130242014058+吳偉銘+第2次實驗
阿新 • • 發佈：2017-10-28
ids ctr 狀態 true tro show exp layout 體系
一、實驗目的
1．熟悉體系結構的風格的概念
2．理解和應用管道過濾器型的風格。
3、理解解釋器的原理
4、理解編譯器模型
二、實驗環境
硬件：
軟件：Python或任何一種自己喜歡的語言
三、實驗內容
1、實現“四則運算”的簡易翻譯器。
結果要求：
1）實現加減乘除四則運算，允許同時又多個操作數，如：2+3*5-6 結果是11
2）被操作數為整數，整數可以有多位
3）處理空格
4）輸入錯誤顯示錯誤提示，並返回命令狀態“CALC”
圖1 實驗結果示例
加強練習：
1、有能力的同學，可以嘗試實現賦值語句，例如x=2+3*5-6，返回x=11。（註意：要實現解釋器的功能，而不是只是顯示）
2、嘗試實現自增和自減符號，例如x++
3、采用管道-過濾器（Pipes and Filters）風格實現解釋器
圖2 管道-過濾器風格
圖 3 編譯器模型示意圖
本實驗，實現的是詞法分析和語法分析兩個部分。
import wx # begin wxGlade: extracode # end wxGlade class MyFrame(wx.Frame): def __init__(self, *args, **kwds):# begin wxGlade: MyFrame.__init__ kwds["style"] = wx.DEFAULT_FRAME_STYLE wx.Frame.__init__(self, *args, **kwds) self.text_ctrl_1 = wx.TextCtrl(self, -1, "",style=wx.TE_READONLY) self.button_37 = wx.Button(self, -1, "1") self.button_38 = wx.Button(self, -1, "2") self.button_39 = wx.Button(self, -1, "3") self.button_40 = wx.Button(self, -1, "+") self.button_41 = wx.Button(self, -1, "4") self.button_42 = wx.Button(self, -1, "5") self.button_43 = wx.Button(self, -1, "6") self.button_44 = wx.Button(self, -1, "-") self.button_46 = wx.Button(self, -1, "7") self.button_45 = wx.Button(self, -1, "8") self.button_47 = wx.Button(self, -1, "9") self.button_48 = wx.Button(self, -1, "x") self.button_49 = wx.Button(self, -1, "C") self.button_50 = wx.Button(self, -1, "0") self.button_51 = wx.Button(self, -1, "=") self.button_52 = wx.Button(self, -1, "/") self.__set_properties() self.__do_layout() self.Bind(wx.EVT_BUTTON, self.bu1, self.button_37) self.Bind(wx.EVT_BUTTON, self.bu2, self.button_38) self.Bind(wx.EVT_BUTTON, self.bu3, self.button_39) self.Bind(wx.EVT_BUTTON, self.bu_plus, self.button_40) self.Bind(wx.EVT_BUTTON, self.bu4, self.button_41) self.Bind(wx.EVT_BUTTON, self.bu5, self.button_42) self.Bind(wx.EVT_BUTTON, self.bu6, self.button_43) self.Bind(wx.EVT_BUTTON, self.bu_min, self.button_44) self.Bind(wx.EVT_BUTTON, self.bu7, self.button_46) self.Bind(wx.EVT_BUTTON, self.bu8, self.button_45) self.Bind(wx.EVT_BUTTON, self.bu9, self.button_47) self.Bind(wx.EVT_BUTTON, self.bu_mul, self.button_48) self.Bind(wx.EVT_BUTTON, self.bu_clear, self.button_49) self.Bind(wx.EVT_BUTTON, self.bu0, self.button_50) self.Bind(wx.EVT_BUTTON, self.bu_result, self.button_51) self.Bind(wx.EVT_BUTTON, self.bu_chu, self.button_52) # end wxGlade self.Show(True) def __set_properties(self): # begin wxGlade: MyFrame.__set_properties self.SetTitle("Python Calculater by CYG") self.text_ctrl_1.SetMinSize((400, 50)) self.button_37.SetMinSize((100, 50)) self.button_38.SetMinSize((100, 50)) self.button_39.SetMinSize((100, 50)) self.button_40.SetMinSize((100, 50)) self.button_41.SetMinSize((100, 50)) self.button_42.SetMinSize((100, 50)) self.button_43.SetMinSize((100, 50)) self.button_44.SetMinSize((100, 50)) self.button_46.SetMinSize((100, 50)) self.button_45.SetMinSize((100, 50)) self.button_47.SetMinSize((100, 50)) self.button_48.SetMinSize((100, 50)) self.button_49.SetMinSize((100, 50)) self.button_50.SetMinSize((100, 50)) self.button_51.SetMinSize((100, 50)) self.button_52.SetMinSize((100, 50)) # end wxGlade def __do_layout(self): # begin wxGlade: MyFrame.__do_layout sizer_2 = wx.BoxSizer(wx.VERTICAL) sizer_3 = wx.BoxSizer(wx.VERTICAL) grid_sizer_1 = wx.GridSizer(4, 4, 0, 0) sizer_3.Add(self.text_ctrl_1, 0, 0, 0) grid_sizer_1.Add(self.button_37, 0, 0, 0) grid_sizer_1.Add(self.button_38, 0, 0, 0) grid_sizer_1.Add(self.button_39, 0, 0, 0) grid_sizer_1.Add(self.button_40, 0, 0, 0) grid_sizer_1.Add(self.button_41, 0, 0, 0) grid_sizer_1.Add(self.button_42, 0, 0, 0) grid_sizer_1.Add(self.button_43, 0, 0, 0) grid_sizer_1.Add(self.button_44, 0, 0, 0) grid_sizer_1.Add(self.button_46, 0, 0, 0) grid_sizer_1.Add(self.button_45, 0, 0, 0) grid_sizer_1.Add(self.button_47, 0, 0, 0) grid_sizer_1.Add(self.button_48, 0, 0, 0) grid_sizer_1.Add(self.button_49, 0, 0, 0) grid_sizer_1.Add(self.button_50, 0, 0, 0) grid_sizer_1.Add(self.button_51, 0, 0, 0) grid_sizer_1.Add(self.button_52, 0, 0, 0) sizer_3.Add(grid_sizer_1, 1, wx.EXPAND, 0) sizer_2.Add(sizer_3, 1, wx.EXPAND, 0) self.SetSizer(sizer_2) sizer_2.Fit(self) self.Layout() # end wxGlade def bu1(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("1") event.Skip() def bu2(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("2") event.Skip() def bu3(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("3") event.Skip() def bu_plus(self, event): # wxGlade: MyFrame.<event_handler> self.num1=self.text_ctrl_1.GetValue() self.op="+" self.text_ctrl_1.Clear() event.Skip() def bu4(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("4") event.Skip() def bu5(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("5") event.Skip() def bu6(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("6") event.Skip() def bu_min(self, event): # wxGlade: MyFrame.<event_handler> self.num1=self.text_ctrl_1.GetValue() self.op="-" self.text_ctrl_1.Clear() event.Skip() def bu7(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("7") event.Skip() def bu8(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("8") event.Skip() def bu9(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("9") event.Skip() def bu_mul(self, event): # wxGlade: MyFrame.<event_handler> self.num1=self.text_ctrl_1.GetValue() self.op="x" self.text_ctrl_1.Clear() event.Skip() def bu_clear(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.Clear() event.Skip() def bu0(self, event): # wxGlade: MyFrame.<event_handler> self.text_ctrl_1.AppendText("0") event.Skip() def bu_chu(self, event): # wxGlade: MyFrame.<event_handler> self.num1=self.text_ctrl_1.GetValue() self.op="/" self.text_ctrl_1.Clear() event.Skip() def bu_result(self, event): # wxGlade: MyFrame.<event_handler> self.num2=self.text_ctrl_1.GetValue() num1=int(self.num1) num2=int(self.num2) if self.op=="+": self.text_ctrl_1.SetValue(str(num1+num2)) elif self.op=="-": self.text_ctrl_1.SetValue(str(num1-num2)) elif self.op=="x": self.text_ctrl_1.SetValue(str(num1*num2)) elif self.op=="/": self.text_ctrl_1.SetValue(str(num1/num2)) event.Skip() # end of class MyFrame if __name__ == "__main__": app=wx.App(False) myframe=MyFrame(None) app.MainLoop()
130242014058+吳偉銘+第2次實驗