def expand_subparts(self, lines, block_name):
leading = ()
parts = ()
while 1:
if len(lines) == 0:
if len(leading) > 0:
back = Block.with_lines(None, leading)
parts = parts + (back,)
break
else:
head = lines[0]
rest = lines[1:]
match = re.match(r'^\s*\<\<\<([^\>]*)\>\>\>\s*$', head)
if match != None:
back = Block.with_lines(None, leading)
leading = ()
takeout = Block.empty(match.groups(1)[0])
parts = parts + (back,takeout)
else:
head = re.subn(r'\<\<\<\<([^\>]*)\>\>\>\>', r'<<<\1>>>', head)[0]
leading = leading + (head,)
lines = rest
return Block.with_parts(block_name, parts)
