Method: Addressable::IDNA.punycode_encode

Defined in:: lib/addressable/idna/pure.rb,
lib/addressable/idna/native.rb
.punycode_encode(value) ⇒ `Object`

# File 'lib/addressable/idna/pure.rb', line 4428

def self.punycode_encode(unicode)
  unicode = unicode.to_s unless unicode.is_a?(String)
  input = unicode.unpack("U*")
  output = [0] * (ACE_MAX_LENGTH + 1)
  input_length = input.size
  output_length = [ACE_MAX_LENGTH]

  # Initialize the state
  n = PUNYCODE_INITIAL_N
  delta = out = 0
  max_out = output_length[0]
  bias = PUNYCODE_INITIAL_BIAS

  # Handle the basic code points:
  input_length.times do |j|
    if punycode_basic?(input[j])
      if max_out - out < 2
        raise PunycodeBigOutput,
          "Output would exceed the space provided."
      end
      output[out] = input[j]
      out += 1
    end
  end

  h = b = out

  # h is the number of code points that have been handled, b is the
  # number of basic code points, and out is the number of characters
  # that have been output.

  if b > 0
    output[out] = PUNYCODE_DELIMITER
    out += 1
  end

  # Main encoding loop:

  while h < input_length
    # All non-basic code points < n have been
    # handled already.  Find the next larger one:

    m = PUNYCODE_MAXINT
    input_length.times do |j|
      m = input[j] if (n...m) === input[j]
    end

    # Increase delta enough to advance the decoder's
    # <n,i> state to <m,0>, but guard against overflow:

    if m - n > (PUNYCODE_MAXINT - delta) / (h + 1)
      raise PunycodeOverflow, "Input needs wider integers to process."
    end
    delta += (m - n) * (h + 1)
    n = m

    input_length.times do |j|
      # Punycode does not need to check whether input[j] is basic:
      if input[j] < n
        delta += 1
        if delta == 0
          raise PunycodeOverflow,
            "Input needs wider integers to process."
        end
      end

      if input[j] == n
        # Represent delta as a generalized variable-length integer:

        q = delta; k = PUNYCODE_BASE
        while true
          if out >= max_out
            raise PunycodeBigOutput,
              "Output would exceed the space provided."
          end
          t = (
            if k <= bias
              PUNYCODE_TMIN
            elsif k >= bias + PUNYCODE_TMAX
              PUNYCODE_TMAX
            else
              k - bias
            end
          )
          break if q < t
          output[out] =
            punycode_encode_digit(t + (q - t) % (PUNYCODE_BASE - t))
          out += 1
          q = (q - t) / (PUNYCODE_BASE - t)
          k += PUNYCODE_BASE
        end

        output[out] = punycode_encode_digit(q)
        out += 1
        bias = punycode_adapt(delta, h + 1, h == b)
        delta = 0
        h += 1
      end
    end

    delta += 1
    n += 1
  end

  output_length[0] = out

  outlen = out
  outlen.times do |j|
    c = output[j]
    unless c >= 0 && c <= 127
      raise StandardError, "Invalid output char."
    end
    unless PUNYCODE_PRINT_ASCII[c]
      raise PunycodeBadInput, "Input is invalid."
    end
  end

  output[0..outlen].map { |x| x.chr }.join("").sub(/\0+\z/, "")
end
Method: Addressable::IDNA.punycode_encode

.punycode_encode(value) ⇒ Object

.punycode_encode(value) ⇒ `Object`
