Interpreter.py

#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# @Time    :   2022/08/27 14:32:38
# @Author  :   Gary
# @Email   :   None
class PlayContext():
    # 环境类
    play_text = None


class Expression():
    # 抽象表达式类
    def interpret(self, context):
        if len(context.play_text) == 0:
            return
        else:
            play_segs = context.play_text.split(" ")
            for play_seg in play_segs:
                pos = 0
                for ele in play_seg:
                    if ele.isalpha():
                        pos += 1
                        continue
                    break
                play_chord = play_seg[0:pos]
                play_value = play_seg[pos:]
                self.execute(play_chord, play_value)

    def execute(self, play_key, play_value):
        pass


class NormGuitar(Expression):
    # 具体表达式类
    def execute(self, key, value):
        print("Normal Guitar Playing--Chord:%s Play Tune:%s" % (key, value))


if __name__ == "__main__":
    context = PlayContext()
    context.play_text = "C53231323 Em43231323 F43231323 G63231323"
    guitar = NormGuitar()
    guitar.interpret(context)