64 lines
1.3 KiB
Ruby
64 lines
1.3 KiB
Ruby
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module UnitConversion
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class ParsedUnit
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attr_reader :original_unit, :unit
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def initialize(str)
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@original_unit = str
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@unit = normalize_unit_names(str)
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end
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def to_s
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unit.gsub(/[a-z_\[\]]+/) do |match|
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if aliases = UNIT_ALIASES[match.to_sym]
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aliases.first
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else
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match
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end
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end
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end
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def density?
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compatible? 'g/ml'
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end
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def volume?
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compatible? 'ml'
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end
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def mass?
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compatible? 'g'
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end
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def metric?
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METRIC_UNIT_ALIASES.keys.include? unit.to_sym
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end
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def unitwise(value = 1)
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begin
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Unitwise(value, unit)
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rescue Unitwise::ExpressionError => err
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raise UnknownUnitError, err.message
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end
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end
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def compatible?(unit_str)
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begin
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unitwise.compatible_with? Unitwise(1, unit_str)
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rescue UnknownUnitError
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false
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end
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end
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def normalize_unit_names(unit_description)
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return unit_description.to_s if UNIT_ALIASES.include?(unit_description.to_sym)
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# fluid ounce is the only known unit with a space; fix it up before the following replacement
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unit_description = unit_description.gsub(/fl oz/i, 'floz')
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unit_description.downcase.gsub(/[a-z_\[\]]+/) do |match|
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UNIT_ALIAS_MAP[match] || match
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end
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end
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end
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end
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