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 42

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

#new_liner_function(formula) ⇒ Object 



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# File 'lib/eng_formula.rb', line 78

def new_liner_function(formula)
  fl_arr = formula.split(/(\*|\/|\+|-)/)
  value_i = fl_arr.index("value")

  a = []
  b = []
  pl = false
  (value_i .. fl_arr.size - 1).each do |i|
    if pl || fl_arr[i] == "+" || fl_arr[i] == "-"
      b << reverse_operator(fl_arr[i])
      pl = true
    else
      a << reverse_operator(fl_arr[i])
    end
  end

  if value_i != 0
    (0 .. value_i - 1).reverse_each do |i|
      if fl_arr[i] == "+" || fl_arr[i] == "-" || i == 0
        (i .. value_i - 1).reverse_each do |ii|
          a.unshift(reverse_operator(fl_arr[ii]))
        end

        if i != 0
          (0..i).each do |ii|
            b.unshift(reverse_operator(fl_arr[ii], false))
          end
        end
        break
      end
    end
  end
  a.join + "+(" + b.join + ")/value"
end

#operator_reg(kind_operator) ⇒ Object 



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# File 'lib/eng_formula.rb', line 25

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

#reverse_operator(operator, opt = true) ⇒ Object 



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# File 'lib/eng_formula.rb', line 113

def reverse_operator(operator, opt = true)
  case operator
  when "+"
    "-"
  when "-"
    "+"
  when "*"
    opt ? "/" : "*"
  when "/"
    opt ? "*" : "/"
  else
    operator
  end
end

#split_by_ari(formula) ⇒ Object 



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# File 'lib/eng_formula.rb', line 38

def split_by_ari(formula)
  formula.split((/(#{operator_reg(:ari)})/))
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)})*)((?:\/?\(?\/?[a-z]+\d*(?:\*[a-z])*(?:\W*[a-z]\d*\)*)*)(?:\d[^[a-z]])*\)?))|
                  (#{operator_reg(:ari)})|
                  ((?:#{operator_reg(:num)})*(?:#{operator_reg(:double)})?)/ix)
                  .each do |data|
                    unit_array << {
                      value: (data[0] || data[1] || data[3] || data[4]),
                      unit: (data[2] || data[3]) }
  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