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- class Handler:
- """
- An object that handles method calls from the Parser.
- The Parser will call the start() and end() methods at the
- beginning of each block, with the proper block name as a
- parameter. The sub() method will be used in regular expression
- substitution. When called with a name such as 'emphasis', it will
- return a proper substitution function.
- """
- def callback(self, prefix, name, *args):
- method = getattr(self, prefix + name, None)
- if callable(method): return method(*args)
- def start(self, name):
- self.callback('start_', name)
- def end(self, name):
- self.callback('end_', name)
- def sub(self, name):
- def substitution(match):
- result = self.callback('sub_', name, match)
- if result is None: match.group(0)
- return result
- return substitution
- class HTMLRenderer(Handler):
- """
- A specific handler used for rendering HTML.
- The methods in HTMLRenderer are accessed from the superclass
- Handler's start(), end(), and sub() methods. They implement basic
- markup as used in HTML documents.
- """
- def start_document(self):
- print('<html><head><title>...</title></head><body>')
- def end_document(self):
- print('</body></html>')
- def start_paragraph(self):
- print('<p>')
- def end_paragraph(self):
- print('</p>')
- def start_heading(self):
- print('<h2>')
- def end_heading(self):
- print('</h2>')
- def start_list(self):
- print('<ul>')
- def end_list(self):
- print('</ul>')
- def start_listitem(self):
- print('<li>')
- def end_listitem(self):
- print('</li>')
- def start_title(self):
- print('<h1>')
- def end_title(self):
- print('</h1>')
- def sub_emphasis(self, match):
- return '<em>{}</em>'.format(match.group(1))
- def sub_url(self, match):
- return '<a href="{}">{}</a>'.format(match.group(1), match.group(1))
- def sub_mail(self, match):
- return '<a href="mailto:{}">{}</a>'.format(match.group(1), match.group(1))
- def feed(self, data):
- print(data)
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