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class Ingredient
class << self
def inherited(klass)
ingredients << klass
end
attr_accessor :ingredients
def ingredient(name, amount)
name = name.to_s.gsub(/_/, '').capitalize
if klass = ingredients.find { |n| n.to_s == name }
klass.new(amount)
else
raise "unknown ingredient #{name}"
end
end
end
self.ingredients = []
def initialize(amount = 1)
@amount = amount
end
def name
self.class.name.downcase
end
attr_reader :amount
def to_s
"#@amount #{name}"
end
end
class Unit
class << self
def inherited(klass)
units << klass
end
attr_accessor :units
def unit(name, amount)
name = name.to_s.gsub(/s$/, '').capitalize
if klass = units.find { |n| n.to_s == name }
klass.new(amount)
end
end
end
self.units = []
def initialize(n = 1)
@n = n
end
def name
self.class.name.downcase
end
attr_reader :n
def to_s
"#@n #{name}#{@n > 1 ? 's' : ''}"
end
end
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