class RuboCop::Cop::Performance::Caller

caller_locations(1..1).first
caller_locations(2..2).first
caller(1..1).first
caller(2..2).first
# good

caller_locations.first
caller_locations[1]
caller.first
caller[1]
# bad
@example
can be replaced by ‘caller(n..n).first`.
This cop identifies places where `caller`

def int_value(node) 

def int_value(node)
  node.children[0]
end

def message(node) 

def message(node)
  method_name = node.receiver.method_name
  caller_arg = node.receiver.first_argument
  n = caller_arg ? int_value(caller_arg) : 1
  if node.method_name == :[]
    m = int_value(node.first_argument)
    n += m
    format(MSG_BRACE, n: n, m: m, method: method_name)
  else
    format(MSG_FIRST, n: n, method: method_name)
  end
end

def on_send(node) 

def on_send(node)
  return unless caller_with_scope_method?(node)
  add_offense(node)
end