Requests_IDNAEncoder::punycode_encode( string $input )
RFC3492-compliant encoder
Parameters
- $input
-
(Required) UTF-8 encoded string to encode
Return
(string) Punycode-encoded string
Source
File: wp-includes/Requests/IDNAEncoder.php
public static function punycode_encode($input) {
$output = '';
# let n = initial_n
$n = self::BOOTSTRAP_INITIAL_N;
# let delta = 0
$delta = 0;
# let bias = initial_bias
$bias = self::BOOTSTRAP_INITIAL_BIAS;
# let h = b = the number of basic code points in the input
$h = $b = 0; // see loop
# copy them to the output in order
$codepoints = self::utf8_to_codepoints($input);
$extended = array();
foreach ($codepoints as $char) {
if ($char < 128) {
// Character is valid ASCII
// TODO: this should also check if it's valid for a URL
$output .= chr($char);
$h++;
}
// Check if the character is non-ASCII, but below initial n
// This never occurs for Punycode, so ignore in coverage
// @codeCoverageIgnoreStart
elseif ($char < $n) {
throw new Requests_Exception('Invalid character', 'idna.character_outside_domain', $char);
}
// @codeCoverageIgnoreEnd
else {
$extended[$char] = true;
}
}
$extended = array_keys($extended);
sort($extended);
$b = $h;
# [copy them] followed by a delimiter if b > 0
if (strlen($output) > 0) {
$output .= '-';
}
# {if the input contains a non-basic code point < n then fail}
# while h < length(input) do begin
while ($h < count($codepoints)) {
# let m = the minimum code point >= n in the input
$m = array_shift($extended);
//printf('next code point to insert is %s' . PHP_EOL, dechex($m));
# let delta = delta + (m - n) * (h + 1), fail on overflow
$delta += ($m - $n) * ($h + 1);
# let n = m
$n = $m;
# for each code point c in the input (in order) do begin
for ($num = 0; $num < count($codepoints); $num++) {
$c = $codepoints[$num];
# if c < n then increment delta, fail on overflow
if ($c < $n) {
$delta++;
}
# if c == n then begin
elseif ($c === $n) {
# let q = delta
$q = $delta;
# for k = base to infinity in steps of base do begin
for ($k = self::BOOTSTRAP_BASE; ; $k += self::BOOTSTRAP_BASE) {
# let t = tmin if k <= bias {+ tmin}, or
# tmax if k >= bias + tmax, or k - bias otherwise
if ($k <= ($bias + self::BOOTSTRAP_TMIN)) {
$t = self::BOOTSTRAP_TMIN;
}
elseif ($k >= ($bias + self::BOOTSTRAP_TMAX)) {
$t = self::BOOTSTRAP_TMAX;
}
else {
$t = $k - $bias;
}
# if q < t then break
if ($q < $t) {
break;
}
# output the code point for digit t + ((q - t) mod (base - t))
$digit = $t + (($q - $t) % (self::BOOTSTRAP_BASE - $t));
$output .= self::digit_to_char($digit);
# let q = (q - t) div (base - t)
$q = floor(($q - $t) / (self::BOOTSTRAP_BASE - $t));
# end
}
# output the code point for digit q
$output .= self::digit_to_char($q);
# let bias = adapt(delta, h + 1, test h equals b?)
$bias = self::adapt($delta, $h + 1, $h === $b);
# let delta = 0
$delta = 0;
# increment h
$h++;
# end
}
# end
}
# increment delta and n
$delta++;
$n++;
# end
}
return $output;
}