lib/facet/regexp/arity.rb in facets-0.9.0 vs lib/facet/regexp/arity.rb in facets-1.0.0

@@ -1,40 +1,80 @@
-require 'nano/regexp/arity.rb'
\ No newline at end of file
+class Regexp
+  # Returns the number of backreferencing subexpressions.
+  #
+  #   /(a)(b)(c)/.arity  #=> 3
+  #   /(a(b(c)))/.arity  #=> 3
+  #
+  # Note: This is not perfect, especially with regards to \x
+  # and embedded comments.
+  def arity
+    self.source.scan( /(?!\\)[(](?!\?[#=:!>-imx])/ ).length
+  end
+end
+
+
+
+#  _____         _
+# |_   _|__  ___| |_
+#   | |/ _ \/ __| __|
+#   | |  __/\__ \ |_
+#   |_|\___||___/\__|
+#
+=begin test
+
+  require 'test/unit'
+
+  class TCRegexp < Test::Unit::TestCase
+
+    def test_arity
+      r = /(1)(2)(3)/
+      assert_equal( 3, r.arity )
+      r = /(1)(2)(3)(4)/
+      assert_equal( 4, r.arity )
+      r = /(1)(2)((a)3)/
+      assert_equal( 4, r.arity )
+      r = /(?#nothing)(1)(2)(3)(?=3)/
+      assert_equal( 3, r.arity )
+    end
+
+  end
+
+=end