Class: CommerceUnits::Unit

Inherits:
Object
  • Object
show all
Defined in:
lib/commerce_units/unit.rb

Defined Under Namespace

Classes: RequireOrdInstance

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Unit

Returns a new instance of Unit.



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# File 'lib/commerce_units/unit.rb', line 22

def initialize
  @numerator = []
  @denominator = []
end

Instance Attribute Details

#denominator ⇒ Object

Returns the value of attribute denominator.



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# File 'lib/commerce_units/unit.rb', line 21

def denominator
  @denominator
end

#numerator ⇒ Object

Returns the value of attribute numerator.



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# File 'lib/commerce_units/unit.rb', line 21

def numerator
  @numerator
end

Class Method Details

.divide(ua, ub) ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 10

def divide(ua, ub)
  multiply ua, ub.flip
end

.equals?(ua, ub) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/commerce_units/unit.rb', line 13

def equals?(ua, ub)
  divide(ua, ub).unitless?
end

.multiply(ua, ub) ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 4

def multiply(ua, ub)
  new.tap do |u|
    u.numerator = ua.numerator + ub.numerator
    u.denominator = ua.denominator + ub.denominator
  end.simplify
end

.parse(string) ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 16

def parse(string)
  CommerceUnits::UnitParser.parse(string)
end

Instance Method Details

#*(other) ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 27

def *(other)
  self.class.multiply self, other
end

#/(other) ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 31

def /(other)
  self.class.divide self, other
end

#==(unit) ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 70

def ==(unit)
  s = self.simplify
  u = unit.simplify
  s.numerator == u.numerator && s.denominator == u.denominator
end

#flip ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 46

def flip
  CommerceUnits::Unit.new.tap do |u|
    u.numerator = denominator
    u.denominator = numerator
  end
end

#pretty_inspect ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 80

def pretty_inspect
  n = numerator.join(" * ")
  d = denominator.join(" * ")
  n = n.blank? ? "(1)" : n
  [n,d].reject(&:blank?).join(" / ")
end

#simplify ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 35

def simplify
  CommerceUnits::Unit.new.tap do |u|
    u.numerator = _simplifier.numerator
    u.denominator = _simplifier.denominator
  end
end

#to_root_dimension ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 53

def to_root_dimension
  CommerceUnits::Unit.new.tap do |u|
    u.numerator = CommerceUnits.dimensional_database.from_array_of_unit_names!(numerator).map(&:root_dimension)
    u.denominator = CommerceUnits.dimensional_database.from_array_of_unit_names!(denominator).map(&:root_dimension)
  end
end

#to_s ⇒ Object 



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# File 'lib/commerce_units/unit.rb', line 76

def to_s
  '#<CommerceUnits::Unit:' + self.object_id.to_s + " @numerator=#{numerator}, @denominator=#{denominator}>"
end

#unitless? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/commerce_units/unit.rb', line 42

def unitless?
  numerator.blank? and denominator.blank?
end