Class: RuboCop::Cop::Style::SymbolProc

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

Overview

Use symbols as procs when possible.

Examples:

# bad
something.map { |s| s.upcase }

# good
something.map(&:upcase)

Constant Summary collapse

MSG = 
'Pass `&:%<method>s` as an argument to `%<block_method>s` ' \
'instead of a block.'.freeze
SUPER_TYPES = 
%i[super zsuper].freeze

Constants included from Util

Util::ASGN_NODES, Util::CONDITIONAL_NODES, Util::EQUALS_ASGN_NODES, Util::LITERAL_REGEX, Util::LOGICAL_OPERATOR_NODES, Util::MODIFIER_NODES, Util::OPERATOR_METHODS, Util::SHORTHAND_ASGN_NODES

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Cop

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

Methods included from AST::Sexp

#s

Methods included from NodePattern::Macros

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

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #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, operator?, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens

Methods included from PathUtil

absolute?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Class Method Details

.autocorrect_incompatible_with ⇒ Object 



29
30
31
 
# File 'lib/rubocop/cop/style/symbol_proc.rb', line 29

def self.autocorrect_incompatible_with
  [Layout::SpaceBeforeBlockBraces]
end

Instance Method Details

#autocorrect(node) ⇒ Object 



50
51
52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/rubocop/cop/style/symbol_proc.rb', line 50

def autocorrect(node)
  lambda do |corrector|
    block_send_or_super, _block_args, block_body = *node
    _receiver, method_name, _args = *block_body

    if super?(block_send_or_super)
      args = *block_send_or_super
    else
      _breceiver, _bmethod_name, *args = *block_send_or_super
    end
    autocorrect_method(corrector, node, args, method_name)
  end
end

#on_block(node) ⇒ Object 



33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/rubocop/cop/style/symbol_proc.rb', line 33

def on_block(node)
  symbol_proc?(node) do |send_or_super, block_args, method|
    block_method_name = resolve_block_method_name(send_or_super)

    # TODO: Rails-specific handling that we should probably make
    # configurable - https://github.com/rubocop-hq/rubocop/issues/1485
    # we should ignore lambdas & procs
    return if proc_node?(send_or_super)
    return if %i[lambda proc].include?(block_method_name)
    return if ignored_method?(block_method_name)
    return if block_args.children.size == 1 &&
              block_args.source.include?(',')

    offense(node, method, block_method_name)
  end
end