Class: RuboCop::Cop::Style::ConditionalAssignment

Inherits:

Base

Object
Base
RuboCop::Cop::Style::ConditionalAssignment

show all

Extended by:: AutoCorrector

Includes:: ConfigurableEnforcedStyle, IgnoredNode, ConditionalAssignmentHelper

Defined in:: lib/rubocop/cop/style/conditional_assignment.rb

Overview

Check for ‘if` and `case` statements where each branch is used for assignment to the same variable when using the return of the condition can be used instead.

Examples:

EnforcedStyle: assign_to_condition (default)

# bad
if foo
  bar = 1
else
  bar = 2
end

case foo
when 'a'
  bar += 1
else
  bar += 2
end

if foo
  some_method
  bar = 1
else
  some_other_method
  bar = 2
end

# good
bar = if foo
        1
      else
        2
      end

bar += case foo
       when 'a'
         1
       else
         2
       end

bar << if foo
         some_method
         1
       else
         some_other_method
         2
       end

EnforcedStyle: assign_inside_condition

# bad
bar = if foo
        1
      else
        2
      end

bar += case foo
       when 'a'
         1
       else
         2
       end

bar << if foo
         some_method
         1
       else
         some_other_method
         2
       end

# good
if foo
  bar = 1
else
  bar = 2
end

case foo
when 'a'
  bar += 1
else
  bar += 2
end

if foo
  some_method
  bar = 1
else
  some_other_method
  bar = 2
end

Constant Summary collapse

MSG =

'Use the return of the conditional for variable assignment ' \
'and comparison.'

ASSIGN_TO_CONDITION_MSG =

'Assign variables inside of conditionals'

VARIABLE_ASSIGNMENT_TYPES =

%i[casgn cvasgn gvasgn ivasgn lvasgn].freeze

ASSIGNMENT_TYPES =

VARIABLE_ASSIGNMENT_TYPES +
%i[and_asgn or_asgn op_asgn masgn].freeze

LINE_LENGTH =

'Layout/LineLength'

INDENTATION_WIDTH =

'Layout/IndentationWidth'

ENABLED =

'Enabled'

MAX =

'Max'

SINGLE_LINE_CONDITIONS_ONLY =

'SingleLineConditionsOnly'

WIDTH =

'Width'

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

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 included from ConditionalAssignmentHelper

#end_with_eq?, #expand_elses, #expand_when_branches, #indent, #lhs, #tail

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?, #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 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_case(node) ⇒ `Object`

# File 'lib/rubocop/cop/style/conditional_assignment.rb', line 269

def on_case(node)
  return unless style == :assign_to_condition
  return unless node.else_branch

  when_branches = expand_when_branches(node.when_branches)
  branches = [*when_branches, node.else_branch]

  check_node(node, branches)
end

#on_if(node) ⇒ `Object`

# File 'lib/rubocop/cop/style/conditional_assignment.rb', line 255

def on_if(node)
  return unless style == :assign_to_condition
  return if node.elsif?

  else_branch = node.else_branch
  elsif_branches, else_branch = expand_elses(else_branch)

  return unless else_branch

  branches = [node.if_branch, *elsif_branches, else_branch]

  check_node(node, branches)
end

#on_send(node) ⇒ `Object`

# File 'lib/rubocop/cop/style/conditional_assignment.rb', line 249

def on_send(node)
  return unless assignment_type?(node)

  check_assignment_to_condition(node)
end