Class: RuboCop::Cop::Performance::DoubleStartEndWith

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/performance/double_start_end_with.rb

Overview

This cop checks for double ‘#start_with?` or `#end_with?` calls separated by `||`. In some cases such calls can be replaced with an single `#start_with?`/`#end_with?` call.

Examples:

# bad
str.start_with?("a") || str.start_with?(Some::CONST)
str.start_with?("a", "b") || str.start_with?("c")
str.end_with?(var1) || str.end_with?(var2)

# good
str.start_with?("a", Some::CONST)
str.start_with?("a", "b", "c")
str.end_with?(var1, var2)

Constant Summary collapse

MSG = 
'Use `%<receiver>s.%<method>s(%<combined_args>s)` ' \
'instead of `%<original_code>s`.'.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

Instance Method Summary collapse

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, #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

Instance Method Details

#autocorrect(node) ⇒ Object 



37
38
39
40
41
42
43
44
45
46
47
48
49
 
# File 'lib/rubocop/cop/performance/double_start_end_with.rb', line 37

def autocorrect(node)
  _receiver, _method,
  first_call_args, second_call_args = process_source(node)

  combined_args = combine_args(first_call_args, second_call_args)
  first_argument = first_call_args.first.loc.expression
  last_argument = second_call_args.last.loc.expression
  range = first_argument.join(last_argument)

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

#on_or(node) ⇒ Object 



24
25
26
27
28
29
30
31
32
33
34
35
 
# File 'lib/rubocop/cop/performance/double_start_end_with.rb', line 24

def on_or(node)
  receiver,
  method,
  first_call_args,
  second_call_args = process_source(node)

  return unless receiver && second_call_args.all?(&:pure?)

  combined_args = combine_args(first_call_args, second_call_args)

  add_offense_for_double_call(node, receiver, method, combined_args)
end