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[rails.git] / vendor / gems / rspec-1.1.2 / examples / stories / game-of-life / life / grid.rb
1 class Grid
2   
3   attr_accessor :contents
4   
5   def initialize(rows, cols)
6     @contents = []
7     rows.times do @contents << [0] * cols end
8   end
9   
10   def rows
11     @contents.size
12   end
13   
14   def columns
15     @contents[0].size
16   end
17   
18   def ==(other)
19     self.contents == other.contents
20   end
21   
22   def create_at(row,col)
23     @contents[row][col] = 1
24   end
25   
26   def destroy_at(row,col)
27     @contents[row][col] = 0
28   end
29   
30   def self.from_string(str)
31     row_strings = str.split(' ')
32     grid = new(row_strings.size, row_strings[0].size)
33     
34     row_strings.each_with_index do |row, row_index|
35       row_chars = row.split(//)
36       row_chars.each_with_index do |col_char, col_index|
37         grid.create_at(row_index, col_index) if col_char == 'X'
38       end
39     end
40     return grid
41   end
42   
43 end