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Class: RuboCop::Cop::Layout::RedundantLineBreak

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::RuboCop::Cop::AutoCorrector, ::RuboCop::Cop::Base, ::RuboCop::ExcludeLimit, NodePattern::Macros, RuboCop::AST::Sexp
Instance Chain:
self, ::RuboCop::Cop::CheckSingleLineSuitability, ::RuboCop::Cop::CheckAssignment, ::RuboCop::Cop::Base, ::RuboCop::Cop::AutocorrectLogic, ::RuboCop::Cop::IgnoredNode, ::RuboCop::Util, RuboCop::AST::Sexp
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/layout/redundant_line_break.rb

Overview

Checks whether certain expressions, e.g. method calls, that could fit completely on a single line, are broken up into multiple lines unnecessarily.

Examples:

any configuration

# bad
foo(
  a,
  b
)

puts 'string that fits on ' \
     'a single line'

things
  .select { |thing| thing.cond? }
  .join('-')

# good
foo(a, b)

puts 'string that fits on a single line'

things.select { |thing| thing.cond? }.join('-')

InspectBlocks: false (default)

# good
foo(a) do |x|
  puts x
end

InspectBlocks: true

# bad
foo(a) do |x|
  puts x
end

# good
foo(a) { |x| puts x }

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

Class Attribute Summary

::RuboCop::Cop::AutoCorrector - Extended

support_autocorrect?

::RuboCop::Cop::Base - Inherited

.gem_requirements, .lint?,
.support_autocorrect?

Returns if class supports autocorrect.
.support_multiple_source?

Override if your cop should be called repeatedly for multiple investigations Between calls to on_new_investigation and on_investigation_end, the result of processed_source will remain constant.

Class Method Summary

::RuboCop::Cop::Base - Inherited

.autocorrect_incompatible_with

List of cops that should not try to autocorrect at the same time as this cop.
.badge

Naming.
.callbacks_needed, .cop_name, .department,
.documentation_url

Returns a url to view this cops documentation online.
.exclude_from_registry

Call for abstract Cop classes.
.inherited,
.joining_forces

Override and return the Force class(es) you need to join.
.match?

Returns true if the cop name or the cop namespace matches any of the given names.
.new,
.requires_gem

Register a version requirement for the given gem name.
.restrict_on_send

::RuboCop::ExcludeLimit - Extended

exclude_limit

Sets up a configuration option to have an exclude limit tracked.
transform

Instance Attribute Summary

::RuboCop::Cop::Base - Inherited

#active_support_extensions_enabled?, #always_autocorrect?, #config, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #processed_source, #string_literals_frozen_by_default?, #target_satisfies_all_gem_version_requirements?

::RuboCop::Cop::AutocorrectLogic - Included

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

Instance Method Summary

::RuboCop::Cop::CheckSingleLineSuitability - Included

#suitable_as_single_line?, #comment_within?, #max_line_length, #safe_to_split?, #to_single_line, #too_long?

::RuboCop::Cop::CheckAssignment - Included

#on_and_asgn

Alias for CheckAssignment#on_lvasgn.
#on_casgn

Alias for CheckAssignment#on_lvasgn.
#on_cvasgn

Alias for CheckAssignment#on_lvasgn.
#on_gvasgn

Alias for CheckAssignment#on_lvasgn.
#on_ivasgn

Alias for CheckAssignment#on_lvasgn.
#on_lvasgn,
#on_masgn

Alias for CheckAssignment#on_lvasgn.
#on_op_asgn

Alias for CheckAssignment#on_lvasgn.
#on_or_asgn

Alias for CheckAssignment#on_lvasgn.
#on_send, #extract_rhs

::RuboCop::Cop::Base - Inherited

#add_global_offense

Adds an offense that has no particular location.
#add_offense

Adds an offense on the specified range (or node with an expression) Unless that offense is disabled for this range, a corrector will be yielded to provide the cop the opportunity to autocorrect the offense.
#begin_investigation

Called before any investigation.
#callbacks_needed,
#cop_config

Configuration Helpers.
#cop_name, #excluded_file?,
#external_dependency_checksum

This method should be overridden when a cop’s behavior depends on state that lives outside of these locations:
#inspect,
#message

Gets called if no message is specified when calling add_offense or add_global_offense Cops are discouraged to override this; instead pass your message directly.
#name

Alias for Base#cop_name.
#offenses,
#on_investigation_end

Called after all on_…​
#on_new_investigation

Called before all on_…​
#on_other_file

Called instead of all on_…​
#parse

There should be very limited reasons for a Cop to do it’s own parsing.
#parser_engine,
#ready

Called between investigations.
#relevant_file?,
#target_gem_version

Returns a gems locked versions (i.e.
#target_rails_version, #target_ruby_version, #annotate, #apply_correction, #attempt_correction,
#callback_argument

Reserved for Cop::Cop.
#complete_investigation

Called to complete an investigation.
#correct, #current_corrector,
#current_offense_locations

Reserved for Commissioner:
#current_offenses, #currently_disabled_lines, #custom_severity, #default_severity, #disable_uncorrectable, #enabled_line?, #file_name_matches_any?, #find_message, #find_severity, #range_for_original, #range_from_node_or_range,
#reset_investigation

Actually private methods.
#use_corrector

::RuboCop::Cop::AutocorrectLogic - Included

#disable_offense, #disable_offense_at_end_of_line, #disable_offense_before_and_after, #disable_offense_with_eol_or_surround_comment, #heredoc_range, #max_line_length, #multiline_ranges, #multiline_string?,
#range_by_lines

Expand the given range to include all of any lines it covers.
#range_of_first_line, #range_overlaps_offense?, #string_continuation?, #surrounding_heredoc?, #surrounding_percent_array?

::RuboCop::Cop::IgnoredNode - Included

#ignore_node, #ignored_node?, #part_of_ignored_node?, #ignored_nodes

Constructor Details

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

Instance Attribute Details

#single_line_block_chain_enabled? ⇒ Boolean (readonly, private)

[ GitHub ] 

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 117



def single_line_block_chain_enabled?
  @config.cop_enabled?('Layout/SingleLineBlockChain')
end


  







Instance Method Details



  

    #check_assignment(node, _rhs)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 74



def check_assignment(node, _rhs)
  return unless offense?(node)

  register_offense(node)
end


  








  

    #configured_to_not_be_inspected?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 104



def configured_to_not_be_inspected?(node)
  return true if other_cop_takes_precedence?(node)

  !cop_config['InspectBlocks'] && (node.block_type? ||
                                   any_descendant?(node, :block, &:multiline?))
end


  








  

    #convertible_block?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 121



def convertible_block?(node)
  parent = node.parent
  parent&.block_type? && node == parent.send_node &&
    (node.parenthesized? || !node.arguments?)
end


  








  

    #end_with_percent_blank_string?(processed_source)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 70



def end_with_percent_blank_string?(processed_source)
  processed_source.buffer.source.end_with?("%\n\n")
end


  








  

    #index_access_call_chained?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 98



def index_access_call_chained?(node)
  return false unless node.send_type? && node.method?(:[])

  node.children.first.send_type? && node.children.first.method?(:[])
end


  








  

    #offense?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 87



def offense?(node)
  return false unless node.multiline? && suitable_as_single_line?(node)
  return require_backslash?(node) if node.operator_keyword?

  !index_access_call_chained?(node) && !configured_to_not_be_inspected?(node)
end


  








  

    #on_csend(node)  
  



  

    


Alias for #on_send.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 66



alias on_csend on_send


  








  

    #on_lvasgn(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 52



def on_lvasgn(node)
  super unless end_with_percent_blank_string?(processed_source)
end


  








  

    #on_send(node)  
    Also known as: #on_csend
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 56



def on_send(node)
  # Include "the whole expression".
  node = node.parent while node.parent&.send_type? ||
                           convertible_block?(node) ||
                           node.parent.is_a?(RuboCop::AST::BinaryOperatorNode)

  return unless offense?(node) && !part_of_ignored_node?(node)

  register_offense(node)
end


  








  

    #other_cop_takes_precedence?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 111



def other_cop_takes_precedence?(node)
  single_line_block_chain_enabled? && any_descendant?(node, :block) do |block_node|
    block_node.parent.send_type? && block_node.parent.loc.dot && !block_node.multiline?
  end
end


  








  

    #register_offense(node)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 80



def register_offense(node)
  add_offense(node) do |corrector|
    corrector.replace(node, to_single_line(node.source).strip)
  end
  ignore_node(node)
end


  








  

    #require_backslash?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/redundant_line_break.rb', line 94



def require_backslash?(node)
  processed_source.lines[node.loc.operator.line - 1].end_with?('\\')
end