Class: RuboCop::Cop::Style::GuardClause

Inherits:

Cop

• Object
• Cop
• RuboCop::Cop::Style::GuardClause

Includes:

MinBodyLength

Defined in:

lib/rubocop/cop/style/guard_clause.rb

Overview

Use a guard clause instead of wrapping the code inside a conditional expression

Examples:

# bad
def test
  if something
    work
  end
end

# good
def test
  return unless something
  work
end

# also good
def test
  work if something
end

# bad
if something
  raise 'exception'
else
  ok
end

# good
raise 'exception' if something
ok

Constant Summary

MSG =

'Use a guard clause instead of wrapping the code inside a ' \
'conditional expression.'

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary

• #on_def(node) ⇒ Object (also: #on_defs)
• #on_if(node) ⇒ Object

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?, #message, #messages, non_rails, #parse, qualified_cop_name, #relevant_file?, #target_rails_version, #target_ruby_version

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 AST::Sexp

#s

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, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, chdir, hidden_dir?, hidden_file_in_not_hidden_dir?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#on_def(node) ⇒ Object Also known as: on_defs

# File 'lib/rubocop/cop/style/guard_clause.rb', line 44

def on_def(node)
  body = node.body

  return unless body

  if body.if_type?
    check_ending_if(body)
  elsif body.begin_type? && body.children.last.if_type?
    check_ending_if(body.children.last)
  end
end

#on_if(node) ⇒ Object

# File 'lib/rubocop/cop/style/guard_clause.rb', line 57

def on_if(node)
  return if accepted_form?(node) || !contains_guard_clause?(node)

  add_offense(node, location: :keyword)
end