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from collections import defaultdict, deque
from copy import deepcopy
from random import Random
from string import ascii_lowercase as lowercase
import sys
import time
import traceback
from snakegame.colour import hash_colour
from snakegame import common
SOFT_TIME_LIMIT = 0.5
HARD_TIME_LIMIT = 1.0
class Engine(object):
def __init__(
self,
rows, columns, n_apples, n_ice_creams=0, n_shrink_potions=0,
wrap=True,
random=None,
*args, **kwargs
):
super(Engine, self).__init__(*args, **kwargs)
if random is None:
random = Random()
self.random = random
self.wrap = wrap
self.bots = {}
self.new_game(rows, columns, n_apples, n_ice_creams, n_shrink_potions)
def get_random_position(self):
x = self.random.randrange(0, self.columns)
y = self.random.randrange(0, self.rows)
return (x, y)
def replace_random(self, old, new):
for i in xrange(self.rows * self.columns):
x, y = self.get_random_position()
if self.board[y][x] == old:
self.board[y][x] = new
return x, y
def add_items(self, item, amount):
for i in xrange(amount):
x, y = self.get_random_position()
self.board[y][x] = item
def new_game(self, rows, columns, n_apples, n_ice_creams, n_shrink_potions):
self.game_ticks = 0
self.game_id = self.random.randint(0, sys.maxint)
self.letters = list(lowercase)
self.letters.reverse()
self.rows = rows
self.columns = columns
self.messages_by_team = defaultdict(dict)
# make board
self.board = [[common.EMPTY for x in xrange(columns)] for y in xrange(rows)]
self.add_items(common.APPLE, n_apples)
self.add_items(common.ICE_CREAM, n_ice_creams)
self.add_items(common.SHRINK_POTION, n_shrink_potions)
def add_bot(self, bot, team=None, colour=None):
"""
A bot is a callable object, with this method signature:
def bot_callable(
board=[[cell for cell in row] for row in board],
position=(snake_x, snake_y)
):
return random.choice('RULD')
If team is not None, this means you will get a third parameter,
containing messages from the other bots on your team.
"""
letter = self.letters.pop()
name = bot.__name__
if colour is None:
colour = hash_colour(name)
position = self.replace_random(common.EMPTY, letter.upper())
if position is None:
raise KeyError, "Could not insert snake into the board."
self.bots[letter] = [bot, colour, deque([position]), team, 0]
return letter
def remove_bot(self, letter):
letter = letter.lower()
for row in self.board:
for x, cell in enumerate(row):
if cell.lower() == letter:
row[x] = common.EMPTY
del self.bots[letter]
def update_snakes(self):
self.game_ticks += 1
for letter, (bot, colour, path, team, length_delta) in self.bots.items():
board = deepcopy(self.board)
try:
x, y = path[-1]
start = time.time()
if team is None:
d = bot(board, (x, y))
else:
messages = self.messages_by_team[team]
d, message = bot(board, (x, y), messages)
assert isinstance(message, str), \
"Message should be a byte string, not %s (%r)." % (
type(message),
message,
)
messages[letter] = message
end = time.time()
delta = end - start
assert delta < HARD_TIME_LIMIT, 'Exceeded hard time limit.'
if delta >= SOFT_TIME_LIMIT:
print 'Bot %s (%r) exceeded soft time limit.' % (letter.upper(), bot)
# Sanity checking...
assert isinstance(d, basestring), \
"Return value should be a string."
d = d.upper()
assert d in common.directions, "Return value should be 'U', 'D', 'L' or 'R'."
# Get new position.
dx, dy = common.directions[d]
nx = x + dx
ny = y + dy
if self.wrap:
ny %= self.rows
nx %= self.columns
else:
if ny < 0 or ny >= self.rows or nx < 0 or nx >= self.columns:
self.remove_bot(letter)
continue
oldcell = self.board[ny][nx]
if common.is_vacant(oldcell):
# Move snake forward.
self.board[ny][nx] = letter.upper()
path.append((nx, ny))
# Make old head into body.
self.board[y][x] = letter.lower()
# Since they added 1 to their head, we take away 1 (then do bonuses)
length_delta -= 1
if oldcell == common.APPLE:
length_delta += 1
self.replace_random(common.EMPTY, common.APPLE)
elif oldcell == common.ICE_CREAM:
length_delta += 3
self.replace_random(common.EMPTY, common.ICE_CREAM)
elif oldcell == common.SHRINK_POTION:
length_delta -= 1
self.replace_random(common.EMPTY, common.SHRINK_POTION)
if length_delta > 0:
length_delta -= 1
else:
while length_delta < 0:
# Remove last part of snake.
length_delta += 1
if len(path) > 1:
ox, oy = path.popleft()
self.board[oy][ox] = common.EMPTY
# Need to put length delta back in list
self.bots[letter][4] = length_delta
else:
self.remove_bot(letter)
except:
print "Exception in bot %s (%s):" % (letter.upper(), bot)
print '-'*60
traceback.print_exc()
print '-'*60
self.remove_bot(letter)
def __iter__(self):
yield self.board
while self.bots:
self.update_snakes()
yield self.board
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