Class: RuboCop::Cop::Lint::LambdaWithoutLiteralBlock

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Defined in:
lib/rubocop/cop/lint/lambda_without_literal_block.rb

Overview

Checks uses of lambda without a literal block. It emulates the following warning in Ruby 3.0:

$ ruby -vwe 'lambda(&proc {})'
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19]
-e:1: warning: lambda without a literal block is deprecated; use the proc without
lambda instead

This way, proc object is never converted to lambda. Autocorrection replaces with compatible proc argument.

Examples:


# bad
lambda(&proc { do_something })
lambda(&Proc.new { do_something })

# good
proc { do_something }
Proc.new { do_something }
lambda { do_something } # If you use lambda.

Constant Summary collapse

MSG = 
'lambda without a literal block is deprecated; use the proc without lambda instead.'
RESTRICT_ON_SEND = 
%i[lambda].freeze

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

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, #string_literals_frozen_by_default?, 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

#lambda_with_symbol_proc?(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/lambda_without_literal_block.rb', line 35

def_node_matcher :lambda_with_symbol_proc?, <<~PATTERN
  (send nil? :lambda (block_pass (sym _)))
PATTERN

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/lambda_without_literal_block.rb', line 39

def on_send(node)
  if node.parent&.block_type? || !node.first_argument || lambda_with_symbol_proc?(node)
    return
  end

  add_offense(node) do |corrector|
    corrector.replace(node, node.first_argument.source.delete('&'))
  end
end