Liar design Pattern Python implementation-interpreter mode

Interpreter pattern (interpreter pattern): Given a language, defines a representation of its grammar and defines an interpreter that uses that representation to interpret sentences in the language.

Here is a demo of the Interpreter mode:

1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 4 __author__='Andy'5 """6 Liar design Mode7 design mode-interpreter mode8 interpreter pattern (interpreter pattern): Given a language, defines a representation of its grammar and defines an interpreter that uses that representation to interpret sentences in the language.9 """Ten #abstract an interpreter class One classabstractexpression (object): A  -     defInterpreter (self, context): -         Pass the  - #specific interpreter--terminal inheritance abstract interpreter - classterminalexpression (abstractexpression): -  +     defInterpreter (self, context): -         Print "Terminal Interpreter", Context +  A #specific interpreter--terminal inheritance abstract interpreter at classnotterminalexpression (abstractexpression): -  -     defInterpreter (self, context): -         Print "non-terminal interpreter", Context -  -  in classContext (object): -  to     def __init__(self): +Self.name ="" -  the if __name__=="__main__": *Context =Context () $Context.name ='Andy'Panax NotoginsengArr_list =[Notterminalexpression (), Terminalexpression (), Terminalexpression ()] -      forEntryincharr_list: theEntry.interpreter (context)

The design of the above class is as follows:

When a language needs to be executed and a sentence of that language can be expressed as an abstract syntax tree, you can use the interpreter pattern

Andy
Source: http://www.cnblogs.com/onepiece-andy/
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Liar design Pattern Python implementation-interpreter mode