# File lib/graphviz/theory.rb, line 165 def critical_path return nil if range.include?(nil) or @graph.type != "digraph" r = [ [0, [1]] ] critical_path_recursion( distance_matrix, adjancy_matrix, r, [], 0 ).inject( {:distance => 0, :path => []} ) { |r, item| (r[:distance] < item[0]) ? { :distance => item[0], :path => item[1] } : r } end