Class: RuboCop::Cop::Lint::Void

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/lint/void.rb

Overview

This cop checks for operators, variables and literals used in void context.

Constant Summary collapse

OP_MSG =
'Operator `%s` used in void context.'
VAR_MSG =
'Variable `%s` used in void context.'
LIT_MSG =
'Literal `%s` used in void context.'
OPS =
%w(* / % + - == === != < > <= >= <=>)
VARS =
[:ivar, :lvar, :cvar, :const]
LITERALS =
[:str, :dstr, :int, :float, :array,
:hash, :regexp, :nil, :true, :false]

Constants included from Util

Util::ASGN_NODES, Util::EQUALS_ASGN_NODES, Util::OPERATOR_METHODS, Util::PROC_NEW_NODE, Util::SHORTHAND_ASGN_NODES

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offense, all, #autocorrect?, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, cop_name_with_namespace, cop_type, #debug?, #display_cop_names?, inherited, #initialize, #join_force?, lint?, #message, non_rails, qualified_cop_name, rails?, #relevant_file?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, block_length, command?, comment_line?, const_name, first_part_of_call_chain, lambda?, lambda_or_proc?, line_range, numeric_range_size, on_node, operator?, parentheses?, proc?, range_with_surrounding_space, source_range, strip_quotes, within_node?

Methods included from PathUtil

issue_deprecation_warning, match_path?, relative_path

Constructor Details

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

Instance Method Details

#on_begin(node) ⇒ Object


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# File 'lib/rubocop/cop/lint/void.rb', line 18

def on_begin(node)
  expressions = *node

  expressions.drop_last(1).each do |expr|
    check_for_void_op(expr)
    check_for_literal(expr)
    check_for_var(expr)
  end
end