Initial Commit

.gitignore

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+*.gem
+.bundle
+Gemfile.lock
+pkg/*
+.rvmrc

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in ruby_cop.gemspec
+gemspec

Rakefile

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+require 'bundler'
+Bundler::GemHelper.install_tasks

lib/ruby_cop.rb

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+module RubyCop
+  # Your code goes here...
+end
+
+require 'ripper'
+
+require 'ruby_cop/ruby'
+require 'ruby_cop/node_builder'
+require 'ruby_cop/gray_list'
+require 'ruby_cop/policy'
+
+

lib/ruby_cop/gray_list.rb

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+require 'set'
+
+module RubyCop
+  # Combination blacklist and whitelist.
+  class GrayList
+    def initialize
+      @blacklist = Set.new
+      @whitelist = Set.new
+    end
+
+    # An item is allowed if it's whitelisted, or if it's not blacklisted.
+    def allow?(item)
+      @whitelist.include?(item) || !@blacklist.include?(item)
+    end
+
+    def blacklist(item)
+      @whitelist.delete(item)
+      @blacklist.add(item)
+    end
+
+    def whitelist(item)
+      @blacklist.delete(item)
+      @whitelist.add(item)
+    end
+  end
+end