class Chronic::Parser

def definitions(options = {})
  options[:endian_precedence] ||= [:middle, :little]
  @@definitions ||= {
    :time => [
      Handler.new([:repeater_time, :repeater_day_portion?], nil)
    ],
    :date => [
      Handler.new([:repeater_day_name, :repeater_month_name, :scalar_day, :repeater_time, :separator_slash_or_dash?, :time_zone, :scalar_year], :handle_generic),
      Handler.new([:repeater_day_name, :repeater_month_name, :scalar_day], :handle_rdn_rmn_sd),
      Handler.new([:repeater_day_name, :repeater_month_name, :scalar_day, :scalar_year], :handle_rdn_rmn_sd_sy),
      Handler.new([:repeater_day_name, :repeater_month_name, :ordinal_day], :handle_rdn_rmn_od),
      Handler.new([:repeater_day_name, :repeater_month_name, :scalar_day, :separator_at?, 'time?'], :handle_rdn_rmn_sd),
      Handler.new([:repeater_day_name, :repeater_month_name, :ordinal_day, :separator_at?, 'time?'], :handle_rdn_rmn_od),
      Handler.new([:repeater_day_name, :ordinal_day, :separator_at?, 'time?'], :handle_rdn_od),
      Handler.new([:scalar_year, :separator_slash_or_dash, :scalar_month, :separator_slash_or_dash, :scalar_day, :repeater_time, :time_zone], :handle_generic),
      Handler.new([:repeater_month_name, :scalar_day, :scalar_year], :handle_rmn_sd_sy),
      Handler.new([:repeater_month_name, :ordinal_day, :scalar_year], :handle_rmn_od_sy),
      Handler.new([:repeater_month_name, :scalar_day, :scalar_year, :separator_at?, 'time?'], :handle_rmn_sd_sy),
      Handler.new([:repeater_month_name, :ordinal_day, :scalar_year, :separator_at?, 'time?'], :handle_rmn_od_sy),
      Handler.new([:repeater_month_name, :separator_slash_or_dash?, :scalar_day, :separator_at?, 'time?'], :handle_rmn_sd),
      Handler.new([:repeater_time, :repeater_day_portion?, :separator_on?, :repeater_month_name, :scalar_day], :handle_rmn_sd_on),
      Handler.new([:repeater_month_name, :ordinal_day, :separator_at?, 'time?'], :handle_rmn_od),
      Handler.new([:ordinal_day, :repeater_month_name, :scalar_year, :separator_at?, 'time?'], :handle_od_rmn_sy),
      Handler.new([:ordinal_day, :repeater_month_name, :separator_at?, 'time?'], :handle_od_rmn),
      Handler.new([:ordinal_day, :grabber?, :repeater_month, :separator_at?, 'time?'], :handle_od_rm),
      Handler.new([:scalar_year, :repeater_month_name, :ordinal_day], :handle_sy_rmn_od),
      Handler.new([:repeater_time, :repeater_day_portion?, :separator_on?, :repeater_month_name, :ordinal_day], :handle_rmn_od_on),
      Handler.new([:repeater_month_name, :scalar_year], :handle_rmn_sy),
      Handler.new([:scalar_day, :repeater_month_name, :scalar_year, :separator_at?, 'time?'], :handle_sd_rmn_sy),
      Handler.new([:scalar_day, :separator_slash_or_dash?, :repeater_month_name, :separator_at?, 'time?'], :handle_sd_rmn),
      Handler.new([:scalar_year, :separator_slash_or_dash, :scalar_month, :separator_slash_or_dash, :scalar_day, :separator_at?, 'time?'], :handle_sy_sm_sd),
      Handler.new([:scalar_year, :separator_slash_or_dash, :scalar_month], :handle_sy_sm),
      Handler.new([:scalar_month, :separator_slash_or_dash, :scalar_year], :handle_sm_sy),
      Handler.new([:scalar_day, :separator_slash_or_dash, :repeater_month_name, :separator_slash_or_dash, :scalar_year, :repeater_time?], :handle_sm_rmn_sy),
      Handler.new([:scalar_year, :separator_slash_or_dash, :scalar_month, :separator_slash_or_dash, :scalar?, :time_zone], :handle_generic),
    ],
    :anchor => [
      Handler.new([:separator_on?, :grabber?, :repeater, :separator_at?, :repeater?, :repeater?], :handle_r),
      Handler.new([:grabber?, :repeater, :repeater, :separator?, :repeater?, :repeater?], :handle_r),
      Handler.new([:repeater, :grabber, :repeater], :handle_r_g_r)
    ],
    :arrow => [
      Handler.new([:scalar, :repeater, :pointer], :handle_s_r_p),
      Handler.new([:scalar, :repeater, :separator_and?, :scalar, :repeater, :pointer, :separator_at?, 'anchor'], :handle_s_r_a_s_r_p_a),
      Handler.new([:pointer, :scalar, :repeater], :handle_p_s_r),
      Handler.new([:scalar, :repeater, :pointer, :separator_at?, 'anchor'], :handle_s_r_p_a)
    ],
    :narrow => [
      Handler.new([:ordinal, :repeater, :separator_in, :repeater], :handle_o_r_s_r),
      Handler.new([:ordinal, :repeater, :grabber, :repeater], :handle_o_r_g_r)
    ]
  }
  endians = [
    Handler.new([:scalar_month, :separator_slash_or_dash, :scalar_day, :separator_slash_or_dash, :scalar_year, :separator_at?, 'time?'], :handle_sm_sd_sy),
    Handler.new([:scalar_month, :separator_slash_or_dash, :scalar_day, :separator_at?, 'time?'], :handle_sm_sd),
    Handler.new([:scalar_day, :separator_slash_or_dash, :scalar_month, :separator_at?, 'time?'], :handle_sd_sm),
    Handler.new([:scalar_day, :separator_slash_or_dash, :scalar_month, :separator_slash_or_dash, :scalar_year, :separator_at?, 'time?'], :handle_sd_sm_sy)
  ]
  case endian = Array(options[:endian_precedence]).first
  when :little
    @@definitions.merge(:endian => endians.reverse)
  when :middle
    @@definitions.merge(:endian => endians)
  else
    raise ArgumentError, "Unknown endian option '#{endian}'"
  end
end