59 lines
1.1 KiB
Ruby
59 lines
1.1 KiB
Ruby
class QuantityUnit
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def initialize(quantity, unit)
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@quantity = quantity
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@unit = unit
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end
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def self.parse(number_with_unit)
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# remove whitespace
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number_with_unit = number_with_unit.gsub(/\s+/, '')
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# to lowercase
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number_with_unit = number_with_unit.downcase
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# remove numerical part
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number = number_with_unit.gsub(/[^0-9.,]/, '')
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# remove unit part
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unit = number_with_unit.gsub(/[^a-zA-Z]/, '')
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# convert comma to dot
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number = number.gsub(',', '.')
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# convert to float
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number = number.to_f
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return nil unless unit.in?(%w[g kg l ml])
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QuantityUnit.new(number, unit)
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end
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def scale_price_to_base_unit(price)
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return nil unless price.is_a?(Numeric)
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factor = if @unit == 'kg' || @unit == 'l'
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1
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elsif @unit == 'g' || @unit == 'ml'
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1000
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end
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scaled_price = price / @quantity * factor
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scaled_price.round(2)
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base_unit = if @unit == 'kg' || @unit == 'g'
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'kg'
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elsif @unit == 'l' || @unit == 'ml'
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'L'
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end
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[scaled_price, base_unit]
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end
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def to_s
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"#{@quantity} #{@unit}"
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end
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def quantity
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@quantity
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end
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def unit
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@unit
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end
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end |