class Unitwise::Expression::Composer
Composer
creates string expressions for arrays of terms, following UCUM's conventions.
Attributes
mode[R]
terms[R]
Public Class Methods
new(terms, mode)
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# File lib/unitwise/expression/composer.rb, line 7 def initialize(terms, mode) @terms = terms @mode = mode || :primary_code end
Public Instance Methods
denominator()
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# File lib/unitwise/expression/composer.rb, line 27 def denominator @denominator ||= set.select{ |_, v| v < 0 }.map do |k, v| "#{ k[:f] if k[:f] != 1 }#{ k[:p] }#{ k[:a] }#{ -v if v != -1 }" end.select { |t| !t.empty? }.join('.') end
expression()
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# File lib/unitwise/expression/composer.rb, line 33 def expression @expression = [] @expression << (numerator.empty? ? '1' : numerator) (@expression << denominator) unless denominator.empty? @expression.join('/') end
numerator()
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# File lib/unitwise/expression/composer.rb, line 21 def numerator @numerator ||= set.select{ |_, v| v > 0 }.map do |k, v| "#{ k[:f] if k[:f] != 1 }#{ k[:p] }#{ k[:a] }#{ v if v != 1 }" end.select { |t| !t.empty? }.join('.') end
set()
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# File lib/unitwise/expression/composer.rb, line 12 def set @set ||= terms.reduce(SignedMultiset.new) do |s, t| identifier = { :f => t.factor, :p => (t.prefix.to_s(mode) if t.prefix), :a => (t.atom.to_s(mode) if t.atom) } s.increment(identifier, t.exponent); s end end