def dfs_walk(self):
stack = Stack()
stack.push(next(iter(self.nodes.values())))
while stack.size() > 0:
first = stack.pop()
if first.mark:
continue
else:
print(first.name)
first.mark = True
for neighbour in first.connections:
stack.push(self.nodes[neighbour])
def check_relation(label, x):
# todo : need to add negation to each label.
# label : a list of time_signature
# x : a query for its label
stack = Stack()
unpop = []
modified = True
for node in label:
if node < x:
if node.type == 'start':
stack.push(node)
# print('push')
if node.type == 'end':
if node.relation == stack.peek().relation:
stack.pop()
# print('pop')
while (unpop and unpop[-1] == stack.peek().relation):
stack.pop()
# print('pop')
unpop = unpop[:-1]
else:
unpop.append(node.relation)
else:
if not modified:
if node.type == 'end' and stack.peek(
).relation[:3] == 'NOT' and node.relation[:3] != 'NOT':
stack.push(
time_signature('0000-00-00', relation=node.relation))
if stack.size() == 1:
rel = node.relation
else:
rel = stack.peek().relation
return rel
else:
rel = stack.peek().relation
return rel