lab2

lab2/programm/finite_automaton.py

@@ -0,0 +1,63 @@
+import random
+
+
+class FiniteAutomaton:
+    def __init__(
+        self,
+        transitions: dict[str, list[tuple[str, str]]],
+        initial_state: str,
+        final_states: set[str],
+        alphabet: set[str],
+    ):
+        self.transitions = transitions
+        self.initial_state = initial_state
+        self.final_states = final_states
+        self.alphabet = alphabet
+
+    def _get_next_state(self, current_state: str, char: str) -> str | None:
+        if current_state in self.transitions:
+            for transition, next_state in self.transitions[current_state]:
+                if char in transition:
+                    return next_state
+        return None
+
+    def process_input(self, input_string: str) -> tuple[str, list[str]]:
+        current_state = self.initial_state
+        transitions_path = [current_state]
+
+        for char in input_string:
+            if char not in self.alphabet:
+                return f"Символ '{char}' не из алфавита", transitions_path
+
+            next_state = self._get_next_state(current_state, char)
+
+            if next_state is None:
+                return "Строка не соответствует", transitions_path
+
+            transitions_path.append(next_state)
+            current_state = next_state
+
+        return (
+            "Строка соответствует"
+            if current_state in self.final_states
+            else "Строка не соответствует"
+        ), transitions_path
+
+    def generate_random_string(self, stop_probability: float = 0.3) -> str:
+        result = []
+        current_state = self.initial_state
+
+        while True:
+            if (
+                current_state in self.final_states
+                and random.random() < stop_probability
+            ):
+                break
+
+            transition, next_state = random.choice(self.transitions[current_state])
+
+            char = random.choice(transition)
+            result.append(char)
+            current_state = next_state
+
+        return "".join(result)

lab2/programm/main.py

@@ -0,0 +1,82 @@
+from finite_automaton import FiniteAutomaton
+
+
+def main():
+    alphabet = set("+-0123456789.,eE")
+    initial_state = "S0"
+    final_states = {"S2", "S4", "S7", "S8", "S9"}
+
+    transitions = {
+        "S0": [("+-", "S1"), ("123456789", "S2"), ("0", "S8")],
+        "S1": [("123456789", "S2"), ("0", "S8")],
+        "S2": [("0123456789", "S2"), (".,", "S3"), ("eE", "S5")],
+        "S3": [("0123456789", "S4")],
+        "S4": [("0123456789", "S4"), ("eE", "S5")],
+        "S5": [("+-", "S6"), ("123456789", "S7"), ("0", "S9")],
+        "S6": [("123456789", "S7"), ("0", "S9")],
+        "S7": [("0123456789", "S7")],
+        "S8": [(".,", "S3")],
+    }
+
+    automaton = FiniteAutomaton(
+        transitions=transitions,
+        initial_state=initial_state,
+        final_states=final_states,
+        alphabet=alphabet,
+    )
+
+    print("Конечный автомат для распознавания форматов вещественных чисел")
+    print("=" * 60)
+    print("Варианты команд:")
+    print(" - check <строка> - проверить, соответствует ли строка автомату")
+    print(
+        " - gen [<вероятность_остановки>] - сгенерировать случайную строку (по умолчанию 0.3)"
+    )
+    print(" - q - выход из программы")
+    print("=" * 60)
+
+    while True:
+        command = input("\nВведите команду: ").strip()
+
+        if not command:
+            continue
+
+        parts = command.split()
+        cmd = parts[0].lower()
+
+        if cmd == "q":
+            print("Выход из программы.")
+            break
+
+        elif cmd == "check":
+            input_string = ""
+            if len(parts) > 1:
+                input_string = " ".join(parts[1:]).strip()
+
+            message, transitions = automaton.process_input(input_string)
+
+            print(f"Результат: {message}")
+            print("Путь переходов:", " -> ".join(transitions))
+
+        elif cmd == "gen":
+            stop_prob = 0.3
+            if len(parts) > 1:
+                try:
+                    stop_prob = float(parts[1])
+                    if not (0 < stop_prob <= 1):
+                        raise ValueError(
+                            "Вероятность должна быть больше 0 и меньше либо равна 1"
+                        )
+                except ValueError as e:
+                    print(f"Ошибка: {e}")
+                    continue
+
+            random_string = automaton.generate_random_string(stop_prob)
+            print(f"Сгенерированная строка: {random_string}")
+
+        else:
+            print(f"Неизвестная команда: {cmd}")
+
+
+if __name__ == "__main__":
+    main()