53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
from typing import TypedDict
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from snanosm.mealy import Machine, TransitionInputEnum
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class Context(TypedDict):
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count: int
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position: int
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matches: int
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def dinc(context: Context):
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context["count"] += 1
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def dset(context: Context):
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context["position"] = context["count"]
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context["count"] += 1
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def dprn(context: Context):
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context["count"] += 1
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print(f"SUBSTRING FOUND AT POSITION: {context['position']}")
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context["matches"] += 1
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# Detects the sequence AB in the string, printing the position and returning the amount of matches
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def detector(input_string: str) -> int:
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initial_context: Context = {
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"count": 0,
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"position": 0,
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"matches": 0,
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}
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m = Machine(initial_context)
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m.add_state("Q0", True, False)
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m.add_state("Q1", False, False)
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m.add_transition("A", "Q0", "Q1", lambda context: dset(context))
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m.add_transition(TransitionInputEnum.MATCH_REST, "Q0", "Q0", lambda context: dinc(context))
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m.add_transition("B", "Q1", "Q0", lambda context: dprn(context))
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m.add_transition(TransitionInputEnum.MATCH_REST, "Q1", "Q0", lambda context: dinc(context))
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for c in input_string:
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m.process_input(c)
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return initial_context["matches"]
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if __name__ == "__main__":
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print("== 1 ==")
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n = detector("AAAAAAABAAAAAB")
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print(f"Matches: {n}")
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print("== 2 ==")
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n = detector("AAAA")
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print(f"Matches: {n}")
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print("== 3 ==")
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n = detector("ABCCBBACAB")
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print(f"Matches: {n}")
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