def __init__(self):
self.focus = Stack()
self.running = False
self.win = None
self.s = None
self.tabs = None
self.bomb = None
def __init__(self, G):
self.marked = [False for _ in range(G.V)]
self.pre = Queue() # push v to queue before recursion
self.post = Queue() # ... after recursion
self.reverse_post = Stack() # push v to stack after recursion
for w in range(G.V):
if not self.marked[w]:
self.dfs(G, w)
def traverse(world, traversal_path):
# iterating through all rooms as unknown
def is_unknown(graph):
for k in graph:
if '?' in graph[k].values():
return True
return False
def find_new_move(visited, current_room):
curr_room = current_room.id
room_exits = visited[curr_room]
for direction in room_exits:
if room_exits[
direction] == '?' and current_room.get_room_in_direction(
direction).id not in visited:
return direction
return None
def find_new_room(traversal_path, visited, curr_room, stack, reverse):
while True:
next_move = stack.pop()
traversal_path.append(next_move)
next_room = curr_room.get_room_in_direction(next_move)
if '?' in visited[next_room.id].values():
return next_room.id
curr_room = next_room
stack = Stack()
curr = 0
visited = {0: {}}
curr_room = world.rooms[curr]
reverse = {'n': 's', 'e': 'w', 's': 'n', 'w': 'e'}
for direction in curr_room.get_exits():
visited[curr_room.id][direction] = '?'
while len(visited) < len(world.rooms) and is_unknown(visited):
curr_room = world.rooms[curr]
if curr_room not in visited:
visited[curr_room.id] = {}
for direction in curr_room.get_exits():
visited[curr_room.id][direction] = '?'
next_move = find_new_move(visited, curr_room)
if not next_move:
curr = find_new_room(traversal_path, visited, curr_room, stack,
reverse)
else:
traversal_path.append(next_move)
next_room = curr_room.get_room_in_direction(next_move)
visited[curr][next_move] = next_room.id
if next_room.id not in visited:
visited[next_room.id] = {}
for direction in next_room.get_exits():
visited[next_room.id][direction] = '?'
visited[next_room.id][reverse[next_move]] = curr_room.id
stack.push(reverse[next_move])
curr = next_room.id
def path_to(self, v):
if not self.has_path_to(v):
return None
edges = Stack()
e = self.edgeTo[v]
while e is not None:
edges.push(e)
e = self.edgeTo[e.From()]
return edges
def dfs_recursive(self, starting_vertex: T,
destination_vertex: T) -> PathType:
"""
Return a list containing a path from
starting_vertex to destination_vertex in
depth-first order.
This should be done using recursion.
"""
# would hold the found path to destination_vertex
correct_path = []
# holds the visited vertices
visited = set()
# initialize the stack class
stack = Stack()
# push the starting_vertex as a list
stack.push([starting_vertex])
# the inner recursive function
def inner_dfs_recursive(starting_vertex, destination_vertex):
# pops off a path from the stack
path = stack.pop()
# picks the last vertex from the path
current_vert = path[-1]
# base case of current_vert is the destination_vertex
if current_vert == destination_vertex:
# assess the nonlocal correct_path
nonlocal correct_path
# point correct_path to the path
correct_path = path
# return from the recursive function
return
# for neighbors of current_vert
for vertex in self.vertices[current_vert]:
# if vertex has not been visited
if vertex not in visited:
# add it to visited visited
visited.add(vertex)
# create a copy of path
new_path = list(path)
# append the vert to the new path
new_path.append(vertex)
# push the new path onto the stack
stack.push(new_path)
# recursively call inner_dfs_recursive with vertex as the starting_vertex
inner_dfs_recursive(vertex, destination_vertex)
# call the recursive function
inner_dfs_recursive(starting_vertex, destination_vertex)
# return the path
return correct_path
def playing(player):
traversal_path = []
visited_dict = {}
visited_set = set()
path = Stack()
oposite_directions = {"s": "n", "n": "s", "e": "w", "w": "e"}
while len(visited_set) < len(room_graph):
current = player.current_room
visited_set.add(current)
# path.push(current.id)
# traversal_path.append(current)
# if current.id not in visited_set:
# print(current.id)
# visited_set.add(current.id)
visited_dict[current.id] = {}
# if len(current.get_exits()) == 1:
# direction = current.get_exits()
# path.pop()
# previous_room = path.stack[-1]
# visited_dict[current.id][direction] = previous_room
# player.travel(previous_room)
unvisited = Queue()
for direction in current.get_exits():
if current.get_room_in_direction(direction) not in visited_set:
# visited_dict[current.id][direction] = False
# unvisited.enqueue(direction)
unvisited.enqueue(direction)
if unvisited.size() > 0:
# direction = unvisited.dequeue()
direction = unvisited.dequeue()
path.push(direction)
traversal_path.append(direction)
player.travel(direction)
else:
# for direction in visited_dict[current.id]:
# if visited_dict[current.id][direction] == False:
# visited_dict[current.id][direction] = player.current_room.get_room_in_direction(direction)
# player.travel(direction)
previous_room = path.pop()
traversal_path.append(oposite_directions[previous_room])
player.travel(oposite_directions[previous_room])
return traversal_path
def push(self, value):
if self.cur_stack_index < 0:
self.stacks.append(Stack())
self.cur_stack_index = 0
cur_stack = self.stacks[self.cur_stack_index]
if cur_stack.size == self.threshold:
cur_stack = Stack()
self.stacks.append(cur_stack)
self.cur_stack_index += 1
cur_stack.push(value)
def depth_first(self, xy1, xy2):
"""Execute a depth first search."""
tile_col1, tile_row1 = self.the_map.xy_to_cr(xy1[0], xy1[1])
tile_col2, tile_row2 = self.the_map.xy_to_cr(xy2[0], xy2[1])
successor_to_parent_map = {}
start_state = (tile_col1, tile_row1)
successor_to_parent_map[(
start_state,
None)] = None # (Successor, Action) -> (Parent, Action)
open_list = Stack()
open_list.push((start_state, None))
closed = []
while not open_list.isEmpty():
current_state, action_to_current_state = open_list.pop()
if current_state == (tile_col2, tile_row2):
return self.__get_action_path(
(current_state, action_to_current_state),
successor_to_parent_map)
if current_state not in closed:
for successor_state, action, step_cost in self.__get_successors(
current_state):
open_list.push((successor_state, action))
if successor_state not in closed:
successor_to_parent_map[(successor_state, action)] = (
current_state, action_to_current_state)
closed.append(current_state)
return []
def init_state(self):
self.modules = [None, None, None, None, None, None, None, None]
self.tabs = Tabs(5, 0, *["Empty"] * 8)
self.focus = Stack()
self.slot = -1
bomb = self.bomb = Bomb(self)
bomb.notify_on_finish(self.bomb_info_finished)
self.update_bomb_info(bomb)
chooser = ModuleChooser(self)
self.focus.push(chooser)
self.focus.push(bomb)
def dfs(self, starting_vertex, destination_vertex):
"""
Return a list containing a path from
starting_vertex to destination_vertex in
depth-first order.
"""
# make a stack
stack = Stack()
# make a visited set
visited = set()
# push the PATH to that node
stack.push([starting_vertex])
# while the stack isn't empty
while stack.size():
# pop the PATH
path = stack.pop()
# the last thing in the path is our current item
node = path[-1]
# if node is not visited:
if node not in visited:
# CHECK if it is the target
if node == destination_vertex:
return path
visited.add(node)
for neighbor in self.vertices[node]:
#copy the path
PATH_COPY = path.copy()
# add neighbor to the path
PATH_COPY.append(neighbor)
# enqueue the PATH_COPY
stack.push(PATH_COPY)
return None
def path(starting_point):
graph = dft(player)
visited = {}
visits = {}
if graph:
s = Stack()
s.push([starting_point.current_room.id])
while s.size() > 0:
path = s.pop()
current_room = path[-1]
count = 0
random_direction = ''
if current_room in visited:
get_list = len(traversal_path)
print(get_list)
if len(visited) < 9:
visited[current_room] = path
randoms = []
for idx, val in graph[current_room].items():
if val is not '?':
randoms.append(idx)
random_direction = random.choice(randoms)
if len(random_direction) == 1:
if len(traversal_path) == 0:
traversal_path.append(random_direction)
get_new_room = graph[current_room][random_direction]
s.push([get_new_room])
random_direction = ''
else:
traversal_path.append(random_direction)
get_new_room = graph[current_room][random_direction]
s.push([get_new_room])
random_direction = ''
# for next_position in graph:
# s.push([next_position])
print(len(traversal_path), "TRAVERSAL PATH LENGTH")
print(len(visited), "LENGTH VISITED")
print(graph, "GRAPH")
return traversal_path
def dft(self, starting_vertex: T) -> None:
"""
Print each vertex in depth-first order
beginning from starting_vertex.
"""
# keep track of visited vertices
visited = set()
# create a stack class
stack = Stack()
# push the starting vertex onto the stack
stack.push(starting_vertex)
# while stack is not empty
while stack.size():
# pop from the stack
current_vertex = stack.pop()
# if current vertex has not been visited
if current_vertex not in visited:
# add it to visited
visited.add(current_vertex)
# print the current vertex
print(current_vertex)
# for every neighbors of current_vertex
for vertex in self.vertices[current_vertex]:
# push it onto the stack
stack.push(vertex)
def depth_first_tree_search(problem):
"""Search the deepest nodes in the search tree first."""
# This search algorithm might not work in case of repeated paths.
global frontier,counter
if counter == -1:
frontier=Stack()
return tree_search(problem)
def parse_infix(expression: str) -> List[str]:
stack: Stack[str] = Stack()
result: List[str] = []
for expr in tokenize(expression):
if not is_float(expr) and expr not in symbols:
raise SymbolError()
if is_float(expr):
result.append(expr)
elif expr == ")":
while stack.top != "(":
result.append(stack.pop())
stack.pop()
elif expr == "(":
stack.push(expr)
elif stack.top and compare_priority(expr, stack.top):
result.append(stack.pop())
while stack.top and compare_priority(expr, stack.top):
result.append(stack.pop())
stack.push(expr)
else:
stack.push(expr)
while stack:
result.append(stack.pop())
return result
def depth_first_graph_search(problem):
"""Експандирај го прво најдлабокиот јазол во пребарувачкиот граф.
:param problem: даден проблем
:return: Node
"""
return graph_search(problem, Stack())
def depth_first_tree_search(problem):
"""Експандирај го прво најдлабокиот јазол во пребарувачкото дрво.
:param problem:даден проблем
:return: Node
"""
return tree_search(problem, Stack())
def flatten(self):
"""
Sets each value list in the data to contain only the active value, effectively
deleting the 'history' of each value list.
"""
for var in self.data.keys():
self.data[var] = Stack(self.data[var].current())
def __init__(self):
self.focus = Stack()
self.running = False
self.win = None
self.s = None
self.tabs = None
self.bomb = None
def earliest_ancestor(ancestors, starting_node, visited=None, path=None):
# initialize path = [starting_node]
# path = [starting_node]
# get parents - only care about parent not starting node i.e: node[1]
# loop to check for number of connections
# if no connections return -1
print('ancestors:', ancestors)
print('starting_node:', starting_node)
graph = Graph()
stack = Stack()
path = [starting_node]
stack.push(path)
graph = {}
for key, value in ancestors:
# print('k,v:',key, value)
if value not in graph:
# print('aa',value)
graph[value] = set()
if key not in graph:
print('aa', value)
graph[key] = set()
graph[value].add(key)
print('graph:', graph)
if len(graph[starting_node]) == 0:
return -1
visited = set()
paths = list()
print('paths:', paths)
while stack.size() > 0:
current_path = stack.pop()
print('current_path:', current_path)
current_node = current_path[-1]
print('current_node:', current_node)
if current_node not in visited:
visited.add(current_node)
print('visited', visited)
for parent in graph[current_node]:
if parent not in visited:
new_path = list(current_path)
new_path.append(parent)
print('new_path:', new_path)
stack.push(new_path)
if len(graph[current_node]) == 0:
paths.append(current_path)
print('paths:', paths)
sorted_paths = sorted(paths, reverse=True) # key=lambda x: len(x))
print('*****', sorted_paths[-1][-1])
return sorted_paths[-1][-1]
class DepthFirstOrder:
def __init__(self, G):
self.marked = [False for _ in range(G.V)]
self.pre = Queue() # push v to queue before recursion
self.post = Queue() # ... after recursion
self.reverse_post = Stack() # push v to stack after recursion
for w in range(G.V):
if not self.marked[w]:
self.dfs(G, w)
def dfs(self, G, v):
self.pre.enqueue(v)
self.marked[v] = True
for w in G.adj[v]:
if not self.marked[w]:
self.dfs(G, w)
self.post.enqueue(v)
self.reverse_post.push(v)
class StackWithMin2(Stack):
def __init__(self):
super(StackWithMin2, self).__init__()
self.stack = Stack()
def pop(self):
item = super(StackWithMin2, self).pop()
if item == self.min():
self.stack.pop()
return item
def push(self, item):
if item <= self.min():
self.stack.push(item)
super(StackWithMin2, self).push(item)
def min(self):
if self.stack.top is not None:
return self.stack.top.val
else:
return 1e10
def dfs(initial, _next, _test):
s: Stack = Stack()
marked = {initial}
s.push(initial)
while s:
parent = s.pop()
if _test(parent):
return parent
children = _next(parent)
for child in children:
if child not in marked:
marked.add(child)
s.push(child)
def sort_stack(stack):
s1 = stack
s2 = Stack(s1.size)
while(s1.is_empty() != True):
temp = s1.pop()
while(s2.is_empty() != True and s2.peek() > temp):
s1.push(s2.pop())
s2.push(temp)
return s2
def evaluate(self, vars):
stack = Stack()
queue = Queue()
for elem in self._rpn:
factory = OperatorFactory()
operator = factory.newOperator(elem, stack, vars)
if self.verbose == True:
print elem, operator.evaluate()
stack.push(operator.evaluate())
if self.verbose == True:
print stack.s()
return stack.popAll()
def init_state(self):
self.modules = [None, None, None, None, None, None, None, None]
self.tabs = Tabs(5, 0, *["Empty"] * 8)
self.focus = Stack()
self.slot = -1
bomb = self.bomb = Bomb(self)
bomb.notify_on_finish(self.bomb_info_finished)
self.update_bomb_info(bomb)
chooser = ModuleChooser(self)
self.focus.push(chooser)
self.focus.push(bomb)
def parse_sufix(expression: List[str]) -> float:
stack: Stack[str] = Stack()
result: float = 0.0
for expr in expression:
if is_float(expr):
stack.push(expr)
else:
elem1: str = stack.pop()
elem2: str = stack.pop()
result = evaluate(expr, float(elem2), float(elem1))
stack.push(str(result))
if stack:
result = float(stack.pop())
return result
def trace_cycle(self, v, w):
stack = Stack()
x = v
while x != w:
stack.push(x)
x = self.edge_to[x]
stack.push(w)
stack.push(v)
return stack
def _search(self) -> Optional[DepthFirstSearch._Node]:
stack: Stack = Stack()
initial: DepthFirstSearch._Node = self._Node(self._start, None)
marked: Set[MazeLocation] = {initial.state}
stack.push(initial)
while stack:
parent: DepthFirstSearch._Node = stack.pop()
state: MazeLocation = parent.state
if self._test_goal(state):
return parent
children: List[MazeLocation] = self._success(state)
for child in children:
if child not in marked:
marked.add(child)
stack.push(self._Node(child, parent))
def path_to(self, v):
if not self.has_path_to(v):
return []
path = Stack()
x = v
while x != self.s:
path.push(x)
x = self.edge_to[x]
path.push(self.s)
return path
def _fill(self, pause, plot) -> None:
stack: Stack = Stack()
initial: Maze._Node = self._Node(self._start, None)
marked: Set[MazeLocation] = {initial.state}
stack.push(initial)
while stack:
parent: Maze._Node = stack.pop()
state: MazeLocation = parent.state
self._grid[state] = Cell.PATH
if plot:
self._draw(pause)
children: List[MazeLocation] = self._success(state)
for child in children:
if child not in marked:
marked.add(child)
stack.push(self._Node(child, parent))
def dft(self, starting_vertex):
"""
Print each vertex in depth-first order
beginning from starting_vertex.
"""
# make a stack
s = Stack()
# push on your starting node
s.push([starting_vertex])
# make a set to track if it was visited
visited = set()
# while stack not empty
while s.size() > 0:
# pop off what is on top.
current_node = s.pop()
# if we have no visited the vertex before
if current_node not in visited:
# run function/print
# print(current_node)
# mark as visited
# visited.add(current_node)
# get its neighbors
# neighbors = self.get_neighbors(current_node)
# for each of the neighbors
self.vertices[room.id] = {}
for neighbor in room.get_exits():
self.vertices[room.id][room.get_room_in_direction(
possible_direction).id] = neighbor
visited.add(room)
exits = room.get_exits()
while len(exits) > 0:
# select first neighbors on list
direct = exits[0]
# beej: create neighbor object
path = list(current_node)
# add possibles directions to move
path.append(room.get_room_in_direction(direct))
# add to stack
s.push(path)
# remove to contine
exits.remove(direct)
return self.vertices
def evaluate(self, vars):
stack = Stack()
queue = Queue()
for elem in self._rpn:
factory = OperatorFactory()
operator = factory.newOperator(elem, stack, vars)
if self.verbose == True:
print elem, operator.evaluate()
stack.push(operator.evaluate())
if self.verbose == True:
print stack.s()
return stack.popAll()
def __init__(self, stack_size=256, *args, **kwargs):
self.stack = Stack(size=stack_size)
self.memory = Memory(memory=kwargs.get('memory', b''))
self.storage = dict()
self.args = args
self.kwargs = kwargs
self.opcode = None
self.current_opcode_name = None
self.code = None
self.msg = None
self.code = None
self.debug = False
self.pc = 0
self.prev_pc = -1
self.stop = False
def convert(self, verbose):
self.verbose = verbose
operators = "^*+-\/"
# operands = string.ascii_lowercase + string.digits
output = Queue()
stack = Stack()
for token in self.infix:
operands = re.match("^[a-z]$|^\d+\.\d+$|^\d+$", token)
operators = re.match("^[+-\/*^]$", token)
# if token is a number or variable add it to putput
if operands:
output.push(token)
if self.verbose == True:
print "1 token = %s, output = %s" % (token, output.list[::-1])
# if the token is variable add it mapVariable dictionary
if token in string.ascii_lowercase:
self.mapVariables[token] = ""
# if token is an operator
elif operators:
# while there is another operator on the stack
while not stack.isEmpty():
# if operator is lef-associative and its precedence is less than or equal to that on stack, or operator has precedence less than that on stack (is not left-associative)
if stack.lastOnStack() != "(" and (
(
self.precedence[token][0] <= self.precedence[stack.lastOnStack()][0]
and self.precedence[token][1] == "L"
)
or self.precedence[token][0] < self.precedence[stack.lastOnStack()][0]
):
# push operator to output from stack
output.push(stack.pop())
if self.verbose == True:
print "2 token = %s, output = %s" % (token, output.list[::-1])
else:
break
# push operator to stack
stack.push(token)
if self.verbose == True:
print "3 token = %s, stack = %s" % (token, stack.list[::-1])
# if token is left parenthesis push it to stack
elif token == "(":
stack.push(token)
if self.verbose == True:
print "4 token = %s, stack = %s" % (token, stack.list[::-1])
# if token is right parenthesis
elif token == ")":
# until token at the top of stack is not left parethesis
while stack.lastOnStack() != "(":
# push from stack to output
output.push(stack.pop())
if self.verbose == True:
print "5 token = %s, output = %s" % (token, output.list[::-1])
# and pop left parethesis from stack but not to output
stack.pop()
if self.verbose == True:
print "Left on stack " + str(stack.list[::-1])
print "Output " + str(output.list)
self._rpn = output.list[::-1]
while len(stack.list) > 0:
self._rpn.append(stack.pop())
if self.verbose == True:
print "RPN value = " + str(self._rpn)
return self._rpn
class Program:
def __init__(self):
self.focus = Stack()
self.running = False
self.win = None
self.s = None
self.tabs = None
self.bomb = None
def init_state(self):
self.modules = [None, None, None, None, None, None, None, None]
self.tabs = Tabs(5, 0, *["Empty"] * 8)
self.focus = Stack()
self.slot = -1
bomb = self.bomb = Bomb(self)
bomb.notify_on_finish(self.bomb_info_finished)
self.update_bomb_info(bomb)
chooser = ModuleChooser(self)
self.focus.push(chooser)
self.focus.push(bomb)
def run(self, screen):
if self.running:
return
self.running = True
self.screen = screen
curses.noecho()
curses.curs_set(0)
curses.init_pair(1, curses.COLOR_RED, curses.COLOR_BLACK)
curses.init_pair(2, curses.COLOR_BLUE, curses.COLOR_BLACK)
curses.init_pair(3, curses.COLOR_BLACK, curses.COLOR_WHITE)
max_y, max_y = screen.getmaxyx()
self.win = win = curses.newwin(50, max_y, 7, 0)
win.keypad(1)
self.init_state()
self.add_decoration()
self.tabs.update(screen)
while True:
logging.debug("Program: Updating current object {:}".format(self.focus.cur()))
self.focus.cur().update(win)
logging.debug("Program: Refreshing window")
screen.refresh()
win.refresh()
logging.debug("Program: Waiting for event")
ev = win.getch()
if ev == curses.KEY_F12:
return
elif ev == curses.KEY_F10:
if not type(self.focus.cur()) is Bomb:
self.slot = -1
win.erase()
self.focus.push(self.bomb)
elif ev == curses.KEY_F11:
self.init_state()
elif curses.KEY_F1 <= ev <= curses.KEY_F8:
curses.curs_set(0)
self.slot = ev - curses.KEY_F1
logging.debug("Program: Selected module {}".format(self.slot))
if not type(self.focus.cur()) is ModuleChooser:
self.focus.pop()
if self.modules[self.slot]:
logging.debug("Program: Current module active: {!s:}".format(self.focus.cur()))
self.focus.push(self.modules[self.slot])
self.win.erase()
else:
self.focus.cur().event(ev, chr(ev))
self.tabs.set_active(self.slot)
self.tabs.update(screen)
if self.focus.cur() is None:
win.addstr(10, 50, "No module active")
def bomb_info_finished(self, bomb):
logging.debug("Program: Bomb info finished")
self.update_bomb_info(bomb)
if self.slot == -1:
self.slot = 0
self.focus.pop()
def update_bomb_info(self, bomb):
self.screen.move(1,0)
self.screen.clrtoeol()
self.screen.addstr("batteries: {!s: <9} parallel: {}".format(bomb.batteries, bomb.parallel))
self.screen.move(2,0)
self.screen.clrtoeol()
self.screen.addstr("serial: {!s: <9} vowels: {}".format(bomb.serial, bomb.vowels))
self.screen.move(3,0)
self.screen.clrtoeol()
self.screen.addstr("FRK: {!s: <9} CAR: {}".format(bomb.frk, bomb.car))
def set_module(self, module):
self.modules[self.slot] = module
self.tabs.set_tab(self.slot, module.title)
self.focus.push(module)
def add_decoration(self):
self.screen.addstr(0,0, " Keep talking and Nobody Explodes - Manual helper", curses.A_REVERSE | curses.A_BOLD)
y, x = self.screen.getyx()
max_y, max_x = self.screen.getmaxyx()
length = max_x - x
self.screen.addstr(" " * length, curses.A_REVERSE | curses.A_BOLD)
self.screen.addstr(6,0, "─" * max_x)
import re
from utils import Stack
from utils import Queue
def recu(s, out, stk):
print s
for token in s:
print token
dig = re.match('\d+', token)
oper = re.match('[\+\-\/\*]', token)
if token == '(':
a = s[s.index(token)+1:s.index(')')]
print "obciachane ", a
del s[s.index(')')]
recu(a, out, stk)
elif dig:
out.push(token)
elif oper:
stk.push(token)
output = Queue()
stack = Stack()
s1 = '(2+3)*5'
s2 = re.split('\s*([+\-*/()]|\d+\.\d+|\d+)\s*', s1)
recu(s2, output, stack)
print output.popAll(), stack.popAll()
class DbSession(object):
"""Provides an API for users to make changes to an in-memory database with transactions.
Attributes:
database: An instance of an in-memory database.
transaction_stack: A stack of active transactions.
current_trans: The currently active transaction. Transactions are a set of keys which
represent keys in the database that have been edited during the current transaction.
"""
def __init__(self):
self.database = InMemoryDatabase()
self.transaction_stack = Stack()
self.current_trans = None
self.reset_transaction_state()
def reset_transaction_state(self):
self.current_trans = set() if self.transaction_stack.is_empty() else self.transaction_stack.current()
# Transaction stack should always have a 'base' transaction which can't be rolled back/commited
self.transaction_stack = Stack(self.current_trans)
def pop_transaction(self):
self.transaction_stack.pop()
self.current_trans = self.transaction_stack.current()
def has_open_transaction(self):
return self.transaction_stack.size() > 1
def begin(self):
self.current_trans = set()
self.transaction_stack.push(self.current_trans)
def rollback(self):
if not self.has_open_transaction():
print('NO TRANSACTION')
else:
map(self.database.remove, list(self.current_trans))
self.pop_transaction()
def commit(self):
if not self.has_open_transaction():
print('NO TRANSACTION')
else:
self.database.flatten()
self.reset_transaction_state()
def set_var(self, var, value):
if var in self.current_trans:
self.database.change(var, value)
else:
self.database.add(var, value)
self.current_trans.add(var)
def unset_var(self, var):
self.set_var(var, None)
def get_var(self, var):
print(self.database.get(var) or 'NULL')
def num_equal_to(self, value):
print(self.database.num_equal_to(value))
def __repr__(self):
return '{}\nTransaction Stack: {}'.format(self.database, self.transaction_stack)
def __init__(self):
self.database = InMemoryDatabase()
self.transaction_stack = Stack()
self.current_trans = None
self.reset_transaction_state()
def reset_transaction_state(self):
self.current_trans = set() if self.transaction_stack.is_empty() else self.transaction_stack.current()
# Transaction stack should always have a 'base' transaction which can't be rolled back/commited
self.transaction_stack = Stack(self.current_trans)
