Module: H::Units

Defined in:
lib/h/units.rb

Constant Summary collapse

UNIT_SYN = 
{
  'm2'=>'m**2',
  'kp/m2'=>'kp/m**2',
  '"'=>:inch,
  '\''=>:ft,
  "''"=>:inch,
  'in'=>:inch
}

Class Method Summary collapse

Class Method Details

.denormalize_units(u) ⇒ Object

Convert a units expression to the format to be presented to the user



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# File 'lib/h/units.rb', line 41

def denormalize_units(u)
  if u.blank?
    u = nil
  else
    u = u.to_s.gsub('**','^').tr('*',' ')
  end
  u
end

.normalize_units(u) ⇒ Object

Convert a units expression to a Ruby expression valid for units-syste



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# File 'lib/h/units.rb', line 24

def normalize_units(u)
  if u.blank?
    u = nil
  else
    u = u.to_s
    u = UNIT_SYN[u] || u
    u = u.to_s.gsub('^','**').tr(' ','*')
    begin
      ::Units.u(u)
    rescue
      u = nil
    end
  end
  u
end

.valid?(u) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/h/units.rb', line 18

def valid?(u)
  u = normalize_units(u)
  u && ::Units.u(u) rescue nil
end