Class: RuboCop::Cop::Style::EmptyLambdaParameter

Inherits:
Cop
  • Object
show all
Includes:
EmptyParameter, RangeHelp
Defined in:
lib/rubocop/cop/style/empty_lambda_parameter.rb

Overview

This cop checks for parentheses for empty lambda parameters. Parentheses for empty lambda parameters do not cause syntax errors, but they are redundant.

Examples:

# bad
-> () { do_something }

# good
-> { do_something }

# good
-> (arg) { do_something(arg) }

Constant Summary collapse

MSG = 
'Omit parentheses for the empty lambda parameters.'

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first

Methods inherited from Cop

#add_offense, all, autocorrect_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, #correct, department, #disable_uncorrectable, #duplicate_location?, #excluded_file?, #external_dependency_checksum, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #message, #messages, #parse, qualified_cop_name, #reason_to_not_correct, #relevant_file?, #target_rails_version, #target_ruby_version

Methods included from AST::Sexp

#s

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #correctable?, #disable_offense, #disable_uncorrectable?, #safe_autocorrect?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, comment_line?, double_quotes_required?, escape_string, first_part_of_call_chain, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, chdir, hidden_dir?, hidden_file_in_not_hidden_dir?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#autocorrect(node) ⇒ Object 



32
33
34
35
36
37
38
39
40
41
 
# File 'lib/rubocop/cop/style/empty_lambda_parameter.rb', line 32

def autocorrect(node)
  lambda do |corrector|
    send_node = node.parent.send_node
    range = range_between(
      send_node.loc.expression.end_pos,
      node.loc.expression.end_pos
    )
    corrector.remove(range)
  end
end

#on_block(node) ⇒ Object 



25
26
27
28
29
30
 
# File 'lib/rubocop/cop/style/empty_lambda_parameter.rb', line 25

def on_block(node)
  send_node = node.send_node
  return unless send_node.send_type?

  check(node) if node.send_node.lambda_literal?
end