Class: RuboCop::Cop::Style::ParallelAssignment

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Includes:
RescueNode
Defined in:
lib/rubocop/cop/style/parallel_assignment.rb

Overview

Checks for simple usages of parallel assignment. This will only complain when the number of variables being assigned matched the number of assigning variables.

Examples:

# bad
a, b, c = 1, 2, 3
a, b, c = [1, 2, 3]

# good
one, two = *foo
a, b = foo()
a, b = b, a

a = 1
b = 2
c = 3

Defined Under Namespace

Classes: AssignmentSorter, GenericCorrector, ModifierCorrector, RescueCorrector

Constant Summary collapse

MSG = 
'Do not use parallel assignment.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods included from RescueNode

#modifier_locations

Methods inherited from Base

#active_support_extensions_enabled?, #add_global_offense, #add_offense, #always_autocorrect?, autocorrect_incompatible_with, badge, #begin_investigation, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #cop_config, cop_name, #cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, #inspect, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #parser_engine, #ready, #relevant_file?, requires_gem, #string_literals_frozen_by_default?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

#exclude_limit

Methods included from AutocorrectLogic

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

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

silence_warnings

Constructor Details

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

Instance Method Details

#on_masgn(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 31

def on_masgn(node)
  lhs, rhs = *node
  lhs_elements = *lhs
  rhs = rhs.body if rhs.rescue_type?
  rhs_elements = Array(rhs).compact # edge case for one constant

  return if allowed_lhs?(lhs) || allowed_rhs?(rhs) ||
            allowed_masign?(lhs_elements, rhs_elements)

  range = node.source_range.begin.join(rhs.source_range.end)

  add_offense(range) do |corrector|
    autocorrect(corrector, node, lhs, rhs)
  end
end