Module: Eng::Unit

Extended by:
Formula, UnitCalc
Includes:
Formula
Included in:
Calc
Defined in:
lib/eng_unit.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from UnitCalc

calc_unit, multi_div_unit, parenthesis_unit, plus_minus_split, plus_minus_unit, split_si_unit, unit_arrange

Methods included from Formula

liner_function, new_liner_function, operator_reg, reverse_operator, split_by_ari, split_value_unit

Instance Attribute Details

#opt ⇒ Object

Returns the value of attribute opt.


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# File 'lib/eng_unit.rb', line 57

def opt
  @opt
end

Class Method Details

.convert_to_si(value:, unit:, opt: nil) ⇒ Object 


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# File 'lib/eng_unit.rb', line 130

def convert_to_si(value: , unit: , opt: nil)
  value = value.rationalize
  metric = nil
  num = 1
  @opt = opt
  original_unit = unit
  unit = unit.send(opt)
  if unit.match(to_si_reg) do |si_unit|
      break if si_unit[0] != unit || si_unit[0].upcase == "KG"
      metric = si_unit[:metric]
      unit = si_unit[:si] + (si_unit[:num] || "")
      num = si_unit[:num] || 1
    end
  end
  result = find_all(unit)

  if !result && !opt
    convert_to_si(value: value, unit: unit, opt: :upcase)
  elsif result
    @opt = nil
    metric = metric ? (metric_prefix[original_unit[0]].to_f ** num.to_f).rationalize : 1
    {
      value: eval(result[:formula].to_s + "*#{metric}").to_f,
      unit: to_si(result[:kind]),
      kind: result[:kind],
      error: opt ? { unit_upcase: original_unit } : nil
    }
  else
    {
      value: value,
      unit: original_unit,
      kind: nil,
      error: original_unit.empty? ? nil : { unit_not_found: original_unit }
    }
  end
end

.find_all(unit) ⇒ Object 


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# File 'lib/eng_unit.rb', line 122

def find_all(unit)
  [:si_base, :si_alter, :si_derived, :variable].each do |method|
    result = Unit.send(method).to_find(unit)
    return result if result
  end
  nil
end

.kind_by_si(unit) ⇒ Object 


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# File 'lib/eng_unit.rb', line 167

def kind_by_si(unit)
  s_unit = unit_arrange(multi_div_unit(split_by_ari(unit)))
  a = []
  si_base.merge(si_derived).each do |e_unit|
    a << e_unit[0] if s_unit == unit_arrange(multi_div_unit(split_by_ari(e_unit[1])))
  end
  a || false
end

.metric_prefix ⇒ Object 


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# File 'lib/eng_unit.rb', line 110

def metric_prefix
  @metric_prefix ||= YAML.load_file(File.join(__dir__, 'unit_calc/metric_prefix.yml'))
  return @metric_prefix.inject({}){ |h, (k,v)| h[k.upcase] = v; h } if @opt
  @metric_prefix
end

.si_alter ⇒ Object 


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# File 'lib/eng_unit.rb', line 116

def si_alter
  @si_alter_unit ||= YAML.load_file(File.join(__dir__, 'unit_calc/si_alter_unit.yml'))
  return @si_alter_unit.inject({}){ |h, (k,v)| h[k] = v.inject([]){ |a, aa| a << aa.upcase; a }; h } if @opt
  @si_alter_unit
end

.si_base ⇒ Object 


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# File 'lib/eng_unit.rb', line 92

def si_base
  @si_base_unit ||= YAML.load_file(File.join(__dir__, 'unit_calc/si_base_unit.yml'))
  return @si_base_unit.inject({}){ |h, (k,v)| h[k] = v.upcase; h } if @opt
  @si_base_unit
end

.si_derived ⇒ Object 


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# File 'lib/eng_unit.rb', line 98

def si_derived
  @si_derived_unit ||= YAML.load_file(File.join(__dir__, 'unit_calc/si_derived_unit.yml'))
  return @si_derived_unit.inject({}){ |h, (k,v)| h[k] = v.upcase; h } if @opt
  @si_derived_unit
end

.to_si(kind_unit) ⇒ Object 


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# File 'lib/eng_unit.rb', line 176

def to_si(kind_unit)
  si_base[kind_unit] || si_derived[kind_unit]
end

.to_si_reg ⇒ Object 


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# File 'lib/eng_unit.rb', line 180

def to_si_reg
  /((?<metric>#{metric_prefix.to_reg})(?<si>#{si_base.to_reg}|g){1}(?<num>-*\d)*)|((?<metric>#{metric_prefix.to_reg})(?<si>#{si_alter.to_reg}))/
end

.unit_reg ⇒ Object 


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# File 'lib/eng_unit.rb', line 184

def unit_reg
  /(#{si_derived.to_reg})|((?:#{metric_prefix.to_reg})?#{si_alter.to_reg})|(#{variable.to_reg})|((?:#{metric_prefix.to_reg})?(?:#{si_base.to_reg}|g){1}-*\d*)|(#{operator_reg(:ari)})/
end

.variable ⇒ Object 


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# File 'lib/eng_unit.rb', line 104

def variable
  @variable_unit ||= YAML.load_file(File.join(__dir__, 'unit_calc/variable_unit.yml'))
  return @variable_unit.inject({}){ |h, (k,v)| h[k] = v.inject({}){ |hh, (kk, vv)| hh[kk.upcase] = vv; hh }; h } if @opt
  @variable_unit
end

.variable_names ⇒ Object 


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# File 'lib/eng_unit.rb', line 188

def variable_names
  variable.inject({}) do |a, k|
    a[k[0]] = k[1].keys.join(", ").split(", ")
    a
  end
end

Instance Method Details

#convert(value:, unit:) ⇒ Object 


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# File 'lib/eng_unit.rb', line 59

def convert(value: , unit: )
  values = nil
  first_unit = false
  convert_unit = unit.split(/(\*|\/)/).map do |e_unit|
    if e_unit.empty?
    elsif e_unit =~ /(\*|\/)/
      values = e_unit
      if e_unit == "/" && !first_unit
        values = value.to_s + "/"
        first_unit = true
      end
      { value: values, unit: e_unit }
    else
      values = first_unit ? 1 : value
      first_unit = true
      Unit.convert_to_si(value: values.to_f.rationalize, unit: e_unit)
    end
  end
  results = convert_unit.compact.inject({ value: "", unit: [], error: [] }) do |result, convert|
    result[:value] << convert[:value].to_s
    result[:unit]  << split_by_ari(convert[:unit]) if convert[:unit]
    result[:error] << convert[:error] if convert[:error]
    result
  end
  results[:value] = eval(results[:value] << "")
  results[:unit].flatten!.reject!(&:empty?)
  results
end