number_parser.rb

number_parser.rb
¶
```
module BankOcr
  class NumberParser
```

The NumberParser abstraction uses a map of string characters to string integers to find out if a given 9 characters string has a valid equivalent.

    NUMBERS = {
      ' _ ' \
      '| |' \
      '|_|' => '0',
      '   ' \
      '  |' \
      '  |' => '1',
      ' _ ' \
      ' _|' \
      '|_ ' => '2',
      ' _ ' \
      ' _|' \
      ' _|' => '3',
      '   ' \
      '|_|' \
      '  |' => '4',
      ' _ ' \
      '|_ ' \
      ' _|' => '5',
      ' _ ' \
      '|_ ' \
      '|_|' => '6',
      ' _ ' \
      '  |' \
      '  |' => '7',
      ' _ ' \
      '|_|' \
      '|_|' => '8',
      ' _ ' \
      '|_|' \
      ' _|' => '9'
    }

    attr_accessor :original

    def initialize
      @original = ''
    end

The idea is to simply add strings in a variable

    def <<(number_section)
      @original << number_section
    end

and then just look for it on a hash

    def parse
      NUMBERS.fetch(@original, '?')
    end
  end
end