Class: RuboCop::Cop::Lint::LiteralAsCondition

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

Overview

This cop checks for literals used as the conditions or as operands in and/or expressions serving as the conditions of if/while/until.

Examples:


# bad

if 20
  do_something
end

# bad

if some_var && true
  do_something
end

# good

if some_var && some_condition
  do_something
end

Constant Summary collapse

MSG = 
'Literal `%<literal>s` appeared as a condition.'.freeze

Constants included from Util

Util::ASGN_NODES, Util::CONDITIONAL_NODES, Util::EQUALS_ASGN_NODES, Util::LITERAL_REGEX, Util::LOGICAL_OPERATOR_NODES, Util::MODIFIER_NODES, Util::OPERATOR_METHODS, 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_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, #correct, department, #duplicate_location?, #excluded_file?, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #messages, non_rails, #parse, qualified_cop_name, #relevant_file?, #target_rails_version, #target_ruby_version

Methods included from AST::Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, comment_line?, double_quotes_required?, escape_string, first_part_of_call_chain, interpret_string_escapes, line_range, needs_escaping?, on_node, operator?, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens

Methods included from PathUtil

absolute?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#message(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/literal_as_condition.rb', line 73

def message(node)
  format(MSG, literal: node.source)
end

#on_case(case_node) ⇒ Object 



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

def on_case(case_node)
  if case_node.condition
    check_case(case_node)
  else
    case_node.each_when do |when_node|
      next unless when_node.conditions.all?(&:literal?)

      add_offense(when_node)
    end
  end
end

#on_if(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/literal_as_condition.rb', line 36

def on_if(node)
  check_for_literal(node)
end

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/literal_as_condition.rb', line 68

def on_send(node)
  return unless node.negation_method?
  check_for_literal(node)
end

#on_until(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/literal_as_condition.rb', line 48

def on_until(node)
  check_for_literal(node)
end

#on_until_post(node) ⇒ Object 



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

def on_until_post(node)
  check_for_literal(node)
end

#on_while(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/literal_as_condition.rb', line 40

def on_while(node)
  check_for_literal(node)
end

#on_while_post(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/literal_as_condition.rb', line 44

def on_while_post(node)
  check_for_literal(node)
end