上手いパース方法ないかなぁ

kteiden_json.rb

#!/usr/bin/env ruby -Ku
require "open-uri"
require "rubygems"
require "json"
require "time"

src = ''
group = "1-A"
begin
  open("http://kteiden.chibiegg.net/api/kteiden.json?&group=#{group}"){|file|
    src = file.read.gsub(/^\[/,"").gsub(/\]$/,"") #前後についている[]を取り払う
  }
  #jsonパーサーを使う
  json = JSON.parser.new(src)

  #突っ込むためのハッシュ作成
  h = Hash.new
  h = json.parse()

  source = h["source"].to_f
  if source == 1 then
    info = "月間予定"
  elsif source == 2 then
    info = "翌日予定"
  elsif source == 3 then
    info = "当日予定"
  else
    info = "情報なし"
  end
  t = Time.parse(h["date"])
  print "日付 : ", t.year,"/", t.month, "/", t.day, "\n"
  printf("グループ : %s\n", h["group"])
  print "計画停電対象時間 : ", h["start"], "から", h["end"], "まで\n"
  print "計画停電の有無 : ", h["is_implemented"]?  "実施有り" : "実施無し", "\n"
  print "グループ内停電順位 : ", h["order"], "\n"
  print "情報源 : ", info , "\n"
rescue JSON::ParserError
  print "json parse error."
rescue OpenURI::HTTPError
  print "Http bad request."
end