Class: RuboCop::Cop::Lint::UnneededRequireStatement

Inherits:
Cop
  • Object
show all
Extended by:
TargetRubyVersion
Defined in:
lib/rubocop/cop/lint/unneeded_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.'.freeze

Constants included from Util

Util::ASGN_NODES, Util::BYTE_ORDER_MARK, Util::CONDITIONAL_NODES, Util::EQUALS_ASGN_NODES, Util::LITERAL_REGEX, Util::LOGICAL_OPERATOR_NODES, Util::MODIFIER_NODES, Util::OPERATOR_METHODS, Util::SHORTHAND_ASGN_NODES

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods included from TargetRubyVersion

minimum_target_ruby_version, support_target_ruby_version?

Methods inherited from Cop

#add_offense, all, autocorrect_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, #correct, department, #duplicate_location?, #excluded_file?, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #message, #messages, non_rails, #parse, qualified_cop_name, #relevant_file?, #target_rails_version, #target_ruby_version

Methods included from AST::Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, comment_line?, double_quotes_required?, effective_column, ends_its_line?, escape_string, first_part_of_call_chain, interpret_string_escapes, line_range, needs_escaping?, on_node, operator?, parentheses?, parenthesized_call?, precede?, range_between, range_by_whole_lines, range_with_surrounding_comma, range_with_surrounding_space, same_line?, source_range, strip_quotes, stripped_source_upto, symbol_without_quote?, to_string_literal, to_supported_styles, to_symbol_literal, within_node?

Methods included from PathUtil

absolute?, find_file_upwards, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#autocorrect(node) ⇒ Object 



41
42
43
44
45
46
47
 
# File 'lib/rubocop/cop/lint/unneeded_require_statement.rb', line 41

def autocorrect(node)
  lambda do |corrector|
    range = range_with_surrounding_space(range: node.loc.expression,
                                         side: :right)
    corrector.remove(range)
  end
end

#on_send(node) ⇒ Object 



36
37
38
39
 
# File 'lib/rubocop/cop/lint/unneeded_require_statement.rb', line 36

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