Add ruby solution

Author: tsikov

ruby/bin/minesweeper

@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby
+
+require_relative '../src/minesweeper.rb'
+require_relative '../src/minesweeper_helpers.rb'
+
+lines_to_fields(ARGF).each_with_index do |field, i|
+  puts "Field #{i+1}:\n"
+  (0..field.length-1).each do |y|
+    puts ((0..field.width-1).map do |x|
+      c = Coord.new(x, y)
+      if field.boom(c)
+        '*'
+      else
+        field.hint(c)
+      end
+    end).join('')
+  end
+end

ruby/bin/minesweeper_done

@@ -0,0 +1,38 @@
+#!/usr/bin/env ruby
+
+require_relative '../src/minesweeper.rb'
+
+y = nil
+fields = []
+field = nil
+
+ARGF.each do |line|
+  if y.nil? or y == field.length
+    raise "Invalid input: Expected W L" unless line =~ /^(\d+) (\d+)$/
+    break if $1.to_i == 0 and $2.to_i == 0
+    field = MineField.new($2.to_i, $1.to_i)
+    fields.push(field)
+    y = 0
+  else
+    (0..field.width-1).each do |x|
+      if line[x] == '*'
+        field.drop_mine(Coord.new(x, y))
+      end
+    end
+    y += 1
+  end
+end
+
+fields.each_with_index do |field, i|
+  puts "Field #{i+1}:\n"
+  (0..field.length-1).each do |y|
+    puts ((0..field.width-1).map do |x|
+      c = Coord.new(x, y)
+      if field.boom(c)
+        '*'
+      else
+        field.hint(c)
+      end
+    end).join('')
+  end
+end

ruby/src/minesweeper.rb

@@ -0,0 +1,56 @@
+class MineField
+  attr_reader :width
+  attr_reader :length
+
+  def initialize(width, length)
+    @width = width
+    @length = length
+    @mines = []
+  end
+  
+  def drop_mine(coord)
+    raise "coord.x must less than #{@width}"  unless coord.x < @width
+    raise "coord.y must less than #{@length}" unless coord.y < @length
+
+    @mines.push coord
+  end
+
+  def boom(coord)
+    @mines.any? do |mine|
+      mine == coord
+    end
+  end
+
+  def hint(coord)
+    h = 0
+
+    @mines.each do |mine|
+      h += 1 if mine.adjacent_to(coord)
+    end
+
+    h
+  end
+end
+
+class Coord
+  attr_reader :x
+  attr_reader :y
+
+  def initialize(x, y)
+    raise "x must be greater or equal to 0" unless x >= 0
+    raise "y must be greater or equal to 0" unless y >= 0
+
+    @x = x
+    @y = y
+  end
+
+  def adjacent_to(coord)
+    (@x - coord.x).abs <= 1 and
+    (@y - coord.y).abs <= 1 and
+    self != coord
+  end
+
+  def ==(coord)
+    coord.x == @x and coord.y == @y
+  end
+end

ruby/src/minesweeper_helpers.rb

@@ -0,0 +1,24 @@
+def lines_to_fields(lines)
+  y = nil
+  fields = []
+  field = nil
+
+  lines.each do |line|
+    if y.nil? or y == field.length
+      raise "Invalid input: Expected W L" unless line =~ /^(\d+) (\d+)$/
+      break if $1.to_i == 0 and $2.to_i == 0
+      field = MineField.new($2.to_i, $1.to_i)
+      fields.push(field)
+      y = 0
+    else
+      (0..field.width-1).each do |x|
+        if line[x] == '*'
+          field.drop_mine(Coord.new(x, y))
+        end
+      end
+      y += 1
+    end
+  end
+
+  fields
+end

ruby/test.txt

@@ -0,0 +1,10 @@
+4 4
+*...
+....
+.*..
+....
+3 5
+**...
+.....
+.*...
+0 0

ruby/test/test_minesweeper.rb

@@ -0,0 +1,22 @@
+require "minitest/autorun"
+require_relative "../src/minesweeper.rb"
+
+class TestMinesweeper < Minitest::Test
+  def test_coords()
+    assert(Coord.new(1, 1).adjacent_to(Coord.new(1, 0)))
+    assert(Coord.new(1, 1).adjacent_to(Coord.new(0, 1)))
+    assert(Coord.new(1, 1).adjacent_to(Coord.new(2, 2)))
+
+    assert(!Coord.new(1, 1).adjacent_to(Coord.new(1, 1)))
+    assert(!Coord.new(1, 1).adjacent_to(Coord.new(2, 3)))
+  end
+
+  def test_field()
+    field = MineField.new(4, 4)
+    field.drop_mine(Coord.new(2, 2))
+
+    assert_equal(1, field.hint(Coord.new(1, 2)))
+    assert_equal(1, field.hint(Coord.new(3, 3)))
+    assert_equal(0, field.hint(Coord.new(0, 2)))
+  end
+end

ruby/test/test_minesweeper_helpers.rb

@@ -0,0 +1,31 @@
+require "minitest/autorun"
+require_relative "../src/minesweeper.rb"
+require_relative "../src/minesweeper_helpers.rb"
+
+class TestMinesweeperHelpers < Minitest::Test
+  def test_lines_to_fields
+    fields = lines_to_fields([
+      '4 4',
+      '*...',
+      '....',
+      '.*..',
+      '....',
+      '3 5',
+      '**...',
+      '.....',
+      '.*...',
+      '0 0'
+    ])
+
+    assert_equal(2, fields.length)
+
+    assert(fields[0].boom(Coord.new(0, 0)))
+    assert(fields[0].boom(Coord.new(2, 1)))
+    assert(!fields[0].boom(Coord.new(2, 2)))
+
+    assert(fields[1].boom(Coord.new(0, 0)))
+    assert(fields[1].boom(Coord.new(0, 1)))
+    assert(fields[1].boom(Coord.new(2, 1)))
+    assert(!fields[1].boom(Coord.new(2, 2)))
+  end
+end