Class: RuboCop::Cop::Lint::RedundantRequireStatement

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Includes:
RangeHelp
Defined in:
lib/rubocop/cop/lint/redundant_require_statement.rb

Overview

Checks for unnecessary ‘require` statement.

The following features are unnecessary ‘require` statement because they are already loaded.

ruby -ve 'p $LOADED_FEATURES.reject { |feature| %r|/| =~ feature }'
ruby 2.2.8p477 (2017-09-14 revision 59906) [x86_64-darwin13]
["enumerator.so", "rational.so", "complex.so", "thread.rb"]

This cop targets Ruby 2.2 or higher containing these 4 features.

Examples:

# bad
require 'unloaded_feature'
require 'thread'

# good
require 'unloaded_feature'

Constant Summary collapse

MSG = 
'Remove unnecessary `require` statement.'
RESTRICT_ON_SEND = 
i[require].freeze

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods inherited from Base

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

#exclude_limit

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #correctable?, #disable_uncorrectable?, #safe_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

silence_warnings

Constructor Details

This class inherits a constructor from RuboCop::Cop::Base

Instance Method Details

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/redundant_require_statement.rb', line 37

def on_send(node)
  return unless unnecessary_require_statement?(node)

  add_offense(node) do |corrector|
    range = range_with_surrounding_space(range: node.loc.expression, side: :right)

    corrector.remove(range)
  end
end

#unnecessary_require_statement?(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/redundant_require_statement.rb', line 32

def_node_matcher :unnecessary_require_statement?, "(send nil? :require\n  (str {\"enumerator\" \"rational\" \"complex\" \"thread\"}))\n"