A library for generating Graphviz DOT language files for graphs.

This code is extracted from the private graphviz library in core rust. It is almost entirely the work of the rust team.

Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option. This file may not be copied, modified, or distributed except according to those terms.