amatenの価格調べ

amaten rate

require 'nokogiri'
require 'open-uri'

base_url = 'https://amaten.jp/exhibitions/past_gifts?page=%s&type=amazon'

last_line = 0;
current_line = 0;
page = 1;

loop do
    url = sprintf(base_url, page)
    charset = nil
    html = open(url) do |f|
        charset = f.charset
        f.read
    end

    doc = Nokogiri::HTML.parse(html, nil, charset)
    table = doc.css('table#gift_list')

    table.css('tr.odd').each{|line|
        datatime = line.css('td.cellLimit')
        price = line.css('td.cellPrice')
        rate = line.css('td.cellRate')

        print datatime.text + ", " + rate.text + "\n"
        current_line+=1
    }

    page+=1

    if current_line == last_line then
        break
    else
        last_line = current_line
    end
end