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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
#
# Automata object: parse an automata in dot file digraph format into a python object
#
# For further information, see:
# Documentation/trace/rv/deterministic_automata.rst
import ntpath
class Automata:
"""Automata class: Reads a dot file and part it as an automata.
Attributes:
dot_file: A dot file with an state_automaton definition.
"""
invalid_state_str = "INVALID_STATE"
def __init__(self, file_path):
self.__dot_path = file_path
self.name = self.__get_model_name()
self.__dot_lines = self.__open_dot()
self.states, self.initial_state, self.final_states = self.__get_state_variables()
self.events = self.__get_event_variables()
self.function = self.__create_matrix()
def __get_model_name(self):
basename = ntpath.basename(self.__dot_path)
if basename.endswith(".dot") == False:
print("not a dot file")
raise Exception("not a dot file: %s" % self.__dot_path)
model_name = basename[0:-4]
if model_name.__len__() == 0:
raise Exception("not a dot file: %s" % self.__dot_path)
return model_name
def __open_dot(self):
cursor = 0
dot_lines = []
try:
dot_file = open(self.__dot_path)
except:
raise Exception("Cannot open the file: %s" % self.__dot_path)
dot_lines = dot_file.read().splitlines()
dot_file.close()
# checking the first line:
line = dot_lines[cursor].split()
if (line[0] != "digraph") and (line[1] != "state_automaton"):
raise Exception("Not a valid .dot format: %s" % self.__dot_path)
else:
cursor += 1
return dot_lines
def __get_cursor_begin_states(self):
cursor = 0
while self.__dot_lines[cursor].split()[0] != "{node":
cursor += 1
return cursor
def __get_cursor_begin_events(self):
cursor = 0
while self.__dot_lines[cursor].split()[0] != "{node":
cursor += 1
while self.__dot_lines[cursor].split()[0] == "{node":
cursor += 1
# skip initial state transition
cursor += 1
return cursor
def __get_state_variables(self):
# wait for node declaration
states = []
final_states = []
has_final_states = False
cursor = self.__get_cursor_begin_states()
# process nodes
while self.__dot_lines[cursor].split()[0] == "{node":
line = self.__dot_lines[cursor].split()
raw_state = line[-1]
# "enabled_fired"}; -> enabled_fired
state = raw_state.replace('"', '').replace('};', '').replace(',','_')
if state[0:7] == "__init_":
initial_state = state[7:]
else:
states.append(state)
if self.__dot_lines[cursor].__contains__("doublecircle") == True:
final_states.append(state)
has_final_states = True
if self.__dot_lines[cursor].__contains__("ellipse") == True:
final_states.append(state)
has_final_states = True
cursor += 1
states = sorted(set(states))
states.remove(initial_state)
# Insert the initial state at the bein og the states
states.insert(0, initial_state)
if has_final_states == False:
final_states.append(initial_state)
return states, initial_state, final_states
def __get_event_variables(self):
# here we are at the begin of transitions, take a note, we will return later.
cursor = self.__get_cursor_begin_events()
events = []
while self.__dot_lines[cursor][1] == '"':
# transitions have the format:
# "all_fired" -> "both_fired" [ label = "disable_irq" ];
# ------------ event is here ------------^^^^^
if self.__dot_lines[cursor].split()[1] == "->":
line = self.__dot_lines[cursor].split()
event = line[-2].replace('"','')
# when a transition has more than one lables, they are like this
# "local_irq_enable\nhw_local_irq_enable_n"
# so split them.
event = event.replace("\\n", " ")
for i in event.split():
events.append(i)
cursor += 1
return sorted(set(events))
def __create_matrix(self):
# transform the array into a dictionary
events = self.events
states = self.states
events_dict = {}
states_dict = {}
nr_event = 0
for event in events:
events_dict[event] = nr_event
nr_event += 1
nr_state = 0
for state in states:
states_dict[state] = nr_state
nr_state += 1
# declare the matrix....
matrix = [[ self.invalid_state_str for x in range(nr_event)] for y in range(nr_state)]
# and we are back! Let's fill the matrix
cursor = self.__get_cursor_begin_events()
while self.__dot_lines[cursor][1] == '"':
if self.__dot_lines[cursor].split()[1] == "->":
line = self.__dot_lines[cursor].split()
origin_state = line[0].replace('"','').replace(',','_')
dest_state = line[2].replace('"','').replace(',','_')
possible_events = line[-2].replace('"','').replace("\\n", " ")
for event in possible_events.split():
matrix[states_dict[origin_state]][events_dict[event]] = dest_state
cursor += 1
return matrix
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