From cbc0427bc41b6adb7077657ff8ba4bbb72e672bc Mon Sep 17 00:00:00 2001 From: Ivan Malison Date: Thu, 9 Jul 2015 18:30:49 -0700 Subject: [PATCH] Slash grid problem. --- dotfiles/lib/python/slash_grid.py | 222 ++++++++++++++++++++++++++++++ 1 file changed, 222 insertions(+) create mode 100755 dotfiles/lib/python/slash_grid.py diff --git a/dotfiles/lib/python/slash_grid.py b/dotfiles/lib/python/slash_grid.py new file mode 100755 index 00000000..bfc0801d --- /dev/null +++ b/dotfiles/lib/python/slash_grid.py @@ -0,0 +1,222 @@ +#!/usr/bin/env python +class SlashGrid(object): + + def __init__(self, slash_array): + self.slash_array = slash_array + self.nodes = [ + [Node(row_index, column_index, self) for column_index, value in enumerate(row)] + for row_index, row in enumerate(slash_array) + ] + + @property + def width(self): + return len(self.nodes[0]) + + @property + def height(self): + return len(self.nodes) + + def run(self, in_between_searches=lambda x: x): + count = 0 + for node_row in self.nodes: + for node in node_row: + if not node.top_visited: + in_between_searches(self) + count += 1 + node.search('top', tag=count) + if not node.bottom_visited: + in_between_searches(self) + count += 1 + node.search('bottom', tag=count) + in_between_searches(self) + return count + + def __str__(self): + return '\n'.join(self.grid_row_string(row) for row in self.nodes) + + def grid_row_string(self, row): + node_strings = [ + node.string_lines for node in row + ] + return '\n'.join(''.join(string_collection) for string_collection in zip(*node_strings)) + + +class OutOfBoundsError(Exception): + pass + + +class Node(object): + + _right_top = ('right', 'top') + _right_bottom = ('right', 'bottom') + _left_top = ('left', 'top') + _left_bottom = ('left', 'bottom') + + _directions_map = { + True: (_left_top, _right_bottom), + False: (_left_bottom, _right_top) + } + + _opposites = { + 'left': 'right', + 'right': 'left', + 'top': 'bottom', + 'bottom': 'top' + } + + def __init__(self, row_index, column_index, grid): + self.row_index = row_index + self.column_index = column_index + self.grid = grid + self.top_visited = False + self.bottom_visited = False + + @property + def string_lines(self): + if self.forward: + return [''.join([self.string_for_visited(self.top_visited), '/']), + ''.join(['/', self.string_for_visited(self.bottom_visited)])] + else: + return [''.join(['\\', self.string_for_visited(self.top_visited)]), + ''.join([self.string_for_visited(self.bottom_visited), '\\'])] + + @staticmethod + def string_for_visited(visited): + if visited is True: + return 'X' + elif visited is False: + return ' ' + else: + string = str(visited) + if isinstance(visited, int): + return chr(65 + visited) + if len(string) > 1: + return '`' + else: + return string + + @property + def forward(self): + return self.grid.slash_array[self.row_index][self.column_index] + + def directions_from(self, edge): + for direction_pair in self._directions_map[self.forward]: + if edge in direction_pair: + return direction_pair + else: + raise Exception() + + def opposite(self, edge): + return self._opposites[edge] + + def edge_visited(self, edge): + return getattr(self, self.edge_visited_string(edge)) + + def edge_visited_string(self, edge): + return '{0}_visited'.format(edge) + + def visit_edge(self, edge, tag): + was_unvisited = not self.edge_visited(edge) + if was_unvisited: + setattr(self, self.edge_visited_string(edge), tag) + return was_unvisited + + def search(self, edge, tag=True): + was_unvisited = self.visit_edge(edge, tag) + if not was_unvisited: + return + directions = self.directions_from(edge) + for travel_edge in directions: + try: + getattr(self, travel_edge).search(self.opposite(travel_edge), tag=tag) + except OutOfBoundsError: + pass + + @property + def left_visited(self): + if self.forward: + return self.top_visited + else: + return self.bottom_visited + + @property + def right_visited(self): + if self.forward: + return self.bottom_visited + else: + return self.top_visited + + @right_visited.setter + def right_visited(self, value): + if self.forward: + self.bottom_visited = value + else: + self.top_visited = value + + + @left_visited.setter + def left_visited(self, value): + if self.forward: + self.top_visited = value + else: + self.bottom_visited = value + + @property + def left(self): + if self.column_index <= 0: + raise OutOfBoundsError() + return self.grid.nodes[self.row_index][self.column_index-1] + + @property + def right(self): + if self.column_index > self.grid.width - 2: + raise OutOfBoundsError() + return self.grid.nodes[self.row_index][self.column_index + 1] + + @property + def top(self): + if self.row_index <= 0: + raise OutOfBoundsError() + return self.grid.nodes[self.row_index - 1][self.column_index] + + @property + def bottom(self): + if self.row_index > self.grid.height-2: + raise OutOfBoundsError() + return self.grid.nodes[self.row_index + 1][self.column_index] + + +if __name__ == '__main__': + def print_grid(grid): + print "X"*100 + print grid + + def square(size, in_between_searches=lambda x: x): + import random + sg = SlashGrid([[bool(random.randint(0, 1)) for _ in range(size)] for _ in range(size)]) + size = sg.run(in_between_searches) + return size + # SlashGrid([ + # [True, False, True], + # [False, True, True] + # ]).run(print_grid) + # SlashGrid([ + # [True, True, True], + # [False, False, False], + # [True, False, True] + # ]).run(print_grid) + # SlashGrid([ + # [True, True, True, False, True], + # [False, False, False, True, False], + # [True, False, True, False, False], + # [True, True, True, False, True], + # ]).run(print_grid) + # SlashGrid([ + # [True, True, True, False, True, False], + # [False, False, True, False, False, False], + # [True, True, True, False, False, False], + # [True, False, False, True, True, True], + # [True, False, False, True, False, False], + # [True, True, True, False, True, False] + # ]).run(print_grid) + print square(20, in_between_searches=print_grid)