Module: Random::Formatter

Included in:
Random, Random
Defined in:
opal/opal/corelib/random/formatter.rb

Instance Method Summary collapse

Instance Method Details

#alphanumeric(count = nil) ⇒ Object 



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# File 'opal/opal/corelib/random/formatter.rb', line 111

def alphanumeric(count = nil)
  count = Random._verify_count(count)
  map = ['0'..'9', 'a'..'z', 'A'..'Z'].map(&:to_a).flatten
  Array.new(count) do |i|
    map[random_number(map.length)]
  end.join
end

#base64(count = nil) ⇒ Object 



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# File 'opal/opal/corelib/random/formatter.rb', line 19

def base64(count = nil)
  Base64.strict_encode64(random_bytes(count)).encode('US-ASCII')
end

#hex(count = nil) ⇒ Object 



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# File 'opal/opal/corelib/random/formatter.rb', line 3

def hex(count = nil)
  count = Random._verify_count(count)
  %x{
    var bytes = #{bytes(count)};
    var out = "";
    for (var i = 0; i < #{count}; i++) {
      out += bytes.charCodeAt(i).toString(16).padStart(2, '0');
    }
    return #{`out`.encode('US-ASCII')};
  }
end

#random_bytes(count = nil) ⇒ Object 



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# File 'opal/opal/corelib/random/formatter.rb', line 15

def random_bytes(count = nil)
  bytes(count)
end

#random_float ⇒ Object

Implemented in terms of #bytes for SecureRandom, but Random overrides this method to implement #bytes in terms of #random_float. Not part of standard Ruby interface - use random_number for portability.



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# File 'opal/opal/corelib/random/formatter.rb', line 39

def random_float
  bs = bytes(4)
  num = 0
  4.times do |i|
    num <<= 8
    num |= bs[i].ord
  end
  num.abs / 0x7fffffff
end

#random_number(limit = undefined) ⇒ Object 



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# File 'opal/opal/corelib/random/formatter.rb', line 49

def random_number(limit = undefined)
  %x{
    function randomFloat() {
      return #{random_float};
    }

    function randomInt(max) {
      return Math.floor(randomFloat() * max);
    }

    function randomRange() {
      var min = limit.begin,
          max = limit.end;

      if (min === nil || max === nil) {
        return nil;
      }

      var length = max - min;

      if (length < 0) {
        return nil;
      }

      if (length === 0) {
        return min;
      }

      if (max % 1 === 0 && min % 1 === 0 && !limit.excl) {
        length++;
      }

      return randomInt(length) + min;
    }

    if (limit == null) {
      return randomFloat();
    } else if (limit.$$is_range) {
      return randomRange();
    } else if (limit.$$is_number) {
      if (limit <= 0) {
        #{raise ArgumentError, "invalid argument - #{limit}"}
      }

      if (limit % 1 === 0) {
        // integer
        return randomInt(limit);
      } else {
        return randomFloat() * limit;
      }
    } else {
      limit = #{Opal.coerce_to!(limit, Integer, :to_int)};

      if (limit <= 0) {
        #{raise ArgumentError, "invalid argument - #{limit}"}
      }

      return randomInt(limit);
    }
  }
end

#urlsafe_base64(count = nil, padding = false) ⇒ Object 



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# File 'opal/opal/corelib/random/formatter.rb', line 23

def urlsafe_base64(count = nil, padding = false)
  Base64.urlsafe_encode64(random_bytes(count), padding).encode('US-ASCII')
end

#uuid ⇒ Object 



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# File 'opal/opal/corelib/random/formatter.rb', line 27

def uuid
  str = hex(16).split('')
  str[12] = '4'
  str[16] = `(parseInt(#{str[16]}, 16) & 3 | 8).toString(16)`
  str = [str[0...8], str[8...12], str[12...16], str[16...20], str[20...32]]
  str = str.map(&:join)
  str.join('-')
end