模式特點：給定一個語言，定義它的文法的一種表示，并定義一個解釋器，這個解釋器使用該表示來解釋語言中的句子。
我們來看一下下面這樣的程序結構：
|
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
|
class Context: def __init__(self): self.input="" self.output=""class AbstractExpression: def Interpret(self,context): passclass Expression(AbstractExpression): def Interpret(self,context): print "terminal interpret"class NonterminalExpression(AbstractExpression): def Interpret(self,context): print "Nonterminal interpret"if __name__ == "__main__": context= "" c = [] c = c + [Expression()] c = c + [NonterminalExpression()] c = c + [Expression()] c = c + [Expression()] for a in c: a.Interpret(context) |
那么它所體現出的類圖是這樣的：
再來看一個例子：
|
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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
#encoding=utf-8 # #by panda def printInfo(info): print unicode(info, 'utf-8').encode('gbk'), #上下文類：演奏內容 class PlayContext(): text = None PlayText = None #抽象表達式類 class Expression(): def Interpret(self, context): if len(context.PlayText) == 0: return else: playKey = context.PlayText[0:1] context.PlayText = context.PlayText[2:] tmp = context.PlayText.index(' ') #找出第一個空格出現的位置 playValue = context.PlayText[0:tmp] context.PlayText = context.PlayText[tmp+1:] self.Excute(playKey,playValue) def Excute(self,playKey,playValue): pass #音高 class Pitch(Expression): pitch = None def Excute(self, key, value): value = int(value) if value == 1: self.pitch = '低音' elif value == 2: self.pitch = '中音' elif value == 3: self.pitch = '高音' printInfo(self.pitch) #音符 class Note(Expression): Notes = { 'C':1, 'D':2, 'E':3, 'F':4, 'G':5, 'A':6, 'B':7, } note = None def Excute(self, key, value): self.note = self.Notes[key] printInfo('%d' % self.note) def clientUI(): context = PlayContext() context.PlayText = "O 2 E 0.5 G 0.5 A 3 E 0.5 G 0.5 D 3 E 0.5 G 0.5 A 0.5 O 3 C 1 O 2 A 0.5 G 1 C 0.5 E 0.5 D 3 " expression = None; while(len(context.PlayText) > 0): str = context.PlayText[0:1]; if(str == 'O'): expression = Pitch() elif(str == 'C' or str == 'D' or str == 'E' or str == 'F' or str == 'G' or str == 'A' or str == 'B' or str == 'P'): expression = Note() expression.Interpret(context) return if __name__ == '__main__': clientUI(); |
類圖：
