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grammar_engine.go
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/
grammar_engine.go
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package search
import (
"sort"
"strings"
log "github.com/Sirupsen/logrus"
"github.com/Bnei-Baruch/archive-backend/consts"
"github.com/Bnei-Baruch/archive-backend/utils"
)
type GrammarIntent struct {
LandingPage string `json:"landing_page,omitempty"`
}
func (e *ESEngine) SearchGrammars(query *Query) ([]Intent, error) {
intents := []Intent{}
for _, language := range query.LanguageOrder {
log.Infof("LanguageOrder: %s Grammars: %+v", language, e.grammars)
if grammarByIntent, ok := e.grammars[language]; ok {
log.Infof("grammarByIntent: %+v", grammarByIntent)
for _, grammar := range grammarByIntent {
intent, err := grammar.SearchGrammar(query)
if err != nil {
return []Intent{}, err
}
if intent != nil {
intents = append(intents, *intent)
}
}
}
}
log.Infof("Mached grammars: %+v", intents)
return intents, nil
}
func (g *Grammar) SearchGrammar(query *Query) (*Intent, error) {
if query.Term != "" && len(query.ExactTerms) > 0 {
// Will never match any grammar for query having simple terms and exact terms.
// This is not acurate but an edge case. Need to better think of query representation.
log.Infof("Both term and exact terms are defined, should not trigger: [%s] [%s]", query.Term, strings.Join(query.ExactTerms, " - "))
return nil, nil
}
// Check filters match, i.e., existing query filter match at least one supported grammar intent filter.
if len(query.Filters) > 0 {
common := false
for filterName, values := range query.Filters {
sort.Strings(values)
if grammarValues, ok := g.Filters[filterName]; ok {
sort.Strings(grammarValues)
if len(utils.IntersectSortedStringSlices(values, grammarValues)) > 0 {
common = true
break
}
}
}
if !common {
// No matching filter found, should not trigger intent.
log.Infof("No common filters for intent %s: %+v vs %+v", g.Intent, query.Filters, g.Filters)
return nil, nil
}
}
simpleQuery := query.Term
if simpleQuery == "" && len(query.ExactTerms) == 1 {
simpleQuery = query.ExactTerms[0]
}
for _, pattern := range g.Patterns {
if pattern == simpleQuery {
log.Infof("Matched search [%s] for grammar %s, intent %s for %s. Pattern: %s", query.Original, g.HitType, g.Intent, g.Language, pattern)
return &Intent{Type: consts.GRAMMAR_TYPE_LANDING_PAGE, Language: g.Language, Value: GrammarIntent{LandingPage: g.Intent}}, nil
}
}
return nil, nil
}