Class: Engineer::Calculator

Inherits:
Object
  • Object
show all
Includes:
Math
Defined in:
lib/engineer_calculator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Calculator

Returns a new instance of Calculator.



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# File 'lib/engineer_calculator.rb', line 8

def initialize
  @error = {}
  @opt = nil
end

Instance Attribute Details

#alter ⇒ Object

Returns the value of attribute alter.



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# File 'lib/engineer_calculator.rb', line 7

def alter
  @alter
end

#error ⇒ Object

Returns the value of attribute error.



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# File 'lib/engineer_calculator.rb', line 7

def error
  @error
end

Instance Method Details

#calc(formula) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 13

def calc(formula)
  return nil unless formula
  @error = {}
  @result = {}
  @alter = nil
  begin
    formula = split_unit(formula.gsub("⋅","*")).compact
    formula.map! do |each_formula|
      if each_formula[:unit].nil?
        [each_formula[:value], []]
      elsif each_formula[:value] =~ /#{reg(:ari)}/
        [each_formula[:value], [each_formula[:value]]]
      else
        each_formula[:unit]
        convert_value = convert(each_formula[:unit])
        [sprintf("%.05g", each_formula[:value].to_f * convert_value[0].to_f), convert_value[1].unshift("(").push(")")]
      end
    end
    value = String.new
    units = []
    formula.each do |x|
      value << x[0].to_s.sub("^","**") + (x[0].to_s =~ Regexp.union(reg(:ari),/(?:#{reg(:num)})*(?:#{reg(:double)})+/) ? "" : ".rationalize") unless x[0].empty?
      units << x[1]
    end
    p units
    @opt = nil
    converted_formula = formula.inject(String.new){ |f, v| f << v[0].to_s + (v[0] != v[1].join ? v[1].join : " ") }
    return @result = { value: eval(value).to_f, unit: units.flatten.join, convert_formula: converted_formula } unless @error[:unit_not_found].nil?
    @result = { value: sprintf("%.05g", eval(value).to_f), unit: calc_unit(units.flatten), convert_formula: converted_formula }
    @alter = search_unit(@result)
    @result
  rescue StandardError, SyntaxError
     @error[:inapprehensible] = "Sorry, we could not calculate"
     nil
  end
end

#calc_unit(units) ⇒ Object

配列で単位を受け取る。



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# File 'lib/engineer_calculator.rb', line 95

def calc_unit(units) #配列で単位を受け取る。
  par = parenthesis_unit(units)
  par.reverse_each do |index|
    by_value = units[index[0]..index[1]]
    unit = plus_minus_split(by_value)
    unit.map! do |each_unit|
      multi_div_unit each_unit
    end
    unit = plus_minus_unit(unit)
    add = by_value.include?("(") ? 1 : 0
    units[(index[0]+add)..(index[1]-add)] = unit + Array.new(units[(index[0]+add)..(index[1]-add)].size-unit.size)
  end
  units.compact!
  units.reject!{ |x| x =~ /\(|\)/ }
  unit_arrange units
end

#convert(units) ⇒ Object 



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

def convert(units)
  unit = {value: String.new, unit: []}
  convert_unit = try_split_each_unit(units).map { |unit|
    return [1, [units]] unless @error[:unit_not_found].nil?
    convert_to_si_unit(unit)
  }.map do |c_value, c_unit, c_type|
    if c_type
      unit[:value] << c_unit
      unit[:unit] << c_unit
    else
      unit[:value] << "(" + c_value.to_s + "*"
      si_unit = split_si_unit(c_unit)
      unit[:value] << si_unit[0].to_s + ")"
      unit[:unit] << si_unit[1]
    end
  end
  [eval(unit[:value].gsub(/\)\(/,")*(")), unit[:unit].flatten]
end

#convert_metric(metric) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 244

def convert_metric(metric)
  metric_prefix_unit[metric]
end

#convert_metric_weight(weight_metric) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 248

def convert_metric_weight(weight_metric)
  convert_metric(weight_metric).to_f / convert_metric("k").to_f
end

#convert_to_si_unit(kind_of_unit) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 252

def convert_to_si_unit(kind_of_unit)
  if kind_of_unit[:alter]
    unit = kind_of_unit[:alter]
    alter_unit = {}
    unit.match(/(?<metric>#{reg(:metric)})?(?<alter>#{reg(:alter)})/) do |si_unit|
      alter_unit[:metric] = si_unit[:metric] ? metric_prefix_unit.each { |m_unit, value| break m_unit if si_unit[:metric].upcase == m_unit.upcase } : nil
      alter_unit[:alter] = @opt ? si_alter_unit.each { |kind, a_unit| break a_unit[0] if si_unit[:alter].upcase == a_unit[0].upcase } : si_unit[:alter]
    end
    si_alter_unit.each do |key, value|
      return [convert_metric(alter_unit[:metric]) || 1, si_base_unit.merge(si_derived_unit)[key]] if value.include?(alter_unit[:alter])
    end
  elsif kind_of_unit[:variable]
    unit = kind_of_unit[:variable]
    variable_unit.each do |kind, v_unit|
      return [1.0/v_unit[unit].to_f, si_base_unit.merge(si_derived_unit)[kind]] if v_unit.key?(unit)
      v_unit.each do |v_unit_name, value|
        return [1.0/value.to_f, si_base_unit.merge(si_derived_unit)[kind]] if v_unit_name.upcase == unit.upcase
      end
    end
  elsif kind_of_unit[:ari]
    [kind_of_unit[:ari], kind_of_unit[:ari], :ari]
  else
    [1, kind_of_unit[:base]]
  end
end

#extraction_metric(si_unit) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 226

def extraction_metric(si_unit)
  unit = {}
  si_unit.upcase! if @opt
  si_unit.match(/(?<metric>#{reg(:metric)})?(?<base>(#{reg(:base)}|g){1})(?<numeric>-*\d)*/) do |sp_unit|
    unit[:original] = sp_unit[0]
    unit[:metric] = @opt && sp_unit[:metric] ? metric_prefix_unit.each_key { |metric| break metric if sp_unit[:metric].upcase == metric.upcase } : sp_unit[:metric]
    unit[:base] = @opt ? si_base_unit.each_value { |b_unit| break b_unit if b_unit.upcase == sp_unit[:base].upcase } : sp_unit[:base]
    unit[:numeric] = sp_unit[:numeric] || 1
  end
  metric = if unit[:base] == "g"
    unit_base = "kg"
    convert_metric_weight(unit[:metric])
  else
    unit[:metric] ? convert_metric(unit[:metric]).to_f**(unit[:numeric].to_f || 1) : 1
  end
  [metric.to_f, unit_base || unit[:base] + ( unit[:numeric] != 1 ? unit[:numeric].to_s : "" )]
end

#metric_prefix_unit ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 305

def metric_prefix_unit
  @metric_prefix ||= YAML.load_file(File.join(__dir__, 'unit/metric_prefix.yml'))
end

#multi_div_unit(units) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 166

def multi_div_unit(units)
  unit_hash = Hash.new(0)
  ari = "+"
  end_par = "+"
  units.compact! unless units.nil?
  units.each do |unit|
    case unit
    when "*", "・", "⋅"
      ari = "+" unless end_par == "-"
    when "/"
      ari = "-"
    when "("
      end_par = "-" if ari == "-"
    when ")"
      end_par = "+"
    else
      num = unit.match(/(?<base>#{reg(:base)}){1}(?<num>-*\d*)/)
      base = num[:base]
      num = num[:num].empty? ? 1 : num[:num]
      unit_hash[base] = eval(unit_hash[base].to_s + ari + num.to_s)
      ari = "+" unless end_par == "-"
    end
  end
  unit_hash.sort{|a,b| b[1] <=> a[1]}.map { |key, value| value == 0 ? nil : key + value.to_s}.compact
end

#parenthesis_unit(formula) ⇒ Object

formulaは配列で入ってくる。



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# File 'lib/engineer_calculator.rb', line 192

def parenthesis_unit(formula) #formulaは配列で入ってくる。["m","/","s"]
  array = []
  count = []
  formula.each_with_index do |value, index|
    case value
    when "("
      array.push [index, nil]
      count << array.size - 1
    when ")"
      array[count.pop][1] = index
    end
  end
  array.unshift([0,formula.size-1])
end

#plus_minus_split(units) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 153

def plus_minus_split(units)
  if units.any?{|x| x=="+" || x=="-"}
    num = [0]
    array = []
    units.each_with_index { |x, i| num << i if x == "+" || x == "-" }
    num << units.size - 1
    num.each_with_index { |x, i| array << units[num[i-1]..x].reject!{|x| ["+", "-"].include?(x) } unless i==0 }
    array
  else
    [units]
  end
end

#plus_minus_unit(array) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 143

def plus_minus_unit(array)
  array.each_with_index do |value, i|
    unless i == 0 || (array[i-1].sort == array[i].sort)
      @error[:plus_minus] ||= ["is different unit./ 足し算の単位が違います。"]
      @error[:plus_minus].unshift "#{unit_arrange(array[i-1])} + #{unit_arrange(array[i])}"
    end
  end
  array[0]
end

#reg(kind_of_unit) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 313

def reg(kind_of_unit)
  case kind_of_unit
  when :ari
    /(?:[\(\)\+\-\*\/])/
  when :double
    /(?:\^\(?[\+\-]?\d+\/?\d*\)?)/
  when :num
    /\d+(?:\.\d*)?(?:e[+-]?\d+)?/
  when :tri
    /(?:sin|cos|tan)\(.+\)/
  else
    hash_name = self.methods.grep(/.*#{kind_of_unit.to_s}.*(_unit)$/).first.to_s
    unit_hash = if hash_name.include?("variable")
        hash = {}
        send(hash_name).values.each{|x| hash.merge!(x)}.flatten
        hash
      else
        send hash_name
      end
    keys_or_values = hash_name.to_s.include?("si") ? :values : :keys

    Regexp.new("#{unit_hash.send(keys_or_values).flatten.sort{|a,b| b.size <=> a.size}.map{|x| "|#{send_method(Regexp.escape(x), @opt)}"}.join}".gsub(/^\|/,""))
  end
end

#search_unit(value:, unit:, convert_formula: nil) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 131

def search_unit(value:, unit:, convert_formula: nil)
  compare_unit = multi_div_unit(split_si_unit(unit)[1]).sort
  all_unit = {si_unit: [], variable: []}
  si_base_unit.merge(si_derived_unit).delete_if { |type, e_unit|
    compare_unit != multi_div_unit(split_si_unit(e_unit)[1]).sort
  }.each do |unit_name, e_unit|
    all_unit[:si_unit] << [unit_name, si_alter_unit[unit_name] ? si_alter_unit[unit_name].join(" : ") : nil ]
    all_unit[:variable] << [unit_name, variable_unit[unit_name] ? variable_unit[unit_name].map { |v_unit, v_value| [v_unit, value.to_f * v_value.to_f] } : nil]
  end
  all_unit
end

#send_method(str, method = nil) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 91

def send_method(str, method=nil)
  method ? str.send(method) : str
end

#si_alter_unit ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 309

def si_alter_unit
  @si_alter_unit ||= YAML.load_file(File.join(__dir__, 'unit/si_alter_unit.yml'))
end

#si_base_unit ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 293

def si_base_unit
  @si_base_unit ||= YAML.load_file(File.join(__dir__, '/unit/si_base_unit.yml'))
end

#si_derived_unit ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 297

def si_derived_unit
  @si_derived_unit ||= YAML.load_file(File.join(__dir__, 'unit/si_derived_unit.yml'))
end

#split_si_unit(si_unit) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 207

def split_si_unit(si_unit)
  unit = si_unit.split(/([\*\/\(\)])/).reject(&:empty?).map do |s_unit|
    s_unit =~ /([\*\/\(\)])/ ? s_unit : extraction_metric(s_unit)
  end
  value = String.new
  unit_si = []
  unit.each do |each_unit|
    case each_unit
    when Array
      value << each_unit[0].to_s
      unit_si << each_unit[1]
    when String
      value << each_unit.to_s
      unit_si << each_unit
    end
  end
  [eval(value.gsub(/^(#{reg(:ari)})/,"")), unit_si]
end

#split_unit(formula) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 278

def split_unit(formula)
  unit_array = []
  formula_pre = formula.to_s.delete(" ")
  formula_pre.scan(/(#{reg(:tri)})|(?:(#{reg(:num)}(?:#{reg(:double)})*)((?:\/?\(?\/?[a-z]+\d*(?:\*[a-z])*(?:\W*[a-z]\d*\)*)*)(?:-*\d[^[a-z]])*\)?))|(#{reg(:ari)})|((?:#{reg(:num)})*(?:#{reg(:double)})?)/i).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
end

#try_split_each_unit(units) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 69

def try_split_each_unit(units)
  type = [:base, :alter, :variable, :base, :ari]
  try_method = [
    {reg: proc {/#{unit_reg}/}, case: @opt=nil, type: nil},
    {reg: proc {/#{unit_reg}/}, case: @opt=:upcase, type: nil},
    {reg: proc {/(#{reg(:variable)})/}, case: @opt=:upcase, type: :variable},
  ]
  try_method.each do |try|
    unit = []
    @opt = try[:case]
    app_unit = send_method(units, @opt).scan(try[:reg].call).map do |e_unit|
      e_unit.each_with_index { |a_unit,i| unit.push({(try[:type] || type[i]) => a_unit}) if a_unit }
    end
    next unless app_unit.join == send_method(units, @opt)
    @error[:capitalize] = "upper/lower case shall be follows / 大文字、小文字は使い分けてください" if @opt
    return unit
  end
  @error[:unit_not_found] ||= [" could not be found"]
  @error[:unit_not_found].unshift(units)
  {unit_not_found: units}
end

#unit_arrange(units) ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 112

def unit_arrange(units)
  pos = []
  neg = []
  units.each do |unit|
    num = unit.match(/(?<base>#{reg(:base)}){1}(?<num>-*\d*)/)
    unless num.nil?
      if num[:num].nil? || num[:num].to_i.positive?
        number = num[:num].to_i == 1 ? nil : num[:num]
        pos << num[:base] + number.to_s
      else
        number = num[:num].to_i == -1 ? nil : - (num[:num].to_i)
        neg << num[:base] + number.to_s
      end
    end
  end
  div = neg.size > 1 ? ("/" + "(" + neg.join("*") + ")") : (neg.empty? ? nil : "/" + neg.join.to_s)
  pos.join("*") + div.to_s
end

#unit_reg ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 338

def unit_reg
  /(#{reg(:derived)})|((?:#{reg(:metric)})?#{reg(:alter)})|(#{reg(:variable)})|((?:#{reg(:metric)})?(?:#{reg(:base)}|g){1}-*\d*)|(#{reg(:ari)})/
end

#variable_unit ⇒ Object 



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# File 'lib/engineer_calculator.rb', line 301

def variable_unit
  @variable_unit ||= YAML.load_file(File.join(__dir__, 'unit/variable_unit.yml'))
end