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Contents
# :encoding: utf-8
module H
module Units
UNIT_SYN = {
'm2'=>'m**2',
'kp/m2'=>'kp/m**2',
'"'=>:inch,
'\''=>:ft,
"''"=>:inch,
'in'=>:inch
}
class <<self
def valid?(u)
u = normalize_units(u)
u && ::Units.u(u) rescue nil
end
# Convert a units expression to a Ruby expression valid for units-syste
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
# Convert a units expression to the format to be presented to the user
def denormalize_units(u)
if u.blank?
u = nil
else
u = u.to_s.gsub('**','^').tr('*',' ')
end
u
end
end
end
class <<self
def magnitude_to(v, options={})
return options[:blank] || '' if v.nil?
norm_units = options[:units]
txt = number_to(v, options)
txt << " #{H::Units.denormalize_units(norm_units)}"
txt
end
def magnitude_from(txt, options={})
return nil if txt.to_s.strip.empty? || txt==options[:blank]
norm_units = options[:units]
if txt.match(/^\s*([0-9\.,+-]+)\s*([a-zA-Z\"\'][a-zA-Z1-3\_\/\*\^\"\']*)\s*$/)
txt = $1
from_units = $2 || norm_units
else
from_units = norm_units
end
from_units = H::Units.normalize_units(from_units)
raise ArgumentError, "Invalid units for #{norm_units}: #{from_units}}" unless from_units
v = number_from(txt, options)
v *= ::Units.u(from_units)
v.in(norm_units)
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems