Class: RuboCop::Cop::Lint::UnneededSplatExpansion

Inherits:

Cop

• Object
• Cop
• RuboCop::Cop::Lint::UnneededSplatExpansion

Defined in:

lib/rubocop/cop/lint/unneeded_splat_expansion.rb

Overview

This cop checks for unneeded usages of splat expansion

Examples:

# bad

a = *[1, 2, 3]
a = *'a'
a = *1

begin
  foo
rescue *[StandardError, ApplicationError]
  bar
end

case foo
when *[1, 2, 3]
  bar
else
  baz
end

# good

c = [1, 2, 3]
a = *c
a, b = *c
a, *b = *c
a = *1..10
a = ['a']

begin
  foo
rescue StandardError, ApplicationError
  bar
end

case foo
when 1, 2, 3
  bar
else
  baz
end

Constant Summary

MSG =

'Replace splat expansion with comma separated values.'

ARRAY_PARAM_MSG =

'Pass array contents as separate arguments.'

PERCENT_W =

'%w'

PERCENT_CAPITAL_W =

'%W'

PERCENT_I =

'%i'

PERCENT_CAPITAL_I =

'%I'

ASSIGNMENT_TYPES =

%i[lvasgn ivasgn cvasgn gvasgn].freeze

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary

• #autocorrect(node) ⇒ Object
• #on_splat(node) ⇒ Object

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?, #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 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?, #correctable?, #disable_offense, #disable_uncorrectable?, #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

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

def autocorrect(node)
  range, content = replacement_range_and_content(node)

  lambda do |corrector|
    corrector.replace(range, content)
  end
end

#on_splat(node) ⇒ Object

# File 'lib/rubocop/cop/lint/unneeded_splat_expansion.rb', line 72

def on_splat(node)
  unneeded_splat_expansion(node) do
    if array_splat?(node) &&
       (method_argument?(node) || part_of_an_array?(node))
      add_offense(node, message: ARRAY_PARAM_MSG)
    else
      add_offense(node)
    end
  end
end