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")
var1 = ...
var2 = ...
str.end_with?(var1) || str.end_with?(var2)

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

Constant Summary collapse

MSG = 
'Use `%{receiver}.%{method}(%{combined_args})` ' \
'instead of `%{original_code}`.'.freeze

Constants included from Util

Util::ASGN_NODES, Util::BYTE_ORDER_MARK, Util::EQUALS_ASGN_NODES, Util::LITERAL_REGEX, Util::OPERATOR_METHODS, Util::SHORTHAND_ASGN_NODES, Util::STRING_ESCAPES, Util::STRING_ESCAPE_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offense, all, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, cop_type, #correct, #debug?, #details, #display_cop_names?, #display_style_guide?, #excluded_file?, #extra_details?, inherited, #initialize, #join_force?, lint?, match?, #message, non_rails, #parse, qualified_cop_name, #reference_url, #relevant_file?, #style_guide_url, #target_ruby_version

Methods included from Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search_body

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?, block_length, comment_line?, directions, double_quotes_acceptable?, double_quotes_required?, effective_column, ends_its_line?, first_part_of_call_chain, interpret_string_escapes, line_range, move_pos, numeric_range_size, on_node, operator?, parentheses?, range_with_surrounding_comma, range_with_surrounding_space, source_range, strip_quotes, to_string_literal, to_symbol_literal, within_node?

Methods included from PathUtil

absolute?, hidden?, issue_deprecation_warning, match_path?, relative_path

Constructor Details

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

Instance Method Details

#on_or(node) ⇒ Object 



30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
 
# File 'lib/rubocop/cop/performance/double_start_end_with.rb', line 30

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

  if receiver && second_call_args.all?(&:pure?)
    add_offense(
      node,
      :expression,
      format(
        MSG,
        receiver: receiver.source,
        method: method,
        combined_args: combine_args(first_call_args, second_call_args),
        original_code: node.source
      )
    )
  end
end