Class: Panier::Application::InputReader

Inherits:
Object
  • Object
show all
Defined in:
lib/panier/application/input_reader.rb

Overview

The InputReader is responsible for parsing raw input data.

Constant Summary collapse

CELLS_PER_LINE = 
3
HEADER = 
/quantity.*?,.*?product.*?,.*?price/i

Instance Method Summary collapse

Constructor Details

#initialize(product_service = nil) ⇒ InputReader

Returns a new instance of InputReader.



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# File 'lib/panier/application/input_reader.rb', line 14

def initialize(product_service = nil)
  @product_service = product_service ||
      Panier::Domain::ProductService.new
end

Instance Method Details

#parse_input(input) ⇒ Object 



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# File 'lib/panier/application/input_reader.rb', line 19

def parse_input(input)
  line_items = input.lines.reject(&:blank?).map do |line|
    parse_line(line)
  end
  line_items.reject(&:nil?)
end

#parse_line(line) ⇒ Object 



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# File 'lib/panier/application/input_reader.rb', line 26

def parse_line(line)
  return nil if line.match(HEADER)
  parsed = CSV.parse_line(line)
  unless parsed.count == CELLS_PER_LINE
    fail ArgumentError, 'invalid input'
  end
  quantity = Integer(parsed[0])
  name = parsed[1].strip
  price = Money.new(Float(parsed[2]) * 100)

  product = @product_service.find_by_name_and_price(name, price)
  product.present? ? LineItem.new(product, quantity) : nil
end