Module: Eng::Formula

Included in:
Calc, Unit, Unit, UnitCalc
Defined in:
lib/eng_formula.rb

Instance Method Summary collapse

Instance Method Details

#liner_function(formula) ⇒ Object 



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# File 'lib/eng_formula.rb', line 43

def liner_function(formula)
  formula_arr = formula.split(/(#{operator_reg(:num)})|(value)|(\*)|(\/)|(\+)|(-)/).reject{|v| v == ""}
  input_num = formula_arr.index("value")
  mv_num = formula_arr.index{ |n| n =~ /\*|\// }
  pm_num = formula_arr.index{ |n| n == "+" || n == "-" }

  if mv_num
    a_ari = formula_arr[mv_num]
    if input_num > mv_num
      a = formula_arr[mv_num - 1]
    else
      a = formula_arr[mv_num + 1]
    end
  else
    a_ari = "/"
    a = 1
  end

  if pm_num
    b_ari = formula_arr[pm_num]
    if input_num > pm_num
      b = formula_arr[pm_num - 1]
    else
      b = formula_arr[pm_num + 1]
    end
  else
    b_ari = "+"
    b = 0
  end

  a_ari == "*" ? a_ari = "/" : a_ari = "*"
  b_ari == "+" ? b_ari = "-" : b_ari = "+"

  "value" + a_ari + a.to_s + b_ari + b.to_s + a_ari + a.to_s
end

#operator_reg(kind_operator) ⇒ Object 



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# File 'lib/eng_formula.rb', line 26

def operator_reg(kind_operator)
  case kind_operator
  when :ari
    /(?:[\(\)\+\-\*\/])/
  when :double #２乗表現のマッチング (2^1/2)
    /(?:\^\(?[\+\-]?\d+\/?\d*\)?)/
  when :num
    /\d+(?:\.\d*)?(?:e[+-]?\d+)?/
  when :tri
    /(?:sin|cos|tan)\(.+\)/
  end
end

#split_by_ari(formula) ⇒ Object 



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# File 'lib/eng_formula.rb', line 39

def split_by_ari(formula)
  formula.split((/(#{operator_reg(:ari)})/)).reject(&:empty?)
end

#split_value_unit(formula) ⇒ Object 



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# File 'lib/eng_formula.rb', line 3

def split_value_unit(formula)
  unit_array = []
  formula_pre = formula.to_s.delete(" ")
  formula_pre.scan(/(#{operator_reg(:tri)})|
                  (?:(#{operator_reg(:num)}(?:#{operator_reg(:double)})*)([^#{operator_reg(:num)}#{operator_reg(:double)}#{operator_reg(:ari)}]+\w*))|
                  (?:(#{operator_reg(:num)}(?:#{operator_reg(:double)})*)((?:\/?\(?\/?[a-z]+\d*(?:\*[a-z])*(?:\W*[a-z]\d*\)*)*)(?:\d[^[a-z]])*\)?))|
                  (#{operator_reg(:ari)})|
                  ((?:#{operator_reg(:num)})*(?:#{operator_reg(:double)})?)/ix)
                  .each do |data|
                    unit_array << {
                      value: (data[0] || data[3] || data[5] || data[6] || data[1]),
                      unit: (data[4] || data[5]) || data[2] }
  end

  unit_array.each_with_index do |data, index|
    if data[:unit] =~ /^[^\(]+\)$/
      data[:unit].gsub!(/.$/,'')
      unit_array.insert(index+1, { value: ")", unit: ")" })
    end
  end
  unit_array.delete_if{ |data| true if data[:value].empty? && data[:unit].nil? }
end