Class: Rubocop::Cop::Style::For

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

Overview

This cop looks for uses of the for keyword, or each method. The preferred alternative is set in the EnforcedStyle configuration parameter. An each call with a block on a single line is always allowed, however.

Constant Summary

Constants inherited from Cop

Cop::OPERATOR_METHODS

Constants included from Util

Util::PROC_NEW_NODE

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offences, #processed_source

Instance Method Summary collapse

Methods included from ConfigurableEnforcedStyle

#alternative_style, #both_styles_detected, #correct_style_detected, #opposite_style_detected, #style, #unrecognized_style_detected

Methods inherited from Cop

#add_offence, all, #autocorrect?, #config_to_allow_offences, #config_to_allow_offences=, #cop_config, cop_name, #cop_name, cop_type, #debug?, #exclude_file?, #exclude_paths, #ignore_node, #include_file?, #include_paths, inherited, #initialize, lint?, #message, non_rails, rails?, #relevant_file?, style?, #support_autocorrect?

Methods included from Util

block_length, command?, comment_line?, const_name, first_part_of_call_chain, lambda?, lambda_or_proc?, line_range, on_node, proc?, range_with_surrounding_space, source_range, strip_quotes

Constructor Details

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

Instance Method Details

#on_block(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/for.rb', line 23

def on_block(node)
  return if block_length(node) == 0

  method, _args, _body = *node
  return unless method.type == :send

  _receiver, method_name, *args = *method
  return unless method_name == :each && args.empty?

  if style == :for
    end_pos = method.loc.expression.end_pos
    range = Parser::Source::Range.new(processed_source.buffer,
                                      end_pos - 'each'.length,
                                      end_pos)
    add_offence(range, range, 'Prefer *for* over *each*.') do
      opposite_style_detected
    end
  else
    correct_style_detected
  end
end

#on_for(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/for.rb', line 13

def on_for(node)
  if style == :each
    add_offence(node, :keyword, 'Prefer *each* over *for*.') do
      opposite_style_detected
    end
  else
    correct_style_detected
  end
end