Class: RuboCop::Cop::Style::YodaCondition

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Includes:
ConfigurableEnforcedStyle, RangeHelp
Defined in:
lib/rubocop/cop/style/yoda_condition.rb

Overview

This cop can either enforce or forbid Yoda conditions, i.e. comparison operations where the order of expression is reversed. eg. `5 == x`

Examples:

EnforcedStyle: forbid_for_all_comparison_operators (default)

# bad
99 == foo
"bar" != foo
42 >= foo
10 < bar

# good
foo == 99
foo == "bar"
foo <= 42
bar > 10
"#{interpolation}" == foo
/#{interpolation}/ == foo

EnforcedStyle: forbid_for_equality_operators_only

# bad
99 == foo
"bar" != foo

# good
99 >= foo
3 < a && a < 5

EnforcedStyle: require_for_all_comparison_operators

# bad
foo == 99
foo == "bar"
foo <= 42
bar > 10

# good
99 == foo
"bar" != foo
42 >= foo
10 < bar

EnforcedStyle: require_for_equality_operators_only

# bad
99 >= foo
3 < a && a < 5

# good
99 == foo
"bar" != foo

Constant Summary collapse

MSG =
'Reverse the order of the operands `%<source>s`.'
REVERSE_COMPARISON =
{
  '<' => '>',
  '<=' => '>=',
  '>' => '<',
  '>=' => '<='
}.freeze
EQUALITY_OPERATORS =
%i[== !=].freeze
NONCOMMUTATIVE_OPERATORS =
%i[===].freeze
PROGRAM_NAMES =
%i[$0 $PROGRAM_NAME].freeze

Constants inherited from Base

Base::RESTRICT_ON_SEND

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 included from ConfigurableEnforcedStyle

#alternative_style, #alternative_styles, #ambiguous_style_detected, #correct_style_detected, #detected_style, #detected_style=, #no_acceptable_style!, #no_acceptable_style?, #opposite_style_detected, #style, #style_configured?, #style_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected

Methods inherited from Base

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #callbacks_needed, callbacks_needed, #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?, #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, indent, 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/style/yoda_condition.rb', line 79

def on_send(node)
  return unless yoda_compatible_condition?(node)
  return if equality_only? && non_equality_operator?(node) ||
            file_constant_equal_program_name?(node)

  valid_yoda?(node) || add_offense(node) do |corrector|
    corrector.replace(actual_code_range(node), corrected_code(node))
  end
end