class RuboCop::Cop::Style::EmptyLiteral

s = ”
h = {}
a = []
# good
s = String.new
h = Hash.new
a = Array.new
# bad
@example
would be a literal, like an empty array, hash or string.
This cop checks for the use of a method, the result of which

def autocorrect(node) 

def autocorrect(node)
  lambda do |corrector|
    corrector.replace(replacement_range(node), correction(node))
  end
end

def correction(node) 

def correction(node)
  if offense_array_node?(node)
    '[]'
  elsif str_node(node)
    preferred_string_literal
  elsif offense_hash_node?(node)
    if first_argument_unparenthesized?(node)
      # `some_method {}` is not same as `some_method Hash.new`
      # because the braces are interpreted as a block. We will have
      # to rewrite the arguments to wrap them in parenthesis.
      _receiver, _method_name, *args = *node.parent
      "(#{args[1..-1].map(&:source).unshift('{}').join(', ')})"
    else
      '{}'
    end
  end
end

def enforce_double_quotes? 

def enforce_double_quotes?
  string_literals_config['EnforcedStyle'] == 'double_quotes'
end

def first_argument_unparenthesized?(node) 

def first_argument_unparenthesized?(node)
  return false unless node.parent && node.parent.send_type?
  _receiver, _method_name, *args = *node.parent
  node.object_id == args.first.object_id && !parentheses?(node.parent)
end

def offense_array_node?(node) 

def offense_array_node?(node)
  array_node(node) && !array_with_block(node.parent)
end

def offense_hash_node?(node) 

def offense_hash_node?(node)
  # If Hash.new takes a block, it can't be changed to {}.
  hash_node(node) && !hash_with_block(node.parent)
end

def on_send(node) 

def on_send(node)
  add_offense(node, message: ARR_MSG)  if offense_array_node?(node)
  add_offense(node, message: HASH_MSG) if offense_hash_node?(node)
  str_node(node) do
    return if frozen_string_literals_enabled?
    add_offense(node,
                message: format(STR_MSG,
                                prefer: preferred_string_literal))
  end
end

def preferred_string_literal 

def preferred_string_literal
  enforce_double_quotes? ? '""' : "''"
end

def replacement_range(node) 

def replacement_range(node)
  if hash_node(node) &&
     first_argument_unparenthesized?(node)
    # `some_method {}` is not same as `some_method Hash.new`
    # because the braces are interpreted as a block. We will have
    # to rewrite the arguments to wrap them in parenthesis.
    _receiver, _method_name, *args = *node.parent
    range_between(args[0].loc.expression.begin_pos - 1,
                  args[-1].loc.expression.end_pos)
  else
    node.source_range
  end
end

def string_literals_config 

def string_literals_config
  config.for_cop('Style/StringLiterals')
end