Beginning Python - From Novice to Professional

406 CHAPTER 20 ■ PROJECT 1: INSTANT MARKUP
def condition(self, block):
if not self.first: return False
self.first = False
return HeadingRule.condition(self, block)
class ListItemRule(Rule):
"""
A list item is a paragraph that begins with a hyphen. As part of
the formatting, the hyphen is removed.
"""
type = 'listitem'
def condition(self, block):
return block[0] == '-'
def action(self, block, handler):
handler.start(self.type)
handler.feed(block[1:].strip())
handler.end(self.type)
return 1
class ListRule(ListItemRule):
"""
A list begins between a block that is not a list item and a
subsequent list item. It ends after the last consecutive list
item.
"""
type = 'list'
inside = False
def condition(self, block):
return True
def action(self, block, handler):
if not self.inside and ListItemRule.condition(self, block):
handler.start(self.type)
self.inside = True
elif self.inside and not ListItemRule.condition(self, block):
handler.end(self.type)
self.inside = False
return False
class ParagraphRule(Rule):
"""
A paragraph is simply a block that isn't covered by any of the
other rules.
"""
type = 'paragraph'
def condition(self, block):
return True