class statemachine:
def __init__(self):
self.handlers = {} # 狀態轉移函式字典
self.startstate = none # 初始狀態
self.endstate = # 最終狀態集合
# 引數name為狀態名,handler為狀態轉移函式,end_state表明是否為最終狀態
def add_state(self, name, handler, end_state=0):
name = name.upper()
self.handlers[name] = handler
if end_state:
def set_start(self, name):
self.startstate = name.upper()
def run(self, cargo):
try:
handler = self.handlers[self.startstate]
except:
raise exception("must call .set_start() before .run()")
if not self.endstate:
raise exception("at least one state must be an end_state")
while true:
(newstate, cargo) = handler(cargo)
if newstate.upper() in self.endstate:
print("reached ", newstate)
break
else:
handler = self.handlers[newstate.upper()]
# 有限狀態集合
positive_adjectives = ["great", "super", "fun", "entertaining", "easy"]
negative_adjectives = ["boring", "difficult", "ugly", "bad"]
# 自定義狀態轉變函式
def start_transitions(txt):
# 用指定分隔符對字串進行切片,預設為空格分割,引數num指定分割次數
# 將"python is ***"語句分割為"python"和之後的"is ***"
splitted_txt = txt.split(none, 1)
word, txt = splitted_txt if len(splitted_txt) > 1 else (txt, "")
if word == "python":
newstate = "python_state" # 如果第乙個詞是python則可轉換到"python狀態"
else:
newstate = "error_state" # 如果第乙個詞不是python則進入終止狀態
return (newstate, txt) # 返回新狀態和餘下的語句txt
def python_state_transitions(txt):
splitted_txt = txt.split(none, 1)
word, txt = splitted_txt if len(splitted_txt) > 1 else (txt, "")
if word == "is":
newstate = "is_state"
else:
newstate = "error_state"
return (newstate, txt)
def is_state_transitions(txt):
splitted_txt = txt.split(none, 1)
word, txt = splitted_txt if len(splitted_txt) > 1 else (txt, "")
if word == "not":
newstate = "not_state"
elif word in positive_adjectives:
newstate = "pos_state"
elif word in negative_adjectives:
newstate = "neg_state"
else:
newstate = "error_state"
return (newstate, txt)
def not_state_transitions(txt):
splitted_txt = txt.split(none, 1)
word, txt = splitted_txt if len(splitted_txt) > 1 else (txt, "")
if word in positive_adjectives:
newstate = "neg_state"
elif word in negative_adjectives:
newstate = "pos_state"
else:
newstate = "error_state"
return (newstate, txt)
if __name__ == "__main__":
m = statemachine()
m.add_state("start", start_transitions) # 新增初始狀態
m.add_state("python_state", python_state_transitions)
m.add_state("is_state", is_state_transitions)
m.add_state("not_state", not_state_transitions)
m.add_state("neg_state", none, end_state=1) # 新增最終狀態
m.add_state("pos_state", none, end_state=1)
m.add_state("error_state", none, end_state=1)
m.set_start("start") # 設定開始狀態
m.run("python is great")
m.run("python is not fun")
m.run("perl is ugly")
m.run("pythoniseasy")
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