def parse_concatenation(self):
"""
Parse the string from its current index into a concatenation or an expression that can be contained by an concatenation.
@return: a visitable regular expression object from the Regex package.
"""
repetitions = [self.parse_qualified()]
while self.next_is_not(u'|)'):
repetitions.append(self.parse_qualified())
if len(repetitions) > 1:
return Regex.Concatenation(repetitions)
else:
return repetitions[0]
def visit_concatenation(self, concatenation):
new_concatenation = Regex.Concatenation([])
for child in concatenation.children:
child.accept(self)
new_concatenation.children.append(self.stack.pop())
self.stack.append(new_concatenation)