Remove duplication between next and break mutator

config/flay.yml

@@ -1,3 +1,3 @@
 ---
 threshold: 18
-total_score: 787
+total_score: 784

lib/mutant.rb

@@ -64,7 +64,6 @@ require 'mutant/mutator/node/argument'
 require 'mutant/mutator/node/arguments'
 require 'mutant/mutator/node/blockarg'
 require 'mutant/mutator/node/begin'
-require 'mutant/mutator/node/break'
 require 'mutant/mutator/node/connective/binary'
 require 'mutant/mutator/node/const'
 require 'mutant/mutator/node/dstr'
@@ -73,7 +72,7 @@ require 'mutant/mutator/node/kwbegin'
 require 'mutant/mutator/node/named_value/access'
 require 'mutant/mutator/node/named_value/constant_assignment'
 require 'mutant/mutator/node/named_value/variable_assignment'
-require 'mutant/mutator/node/next'
+require 'mutant/mutator/node/loop_ctrl'
 require 'mutant/mutator/node/noop'
 require 'mutant/mutator/node/op_asgn'
 require 'mutant/mutator/node/while'

lib/mutant/mutator/node/break.rb

@@ -1,30 +0,0 @@
-# encoding: utf-8
-
-module Mutant
-  class Mutator
-    class Node
-
-      # Break mutator
-      class Break < Generic
-
-        handle(:break)
-
-      private
-
-        # Emit mutations
-        #
-        # @return [undefined]
-        #
-        # @api private
-        #
-        def dispatch
-          super
-          children.each_index(&method(:delete_child))
-          emit(s(:next, *children))
-          emit_nil
-        end
-
-      end # Break
-    end # Node
-  end # Mutator
-end # Mutant

lib/mutant/mutator/node/loop_ctrl.rb

@@ -4,10 +4,15 @@ module Mutant
   class Mutator
     class Node
 
-      # Next mutator
-      class Next < Generic
+      # Mutator for loop control keywords
+      class LoopControl < Generic
 
-        handle(:next)
+        INVERSE = IceNine.deep_freeze(
+          :next => :break,
+          :break => :next
+        )
+
+        handle(*INVERSE.keys)
 
       private
 
@@ -20,7 +25,7 @@ module Mutant
         def dispatch
           super
           children.each_index(&method(:delete_child))
-          emit(s(:break, *children))
+          emit(s(INVERSE.fetch(node.type), *children))
           emit_nil
         end
 

spec/unit/mutant/mutator/node/break/mutation_spec.rb

@@ -1,18 +0,0 @@
-# encoding: utf-8
-
-require 'spec_helper'
-
-describe Mutant::Mutator::Node::Break, 'break' do
-  let(:source) { 'break true' }
-
-  let(:mutations) do
-    mutations = []
-    mutations << 'break false'
-    mutations << 'break nil'
-    mutations << 'break'
-    mutations << 'nil'
-    mutations << 'next true'
-  end
-
-  it_should_behave_like 'a mutator'
-end

spec/unit/mutant/mutator/node/loop_ctrl_spec.rb

@@ -0,0 +1,37 @@
+# encoding: utf-8
+
+require 'spec_helper'
+
+describe Mutant::Mutator::Node::LoopControl do
+
+  context 'with break node' do
+    let(:source) { 'break true' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'break false'
+      mutations << 'break nil'
+      mutations << 'break'
+      mutations << 'nil'
+      mutations << 'next true'
+    end
+
+    it_should_behave_like 'a mutator'
+
+  end
+
+  context 'with next node' do
+    let(:source)  { 'next true' }
+
+    let(:mutations) do
+      mutations = []
+      mutations << 'next false'
+      mutations << 'next nil'
+      mutations << 'next'
+      mutations << 'nil'
+      mutations << 'break true'
+    end
+
+    it_should_behave_like 'a mutator'
+  end
+end

spec/unit/mutant/mutator/node/next/mutation_spec.rb

@@ -1,18 +0,0 @@
-# encoding: utf-8
-
-require 'spec_helper'
-
-describe Mutant::Mutator::Node::Next, 'next' do
-  let(:source)  { 'next true' }
-
-  let(:mutations) do
-    mutations = []
-    mutations << 'next false'
-    mutations << 'next nil'
-    mutations << 'next'
-    mutations << 'nil'
-    mutations << 'break true'
-  end
-
-  it_should_behave_like 'a mutator'
-end