class Dolarblue

Main class used as builder and also as Dolarblue namespace

Constants

VERSION

Public Class Methods

get_bolsablue_output() click to toggle source

Returns all the dollar bolsa exchange ‘Blue’ vs ‘Bolsa’ info

suitable for user printing analysis

@return [String] with all dollar exchange ‘Blue’ vs ‘Bolsa’ values

# File lib/dolarblue.rb, line 20
def get_bolsablue_output
  new.update!(false).bolsablue_output
end

get_output() click to toggle source

Returns all the dollar exchange ‘Blue’ vs ‘Official’ values and percentiles

suitable for user printing

@return [String] with all dollar exchange ‘Blue’ vs ‘Official’ values

# File lib/dolarblue.rb, line 12
def get_output
  new.update!.output
end

new(config = Configuration.instance) click to toggle source

Create a new Dolarblue instance to work later on

@param config [Configuration] the configuration instance

@return [Dolarblue] new instance

# File lib/dolarblue/instance_methods.rb, line 16
def initialize(config = Configuration.instance)
  @config   = config.defaults
  @blue     = Blue.new
  @official = Official.new
  @bolsa    = Bolsa.new
  self
end

Public Instance Methods

bolsablue_output() click to toggle source

Output string to be used by the binary ‘bolsablue`

@return [String] the output with bolsa/dollar exchange info

# File lib/dolarblue/instance_methods.rb, line 79
  def bolsablue_output
    n = 27
    bol_discount = 0.97
    bolsa_delay_add = 1.01
    payo_discount = 0.967
    net_ticket = 375
    sell_ticket = 396.2

    real = (@blue.sell * bol_discount).round(2)
    profit = n * (real * net_ticket * payo_discount - @bolsa.sell * bolsa_delay_add * sell_ticket)
    now = Time.now.localtime.strftime("%H:%M:%S")

    <<-OUTPUT
Bolsa[#{@bolsa.sell_output}] Blue[#{@blue.sell_output}] Gap[#{gap_bolsa_percent}%] #{now}
#{profit.round(0)}=#{n}*(#{real}*#{net_ticket}*#{payo_discount}-#{@bolsa.sell}*#{bolsa_delay_add}*#{sell_ticket})
    OUTPUT
  end

gap_bolsa_percent() click to toggle source

Returns the gap percentile between the real (blue) dollar value versus the official

@return (see gap_official_percent)

# File lib/dolarblue/instance_methods.rb, line 54
def gap_bolsa_percent
  gap_bolsa = @blue.sell / @bolsa.sell - 1
  (gap_bolsa * 100).round(0)
end

gap_official_percent() click to toggle source

Returns the gap percentile (e.g. 60) between the real (blue) dollar value versus the official

@return [Float] percentile value between 0..100

# File lib/dolarblue/instance_methods.rb, line 46
def gap_official_percent
  gap_official = @blue.sell / @official.sell - 1
  (gap_official * 100).round(0)
end

output() click to toggle source

Output string to be used by the binary ‘dolarblue`

@return [String] the output with dollar exchange information

# File lib/dolarblue/instance_methods.rb, line 62
  def output
    <<-OUTPUT
#{@official.output}
#{@bolsa.output}
#{@blue.output}

- Gap bolsa......blue: #{gap_bolsa_percent}%
- Gap official...blue: #{gap_official_percent}%

Information source:
#{@config.base_url}
    OUTPUT
  end

update!(log=true) click to toggle source

Connect to the source and retrieve dollar exchange values

@param log [Boolean] weather to show log standard outputs or not

@return (see initialize)

# File lib/dolarblue/instance_methods.rb, line 29
def update!(log=true)
  base_url = @config.base_url
  fail ArgumentError, "Need base_url configuration to know where to web-scrape from. Current value: #{base_url}" if base_url.empty?

  log "Obtaining latest AR$ vs US$ exchange values..." if log
  html_file = open(base_url)

  log "Parsing values..." if log
  parse_values Nokogiri::HTML(html_file)

  log "\nDone: #{Time.now.localtime}\n" if log
  self
end

Private Instance Methods

log(msg) click to toggle source

Poor man’s logger to keep user updated with http get activity

@param msg [String] the message to print or buffer

# File lib/dolarblue/instance_methods.rb, line 113
def log(msg)
  $stdout.print msg
end

parse_values(doc) click to toggle source

Parse dollar related values using the XPath configured

@param doc [Nokogiri::HTML] the html document to extract values from

@return [true, false] boolean If parsed successfully or not

# File lib/dolarblue/instance_methods.rb, line 104
def parse_values(doc)
  [@blue, @official, @bolsa].each do |type|
    type.extract_values(doc)
  end
end