Expose LabelContext in gremlin

query/gremlin/build_iterator.go

@@ -163,6 +163,12 @@ func buildPathFromObject(obj *otto.Object) *path.Path {
 		return p.InPredicates()
 	case "OutPredicates":
 		return p.OutPredicates()
+	case "LabelContext":
+		labels, tags, ok := getViaData(obj)
+		if !ok {
+			return nil
+		}
+		return p.LabelContextWithTags(tags, labels...)
 	default:
 		panic(fmt.Sprint("Unimplemented Gremlin function", gremlinType))
 	}

query/gremlin/gremlin_test.go

@@ -278,6 +278,13 @@ var testQueries = []struct {
 		`,
 		expect: []string{"are", "follows", "status"},
 	},
+	{
+		message: "traverse using LabelContext",
+		query: `
+			g.V("greg").LabelContext("smart_graph").Out("status").All()
+		`,
+		expect: []string{"smart_person"},
+	},
 }
 
 func runQueryGetTag(g []quad.Quad, query string, tag string) []string {

query/gremlin/traversals.go

@@ -42,6 +42,7 @@ var traversals = []string{
 	"Difference",
 	"InPredicates",
 	"OutPredicates",
+	"LabelContext",
 }
 
 func (wk *worker) embedTraversals(env *otto.Otto, obj *otto.Object) {