class RuboCop::Cop::Style::StderrPuts

Identifies places where `$stderr.puts` can be replaced by `warn`. The latter has the advantage of easily being disabled by, the `-W0` interpreter flag or setting `$VERBOSE` to `nil`.

@example

# bad
$stderr.puts('hello')

# good
warn('hello')

Constants

MSG
RESTRICT_ON_SEND

Public Instance Methods

on_send(node) click to toggle source
# File lib/rubocop/cop/style/stderr_puts.rb, line 32
def on_send(node)
  return unless stderr_puts?(node)

  message = message(node)
  add_offense(stderr_puts_range(node), message: message) do |corrector|
    corrector.replace(stderr_puts_range(node), 'warn')
  end
end

Private Instance Methods

message(node) click to toggle source
# File lib/rubocop/cop/style/stderr_puts.rb, line 43
def message(node)
  format(MSG, bad: "#{node.receiver.source}.#{node.method_name}")
end
stderr_gvar?(sym) click to toggle source
# File lib/rubocop/cop/style/stderr_puts.rb, line 47
def stderr_gvar?(sym)
  sym == :$stderr
end
stderr_puts_range(send) click to toggle source
# File lib/rubocop/cop/style/stderr_puts.rb, line 51
def stderr_puts_range(send)
  range_between(send.loc.expression.begin_pos, send.loc.selector.end_pos)
end