Add new RangeNode extension

.rubocop_todo.yml

@@ -1,12 +1,12 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2018-12-27 11:29:54 +0800 using RuboCop version 0.61.1.
+# on 2019-01-03 17:29:56 +0800 using RuboCop version 0.62.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 75
+# Offense count: 77
 Metrics/AbcSize:
   Max: 17
 
@@ -15,31 +15,31 @@ Metrics/AbcSize:
 Metrics/ClassLength:
   Max: 181
 
-# Offense count: 220
+# Offense count: 222
 # Configuration parameters: CountComments, ExcludedMethods.
 Metrics/MethodLength:
   Max: 14
 
 # Offense count: 5
 # Configuration parameters: CountComments.
 Metrics/ModuleLength:
-  Max: 139
+  Max: 141
 
-# Offense count: 10
+# Offense count: 12
 RSpec/AnyInstance:
   Exclude:
     - 'spec/rubocop/cli_spec.rb'
     - 'spec/rubocop/cop/lint/duplicate_methods_spec.rb'
     - 'spec/rubocop/runner_spec.rb'
     - 'spec/rubocop/target_finder_spec.rb'
 
-# Offense count: 1067
+# Offense count: 1071
 # Configuration parameters: Prefixes.
 # Prefixes: when, with, without
 RSpec/ContextWording:
   Enabled: false
 
-# Offense count: 3304
+# Offense count: 3313
 # Configuration parameters: Max.
 RSpec/ExampleLength:
   Enabled: false
@@ -60,7 +60,7 @@ RSpec/ExpectOutput:
     - 'spec/rubocop/target_finder_spec.rb'
     - 'spec/support/cli_spec_behavior.rb'
 
-# Offense count: 525
+# Offense count: 528
 # Configuration parameters: AggregateFailuresByDefault.
 RSpec/MultipleExpectations:
   Max: 25

lib/rubocop.rb

@@ -48,6 +48,7 @@
 require_relative 'rubocop/ast/node/keyword_splat_node'
 require_relative 'rubocop/ast/node/or_node'
 require_relative 'rubocop/ast/node/pair_node'
+require_relative 'rubocop/ast/node/range_node'
 require_relative 'rubocop/ast/node/regexp_node'
 require_relative 'rubocop/ast/node/resbody_node'
 require_relative 'rubocop/ast/node/send_node'

lib/rubocop/ast/builder.rb

@@ -27,6 +27,8 @@ class Builder < Parser::Builders::Default
         for: ForNode,
         hash: HashNode,
         if: IfNode,
+        irange: RangeNode,
+        erange: RangeNode,
         kwsplat: KeywordSplatNode,
         or: OrNode,
         pair: PairNode,

lib/rubocop/ast/node/range_node.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module AST
+    # A node extension for `irange` and `erange` nodes. This will be used in
+    # place of a plain node when the builder constructs the AST, making its
+    # methods available to all `irange` and `erange` nodes within RuboCop.
+    class RangeNode < Node
+    end
+  end
+end

spec/rubocop/ast/range_node_spec.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+RSpec.describe RuboCop::AST::RangeNode do
+  let(:range_node) { parse_source(source).ast }
+
+  describe '.new' do
+    context 'with an inclusive range' do
+      let(:source) do
+        '1..2'
+      end
+
+      it { expect(range_node.is_a?(described_class)).to be(true) }
+    end
+
+    context 'with an exclusive range' do
+      let(:source) do
+        '1...2'
+      end
+
+      it { expect(range_node.is_a?(described_class)).to be(true) }
+    end
+
+    context 'with an infinite range' do
+      let(:ruby_version) { 2.6 }
+      let(:source) do
+        '1..'
+      end
+
+      it { expect(range_node.is_a?(described_class)).to be(true) }
+    end
+  end
+end