Python-萬能XML

原創

2019-02-01 13:28

XML文件

<website>
  <page name="index" title="Home Page">
    <h1>Welcome to My Home Page</h1>

    <p>Hi, there. My name is Mr. Gumby, and this is my home page. Here
    are some of my interests:</p>

    <ul>
      <li><a href="interests/shouting.html">Shouting</a></li>
      <li><a href="interests/sleeping.html">Sleeping</a></li>
      <li><a href="interests/eating.html">Eating</a></li>
    </ul>
  </page>
  <directory name="interests">
    <page name="shouting" title="Shouting">
      <h1>Mr. Gumby's Shouting Page</h1>

      <p>...</p>
    </page>
    <page name="sleeping" title="Sleeping">
      <h1>Mr. Gumby's Sleeping Page</h1>

      <p>...</p>
    </page>
    <page name="eating" title="Eating">
      <h1>Mr. Gumby's Eating Page</h1>

      <p>...</p>
    </page>
  </directory>
</website>

Resource

website.py

#!/usr/bin/python
# -*- coding: UTF-8 -*-

from xml.sax.handler import ContentHandler
from xml.sax import parse
import os


class Dispatcher:

    def dispatch(self, prefix, name, attrs=None):
        mname = prefix + name.capitalize()
        dname = 'default' + prefix.capitalize()
        method = getattr(self, mname, None)
        if callable(method): args = ()
        else:
            method = getattr(self, dname, None)
            args = name,
        if prefix == 'start': args += attrs,
        if callable(method): method(*args)

    def startElement(self, name, attrs):
        self.dispatch('start', name, attrs)

    def endElement(self, name):
        self.dispatch('end', name)


class WebsiteConstructor(Dispatcher, ContentHandler):

    passthrough = False

    def __init__(self, directory):
        self.directory = [directory]
        self.ensureDirectory()

    def ensureDirectory(self):
        path = os.path.join(*self.directory)
        # python 2.x will throw "TypeError: makedirs() got an unexpected keyword argument 'exist_ok'"
        os.makedirs(path, exist_ok=True)

    def characters(self, chars):
        if self.passthrough: self.out.write(chars)

    def defaultStart(self, name, attrs):
        if self.passthrough:
            self.out.write('<' + name)
            for key, val in attrs.items():
                self.out.write(' {}="{}"'.format(key, val))
            self.out.write('>')

    def defaultEnd(self, name):
        if self.passthrough:
            self.out.write('</{}>'.format(name))

    def startDirectory(self, attrs):
        self.directory.append(attrs['name'])
        self.ensureDirectory()

    def endDirectory(self):
        self.directory.pop()

    def startPage(self, attrs):
        filename = os.path.join(*self.directory + [attrs['name'] + '.html'])
        self.out = open(filename, 'w')
        self.writeHeader(attrs['title'])
        self.passthrough = True

    def endPage(self):
        self.passthrough = False
        self.writeFooter()
        self.out.close()

    def writeHeader(self, title):
        self.out.write('<html>\n  <head>\n    <title>')
        self.out.write(title)
        self.out.write('</title>\n  </head>\n  <body>\n')

    def writeFooter(self):
        self.out.write('\n  </body>\n</html>\n')


parse('website.xml', WebsiteConstructor('public_html'))

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