# -*- coding:utf-8 -*-
# file: pyRSS.py
#
import Tkinter
import urllib
import xml.parsers.expat
class MyXML: # XML解析类
  def __init__(self, edit):
    self.parser = xml.parsers.expat.ParserCreate() # 生成XMLParser
    self.parser.StartElementHandler = self.start # 起始标记处理方法
    self.parser.EndElementHandler = self.end # 结束标记处理方法
    self.parser.CharacterDataHandler = self.data # 字符数据处理方法
    self.title = False # 状态标志
    self.description = False
    self.date = False
    self.edit = edit # 多行文本框对象
  def start(self, name, attrs): # 起始标记处理方法
    if name == 'title': # 判断是否为title元素
      self.title = True # 标志设为真
    elif name == 'description':
      self.description = True
    elif name == 'pubDate': # 判断是否为pubDate
      self.date = True # 标志设为真
    else:
      pass
  def end(self, name): # 结束标记处理
    if name == 'title':
      self.title = False # 标志设为假
    elif name == 'description':
      self.description = False
    elif name == 'pubDate':
      self.date = False # 标志设为假
    else:
      pass
  def data(self,data): # 字符数据处理方法
    if self.title: # 根据标志状态输出数据
      self.edit.insert(Tkinter.END,
          '******************************\n')
      self.edit.insert(Tkinter.END, 'Title: ')
      self.edit.insert(Tkinter.END, data + '\n')
    elif self.description:
      self.edit.insert(Tkinter.END, 'Date: ')
      self.edit.insert(Tkinter.END, data + '\n')
    elif self.date:
      self.edit.insert(Tkinter.END, 'Date: ')
      self.edit.insert(Tkinter.END, data + '\n')
    else:
      pass
  def feed(self, data):
    self.parser.Parse(data, 0)
class Window:
  def __init__(self, root):
    self.root = root # 创建组件
    self.entryUrl = Tkinter.Entry(root,width = 30)
    self.entryUrl.place(x = 65, y = 15)
    self.get = Tkinter.Button(root,
        text = '读取RSS', command = self.Get, font = ('system','10'))
    self.get.place(x = 350, y = 15)
    self.frame = Tkinter.Frame(root, bd=2)
    self.scrollbar = Tkinter.Scrollbar(self.frame)
    self.edit = Tkinter.Text(self.frame,yscrollcommand = self.scrollbar.set,
        width = 96, height = 32)
    self.scrollbar.config(command=self.edit.yview)
    self.edit.pack(side = Tkinter.LEFT)
    self.scrollbar.pack(side=Tkinter.RIGHT, fill=Tkinter.Y)
    self.frame.place(y = 50)
  def Get(self):
    url = self.entryUrl.get()
    page = urllib.urlopen(url) # 打开URL
    data = page.read() # 读取URL内容
    parser = MyXML(self.edit) # 生成实例对象
    parser.feed(data) # 处理XML数据
    page.close()
root = Tkinter.Tk()
root.title('RSS 阅读器')
window = Window(root)
root.minsize(700,500)
root.maxsize(700,500)
root.mainloop()