Adds Module#< and Module#<=

1 files changed, 39 insertions, 0 deletions

diff --git a/mrbgems/mruby-class-ext/mrblib/module.rb b/mrbgems/mruby-class-ext/mrblib/module.rb
new file mode 100644
index 000000000..d35b4cbae
--- /dev/null
+++ b/mrbgems/mruby-class-ext/mrblib/module.rb
@@ -0,0 +1,39 @@
+class Module
+
+  ##
+  # call-seq:
+  #   mod < other   ->  true, false, or nil
+  #
+  # Returns true if <i>mod</i> is a subclass of <i>other</i>. Returns
+  # <code>nil</code> if there's no relationship between the two.
+  # (Think of the relationship in terms of the class definition:
+  # "class A < B" implies "A < B".)
+  #
+  def <(other)
+    raise TypeError, 'compared with non class/module' unless other.is_a?(Module)
+    if self.equal?(other)
+      false
+    else
+      self <= other
+    end
+  end
+
+  ##
+  # call-seq:
+  #   mod <= other   ->  true, false, or nil
+  #
+  # Returns true if <i>mod</i> is a subclass of <i>other</i> or
+  # is the same as <i>other</i>. Returns
+  # <code>nil</code> if there's no relationship between the two.
+  # (Think of the relationship in terms of the class definition:
+  # "class A < B" implies "A < B".)
+  def <=(other)
+    raise TypeError, 'compared with non class/module' unless other.is_a?(Module)
+    if self.ancestors.include?(other)
+      return true
+    elsif other.ancestors.include?(self)
+      return false
+    end
+  end
+
+end