Board: Method to unintelligently convert string coordinates to array

Take string coordinates in the form ":integer:,:integer:" and convert
them to [integer, integer]. We'll be using these converted coordinate
values to place a piece on the board.

2 files changed, 26 insertions, 0 deletions

diff --git a/board.rb b/board.rb
index 93b726a..c990218 100644
--- a/board.rb
+++ b/board.rb
@@ -10,4 +10,17 @@ class Board
   def render
     "...\n" * 3
   end
+  
+  # Raises an ArgumentError if integer conversion fails
+  def transform_coordinates(str)
+    coordinates = str.split(',')
+    
+    begin
+      coordinates[0] = Integer(coordinates[0])
+      coordinates[1] = Integer(coordinates[1])
+      
+      coordinates if coordinates.length > 1
+    rescue
+    end
+  end
 end
diff --git a/spec/board_spec.rb b/spec/board_spec.rb
index 86b4276..8d2b8da 100644
--- a/spec/board_spec.rb
+++ b/spec/board_spec.rb
@@ -22,4 +22,17 @@ EOF
       ]
     end
   end
+  
+  describe '#transform_coordinates' do
+    it 'converts string coordinates to an array' do
+      @board.transform_coordinates('0,4').must_equal [0, 4]
+    end
+    
+    it "returns nil if coordinates don't match the format" do
+      @board.transform_coordinates('4').must_be_nil
+      @board.transform_coordinates('4 2').must_be_nil
+      @board.transform_coordinates('booyakacha').must_be_nil
+      @board.transform_coordinates('booya,kacha').must_be_nil
+    end
+  end
 end