module SimpleForm::Components::Maxlength

def find_length_validator
  find_validator(ActiveModel::Validations::LengthValidator)
end

def has_tokenizer?(length_validator)
  tokenizer = length_validator.options[:tokenizer]
  # TODO: Remove this check when we drop Rails 3.0 support
  if ActiveModel::Validations::LengthValidator.const_defined?(:DEFAULT_TOKENIZER)
    tokenizer && tokenizer != ActiveModel::Validations::LengthValidator::DEFAULT_TOKENIZER
  else
    tokenizer
  end
end

def maximum_length_from_validation
  maxlength = options[:maxlength]
  if maxlength.is_a?(String) || maxlength.is_a?(Integer)
    maxlength
  else
    length_validator = find_length_validator
    if length_validator && !has_tokenizer?(length_validator)
      length_validator.options[:is] || length_validator.options[:maximum]
    end
  end
end

def maxlength
  input_html_options[:maxlength] ||= maximum_length_from_validation || limit
  nil
end