class Cucumber::CucumberExpressions::ParameterTypeRegistry

def define_parameter_type(parameter_type)
  if parameter_type.name != nil
    if @parameter_type_by_name.has_key?(parameter_type.name)
      if parameter_type.name.length == 0
        raise CucumberExpressionError.new("The anonymous parameter type has already been defined")
      else
        raise CucumberExpressionError.new("There is already a parameter with name #{parameter_type.name}")
      end
    end
    @parameter_type_by_name[parameter_type.name] = parameter_type
  end
  parameter_type.regexps.each do |parameter_type_regexp|
    parameter_types = @parameter_types_by_regexp[parameter_type_regexp]
    if parameter_types.any? && parameter_types[0].prefer_for_regexp_match? && parameter_type.prefer_for_regexp_match?
      raise CucumberExpressionError.new("There can only be one preferential parameter type per regexp. The regexp /#{parameter_type_regexp}/ is used for two preferential parameter types, {#{parameter_types[0].name}} and {#{parameter_type.name}}")
    end
    parameter_types.push(parameter_type)
    parameter_types.sort!
  end
end

def initialize
  @parameter_type_by_name = {}
  @parameter_types_by_regexp = Hash.new {|hash, regexp| hash[regexp] = []}
  define_parameter_type(ParameterType.new('int', INTEGER_REGEXPS, Integer, lambda {|s = nil| s && s.to_i}, true, true))
  define_parameter_type(ParameterType.new('float', FLOAT_REGEXP, Float, lambda {|s = nil| s && s.to_f}, true, false))
  define_parameter_type(ParameterType.new('word', WORD_REGEXP, String, lambda {|s = nil| s}, false, false))
  define_parameter_type(ParameterType.new('string', STRING_REGEXP, String, lambda {|s = nil| s && s.gsub(/\\"/, '"').gsub(/\\'/, "'")}, true, false))
  define_parameter_type(ParameterType.new('', ANONYMOUS_REGEXP, String, lambda {|s = nil| s}, false, true))
end

def lookup_by_regexp(parameter_type_regexp, expression_regexp, text)
  parameter_types = @parameter_types_by_regexp[parameter_type_regexp]
  return nil if parameter_types.nil?
  if parameter_types.length > 1 && !parameter_types[0].prefer_for_regexp_match?
    # We don't do this check on insertion because we only want to restrict
    # ambiguity when we look up by Regexp. Users of CucumberExpression should
    # not be restricted.
    generated_expressions = CucumberExpressionGenerator.new(self).generate_expressions(text)
    raise AmbiguousParameterTypeError.new(parameter_type_regexp, expression_regexp, parameter_types, generated_expressions)
  end
  parameter_types.first
end

def lookup_by_type_name(name)
  @parameter_type_by_name[name]
end

def parameter_types
  @parameter_type_by_name.values
end