expat2.py

python web programming 部分

#!/usr/bin/python
import sys
from xml.parsers import expat

def normalize_whitespace(text):
    return " ".join(text.split())

class SimpleParse:
    def __init__(self):
        self.parser   = expat.ParserCreate()
        self.parser.StartElementHandler = self.start_element
        self.parser.EndElementHandler = self.end_element
        self.parser.CharacterDataHandler = self.character_data
        self.cdata = [ ]
        
    def parse(self,file):
        self.parser.ParseFile(file)

    def print_cdata(self):
        txt = normalize_whitespace("".join(self.cdata))
        if txt: print repr(normalize_whitespace(txt))
        self.cdata = [ ]
        
    def start_element(self,name,attrs):
        self.print_cdata()
        print "Start:",name,attrs
            
    def character_data(self,data):
        self.cdata.append(data)
            
    def end_element(self,name):
        self.print_cdata()        
        print "End:", name

p = SimpleParse()
p.parse(open(sys.argv[1]))