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'''
This file is part of PM4Py (More Info: https://pm4py.fit.fraunhofer.de).
PM4Py is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PM4Py is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PM4Py. If not, see <https://www.gnu.org/licenses/>.
'''
from pm4py.objects.petri_net.obj import PetriNet
from typing import Optional, Dict, Any
def apply(petri_net: PetriNet, parameters: Optional[Dict[Any, Any]] = None) -> float:
"""
Computes the extended Cardoso metric as described in the paper:
"Complexity Metrics for Workflow Nets"
Lassen, Kristian Bisgaard, and Wil MP van der Aalst
Parameters
-------------
petri_net
Petri net
Returns
-------------
ext_cardoso_metric
Extended Cardoso metric
"""
if parameters is None:
parameters = {}
ext_card = 0
for place in petri_net.places:
targets = set()
for out_arc in place.out_arcs:
for out_arc2 in out_arc.target.out_arcs:
targets.add(out_arc2.target)
ext_card += len(targets)
return ext_card
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