Class: Eng::Calc

Inherits:
Object
  • Object
show all
Includes:
Formula, Unit, UnitCalc, Math
Defined in:
lib/eng_calc.rb

Instance Attribute Summary collapse

Attributes included from Unit

#opt

Instance Method Summary collapse

Methods included from Formula

#liner_function, #new_liner_function, #operator_reg, #reverse_operator, #split_by_ari, #split_value_unit

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 Unit

#convert, convert_to_si, find_all, kind_by_si, metric_prefix, si_alter, si_base, si_derived, to_si, to_si_reg, unit_reg, variable, variable_names

Instance Attribute Details

#alter ⇒ Object

Returns the value of attribute alter.


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# File 'lib/eng_calc.rb', line 14

def alter
  @alter
end

#error ⇒ Object

Returns the value of attribute error.


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# File 'lib/eng_calc.rb', line 14

def error
  @error
end

Instance Method Details

#calc(formula) ⇒ Object 


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# File 'lib/eng_calc.rb', line 15

def calc(formula)

  return nil unless formula

  begin
    c = { value: "", unit: [], si_formula: "", error: [] }

    split_value_unit(formula.gsub("⋅","*").gsub("÷","/")).map do |e_formula|
      if e_formula[:unit].nil?
        c[:value] << e_formula[:value].to_f.to_s + "r"
        c[:si_formula] << e_formula[:value]
      elsif e_formula[:value] =~ /#{operator_reg(:ari)}/
        c[:value] << e_formula[:value]
        c[:unit] << e_formula[:value]
        c[:si_formula] << " " + e_formula[:value] + " "
      else
        result = convert(e_formula)
        result[:value].to_f
        c[:value] << result[:value].to_f.rationalize.to_s + "r"
        c[:unit] << result[:unit].unshift("(").push(")")
        c[:error] << result[:error] unless result[:error].nil? || result[:error].empty?
        c[:si_formula] << result[:value].to_s + " " + result[:unit].join
      end
    end
    c_unit = calc_unit(c[:unit].flatten)
    { value: eval(c[:value]).to_f,
      unit: c_unit[:unit],
      error:  (c[:error] << c_unit[:error]).flatten.compact,
      si_formula: c[:si_formula] }

  rescue StandardError, SyntaxError
    { value: "error", unit: "", error: [{ undifined: "undifined formula" }], si_formula: formula}
  end
end

#each_value(value:, si_unit: nil, kind: nil) ⇒ Object 


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# File 'lib/eng_calc.rb', line 50

def each_value(value: , si_unit: nil, kind: nil)
  value = value.to_f.rationalize
  kind = Unit.kind_by_si(si_unit) if si_unit
  return [{kind: false, result: false}] unless kind

  kind.inject([]) do |a,k|
    if Unit.variable[k]
      results = Unit.variable[k].map do |unit|
        { unit: unit[0],
          value: eval(liner_function(unit[1])).to_f }
      end
    else
      results = nil
    end
    a << { kind: k, result: results }
  end
end