearchers()
+		if err != nil {
+			return nil, err
+		}
+	}
+	// get all searchers pointing at their first match
+	var err error
+	for i, termSearcher := range s.searchers {
+		s.currs[i], err = termSearcher.Advance(ID)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	s.currentID = s.nextSmallestID()
+
+	return s.Next()
+}
+
+func (s *DisjunctionSearcher) Count() uint64 {
+	// for now return a worst case
+	var sum uint64
+	for _, searcher := range s.searchers {
+		sum += searcher.Count()
+	}
+	return sum
+}
+
+func (s *DisjunctionSearcher) Close() error {
+	for _, searcher := range s.searchers {
+		err := searcher.Close()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *DisjunctionSearcher) Min() int {
+	return int(s.min) // FIXME just make this an int
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_docid.go

@@ -0,0 +1,102 @@
+//  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 searchers
+
+import (
+	"sort"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+	"github.com/blevesearch/bleve/search/scorers"
+)
+
+// DocIDSearcher returns documents matching a predefined set of identifiers.
+type DocIDSearcher struct {
+	ids     []string
+	current int
+	scorer  *scorers.ConstantScorer
+}
+
+func NewDocIDSearcher(indexReader index.IndexReader, ids []string, boost float64,
+	explain bool) (searcher *DocIDSearcher, err error) {
+
+	kept := make([]string, len(ids))
+	copy(kept, ids)
+	sort.Strings(kept)
+
+	if len(ids) > 0 {
+		var idReader index.DocIDReader
+		endTerm := string(incrementBytes([]byte(kept[len(kept)-1])))
+		idReader, err = indexReader.DocIDReader(kept[0], endTerm)
+		if err != nil {
+			return nil, err
+		}
+		defer func() {
+			if cerr := idReader.Close(); err == nil && cerr != nil {
+				err = cerr
+			}
+		}()
+		j := 0
+		for _, id := range kept {
+			doc, err := idReader.Advance(id)
+			if err != nil {
+				return nil, err
+			}
+			// Non-duplicate match
+			if doc == id && (j == 0 || kept[j-1] != id) {
+				kept[j] = id
+				j++
+			}
+		}
+		kept = kept[:j]
+	}
+
+	scorer := scorers.NewConstantScorer(1.0, boost, explain)
+	return &DocIDSearcher{
+		ids:    kept,
+		scorer: scorer,
+	}, nil
+}
+
+func (s *DocIDSearcher) Count() uint64 {
+	return uint64(len(s.ids))
+}
+
+func (s *DocIDSearcher) Weight() float64 {
+	return s.scorer.Weight()
+}
+
+func (s *DocIDSearcher) SetQueryNorm(qnorm float64) {
+	s.scorer.SetQueryNorm(qnorm)
+}
+
+func (s *DocIDSearcher) Next() (*search.DocumentMatch, error) {
+	if s.current >= len(s.ids) {
+		return nil, nil
+	}
+	id := s.ids[s.current]
+	s.current++
+	docMatch := s.scorer.Score(id)
+	return docMatch, nil
+
+}
+
+func (s *DocIDSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	s.current = sort.SearchStrings(s.ids, ID)
+	return s.Next()
+}
+
+func (s *DocIDSearcher) Close() error {
+	return nil
+}
+
+func (s *DocIDSearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_fuzzy.go

@@ -0,0 +1,117 @@
+//  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 searchers
+
+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) {
+	prefixTerm := ""
+	for i, r := range term {
+		if i < prefix {
+			prefixTerm += string(r)
+		}
+	}
+
+	// find the terms with this prefix
+	var fieldDict index.FieldDict
+	var err error
+	if len(prefixTerm) > 0 {
+		fieldDict, err = indexReader.FieldDictPrefix(field, []byte(prefixTerm))
+	} else {
+		fieldDict, err = indexReader.FieldDict(field)
+	}
+
+	// enumerate terms and check levenshtein distance
+	candidateTerms := make([]string, 0)
+	tfd, err := fieldDict.Next()
+	for err == nil && tfd != nil {
+		ld, exceeded := search.LevenshteinDistanceMax(&term, &tfd.Term, fuzziness)
+		if !exceeded && ld <= fuzziness {
+			candidateTerms = append(candidateTerms, tfd.Term)
+		}
+		tfd, err = fieldDict.Next()
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	err = fieldDict.Close()
+	if err != nil {
+		return nil, err
+	}
+
+	// enumerate all the terms in the range
+	qsearchers := make([]search.Searcher, 0, 25)
+
+	for _, cterm := range candidateTerms {
+		qsearcher, err := NewTermSearcher(indexReader, cterm, field, boost, explain)
+		if err != nil {
+			return nil, err
+		}
+		qsearchers = append(qsearchers, qsearcher)
+	}
+
+	// build disjunction searcher of these ranges
+	searcher, err := NewDisjunctionSearcher(indexReader, qsearchers, 0, explain)
+	if err != nil {
+		return nil, err
+	}
+
+	return &FuzzySearcher{
+		indexReader: indexReader,
+		term:        term,
+		prefix:      prefix,
+		fuzziness:   fuzziness,
+		field:       field,
+		explain:     explain,
+		searcher:    searcher,
+	}, nil
+}
+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() (*search.DocumentMatch, error) {
+	return s.searcher.Next()
+
+}
+
+func (s *FuzzySearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	return s.searcher.Next()
+}
+
+func (s *FuzzySearcher) Close() error {
+	return s.searcher.Close()
+}
+
+func (s *FuzzySearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_match_all.go

@@ -0,0 +1,89 @@
+//  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 searchers
+
+import (
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+	"github.com/blevesearch/bleve/search/scorers"
+)
+
+type MatchAllSearcher struct {
+	indexReader index.IndexReader
+	reader      index.DocIDReader
+	scorer      *scorers.ConstantScorer
+}
+
+func NewMatchAllSearcher(indexReader index.IndexReader, boost float64, explain bool) (*MatchAllSearcher, error) {
+	reader, err := indexReader.DocIDReader("", "")
+	if err != nil {
+		return nil, err
+	}
+	scorer := scorers.NewConstantScorer(1.0, boost, explain)
+	return &MatchAllSearcher{
+		indexReader: indexReader,
+		reader:      reader,
+		scorer:      scorer,
+	}, nil
+}
+
+func (s *MatchAllSearcher) Count() uint64 {
+	return s.indexReader.DocCount()
+}
+
+func (s *MatchAllSearcher) Weight() float64 {
+	return s.scorer.Weight()
+}
+
+func (s *MatchAllSearcher) SetQueryNorm(qnorm float64) {
+	s.scorer.SetQueryNorm(qnorm)
+}
+
+func (s *MatchAllSearcher) Next() (*search.DocumentMatch, error) {
+	id, err := s.reader.Next()
+	if err != nil {
+		return nil, err
+	}
+
+	if id == "" {
+		return nil, nil
+	}
+
+	// score match
+	docMatch := s.scorer.Score(id)
+	// return doc match
+	return docMatch, nil
+
+}
+
+func (s *MatchAllSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	id, err := s.reader.Advance(ID)
+	if err != nil {
+		return nil, err
+	}
+
+	if id == "" {
+		return nil, nil
+	}
+
+	// score match
+	docMatch := s.scorer.Score(id)
+
+	// return doc match
+	return docMatch, nil
+}
+
+func (s *MatchAllSearcher) Close() error {
+	return s.reader.Close()
+}
+
+func (s *MatchAllSearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_match_none.go

@@ -0,0 +1,53 @@
+//  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 searchers
+
+import (
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+)
+
+type MatchNoneSearcher struct {
+	indexReader index.IndexReader
+}
+
+func NewMatchNoneSearcher(indexReader index.IndexReader) (*MatchNoneSearcher, error) {
+	return &MatchNoneSearcher{
+		indexReader: indexReader,
+	}, nil
+}
+
+func (s *MatchNoneSearcher) Count() uint64 {
+	return uint64(0)
+}
+
+func (s *MatchNoneSearcher) Weight() float64 {
+	return 0.0
+}
+
+func (s *MatchNoneSearcher) SetQueryNorm(qnorm float64) {
+
+}
+
+func (s *MatchNoneSearcher) Next() (*search.DocumentMatch, error) {
+	return nil, nil
+}
+
+func (s *MatchNoneSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	return nil, nil
+}
+
+func (s *MatchNoneSearcher) Close() error {
+	return nil
+}
+
+func (s *MatchNoneSearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_numeric_range.go

@@ -0,0 +1,214 @@
+//  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 searchers
+
+import (
+	"bytes"
+	"math"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/numeric_util"
+	"github.com/blevesearch/bleve/search"
+)
+
+type NumericRangeSearcher struct {
+	indexReader index.IndexReader
+	min         *float64
+	max         *float64
+	field       string
+	explain     bool
+	searcher    *DisjunctionSearcher
+}
+
+func NewNumericRangeSearcher(indexReader index.IndexReader, min *float64, max *float64, inclusiveMin, inclusiveMax *bool, field string, boost float64, explain bool) (*NumericRangeSearcher, error) {
+	// account for unbounded edges
+	if min == nil {
+		negInf := math.Inf(-1)
+		min = &negInf
+	}
+	if max == nil {
+		Inf := math.Inf(1)
+		max = &Inf
+	}
+	if inclusiveMin == nil {
+		defaultInclusiveMin := true
+		inclusiveMin = &defaultInclusiveMin
+	}
+	if inclusiveMax == nil {
+		defaultInclusiveMax := false
+		inclusiveMax = &defaultInclusiveMax
+	}
+	// find all the ranges
+	minInt64 := numeric_util.Float64ToInt64(*min)
+	if !*inclusiveMin && minInt64 != math.MaxInt64 {
+		minInt64++
+	}
+	maxInt64 := numeric_util.Float64ToInt64(*max)
+	if !*inclusiveMax && maxInt64 != math.MinInt64 {
+		maxInt64--
+	}
+	// FIXME hard-coded precision, should match field declaration
+	termRanges := splitInt64Range(minInt64, maxInt64, 4)
+	terms := termRanges.Enumerate()
+	// enumerate all the terms in the range
+	qsearchers := make([]search.Searcher, len(terms))
+	for i, term := range terms {
+		var err error
+		qsearchers[i], err = NewTermSearcher(indexReader, string(term), field, boost, explain)
+		if err != nil {
+			return nil, err
+		}
+	}
+	// build disjunction searcher of these ranges
+	searcher, err := NewDisjunctionSearcher(indexReader, qsearchers, 0, explain)
+	if err != nil {
+		return nil, err
+	}
+	return &NumericRangeSearcher{
+		indexReader: indexReader,
+		min:         min,
+		max:         max,
+		field:       field,
+		explain:     explain,
+		searcher:    searcher,
+	}, nil
+}
+
+func (s *NumericRangeSearcher) Count() uint64 {
+	return s.searcher.Count()
+}
+
+func (s *NumericRangeSearcher) Weight() float64 {
+	return s.searcher.Weight()
+}
+
+func (s *NumericRangeSearcher) SetQueryNorm(qnorm float64) {
+	s.searcher.SetQueryNorm(qnorm)
+}
+
+func (s *NumericRangeSearcher) Next() (*search.DocumentMatch, error) {
+	return s.searcher.Next()
+}
+
+func (s *NumericRangeSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	return s.searcher.Advance(ID)
+}
+
+func (s *NumericRangeSearcher) Close() error {
+	return s.searcher.Close()
+}
+
+type termRange struct {
+	startTerm []byte
+	endTerm   []byte
+}
+
+func (t *termRange) Enumerate() [][]byte {
+	rv := make([][]byte, 0)
+	next := t.startTerm
+	for bytes.Compare(next, t.endTerm) <= 0 {
+		rv = append(rv, next)
+		next = incrementBytes(next)
+	}
+	return rv
+}
+
+func incrementBytes(in []byte) []byte {
+	rv := make([]byte, len(in))
+	copy(rv, in)
+	for i := len(rv) - 1; i >= 0; i-- {
+		rv[i] = rv[i] + 1
+		if rv[i] != 0 {
+			// didn't overflow, so stop
+			break
+		}
+	}
+	return rv
+}
+
+type termRanges []*termRange
+
+func (tr termRanges) Enumerate() [][]byte {
+	rv := make([][]byte, 0)
+	for _, tri := range tr {
+		trie := tri.Enumerate()
+		rv = append(rv, trie...)
+	}
+	return rv
+}
+
+func splitInt64Range(minBound, maxBound int64, precisionStep uint) termRanges {
+	rv := make(termRanges, 0)
+	if minBound > maxBound {
+		return rv
+	}
+
+	for shift := uint(0); ; shift += precisionStep {
+
+		diff := int64(1) << (shift + precisionStep)
+		mask := ((int64(1) << precisionStep) - int64(1)) << shift
+		hasLower := (minBound & mask) != int64(0)
+		hasUpper := (maxBound & mask) != mask
+
+		var nextMinBound int64
+		if hasLower {
+			nextMinBound = (minBound + diff) &^ mask
+		} else {
+			nextMinBound = minBound &^ mask
+		}
+		var nextMaxBound int64
+		if hasUpper {
+			nextMaxBound = (maxBound - diff) &^ mask
+		} else {
+			nextMaxBound = maxBound &^ mask
+		}
+
+		lowerWrapped := nextMinBound < minBound
+		upperWrapped := nextMaxBound > maxBound
+
+		if shift+precisionStep >= 64 || nextMinBound > nextMaxBound || lowerWrapped || upperWrapped {
+			// We are in the lowest precision or the next precision is not available.
+			rv = append(rv, newRange(minBound, maxBound, shift))
+			// exit the split recursion loop
+			break
+		}
+
+		if hasLower {
+			rv = append(rv, newRange(minBound, minBound|mask, shift))
+		}
+		if hasUpper {
+			rv = append(rv, newRange(maxBound&^mask, maxBound, shift))
+		}
+
+		// recurse to next precision
+		minBound = nextMinBound
+		maxBound = nextMaxBound
+	}
+
+	return rv
+}
+
+func newRange(minBound, maxBound int64, shift uint) *termRange {
+	maxBound |= (int64(1) << shift) - int64(1)
+	minBytes := numeric_util.MustNewPrefixCodedInt64(minBound, shift)
+	maxBytes := numeric_util.MustNewPrefixCodedInt64(maxBound, shift)
+	return newRangeBytes(minBytes, maxBytes)
+}
+
+func newRangeBytes(minBytes, maxBytes []byte) *termRange {
+	return &termRange{
+		startTerm: minBytes,
+		endTerm:   maxBytes,
+	}
+}
+
+func (s *NumericRangeSearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_phrase.go

@@ -0,0 +1,197 @@
+//  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 searchers
+
+import (
+	"math"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+)
+
+type PhraseSearcher struct {
+	initialized  bool
+	indexReader  index.IndexReader
+	mustSearcher *ConjunctionSearcher
+	queryNorm    float64
+	currMust     *search.DocumentMatch
+	slop         int
+	terms        []string
+}
+
+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() error {
+	var err error
+	// get all searchers pointing at their first match
+	if s.mustSearcher != nil {
+		s.currMust, err = s.mustSearcher.Next()
+		if err != nil {
+			return err
+		}
+	}
+
+	s.initialized = true
+	return nil
+}
+
+func (s *PhraseSearcher) advanceNextMust() error {
+	var err error
+
+	if s.mustSearcher != nil {
+		s.currMust, err = s.mustSearcher.Next()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *PhraseSearcher) Weight() float64 {
+	var rv float64
+	rv += s.mustSearcher.Weight()
+
+	return rv
+}
+
+func (s *PhraseSearcher) SetQueryNorm(qnorm float64) {
+	s.mustSearcher.SetQueryNorm(qnorm)
+}
+
+func (s *PhraseSearcher) Next() (*search.DocumentMatch, error) {
+	if !s.initialized {
+		err := s.initSearchers()
+		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()
+			if err != nil {
+				return nil, err
+			}
+			return rv, nil
+		}
+
+		err := s.advanceNextMust()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return nil, nil
+}
+
+func (s *PhraseSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	if !s.initialized {
+		err := s.initSearchers()
+		if err != nil {
+			return nil, err
+		}
+	}
+	var err error
+	s.currMust, err = s.mustSearcher.Advance(ID)
+	if err != nil {
+		return nil, err
+	}
+	return s.Next()
+}
+
+func (s *PhraseSearcher) Count() uint64 {
+	// for now return a worst case
+	var sum uint64
+	sum += s.mustSearcher.Count()
+	return sum
+}
+
+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
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_regexp.go

@@ -0,0 +1,113 @@
+//  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 searchers
+
+import (
+	"regexp"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+)
+
+type RegexpSearcher struct {
+	indexReader index.IndexReader
+	pattern     *regexp.Regexp
+	field       string
+	explain     bool
+	searcher    *DisjunctionSearcher
+}
+
+func NewRegexpSearcher(indexReader index.IndexReader, pattern *regexp.Regexp, field string, boost float64, explain bool) (*RegexpSearcher, error) {
+
+	prefixTerm, complete := pattern.LiteralPrefix()
+	candidateTerms := make([]string, 0)
+	if complete {
+		// there is no pattern
+		candidateTerms = append(candidateTerms, prefixTerm)
+	} else {
+		var fieldDict index.FieldDict
+		var err error
+		if len(prefixTerm) > 0 {
+			fieldDict, err = indexReader.FieldDictPrefix(field, []byte(prefixTerm))
+		} else {
+			fieldDict, err = indexReader.FieldDict(field)
+		}
+
+		// enumerate the terms and check against regexp
+		tfd, err := fieldDict.Next()
+		for err == nil && tfd != nil {
+			if pattern.MatchString(tfd.Term) {
+				candidateTerms = append(candidateTerms, tfd.Term)
+			}
+			tfd, err = fieldDict.Next()
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		err = fieldDict.Close()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// enumerate all the terms in the range
+	qsearchers := make([]search.Searcher, 0, 25)
+
+	for _, cterm := range candidateTerms {
+		qsearcher, err := NewTermSearcher(indexReader, cterm, field, boost, explain)
+		if err != nil {
+			return nil, err
+		}
+		qsearchers = append(qsearchers, qsearcher)
+	}
+
+	// build disjunction searcher of these ranges
+	searcher, err := NewDisjunctionSearcher(indexReader, qsearchers, 0, explain)
+	if err != nil {
+		return nil, err
+	}
+
+	return &RegexpSearcher{
+		indexReader: indexReader,
+		pattern:     pattern,
+		field:       field,
+		explain:     explain,
+		searcher:    searcher,
+	}, nil
+}
+func (s *RegexpSearcher) Count() uint64 {
+	return s.searcher.Count()
+}
+
+func (s *RegexpSearcher) Weight() float64 {
+	return s.searcher.Weight()
+}
+
+func (s *RegexpSearcher) SetQueryNorm(qnorm float64) {
+	s.searcher.SetQueryNorm(qnorm)
+}
+
+func (s *RegexpSearcher) Next() (*search.DocumentMatch, error) {
+	return s.searcher.Next()
+
+}
+
+func (s *RegexpSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	return s.searcher.Next()
+}
+
+func (s *RegexpSearcher) Close() error {
+	return s.searcher.Close()
+}
+
+func (s *RegexpSearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_term.go

@@ -0,0 +1,95 @@
+//  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 searchers
+
+import (
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+	"github.com/blevesearch/bleve/search/scorers"
+)
+
+type TermSearcher struct {
+	indexReader index.IndexReader
+	term        string
+	field       string
+	explain     bool
+	reader      index.TermFieldReader
+	scorer      *scorers.TermQueryScorer
+}
+
+func NewTermSearcher(indexReader index.IndexReader, term string, field string, boost float64, explain bool) (*TermSearcher, error) {
+	reader, err := indexReader.TermFieldReader([]byte(term), field)
+	if err != nil {
+		return nil, err
+	}
+	scorer := scorers.NewTermQueryScorer(term, field, boost, indexReader.DocCount(), reader.Count(), explain)
+	return &TermSearcher{
+		indexReader: indexReader,
+		term:        term,
+		field:       field,
+		explain:     explain,
+		reader:      reader,
+		scorer:      scorer,
+	}, nil
+}
+
+func (s *TermSearcher) Count() uint64 {
+	return s.reader.Count()
+}
+
+func (s *TermSearcher) Weight() float64 {
+	return s.scorer.Weight()
+}
+
+func (s *TermSearcher) SetQueryNorm(qnorm float64) {
+	s.scorer.SetQueryNorm(qnorm)
+}
+
+func (s *TermSearcher) Next() (*search.DocumentMatch, error) {
+	termMatch, err := s.reader.Next()
+	if err != nil {
+		return nil, err
+	}
+
+	if termMatch == nil {
+		return nil, nil
+	}
+
+	// score match
+	docMatch := s.scorer.Score(termMatch)
+	// return doc match
+	return docMatch, nil
+
+}
+
+func (s *TermSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	termMatch, err := s.reader.Advance(ID)
+	if err != nil {
+		return nil, err
+	}
+
+	if termMatch == nil {
+		return nil, nil
+	}
+
+	// score match
+	docMatch := s.scorer.Score(termMatch)
+
+	// return doc match
+	return docMatch, nil
+}
+
+func (s *TermSearcher) Close() error {
+	return s.reader.Close()
+}
+
+func (s *TermSearcher) Min() int {
+	return 0
+}

vendor/github.com/blevesearch/bleve/search/searchers/search_term_prefix.go

@@ -0,0 +1,88 @@
+//  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 searchers
+
+import (
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/search"
+)
+
+type TermPrefixSearcher struct {
+	indexReader index.IndexReader
+	prefix      string
+	field       string
+	explain     bool
+	searcher    *DisjunctionSearcher
+}
+
+func NewTermPrefixSearcher(indexReader index.IndexReader, prefix string, field string, boost float64, explain bool) (*TermPrefixSearcher, error) {
+	// find the terms with this prefix
+	fieldDict, err := indexReader.FieldDictPrefix(field, []byte(prefix))
+
+	// enumerate all the terms in the range
+	qsearchers := make([]search.Searcher, 0, 25)
+	tfd, err := fieldDict.Next()
+	for err == nil && tfd != nil {
+		var qsearcher *TermSearcher
+		qsearcher, err = NewTermSearcher(indexReader, string(tfd.Term), field, 1.0, explain)
+		if err != nil {
+			return nil, err
+		}
+		qsearchers = append(qsearchers, qsearcher)
+		tfd, err = fieldDict.Next()
+	}
+
+	err = fieldDict.Close()
+	if err != nil {
+		return nil, err
+	}
+
+	// build disjunction searcher of these ranges
+	searcher, err := NewDisjunctionSearcher(indexReader, qsearchers, 0, explain)
+	if err != nil {
+		return nil, err
+	}
+
+	return &TermPrefixSearcher{
+		indexReader: indexReader,
+		prefix:      prefix,
+		field:       field,
+		explain:     explain,
+		searcher:    searcher,
+	}, nil
+}
+func (s *TermPrefixSearcher) Count() uint64 {
+	return s.searcher.Count()
+}
+
+func (s *TermPrefixSearcher) Weight() float64 {
+	return s.searcher.Weight()
+}
+
+func (s *TermPrefixSearcher) SetQueryNorm(qnorm float64) {
+	s.searcher.SetQueryNorm(qnorm)
+}
+
+func (s *TermPrefixSearcher) Next() (*search.DocumentMatch, error) {
+	return s.searcher.Next()
+
+}
+
+func (s *TermPrefixSearcher) Advance(ID string) (*search.DocumentMatch, error) {
+	return s.searcher.Next()
+}
+
+func (s *TermPrefixSearcher) Close() error {
+	return s.searcher.Close()
+}
+
+func (s *TermPrefixSearcher) Min() int {
+	return 0
+}