require 'rockit/rockit'

def parse_size(size)
    unit_pattern = '(([kmµucMG]?([glLJm]|mol|Bq)\b)(\/([mµu]?[glL])\b)?)|((Mio\s)?U\.?I\.?)|(%( [mV]\/[mV])?)|(I\.E\.)|(Fl\.)'
    numeric_pattern = '\d+(\'\d+)*([.,]\d+)?'
    iso_pattern = "[[:alpha:]()\-]+"
    @parser = Parse.generate_parser <<-EOG
Grammar OddbSize
  Tokens
    DESCRIPTION = /(?!#{unit_pattern}\s)#{iso_pattern}(\s+#{iso_pattern})*/u
    NUMERIC     = /#{numeric_pattern}/u
    SPACE       = /\s+/u [:Skip]
    UNIT        = /#{unit_pattern}/u
  Productions
    Size      ->  Multiple* Addition? Count? Measure? Scale? Dose? DESCRIPTION?
    Count     ->  'je'? NUMERIC
    Multiple  ->  NUMERIC UNIT? /[xXà]|Set/u
    Measure   ->  NUMERIC UNIT UNIT?
    Addition  ->  NUMERIC UNIT? '+'
    Scale     ->  '/' NUMERIC? UNIT
    Dose      ->  '(' NUMERIC UNIT ')'
    EOG
    
    multi, addition, count, measure, scale, dose, comform = nil
    begin
    multi, addition, count, measure, scale, dose, comform = @parser.parse(size).flatten
    rescue ParseException, AmbigousParseException => e
      count = size.to_i
    end
    [multi, addition, count, measure, scale, dose, comform]
end

p parse_size('200 ml')