import std.stdio; import dyaml; struct Color { ubyte red; ubyte green; ubyte blue; const int opCmp(ref const Color c) { if(red != c.red) {return red - c.red;} if(green != c.green){return green - c.green;} if(blue != c.blue) {return blue - c.blue;} return 0; } } Node representColor(ref Node node, Representer representer) @safe { //The node is guaranteed to be Color as we add representer for Color. Color color = node.as!Color; static immutable hex = "0123456789ABCDEF"; //Using the color format from the Constructor example. string scalar; foreach(channel; [color.red, color.green, color.blue]) { scalar ~= hex[channel / 16]; scalar ~= hex[channel % 16]; } //Representing as a scalar, with custom tag to specify this data type. return representer.representScalar("!color", scalar); } void main() { try { auto representer = new Representer; representer.addRepresenter!Color(&representColor); auto resolver = new Resolver; import std.regex; resolver.addImplicitResolver("!color", std.regex.regex("[0-9a-fA-F]{6}"), "0123456789abcdefABCDEF"); auto dumper = Dumper("output.yaml"); dumper.representer = representer; dumper.resolver = resolver; auto document = Node([Color(255, 0, 0), Color(0, 255, 0), Color(0, 0, 255)]); dumper.dump(document); } catch(YAMLException e) { writeln(e.msg); } }