class RuboCop::Cop::Lint::DeprecatedConstants


Etc::Passwd
Etc::Group
Random.new # ‘::DEFAULT` has been deprecated in Ruby 3, `.new` is compatible with Ruby 2.
Net::HTTPClientException
false
true
nil
# good
Struct::Passwd
Struct::Group
Random::DEFAULT # Return value of Ruby 2 is `Random` instance, Ruby 3.0 is `Random` class.
Net::HTTPServerException
FALSE
TRUE
NIL
# bad
@example
`Struct::Group`, and `Struct::Passwd` are configured.
By default, `NIL`, `TRUE`, `FALSE`, `Net::HTTPServerException, `Random::DEFAULT`,
DeprecatedVersion: ’deprecated_version’
Alternative: ‘alternative_value’
‘DEPRECATED_CONSTANT’:
DeprecatedConstants:
‘DeprecatedVersion`. These options can be omitted if they are not needed.
alternative value as `Alternative`. And you can set the deprecated version as
It has `DeprecatedConstants` config. If there is an alternative method, you can set
Checks for deprecated constants.

def constant_name(node, nested_constant_name) 

def constant_name(node, nested_constant_name)
  return nested_constant_name.to_s unless node.namespace.const_type?
  constant_name(node.namespace, "#{node.namespace.short_name}::#{nested_constant_name}")
end

def deprecated_constants 

def deprecated_constants
  cop_config.fetch('DeprecatedConstants', {})
end

def message(good, bad, deprecated_version) 

def message(good, bad, deprecated_version)
  deprecated_message = ", deprecated since Ruby #{deprecated_version}" if deprecated_version
  if good
    format(SUGGEST_GOOD_MSG, good: good, bad: bad, deprecated_message: deprecated_message)
  else
    format(DO_NOT_USE_MSG, bad: bad, deprecated_message: deprecated_message)
  end
end

def on_const(node) 

def on_const(node)
  # FIXME: Workaround for "`undefined method `expression' for nil:NilClass`" when processing
  #        `__ENCODING__`. It is better to be able to work without this condition.
  #        Maybe further investigation of RuboCop AST will lead to an essential solution.
  return unless node.loc
  constant = node.absolute? ? constant_name(node, node.short_name) : node.source
  return unless (deprecated_constant = deprecated_constants[constant])
  alternative = deprecated_constant['Alternative']
  version = deprecated_constant['DeprecatedVersion']
  return if target_ruby_version < version.to_f
  add_offense(node, message: message(alternative, node.source, version)) do |corrector|
    corrector.replace(node, alternative)
  end
end