FixedOdds.rb in rodders-0.2.0

- old
+ new

@@ -24,25 +24,25 @@
 
   # tells if the odds are in fractional form
   # @param [String] odds the odds representation
   # @return [Boolean] to indicate if it matches
   def FixedOdds.fractional_odds?(odds)
-    odds =~ /\d+\/\d+|\d+-to-\d+|evens|even money/
+    odds =~ /^(\d+(\/|-to-)\d+( (against|on))?|evens|even money)$/
   end
 
   # tells if the odds are in moneyline form
   # @param (see FixedOdds.fractional_odds?)
   # @return (see FixedOdds.fractional_odds?)
   def FixedOdds.moneyline_odds?(odds)
-    odds =~ /[+-]\d+/ 
+    odds =~ /^[+-]\d+$/ 
   end
 
   # tells if the odds are in decimal form
   # @param (see FixedOdds.fractional_odds?)
   # @return (see FixedOdds.fractional_odds?)
   def FixedOdds.decimal_odds?(odds)
-    odds =~ /^(\d+|\d+\.\d+|\.\d+)/ 
+    odds =~ /^(\d+|\d+\.\d+|\.\d+)$/ 
   end
 
   # creates a new FixedOdds from fractional form. These can be in the form
   # * 4-to-1
   # * 4-to-1 against
@@ -102,9 +102,17 @@
   # (which is the profit plus the initial stake)
   # @param (see #profit_on_winning_stake)
   # @return [Money] the total winnings
   def total_return_on_winning_stake(stake)
     profit_on_winning_stake(stake) + stake.to_money
+  end
+
+  # calculates the magnitude of the stake needed to
+  # win the specified amount in profit
+  # @param [String] win the desired profit
+  # @return [Money] the stake required to realise that profit on a winning bet
+  def stake_needed_to_win win
+    win.to_money / @fractional_odds
   end
 
   # string representation in fractional form like '4/1'
   # @return [String] fractional form representation
   def to_s