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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 */