pattern/interpret.py at master · heybeachboy/pattern · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
"""
interpreter pattern with Python Code
"""
from abc import abstractmethod,ABCMeta
class Expression(metaclass=ABCMeta):
    @abstractmethod
    def interpret(self, inContext):
        pass

class TerminalExpression(Expression):
    _data = ""
    def __int__(self, inData):
        self._data = inData

    def interpret(self, inContext):
        if inContext.find(self._data) >= 0:
            return True
        return False

class OrExpression(Expression):
    _expr1 = None
    _expr2 = None

    def __init__(self, inExpr1, inExpr2):
        self._expr1 = inExpr1
        self._expr2 = inExpr2

    def interpret(self, inContext):
        return self._expr1.interpret(inContext) or self._expr2.interpret(inContext)


class AndExpression(Expression):
    _expr1 = None
    _expr2 = None

    def __init__(self, inExpr1, inExpr2):
        self._expr1 = inExpr1
        self._expr2 = inExpr2
    def interpret(self, inContext):
        return self._expr1.interpret(inContext) and self._expr2.interpret(inContext)
if __name__ == '__main__':
    # 规则：Robert和John是男性
    def getMaleExpression():
        robert = TerminalExpression("Robert")
        john = TerminalExpression("John")
        return OrExpression(robert,john)
    # 规则：Julie是一个已婚的女性
    def getMarriedWomanExpression():
        julie = TerminalExpression("Julie")
        married = TerminalExpression("Married")
        return AndExpression(julie,married)
    isMale = getMaleExpression()
    isMarriedWoman = getMarriedWomanExpression()
    print("John is male? " + str(isMale.interpret("John")))
    print("Julie is a married women? " + str(isMarriedWoman.interpret("Married Julie")))