360 lines
10 KiB
Go
360 lines
10 KiB
Go
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// Copyright 2012-present Oliver Eilhard. All rights reserved.
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// Use of this source code is governed by a MIT-license.
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// See http://olivere.mit-license.org/license.txt for details.
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package elastic
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import "errors"
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// CompletionSuggester is a fast suggester for e.g. type-ahead completion.
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//
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// See https://www.elastic.co/guide/en/elasticsearch/reference/6.2/search-suggesters-completion.html
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// for more details.
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type CompletionSuggester struct {
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Suggester
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name string
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text string
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prefix string
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regex string
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field string
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analyzer string
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size *int
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shardSize *int
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contextQueries []SuggesterContextQuery
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payload interface{}
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fuzzyOptions *FuzzyCompletionSuggesterOptions
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regexOptions *RegexCompletionSuggesterOptions
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skipDuplicates *bool
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}
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// Creates a new completion suggester.
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func NewCompletionSuggester(name string) *CompletionSuggester {
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return &CompletionSuggester{
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name: name,
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}
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}
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func (q *CompletionSuggester) Name() string {
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return q.name
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}
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func (q *CompletionSuggester) Text(text string) *CompletionSuggester {
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q.text = text
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return q
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}
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func (q *CompletionSuggester) Prefix(prefix string) *CompletionSuggester {
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q.prefix = prefix
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return q
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}
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func (q *CompletionSuggester) PrefixWithEditDistance(prefix string, editDistance interface{}) *CompletionSuggester {
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q.prefix = prefix
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q.fuzzyOptions = NewFuzzyCompletionSuggesterOptions().EditDistance(editDistance)
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return q
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}
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func (q *CompletionSuggester) PrefixWithOptions(prefix string, options *FuzzyCompletionSuggesterOptions) *CompletionSuggester {
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q.prefix = prefix
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q.fuzzyOptions = options
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return q
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}
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func (q *CompletionSuggester) FuzzyOptions(options *FuzzyCompletionSuggesterOptions) *CompletionSuggester {
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q.fuzzyOptions = options
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return q
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}
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func (q *CompletionSuggester) Fuzziness(fuzziness interface{}) *CompletionSuggester {
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if q.fuzzyOptions == nil {
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q.fuzzyOptions = NewFuzzyCompletionSuggesterOptions()
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}
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q.fuzzyOptions = q.fuzzyOptions.EditDistance(fuzziness)
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return q
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}
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func (q *CompletionSuggester) Regex(regex string) *CompletionSuggester {
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q.regex = regex
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return q
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}
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func (q *CompletionSuggester) RegexWithOptions(regex string, options *RegexCompletionSuggesterOptions) *CompletionSuggester {
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q.regex = regex
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q.regexOptions = options
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return q
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}
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func (q *CompletionSuggester) RegexOptions(options *RegexCompletionSuggesterOptions) *CompletionSuggester {
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q.regexOptions = options
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return q
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}
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func (q *CompletionSuggester) SkipDuplicates(skipDuplicates bool) *CompletionSuggester {
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q.skipDuplicates = &skipDuplicates
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return q
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}
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func (q *CompletionSuggester) Field(field string) *CompletionSuggester {
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q.field = field
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return q
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}
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func (q *CompletionSuggester) Analyzer(analyzer string) *CompletionSuggester {
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q.analyzer = analyzer
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return q
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}
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func (q *CompletionSuggester) Size(size int) *CompletionSuggester {
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q.size = &size
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return q
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}
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func (q *CompletionSuggester) ShardSize(shardSize int) *CompletionSuggester {
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q.shardSize = &shardSize
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return q
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}
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func (q *CompletionSuggester) ContextQuery(query SuggesterContextQuery) *CompletionSuggester {
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q.contextQueries = append(q.contextQueries, query)
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return q
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}
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func (q *CompletionSuggester) ContextQueries(queries ...SuggesterContextQuery) *CompletionSuggester {
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q.contextQueries = append(q.contextQueries, queries...)
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return q
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}
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// completionSuggesterRequest is necessary because the order in which
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// the JSON elements are routed to Elasticsearch is relevant.
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// We got into trouble when using plain maps because the text element
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// needs to go before the completion element.
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type completionSuggesterRequest struct {
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Text string `json:"text,omitempty"`
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Prefix string `json:"prefix,omitempty"`
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Regex string `json:"regex,omitempty"`
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Completion interface{} `json:"completion,omitempty"`
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}
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// Source creates the JSON data for the completion suggester.
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func (q *CompletionSuggester) Source(includeName bool) (interface{}, error) {
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cs := &completionSuggesterRequest{}
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if q.text != "" {
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cs.Text = q.text
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}
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if q.prefix != "" {
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cs.Prefix = q.prefix
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}
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if q.regex != "" {
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cs.Regex = q.regex
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}
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suggester := make(map[string]interface{})
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cs.Completion = suggester
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if q.analyzer != "" {
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suggester["analyzer"] = q.analyzer
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}
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if q.field != "" {
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suggester["field"] = q.field
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}
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if q.size != nil {
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suggester["size"] = *q.size
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}
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if q.shardSize != nil {
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suggester["shard_size"] = *q.shardSize
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}
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switch len(q.contextQueries) {
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case 0:
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case 1:
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src, err := q.contextQueries[0].Source()
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if err != nil {
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return nil, err
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}
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suggester["contexts"] = src
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default:
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ctxq := make(map[string]interface{})
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for _, query := range q.contextQueries {
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src, err := query.Source()
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if err != nil {
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return nil, err
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}
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// Merge the dictionary into ctxq
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m, ok := src.(map[string]interface{})
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if !ok {
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return nil, errors.New("elastic: context query is not a map")
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}
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for k, v := range m {
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ctxq[k] = v
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}
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}
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suggester["contexts"] = ctxq
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}
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// Fuzzy options
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if q.fuzzyOptions != nil {
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src, err := q.fuzzyOptions.Source()
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if err != nil {
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return nil, err
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}
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suggester["fuzzy"] = src
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}
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// Regex options
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if q.regexOptions != nil {
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src, err := q.regexOptions.Source()
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if err != nil {
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return nil, err
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}
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suggester["regex"] = src
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}
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if q.skipDuplicates != nil {
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suggester["skip_duplicates"] = *q.skipDuplicates
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}
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// TODO(oe) Add completion-suggester specific parameters here
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if !includeName {
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return cs, nil
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}
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source := make(map[string]interface{})
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source[q.name] = cs
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return source, nil
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}
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// -- Fuzzy options --
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// FuzzyCompletionSuggesterOptions represents the options for fuzzy completion suggester.
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type FuzzyCompletionSuggesterOptions struct {
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editDistance interface{}
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transpositions *bool
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minLength *int
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prefixLength *int
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unicodeAware *bool
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maxDeterminizedStates *int
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}
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// NewFuzzyCompletionSuggesterOptions initializes a new FuzzyCompletionSuggesterOptions instance.
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func NewFuzzyCompletionSuggesterOptions() *FuzzyCompletionSuggesterOptions {
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return &FuzzyCompletionSuggesterOptions{}
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}
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// EditDistance specifies the maximum number of edits, e.g. a number like "1" or "2"
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// or a string like "0..2" or ">5".
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//
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// See https://www.elastic.co/guide/en/elasticsearch/reference/6.2/common-options.html#fuzziness
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// for details.
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func (o *FuzzyCompletionSuggesterOptions) EditDistance(editDistance interface{}) *FuzzyCompletionSuggesterOptions {
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o.editDistance = editDistance
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return o
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}
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// Transpositions, if set to true, are counted as one change instead of two (defaults to true).
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func (o *FuzzyCompletionSuggesterOptions) Transpositions(transpositions bool) *FuzzyCompletionSuggesterOptions {
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o.transpositions = &transpositions
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return o
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}
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// MinLength represents the minimum length of the input before fuzzy suggestions are returned (defaults to 3).
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func (o *FuzzyCompletionSuggesterOptions) MinLength(minLength int) *FuzzyCompletionSuggesterOptions {
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o.minLength = &minLength
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return o
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}
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// PrefixLength represents the minimum length of the input, which is not checked for
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// fuzzy alternatives (defaults to 1).
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func (o *FuzzyCompletionSuggesterOptions) PrefixLength(prefixLength int) *FuzzyCompletionSuggesterOptions {
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o.prefixLength = &prefixLength
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return o
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}
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// UnicodeAware, if true, all measurements (like fuzzy edit distance, transpositions, and lengths)
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// are measured in Unicode code points instead of in bytes. This is slightly slower than
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// raw bytes, so it is set to false by default.
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func (o *FuzzyCompletionSuggesterOptions) UnicodeAware(unicodeAware bool) *FuzzyCompletionSuggesterOptions {
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o.unicodeAware = &unicodeAware
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return o
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}
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// MaxDeterminizedStates is currently undocumented in Elasticsearch. It represents
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// the maximum automaton states allowed for fuzzy expansion.
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func (o *FuzzyCompletionSuggesterOptions) MaxDeterminizedStates(max int) *FuzzyCompletionSuggesterOptions {
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o.maxDeterminizedStates = &max
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return o
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}
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// Source creates the JSON data.
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func (o *FuzzyCompletionSuggesterOptions) Source() (interface{}, error) {
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out := make(map[string]interface{})
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if o.editDistance != nil {
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out["fuzziness"] = o.editDistance
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}
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if o.transpositions != nil {
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out["transpositions"] = *o.transpositions
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}
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if o.minLength != nil {
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out["min_length"] = *o.minLength
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}
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if o.prefixLength != nil {
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out["prefix_length"] = *o.prefixLength
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}
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if o.unicodeAware != nil {
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out["unicode_aware"] = *o.unicodeAware
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}
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if o.maxDeterminizedStates != nil {
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out["max_determinized_states"] = *o.maxDeterminizedStates
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}
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return out, nil
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}
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// -- Regex options --
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// RegexCompletionSuggesterOptions represents the options for regex completion suggester.
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type RegexCompletionSuggesterOptions struct {
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flags interface{} // string or int
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maxDeterminizedStates *int
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}
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// NewRegexCompletionSuggesterOptions initializes a new RegexCompletionSuggesterOptions instance.
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func NewRegexCompletionSuggesterOptions() *RegexCompletionSuggesterOptions {
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return &RegexCompletionSuggesterOptions{}
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}
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// Flags represents internal regex flags.
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// Possible flags are ALL (default), ANYSTRING, COMPLEMENT, EMPTY, INTERSECTION, INTERVAL, or NONE.
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//
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// See https://www.elastic.co/guide/en/elasticsearch/reference/6.2/search-suggesters-completion.html#regex
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// for details.
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func (o *RegexCompletionSuggesterOptions) Flags(flags interface{}) *RegexCompletionSuggesterOptions {
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o.flags = flags
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return o
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}
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// MaxDeterminizedStates represents the maximum automaton states allowed for regex expansion.
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//
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// See https://www.elastic.co/guide/en/elasticsearch/reference/6.2/search-suggesters-completion.html#regex
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// for details.
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func (o *RegexCompletionSuggesterOptions) MaxDeterminizedStates(max int) *RegexCompletionSuggesterOptions {
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o.maxDeterminizedStates = &max
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return o
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}
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// Source creates the JSON data.
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func (o *RegexCompletionSuggesterOptions) Source() (interface{}, error) {
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out := make(map[string]interface{})
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if o.flags != nil {
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out["flags"] = o.flags
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}
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if o.maxDeterminizedStates != nil {
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out["max_determinized_states"] = *o.maxDeterminizedStates
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}
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return out, nil
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}
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