class RuboCop::Cop::Style::MissingElse

Checks for `if` expressions that do not have an `else` branch. SupportedStyles

if @example

# bad
if condition
  statement
end

case @example

# bad
case var
when condition
  statement
end

@example

# good
if condition
  statement
else
# the content of the else branch will be determined by Style/EmptyElse
end

Constants

MSG
MSG_EMPTY
MSG_NIL

Public Instance Methods

on_case(node) click to toggle source
# File lib/rubocop/cop/style/missing_else.rb, line 49
def on_case(node)
  check(node, case_else_clause(node)) unless style == :if
end
on_normal_if_unless(node) click to toggle source
# File lib/rubocop/cop/style/missing_else.rb, line 40
def on_normal_if_unless(node)
  unless_else_cop = config.for_cop('Style/UnlessElse')
  unless_else_enabled = unless_else_cop['Enabled'] if unless_else_cop
  return if unless_else_enabled &&
            node.loc.keyword &&
            node.loc.keyword.is?('unless')
  check(node, if_else_clause(node)) unless style == :case
end

Private Instance Methods

check(node, _else_clause) click to toggle source
# File lib/rubocop/cop/style/missing_else.rb, line 55
def check(node, _else_clause)
  return if node.loc.else
  empty_else = config.for_cop('Style/EmptyElse')

  if empty_else && empty_else['Enabled']
    case empty_else['EnforcedStyle']
    when 'empty'
      add_offense(node, :expression, format(MSG_NIL, node.type))
    when 'nil'
      add_offense(node, :expression, format(MSG_EMPTY, node.type))
    end
  end

  add_offense(node, :expression, format(MSG, node.type))
end