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Class: RuboCop::Cop::Lint::LiteralAssignmentInCondition

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::RuboCop::Cop::Base, ::RuboCop::ExcludeLimit, NodePattern::Macros, RuboCop::AST::Sexp
Instance Chain:
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/lint/literal_assignment_in_condition.rb

Overview

Checks for literal assignments in the conditions of if, while, and until. It emulates the following Ruby warning:

$ ruby -we 'if x = true; end'
-e:1: warning: found `= literal' in conditional, should be ==

As a lint cop, it cannot be determined if == is appropriate as intended, therefore this cop does not provide autocorrection.

Examples:

# bad
if x = 42
  do_something
end

# good
if x == 42
  do_something
end

# good
if x = y
  do_something
end

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

Class Attribute Summary

::RuboCop::Cop::Base - Inherited

.gem_requirements, .lint?,
.support_autocorrect?

Returns if class supports autocorrect.

.support_multiple_source?

Override if your cop should be called repeatedly for multiple investigations Between calls to on_new_investigation and on_investigation_end, the result of processed_source will remain constant.

Class Method Summary

::RuboCop::Cop::Base - Inherited

.autocorrect_incompatible_with

List of cops that should not try to autocorrect at the same time as this cop.

.badge

Naming.

.callbacks_needed, .cop_name, .department,
.documentation_url

Returns an url to view this cops documentation online.

.exclude_from_registry

Call for abstract Cop classes.

.inherited,
.joining_forces

Override and return the Force class(es) you need to join.

.match?

Returns true if the cop name or the cop namespace matches any of the given names.

.new,
.requires_gem

Register a version requirement for the given gem name.

.restrict_on_send

::RuboCop::ExcludeLimit - Extended

exclude_limit

Sets up a configuration option to have an exclude limit tracked.

transform

Instance Attribute Summary

Instance Method Summary

::RuboCop::Cop::Base - Inherited

#add_global_offense

Adds an offense that has no particular location.

#add_offense

Adds an offense on the specified range (or node with an expression) Unless that offense is disabled for this range, a corrector will be yielded to provide the cop the opportunity to autocorrect the offense.

#begin_investigation

Called before any investigation.

#callbacks_needed,
#cop_config

Configuration Helpers.

#cop_name, #excluded_file?,
#external_dependency_checksum

This method should be overridden when a cop’s behavior depends on state that lives outside of these locations:

#inspect
#message

Gets called if no message is specified when calling add_offense or add_global_offense Cops are discouraged to override this; instead pass your message directly.

#name

Alias for Base#cop_name.

#offenses,
#on_investigation_end

Called after all on_…​

#on_new_investigation

Called before all on_…​

#on_other_file

Called instead of all on_…​

#parse

There should be very limited reasons for a Cop to do it’s own parsing.

#parser_engine,
#ready

Called between investigations.

#relevant_file?, #target_rails_version, #target_ruby_version, #annotate, #apply_correction, #attempt_correction,
#callback_argument

Reserved for Cop::Cop.

#complete_investigation

Called to complete an investigation.

#correct, #current_corrector,
#current_offense_locations

Reserved for Commissioner:

#current_offenses, #currently_disabled_lines, #custom_severity, #default_severity, #disable_uncorrectable, #enabled_line?, #file_name_matches_any?, #find_message, #find_severity, #range_for_original, #range_from_node_or_range,
#reset_investigation

Actually private methods.

#use_corrector

::RuboCop::Cop::AutocorrectLogic - Included

::RuboCop::Cop::IgnoredNode - Included

Constructor Details

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

Instance Method Details

#all_literals?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/literal_assignment_in_condition.rb', line 62

def all_literals?(node)
  case node.type
  when :dstr, :xstr
    false
  when :array
    node.values.all? { |value| all_literals?(value) }
  when :hash
    (node.values + node.keys).all? { |item| all_literals?(item) }
  else
    node.respond_to?(:literal?) && node.literal?
  end
end

#offense_range(asgn_node, rhs) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/literal_assignment_in_condition.rb', line 79

def offense_range(asgn_node, rhs)
  asgn_node.loc.operator.join(rhs.source_range.end)
end

#on_if(node) Also known as: #on_while, #on_until

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/literal_assignment_in_condition.rb', line 39

def on_if(node)
  traverse_node(node.condition) do |asgn_node|
    next unless asgn_node.loc.operator

    rhs = asgn_node.to_a.last
    next if !all_literals?(rhs) || parallel_assignment_with_splat_operator?(rhs)

    range = offense_range(asgn_node, rhs)

    add_offense(range, message: format(MSG, literal: rhs.source))
  end
end

#on_until(node)

Alias for #on_if.

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/literal_assignment_in_condition.rb', line 52

alias on_until on_if

#on_while(node)

Alias for #on_if.

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/literal_assignment_in_condition.rb', line 51

alias on_while on_if

#parallel_assignment_with_splat_operator?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/lint/literal_assignment_in_condition.rb', line 75

def parallel_assignment_with_splat_operator?(node)
  node.array_type? && node.values.first&.splat_type?
end

#traverse_node(node) {|node| ... } (private)

Yields:

  • (node)
[ GitHub ]

  
# File 'lib/rubocop/cop/lint/literal_assignment_in_condition.rb', line 56

def traverse_node(node, &block)
  yield node if node.equals_asgn?

  node.each_child_node { |child| traverse_node(child, &block) }
end