The Yoix^® Scripting Language

import yoix.stdio.*;
import yoix.type.*;

Element  e1;
Element  e2 = new Graph { String name = "g"; };
Element  e3 = new Node { String name = "n"; Graph parent = e2; };
Element  e4 = new Edge {
    String name = "e";
    Node tail = e3;
    Node head = e3;
    Graph parent = e2;
};

type(e) {

    if (e == NULL)
	return(toString(e));
    else if (isNode(e))
	return("Node");
    else if (isEdge(e))
	return("Edge");
    else if (isGraph(e))
	return("Graph");

    return("ERROR!");
}

printf("e1=%s, e2=%s, e3=%s, e4=%s\n",
       type(e1), type(e2), type(e3), type(e4));
e1 = e2;
e2 = e3;
e3 = e4;
e4 = NULL;
printf("e1=%s, e2=%s, e3=%s, e4=%s\n",
       type(e1), type(e2), type(e3), type(e4));
printf("The graph is:\n%sor:\n%s",
       e1.text(), e1.text(yoix.graph.DOT));

e1=NULL:Element, e2=Graph, e3=Node, e4=Edge
e1=Graph, e2=Node, e3=Edge, e4=NULL:Element
The graph is:
<graph name=g>
    <node name=n />
    <edge name=e tail=n head=n />
</graph>
or:
graph g {
    n;
    n -- n;
}