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Class: RuboCop::Cop::Lint::ErbNewArguments

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

Overview

Emulates the following Ruby warnings in Ruby 2.6.

$ cat example.rb
ERB.new('hi', nil, '-', '@output_buffer')
$ ruby -rerb example.rb
example.rb:1: warning: Passing safe_level with the 2nd argument of ERB.new is
deprecated. Do not use it, and specify other arguments as keyword arguments.
example.rb:1: warning: Passing trim_mode with the 3rd argument of ERB.new is
deprecated. Use keyword argument like ERB.new(str, trim_mode:...) instead.
example.rb:1: warning: Passing eoutvar with the 4th argument of ERB.new is
deprecated. Use keyword argument like ERB.new(str, eoutvar: ...) instead.

Now non-keyword arguments other than first one are softly deprecated and will be removed when Ruby 2.5 becomes EOL. ERB.new with non-keyword arguments is deprecated since ERB 2.2.0. Use :trim_mode and :eoutvar keyword arguments to ERB.new. This cop identifies places where ERB.new(str, trim_mode, eoutvar) can be replaced by ERB.new(str, :trim_mode: trim_mode, eoutvar: eoutvar).

Examples:

# Target codes supports Ruby 2.6 and higher only
# bad
ERB.new(str, nil, '-', '@output_buffer')

# good
ERB.new(str, trim_mode: '-', eoutvar: '@output_buffer')

# Target codes supports Ruby 2.5 and lower only
# good
ERB.new(str, nil, '-', '@output_buffer')

# Target codes supports Ruby 2.6, 2.5 and lower
# bad
ERB.new(str, nil, '-', '@output_buffer')

# good
# Ruby standard library style
# https://github.com/ruby/ruby/commit/3406c5d
if ERB.instance_method(:initialize).parameters.assoc(:key) # Ruby 2.6+
  ERB.new(str, trim_mode: '-', eoutvar: '@output_buffer')
else
  ERB.new(str, nil, '-', '@output_buffer')
end

# good
# Use {RUBY_VERSION} style
if RUBY_VERSION >= '2.6'
  ERB.new(str, trim_mode: '-', eoutvar: '@output_buffer')
else
  ERB.new(str, nil, '-', '@output_buffer')
end

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

::RuboCop::Cop::RangeHelp - Included

BYTE_ORDER_MARK, NOT_GIVEN

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::TargetRubyVersion - Extended

minimum_target_ruby_version, required_minimum_ruby_version, support_target_ruby_version?

::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::RangeHelp - Included

#add_range, #column_offset_between,
#contents_range

A range containing only the contents of a literal with delimiters (e.g.
#directions,
#effective_column

Returns the column attribute of the range, except if the range is on the first line and there’s a byte order mark at the beginning of that line, in which case 1 is subtracted from the column value.
#final_pos, #move_pos, #move_pos_str, #range_between, #range_by_whole_lines, #range_with_comments, #range_with_comments_and_lines, #range_with_surrounding_comma, #range_with_surrounding_space, #source_range

::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

#arguments_range(node) (private)

[ GitHub ] 

  


# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 160



def arguments_range(node)
  arguments = node.arguments

  range_between(arguments.first.source_range.begin_pos, arguments.last.source_range.end_pos)
end


  








  

    #autocorrect(corrector, node)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 115



def autocorrect(corrector, node)
  str_arg = node.first_argument.source

  kwargs = build_kwargs(node)
  overridden_kwargs = override_by_legacy_args(kwargs, node)

  good_arguments = [str_arg, overridden_kwargs].flatten.compact.join(', ')

  corrector.replace(arguments_range(node), good_arguments)
end


  








  

    #build_kwargs(node)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 130



def build_kwargs(node)
  return [nil, nil] unless node.last_argument.hash_type?

  trim_mode_arg, eoutvar_arg = nil

  node.last_argument.pairs.each do |pair|
    case pair.key.source
    when 'trim_mode'
      trim_mode_arg = "trim_mode: #{pair.value.source}"
    when 'eoutvar'
      eoutvar_arg = "eoutvar: #{pair.value.source}"
    end
  end

  [trim_mode_arg, eoutvar_arg]
end


  








  

    #correct_arguments?(arguments)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 126



def correct_arguments?(arguments)
  arguments.size == 1 || (arguments.size == 2 && arguments[1].hash_type?)
end


  








  

    #erb_new_with_non_keyword_arguments(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 81



def_node_matcher :erb_new_with_non_keyword_arguments, <<~PATTERN
  (send
    (const {nil? cbase} :ERB) :new $...)
PATTERN


  








  

    #message(positional_argument_index, arg_value)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 104



def message(positional_argument_index, arg_value)
  case positional_argument_index
  when 0
    MESSAGE_SAFE_LEVEL
  when 1
    format(MESSAGE_TRIM_MODE, arg_value: arg_value)
  when 2
    format(MESSAGE_EOUTVAR, arg_value: arg_value)
  end
end


  








  

    #on_send(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 86



def on_send(node)
  erb_new_with_non_keyword_arguments(node) do |arguments|
    return if arguments.empty? || correct_arguments?(arguments)

    arguments[1..3].each_with_index do |argument, i|
      next if !argument || argument.hash_type?

      add_offense(
        argument, message: message(i, argument.source)
      ) do |corrector|
        autocorrect(corrector, node)
      end
    end
  end
end


  








  

    #override_by_legacy_args(kwargs, node)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 147



def override_by_legacy_args(kwargs, node)
  arguments = node.arguments
  overridden_kwargs = kwargs.dup

  overridden_kwargs[0] = "trim_mode: #{arguments[2].source}" if arguments[2]

  if arguments[3] && !arguments[3].hash_type?
    overridden_kwargs[1] = "eoutvar: #{arguments[3].source}"
  end

  overridden_kwargs
end