func encode()

in pkg/cookiejar/punycode.go [34:98]

• 65 lines of code
• 17 McCabe index (conditional complexity)

func encode(prefix, s string) (string, error) {
	output := make([]byte, len(prefix), len(prefix)+1+2*len(s))
	copy(output, prefix)
	delta, n, bias := int32(0), initialN, initialBias
	b, remaining := int32(0), int32(0)
	for _, r := range s {
		if r < utf8.RuneSelf {
			b++
			output = append(output, byte(r))
		} else {
			remaining++
		}
	}
	h := b
	if b > 0 {
		output = append(output, '-')
	}
	for remaining != 0 {
		m := int32(0x7fffffff)
		for _, r := range s {
			if m > r && r >= n {
				m = r
			}
		}
		delta += (m - n) * (h + 1)
		if delta < 0 {
			return "", fmt.Errorf("cookiejar: invalid label %q", s)
		}
		n = m
		for _, r := range s {
			if r < n {
				delta++
				if delta < 0 {
					return "", fmt.Errorf("cookiejar: invalid label %q", s)
				}
				continue
			}
			if r > n {
				continue
			}
			q := delta
			for k := base; ; k += base {
				t := k - bias
				if t < tmin {
					t = tmin
				} else if t > tmax {
					t = tmax
				}
				if q < t {
					break
				}
				output = append(output, encodeDigit(t+(q-t)%(base-t)))
				q = (q - t) / (base - t)
			}
			output = append(output, encodeDigit(q))
			bias = adapt(delta, h+1, h == b)
			delta = 0
			h++
			remaining--
		}
		delta++
		n++
	}
	return string(output), nil
}