def __insert(self, start_node, word):
while (word):
ch = word[0]
child = start_node.get_child(ch)
if not child:
new_node = TrieNode(word)
new_node.is_word = True
start_node.set_child(word[0], new_node)
return
else:
child_data = child.get_data()
# child has exactly the given word
if child_data == word:
if not child.is_word:
child.is_word = True
return
idx = find_last_common_idx(child_data, word)
# child has part of the given word as a prefix
if idx <= len(word) and idx != len(child_data):
# split child
new_node = TrieNode(child_data[:idx])
child.data = child_data[idx:]
new_node.set_child(child_data[idx], child)
# connect new_node to start_node
start_node.set_child(child_data[0], new_node)
child = new_node
start_node = child
word = word[idx:]
if word == "":
start_node.is_word = True
def insert(self, word):
assert type(word) == str, "You can insert String objects only!!"
assert len(word) > 0, "You can't insert any empty String!!"
if self.root.children == {}:
new_node = TrieNode(word)
new_node.is_word = True
self.root.set_child(word[0], new_node)
else:
start_node = self.root
self.__insert(start_node, word)