class Cucumber::CucumberExpressions::Argument

def self.build(tree_regexp, text, parameter_types)
  group = tree_regexp.match(text)
  return nil if group.nil?
  arg_groups = group.children
  if arg_groups.length != parameter_types.length
    raise CucumberExpressionError.new(
      "Expression #{tree_regexp.regexp.inspect} has #{arg_groups.length} capture groups (#{arg_groups.map(&:value)}), " \
      "but there were #{parameter_types.length} parameter types (#{parameter_types.map(&:name)})"
    )
  end
  parameter_types.zip(arg_groups).map do |parameter_type, arg_group|
    Argument.new(arg_group, parameter_type)
  end
end

def initialize(group, parameter_type)
  @group, @parameter_type = group, parameter_type
end

def value(self_obj = :nil)
  raise 'No self_obj' if self_obj == :nil
  group_values = @group ? @group.values : nil
  @parameter_type.transform(self_obj, group_values)
end