1 files changed, 46 insertions, 0 deletions
diff --git a/mrbgems/mruby-rational/mrblib/rational.rb b/mrbgems/mruby-rational/mrblib/rational.rb
new file mode 100644
index 000000000..457c0488a
--- /dev/null
+++ b/mrbgems/mruby-rational/mrblib/rational.rb
@@ -0,0 +1,46 @@
+class Rational < Numeric
+  def initialize(numerator = 0, denominator = 1)
+    @numerator = numerator
+    @denominator = denominator
+  end
+
+  attr_reader :numerator, :denominator
+end
+
+def Rational(numerator = 0, denominator = 1)
+  Rational.new(numerator, denominator)
+end
+
+module ForwardOperatorToRational
+  def __forward_operator_to_rational(op, &b)
+    original_operator_name = "__original_operator_#{op}_rational"
+    alias_method original_operator_name, op
+    define_method op do |rhs|
+      if rhs.is_a? Rational
+        Rational.new(self).send(op, rhs)
+      else
+        send(original_operator_name, rhs)
+      end
+    end
+  end
+
+  def __forward_operators_to_rational
+    __forward_operator_to_rational :+
+    __forward_operator_to_rational :-
+    __forward_operator_to_rational :*
+    __forward_operator_to_rational :/
+
+    singleton_class.undef_method :__forward_operator_to_rational
+    singleton_class.undef_method :__forward_operators_to_rational
+  end
+end
+
+class Fixnum
+  extend ForwardOperatorToRational
+  __forward_operators_to_rational
+end
+
+class Float
+  extend ForwardOperatorToRational
+  __forward_operators_to_rational
+end
+\ No newline at end of file