Class: YahooStock::Interface

Inherits:
Object
  • Object
show all
Defined in:
lib/yahoo_stock/interface.rb

Overview

DESCRIPTION:

Class to generate the right url and interface with yahoo

Defined Under Namespace

Classes: InterfaceError

Constant Summary collapse

PARAMETERS = 
{
  :ask => 'a',
  :average_daily_volume => 'a2',
  :ask_size => 'a5',
  :bid => 'b',
  :ask_real_time => 'b2',
  :bid_real_time => 'b3',
  :book_value => 'b4',
  :bid_size => 'b4',
  :change_with_percent_change => 'c',
  :change => 'c1',
  :commission => 'c3',
  :change_real_time => 'c6',
  :after_hours_change_real_time => 'c8',
  :dividend_per_share => 'd',
  :last_trade_date => 'd1',
  :trade_date => 'd2',
  :earnings_per_share => 'e',
  :error_indication => 'e1',
  :eps_estimate_current_year => 'e7',
  :eps_estimate_next_year => 'e8',
  :eps_estimate_next_quarter => 'e9',
  :day_low => 'g',
  :day_high => 'h',
  :fifty_two_week_low => 'j',
  :fifty_two_week_high => 'k',
  :holdings_gain_percent => 'g1',
  :annualized_gain => 'g3',
  :holdings_gain => 'g4',
  :holdings_gain_percent_real_time => 'g5',
  :holdings_gain_real_time => 'g6',
  :more_info => 'i',
  :order_book_real_time => 'i5',
  :market_capitalization => 'j1',
  :market_cap_real_time => 'j3',
  :ebitda => 'j4',
  :change_from_52_week_low => 'j5',
  :percent_change_from_52_week_low => 'j6',
  :last_trade_real_time_with_time => 'k1',
  :change_percent_real_time => 'k2',
  :change_from_52_week_high => 'k4',
  :percent_change_from_52_week_high => 'k5',
  :last_trade_with_time => 'l',
  :last_trade_price_only => 'l1',
  :high_limit => 'l2',
  :low_limit => 'l3',
  :day_range => 'm',
  :day_range_real_time => 'm2',
  :fifty_day_moving_average => 'm3',
  :two_hundred_day_moving_average => 'm4',
  :change_from_200_day_moving_average => 'm5',
  :percent_change_from_200_day_moving_average => 'm6',
  :change_from_50_day_moving_average => 'm7',
  :percent_change_from_50_day_moving_average => 'm8',
  :name => 'n',
  :notes => 'n4',
  :open => 'o',
  :previous_close => 'p',
  :price_paid => 'p1',
  :change_in_percent => 'p2',
  :ex_dividend_date => 'q',
  :p_e_ratio => 'r',
  :dividend_pay_date => 'r1',
  :p_e_ratio_real_time => 'r2',
  :peg_ratio => 'r5',
  :price_eps_estimate_current_year => 'r6',
  :price_eps_estimate_next_year => 'r7',
  :symbol => 's',
  :shares_owned => 's1',
  :short_ratio => 's7',
  :last_trade_time => 't1',
  :trade_links => 't6',
  :ticker_trend => 't7',
  :one_yr_target_price => 't8',
  :volume => 'v',
  :holdings_value => 'v1',
  :holdings_value_real_time => 'v7',
  :fifty_two_week_range => 'w',
  :day_value_change => 'w1',
  :day_value_change_real_time => 'w4',
  :stock_exchange => 'x',
  :dividend_yield => 'y',
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(stock_params_hash) ⇒ Interface

The stock_params_hash parameter expects a hash with two key value pairs

:stock_symbols => ‘Array of stock symbols’

e.g. :stock_symbols => [‘YHOO’]

another hash :read_parameters => ‘array of values’

e.g. :read_parameters => [:last_trade_price_only, :last_trade_date]



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# File 'lib/yahoo_stock/interface.rb', line 114

def initialize(stock_params_hash)
  unless stock_params_hash
    raise InterfaceError, 'You must pass a hash of stock symbols and the data you would like to see' 
  end
  if !stock_params_hash[:stock_symbols]  || stock_params_hash[:stock_symbols].length.zero?
    raise(InterfaceError, 'No stocks passed')
  end
  if !stock_params_hash[:read_parameters] || stock_params_hash[:read_parameters].length.zero?
    raise InterfaceError, 'Dont know what data to get'
  end
  @stock_symbols = stock_params_hash[:stock_symbols]
  @yahoo_url_parameters    = stock_params_hash[:read_parameters]
  @base_url      = "http://download.finance.yahoo.com/d/quotes.csv"
end

Instance Attribute Details

#stock_symbols ⇒ Object

Returns the value of attribute stock_symbols.



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# File 'lib/yahoo_stock/interface.rb', line 103

def stock_symbols
  @stock_symbols
end

#yahoo_url_parameters ⇒ Object

Returns the value of attribute yahoo_url_parameters.



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# File 'lib/yahoo_stock/interface.rb', line 103

def yahoo_url_parameters
  @yahoo_url_parameters
end

Instance Method Details

#add_parameters(*parameters) ⇒ Object

Add parameters to the url.



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# File 'lib/yahoo_stock/interface.rb', line 187

def add_parameters(*parameters)
  parameters.each do |parameter|
    unless allowed_parameters.include?(parameter)
      raise InterfaceError, "Interface parameter #{parameter} is not a valid parameter."
    end
    unless yahoo_url_parameters.include?(parameter)
      yahoo_url_parameters << parameter
    end
  end
end

#add_symbols(*symbols) ⇒ Object

Add stock symbols to the url.



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# File 'lib/yahoo_stock/interface.rb', line 168

def add_symbols(*symbols)
  symbols.each do |symbol|
    unless stock_symbols.include?(symbol)
      stock_symbols << symbol
    end
  end
end

#allowed_parameters ⇒ Object

Returns an array of parameters that can be passed to yahoo.



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# File 'lib/yahoo_stock/interface.rb', line 209

def allowed_parameters
  parameters.keys
end

#full_url ⇒ Object

Generate full url to be sent to yahoo



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# File 'lib/yahoo_stock/interface.rb', line 130

def full_url
  all_stock_symbols = stock_symbols.join('+')
  params = yahoo_url_parameters-allowed_parameters
  unless params.length.zero?
    raise InterfaceError, "The parameters '#{params.join(', ')}' are not valid. Please check using YahooStock::Interface#allowed_parameters or YahooStock::Quote#valid_parameters" 
  end
  parameter_values  = yahoo_url_parameters.collect {|v| parameters[v]}.join('')
  if all_stock_symbols.empty?
    raise InterfaceError, "You must add atleast one stock symbol to get stock data" 
  end
  if parameter_values.empty?
    raise InterfaceError, "You must add atleast one parameter to get stock data" 
  end
  "#{@base_url}?s=#{all_stock_symbols}&f=#{parameter_values}"
end

#get_values ⇒ Object

Get the csv file and create an array of different stock symbols and values returned for the parameters passed based on line break.



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# File 'lib/yahoo_stock/interface.rb', line 148

def get_values
  Net::HTTP.get(URI.parse(full_url)).gsub(/\"/,'').split(/\r\n/)
end

#remove_parameters(*parameters) ⇒ Object

Remove parameters from the url.



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# File 'lib/yahoo_stock/interface.rb', line 199

def remove_parameters(*parameters)
  parameters.each do |parameter|
    unless yahoo_url_parameters.include?(parameter)
      raise InterfaceError, "Parameter #{parameter} is not present in current list"
    end
    yahoo_url_parameters.reject!{|parameter_key| parameter_key == parameter}
  end
end

#remove_symbols(*symbols) ⇒ Object

Remove stock symbols from the url.



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# File 'lib/yahoo_stock/interface.rb', line 177

def remove_symbols(*symbols)
  symbols.each do |symbol|
    unless stock_symbols.include?(symbol)
      raise InterfaceError, "Cannot remove stock symbol #{symbol} as it is currently not present."
    end
    stock_symbols.reject!{|stock_sym| stock_sym == symbol}
  end
end

#results ⇒ Object

Returns results for the stock symbols as a hash. The hash keys are the stock symbols and the values are a hash of the keys and values asked for that stock.



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# File 'lib/yahoo_stock/interface.rb', line 155

def results
  stock = {}
  get_values.each_with_index do |values, index|
    parsed_values = values.split(',')
    stock[stock_symbols[index]] ||= {}
    parsed_values.each_with_index do |value, i|
      stock[stock_symbols[index]][yahoo_url_parameters[i]] = value
    end
  end
  stock
end