Function parseMutationOp

dql/parser_mutation.go:172–208

parseMutationOp parses and stores set or delete operation string in Mutation.

(it *lex.ItemIterator, op string, mu *api.Mutation)

// parseMutationOp parses and stores set or delete operation string in Mutation.
func parseMutationOp(it *lex.ItemIterator, op string, mu *api.Mutation) error {
	parse := false
	for it.Next() {
		item := it.Item()
		if item.Typ == itemText {
			continue
		}
		if item.Typ == itemLeftCurl {
			if parse {
				return it.Errorf("Too many left curls in set mutation.")
			}
			parse = true
		}
		if item.Typ == itemMutationOpContent {
			if !parse {
				return it.Errorf("Mutation syntax invalid.")
			}

			switch op {
			case "set":
				mu.SetNquads = []byte(item.Val)
			case "delete":
				mu.DelNquads = []byte(item.Val)
			case "schema":
				return it.Errorf("Altering schema not supported through http client.")
			case "dropall":
				return it.Errorf("Dropall not supported through http client.")
			default:
				return it.Errorf("Invalid mutation operation.")
			}
		}
		if item.Typ == itemRightCurl {
			return nil
		}
	}
	return it.Errorf("Invalid mutation formatting.")
}