Contents

module Quandl
module Operation
class QDFormat

class Dump

  ATTRIBUTES = [:source_code, :code, :name, :description]

  class << self

    def nodes(*args)
      Array(args).flatten.collect{|r| node(r) }.join("\n")
    end

    def node(node)
      self.new(node).to_qdf
    end

  end

  attr_accessor :node

  def initialize(r)
    self.node = r
  end

  def to_qdf
    [ attributes, 
      "-\n",
      column_names,
      data
    ].compact.join
  end

  def attributes
    attrs = ATTRIBUTES.inject({}) do |memo, name|
      name = name.to_s
      memo[name] = node.send(name) if node.respond_to?(name) && node.send(name).present?
      memo
    end
    attrs.to_yaml[4..-1]
  end
  
  def data
    data = node.data.is_a?(Array) ? node.data.collect(&:to_csv).join : node.data
    data = data.to_csv if data.respond_to?(:to_csv)
    data
  end

  def column_names
    node.column_names.to_csv if node.column_names.present?
  end

end

end
end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
quandl_operation-0.1.22	lib/quandl/operation/qdformat/dump.rb