85 lines
2.5 KiB
Python
85 lines
2.5 KiB
Python
#!/usr/bin/python3
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import sys
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import re
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class automata:
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# class variables init
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def __init__(self):
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# dictionary of connections between nodes
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self.graph = {}
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# list of accepting states
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self.accepting_states = []
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# list of current states
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self.state = ['0']
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# print for debug purposes
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def __repr__(self):
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return('%s\n\n%s\n\n%s\n\n' % (self.graph, self.accepting_states, self.state))
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# add node in open fst format
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def add_node(self, line):
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node = line.replace('\n', '').split(' ')
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if len(node) == 3:
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if node[0] in self.graph:
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# add value to existing node
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self.graph[node[0]].append({node[2]: node[1]})
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else:
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# create new node
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self.graph[node[0]] = [{node[2]: node[1]}]
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elif len(node) == 1:
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# add accepting state
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self.accepting_states.append(node[0])
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# check if string is accepted by automate
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def test_string(self, text):
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self.state = ['0']
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text = text.replace('\n', '')
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# for all values in text
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for i in text:
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# for all actual states
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result = []
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for q in self.state:
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# move state to its transition
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result = self.get_node_transition(q, i)
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# if the list is empty, return false
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if not self.state:
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return False
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# flatten list of states
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self.state = [item for sublist in result for item in sublist]
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# check if automata is in accepting state
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return self.check_if_accepted()
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# check if there is common part between states of automata and accepting states
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def check_if_accepted(self):
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return not set(self.state).isdisjoint(self.accepting_states)
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def get_node_transition(self, q, i):
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result = []
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# if the node exists
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try:
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# search through all its connections to find value
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for connections in self.graph[q]:
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for value in connections:
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if value == i:
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# append next node
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result.append(connections[value])
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except KeyError:
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return result
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# return list of next nodes
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return result
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auto = automata()
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for line in sys.stdin:
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auto.add_node(line)
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f = open(sys.argv[1], 'r')
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for line in f:
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if auto.test_string(line):
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print("TRUE %s" % line)
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else:
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print("FALSE %s" % line)
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