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

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector, TargetRubyVersion
Includes:
RangeHelp
Defined in:
lib/rubocop/cop/lint/erb_new_arguments.rb

Overview

Emulates the following Ruby warnings in Ruby 2.6.

source,console

$ 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 collapse

MESSAGES = 
[
  'Passing safe_level with the 2nd argument of `ERB.new` is ' \
  'deprecated. Do not use it, and specify other arguments as ' \
  'keyword arguments.',
  'Passing trim_mode with the 3rd argument of `ERB.new` is ' \
  'deprecated. Use keyword argument like ' \
  '`ERB.new(str, trim_mode: %<arg_value>s)` instead.',
  'Passing eoutvar with the 4th argument of `ERB.new` is ' \
  'deprecated. Use keyword argument like ' \
  '`ERB.new(str, eoutvar: %<arg_value>s)` instead.'
].freeze
RESTRICT_ON_SEND = 
%i[new].freeze

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods included from TargetRubyVersion

minimum_target_ruby_version, required_minimum_ruby_version, support_target_ruby_version?

Methods inherited from Base

#active_support_extensions_enabled?, #add_global_offense, #add_offense, #always_autocorrect?, autocorrect_incompatible_with, badge, #begin_investigation, callbacks_needed, #callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #cop_config, cop_name, #cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, #inspect, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #parser_engine, #ready, #relevant_file?, requires_gem, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

#exclude_limit

Methods included from AutocorrectLogic

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

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

silence_warnings

Constructor Details

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

Instance Method Details

#erb_new_with_non_keyword_arguments(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 83

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

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/erb_new_arguments.rb', line 88

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?

      message = format(MESSAGES[i], arg_value: argument.source)

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