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Versions: 10
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Contents
class Measured::Unit
include Comparable
def initialize(name, aliases: [], value: nil)
@name = name.to_s
@names = ([@name] + aliases.map{|n| n.to_s }).sort
@conversion_amount, @conversion_unit = parse_value(value) if value
end
attr_reader :name, :names, :conversion_amount, :conversion_unit
def to_s
if conversion_string
"#{ @name } (#{ conversion_string })"
else
@name
end
end
def inspect
"#<Measured::Unit: #{ @name } (#{ @names.join(", ") }) #{ conversion_string }>"
end
def <=>(other)
if self.class == other.class
if other.names != @names
other.names <=> @names
else
other.conversion_amount <=> @conversion_amount
end
else
@name <=> other
end
end
def inverse_conversion_amount
if conversion_amount.is_a?(Rational)
Rational(conversion_amount.denominator, conversion_amount.numerator)
else
BigDecimal(1) / conversion_amount
end
end
private
def conversion_string
"#{ conversion_amount } #{ conversion_unit }" if @conversion_amount || @conversion_unit
end
def parse_value(tokens)
tokens = tokens.split(" ") if tokens.is_a?(String)
raise Measured::UnitError, "Cannot parse 'number unit' or [number, unit] formatted tokens from #{ tokens }." unless tokens.size == 2
tokens[0] = BigDecimal(tokens[0]) unless tokens[0].is_a?(BigDecimal) || tokens[0].is_a?(Rational)
tokens
end
end
Version data entries
10 entries across 10 versions & 1 rubygems