Документ взят из кэша поисковой машины. Адрес оригинального документа : http://kodomo.fbb.msu.ru/hg/snake/raw-annotate/198e91c5b94c/snake.py Дата изменения: Unknown Дата индексирования: Fri Feb 11 14:30:38 2011 Кодировка: Поисковые слова: tail

me@44: """Guts of snakes."""
me@44:
me@34: import engine
me@34:
me@34: def preprocess(line):
me@44: """Remove comments and junk spaces from line of snake definition file."""
me@34: if '//' in line:
me@34: line = line[:line.index('//')]
me@34: line = line.rstrip()
me@34: return line
martiran@30:
martiran@30: class Snake(object):
me@44: """Snakes.
me@44:
me@44: Attributes:
me@44:
me@44: - `cells` -- list of cells belonging to the snake The first of these cells
me@44: becomes head, the last one becomes tail, the rest ar body. If snake has
me@44: only one cell, it is tail.
me@44: - `color` -- color of snake
me@44: - `rules` -- a list of Rule objects
me@44: """
me@44:
martiran@32: def __init__ (self, cells, color):
martiran@32: self.cells = cells
martiran@32: self.color = color
martiran@32: self.rules = []
me@34:
me@34: def load (self, file):
me@44: """Load snake description from file.
me@44:
me@44: See program design docs for file syntax.
me@44: """
me@65: for line in file:
me@65: magic, name = preprocess(line).split(' ', 1)
me@65: break
me@34: assert magic == "snake", "This is not snake file"
me@65: for line in file:
me@65: line = preprocess(line)
me@34: if line == 'end':
me@34: break
me@34: assert line == '', "Rules must be separated by empty lines"
me@51: self.rules.append(Rule(self).load(file))
me@34:
martiran@30: def fill (self):
me@44: """Mark every cell in `self.cells` as belonging to self."""
martiran@32: for cell in self.cells:
martiran@32: cell.snake = self
martiran@31: snake.cells[0].type = 'head'
me@45: for cell in self.cells[1:-1]:
me@45: cell.type = 'body'
martiran@31: snake.cells[-1].type = 'tail'
martiran@31: return
me@34:
martiran@30: class Rule(object):
me@44: """Rule defining possible behaviour of snake."""
me@34:
me@34: codes = {
me@34: 'h': 'head',
me@34: 'b': 'body',
me@34: 't': 'tail',
me@34: '#': 'wall',
me@34: ' ': 'any',
me@34: '-': 'empty',
me@34: }
me@34:
martiran@32: def __init__ (self, snake):
martiran@32: self.snake = snake
me@34: self.direction = (1, 0)
me@34: self.pattern = {}
me@34:
me@34: def load (self, file):
me@44: """Load rule definition from file. Ignore any leading empty lines."""
me@34: y = 0
me@34: for line in file:
me@34: line = preprocess(line)
me@34: if y == 0 and line == '':
me@34: continue
me@36: if y == 7:
me@36: break
me@41: assert len(line) == 8, "Rule lines must be exactly 7 chars long"
me@34: assert line[-1] == ';', "Rule lines must end with semicolon"
me@63: for x, char in enumerate(line[:7]):
me@34: self.parse_cell(x, y, char)
me@34: y += 1
me@34:
me@34: def parse_cell(self, x, y, char):
me@44: """Parse definition of cell in rule file.
me@44:
me@44: Cell is defined by one character.
me@44: """
me@34: assert char.lower() in self.codes, "Illegal symbol in rule: %s" % char
me@51: cell = engine.Cell(x, y, self.snake)
me@34: if char in 'htb':
me@34: if char.islower():
me@51: cell.snake_type = 'my'
me@34: else:
me@51: cell.snake_type = 'enemy'
me@37: if char == 'h':
me@37: assert (x, y) == (3, 3), "Own head must in the center of rule"
me@37: if (x, y) == (3, 3):
me@37: assert char == 'h', "In the center of rule must be own head"
me@34: cell.type = self.codes[char.lower()]
me@34: self.pattern[x, y] = cell
me@34:
martiran@32: def applies (self, field, x, y):
me@44: """True if the rule applies in the field at position (x,y)."""
me@38: for px, fx in zip(range(7), range(x - 3, x + 4)):
me@38: for py, fy in zip(range(7), range(y - 3, y + 4)):
me@49: if (fx, fy) in field:
me@43: if field[fx, fy] != self.pattern[px, py]:
me@43: return False
me@43: else:
me@43: if self.pattern[px, py].type != 'any':
me@43: return False
me@38: return True
me@34:
martiran@32: def rotate (self, rot):
me@44: """Rotate rule pattern `rot` times counterclockwise."""
me@39: for i in range(((rot % 4) + 4) % 4):
me@39: self.rotate_ccw()
me@39:
me@39: def rotate_ccw(self):
me@44: """Rotate rule pattern one time counterclockwise."""
me@39: pattern = {}
me@39: for x in range(7):
me@39: for y in range(7):
me@39: pattern[y, 6 - x] = self.pattern[x, y]
me@39: self.pattern = pattern
me@39: x, y = self.direction
me@39: self.direction = y, -x
me@34:
me@34: # vim: set ts=4 sts=4 sw=4 et: