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Class: RuboCop::Cop::Style::OperatorMethodCall

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::Base, ::RuboCop::Cop::AutocorrectLogic, ::RuboCop::Cop::IgnoredNode, ::RuboCop::Util, RuboCop::AST::Sexp
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/style/operator_method_call.rb

Overview

Checks for redundant dot before operator method call. The target operator methods are {|}, ^, &, <⇒, ==, ===, =~, >, >=, <, ⇐, <<, >>, +, -, , /, %, *, ~, !, !=, and !~.

Examples:

# bad
foo.+ bar
foo.& bar

# good
foo + bar
foo & bar

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::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_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, #max_line_length,
#range_by_lines

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

#insert_space_after?(node) ⇒ Boolean (private)

[ GitHub ] 

  


# File 'lib/rubocop/cop/style/operator_method_call.rb', line 74



def insert_space_after?(node)
  rhs = node.first_argument
  selector = node.loc.selector

  return true if selector.end_pos == rhs.source_range.begin_pos
  return false if node.parent&.call_type? # if chained, a space is already added

  # For `/` operations, if the RHS starts with a `(` without space,
  # add one to avoid a syntax error.
  range = selector.end.join(rhs.source_range.begin)
  return true if node.method?(:/) && range.source == '('

  false
end


  








  

    #invalid_syntax_argument?(argument)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/operator_method_call.rb', line 57



def invalid_syntax_argument?(argument)
  type = argument.hash_type? ? argument.children.first&.type : argument.type

  INVALID_SYNTAX_ARG_TYPES.include?(type)
end


  








  

    #method_call_with_parenthesized_arg?(argument)  ⇒ Boolean  (private)
  



  

    


Checks for an acceptable case of foo.+(bar).baz.



  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/operator_method_call.rb', line 51



def method_call_with_parenthesized_arg?(argument)
  return false unless argument.parent.parent&.send_type?

  argument.children.first && argument.parent.parenthesized?
end


  








  

    #on_send(node)  
  



  

    


Metrics/CyclomaticComplexity



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/operator_method_call.rb', line 30



def on_send(node)
  return unless (dot = node.loc.dot)
  return if node.receiver.const_type? || !node.arguments.one?

  return unless (rhs = node.first_argument)
  return if method_call_with_parenthesized_arg?(rhs)
  return if invalid_syntax_argument?(rhs)

  add_offense(dot) do |corrector|
    wrap_in_parentheses_if_chained(corrector, node)
    corrector.replace(dot, ' ')

    selector = node.loc.selector
    corrector.insert_after(selector, ' ') if insert_space_after?(node)
  end
end


  








  

    #wrap_in_parentheses_if_chained(corrector, node)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/operator_method_call.rb', line 63



def wrap_in_parentheses_if_chained(corrector, node)
  return unless node.parent&.call_type?
  return if node.parent.first_argument == node

  operator = node.loc.selector

  ParenthesesCorrector.correct(corrector, node)
  corrector.insert_after(operator, ' ')
  corrector.wrap(node, '(', ')')
end