Class: CoinMarketCap::Scraper

Inherits:
Object
  • Object
show all
Defined in:
lib/coin_market_cap/scraper.rb

Class Method Summary collapse

Class Method Details

.get_coin(coin) ⇒ Object 



16
17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/coin_market_cap/scraper.rb', line 16

def self.get_coin(coin)
  doc = Nokogiri::HTML(open(coin.url))

  # add attribute to the coin object
  attributes = {
    :volume => "$#{doc.search(".container .coin-summary-item:nth-child(2) .coin-summary-item-detail span:first-child span:first-child").text.strip}",
    :cir_supply => doc.search(".container .coin-summary-item:nth-child(4) .coin-summary-item-detail").text.strip.gsub(/\s/, ""),
    :max_supply => doc.search(".container .coin-summary-item:nth-child(5) .coin-summary-item-detail").text.strip.gsub(/\s/, ""),
    :website => doc.search("ul.list-unstyled li:first-child a").attr("href") }

  CoinMarketCap::Coin.add_attributes(coin, attributes)
end

.list ⇒ Object 



3
4
5
6
7
8
9
10
11
12
13
14
 
# File 'lib/coin_market_cap/scraper.rb', line 3

def self.list
  doc = Nokogiri::HTML(open("https://coinmarketcap.com/"))

  doc.search("#currencies tbody tr")[0..9].map { |coin|
    name = coin.search(".currency-name-container").text.strip
    mcap = coin.search(".market-cap").text.strip
    price = coin.search(".price").text.strip
    change = coin.search(".percent-24h").text.strip
    url = coin.search("a").attr('href') # works only with a tag
    CoinMarketCap::Coin.new(name, mcap, price, change, "https://coinmarketcap.com#{url}")
  }
end