def strongly_connected_components(filepath):
"""
Method to calculate the strongly connected
components in the graph and write it in an output file
Expects: filepath (filename is sufficient if file is in the same
directory else absolute file path is required)
Effects: Generates the output file with name output_filename
in the same directory
"""
generator = GraphGenerator(filepath)
graph = generator.graph_from_text_file()
dfs_1 = DFS(graph)
dfs_1.dfs()
# graph after first run of dfs with vertices ordered by increasing
# finishing time.
dfs_1.dfs_graph_from_call_stack()
# graph after transpose of the original graph
dfs_1_trans_graph = dfs_1.dfs_graph.transpose()
# # Second run of dfs on transposed graph
dfs_2 = DFS(dfs_1_trans_graph)
dfs_2.dfs()
dfs_2.dfs_graph_from_call_stack()
filename = filepath.split("/")[-1]
file_obj = open("output_" + filename, "w")
write_dfs_components(file_obj, dfs_2.dfs_forest)
file_obj.close()
def run_tests(filepath):
"""
runs all the tests for the program
"""
generator = GraphGenerator(filepath)
graph = generator.graph_from_text_file()
# test for object references in original graph
print "TEST: Testing object reference on original graph"
print object_references(graph)
dfs_1 = DFS(graph)
dfs_1.dfs()
# graph after first run of dfs with vertices ordered by increasing
# finishing time.
dfs_1.dfs_graph_from_call_stack()
# test for object reference after first dfs run
print "TEST: Testing object reference on dfs 1 graph"
print object_references(dfs_1.dfs_graph)
print "Printing DFS 1 Graph"
print dfs_1.dfs_graph
print "*****************************************"
# graph after transpose of the original graph
dfs_1_trans_graph = dfs_1.dfs_graph.transpose()
print "Printing transpose of DFS 1 Graph"
print dfs_1_trans_graph
print "*****************************************"
# # Second run of dfs on transposed graph
dfs_2 = DFS(dfs_1_trans_graph)
dfs_2.dfs()
dfs_2.dfs_graph_from_call_stack()
# test for object reference after first dfs run
print "TEST: Testing object reference on dfs 2 graph"
print object_references(dfs_2.dfs_graph)
print "Printing DFS 2 Graph"
print dfs_2.dfs_graph
print "*****************************************"
print "Printing DFS components"
print "*****************************************"
print_dfs_components(dfs_2.dfs_forest)