Ask for location before proximity search

modules/interaction/domain/semantics_test.go

@@ -76,6 +76,15 @@ func TestIndependentRequestParts(t *testing.T) {
 	}
 }
 
+func TestLocalSearchClarification(t *testing.T) {
+	if got := LocalSearchClarification("найди ближайший ресторан"); got == "" {
+		t.Fatal("proximity search without place must ask for location")
+	}
+	if got := LocalSearchClarification("найди ближайший ресторан в Сочи"); got != "" {
+		t.Fatalf("explicit place must proceed, got %q", got)
+	}
+}
+
 func TestTravelSearchClarification(t *testing.T) {
 	if got := TravelSearchClarification("Найди билеты", nil); got == "" {
 		t.Fatal("underspecified travel request must ask for missing route and date")

modules/interaction/domain/travel.go

@@ -47,6 +47,24 @@ func IndependentRequestParts(message string) []string {
 	return result
 }
 
+// LocalSearchClarification prevents a proximity search from silently using a
+// default city when the user did not provide a place.
+func LocalSearchClarification(message string) string {
+	tokens := semanticTokens(StripAssistantVocative(message))
+	if !containsStemInTokens(tokens, "ресторан", "кафе") || !containsStemInTokens(tokens, "ближ", "рядом") {
+		return ""
+	}
+	for index, token := range tokens {
+		if token != "в" && token != "на" && token != "около" && !containsStem(token, "район", "город") {
+			continue
+		}
+		if index+1 < len(tokens) || containsStem(token, "район", "город") {
+			return ""
+		}
+	}
+	return "В каком городе или районе искать ресторан?"
+}
+
 // TravelSearchClarification keeps an incomplete travel request in dialogue
 // instead of reducing it to an unrelated generic web search.
 func TravelSearchClarification(message string, history []interaction.HumanUtterance) string {