Module: GameOfLife::Generators::Input

Defined in:
lib/game_of_life/generators/input.rb

Overview

Generate a new Universe/Board from a parsed local file or remote URL/file

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.new(options) ⇒ GameOfLife::Universe

Generate a new Universe/Board from a parsed local file or remote URL/file

Parameters:

  • options (Hash) —

    CLI options to generate initial conditions

Options Hash (options):

  • "input" (String) —

    path to a local file or URL to open

  • "width" (Numeric) — default: floored —

    and used as the width of the universe

  • "height" (Numeric) — default: floored —

    and used as the height of the universe

Returns:

See Also:



19
20
21
22
23
24
25
 
# File 'lib/game_of_life/generators/input.rb', line 19

def new(options)
  width  = options["width"].to_i
  height = options["height"].to_i
  uri    = options["input"]
  input  = generate_input_data(uri: uri)
  populate(input: input, width: width, height: height)
end

Instance Method Details

#generate_input_data(uri:) ⇒ Array<Array<True|False>> (private)

Generate the seeding data for populating the Universe from input URI

Parameters:

  • uri (String) —

    inputh path to local file or URL to open

Returns:

  • (Array<Array<True|False>>) —

    covering the defined size of universe

See Also:



31
32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/game_of_life/generators/input.rb', line 31

private def generate_input_data(uri:)
  # By design, it's intentional that we use URI.open to to allow seamless file and url access
  raw = URI.open(uri).read.split("\n") # rubocop:disable Security/Open

  # Parse the file and convert it to a boolean 2D array
  # where any alpha numeric character is considered a living cell (true)
  raw.map! { |row| row.chars.map { |char| char.match?(/[[:alnum:]]/) } }
rescue ::OpenURI::HTTPError, ::SocketError
  raise GameOfLife::Error, "URL isn't avaialable, please check it again and make sure the URL is correct"
rescue ::Errno::ENOENT
  raise GameOfLife::Error,
        "File isn't avaialable, please check it again and make sure the path to the input file is correct"
end

#populate(input:, width:, height:) ⇒ GameOfLife::Universe (private)

Populate the Universe with reference to the parsed input 2D array (True/False)

Parameters:

  • input (Array<Array<True|False>>)
  • width (Integer) —

    width of the generated cyclic universe

  • height (Integer) —

    height of the generated cyclic universe

Returns:

See Also:



51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/game_of_life/generators/input.rb', line 51

private def populate(input:, width:, height:)
  # Generate a universe based on the parsed raw file and fill it with the cells
  universe = GameOfLife::Universe.new(height: height, width: width)
  (0...height).each do |i|
    (0...width).each do |j|
      cell = { x: j, y: i, alive: input.fetch(i, nil)&.fetch(j, nil) }
      universe[i][j] = ::GameOfLife::Cell.new(**cell)
    end
  end
  universe
end