Class: Pubid::Core::Transformer

Inherits:
Parslet::Transform
  • Object
show all
Defined in:
lib/pubid/core/transformer.rb

Constant Summary collapse

ROMAN_TO_INT = 
{
  "I" => 1,
  "V" => 5,
  "X" => 10,
  "L" => 50,
  "C" => 100,
  "D" => 500,
  "M" => 1000,
}

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Transformer

Returns a new instance of Transformer.



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# File 'lib/pubid/core/transformer.rb', line 13

def initialize
  super

  rule(amendments: subtree(:amendments)) do |context|
    if context[:amendments].is_a?(Array)
      context[:amendments] = context[:amendments].map do |amendment|
        self.class.get_amendment_class.new(number: amendment[:number], year: amendment[:year])
      end
    else
      context[:amendments] =
        [self.class.get_amendment_class.new(
          number: context[:amendments][:number],
          year: context[:amendments][:year])]

    end
    context
  end

  rule(corrigendums: subtree(:corrigendums)) do |context|
    if context[:corrigendums].is_a?(Array)
      context[:corrigendums] = context[:corrigendums].map do |corrigendum|
        self.class.get_corrigendum_class.new(number: corrigendum[:number], year: corrigendum[:year])
      end
    else
      context[:corrigendums] =
        [self.class.get_corrigendum_class.new(
          number: context[:corrigendums][:number],
          year: context[:corrigendums][:year])]
    end
    context
  end

  rule(roman_numerals: simple(:roman_numerals)) do |context|
    roman_to_int(context[:roman_numerals])
  end
end

Class Method Details

.get_amendment_class ⇒ Object 



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# File 'lib/pubid/core/transformer.rb', line 4

def get_amendment_class
  Amendment
end

.get_corrigendum_class ⇒ Object 



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# File 'lib/pubid/core/transformer.rb', line 8

def get_corrigendum_class
  Corrigendum
end

Instance Method Details

#roman_to_int(roman) ⇒ Object 



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# File 'lib/pubid/core/transformer.rb', line 60

def roman_to_int(roman)
  sum = ROMAN_TO_INT[roman.to_s[0]]
  roman.to_s.chars.each_cons(2) do |c1, c2|
    sum += ROMAN_TO_INT[c2]
    sum -= ROMAN_TO_INT[c1] * 2 if ROMAN_TO_INT[c1] < ROMAN_TO_INT[c2]
  end
  sum
end