Function Tuple

pkg/tuple/tuple.go:160–182

Tuple parses a tuple string and returns a Tuple object

(tuple string)

// Tuple parses a tuple string and returns a Tuple object
func Tuple(tuple string) (*base.Tuple, error) {
	s := strings.Split(strings.TrimSpace(tuple), "@") // split tuple string by "@"
	if len(s) != 2 {
		return nil, ErrInvalidTuple // return error if number of "@" is not equal to 2
	}
	ear, err := EAR(s[0]) // parse entity and relation from the first part of the tuple string
	if err != nil {
		return nil, err
	}
	sub, err := EAR(s[1]) // parse entity and relation from the second part of the tuple string
	if err != nil {
		return nil, err
	}
	return &base.Tuple{
		Entity:   ear.Entity,
		Relation: ear.Relation,
		Subject: &base.Subject{
			Type:     sub.Entity.Type,
			Id:       sub.Entity.Id,
			Relation: sub.Relation,
		},
	}, nil
}

// EAR function parses a string to create a base.EntityAndRelation object.
func EAR(ear string) (*base.EntityAndRelation, error) {