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/* Collapse all nodes with group = X into a single node */
BEG_G {
node_t metaN;
graph_t g = graph ("metagraph", "S");
$tvtype = TV_ne;
$O = g;
}
/* create only one node with given name/value */
N[group == "X"] {
if (!metaN) {
metaN = node (g, $.name);
}
}
/* duplicate all others */
N[group != "X"] { node (g, $.name); }
/* Create an edge only if at least one of the nodes
* is not a collapsed node */
E {
node_t t;
node_t h;
if ($.tail.group == "X") {
if ($.head.group == "X") return;
t = metaN;
h = node (g, $.head.name);
}
else if ($.head.group == "X") {
t = node (g, $.tail.name);
h = metaN;
}
else {
t = node (g, $.tail.name);
h = node (g, $.head.name);
}
edge (t, h, "");
}
/* set g to be output graph */