Class: RuboCop::Cop::Lint::MultipleComparison

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Defined in:
lib/rubocop/cop/lint/multiple_comparison.rb

Overview

In math and Python, we can use `x < y < z` style comparison to compare multiple value. However, we can't use the comparison in Ruby. However, the comparison is not syntax error. This cop checks the bad usage of comparison operators.

Examples:


# bad

x < y < z
10 <= x <= 20

# good

x < y && y < z
10 <= x && x <= 20

Constant Summary collapse

MSG = 
'Use the `&&` operator to compare multiple values.'
COMPARISON_METHODS = 
%i[< > <= >=].freeze
RESTRICT_ON_SEND = 
COMPARISON_METHODS

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods inherited from Base

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from AutocorrectLogic

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

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

add_parentheses, args_begin, args_end, begins_its_line?, comment_line?, comment_lines?, 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, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, hidden_dir?, hidden_file?, hidden_file_in_not_hidden_dir?, match_path?, maybe_hidden_file?, relative_path, smart_path

Constructor Details

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

Instance Method Details

#on_send(node) ⇒ Object 


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# File 'lib/rubocop/cop/lint/multiple_comparison.rb', line 35

def on_send(node)
  return unless (center = multiple_compare?(node))

  add_offense(node) do |corrector|
    new_center = "#{center.source} && #{center.source}"

    corrector.replace(center, new_center)
  end
end