Class: RuboCop::Cop::Style::FrozenStringLiteralComment

Inherits:
Cop
  • Object
show all
Includes:
ConfigurableEnforcedStyle, FrozenStringLiteral
Defined in:
lib/rubocop/cop/style/frozen_string_literal_comment.rb

Overview

This cop is designed to help upgrade to Ruby 3.0. It will add the comment ‘# frozen_string_literal: true` to the top of files to enable frozen string literals. Frozen string literals will be default in Ruby 3.0. The comment will be added below a shebang and encoding comment. The frozen string literal comment is only valid in Ruby 2.3+.

Constant Summary collapse

MSG = 
'Missing frozen string literal comment.'.freeze
SHEBANG = 
'#!'.freeze

Constants included from FrozenStringLiteral

FrozenStringLiteral::FROZEN_STRING_LITERAL, FrozenStringLiteral::FROZEN_STRING_LITERAL_ENABLED, FrozenStringLiteral::FROZEN_STRING_LITERAL_TYPES

Constants included from Util

Util::ASGN_NODES, Util::BYTE_ORDER_MARK, Util::EQUALS_ASGN_NODES, Util::LITERAL_REGEX, Util::OPERATOR_METHODS, Util::SHORTHAND_ASGN_NODES, Util::STRING_ESCAPES, Util::STRING_ESCAPE_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods included from FrozenStringLiteral

frozen_string_literal_comment_exists?, frozen_string_literals_enabled?

Methods included from ConfigurableEnforcedStyle

#alternative_style, #ambiguous_style_detected, #correct_style_detected, #detected_style, #detected_style=, #no_acceptable_style!, #no_acceptable_style?, #opposite_style_detected, #parameter_name, #style, #style_detected, #supported_styles, #unexpected_style_detected

Methods inherited from Cop

#add_offense, all, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, cop_type, #correct, #debug?, #details, #display_cop_names?, #display_style_guide?, #excluded_file?, #extra_details?, inherited, #initialize, #join_force?, lint?, match?, #message, non_rails, #parse, qualified_cop_name, #reference_url, #relevant_file?, #style_guide_url, #target_ruby_version

Methods included from Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search_body

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?, block_length, comment_line?, directions, double_quotes_acceptable?, double_quotes_required?, effective_column, ends_its_line?, first_part_of_call_chain, interpret_string_escapes, line_range, move_pos, numeric_range_size, on_node, operator?, parentheses?, parenthesized_call?, range_with_surrounding_comma, range_with_surrounding_space, source_range, strip_quotes, ternary_op?, to_string_literal, to_symbol_literal, within_node?

Methods included from PathUtil

absolute?, hidden?, issue_deprecation_warning, match_path?, relative_path

Constructor Details

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

Instance Method Details

#autocorrect(_node) ⇒ Object 



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# File 'lib/rubocop/cop/style/frozen_string_literal_comment.rb', line 28

def autocorrect(_node)
  lambda do |corrector|
    last_special_comment = last_special_comment(processed_source)
    if last_special_comment.nil?
      corrector.insert_before(processed_source.tokens[0].pos,
                              "#{FROZEN_STRING_LITERAL_ENABLED}\n")
    else
      corrector.insert_after(last_special_comment.pos,
                             "\n#{FROZEN_STRING_LITERAL_ENABLED}")
    end
  end
end

#investigate(processed_source) ⇒ Object 



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# File 'lib/rubocop/cop/style/frozen_string_literal_comment.rb', line 19

def investigate(processed_source)
  return if style == :when_needed && target_ruby_version < 2.3
  return if processed_source.buffer.source.empty?

  return if frozen_string_literal_comment_exists?(processed_source)

  offense(processed_source)
end