Module: Sp500

Defined in:
lib/sp500.rb,
lib/sp500/version.rb

Constant Summary collapse

VERSION = 
"0.1.1"

Class Method Summary collapse

Class Method Details

.by_industries ⇒ Object 



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# File 'lib/sp500.rb', line 76

def by_industries
  result = {}

  list.each do |item| 
    result[item[:gics_sector]] ||= {}
    result[item[:gics_sector]][item[:gics_sub_industry]] ||= []
    result[item[:gics_sector]][item[:gics_sub_industry]] << item
  end

  result
end

.by_sectors ⇒ Object 



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# File 'lib/sp500.rb', line 65

def by_sectors
  result = {}

  list.each do |item|
    result[item[:gics_sector]] ||= []
    result[item[:gics_sector]] << item
  end

  result
end

.industries ⇒ Object 



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# File 'lib/sp500.rb', line 54

def industries
  result = {}

  list.each do |item| 
    result[item[:gics_sector]] ||= []
    result[item[:gics_sector]] << item[:gics_sub_industry] unless result[item[:gics_sector]].include?(item[:gics_sub_industry])
  end

  result
end

.list ⇒ Object 



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# File 'lib/sp500.rb', line 14

def list
  doc = Nokogiri::HTML(open("https://en.wikipedia.org/wiki/List_of_S%26P_500_companies"))

  doc.at_xpath("//div[@id='mw-content-text']//table[contains(@class,'wikitable')]").search('tr').map do |row|
    cells = row.search('td').map do |cell| 
      if cell.search('a').length > 0
        [
          cell.search('a')[0].text.strip, 
          cell.search('a')[0]['href']
        ]
      else
        cell.text.strip
      end
    end

    next if cells.empty?

    {
      ticker_symbol: cells[0][0],
      nyse_quote_url: cells[0][1],
      firm_name: cells[1][0],
      firm_wikipedia_url: cells[1][1],
      sec_filling_type: cells[2][0],
      sec_fillings_doc_url: cells[2][1],
      gics_sector: cells[3],
      gics_sub_industry: cells[4],
      firm_hq_address: cells[5][0],
      firm_hq_address_url: cells[5][1],
      sp500_introduction_date: (cells[6].blank? ? 'n/a' : Date.parse(cells[6])),
      central_index_key: cells[7]
    }
  end.compact
end

.sectors ⇒ Object 



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# File 'lib/sp500.rb', line 48

def sectors
  list.map do |item| 
    item[:gics_sector]
  end.uniq.sort
end