def train_string(self, string):
"""docstring for train_string"""
input_sequence = [c for c in string]
if (0 < len(input_sequence)):
self.root_production.last().insert_after(Symbol.factory(self, input_sequence.pop(0)))
while (0 < len(input_sequence)):
self.root_production.last().insert_after(Symbol.factory(self, input_sequence.pop(0)))
match = self.get_index(self.root_production.last().prev)
if not match:
self.add_index(self.root_production.last().prev)
elif match.next != self.root_production.last().prev:
self.root_production.last().prev.process_match(match)
