def visit(klass, graph):
''' Given a graph, run a topological sort
on the supplied graph and return the results.
:param graph: The graph to perform a topological sort on
:returns: The results of the topological sort
'''
visitor = klass()
graph_dfs_visit(graph, visitor)
return visitor.result
def visit(klass, graph, source, sink):
''' Given a graph, run the path search
on the supplied graph and return the results.
:param graph: The graph to perform a path search on
:param source: The starting point of the search
:param sink: The ending point of the search
:returns: The results of the topological sort
'''
visitor = klass(sink)
graph_dfs_visit(graph, visitor, source)
return visitor.path_exists