Class: RuboCop::Cop::Lint::ShadowedArgument

Inherits:
Base
  • Object
show all
Defined in:
lib/rubocop/cop/lint/shadowed_argument.rb

Overview

Checks for shadowed arguments.

This cop has ‘IgnoreImplicitReferences` configuration option. It means argument shadowing is used in order to pass parameters to zero arity `super` when `IgnoreImplicitReferences` is `true`.

Examples:


# bad
do_something do |foo|
  foo = 42
  puts foo
end

def do_something(foo)
  foo = 42
  puts foo
end

# good
do_something do |foo|
  foo = foo + 42
  puts foo
end

def do_something(foo)
  foo = foo + 42
  puts foo
end

def do_something(foo)
  puts foo
end

IgnoreImplicitReferences: false (default)


# bad
def do_something(foo)
  foo = 42
  super
end

def do_something(foo)
  foo = super
  bar
end

IgnoreImplicitReferences: true


# good
def do_something(foo)
  foo = 42
  super
end

def do_something(foo)
  foo = super
  bar
end

Constant Summary collapse

MSG = 
'Argument `%<argument>s` was shadowed by a local variable before it was used.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Class Method Summary collapse

Instance Method Summary collapse

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, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #parser_engine, #ready, #relevant_file?, requires_gem, 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

Class Method Details

.joining_forces ⇒ Object 



72
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74
 
# File 'lib/rubocop/cop/lint/shadowed_argument.rb', line 72

def self.joining_forces
  VariableForce
end

Instance Method Details

#after_leaving_scope(scope, _variable_table) ⇒ Object 



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# File 'lib/rubocop/cop/lint/shadowed_argument.rb', line 76

def after_leaving_scope(scope, _variable_table)
  scope.variables.each_value { |variable| check_argument(variable) }
end

#uses_var?(node) ⇒ Object 



70
 
# File 'lib/rubocop/cop/lint/shadowed_argument.rb', line 70

def_node_search :uses_var?, '(lvar %)'