Create gem

.gitignore

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+# rcov generated
+coverage
+coverage.data
+
+# rdoc generated
+rdoc
+
+# yard generated
+doc
+.yardoc
+
+# bundler
+.bundle
+./Gemfile.lock
+./Gemfile.local
+
+# rbenv
+.ruby-version
+
+# rspec
+/spec/examples.txt
+/.test_queue_stats
+
+# jeweler generated
+pkg
+
+# etags
+TAGS
+
+# Have editor/IDE/OS specific files you need to ignore? Consider using a global gitignore:
+#
+# * Create a file at ~/.gitignore
+# * Include files you want ignored
+# * Run: git config --global core.excludesfile ~/.gitignore
+#
+# After doing this, these files will be ignored in all your git projects,
+# saving you from having to 'pollute' every project you touch with them
+#
+# Not sure what to needs to be ignored for particular editors/OSes? Here's some ideas to get you started. (Remember, remove the leading # of the line)
+#
+# For MacOS:
+#
+#.DS_Store
+
+# For TextMate
+#*.tmproj
+#tmtags
+
+# For emacs:
+#*~
+#\#*
+#.\#*
+
+# For vim:
+*.swp
+
+# For redcar:
+#.redcar
+
+# For rubinius:
+#*.rbc

.rspec

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+--color
+--require spec_helper

.rubocop.yml

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+# This is the configuration used to check the rubocop source code.
+
+inherit_from: .rubocop_todo.yml
+require:
+  - rubocop/cop/internal_affairs
+  - rubocop-performance
+  - rubocop-rspec
+
+AllCops:
+  NewCops: enable
+  Exclude:
+    - 'vendor/**/*'
+    - 'spec/fixtures/**/*'
+    - 'tmp/**/*'
+    - '.git/**/*'
+  TargetRubyVersion: 2.4
+
+Naming/PredicateName:
+  # Method define macros for dynamically generated method.
+  MethodDefinitionMacros:
+    - define_method
+    - define_singleton_method
+    - def_node_matcher
+    - def_node_search
+
+Style/FormatStringToken:
+  # Because we parse a lot of source codes from strings. Percent arrays
+  # look like unannotated format string tokens to this cop.
+  Exclude:
+    - spec/**/*
+
+Style/IpAddresses:
+  # The test for this cop includes strings that would cause offenses
+  Exclude:
+  - spec/rubocop/cop/style/ip_addresses_spec.rb
+
+Layout/EndOfLine:
+  EnforcedStyle: lf
+
+Layout/ClassStructure:
+  Enabled: true
+  Categories:
+    module_inclusion:
+      - include
+      - prepend
+      - extend
+  ExpectedOrder:
+      - module_inclusion
+      - constants
+      - public_class_methods
+      - initializer
+      - instance_methods
+      - protected_methods
+      - private_methods
+
+# Trailing white space is meaningful in code examples
+Layout/TrailingWhitespace:
+  AllowInHeredoc: true
+
+Lint/AmbiguousBlockAssociation:
+  Exclude:
+    - 'spec/**/*.rb'
+
+Layout/HashAlignment:
+  EnforcedHashRocketStyle:
+    - key
+    - table
+  EnforcedColonStyle:
+    - key
+    - table
+
+Lint/InterpolationCheck:
+  Exclude:
+    - 'spec/**/*.rb'
+
+Lint/UselessAccessModifier:
+  MethodCreatingMethods:
+    - 'def_matcher'
+    - 'def_node_matcher'
+
+Lint/BooleanSymbol:
+  Enabled: false
+
+Metrics/BlockLength:
+  Exclude:
+    - 'Rakefile'
+    - '**/*.rake'
+    - 'spec/**/*.rb'
+    - '**/*.gemspec'
+
+Metrics/ClassLength:
+  Exclude:
+    - lib/rubocop/config_obsoletion.rb
+
+Metrics/ModuleLength:
+  Exclude:
+    - 'spec/**/*.rb'
+
+RSpec/FilePath:
+  Exclude:
+    - spec/rubocop/formatter/junit_formatter_spec.rb
+
+RSpec/PredicateMatcher:
+  EnforcedStyle: explicit
+
+RSpec/MessageSpies:
+  EnforcedStyle: receive
+
+RSpec/NestedGroups:
+  Max: 7

.rubocop_todo.yml

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+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2020-05-11 03:29:20 -0400 using RuboCop version 0.82.0.
+# 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: 1
+# Configuration parameters: Include.
+# Include: **/*.gemspec
+Gemspec/RequiredRubyVersion:
+  Exclude:
+    - 'rubocop-ast.gemspec'
+
+# Offense count: 2
+InternalAffairs/NodeDestructuring:
+  Exclude:
+    - 'spec/rubocop/ast/resbody_node_spec.rb'
+    - 'spec/rubocop/node_pattern_spec.rb'
+
+# Offense count: 1
+# Configuration parameters: CountComments.
+Metrics/ClassLength:
+  Max: 148
+
+# Offense count: 4
+# Configuration parameters: CountComments, ExcludedMethods.
+Metrics/MethodLength:
+  Max: 13
+
+# Offense count: 1
+# Configuration parameters: CountComments.
+Metrics/ModuleLength:
+  Max: 101
+
+# Offense count: 1
+# Configuration parameters: ExpectMatchingDefinition, Regex, IgnoreExecutableScripts, AllowedAcronyms.
+# AllowedAcronyms: CLI, DSL, ACL, API, ASCII, CPU, CSS, DNS, EOF, GUID, HTML, HTTP, HTTPS, ID, IP, JSON, LHS, QPS, RAM, RHS, RPC, SLA, SMTP, SQL, SSH, TCP, TLS, TTL, UDP, UI, UID, UUID, URI, URL, UTF8, VM, XML, XMPP, XSRF, XSS
+Naming/FileName:
+  Exclude:
+    - 'lib/rubocop-ast.rb'
+
+# Offense count: 1
+RSpec/BeforeAfterAll:
+  Exclude:
+    - 'spec/spec_helper.rb'
+    - 'spec/rails_helper.rb'
+    - 'spec/support/**/*.rb'
+    - 'spec/rubocop/ast/node_spec.rb'
+
+# Offense count: 180
+# Configuration parameters: Prefixes.
+# Prefixes: when, with, without
+RSpec/ContextWording:
+  Exclude:
+    - 'spec/rubocop/ast/array_node_spec.rb'
+    - 'spec/rubocop/ast/block_node_spec.rb'
+    - 'spec/rubocop/ast/float_node_spec.rb'
+    - 'spec/rubocop/ast/hash_node_spec.rb'
+    - 'spec/rubocop/ast/int_node_spec.rb'
+    - 'spec/rubocop/ast/node_spec.rb'
+    - 'spec/rubocop/ast/resbody_node_spec.rb'
+    - 'spec/rubocop/node_pattern_spec.rb'
+    - 'spec/rubocop/processed_source_spec.rb'
+    - 'spec/rubocop/token_spec.rb'
+    - 'spec/spec_helper.rb'
+
+# Offense count: 5
+# Configuration parameters: Max.
+RSpec/ExampleLength:
+  Exclude:
+    - 'spec/rubocop/node_pattern_spec.rb'
+    - 'spec/rubocop/processed_source_spec.rb'
+
+# Offense count: 50
+# Configuration parameters: AggregateFailuresByDefault.
+RSpec/MultipleExpectations:
+  Max: 5
+
+# Offense count: 1
+Style/Documentation:
+  Exclude:
+    - 'spec/**/*'
+    - 'test/**/*'

CHANGELOG.md

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+# Change log
+
+## master (unreleased)
+
+* Gem extracted from RuboCop. ([@marcandre][])
+
+[@marcandre]: https://github.com/marcandre

CONTRIBUTING.md

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+# Contributing
+
+If you discover issues, have ideas for improvements or new features,
+please report them to the [issue tracker][1] of the repository or
+submit a pull request. Please, try to follow these guidelines when you
+do so.
+
+## Issue reporting
+
+* Check that the issue has not already been reported.
+* Check that the issue has not already been fixed in the latest code
+  (a.k.a. `master`).
+* Be clear, concise and precise in your description of the problem.
+* Open an issue with a descriptive title and a summary in grammatically correct,
+  complete sentences.
+* Include the output of `rubocop -V`:
+
+```
+$ rubocop -V
+0.50.0 (using Parser 2.4.0.0, running on ruby 2.4.2 x86_64-linux)
+```
+
+* Include any relevant code to the issue summary.
+
+## Pull requests
+
+* Read [how to properly contribute to open source projects on GitHub][2].
+* Fork the project.
+* Use a topic/feature branch to easily amend a pull request later, if necessary.
+* Write [good commit messages][3].
+* Use the same coding conventions as the rest of the project.
+* Commit and push until you are happy with your contribution.
+* If your change has a corresponding open GitHub issue, prefix the commit message with `[Fix #github-issue-number]`.
+* Make sure to add tests for it. This is important so I don't break it
+  in a future version unintentionally.
+* Add an entry to the [Changelog](CHANGELOG.md) accordingly. See [changelog entry format](#changelog-entry-format).
+* Please try not to mess with the Rakefile, version, or history. If
+  you want to have your own version, or is otherwise necessary, that
+  is fine, but please isolate to its own commit so I can cherry-pick
+  around it.
+* Make sure the test suite is passing and the code you wrote doesn't produce
+  RuboCop offenses (usually this is as simple as running `bundle exec rake`).
+* [Squash related commits together][5].
+* Open a [pull request][4] that relates to *only* one subject with a clear title
+  and description in grammatically correct, complete sentences.
+
+### Changelog entry format
+
+Here are a few examples:
+
+```
+* [#716](https://github.com/rubocop-hq/rubocop-ast/issues/716): Fixed a regression in the auto-correction logic of `MethodDefParentheses`. ([@bbatsov][])
+* New cop `ElseLayout` checks for odd arrangement of code in the `else` branch of a conditional expression. ([@bbatsov][])
+* [#7542](https://github.com/rubocop-hq/rubocop-ast/pull/7542): **(Breaking)** Move `LineLength` cop from `Metrics` department to `Layout` department. ([@koic][])
+```
+
+* Mark it up in [Markdown syntax][6].
+* The entry line should start with `* ` (an asterisk and a space).
+* If the change has a related GitHub issue (e.g. a bug fix for a reported issue), put a link to the issue as `[#123](https://github.com/rubocop-hq/rubocop-ast/issues/123): `.
+* Describe the brief of the change. The sentence should end with a punctuation.
+* If this is a breaking change, mark it with `**(Breaking)**`.
+* At the end of the entry, add an implicit link to your GitHub user page as `([@username][])`.
+* If this is your first contribution to RuboCop project, add a link definition for the implicit link to the bottom of the changelog as `[@username]: https://github.com/username`.
+
+[1]: https://github.com/rubocop-hq/rubocop-ast/issues
+[2]: https://www.gun.io/blog/how-to-github-fork-branch-and-pull-request
+[3]: https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[4]: https://help.github.com/articles/about-pull-requests
+[5]: http://gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html
+[6]: https://daringfireball.net/projects/markdown/syntax

Gemfile

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+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gemspec
+
+gem 'pry'
+gem 'rake', '~> 12.0'
+gem 'rspec', '~> 3.7'
+# Workaround for cc-test-reporter with SimpleCov 0.18.
+# Stop upgrading SimpleCov until the following issue will be resolved.
+# https://github.com/codeclimate/test-reporter/issues/418
+gem 'simplecov', '~> 0.10', '< 0.18'
+gem 'test-queue'
+gem 'yard', '~> 0.9'
+
+local_gemfile = File.expand_path('Gemfile.local', __dir__)
+eval_gemfile local_gemfile if File.exist?(local_gemfile)